EP1962372A1 - Kleine, Breitbandigeantenne mit Induktive Chassiskopplung - Google Patents

Kleine, Breitbandigeantenne mit Induktive Chassiskopplung Download PDF

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Publication number
EP1962372A1
EP1962372A1 EP06110107A EP06110107A EP1962372A1 EP 1962372 A1 EP1962372 A1 EP 1962372A1 EP 06110107 A EP06110107 A EP 06110107A EP 06110107 A EP06110107 A EP 06110107A EP 1962372 A1 EP1962372 A1 EP 1962372A1
Authority
EP
European Patent Office
Prior art keywords
chassis
antenna
chassis element
electronic equipment
interconnection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06110107A
Other languages
English (en)
French (fr)
Other versions
EP1962372B1 (de
Inventor
Arturo Adolfo Acuna Vila
Werner Dr. Schröder
Christian Thome
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hewlett Packard Development Co LP
Original Assignee
BenQ Mobile GmbH and Co OHG
Palm Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BenQ Mobile GmbH and Co OHG, Palm Inc filed Critical BenQ Mobile GmbH and Co OHG
Priority to EP06110107A priority Critical patent/EP1962372B1/de
Priority to AT06110107T priority patent/ATE484859T1/de
Priority to DE602006017582T priority patent/DE602006017582D1/de
Publication of EP1962372A1 publication Critical patent/EP1962372A1/de
Application granted granted Critical
Publication of EP1962372B1 publication Critical patent/EP1962372B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/08—Means for collapsing antennas or parts thereof
    • H01Q1/084—Pivotable antennas
    • 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
    • H01Q1/243—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 with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises

Definitions

  • the present invention relates to a means for transmitting and receiving electromagnetic waves, and in particular to a built-in antenna for use in portable electronic equipment for wireless communication.
  • Portable electronic equipment for wireless communication and in particular those used as mobile radio terminals in wireless communication networks like e.g. mobile telephones, pagers, communicators, electronic organisers, smartphones, PDA's ( P ersonal D igital A ssistants), or the like are designed to show a small form factor, i.e. they are designed for providing a multitude of functions and services within a housing of very compact dimensions.
  • PDA's P ersonal D igital A ssistants
  • an antenna required for a communication with a wireless communication network is usually integrated within the housing of a respective electronic appliance.
  • Various types of built-in antenna concepts have been developed that allow design an antenna small enough for fitting in a small form factor casing of a portable electronic equipment for wireless communication.
  • technologies are favoured, which enable a design of thin antennae elements, since flat antennae can be integrated more conveniently within a small casing than others.
  • Microstrip antennae formed by a conducting patch on a grounded microwave substrate are the most commonly used antenna type.
  • antenna as used in this specification covers any means that is adapted to emit or receive electromagnetic waves.
  • a respective radiator converts at least part of an incident free space electromagnetic wave into a conductor bound wave and vice versa.
  • the term antenna is therefore not restricted to any particular known embodiment, but is to be understood in the above generic meaning.
  • the lateral dimensions of a conventional microstrip antenna match a half wavelength resonance at the desired frequency.
  • a further reduction of the lateral dimensions of a microstrip antenna below a half wavelength resonance is achieved by a so-called PIFA ( P lanar I nverted F A ntenna) type antenna, the name of which is derived from the antenna's geometry when seen in a cross-sectional view.
  • PIFA P lanar I nverted F A ntenna
  • PIFA-type antennae for broadband applications require a thick spacing between the radiating antenna patch and the antenna ground plate and impose therefore a considerable limitation to any attempts for further reducing the size of portable electronic equipment for wireless communication.
  • the bandwidth achievable with PIFA-type antennae at low frequency bands is generally not satisfactorily, and for the DVB-H ( D igital V ideo B roadcasting for H andheld Devices) band that is currently on the industries roadmap, and which operates in a band from 470 MHz to 702 MHz, it is generally not acceptable.
  • chassis of a respective equipment.
  • the chassis is formed by electrically conductive elements of the printed circuit board (PCB) and the EMC ( E lectro m agnetic C ompatibility) shielding, which often create a solid metal ground plane.
  • PCB printed circuit board
  • EMC E lectro m agnetic C ompatibility
  • the chassis operates like a thick dipole antenna because it has the same kind of current distribution.
  • the maximum current density is located near the centres of the long edges, while the current density takes on small values along the short edges. Due to its similar current distribution, the electric fields of an antenna coupled to the chassis mode are like that of a dipole antenna.
  • the bandwidth of an antenna implemented as a respective chassis mode exciter usually referred to as chassis mode antenna, is strongly affected by the dimensions of the chassis. For a given structure, the highest bandwidth is achieved when the chassis is operated at half-wave resonance.
  • the chassis dimensions of present-day electronic equipment for wireless communication are typically too short for a low-band resonance and too long for a high-band resonance.
  • the electrical length of the chassis that is the resonance length of its conductive structure, has to be adapted to the resonance wavelength.
  • a capacitive chassis mode coupler is known to serve this purpose (see for instance: J. Holopainen, "Antenna for Handheld DVB Terminal", Master's thesis, Helsinki University of Technology, Espoo, May 2005 , or P. Vainikainen, J. Ollikainen, O. Kivekas, and I. Kelander, "Resonator-based analysis of the combination of mobile handset antenna and chassis", IEEE Trans. Antennas Propagat.,Vol. 50, No. 10, pp. 1433-1444, Oct. 2002 ).
  • the casing parts are either hinged for a fold-away operation (folder-type like e.g. clam-shell mobile radio phones), for enabling a pivoting or twisting movement or a sliding movement of the two casing parts with respect to each other.
  • fold-away operation folder-type like e.g. clam-shell mobile radio phones
  • these opening mechanisms are combined.
  • the chassis is composed of two interconnected large-area components, which are located side by side at an obtuse angle.
  • a capacitive coupling of a chassis mode antenna requires a huge volume at one end of the chassis and is further sensitive to any dielectric influences from outside the chassis like e.g. a finger of a user.
  • the space required for a respective capacitive coupling element is estimated to be around 3 cm 3 , which is far too much for present-day portable electronic equipment for wireless communication.
  • an antenna for use in portable electronic equipment for wireless communication with the antenna comprising a first chassis element of the portable electronic equipment, a second chassis element of the portable electronic equipment, an interconnection element for galvanically interconnecting the first chassis element with the second chassis element, and an inductive coupling element that is adapted to inductively couple to a current on the first chassis element, the second chassis element, and the interconnection element.
  • a first antenna-feeding terminal is connected to ground of the first chassis element.
  • the geometrical form of the first chassis element, the second chassis element, and the interconnection element is designed for the electrical length of the chassis formed by the first chassis element, the second chassis element, and the interconnection element to correspond to an odd multiple of a half-wavelength resonance at a specified frequency.
  • the inductive coupling element comprises a first conducting line, the first end of which is electrically connected to a second antenna-feeding terminal, and the second end of which is electrically connected to an electrode of a tuning capacitor having its other electrode electrically connected to ground of the second chassis element.
  • the capacitance of said tuning capacitor is thereby dimensioned for the input impedance between the first feeding terminal and the second feeding terminal to be of a defined and substantially real value at the specified frequency.
  • the above object is further achieved by portable electronic equipment for wireless communication having a respective antenna.
  • An antenna according to the invention combines a small volume with a large bandwidth, which is due to the utilisation of the whole chassis by the strong inductive coupling between the chassis mode and the inductive coupler. Since the implementation of the antenna requires only an addition of a capacitor and an additional conducting line to the connection between the chassis elements, it is simple to realise and inexpensive.
  • the first conducting line is preferably formed by a strip line.
  • the inductive coupling element may further be implemented comprising a further conducting line extending from the first conducting line at a location between the first end and the second end of said first conducting line to the second antenna feeding terminal, while the first end of the first conducting line is electrically connected to ground of the first chassis element.
  • the first conducting line may be arranged either laterally or vertically displaced with respect to the interconnection connecting the first chassis element with the second chassis element, thereby extending the scope for a design of the inductive coupling element by enabling a very versatile construction of the loop enclosing the magnetic flux that is adapted to the conditions set by the mechanical implementation of a hinge between the first and the second chassis element.
  • the interconnection element for galvanically interconnecting the first chassis element with the second chassis element is adapted for the total length of the joint together edge elements extending on one side of the interconnection element from the neighbouring corner of a lateral edge of the first chassis element via the interconnection element to the neighbouring corner of a lateral edge of the second chassis element to correspond to an electrical length of a half-wavelength for a specified frequency.
  • a lateral edge of a chassis element is an edge along those sides of the chassis element, which are more or less perpendicular to the chassis side connected to the interconnection element.
  • the lateral edges of the first chassis element and the second chassis element are each advantageously adapted for accommodating a half-wavelength at the specified frequency, thereby rendering the chassis formed by the first chassis element, the second chassis element, and the interconnecting element resonant to three half-wavelength at the specified frequency.
  • the antenna advantageously comprises a further inductive coupling element that is adapted to inductively couple to a further current on the first chassis element, the second chassis element, and the interconnecting element, corresponding to a different odd multiple of a half-wavelength resonance at a further specified frequency
  • the position of the second chassis element relative to the first often depends on the wireless service just used.
  • the chassis elements When used for phone applications, the chassis elements will most probably enclose an obtuse angle while when in stand-by mode or when used for watching video television, the chassis elements are more likely in a different position, like e.g. in a more or less stacked arrangement.
  • the antenna optimised for just one position like e.g. the open position where both chassis elements form a more or less obtuse angle, a mismatch of the antenna in the other position is very likely.
  • the antenna further comprises a capacitive coupling element and a switching element, which is adapted to switch between the inductive coupling element and the capacitive coupling element as a function of the angle between the first chassis element of the portable electronic equipment for wireless communication and the second chassis element of the portable electronic equipment for wireless communication.
  • the antenna comprises a PIFA-type antenna and a switching element, which is adapted to switch between the inductive coupling element and the capacitive coupling element as a function of the angle between the first chassis element of the portable electronic equipment for wireless communication and the second chassis element of the portable electronic equipment for wireless communication.
  • the switching element is preferably adapted to switch between the inductive coupling element and the capacitive coupling element or the PIFA-type antenna element within a small angular interval at a defined angle between the first chassis element and the second chassis element.
  • the switching element is favourably formed by a capacitive switch.
  • the capacitive switch comprises two variable capacitors, each of which is adapted to vary its capacitance in dependence of the angle between the first chassis element and the second chassis element and opposite to the respective other variable capacitor.
  • portable electronic equipment for wireless communication includes mobile radio communication equipment, which is also referred to as a mobile radio terminal, a collective term comprising all equipment such as mobile telephones, pagers, and communicators like electronic organisers, smartphones or the like more.
  • the antenna 100 shows three main components, a first chassis element 1, a second chassis element 2 connected to the first chassis element by a connection element 3, and an inductive coupling element.
  • the inductive coupling element is formed by the interconnection element 3 located between the first chassis element 1 and the second chassis element 2, a conducting line 5 extending from the first chassis element 1 to an electrode of a capacitor 6, which other electrode is terminated against ground of the second chassis element 2.
  • the interconnection 3 is usually formed by a flexible PCB ( P rinted C ircuit B oard) having a contiguous conducting shield, which connects the two chassis elements and encloses the tracks for electrical connections between the two chassis elements formed on the PCB.
  • the conducting shield provides the connection element with a defined length and geometry and defines the connection points to the chassis elements.
  • One chassis element is accommodated within the base part of a folder-type mobile radio terminal, the other in the flip or slidable part.
  • the first chassis element will in this description also be addressed as base part chassis while the other chassis element will be addressed as flip part chassis.
  • These denominations are arbitrary and mean no restriction to the invention. They only serve a more comprehensive explanation of the present invention. Since a transceiver may as well be housed in the flip part and since the feeding terminals of an antenna may be located in a different part of the equipment than the transceiver, a person skilled in the art will well understand that the first chassis element 1 might as well form the flip part chassis while the second chassis element 2 might form the base part chassis.
  • FIG. 2 shows a more detailed view of the section indicated by the dashed line in Figure 1.
  • the antenna 100 requires basically a conducting line 5, which is terminated at one of its ends against ground with a tuning capacitor 6.
  • a PCB ground or conductive housing of the flip part chassis 2 may be used.
  • the capacitor 6 itself may be formed as a lumped element or formed by a patch on the PCB of the chassis element.
  • the other end 7a of the conducting line 5 is e.g. located at the base part chassis and serves as a feeding terminal for the antenna 100.
  • a receiver or transmitter is connected between the terminals 7a and 7b, the latter being connected to PCB ground or conductive housing of the base part chassis 1.
  • An incoming electromagnetic wave induces a current density on the chassis of a mobile radio terminal that can be decomposed into characteristic chassis modes. Chassis modes which resonance frequency is close to the operating frequency of the mobile radio terminal are hereby dominantly excited.
  • the term operating frequency refers to a frequency specified for a certain or current operation of the portable equipment for wireless communication.
  • the total electrical length of the chassis i.e. the two chassis elements 1 and 2 including the interconnection element, corresponds to about a half-wavelength at the operating frequency.
  • the maximum induced current density appears near the centre of the open structure of the antenna 100, basically on the interconnection element 3 between the base part and the flip part of the mobile radio appliance, i.e. typically on the shield of a flexible PCB interconnection 3 as indicated by the arrows in Figure 2.
  • the induced current on the interconnection gives rise to a surrounding magnetic field 4 that is indicated in Figure 2 by circular enclosed crosses.
  • a suitably selected capacitance 6 enables to tune the input impedance of the inductive coupler at the terminals 7a and 7b for the operating frequency to take on a substantially real value of the desired magnitude.
  • the capacitance of the capacitor 6 is the key to tune the loop and with that the antenna structure 100 to resonate at the operating frequency. Due to its inductive functionality, the principle of the described arrangement is in this specification referred to as an inductive coupler or inductive coupling element.
  • the conducting line 5 can take on any form like e.g. that of a single wire. For adjusting its high frequency characteristics, however, a microwave compatible design is preferred, and effectively implemented by a strip line.
  • FIG. 3 An alternative embodiment of an inductive coupler is shown for an antenna 200 in Figure 3.
  • the conducting line 5 is again capacitively terminated at the flip part while the base part end is directly connected to PCB ground or a conductive housing of the base part.
  • the conducting line 5 is tapped at an appropriate position with another conducting line 8 for implementing a feeding terminal 9a, 9b of desired input impedance.
  • the tapped line which is preferably formed by a strip line for the first conductive line 5 being formed by a strip line works as an impedance transformer.
  • interconnection element 3 and the conducting line 5 as shown in Figures 1, 2, and 3 both resemble a common shape for interconnections used to facilitate bending, but it is to be noted that the S-like shape of the interconnection element 3 is not essential for the working of the inductive coupling element. Any other shape like e.g. a straight interconnection or strip may be used instead.
  • the lateral displacement of the conducting line 5 with respect to the interconnection element 3 as shown in Figures 2 and 3 is not essential.
  • a vertical displacement like a stacked arrangement of conducting line 5 and interconnection element 3 may also be used instead.
  • the conducting line 5 may be placed on top of the interconnection element 3 as shown for the antenna 300 in Figure 4 but also below it.
  • a distance of 1 to 2 mm between the interconnection element 3 and the coupling conducting line is sufficient.
  • the embodiment using the tapped conducting line 8 to the feeding terminal may as well be implemented in a stacked arrangement.
  • the described embodiments favour a dominant excitation of a half-wavelength chassis mode where the electrical length of the total chassis formed by the first chassis element, the connection element and the second chassis element equals approximately a half wavelength of the operating frequency of a portable electronic equipment employing an antenna structure 100, 200 or 300.
  • a respective dominant excitation is observed for the typical dimensions of an open state folder-type mobile radio terminal in the range from 500 MHz to 1 GHz. This includes the GSM850, GSM900, and DVB bands.
  • FIG. 9 A simulated characteristic of an inductively coupled antenna for the DVB applications is shown in Figure 9.
  • the antenna structure used for the simulation is indicated above the diagram. It corresponds to an antenna structure described with respect to Figures 1 and 2.
  • the diagram shows the magnitude of the input reflection coefficient at the antenna feed point referenced to 50 Ohm in decibels versus the operating frequency.
  • a return loss of at least 8 dB is achieved in the frequency range from 500 MHz to 850 MHz.
  • the limits of the frequency range are indicated by open arrow 1 and open arrow 2, respectively.
  • Figure 10 shows a simulated characteristic of an inductively coupled antenna for GSM850/GSM900 applications. A good impedance match is observed for the antenna structure shown above the diagram in the frequency range from 824 MHz to 960 MHz as indicated by the open arrows referenced 1 and 2.
  • the antenna structure used for the simulation is also a representative of the principle structure described with respect to Figures 1 and 2.
  • the described embodiments are in principle also applicable for higher frequency applications like DCS, PCS, and UMTS if tuned by a proper selection of the capacitance 6. Nevertheless it is very likely, that the physical dimensions of a folder-type phone chassis are much bigger than a half-wavelength at these frequencies, so that the chassis is preferably operated at a three half-wavelength resonance for these frequencies.
  • the schematic of Figure 5 indicates the current density orientation along the edges of the PCB ground of the base part chassis 1 and the flip part chassis 2 of a folder type radio appliance for a three half-wavelength resonance.
  • Current density nodes occur near the hinge side vertices of the base part PCB ground and the flip part PCB ground.
  • Currents on the base part 1 and the flip part 2 are exited in phase by an incident wave, which is polarised along the long axis of the open folder-type radio terminal.
  • Each chassis element 1 or 2 thus absorbs a half-wavelength.
  • Another half-wavelength can be absorbed in the slot 10 formed on one side of the interconnection element 3 by all contiguous edges between two facing corners on a lateral side of the two chassis elements.
  • the half-wavelength slot 10 is indicated in Figure 5 by a double-arrowed line marked with " ⁇ /2". Its circumferential length is designed to render approximately a half-wavelength at a specified operating frequency.
  • the direction of the current at the interconnection element 3 is opposite to the direction of the current along the base and the flip parts for the assumed conditions. Since it is mostly orthogonal in direction and compensated by currents along adjacent edges of the base and flip PCB ground, the coupling of the currents to the incoming electromagnetic wave is weak. The overall current distribution therefore couples mostly constructively with an incoming wave, but has an increased electrical length of roughly two half-wavelength.
  • the described embodiment 400 enables an antenna with a very large bandwidth as is shown in the simulation example given in Figure 11.
  • the antenna structure used for the simulation corresponds to the type shown in Figure 5, and is shown on top of the diagram with the antenna characteristic.
  • the frequency region, which is usable for DCS, PCS, and UMTS-1 applications is marked by the open arrows labelled with number 1 and number 2. It stretches from 1.7 GHz to 2.17 GHz.
  • slots 10 and 11 indicated in Figure 5 are designed in accordance to the rules stated above for slot 10, they may also be looked at as quarter-wave slot-line impedance transformers between the current on the interconnection element (and inductive coupler) and the current along the edges of the base and flip part PCB ground.
  • Figure 6 shows a dual-frequency antenna system with two separate paired antenna feeding points for separate frequency bands.
  • the shown structure is based on the antenna concept of Figure 1.
  • the dual antenna system 500 is implemented by placing a second inductive coupler comprising antenna feeding terminal 11a and capacitor 12 near the interconnection element 3.
  • a second inductive coupler comprising antenna feeding terminal 11a and capacitor 12 near the interconnection element 3.
  • the lateral or the stacked, i.e. vertical arrangement of conducting line 5 and interconnection element 3, or a combination of both can be used to implement the two inductive couplers.
  • the lateral arrangement is shown.
  • a directly fed inductive coupler or a tapped line inductive coupler i.e. a coupler with a built-in impedance transformer can be used.
  • a simulation result of a dual-frequency, dual-feed antenna according to the concept of Figure 6 is given in Figure 12 for dual feed GSM 850, GSM 900, GSM 1800, GSM 1900, UMTS-1, and ISM 2.4 GHz band applications.
  • the antenna structure used for the simulation is shown on top of the diagram with the characteristics.
  • the antenna is matched to a first frequency band between 820 and 960 MHz (indicated by open arrows number 1 and 2) and a second frequency band stretching from 1.7 GHz to about 2.17 GHz (indicated by open arrows 3 and 4).
  • the inductive coupler concept has been described with respect to a two-part chassis, it is also applicable to a bar type chassis where the two chassis elements are to be regarded as being merged with the connection element.
  • the inductive coupling element i.e. the conducting line 5 with the capacitor 6 is in this case just placed over the middle line of the bar-type chassis.
  • an antenna structure according to one of the above described is combined with a different kind of antenna optimised for a closed state of a folder-type portable electronic equipment for wireless communication.
  • a switching element activates the antenna type that is best suited for a selected operating condition of the folder-type electronic appliance.
  • the switching element is preferably implemented as a capacitive switch enabling contactless switching and thus avoiding problems due to corrosion or staining of contact surfaces.
  • the principle of a respective antenna combination is shown in the representation of Figure 7.
  • the upper representation of Figure 7 shows an inductive coupler antenna according to an embodiment of the present invention used for the open state of a folder-type mobile radio terminal. This antenna provides the terminal 13 as an antenna feeding point.
  • the lower left representation shows the flip part 2 in a position forming a 90 degree angle with the base part 1, whereby it is assumed, that this angle forms the critical transition angle between the open position and the closed position of the appliance. In this position, a different antenna is used, which provides a terminal 14 as a feeding point.
  • This antenna can be implemented as a capacitive coupled chassis mode antenna but also as a conventional PIFA-type antenna or a different type of microstrip antenna.
  • a capacitive switch is given, using two capacitors 16 and 17, which capacitances vary with the angle between the base part 1 and the flip part 2 in opposite directions.
  • the capacitance 16 In the open state of the folder-type appliance, the capacitance 16 is very large while the capacitance 17 is very small.
  • the output 15 of a transceiver is in this case connected to the inductive coupler's feeding point 13.
  • the capacitance 16 In the closed state, the capacitance 16 is very small while the capacitance 17 is very large, so that the output 15 is connected to the second antenna's feeding point 14, e.g. to the feeding point of a capacitive coupler.
  • Changing the angle between the first chassis element 1 and the second chassis element 2 varies the capacitances of the variable capacitors 16 and 17. This is usually done when opening or closing the folder-type appliance.
  • the transition between the two switching states i.e.
  • the transition angle is preferably set near an angle of 90 degrees. For smaller angles the capacitive coupler or an alternative antenna is used, for larger angles the inductive coupler antenna is used.
  • a switch with a respective behaviour may be implemented in many ways like for instance by pivotable electrodes arranged around the axis of rotation of a folder-type casing, which form together with adjacent not pivotable electrodes rotation angle dependent capacitances.
  • FIG. 8 A further embodiment of a capacitive switch according to the principle shown in Figure 7 is shown in Figure 8.
  • a plate 18 is flapped between two positions to be near a first electrode in the closed position and near a second electrode in the open position of the folder type casing.
  • the plate may be formed by a prestressed spring electrode 18 being switched between its two stable positions shown in the top and the bottom representation respectively by means of a lever like mechanism 19.
  • a switch according to the above described may also be activated by a relative motion of the chassis elements on opening or closing the electronic equipment.
  • the pivoting motion of the chassis elements may be used, for other types a sliding motion or a twisting motion may be preferred.
  • An inductive coupling element as described in this specification has extremely small volume requirements as it adds only a conducting line and a capacitor to the already existing chassis. It therefore enables the realisation of small and low cost chassis mode antennae for folder-type portable electronic equipment for wireless communication. Due to the minimal component addition, it has also to be considered as a very low cost solution. Furthermore, the inductive coupling is insensitive to outside interference, particularly to dielectric changes in the vicinity, and provides also a higher bandwidth than common antenna concepts.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Radar Systems Or Details Thereof (AREA)
EP06110107A 2006-02-17 2006-02-17 Kleine, Breitbandigeantenne mit Induktive Chassiskopplung Not-in-force EP1962372B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP06110107A EP1962372B1 (de) 2006-02-17 2006-02-17 Kleine, Breitbandigeantenne mit Induktive Chassiskopplung
AT06110107T ATE484859T1 (de) 2006-02-17 2006-02-17 Kleine, breitbandigeantenne mit induktive chassiskopplung
DE602006017582T DE602006017582D1 (de) 2006-02-17 2006-02-17 Kleine, Breitbandigeantenne mit Induktive Chassiskopplung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06110107A EP1962372B1 (de) 2006-02-17 2006-02-17 Kleine, Breitbandigeantenne mit Induktive Chassiskopplung

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EP1962372A1 true EP1962372A1 (de) 2008-08-27
EP1962372B1 EP1962372B1 (de) 2010-10-13

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AT (1) ATE484859T1 (de)
DE (1) DE602006017582D1 (de)

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WO2010111543A1 (en) * 2009-03-27 2010-09-30 Qualcomm Incorporated Wideband antenna for portable computers
EP2262055A1 (de) * 2009-06-12 2010-12-15 Samsung Electronics Co., Ltd. Eingebaute zusammenklappbare Antenne für ein tragbares Endgerät
WO2011099694A2 (ko) * 2010-02-11 2011-08-18 라디나 주식회사 캐패시터를 이용한 그라운드 방사체
WO2011099693A2 (ko) * 2010-02-11 2011-08-18 라디나 주식회사 그라운드 방사 안테나
WO2011099692A2 (ko) * 2010-02-11 2011-08-18 라디나 주식회사 그라운드 방사 안테나
WO2012028174A1 (en) * 2010-08-31 2012-03-08 Laird Technologies Ab Antenna device and foldable electronic device comprising such an antenna device
CN102696146A (zh) * 2010-02-11 2012-09-26 拉迪娜股份有限公司 使用电容的地线辐射体
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US8648763B2 (en) 2010-02-11 2014-02-11 Radina Co., Ltd Ground radiator using capacitor
US9379427B2 (en) 2013-04-26 2016-06-28 Apple Inc. Methods for manufacturing an antenna tuning element in an electronic device
US9570800B2 (en) 2010-04-09 2017-02-14 Radina Co., Ltd Ground antenna and ground radiator using capacitor

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WO2010111543A1 (en) * 2009-03-27 2010-09-30 Qualcomm Incorporated Wideband antenna for portable computers
US8294621B2 (en) 2009-03-27 2012-10-23 Qualcomm, Incorporated Wideband antenna for portable computers
EP2262055A1 (de) * 2009-06-12 2010-12-15 Samsung Electronics Co., Ltd. Eingebaute zusammenklappbare Antenne für ein tragbares Endgerät
WO2011099692A3 (ko) * 2010-02-11 2011-10-20 라디나 주식회사 그라운드 방사 안테나
CN102771009B (zh) * 2010-02-11 2015-06-17 拉迪娜股份有限公司 地线辐射天线
WO2011099693A2 (ko) * 2010-02-11 2011-08-18 라디나 주식회사 그라운드 방사 안테나
WO2011099694A3 (ko) * 2010-02-11 2011-10-27 라디나 주식회사 캐패시터를 이용한 그라운드 방사체
WO2011099693A3 (ko) * 2010-02-11 2011-11-03 라디나 주식회사 그라운드 방사 안테나
TWI569505B (zh) * 2010-02-11 2017-02-01 拉迪娜股份有限公司 地線輻射天線
CN102696146A (zh) * 2010-02-11 2012-09-26 拉迪娜股份有限公司 使用电容的地线辐射体
WO2011099694A2 (ko) * 2010-02-11 2011-08-18 라디나 주식회사 캐패시터를 이용한 그라운드 방사체
CN102771008A (zh) * 2010-02-11 2012-11-07 拉迪娜股份有限公司 使用地线辐射体的天线
CN102771009A (zh) * 2010-02-11 2012-11-07 拉迪娜股份有限公司 使用地线辐射体的天线
US8581799B2 (en) 2010-02-11 2013-11-12 Radina Co., Ltd Ground radiation antenna
US8604998B2 (en) 2010-02-11 2013-12-10 Radina Co., Ltd Ground radiation antenna
US8648763B2 (en) 2010-02-11 2014-02-11 Radina Co., Ltd Ground radiator using capacitor
WO2011099692A2 (ko) * 2010-02-11 2011-08-18 라디나 주식회사 그라운드 방사 안테나
CN102696146B (zh) * 2010-02-11 2015-07-15 拉迪娜股份有限公司 天线辐射体
US9570800B2 (en) 2010-04-09 2017-02-14 Radina Co., Ltd Ground antenna and ground radiator using capacitor
WO2012028174A1 (en) * 2010-08-31 2012-03-08 Laird Technologies Ab Antenna device and foldable electronic device comprising such an antenna device
US9379427B2 (en) 2013-04-26 2016-06-28 Apple Inc. Methods for manufacturing an antenna tuning element in an electronic device

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