CN107104271A - A kind of low frequency loaded antenna - Google Patents
A kind of low frequency loaded antenna Download PDFInfo
- Publication number
- CN107104271A CN107104271A CN201710225713.1A CN201710225713A CN107104271A CN 107104271 A CN107104271 A CN 107104271A CN 201710225713 A CN201710225713 A CN 201710225713A CN 107104271 A CN107104271 A CN 107104271A
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- China
- Prior art keywords
- antenna
- monopole antenna
- low frequency
- resistance
- inductance
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The invention belongs to radio receiver-transmitter field, the present invention is directed to, in low frequency（Less than 100MHz）In section, the technical problem of the bandwidth of conventional monopole antenna specifically discloses a kind of low frequency loaded antenna, including：Feeder line is connected with monopole antenna, monopole antenna；Lump loading unit, lump loading unit is connected with monopole antenna；Impedance transformation component, for realizing that the impedance of feed end of monopole antenna is equal to the characteristic impedance of feeder line；Wherein, lump loading unit includes inductance and resistance, and inductance and resistance are connected with monopole antenna.
Description
Technical field
The present invention relates to radio receiver-transmitter field, and in particular to a kind of loaded antenna.
Background technology
The wireless devices such as radar, TV, navigation, broadcast are all to rely on electromagnetic wave to come transmission information, the reception of electromagnetic wave
It is to be unable to do without antenna with sending.In low frequency (being less than 100MHz) section, antenna operating wavelength is long, corresponding, designs
The size of the antenna come also can be than larger, it is difficult to be arranged in limited space on workbench.
Antenna is the part being coupled with free space in communication system, only when its size and the electricity of free space transmission
The wavelength of magnetic wave can with it is comparable when, it could be so that higher efficiency is to external radiation and receives energy.In free space, if day
The working frequency of line is low, then corresponding operation wavelength is necessarily increased with regard to president, the size of antenna.According to antenna theory, if
The size of antenna reduces, and its quality factor will increased dramatically, and bandwidth will become very narrow, and radiation resistance will become very little.Produce
Larger induced-current can then cause loss very big so that the radiation efficiency of antenna becomes very low, and gain will naturally also become very
Low, in a word, it is exactly penalty of the antenna in terms of certain that antenna size, which reduces the inevitable outcome brought,.
At present, monopole antenna is installed mostly in the terminal of some miniaturizations, monopole antenna has reached miniaturization
It is required that, but in low frequency (being less than 100MHz) section, the bandwidth of monopole antenna is very limited, it is impossible to meet the need of technological progress
Ask.Therefore design a in low frequency (being less than 100MHz) section, broadband small size antenna just seems very urgent.
The content of the invention
The present invention is directed to, in low frequency (be less than 100MHz) section, the technical problem of the bandwidth of conventional monopole antenna, is carried
A kind of low frequency loaded antenna is supplied.
The base case that the present invention is provided is：A kind of low frequency loaded antenna, including：
Feeder line is connected with monopole antenna, monopole antenna；
Lump loading unit, lump loading unit is connected with monopole antenna；
Impedance transformation component, for realizing that the impedance of feed end of monopole antenna is equal to the characteristic impedance of feeder line；
Wherein, lump loading unit includes inductance and resistance, and inductance and resistance are connected with monopole antenna.
The operation principle and advantage of the present invention is：Lump loading unit is connected with monopole antenna, constitute one it is equivalent
RLC series resonant circuits.Existing lump loading is that one or several positions add inductance, electric capacity on antenna, by this
The mode of sample changes CURRENT DISTRIBUTION on antenna, but such mode, when being applied on monopole antenna, monopole antenna exists
Performance in low frequency (being less than 100MHz) section is but and not as people's will.In the present invention, the resonance frequency of the access influence antenna of inductance
Rate and bandwidth, the bandwidth of the access influence antenna of resistance and gain.So by adjusting inductance and resistance parameter, monopole can be allowed
Antenna is realized broadband in low frequency (being less than 100MHz) section.
Impedance transformation component, ensure that the impedance matching between lump loading unit, monopole antenna and feeder line, it is ensured that single
Pole sub-antenna can normally be run.
The low frequency loaded antenna that the present invention is provided, compared with existing monopole antenna, does not occur substantially substantially in size
Change, but in effect, it is of the invention compared with existing monopole antenna, reach that monopole antenna (is less than in low frequency
100MHz) effect broadband in section.
Further, inductance is 1.73uH, and resistance is 2.12k Ω.The lump loading unit of this parameter, can preferably be expanded
Bandwidth of the present invention in low frequency (being less than 100MHz) section.
Further, in addition to sleeve, bush outer sleeve is in the top of monopole antenna, the top of monopole antenna and sleeve
Inside is connected.Sleeve is reloaded on the basis of lump loading, can further optimize Antenna Operation in low frequency band
Various performance parameters.Sleeve can regard a section termination short-circuit line as, and it is equivalent to an inductive load and is carried in monopole antenna
Top.Again because monopole antenna is antenna of the impedance in capacitive, the loading of sleeve can offset certain condensance just,
So as to reduce the resonant frequency of monopole antenna, improve the impedance operator of monopole antenna.In addition, the loading of sleeve is in itself
The effective length and horizontal width of antenna are also increased, the radiation resistance of monopole antenna has been obtained a certain degree of increasing
Plus, therefore, compared to the monopole antenna not loaded, the bandwidth of the sleeve antenna of work under the same conditions and gain also must
A certain degree of improvement is arrived.
Further, the inductance is variable inductor, and the resistance is slide rheostat.When monopole antenna is because being hit
Hit or other reasonses, cause after the profile of monopole antenna changes, the parameter of regulation inductance and resistance, can allow this hair
It is bright still to be worked in low frequency (being less than 100MHz) section.
Further, inductance is 102.70nH, and resistance is 420 Ω.The lump loading unit of this parameter, can preferably be expanded
Bandwidth of the present invention in low frequency (being less than 100MHz) section.
Further, the length of the monopole antenna is 360mm, and radius is 7.5mm, and radiation distance of the border away from antenna is
375mm.Such monopole antenna is that such antenna can be in this case for the situation that operation wavelength is 1500mm
Preferably work.
Brief description of the drawings
Fig. 1 is the simulation result figure in the E faces direction of the embodiment of the present invention 1；
Fig. 2 is the simulation result figure in the H faces direction of the embodiment of the present invention 1；
Fig. 3 is the simulation result figure in the E faces direction of the embodiment of the present invention 2；
Fig. 4 is the simulation result figure in the H faces direction of the embodiment of the present invention 2；
Fig. 5 is the simulation result figure in the E faces direction of comparative example 1；
Fig. 6 is the simulation result figure in the H faces direction of comparative example 1.
Embodiment
Below by embodiment, the present invention is further detailed explanation：
Reference in Figure of description includes：.
Embodiment 1
A kind of low frequency loaded antenna, including：
Feeder line is connected with monopole antenna, monopole antenna, the length of monopole antenna is 360mm, and radius is
7.5mm, radiation distance of the border away from antenna is 375mm；
Lump loading unit, lump loading unit is connected with monopole antenna；
Impedance transformer, for realizing that the impedance of feed end of monopole antenna is equal to the characteristic impedance of feeder line, in this reality
Apply in example, selection, model AT＆T (pin type) impedance transformer；
Wherein, lump loading unit includes inductance and resistance, and inductance and resistance connects with monopole antenna, inductance and resistance
Parameter is that inductance is 1.73uH, and resistance is 2.12k Ω.
The reactance of monopole antenna is in capacitive, then if in the input series inductance L and resistance R of antenna, you can constituted
One RLC resonance circuit, by RLC resonance circuit volumes：
Then：
And now total input impedance of antenna is：
Zin=Rin+Xin=(R+Rr+Rloss)+j(XL+XC)
After antenna input loaded cable L and resistance R, the frequency characteristic of input reactance, adjustment inductance L numerical value comes
Change the resonant frequency of antenna；Again because the bandwidth BW of antenna and the input resistance of antenna are proportional, according to the above
, resonant frequency first can be adjusted to 50MHz at 2 points, and gradually increase the resistance of resistance to expand bandwidth, make lower frequency limit to frequency
The direction of rate reduction is moved to minimum value, so as to obtain below 100MHz maximum bandwidth.By adjustment, finally give optimal
As a result, i.e. loaded cable L=1.73uH, resistance R=2.12k.
Embodiment 2
Compared with Example 1, difference is, the parameter of inductance and resistance is that inductance is 102.70nH, and resistance is 420
Ω, and also include sleeve, bush outer sleeve is connected in the top of monopole antenna, the top of monopole antenna with the inside of sleeve
Connect.
According to transmission line theory, one section of total length, which is not more than quarter-wave terminal short circuit line, can be equivalent to one
Inductive load is used, and its equivalent reactance value can calculate by following formula：
jXin=jZ0tanβl
And sleeve can then regard a section termination short-circuit line as, it is equivalent to the top that an inductive load is carried in antenna.Again
Because monopole antenna is antenna of the impedance in capacitive, the loading of sleeve can offset certain condensance just, so as to drop
The resonant frequency of low antenna, improves the impedance operator of antenna.In addition, the loading of sleeve also increases the effective of antenna in itself
Length and horizontal width, make the radiation resistance of antenna obtain a certain degree of increase, therefore, compared to the monopole not loaded
Sub-antenna, the bandwidth of the sleeve antenna of work under the same conditions and gain have also just obtained a certain degree of improvement.It is final logical
Cross optimal result i.e. loaded cable L=102.70nH, resistance value R=420 Ω that adjustment is obtained.
Embodiment 3
Compared with Example 1, difference is, the inductance is variable inductor, and the resistance is slide rheostat.
So (such as it is knocked, fractures) when a range of deformation occurs for monopole antenna, by the ginseng for adjusting inductance and resistance
Number still can allow the present invention being capable of normal work.
Comparative example 1
With size identical monopole antenna in embodiment 1 (i.e. existing parameter identical monopole antenna).
In operation wavelength λ=1500mm, length L=0.24 λ=360mm of monopole, radius R=λ/200=
7.5mm, radiation distance of the border away from antenna is λ/4=375mm.HFSS simulation softwares are used, to embodiment 1, embodiment 2 and right
The antenna of ratio 1 is emulated, and obtains the simulation result figure such as Fig. 1-6, is extracted important parameter and is obtained result as shown in table 1：
| Resonant frequency | Bandwidth | Relative bandwidth | Gain | |
| Comparative example 1 | 201.25MHz | 33.25MHz | 17% | -0.51dB |
| Embodiment 1 | 45.10MHz | 84.20MHz | 186.70% | 35.21dB |
| Embodiment 2 | 24.50MHz | 92.72MHz | 378.44% | 36.68dB |
Contrasted, can drawn by embodiment 1,2 and comparative example 1, the antenna that the present invention is provided, in low frequency (being less than 100MHz)
In section, resonant frequency, bandwidth, relative bandwidth and gain are significantly better than that existing monopole antenna.
Above-described is only that the known general knowledge such as concrete structure and characteristic is not made herein in embodiments of the invention, scheme
Excessive description., without departing from the structure of the invention, can be with it should be pointed out that for those skilled in the art
Several modifications and improvements are made, these should also be considered as protection scope of the present invention, these are implemented all without the influence present invention
Effect and practical applicability.The scope of protection required by this application should be based on the content of the claims, in specification
Embodiment etc. records the content that can be used for explaining claim.
Claims (6)
1. a kind of low frequency loaded antenna, including：
Feeder line is connected with monopole antenna, monopole antenna；
Characterized in that, also including：
Lump loading unit, lump loading unit is connected with monopole antenna；
Impedance transformation component, for realizing that the impedance of feed end of monopole antenna is equal to the characteristic impedance of feeder line；
Wherein, lump loading unit includes inductance and resistance, and inductance and resistance are connected with monopole antenna.
2. low frequency loaded antenna according to claim 1, it is characterised in that inductance is 1.73uH, resistance is 2.12k Ω.
3. low frequency loaded antenna according to claim 1, it is characterised in that also including sleeve, bush outer sleeve is in monopole
The top of antenna, the top of monopole antenna is connected with the inside of sleeve.
4. low frequency loaded antenna according to claim 1, it is characterised in that the inductance is variable inductor, the electricity
Hinder for slide rheostat.
5. low frequency loaded antenna according to claim 3, it is characterised in that inductance is 102.70nH, resistance is 420 Ω.
6. a kind of low frequency loaded antenna according to claim any one of 1-5, it is characterised in that the monopole antenna
Length is 360mm, and radius is 7.5mm, and radiation distance of the border away from antenna is 375mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710225713.1A CN107104271A (en) | 2017-04-07 | 2017-04-07 | A kind of low frequency loaded antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710225713.1A CN107104271A (en) | 2017-04-07 | 2017-04-07 | A kind of low frequency loaded antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107104271A true CN107104271A (en) | 2017-08-29 |
Family
ID=59675309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710225713.1A Pending CN107104271A (en) | 2017-04-07 | 2017-04-07 | A kind of low frequency loaded antenna |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006130159A2 (en) * | 2004-09-09 | 2006-12-07 | Bae Systems Information And Electronic Systems Integration Inc. | Broadband blade antenna assembly |
| CN102354794A (en) * | 2011-06-17 | 2012-02-15 | 电子科技大学 | Omnidirectional cylindrical dipole antenna for underground earth-probing radars |
| CN103259080A (en) * | 2012-02-15 | 2013-08-21 | 摩托罗拉解决方案公司 | Hybrid antenna for portable communication devices |
| CN203883127U (en) * | 2014-04-01 | 2014-10-15 | 刘扬 | Broadband antenna with resonance type feed structure |
| CN104347931A (en) * | 2013-08-05 | 2015-02-11 | 联想(北京)有限公司 | Adjustable multi-band antenna |
-
2017
- 2017-04-07 CN CN201710225713.1A patent/CN107104271A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006130159A2 (en) * | 2004-09-09 | 2006-12-07 | Bae Systems Information And Electronic Systems Integration Inc. | Broadband blade antenna assembly |
| CN102354794A (en) * | 2011-06-17 | 2012-02-15 | 电子科技大学 | Omnidirectional cylindrical dipole antenna for underground earth-probing radars |
| CN103259080A (en) * | 2012-02-15 | 2013-08-21 | 摩托罗拉解决方案公司 | Hybrid antenna for portable communication devices |
| CN104347931A (en) * | 2013-08-05 | 2015-02-11 | 联想(北京)有限公司 | Adjustable multi-band antenna |
| CN203883127U (en) * | 2014-04-01 | 2014-10-15 | 刘扬 | Broadband antenna with resonance type feed structure |
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Application publication date: 20170829 |