CN1390372A - Antenna device and method for transmitting and receiving radio wares - Google Patents
Antenna device and method for transmitting and receiving radio wares Download PDFInfo
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- CN1390372A CN1390372A CN00815226A CN00815226A CN1390372A CN 1390372 A CN1390372 A CN 1390372A CN 00815226 A CN00815226 A CN 00815226A CN 00815226 A CN00815226 A CN 00815226A CN 1390372 A CN1390372 A CN 1390372A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
- H01Q3/247—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching by switching different parts of a primary active element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/06—Details
- H01Q9/14—Length of element or elements adjustable
- H01Q9/145—Length of element or elements adjustable by varying the electrical length
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Transceivers (AREA)
- Radio Relay Systems (AREA)
- Radio Transmission System (AREA)
Abstract
The present invention comprises an antenna device (1) for transmitting and receiving radio waves, connectable to a radio communication device, and comprising transmitter (2) and receiver (3) sections. The receiver section includes a receiving antenna structure (13, 35, 61, 82-85, 87, 89, 91, 92) switchable between a plurality of antenna configuration states, each of which is distinguished by a set of radiation related parameters, such as resonance frequency, impedance, radiation pattern, polarization and bandwidth, and a switching device (14, 36, 81) for selectively switching said antenna structure between said plurality of antenna configuration states. The antenna device comprises further a receiving means for receiving a first measure representing the reflection coefficient in the transmitter section, and a control device (22) for controlling the switching device of said receiver section, and thus the selective switching of the antenna structure between said plurality of antenna configuration states, in dependence on said first received measure representing the reflection coefficient.
Description
Invention field
The present invention relates generally to field of antenna and relate separately to a kind of be used to the transmit and receive antenna equipment of radio wave, a kind of radio communication equipment and a kind of method that is used to transmit and receive radio wave that comprises described antenna equipment particularly.
Background of invention
In modern radio communication industry, exist the eternal ever-increasing demand of less and more multiduty portable terminal such as hand portable phone.Its performance of size decision of antenna is known, referring to the Antenna EngineeringHandbook (antenna works handbook) (McGrawHill 1993, the 6 chapters) of Johnsson.To become than more important in the past at antenna, phone body with such as the interaction between user's the environment adjacent itself.Because recently, the demand that two or more frequency bands are provided is arranged usually.Therefore, be manufactured on this type of the small-sized and multiduty terminal that represents good antenna performance under the various situations and become a difficult task.
When making a hand portable phone now, antenna is generally suitable for the characteristic of this concrete phone of and is suitable for default use in default environment.This means that this antenna can not be used for using any particular condition of a certain phone subsequently or be fit to different hand portable phone.Therefore, each model of hand portable phone all must be equipped with the antenna of a particular design, and it can not at random be used in any other phone model in general.
The radiative property of the antenna equipment of small scale structures, hand-hold wireless electrical communication equipment for example depends on the shape and size of supporting structure of the printed circuit board (PCB) (PCB) and so on of all equipment as described and shell to a great extent.All radiative properties such as resonance frequency, input impedance, bandwidth, radiation mode, gain, polarization and near field pattern are results of interaction of antenna equipment itself and it and PCB and shell.Therefore, all references that below radiative property is carried out is to mean antenna to be bonded to wherein entire equipment.
Referred in the above other radio communication equipment with respect to such as cordless telephone, telemetry system, wireless data terminal or the like also is correct.Therefore, antenna equipment of the present invention can be applicable in the various communication equipments on a very wide scale.
By for example EP-A2-0,852,407, GB-A-2,332,124 and JP-A-10,145,130 can understand the have diversity feature reception antenna of (therefore finishing the adaptation to various wireless radio wave environment).Such diversity feature system can be used to suppress noise, and/or such as inhibit signal, may cause the undesirable signal and the co-channel interference signal of intersymbol interference, therefore and improved total signal quality, but need a complicated receiver circuit structure that comprises a plurality of receiver links, and a plurality of antenna input port.
Switchable antenna for example from the works that is used for obtaining diversity as can be known.
WO 99/44307 discloses a kind of communication equipment with antenna gain diversity.This device comprises first and second antenna elements, in them both or only one of them can be coupled to the aerial signal node.The antenna element that is not coupled to this node is electrically coupled to signal ground.
EP-A1-0,546,803 disclose a kind of diversity antenna that comprises the individual antenna element.This antenna element is the form with quarter-wave monopole, and it can alternately be fed at an end or the other end place in the public RF feeding source.
US-A1-5,541,614 disclose a kind of antenna system, and it comprises that being embedded in frequency selects a group switching centre on photonic band-gap (photonic bandgap) crystal to present dipole antenna with segmentation.For example pass through each section of connection/disconnection dipole arm so that they are longer or shorter, can change some characteristic of antenna system.
Yet, the configuration of these prior aries wherein and none be described on some intelligent basis (for example owing to signal situation causes when needing) and connect or cut off any switchable antenna element.Described EP-A1-0,546,803 mention so possibility of intelligence switching, but how not to control the indication of this switching.
Summary of the invention
A main purpose of the present invention provides a kind of antenna equipment that is used to transmit and receive radio wave, it can be connected to a radio communication equipment, and comprise the transmitter and receiver part, described receiver section comprises an antenna structure that can switch between a plurality of antenna structure states, each of a plurality of antenna structure states is passed through such as resonance frequency, input impedance, bandwidth, radiation mode, gain, the parameter that one group of radiation of polarization and near field pattern and so on is relevant is distinguished, and a switching device that is used between described a plurality of antenna structure states, optionally switching described antenna structure, its antenna equipment is multiduty and can adapts to various situations and be applicable to the function that obtains expectation.
In this respect, a specific purpose of the present invention provides such antenna equipment, and it shows more performance than the antenna equipment of prior art.
Another object of the present invention provides a kind of antenna equipment, and its some characteristic is controllable, such as resonance frequency, impedance, radiation mode, polarization, bandwidth and diversity and so on.
Another object of the present invention provides a kind of antenna equipment, it antenna structure and switching device between show a controllable interaction.
A further object of the present invention provides a kind of antenna equipment, and it is simple, light, be easy to make and cheap.
A further object of the present invention provide a kind of effectively, be easy to install and antenna equipment reliably, particularly, even mechanically still firm after using for a long time.
A further object of the present invention provides a kind of being suitable for as an integration section of radio communication equipment and the antenna equipment that is used.
By antenna equipment, reached these purposes of the present invention by a kind of radio communication equipment and by the described method of claims.
In the claims, ＂ antenna structure ＂ means the active element that comprises on emission (presenting) line (group) that is connected to the radio communication equipment circuit, and can be grounded or be left disconnection and therefore as for example those elements of finder, reflector, impedance matching element or the like.
Description of drawings
From the detailed description of the embodiment of the invention that provides below and provide by explanation just and therefore do not limit the accompanying drawing 1-7 of the present invention and will understand the present invention more completely.
Fig. 1 has schematically shown the block diagram that is used to transmit and receive the Anneta module of radio wave according to the embodiment of the invention.
Fig. 2 has schematically shown reception or transmit antenna element and a switching device, is used for optionally connecting and disconnecting as the reception antenna element according to an Anneta module part of the present invention.
Fig. 3 has schematically shown a reception or sending antenna structure and a switching device, be used for optionally as an antenna equipment part according to the present invention the described reception antenna structure selectivity ground at various differences place ground connection.
Fig. 4 is the switching and the fixing flow chart of examples of algorithms of switching device that is used to control the antenna equipment of invention.
Fig. 5 is a flow chart of replacing examples of algorithms of switching device that is used to control the antenna equipment of invention.
Fig. 6 is that the another one of switching device that is used to control the antenna equipment of invention is replaced the flow chart of examples of algorithms.
Fig. 7 has schematically shown reception or transmit antenna element and a switching device, is used for optionally connecting and disconnecting the reception antenna of a conduct Anneta module part according to a different embodiment.
Preferred forms
In following explanation, the unrestricted purpose for explanation has been illustrated concrete details, so that complete understanding of the present invention is provided., for a person skilled in the art clearly, the present invention can be practiced among other embodiment that departs from these details.In other example, the equipment of knowing and the details of method are described and are omitted so that the present invention can be not unclear because of unnecessary details.
The Anneta module (Fig. 1) of invention
With reference to figure 1, comprise transmitter (TX) 2 and receiver (RX) 3 RF parts separately according to the antenna equipment or the module 1 of the embodiment of the invention.
Anneta module 1 is high frequency (HF) part that is used to transmit and receive the radio communication equipment (not shown) of radio wave.Therefore, Anneta module 1 preferably is arranged to numeral or the analogue signal processor that is electrically connected to radio communication equipment by radio communication line.
Anneta module 1 preferably is arranged on the carriage (not shown), and this carriage can be a substrate flexibly, a MID (mold interconnect equipment) or a PCB.So Anneta module PCB can be installed in together side by side with a PCB of radio communication equipment in (particularly can be detachably mounted on) same basically plane, and perhaps it can be affixed on the insulation supportive device that for example is installed on the wireless device PCB and so still be higher than the there so that it walks abreast with the insulation supportive device basically.The Anneta module PCB PCB with radio communication equipment basically is vertical.
Transmitter section 2 comprises an input 4, is used for the numeral transmission source receiving digital signals from radio communication equipment.Input 4 is connected to through transmission line 5 that to be used for digital signal conversion be a digital simulation (D/A) converter 6 of analog signal.Converter 6 further is connected to through transmission line 5 and is used for the up converter 7 of frequency analog signal up conversion for expectation RF frequency.Up converter 7 is connected to a power amplifier (PA) 8 that is used for the amplification frequency figure signal successively through transmission line 5.Power amplifier 8 further is connected to a transmitter antenna equipment 9 and is used to pass on the RF signal that amplifies and is used for according to described signal radiation RF ripple.A filter (not shown) can be arranged in the signal path before or after the power amplifier.
The equipment 10 that is used for measuring voltage standing-wave ratio (VSWR) in transmitter section preferably as among Fig. 1, is connected in transmitter section 3 between power amplifier 8 and the transmitter antenna equipment 9, perhaps is bonded in the transmitter antenna equipment 9.
Transmitter antenna equipment 9 comprises a switching device 11 and sending antenna structure 12 that is connected to transmission line 5, and it is preferably by forming through a plurality of transmit antenna element that switching device 11 is connected to transmission line 5., about the present invention, transmitter antenna equipment 9 can be made up of the single transmitting antenna that is forever connected equally well.
Receiver section 3 comprises a reception antenna structure 13 that is used to receive the RF ripple and is used for producing according to it a RF signal.Reception antenna structure 13 can be switched between a plurality of (two) antenna structure state at least, its each distinguish by one group of radiation relevant parameter, such as resonance frequency, input impedance, bandwidth, radiation mode, gain, polarization and near field pattern and so on.Switching device 14 be arranged at it near be used between the antenna structure state optionally switched antenna structure 13.Reception antenna structure 13 and switching device 14 can integrally be arranged in the receiver antenna equipment 15.
Antenna structure 13 can comprise respectively can be connected to transmission line 16 or to a plurality of elements of RF ground connection (not shown) and/or comprise and can be connected to transmission line 16 or vacate a little to a plurality of connections of RF ground connection that this will further be described below.
Antenna structure 13 further is connected to the one or more low noise amplifiers (LNA) 17 that are used to amplify received signal through transmission line 16.In originally explaining the situation, the RF of antenna structure 13 presents and can be implemented through switching device 14, perhaps can be implemented outside switching device 14 respectively.
If receive diversity is used, then output is merged in combiner 18 from the signal in the low noise amplifier 17.It can be switching type that diversity merges, or the weighted sum of signal.
Transmission line 16 further is connected to a downconverter or a down-conversion mixer 19 that is used for the downconverter signal frequency and is connected to an analog digital (A/D) converter 20 that is used for received signal is transformed to digital signal.Digital signal is output to the digital processing circuit of radio communication equipment at 21 places.
According to the present invention, be provided for a kind of control appliance 22 of the switching device 14 in the receiver control part 3, and therefore according to a measurement representing reflection coefficient at transmitter section 2 places, optionally connect and disconnect the some parts of reception antenna structure 13, at this, this measurement can be a voltage standing wave ratio (VSWR) of being measured by equipment 10.Similarly, reflection power can be measured., though below this explanation will only be meant that VSWR should be appreciated that other reflection measurements also are used.
By switching device 14, the connection and the disconnection of control antenna structure 13 some parts easily.By ressembling the antenna structure 13 that is connected to transmission line 16, the radiation relevant parameter such as resonance frequency, input impedance, bandwidth, radiation mode, gain, polarization and the near field pattern of receiver antenna equipment 15 can be changed.
VSWR preferably by with the time interval of rule or continuously the sampling measured repeatedly during use.
Control appliance 22 can be arranged for controlling switching device 14 and come switching state according to the measurement VSWR that receives repeatedly between the operating period of the Anneta module 1 in radio communication equipment, make dynamically to allow antenna equipment 1 in the adjacent ambient of this radio communication equipment, adapt to object, such as user himself.Therefore, the performance of the receiver section 3 of Anneta module can be during use by optimization constantly.
Control appliance 22 preferably includes a central processing unit (CPU) 23 that has memory 24, and memory 24 is connected to measuring equipment 10 and via line 27 is connected to switching device 14 through connecting 25,26.CPU23 preferably is equipped with the various antenna structure data that a suitable control algolithm and memory 24 are used to bank switching.Switching device 14 preferably includes a Micro Electro Mechanical System (MEMS) switching equipment.
Therefore CPU23 receives from the measurement VSWR value in the VSWR measuring equipment 10 by circuit 25,26 and handles the VSWR value of each reception.If it finds that it matches (according to any control algolithm that has realized), then its via line 27 sends the switching command signal to switching device 14.
Best, the antenna structure 12 of transmitter section 2 also can switch between a plurality of (two) antenna structure state at least, its each distinguish by one group of radiation relevant parameter such as resonance frequency, impedance, radiation mode, polarization and bandwidth, and switching device 11 is arranged for optionally switching described antenna structure according to the control signal that sends through control line 28 from control appliance 22.
In addition, Anneta module 1 comprises that is used for the control port 29 that via line 29a signals between the circuit of CPU23 and radio communication equipment.Therefore, power amplifier 8, low noise amplifier 17 and combiner 18 via line 30,31 and 32 and Be Controlled respectively.In Fig. 1, last, reference number 33 expressions are arranged in the parallel-to-serial converter in the transmitter section 2, are used for parallel signal line 25,28,30 is for conversion into a serial transmission line 26.This is used to reduce number of, lines and number of connection therefore between transmitter section 2 and receiver section 3.
As selection, CPU23, memory 24 and control port 29 can be arranged in transmitter section 2 and therefore parallel-to-serial converter 33 be arranged at receiver section 3 so that obtain same purpose.
Also therefore, it can be called as a numerically controlled antenna (DCA) to have only digital port (input 4, output 21 and control port 29) as Anneta module 1 illustrated in fig. 1.
Yet, should be appreciated that, may not be to comprise A/D and D/A converter, frequency converter or amplifier according to Anneta module of the present invention.In any situation, Anneta module obviously will have analog input and output port.
Operating environment
Next, will the various operating environments that may influence according to antenna equipment of the present invention or module performance be described.
Antenna parameter such as the resonance frequency of small size Wireless Telecom Equipment, input impedance, bandwidth, radiation mode, polarization, near field pattern is influenced by near the object this equipment.Here, be meant such distance nearby: in the interior influence to antenna parameter of this distance is noticeable.This distance roughly expands to from the about wavelength of this equipment.
A small size Wireless Telecom Equipment such as mobile phone can be used in many different adjacent ambients.
It is held in ear as a phone, and it can be put in the pocket, and it can be attached on the belt of waist, and perhaps it can be by hand-held.In addition, it can be placed on the metal desk.Many operating environments can be enumerated.Common is for all environment: have object near this equipment, thereby influence the antenna parameter of this equipment.Near this equipment, there is the environment of various objects that antenna parameter is had different influences.
Following two specific operating parameters will be discussed clearly.
By radio communication equipment being positioned at space (FS) operating environment that to gain freedom in the vacuum space, that is, near this equipment, there is not object.Be considered to free space in the air here around this equipment.Many operating environments can be approximately the free space environment.Usually, if this environment has seldom influence to antenna parameter, then it can be called as free space.
Talking position (TP) operating environment is defined as such position: in this position, this radio communication equipment is held in ear by the user.The people who controls this equipment is depended in influence variation to antenna parameter, says so more accurately and depends on how this equipment locatees.Here, the TP environment is considered to an ordinary circumstance,, is included in above mentioned all individual variations that is.
Resonance frequency (Fig. 2)
Next, will describe in more detail can controlled various radiation relevant parameters according to the present invention, such as resonance frequency, input impedance and radiation mode.
The antenna that is used for wireless radio communication equipment stand since the user have a caused imbalance.For many antenna types, and when being arranged in free space, equipment compares resonance frequency some percentages that may descend when the user exists.
Self-adapting tuning between free space and talking position can reduce this problem substantially.
A kind of direct mode of tuned antenna is the electrical length that changes it, thus and change resonance frequency.Electrical length is long more, and then resonance frequency is low more.If the change of electrical length is enough big, then this also is to produce the most direct mode that frequency band switches.
Figure 2 illustrates a kind of and comprise the antenna structure 35 of similar circuitous (meander-like) that the switching device 36 of a plurality of switching 37-49 is arranged together.Antenna structure 35 can be counted as a plurality of alignings and each attachable antenna element 50-54, and it is connected to feed point 55 by switching device 36 in connection status.Feed point 55 also is connected on the low noise amplifier of receiver circuit (not shown) of radio communication equipment, and therefore antenna structure 35 is operating as reception antenna.Low noise amplifier alternately can be arranged in Anneta module with antenna structure 35 and switching device 36.As selection, feed point 55 is connected to the power amplifier of the radio communication transmitter that is used to receive the RF signal, and therefore antenna structure 35 is operating as transmitting antenna.
A kind of typical operation example is as follows.Suppose switch 37 and 46-49 be closed and remain to switch and be opened and it is suitable for optimum performance when a kind of like this antenna structure state is arranged at the hand portable phone that is arranged in free space.When this phone was moved to talking position, user's influence had reduced resonance frequency and therefore, in order to compensate user's existence, switched 49 and was opened, the electrical length that therefore connects antenna structure be reduced and correspondingly resonance frequency be increased.This increase will utilize a kind of suitable design of antenna structure 35 and switching device 36 to compensate the reduction of being introduced when phone when free space moves to talking position.
Same antenna structure 35 and switching device 36 also can be used to switch between two different frequency bands such as GSM900 and GSM1800.
For example, if will comprise the antenna element 50-53 that is connected to feed point 55 (switch 37 and 46-48 close and remain to switch open) a kind of antenna structure state of antenna element 50-53, be used for being fit to the GSM900 frequency band, then switch to the GSM1800 frequency band by opening switching 47 simply, therefore, the electrical length of the antenna structure (element 50 and 51) that connects is reduced to half of approximately previous length at present, this means that resonance frequency approximately is doubled, and this will be suitable for the GSM1800 frequency band.
Impedance (Fig. 3)
Replace a tuning Quiescent Antenna, people can finish the self adaptation impedance matching, and it comprises allows resonance frequency be offset a little and compensate this imbalance by coupling.
An antenna structure can have feed point in different positions.Each position has a different ratio between E and H field, and this causes different input impedance.If it is seldom influential to the remainder of antenna structure that feed point is switched, then can utilize this phenomenon by switching feed point.When antenna is experienced because during user's's (or other object) the caused imbalance of appearance, antenna can mate with feed line impedance by the feed point that for example changes antenna structure.According to a kind of similar mode, the RF earth point can be changed.
In Fig. 3, schematically show a kind of like this example that realizes of antenna structure 61, its can be at apart plurality of different points place by RF ground connection optionally.Antenna structure 61 is the F antenna (PIFA) of the planar inverted on a kind of PCB62 that is installed in radio communication equipment in originally explaining the situation.Antenna 61 has the RF ground connection 64 of vacating that feeder line 63 is different with the N bar.By switching to another one from a RF ground connection, impedance is changed a little.
And, cut into/cut out passive antenna elements and can produce an impedance matching, because intercoupling from passive antenna elements to the active antenna element produces a mutual impedance, it is added in the input impedance of active antenna element.
The typical use location of outside FS and the TP other can be defined, on waist location, pocket position and steel table.Each situation can have one typical tuning/coupling so that have only the point of limited quantity need be switched by.If the outer limits of the imbalance of antenna element can be found, then need the scope of self-adapting tuning/coupling of being covered by antenna equipment to be estimated.
A kind of realization is some antenna structure states that definition covers tuning/impedance matching scope.Between each different antenna structure state, can have and equate or unequal impedance difference.
Radiation mode
The radiation mode of wireless terminal is influenced by the existence of the user in its near-field region or other object.Introduce consumable material and not only change radiation mode, and, in radiant power, introduce loss owing to absorb.
If the radiation mode of terminal is adaptive control, then this problem can be reduced.Radiation mode (near field) can probably be guided to depart from the object of introducing loss, and this will reduce total losses.
One in the radiation mode changes the electric current that needs generation to want reformed electromagnetic radiation.Usually, for a little equipment (for example, a hand portable phone), need in antenna structure, sizable change come mutagenic electric current particularly for lower band.Yet, can carry out it by the another kind of antenna type that switches to the different radiation modes of generation or another antenna structure that switches to the PCB another location/side of radio communication equipment.
Another kind of mode can be: switch to the another kind of antenna of not doing so (for example loop aerial) from the PCB interactional antenna structure of extreme (for example whiplike or microstrip antenna) with radio communication equipment.This will greatly change the electric current of radiation, because introduce big electric current with the interaction partners PCB (this PCB is used as main irradiation structure) of PCB.
Notice that the object in the near-field region of equipment will change antenna feed impedance.Therefore, VSWR may be the good indicator that the moment of little loss is arranged.The VSWR of free space compares, and the little variation among the VSWR means because near the caused little loss of object.
Above discussion relate to antenna near-field and from the loss in the object in the near field., in the ordinary course of things, people can guide the main beam in the far field pattern on the beneficial direction of a generation excellent signal situation.
According to a kind of similar mode, polarization can be changed so that improve signal situation.
Algorithm (Fig. 4-6)
The VSWR that measures is processed in the algorithm of some kind of control switching state.The algorithm of all descriptions all is examination poor (trial-and-error) type because less than about the information of new state till it is reached.
Below, with reference to figure 4-6, some the algorithm example that is used for control antenna is described.
Simple algorithm may be a kind of switching and fixing algorithm, shown in the flow chart of Fig. 4.Here, at predefine state i=1 ..., N (N=2 for example, a kind of state for FS be optimization and another state is an optimization for TP) between carry out and switch.A state i=1 is selected at first, and subsequently, in step 65, VSWR is measured.The VSWR that measures compares with the predefine limit (threshold value) in step 66 then.If this threshold value is not exceeded, then this algorithm turns back to step 65, and if it is exceeded, then carry out a switching to new state i=i+1.If i+1 surpasses N, then carry out the state 1 that switches to.Through after this step, this algorithm turns back to step 65.A time delay can be arranged here switch according to a kind of too fast time scale so that prevent.
Use a kind of like this algorithm, each state 1 ..., N is used till detected VSWR surpasses the predefine limit.When this took place, this algorithm execution in step was by till the predefine state is when reaching the state with the VSWR that is lower than threshold value.The transmitter and receiver antenna structure both can be switched simultaneously.Can define the state of arbitrary number, make between various states, to carry out and switch.
Another example is a kind of more senior switching and fixing algorithm, shown in the flow chart of Fig. 5.With the mode identical with previous algorithm, the scheduled justice of N kind state, and a state i=1 is selected at first, and subsequently, in step 68, VSWR is measured, and in step 69, compares with threshold value.If threshold value is not exceeded, then this algorithm turns back to step 68, if but it is exceeded, and then then be step 69, wherein, all states all were switched and for each state measurement VSWR.All VSWR are compared and to have the state of minimum VSWR selected.
Step 70 looks and may look like:
For i=1: N
Switch to state 1
Measure VSWR (i)
Storage VSWR (i)
Switch to the state of minimum VSWR
At last, this algorithm turns back to step 68.Notice that this algorithm may need quickish switching and VSWR to measure, because all states must be switched in step 70.
Another is replaced algorithm and has been particularly suitable for multiple predefine antenna structure state, and it can be arranged so that two adjacent states have the radiative property of having only a little deviation.In Fig. 6, represented a kind of like this flow chart of other algorithm.
The scheduled justice of N kind state, an and junior one state i=1 is selected, a V parameter SWRold is set to zero, and variable ＂ change ＂ is set to+1.Measured and the storage of VSWRi in the first step 71 (VSWR of state i), in step 72, VSWRi compares with VSWRold subsequently.If on the one hand, VSWRi＜VSWRold then then is a step 73, wherein, ＂ change ＂ is set to+change (in fact this step I there is no need).Then be step 74 and 75, wherein, respectively, VSWRold is provided to present VSWR, that is, VSWRi, and the antenna structure state is changed the ＂ into i+ ＂ change, that is, and i=i+change.Then, this algorithm turns back to step 71.If on the other hand, VSWRi＞VSWRold then then is a step 76, wherein, variable ＂ change ＂ is set to-change.Next, this algorithm proceeds to step 74 and 75.Attention: in this case, this algorithm changes ＂ direction ＂.
It is important: when switching state is changed in each circulation, use a time delay so that only in specific time step strong point operation circulation (respectively, 71,72,73,74,75,71 and 71,72,76,74,75,71).At 72 places, current state (VSWRi) is compared with a previous state (VSWRold).If VSWR is better than previous state, then the also state variation in same ＂ direction ＂ is performed.When reaching an optimal value, employed antenna structure state will swing back and forth between two adjacent states of each time step strong point usually.When reaching end state 1 and N respectively, this algorithm can further not continue respectively to switch to N state and 1, switches to state 2 and N-1 but preferably be fixed on end state place respectively up to it.
This algorithm is supposed difference relatively little between two adjacent states, and this antenna structure state is arranged so that the rate of change between each state probably equates.This is meant has a similar numerical value change for example in resonance frequency between each state.For example, the PIFA antenna structure present and RF ground connection between little variation in the spacing will be fit to this algorithm fully, referring to Fig. 3.
In described all algorithms, may only essential execution switching in the specified time interval that is fit to the radio communication equipment operation.
Replace the option (not shown in FIG.) as another one, the control appliance 22 of Fig. 1 can be supported a question blank that has absolute or relative voltage standing-wave ratio (VSWR) scope, its each all relevant with separately antenna structure state.A kind of like this providing is used to seek a suitable antenna structure state that provides measurement VSWR value with allowing control appliance 22 to consult this question blank, and is used for switching device 14 is adjusted to this suitable antenna structure state.
Should be appreciated that described all algorithms can be used for controlling the switching of any reception and sending antenna structure.
Other antenna structure (Fig. 7 a-f)
Next, with reference to figure 7a-f, be used for optionally connecting and disconnecting the reception antenna structure of reception antenna structure and the various ios dhcp sample configuration IOS DHCPs of switching device as the part of Anneta module 1 according to the present invention with describing briefly.
At first with reference to figure 7a, it shows and is arranged in a switching device or element 81 an antenna structure model on every side.This antenna structure comprises the reception antenna element, here is the form with four coil antenna elements 82.In each coil antenna element 82, form a ring-type passive antenna elements 83.
Switch unit 81 comprises and is arranged the matrix that is used to connect and disconnect the electric controlled switching (not shown) of antenna element 82 and 83.These switchings can be that PIN diode is switched, perhaps GaAs field-effect transistor, and FET, but preferably Micro Electro Mechanical System (MEMS) switches.
By switch unit 35, the coil antenna element is can be mutually in parallel or be connected in series, and perhaps some element can be connected in series and some is connected in parallel.In addition, one or more elements can fully be cut off or be connected to RF ground connection (not shown).
Next, with reference to figure 7b, it shows one and replaces antenna structure.It comprises all antenna elements of Fig. 7 a and in addition coil antenna element 82,83 each between comprise the antenna element 84 of a circuitous shape.The antenna element 84 of one or more this circuitous shapes can be used respectively or according to any combining form with the loop aerial element.
In Fig. 7 c-e, show the antenna structure that comprises two slot aerial elements being connected respectively on the switching device 81 85, two circuitous shape antenna elements 87 and two microstrip antennas 89.Every day, kind of thread elements 85,87, and 89 can present connection 86,88,90 places vacating of replacement is fed.
At last, Fig. 7 f shows a kind of antenna structure, comprises whip antenna and/or helical antenna 91 and a circuitous shape antenna element 92 of being connected on the switching device 81.
Above-mentioned antenna equipment is the part of antenna concept, it is further described and is explained in detail in our following common pendent Swedish patent application: ＂ An antenna devicefor transmitting and/or receiving RF waves ＂ (a kind of antenna equipment that is used to launch and/or receive the RF ripple), ＂ Antenna device and method fortransmitting and receiving radio waves ＂ (being used to transmit and receive the antenna equipment and the method for radio wave) and ＂ Antenna device for transmittingand/or receiving radio frequency waves and method relatedthereto the ＂ antenna equipment and the correlation technique thereof of received RF ripple (be used to launch and/or), therefore all these and the identical date application of the application are incorporated herein by reference them.
Clearly, the present invention can be different in a plurality of modes.This variation is not considered to depart from scope of the present invention.All these type of modifications clearly are to mean within the scope that is included in claims to one skilled in the art.
Claims (34)
1. antenna equipment (1) that is used to transmit and receive radio wave can be connected on the radio communication equipment, and comprise:
-transmitter (2) and receiver (3) part, described receiver section comprises
-one the reception antenna structure (13 that can between a plurality of antenna structure states, switch, 35,61,82-85,87,89,91,92), its each distinguish by one group of coherent radiation parameter such as resonance frequency, input impedance, bandwidth, radiation mode, gain, polarization and near field pattern and
-one switching device (14,36,81) optionally switches described antenna structure between described a plurality of antenna structure states, it is characterized in that:
-receiving system, be used for being received in first of expression reflection coefficient that transmitter section (2) measures is measured and
-one control appliance (22), receive measurement according to described first of expression reflection coefficient, be used to control the switching device (14,36 of described receiver section, 81) and therefore antenna structure (13 between described a plurality of antenna structure states, 35,61,82-85,87,89,91,92) selectivity is switched.
2. antenna equipment as claimed in claim 1 is characterized in that: described receiving system is arranged for receiving repeatedly first of expression reflection coefficient and measures.
3. antenna equipment as claimed in claim 2, it is characterized in that: described control appliance (22), between the operating period of the described antenna equipment in radio communication equipment, be arranged for controlling described switching device (14 according to first measurement of the described expression reflection coefficient that receives repeatedly, 36,81) between described a plurality of antenna structure states, switch, make described antenna equipment dynamically adapt to the arbitrary objects of described radio communication equipment in the neighbourhood.
4. as any one described antenna equipment of claim 1-3, it is characterized in that: each of described a plurality of antenna structure states is suitable for the use of antenna equipment (1) in each predefined operation environment in the described radio communication equipment.
5. antenna equipment as claimed in claim 4, it is characterized in that: the first antenna structure state of described a plurality of antenna structure states is applicable to the use of antenna equipment (1) in free space in the described radio communication equipment, and the second antenna structure state of described a plurality of antenna structure states is applicable to the use of antenna equipment in talking position in the described radio communication equipment.
6. antenna equipment as claimed in claim 5 is characterized in that: the third antenna configuration state of described a plurality of antenna structure states is applicable to the use of antenna equipment in waist location in the radio communication equipment.
7. antenna equipment as claimed in claim 6 is characterized in that: the 4th antenna structure state of described a plurality of antenna structure states is applicable to the use of antenna equipment in the pocket position in the radio communication equipment.
8. as any one described antenna equipment of claim 1-7, it is characterized in that: it is arranged for receiving measurement according to described first of expression reflection coefficient and comes switch of frequency band.
9. as any one described antenna equipment of claim 1-8, it is characterized in that: it is arranged for receiving measurement according to described first of expression reflection coefficient connects takeover diversity function and disconnection.
10. as any one described antenna equipment of claim 1-9, it is characterized in that: described transmitter section (2) also comprises
-one sending antenna structure (12) that can between a plurality of sending antenna structure states, switch, its each distinguish by one group of coherent radiation parameter such as resonance frequency, impedance, radiation mode, polarization and bandwidth and
-one transmitter switching device (11) is used for optionally switching described sending antenna structure between described a plurality of sending antenna structure states, wherein,
-control appliance (22) is arranged for receiving the described transmitter switching device that described transmitter section is controlled in measurement according to described first of expression reflection coefficient, and the therefore optionally switching of sending antenna structure between described a plurality of antenna structure states.
11. as any one described antenna equipment of claim 1-10, it is characterized in that: described control appliance (22) is arranged for receiving measurement according to described first of expression reflection coefficient and surpasses (66,69,72) threshold value is controlled the switching device at least (14,36,81) of described receiver section (3) so that optionally switch (67 between described a plurality of antenna structure states, 70,75) the reception antenna structure (13,35,61,82-85,87,89,91,92).
12., it is characterized in that as any one described antenna equipment of claim 1-10:
The switching device at least (14,36,81) that-described control appliance (22) is arranged for controlling described receiver section (3) optionally switches reception antenna structure (13,35,61,82-85,87,89,91,92) by described a plurality of antenna structure states,
-described receiving system be arranged for receiving each antenna structure state expression reflection coefficient separately measurement and
-described control appliance (22) also is arranged for receive to measure surpassing (69) threshold values according to described first of expression reflection coefficient and controls the switching device of described receiver section and come described reception antenna structure selectivity ground is switched to the antenna structure state with minimum measurement of representing reflection coefficient.
13. as any one described antenna equipment of claim 1-10, it is characterized in that: control appliance (22) is arranged for that described first of expression reflection coefficient is received the previous reception measurement of elder generation of measuring with the expression reflection coefficient and compares (72), and is used for coming optionally to switch (70) described reception antenna structure according to the described switching device at least of relatively controlling described receiver section between described a plurality of antenna structure states.
14. as any one described antenna equipment of claim 1-10, it is characterized in that: described control appliance (22) is preserved a question blank that has absolute or relative measurement of reflection-factor scope, its each relevant with separately antenna structure state, and described control appliance is arranged to consult the switching device at least (14 that described question blank is used to control described receiver section, 36,81).
15. as any one described antenna equipment of claim 1-14, it is characterized in that: described at least a plurality of reception antenna configuration states comprise the connection reception antenna element (13,50-54,82-85,87,89,91,92) of different numbers.
16. as any one described antenna equipment of claim 1-15, it is characterized in that: described at least a plurality of reception antenna configuration states comprise the relation of presenting of different arrangement.
17. as any one described antenna equipment of claim 1-16, it is characterized in that: described at least a plurality of reception antenna configuration states comprise the RF ground connection (64) of different arrangement.
18. as any one described antenna equipment of claim 1-17, it is characterized in that: described control appliance (22) is arranged in the described receiver section (3).
19. as any one described antenna equipment of claim 1-18, it is characterized in that: described control appliance (22) comprises that a central processing unit (23) and one are used to store antenna structure memory of data (24).
20. as any one described antenna equipment of claim 1-19, it is characterized in that: it comprises an equipment (10), measures reflection coefficient and is used for the described measurement of reflection-factor is sent to described receiving system.
21. as any one described antenna equipment of claim 1-20, it is characterized in that: described switching device (14,36,81) comprises a Micro Electro Mechanical System (MEMS) switching device.
22. as any one described antenna equipment of claim 1-21, it is characterized in that: described antenna structure comprises a switchable antenna element, it has circuitous (84,87,92), ring-type (82), slit (85), little band (89), whiplike (91), scroll, helical form and crumb form structure is any.
23. the antenna equipment (1) that can be connected on the radio communication equipment comprises:
-transmitter (2) and receiver (3) part, described transmitter section comprises
-one input (4) is used for receiving the RF signal from the transmitter circuitry of described radio communication equipment,
-one power amplifier (8), be used to amplify described reception RF signal and
-one transmit antenna element (12) is used to receive described amplifying signal and is used for coming radiation RF ripple according to it, and described receiver section comprises
-one the reception antenna structure (13 that can between a plurality of antenna structure states, switch, 35,61,82-85,87,89,91,92), its each distinguish by one group of coherent radiation parameter such as resonance frequency, input impedance, bandwidth, radiation mode, gain, polarization and near field pattern, receive the RF ripple and pass on the 2nd RF signal according to it
-one switching device (14,36,81) is used for optionally switching described antenna structure between described a plurality of antenna structure states,
-one low noise amplifier (17), be used to amplify described reception secondary signal and
-one output (21) is used for the secondary signal of described amplification is exported to the receiver circuit of described radio communication equipment, it is characterized in that:
-receiving system, be used for being received in expression reflection coefficient that transmitter section measures measurement and
-one control appliance (22) is used for controlling according to the measurement of described reception of expression reflection coefficient the switching device of described receiver section and the therefore optionally switching of the antenna structure between described a plurality of antenna structure states.
24. a radio communication equipment is characterized in that: it comprises one as any one described antenna equipment (1) of claim 1-23.
25. in the antenna equipment (1) of a be connected to radio communication equipment that comprises transmitter (2) and receiver (3) part, described receiver section comprises:
-one antenna structure that can between a plurality of antenna structure states, switch (13,35,61,82-85,87,89,91,92), its each distinguish by one group of coherent radiation parameter such as resonance frequency, impedance, radiation mode, polarization and bandwidth and
-one switching device (14,36,81) optionally switches described antenna structure between described a plurality of antenna structure states,
A kind of method that is used to transmit and receive radio wave is characterized in that following steps:
-receive an expression reflection coefficient measurement and
-measure according to the described reception of expression reflection coefficient, control the switching device (14,36,81) of described receiver section and the therefore optionally switching of the antenna structure (13,35,61,82-85,87,89,91,92) between described a plurality of antenna structure states.
26. method as claimed in claim 25 is characterized in that: receive first of an expression reflection coefficient repeatedly and measure.
27. method as claimed in claim 26, it is characterized in that: according to described first measurement that receives repeatedly of expression reflection coefficient, switch between described a plurality of antenna structures at the described switching device of control between the operating period of antenna equipment described in the radio communication equipment, make described antenna equipment dynamically adapt to the object of described radio communication equipment in the neighbourhood.
28. as any one described method of claim 25-27, wherein, each of described a plurality of antenna structure states is suitable for the method in the described radio communication equipment (25) is used in each predefined operation environment.
29., it is characterized in that: receive measurement according to described first of expression reflection coefficient and come switch of frequency band as any one described method of claim 25-28.
30., it is characterized in that: receive to measure according to described first of expression reflection coefficient and to connect or disconnect takeover diversity function as any one described method of claim 25-29.
31., it is characterized in that: receive measurement according to described first of expression reflection coefficient and surpass (66,69 as any one described method of claim 25-30,72) threshold value is controlled the described switching device (14,36 of described receiver section (3), 81) so that between described a plurality of antenna structure states, optionally switch (67,70,75) reception antenna structure (13,35,61,82-85,87,89,91,92).
32., it is characterized in that receiving the further step of measuring above (69) threshold values according to described first of expression reflection coefficient as any one described method of claim 25-30:
-the switching device at least (14,36,81) of controlling described receiver section (3) optionally switches reception antenna structure (13,35,61,82-85,87,89,91,92) by described a plurality of antenna structure states,
-receive each antenna structure state expression reflection coefficient separately measurement and
The described switching device of the described receiver section of-control switches the antenna structure state that (70) are measured to the minimum with expression reflection coefficient to described reception antenna structure selectivity ground.
33. as any one described method of claim 25-30, it is characterized in that: described first of expression reflection coefficient is received a measurement of measuring with the previous reception of representing reflection coefficient compare (72), and between described a plurality of antenna structure states, optionally switch (70) described reception antenna structure according to the described switching device of relatively controlling described receiver section.
34. as any one described antenna equipment of claim 25-30, it is characterized in that: store a question blank that has absolute or relative measurement of reflection-factor scope, its each relevant with separately antenna structure state, and described control appliance is arranged to consult the switching device at least (254 that described question blank is used to control described receiver section, 36,825).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9903943A SE516531C2 (en) | 1999-10-29 | 1999-10-29 | Antenna device switchable between a plurality of configuration states depending on the received quantity and associated method |
| SE99039430 | 1999-10-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1390372A true CN1390372A (en) | 2003-01-08 |
| CN1240191C CN1240191C (en) | 2006-02-01 |
Family
ID=20417563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB008152268A Expired - Fee Related CN1240191C (en) | 1999-10-29 | 2000-10-24 | Antenna device and method for transmitting and receiving radio wares |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1234350A1 (en) |
| KR (1) | KR100669484B1 (en) |
| CN (1) | CN1240191C (en) |
| AU (1) | AU1318801A (en) |
| SE (1) | SE516531C2 (en) |
| WO (1) | WO2001031732A1 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1309184C (en) * | 2003-07-25 | 2007-04-04 | 株式会社Ntt都科摩 | Radio receiver, radio transmitter and impedance control method |
| CN100350758C (en) * | 2003-08-20 | 2007-11-21 | 乐金电子(中国)研究开发中心有限公司 | Built-in antenna and mobile communication terminal compatible with arrow antenna |
| US7522120B2 (en) | 2004-09-07 | 2009-04-21 | Lg Electronics, Inc. | Antenna apparatus of mobile communications terminal and operation method thereof |
| CN101420274B (en) * | 2008-12-04 | 2012-05-30 | 中国人民解放军海军工程大学 | Tuning method for long wave transmitter without electricity application |
| CN104253637A (en) * | 2013-06-27 | 2014-12-31 | 索尼公司 | Communication device and detection method |
| TWI511371B (en) * | 2013-03-08 | 2015-12-01 | Acer Inc | Communication device |
| CN112316248A (en) * | 2020-10-27 | 2021-02-05 | 上海理工大学 | Wireless passive injection liquid infusion tube state monitoring method based on surface acoustic wave technology |
| CN112753175A (en) * | 2018-09-21 | 2021-05-04 | 三星电子株式会社 | Electronic device for controlling communication circuit based on signal received from antenna |
| CN113471671A (en) * | 2021-07-05 | 2021-10-01 | 安徽安努奇科技有限公司 | Antenna structure and communication equipment with adjustable electric length |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830634B (en) * | 2012-08-24 | 2016-03-02 | 江苏惠通集团有限责任公司 | Function i ntegration system |
| US9893715B2 (en) | 2013-12-09 | 2018-02-13 | Shure Acquisition Holdings, Inc. | Adaptive self-tunable antenna system and method |
| CN106539569A (en) * | 2015-12-10 | 2017-03-29 | 悦享趋势科技（北京）有限责任公司 | Wearable physiological monitoring equipment and its antenna system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5463406A (en) * | 1992-12-22 | 1995-10-31 | Motorola | Diversity antenna structure having closely-positioned antennas |
| ATE250809T1 (en) * | 1993-05-27 | 2003-10-15 | Univ Griffith | ANTENNAS FOR PORTABLE COMMUNICATION DEVICES |
| US5530926A (en) * | 1993-10-04 | 1996-06-25 | Motorola, Inc. | Method for operating a switched diversity RF receiver |
| US5541614A (en) * | 1995-04-04 | 1996-07-30 | Hughes Aircraft Company | Smart antenna system using microelectromechanically tunable dipole antennas and photonic bandgap materials |
| GB9512620D0 (en) * | 1995-06-21 | 1995-08-23 | Philips Electronics Nv | Receiver |
| GB2327572B (en) * | 1997-07-22 | 1999-06-02 | Matsushita Communication Ind | Telephone with multiple antenna configuration |
-
1999
- 1999-10-29 SE SE9903943A patent/SE516531C2/en not_active IP Right Cessation
-
2000
- 2000-10-24 CN CNB008152268A patent/CN1240191C/en not_active Expired - Fee Related
- 2000-10-24 KR KR1020027004960A patent/KR100669484B1/en not_active IP Right Cessation
- 2000-10-24 EP EP00975088A patent/EP1234350A1/en not_active Ceased
- 2000-10-24 WO PCT/SE2000/002056 patent/WO2001031732A1/en active Application Filing
- 2000-10-24 AU AU13188/01A patent/AU1318801A/en not_active Abandoned
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1309184C (en) * | 2003-07-25 | 2007-04-04 | 株式会社Ntt都科摩 | Radio receiver, radio transmitter and impedance control method |
| CN100350758C (en) * | 2003-08-20 | 2007-11-21 | 乐金电子(中国)研究开发中心有限公司 | Built-in antenna and mobile communication terminal compatible with arrow antenna |
| US7522120B2 (en) | 2004-09-07 | 2009-04-21 | Lg Electronics, Inc. | Antenna apparatus of mobile communications terminal and operation method thereof |
| CN1747228B (en) * | 2004-09-07 | 2010-09-29 | Lg电子株式会社 | Antenna apparatus of mobile communications terminal and operation method thereof |
| CN101420274B (en) * | 2008-12-04 | 2012-05-30 | 中国人民解放军海军工程大学 | Tuning method for long wave transmitter without electricity application |
| TWI511371B (en) * | 2013-03-08 | 2015-12-01 | Acer Inc | Communication device |
| CN104253637A (en) * | 2013-06-27 | 2014-12-31 | 索尼公司 | Communication device and detection method |
| CN112753175A (en) * | 2018-09-21 | 2021-05-04 | 三星电子株式会社 | Electronic device for controlling communication circuit based on signal received from antenna |
| US11558128B2 (en) | 2018-09-21 | 2023-01-17 | Samsung Electronics Co., Ltd | Electronic device for controlling communication circuit on basis of signal received from antenna |
| CN112753175B (en) * | 2018-09-21 | 2023-03-14 | 三星电子株式会社 | Electronic device for controlling communication circuit based on signal received from antenna |
| CN112316248A (en) * | 2020-10-27 | 2021-02-05 | 上海理工大学 | Wireless passive injection liquid infusion tube state monitoring method based on surface acoustic wave technology |
| CN112316248B (en) * | 2020-10-27 | 2023-08-15 | 上海理工大学 | Wireless passive injection infusion tube state monitoring device adopting surface acoustic wave technology |
| CN113471671A (en) * | 2021-07-05 | 2021-10-01 | 安徽安努奇科技有限公司 | Antenna structure and communication equipment with adjustable electric length |
| CN113471671B (en) * | 2021-07-05 | 2023-08-25 | 安徽安努奇科技有限公司 | Antenna structure with adjustable electric length and communication equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| SE516531C2 (en) | 2002-01-29 |
| WO2001031732A1 (en) | 2001-05-03 |
| EP1234350A1 (en) | 2002-08-28 |
| KR20020040891A (en) | 2002-05-30 |
| SE9903943D0 (en) | 1999-10-29 |
| KR100669484B1 (en) | 2007-01-15 |
| CN1240191C (en) | 2006-02-01 |
| AU1318801A (en) | 2001-05-08 |
| SE9903943L (en) | 2001-04-30 |
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