CN102881993A - Portable DNA simulation reconfigurable antenna - Google Patents
Portable DNA simulation reconfigurable antenna Download PDFInfo
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- CN102881993A CN102881993A CN2012102425350A CN201210242535A CN102881993A CN 102881993 A CN102881993 A CN 102881993A CN 2012102425350 A CN2012102425350 A CN 2012102425350A CN 201210242535 A CN201210242535 A CN 201210242535A CN 102881993 A CN102881993 A CN 102881993A
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Abstract
The invention discloses a portable DNA simulation reconfigurable antenna which structurally comprises a ground plate and an active helical metal wire connected with a feed circuit through the ground plate, and further comprises a parasitic helical metal wire which is coaxial with and has the same helical cylindrical surface with the active helical metal wire and is wound at the same helical angle together with the active helical metal wire; and a lumped element is arranged between the active helical metal wire and the parasitic helical metal wire. According to the reconfigurable antenna provided by the invention, through changing the type and the position of the lumped element, two main functions of wideband and work frequency point adjustability are realized. The antenna with different functions can be applied to a different antenna system; a double-helix structural antenna with wide wideband and high gain can be used for a radio receiving system; and the band width, gain, axial ratio and other indexes of the system can be optimized through adjusting the intensity or position of inductance; and the frequency adjustable double-helix antenna, which is realized through adding a capacitor, can be used for a radio transmitting terminal.
Description
Technical field
The present invention relates to a kind of antenna for telecommunications context, a kind of reconfigurable antenna of portable DNA emulation specifically, it can realize frequency reconfigurable.
Background technology
Antenna plays the important and pivotal role in wireless telecommunication system as a kind of parts that are used for transmitting and receiving radio wave, is indispensable part in the wireless communication system.Along with the develop rapidly of high frequency satellite communication system, radar, wireless communication system, particularly global 3G and 4G networking, more and more higher to the requirement of antenna.On the one hand, need antenna can be operated in a plurality of frequency bands, have multiple-working mode and have good conveying function; On the other hand, alleviate again antenna weight, reduce antenna volume and reduce cost, and one of preferred plan that restructural (reconfigurable) antenna is considered to address the above problem.Reconfigurable antenna is divided into frequency reconfigurable antenna (comprise and realize broadband and realize multiband), directional diagram reconstructable aerial, polarization reconfigurable antenna and many electromagnetic parameters reconfigurable antenna by function.Can make a kind of or concentrated realization reconstruct in the many kinds of parameters such as frequency, directional diagram, polarization mode of antenna by the structure that changes antenna.Can make antenna have multiple-working mode by the different conditions of switched antenna like this, be conducive in transmission, realize multiple effective diversity.
At present, the reconfigurable antenna of people's design totally can be divided into two large classes: a class is to realize frequency reconfigurable by the physical size of switch control radiant body, another kind of is to change the loaded impedance value of antenna under the control of switch, thereby its resonance frequency is dynamically changed.Although existing the whole bag of tricks can be realized frequency reconfigurable to a certain extent, in case their common shortcomings are that antenna is made, can only in several frequency ranges of design, adjust.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of reconfigurable antenna of portable DNA emulation, it adopts dual spiral antenna, by loading different lamped elements at diverse location, make easily the frequency reconfigurable antenna of wide bandwidth, high-gain aerial characteristic or frequency tunable characteristic.
For solving the problems of the technologies described above, the technical scheme that the present invention takes is:
A kind of reconfigurable antenna of portable DNA emulation, comprise ground plate in the structure and be connected the active helical metal wire that ground plate is connected with feed circuit, also comprise one with active helical metal wire coaxial, with the spiral circle cylinder, with the parasitic helical metal wire of helical angle coiling, between active helical metal wire and parasitic helical metal wire, be provided with lamped element.
Described parasitic helical metal wire is connected with ground plate by ground capacity.
Be α at the corresponding central angle of string on the normal plane of active helical metal wire axis, between active helical metal wire and the parasitic helical metal wire, and 0 °＜α≤180 °.
Preferred 30 ° ~ 120 ° of described α; More preferably α is 90 °.
Described lamped element is inductance or electric capacity.
The present invention is based on the inspiration of dna structure, turn to the double-spiral structure antenna of DNA emulation with wire, one of them spiral connects feed circuit as active helical metal wire, another is as parasitic helical metal wire, (following with reconfigurable antenna of the present invention referred to as the double-spiral structure antenna).For dual spiral antenna, since the close coupling between the double helix, the directivity of the antenna that can weaken, and the present invention loads lamped element between two strip metal conduction bands, changed the close coupling between the double helix, therefore, obtains the antenna of high-gain.When the kind that loads lamped element and position not simultaneously, obtain the antenna of different qualities: when loaded cable, obtain the antenna of wide bandwidth, high gain characteristics; When loading capacitance, by the vertical height of conversion electric capacity, can obtain the adjustable narrow-band antenna of frequency.
The beneficial effect that adopts technique scheme to produce is: (1) the present invention has started double-stranded reconfigurable antenna, by changing kind and the position of lamped element, can realize the reconfigurable antenna of adjustable two specific characters of broadband, high-gain and working frequency points; The antenna of above-mentioned realization different qualities can be applied in the different antenna systems: wherein the double-spiral structure antenna of wide bandwidth, high-gain can be used for radio receiving system, and the indexs such as the bandwidth of antenna, gain and axial ratio can be optimized by size or the position of adjusting inductance; The dual spiral antenna of the frequency tunable characteristic of realizing by loading capacitance is used for wireless transmitting terminal, and the operating frequency of antenna can be regulated continuously by the loading position that changes electric capacity; (2) the present invention is simple in structure, reconstruct is convenient, and the different conditions by switched antenna makes antenna have multiple-working mode, is conducive to realize in transmission multiple effective diversity; (3) antenna gain of two kinds of functions of the present invention is all very high, reaches more than the 6dB; (4) antenna of two kinds of functions of the present invention has all been realized circular polarization, is beneficial to transmitting and receiving of signal.
Description of drawings
Fig. 1 is the perspective view of double-spiral structure antenna of the present invention;
Fig. 2 is the single-screw antenna, not during loaded cable and the S11 curve of the double-spiral structure antenna behind the loaded cable;
Fig. 3 is the structural representation of match circuit;
Fig. 4 is double-spiral structure antenna loading inductance and the S11 curve when adopting match circuit among Fig. 3;
Gain curve when Fig. 5 is double-spiral structure antenna loading inductance;
Axial ratio curve when Fig. 6 is double-spiral structure antenna loading inductance;
S when Fig. 7 and Fig. 8 are double-spiral structure antenna loading electric capacity under the different vertical height
11Curve;
Fig. 9 is the S of 2.4GHz Imitating and test among the second embodiment
11Curve;
Figure 10 is gain curve among the second embodiment;
Figure 11 is the axial ratio curve of the second embodiment antenna;
Figure 12 and 13 is respectively the composition modular structure schematic diagram of receiving system and emission system;
Wherein, 1, active helical metal wire, 2, ground capacity, 3, parasitic helical metal wire, 4, ground plate, 5, lamped element, 6, through hole, 7, microstrip line, 8, microstrip line minor matters.
Embodiment
Referring to Fig. 1, a kind of frequency reconfigurable antenna that inspires based on DNA, comprise ground plate 4 in the structure and be connected the active helical metal wire 1 that ground connection 4 is connected with feed circuit, also comprise one 3 coaxial with active helical metal wire, with the spiral circle cylinder, with the parasitic helical metal wire 1 of helical angle coiling, between active helical metal wire 3 and parasitic helical metal wire 1, be provided with lamped element 5.Be that active helical metal wire 1 can be left-hand screw with parasitic helical metal wire 3 or be right-hand screw and identical, the coaxial setting of both structures, just the position of initiating terminal on ground plate 4 is different.
Described parasitic helical metal wire 3 is connected with ground plate 4 by ground capacity 2, described ground capacity 2 can take to realize the parts of capacitive function, such as adopting wooden unit in the present embodiment, upper surface and lower surface at wooden unit all cover sheet metal, the sheet metal of upper surface is connected with parasitic helical metal wire 3, and the sheet metal of lower surface is connected with ground plate 4.
Be α at the corresponding central angle of string on the normal plane of active helical metal wire (3) axis, between active helical metal wire (3) and the parasitic helical metal wire (1), and 0 °＜α≤180 °.The below gets 90 ° as example take α, and the performance of antenna of the present invention is described when putting down in writing different lamped elements with test data.
In the first embodiment of the present invention, the at first active helical metal wire of coiling 3 and parasitic helical metal wire 1, then such scheme is installed is positioned on the ground plate 4, wherein screw diameter is 26mm, highly be 126mm, pitch 45mm, diameter wiry are 2mm, and ground plate is that Rogers5880, thickness are 0.508mm.For experimental result there being more intuitively understanding, made traditional single-screw antenna, its screw diameter is 40mm, highly is 150mm, the theoretical work frequency is 2.4GHz.Test respectively the single-screw antenna, not during loaded cable and the S11 curve of the double-spiral structure antenna behind the loaded cable, referring to Fig. 2.As can be seen from the figure, the double-spiral structure antenna bandwidth of operation of loaded cable is also not narrower than traditional single-screw beamwidth of antenna, and the remarkable broadening of bandwidth ratio single-screw antenna of the double-spiral structure antenna behind the loaded cable.
Double-spiral structure antenna of the present invention or a brand-new field, there is not suitable match circuit, present embodiment has designed a kind of match circuit, see Fig. 3, comprise the microstrip line 7 and two fan-shaped offset of microstrip line minor matters 8 that are arranged on microstrip line 7 one sides of cascade in its circuit structure, its effect is: extremely very little the compensation of the imaginary part of the input impedance of antenna first, but its numerical value is very large, about about 150 ohm, be matched to 50 ohm by fan-shaped offset of microstrip line minor matters and microstrip line more greatly.Fan-shaped offset of microstrip line minor matters are Broadband Matching, so kept the broadband character of antenna.This match circuit is etched on the bottom surface of ground plate 4, and is communicated with active helical metal wire 3 by the through hole 6 of the metallic walls on the ground plate 4.After adopting this match circuit, S
11The simulation of curve, referring to Fig. 4, as can be seen from the figure, and behind the employing match circuit, the remarkable broadening of the bandwidth of operation of antenna.Prove absolutely that double-spiral structure antenna of the present invention also has huge potential in the wide bandwidth field of antenna.
For traditional single-screw antenna, when the diameter of spiral or height change, bandwidth of operation increases, gain reduces, and vice versa; This means, when designing antenna, be difficult to accomplish that bandwidth and gain improve simultaneously.For the double-spiral structure antenna of loaded cable, gain and bandwidth all can improve.Referring to Fig. 5, dash area represents bandwidth of operation, is 2.8, highly is the dual spiral antenna of 126mm that the gain of 2.0GHz reaches 7.6bB for the spiral number, is a relatively high yield value, and bandwidth of operation also wider (be 1.8 ~ 3.6GHz).Fig. 6 is the axial ratio curve of present embodiment, as can be seen from the figure, in 2.2 ~ 3.6GHz scope, has good circular polarization characteristics.
When research single-screw antenna, the researcher usually concentrates on energy on the bandwidth characteristic, seldom notes the characteristic that frequency is adjustable.As second embodiment of the invention, when on different positions, during loading capacitance, obtaining the antenna of different operating frequency between two spirals.
What the skeleton of double-spiral structure antenna was different from above-described embodiment in the present embodiment is: need not match circuit.
The electric capacity level is carried between active helical metal wire 1 and the parasitic helical metal wire 3, and described electric capacity adopts 15pF, constantly adjusts the vertical height of electric capacity, and test S
11Curve is referring to figure Fig. 7 and Fig. 8.As can be seen from the figure, when electric capacity was arranged on the different vertical height, the operating frequency of antenna was different, and adjustable frequency range is 2 ~ 5.5GHz; In test process, find outside this frequency range, to also have other operating frequency, just the bandwidth relative narrower.The vertical height liftoff along with electric capacity reduces, and operating frequency increases gradually, such as, the operating frequency of electric capacity at liftoff 33mm place is 2.6GHz, the operating frequency at liftoff 11mm place is 4.2GHz.Utilize this rule in working frequency range, to regulate by arbitrary frequency.
Take operating frequency as example as 2.4GHz, relatively S
11Simulation curve and test curve,, can find out that the bandwidth of operation of simulation is 2.07 ~ 2.45 referring to Fig. 9, the bandwidth of actual measurement is 2.27 ~ 2.67, the goodness of fit of two curves is very high.Therefore, after antenna prepares, can pass through software simulation, select operating frequency.
Figure 10 is the gain curve of present embodiment antenna, and yield value is little than above-described embodiment, but in most of operating frequency, yield value is up to 5dB.
Figure 11 is the axial ratio characteristic of present embodiment antenna.Dash area is bandwidth of operation among the figure, and as seen, in bandwidth of operation, antenna is circular polarization characteristics.
Utilize double-spiral structure antenna of the present invention, set up cover radio transmission and a receiving system, be used for transmitting one group of vision signal.Described radio transmitting system (Emission System) comprise camera, modulation module, radio-frequency (RF) mixer module, power amplifier module and and transmitting antenna, referring to Figure 12.Modulation module, radio-frequency (RF) mixer module and power amplifier module are integrated on the printed circuit board.
Receiving system (Receiving System) is comprised of 7 parts: reception antenna, low noise amplifier (Low Noise Amplifier, LNA), lower conversion mixes module, demodulation module, vision signal output module, AV are to USB transducer and computer, referring to Figure 13.Wherein low noise amplifier, lower conversion mixes module and demodulation module are integrated on the printed circuit board.
Carry out the transmission of video test in clearing, the distance that receiving system and emission system are placed is at a distance of about 130m.Result of the test shows that vision signal is good, picture is clear.
Claims (8)
1. the reconfigurable antenna of a portable DNA emulation, comprise ground plate (4) in the structure and be connected the active helical metal wire (3) that ground plate (4) is connected with feed circuit, characterized by further comprising one with active helical metal wire (3) coaxial, with the spiral circle cylinder, with the parasitic helical metal wire (1) of helical angle coiling, between active helical metal wire (3) and parasitic helical metal wire (1), be provided with lamped element (5).
2. the reconfigurable antenna of portable DNA emulation according to claim 1 is characterized in that described parasitic helical metal wire (1) is connected with ground plate (4) by ground capacity (2).
3. the reconfigurable antenna of portable DNA emulation according to claim 1, it is characterized in that at the corresponding central angle of string on the normal plane of active helical metal wire (3) axis, between active helical metal wire (3) and the parasitic helical metal wire (1) be α, and 0 °＜α≤180 °.
4. the reconfigurable antenna of portable DNA emulation according to claim 3 is characterized in that 30 °≤α≤120 °.
5. the reconfigurable antenna of portable DNA emulation according to claim 4 is characterized in that α is 90 °.
6. the reconfigurable antenna of portable DNA emulation according to claim 1 is characterized in that described lamped element (5) is inductance or electric capacity.
7. the reconfigurable antenna of portable DNA emulation according to claim 6 when it is characterized in that described lamped element is inductance, is provided with match circuit between feed circuit and active helical metal wire (1).
8. the reconfigurable antenna of portable DNA emulation according to claim 7 is characterized in that described match circuit comprises the microstrip line and two fan-shaped offset of microstrip line minor matters that are arranged on microstrip line one side of cascade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210242535.0A CN102881993B (en) | 2012-07-13 | 2012-07-13 | Portable DNA simulation reconfigurable antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210242535.0A CN102881993B (en) | 2012-07-13 | 2012-07-13 | Portable DNA simulation reconfigurable antenna |
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| CN102881993A true CN102881993A (en) | 2013-01-16 |
| CN102881993B CN102881993B (en) | 2014-09-03 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393400B (en) * | 2014-11-25 | 2017-02-22 | 重庆大学 | Circular polarization frequency express substation small antenna based on capacitive loading parasitic ring |
| CN106549214A (en) * | 2015-09-18 | 2017-03-29 | 深圳市华信天线技术有限公司 | Double-frequency broadband four-arm spiral antenna |
| CN107706505A (en) * | 2017-11-10 | 2018-02-16 | 深圳市盛路物联通讯技术有限公司 | Position antenna assembly and mobile terminal |
| CN110749883A (en) * | 2019-12-23 | 2020-02-04 | 浙江科技学院 | Traffic speed measuring radar for highway |
| CN110994157A (en) * | 2019-12-23 | 2020-04-10 | 浙江科技学院 | Vortex-shaped array antenna of double-helix phase-shifting unit |
Citations (4)
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| JP2002118408A (en) * | 2000-10-06 | 2002-04-19 | Nippon Antenna Co Ltd | Shared antenna for multifrequencies |
| KR20050053929A (en) * | 2003-12-03 | 2005-06-10 | 주식회사 팬택 | Multiband helical antenna using dual coil |
| CN101154762A (en) * | 2006-09-29 | 2008-04-02 | 香港城市大学 | Double-ellipse helical antenna |
| CN201450105U (en) * | 2009-08-27 | 2010-05-05 | 西安阿特纳电子科技有限公司 | Vehicle-mounted Beidou antenna device |
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2012
- 2012-07-13 CN CN201210242535.0A patent/CN102881993B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002118408A (en) * | 2000-10-06 | 2002-04-19 | Nippon Antenna Co Ltd | Shared antenna for multifrequencies |
| KR20050053929A (en) * | 2003-12-03 | 2005-06-10 | 주식회사 팬택 | Multiband helical antenna using dual coil |
| CN101154762A (en) * | 2006-09-29 | 2008-04-02 | 香港城市大学 | Double-ellipse helical antenna |
| CN201450105U (en) * | 2009-08-27 | 2010-05-05 | 西安阿特纳电子科技有限公司 | Vehicle-mounted Beidou antenna device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393400B (en) * | 2014-11-25 | 2017-02-22 | 重庆大学 | Circular polarization frequency express substation small antenna based on capacitive loading parasitic ring |
| CN106549214A (en) * | 2015-09-18 | 2017-03-29 | 深圳市华信天线技术有限公司 | Double-frequency broadband four-arm spiral antenna |
| CN107706505A (en) * | 2017-11-10 | 2018-02-16 | 深圳市盛路物联通讯技术有限公司 | Position antenna assembly and mobile terminal |
| CN110749883A (en) * | 2019-12-23 | 2020-02-04 | 浙江科技学院 | Traffic speed measuring radar for highway |
| CN110749883B (en) * | 2019-12-23 | 2020-04-07 | 浙江科技学院 | Traffic speed measuring radar for highway |
| CN110994157A (en) * | 2019-12-23 | 2020-04-10 | 浙江科技学院 | Vortex-shaped array antenna of double-helix phase-shifting unit |
| CN110994157B (en) * | 2019-12-23 | 2021-11-05 | 浙江科技学院 | Vortex-shaped array antenna of double-helix phase-shifting unit |
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| CN102881993B (en) | 2014-09-03 |
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