CN201918504U - Miniaturized dual-frequency antenna - Google Patents
Miniaturized dual-frequency antenna Download PDFInfo
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- CN201918504U CN201918504U CN 201020638568 CN201020638568U CN201918504U CN 201918504 U CN201918504 U CN 201918504U CN 201020638568 CN201020638568 CN 201020638568 CN 201020638568 U CN201020638568 U CN 201020638568U CN 201918504 U CN201918504 U CN 201918504U
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Abstract
The utility model provides a miniaturized dual-frequency antenna which comprises a medium substrate and a monopole antenna printed on the medium substrate, wherein the monopole antenna comprises a main radiating element, a coplanar waveguide feed signal strip line connected with the main radiating element, a coplanar waveguide grounding plane, and an auxiliary radiating element between the main radiating element and the coplanar waveguide grounding plane, wherein the main radiating unit is a U-shaped radiating element, the lower end of the coplanar waveguide feed signal strip line is connected with an inner conductor of an SMA, and an outer conductor of the SMA is connected with the coplanar waveguide grounding plane. The miniaturized dual-frequency antenna can be used for receiving and emitting radio waves. The miniaturized dual-frequency antenna can be used for terminals for electronic reconnaissance and electronic countermeasure, tracking and electromagnetic protection, and receiving equipment of wireless local area networks and a global microwave access terminal. The miniaturized dual-frequency antenna has a simple structure, wide working bandwidth, and low cost, and is convenient for batch production.
Description
Technical field
The utility model relates to a kind of antenna.Specifically a kind of compact dual-frequency antenna can be used for accepting and emitting radio wave.
Background technology
Because radio communication equipment and electronic message unit be towards multifunction, miniaturization, ultra broadband and the friendly direction of coordinating with surrounding environment develop, and this makes broadband, miniaturization, high-gain becomes one of hot subject of domestic and international research.In recent years, do not need to hole and be easy to integrated coplanar waveguide structure and make rapid progress, and this structure can be by taking a picture or photoetching technique is made, and polarization characteristic is preferably arranged, so in the design of the design that has been applied in broad-band antenna of this technology and relevant microwave circuit components and parts.And in most cases present, need common antenna can satisfy the demand of multiband simultaneously, the impedance bandwidth of broad will be arranged simultaneously, can satisfy the demand of broadband connections simultaneously.Particularly in the past few years, develop rapidly along with wireless communication technology, WLAN popularizes widely, but as Wimax also in continuous popularization, a lot of scholar both domestic and external and company all have the antenna of double frequency in research, can satisfy simultaneously the design requirement of miniaturization, be convenient to the integrated and miniaturization Design of equipment.Solve some shortcomings of existing dual-band antenna simultaneously: what (1) present double frequency band aerial great majority adopted is the form of monopole antenna and sleeve antenna, but the feeding classification more complicated of these antenna is not easy to actual debugging and production; (2) present most of a kind of compact dual-frequency antennas, it all is the bending distortion of the monopole antenna of employing, or adopt nonplanar structure, the design and installation of the system of giving bring certain degree of difficulty, be not easy to consider its electromagnetic compatibility characteristic simultaneously, be the version of on-plane surface because of what adopt again, therefore be not easy to the integrated and miniaturization Design of system; (3) present double frequency band aerial, great majority are that bandwidth is narrow, can not satisfy the broadband demand of present equipment, each general bandwidth all more than million, therefore needs a kind of dual-band antenna with wider bandwidth of design at hundreds of; (4) in recent years, the great majority that academia proposes have the antenna of dual frequency characteristics, mostly are the forms that adopts many resonant elements, generally can be that antenna volume increases, and are constant in miniaturization Design.
Document " Electromagnetically coupled WLAN/WiMax antenna; M.Bashri; Ch.Ghobadi; M.Kamyab Hesari; and J.Nourinia; IEICE Electronics Express, Vol.7, No.13,2010. " a kind of dual-band antenna with coupled structure is proposed, this antenna still has bigger volume and complicated structure; though utilize the method for coupling to produce the double frequency bandwidth in the literary composition; but this antenna adopts the structure of two-sided coupling, has increased the complexity of antenna, is unfavorable for the integrated of antenna and system.Document " Band-notched design of the planar monopole antenna forWLAN/WiMax applications; Kang-kang Chen; and Ji-xiang Zhao; Microwave And OpticalTechnology Letters, Vol.52, No.12; 2010 " proposes the characteristic of the method realization double frequency impedance bandwidth of employing etching rectangular channel on radiating element, but size is bigger, adopts oval-shaped ground-plane design simultaneously, debugging inconvenience.Chinese patent " double-frequency slotted antenna; application number 200510004103.6 " has been set forth the dual-band antenna of fluting, this antenna adopts the structure of opening different grooves in different resonance frequencys, adopt coaxial cable feed simultaneously, but the limited bandwidth of this antenna, and constant miniaturization in antenna and system and integrated.Chinese patent " double frequency single dipole antenna; application number: 02102397.2 " is set forth a kind of dual-band antenna design of lamination, this patent mainly is to print different chip units on different dielectric layers, thereby produce different resonance points, but the structure of antenna is relatively complicated, bandwidth is narrow simultaneously, can not satisfy the broadband connections demand of present stage and the application of the integrated design of miniaturization.Chinese patent " double-band printed antenna; application number: 200710154359.4 ", this dual-band antenna still adopt the form of laminated construction and punching to form dual frequency characteristics, not only increase the complexity of antenna, can cause the electromagnetic leakage of part owing to punching simultaneously, thereby influence the radiation characteristic of antenna.Document " Printed modified loopantenna for WLAN/WiMax applications; C.M.Peng; I.F.Chen; J.J.Yeh and C.W.Hsue, Electronics Letters, Vol.43; No.5; 2007 " proposes a kind of annular double-frequency micro-strip antenna, but the smaller bandwidth of this antenna can not satisfy the demand of broadband connections.
Summary of the invention
The purpose of this utility model be to provide a kind of simple in structure, the work zone is wide, be convenient to produce in batches, and compact dual-frequency antenna with low cost.
The purpose of this utility model is achieved in that
It comprises medium substrate and the monopole antenna that is printed on the medium substrate, coplanar wave guide feedback signal band line, co-planar waveguide ground plane and the auxilliary radiating element between primary radiation unit and co-planar waveguide ground plane that described monopole antenna comprises the primary radiation unit, links to each other with the primary radiation unit, described primary radiation unit is the U-shaped radiating element, the lower end of coplanar wave guide feedback signal band line is connected with the SMA inner wire, and the outer conductor of SMA ground roll together connects the ground connection.
The utility model can also comprise:
1, is connected with tuning microstrip line on the primary radiation unit.
2, described auxilliary radiating element is two U-shaped coupled radiation units.
3, described auxilliary radiating element is two and falls L shaped parasitic radiation unit.
4, the described tuning microstrip line microstrip line that is rectangular configuration or the microstrip line of I shape structure.
In order to adopt single plane printed antenna structure, and can satisfy the impedance operator demand of double frequency simultaneously, the utility model adopts following several measures:
1, adopt tuning microstrip line of insertion between the U-shaped radiation element, length and width by adjusting tuning microstrip line change its distributed capacitance and distributed inductance, thereby increase the impedance bandwidth of antenna.
2, the mode of employing parasitic couplings realizes the work of double frequency-band, by the slit of change parasitic couplings and the length and the width of parasitic radiation unit, changes the impedance bandwidth and the resonance point of parasitic frequency, thereby realizes broadband operation.
3, adopt the structure of U radiating element, be similar to the form of microstrip dipole, but the form of U-shaped radiating element has effectively changed the size that has reduced antenna, is convenient to the small design of system.
4, utilize the form of co-planar waveguide to realize single plane printed antenna structure, also be convenient to microwave integrated circuit integrated simultaneously.
Use the advantage of coplanar waveguide structure:
1, adopts coplanar waveguide structure, can realize single plane printed antenna structure.
2, adopt coplanar waveguide structure, can be integrated with microwave integrated circuit easily.
3, adopt coplanar waveguide structure, the ground plane of co-planar waveguide can serve as the ground plane of entire antenna, not only can realize wideband operation, and also can effectively avoid the electromagnetic interference of outer this antenna of bound pair.
4, adopt coplanar waveguide structure can realize broadband impedance bandwidth easily, and help improving the efficient of antenna, thereby obtain higher antenna gain.
According to the advantage and the technical thought of above co-planar waveguide, the technical solution adopted in the utility model is:
1, radiating element adopts the U-shaped paster, is similar to the dipole antenna of bending, be convenient to design and make, and the radiating element size is less, is convenient to the miniaturization of system and is easy to microwave integrated circuit integratedly, can realize the broadband impedance matching simultaneously.
2, adopt the method for between the U radiating element, inserting a tuning microstrip line, by length and the width that changes tuning microstrip line, change the distributed capacitance and the distributed inductance of tuning microstrip line, thereby influence the resonance performance of antenna, change its sense of current, increase the impedance bandwidth of antenna.
3, feed structure is the coplanar wave guide feedback structure, is made up of co-planar waveguide ground plane and coplanar wave guide feedback signal band line, and it is integrated in radio-frequency front-end to be convenient to antenna like this, can well realize the miniaturization of equipment and system simultaneously.
4, the both sides of the coplanar wave guide feedback signal band line between co-planar waveguide ground plane and U-shaped radiating element increase by two U-shaped coupled radiation units respectively, by changing the size and the distance of U coupled radiation unit between coplanar wave guide feedback signal band line of U-shaped coupled radiation unit, also can regulate simultaneously the coupling slit between U-shaped coupled radiation unit and U-shaped radiating element and the co-planar waveguide ground plane, regulate the impedance bandwidth of antenna.
The utility model compared with prior art has significant advantage to be:
1, the utility model can be realized wideer impedance bandwidth, this antenna is at the U-shaped radiating element, be similar to the form of traditional dipole antenna, but the size of this antenna is compared with the bending dipole with traditional dipole, the size of antenna reduces greatly, so that this antenna can be installed in the internal system of miniaturization, realize the miniaturization Design of complete machine.
2, the designed compact dual-frequency antenna of the utility model is printed on the same one side of medium substrate, adopt the U-shaped radiating element, effectively reduce the section of antenna, adopt the coplanar wave guide feedback mode simultaneously, be convenient to integrated with the microwave radio front end, and then reduce the volume of system.
3, adopt the method for between the U-shaped radiating element, inserting a tuning microstrip line, by regulating the length and the width of microstrip line, and then change distributed inductance and distributed capacitance, make designed antenna can be well and system mate, thereby the realization The Wide-Band Design.
4, the utility model adopts the technology of coupling, the increase pair of U-shaped coupled radiation unit of the both sides symmetry of the coplanar wave guide feedback signal band line between co-planar waveguide ground plane and U-shaped radiating element, by changing the size of U-shaped coupled radiation unit, U-shaped coupled radiation unit and U-shaped radiating element, U-shaped coupled radiation unit and co-planar waveguide electric feed signal band line, U-shaped coupled radiation unit ground roll together connects distance between the ground, change the parasitic capacitance and the coupling inductance of various piece, and then the impedance bandwidth and the resonance characteristic of change entire antenna, make designed antenna can be tuned at different frequency ranges.
5, the multinomial technology that antenna adopted effectively increases the bandwidth of antenna and the section of antenna, and this antenna can also adopt the form of inserting many resonance radiation unit between co-planar waveguide ground plane and U-shaped radiating element simultaneously, realizes the multiband design.
Compact dual-frequency antenna of the present utility model, the main U-shaped radiating element that adopts at coplanar wave guide feedback respectively has a U-shaped coupled radiation unit in the both sides of coplanar wave guide feedback signal band line, produces two thus and thanks to vibration frequency, thereby realize dual-band operation.Between two arms of U-shaped radiating element, insert a tuning microstrip line, change the distributed capacitance and the distributed current of antenna, thereby the impedance bandwidth of regulating antenna realizes broadband operation.This antenna line simple in structure, the work zone is wide, be convenient to produce in batches, and with low cost.The utility model can be used for electronic reconnaissance and electronic countermeasures, and the terminal of tracking and electromagnetic protection is on WLAN (wireless local area network) and the global inserting of microwave terminal receiving equipment.
Description of drawings
Fig. 1 is the basic structure schematic diagram of first kind of execution mode of the present utility model;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the return loss plot of first kind of execution mode of the utility model of test;
Fig. 4 is the H surface radiation directional diagram of first kind of execution mode 3.5GHz of test;
Fig. 5 is first kind of execution mode 4.5GHz face H surface radiation directional diagram of test;
Fig. 6 is first kind of execution mode 5.5GHz face H surface radiation directional diagram of test;
Fig. 7 is the E surface radiation directional diagram of first kind of execution mode 3.5GHz of test;
Fig. 8 is first kind of execution mode 4.5GHz face E surface radiation directional diagram of test;
Fig. 9 is first kind of execution mode 5.5GHz face E surface radiation directional diagram of test;
Figure 10 is the basic structure schematic diagram of second kind of execution mode of the present utility model;
Figure 11 is the standing wave curve of second kind of execution mode of the utility model.
Embodiment
Giving an example below in conjunction with accompanying drawing, this is done in more detail utility model and describes:
Embodiment one:
An example of the present utility model as depicted in figs. 1 and 2.It has medium substrate 106, U-shaped radiating element 101, coplanar wave guide feedback signal band line 103, tuning microstrip line 105, and U-shaped coupled radiation unit 102 and co-planar waveguide ground plane 104 are formed.The lower end of the coplanar wave guide feedback signal band line 103 of this antenna is connected with the SMA inner wire.The outer conductor of SMA ground roll together connects ground 104 connections.According to structure illustrated in figures 1 and 2,, just can realize the design of double frequency impedance bandwidth as long as select suitable dimensions.
The setting of parameter:
1, tuning microstrip line
Tuning microstrip line can change the distributed capacitance and the distributed inductance of antenna effectively, makes designed antenna can satisfy wide band communication requirement.The utility model adopts the tuning microstrip line of terminal open circuit, and by changing resistance and the electric capacity that its length and width change its distribution, its equivalence is a LC resonant circuit.
Based on needs of the present utility model, the length of U-shaped radiating element is about the half-wavelength of resonance frequency, so the wavelength of resonance frequency can be expressed as:
Wherein c is the light velocity, f
CenBe the centre frequency of resonant bandwidth, effective dielectric constant ε
Eff≈ (ε
r+ 1)/2, ε
rBe the relative dielectric constant of medium, L
CenWavelength for the resonant bandwidth centre frequency.
2, the design of U-shaped coupled radiation unit
The U-shaped coupled radiation unit produces the another one resonance frequency, because of it is in the both sides of coplanar wave guide feedback line, by the energy on the coupling coplanar wave guide feed line to U-shaped coupled radiation unit, therefore produce the another one resonance point, be similar to the form of parasitic dipoles, therefore also can go out initial size by what formula (1) calculated, and then the size that needing to obtain by optimization more.
3, the design of co-planar waveguide
Entire antenna is 50 Ω in the impedance of the feed structure of co-planar waveguide, and the ground plane of co-planar waveguide adopts the structure around radiation patch, therefore partly adopts inconsistent width at mid portion and upper and lower side, is of value to the coupling of impedance.The slit of the conduction band width of the impedance of co-planar waveguide and co-planar waveguide electric feed signal band line 103 and length and co-planar waveguide ground plane 104 and radiating element, the thickness and the dielectric constant of medium substrate 106 are relevant, as long as change a parameter, and the just characteristic impedance of energy line on another day of other parameter inconvenience.Can also utilize computing formula commonly used to calculate the characteristic impedance of co-planar waveguide for this reason.
4, the selection of medium substrate
Generally between 2-9.8, the dielectric constant that the utility model adopts is 2.65 polyfluortetraethylene plate to the dielectric constant of medium substrate, and this substrate price is lower, and loss is less, based on above-mentioned requirements.In practice, can adopt the little medium substrate of dielectric constant loss angle according to practical application, as the substrate of dielectric constant loss angle less than 10-2.The thickness of the medium substrate that the utility model adopts is 1.6mm, satisfies required intensity.
5, the jointing of antenna can adopt N connector or sub-miniature A connector, will select according to producing.
The energy of signal is delivered to the U-shaped radiating element by co-planar waveguide signal band bundle of lines energy, energy is coupled to portion of energy on the U-shaped coupled radiation unit between U-shaped radiating element and co-planar waveguide ground plane simultaneously, thereby generation dual frequency characteristics, in order further to optimize designed antenna, be convenient to the bandwidth that provides enough, satisfy the application demand of WLAN (5.15GHz-5.825GHz) and WiMax (3.5GHz).The utility model inserts the tuning microstrip line of open circuit between the U-shaped radiating element, by regulating its degree and width, change the whole matching characteristic of antenna, thereby produces wideer impedance bandwidth.
Fig. 3 is the return loss plot of test, from the figure as can be seen standing-wave ratio (≤2: 1) be return loss＜-impedance bandwidth of 10dB is 2.7-6GHz, satisfy the demand of broadband connections, can satisfy the application demand of WLAN (5.15GHz-5.825GHz) and WiMax (3.5GHz) simultaneously.Fig. 4-Fig. 9 is the antenna pattern of this antenna, and this antenna has good omnidirectional radiation characteristic as can be seen.
Embodiment 2:
As shown in figure 10, another kind of embodiment of the present utility model is to use two to fall L shaped parasitic radiation unit between the U-shaped radiating element of this antenna and co-planar waveguide ground plane, by changing its size, can effectively change the CURRENT DISTRIBUTION of antenna surface, thereby change the resonant bandwidth of antenna, realize dual frequency operation.This antenna radiation unit 201, coplanar wave guide feedback signal band line 203, fall L shaped parasitic radiation unit 202, co-planar waveguide ground plane 204 is formed.It is on 2.65 the medium substrate that entire antenna is printed on dielectric constant.The lower end of the coplanar wave guide feedback signal band line 203 of this antenna is connected with the SMA inner wire.The outer conductor of SMA ground roll together connects ground 204 connections.According to structure shown in Figure 10,, just can satisfy its wideband operation characteristic and dual frequency characteristics as long as select suitable dimensions.Figure 11 is the return loss test curve of this antenna.
Claims (6)
1. compact dual-frequency antenna, it comprises medium substrate and the monopole antenna that is printed on the medium substrate, it is characterized in that: coplanar wave guide feedback signal band line, co-planar waveguide ground plane and the auxilliary radiating element between primary radiation unit and co-planar waveguide ground plane that described monopole antenna comprises the primary radiation unit, links to each other with the primary radiation unit, described primary radiation unit is the U-shaped radiating element, the lower end of coplanar wave guide feedback signal band line is connected with the SMA inner wire, and the outer conductor of SMA ground roll together connects the ground connection.
2. a kind of compact dual-frequency antenna according to claim 1 is characterized in that: described auxilliary radiating element is two U-shaped coupled radiation units.
3. a kind of compact dual-frequency antenna according to claim 1 is characterized in that: described auxilliary radiating element is two and falls L shaped parasitic radiation unit.
4. according to claim 1,2 or 3 described a kind of compact dual-frequency antennas, it is characterized in that: be connected with tuning microstrip line on the primary radiation unit.
5. according to claim 1,2 or 3 described a kind of compact dual-frequency antennas, it is characterized in that: the microstrip line of microstrip line that described tuning microstrip line is a rectangular configuration or I shape structure.
6. a kind of compact dual-frequency antenna according to claim 4 is characterized in that: the microstrip line of microstrip line that described tuning microstrip line is a rectangular configuration or I shape structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201020638568 CN201918504U (en) | 2010-12-02 | 2010-12-02 | Miniaturized dual-frequency antenna |
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| CN 201020638568 CN201918504U (en) | 2010-12-02 | 2010-12-02 | Miniaturized dual-frequency antenna |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005645A (en) * | 2010-12-02 | 2011-04-06 | 哈尔滨工程大学 | Miniaturized dual-frequency antenna |
| CN103474767A (en) * | 2013-09-18 | 2013-12-25 | 中国科学院长春光学精密机械与物理研究所 | Four-frequency plane microstrip antenna with miniaturized microwave absorption structure |
| CN103531908A (en) * | 2013-10-30 | 2014-01-22 | 电子科技大学 | Multiband plane printed antenna |
| CN105024152A (en) * | 2015-07-01 | 2015-11-04 | 成都众易通科技有限公司 | Automobile Bluetooth signal transmitting and receiving device |
| CN103490155B (en) * | 2013-09-24 | 2016-03-30 | 西安电子科技大学 | A kind of four frequency range printed antennas being applied to radio communication |
| CN108054519A (en) * | 2017-12-06 | 2018-05-18 | 哈尔滨工程大学 | A kind of wideband directional millimeter wave antenna |
| CN110596464A (en) * | 2019-10-22 | 2019-12-20 | 中国电子科技集团公司信息科学研究院 | Electromagnetic parameter measuring system and method |
| CN113131178A (en) * | 2019-12-30 | 2021-07-16 | 杭州海康威视数字技术股份有限公司 | Direction-finding antenna, direction-finding antenna system and electronic equipment |
| CN113839187A (en) * | 2021-09-17 | 2021-12-24 | 长沙理工大学 | High-gain double-frequency microstrip antenna with parasitic element loaded |
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2010
- 2010-12-02 CN CN 201020638568 patent/CN201918504U/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005645B (en) * | 2010-12-02 | 2013-02-06 | 哈尔滨工程大学 | Miniaturized dual-frequency antenna |
| CN102005645A (en) * | 2010-12-02 | 2011-04-06 | 哈尔滨工程大学 | Miniaturized dual-frequency antenna |
| CN103474767A (en) * | 2013-09-18 | 2013-12-25 | 中国科学院长春光学精密机械与物理研究所 | Four-frequency plane microstrip antenna with miniaturized microwave absorption structure |
| CN103474767B (en) * | 2013-09-18 | 2015-02-18 | 中国科学院长春光学精密机械与物理研究所 | Four-frequency plane microstrip antenna with miniaturized microwave absorption structure |
| CN103490155B (en) * | 2013-09-24 | 2016-03-30 | 西安电子科技大学 | A kind of four frequency range printed antennas being applied to radio communication |
| CN103531908A (en) * | 2013-10-30 | 2014-01-22 | 电子科技大学 | Multiband plane printed antenna |
| CN105024152A (en) * | 2015-07-01 | 2015-11-04 | 成都众易通科技有限公司 | Automobile Bluetooth signal transmitting and receiving device |
| CN108054519A (en) * | 2017-12-06 | 2018-05-18 | 哈尔滨工程大学 | A kind of wideband directional millimeter wave antenna |
| CN108054519B (en) * | 2017-12-06 | 2020-07-28 | 哈尔滨工程大学 | Broadband directional millimeter wave antenna |
| CN110596464A (en) * | 2019-10-22 | 2019-12-20 | 中国电子科技集团公司信息科学研究院 | Electromagnetic parameter measuring system and method |
| CN113131178A (en) * | 2019-12-30 | 2021-07-16 | 杭州海康威视数字技术股份有限公司 | Direction-finding antenna, direction-finding antenna system and electronic equipment |
| CN113131178B (en) * | 2019-12-30 | 2022-09-27 | 杭州海康威视数字技术股份有限公司 | Direction-finding antenna, direction-finding antenna system and electronic equipment |
| CN113839187A (en) * | 2021-09-17 | 2021-12-24 | 长沙理工大学 | High-gain double-frequency microstrip antenna with parasitic element loaded |
| CN113839187B (en) * | 2021-09-17 | 2023-08-22 | 长沙理工大学 | Parasitic unit loaded high-gain double-frequency microstrip antenna |
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