CN1233068C - Horizontal polarization hyperfrequency band high-gain minitype flat printing isotropic antenna - Google Patents
Horizontal polarization hyperfrequency band high-gain minitype flat printing isotropic antenna Download PDFInfo
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- CN1233068C CN1233068C CN 03141791 CN03141791A CN1233068C CN 1233068 C CN1233068 C CN 1233068C CN 03141791 CN03141791 CN 03141791 CN 03141791 A CN03141791 A CN 03141791A CN 1233068 C CN1233068 C CN 1233068C
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Abstract
The present invention relates to a minitype plane printing omnidirectional antenna of horizontal polarization, ultra-high frequency band and high gain. A printed planar antenna structure mixed by a radiation part and a feeding part is formed by combining coplanar waveguides and trough lines. The antenna and the feeding structure thereof are composed of two vertically cross coplanar waveguides, four trough lines which are connected with ports of the coplanar waveguides, and four tilting coplanar waveguides which are formed by that the endpoints of every two trough lines are bent and the terminals of the tilting coplanar waveguides are shorted circuit. The antenna is excited by a coaxial cable which is connected with a center point which is crossed at the coplanar waveguides. Parasitic trough lines can be placed in parallel on the outer side of each trough line, and the terminals of the tilting coplanar waveguides are connected with capacitance for further enhancing the radiation efficiency and the antenna gain. The antenna of the present invention realizes horizontal polarization and can be used in the reception of a mobile digital television along the omnidirectional radiation in the plane of a base plate. The present invention can be especially used for various vehicle-mounted mobile television receiving systems limited by dimensions and installation conditions.
Description
Technical field:
The present invention relates to a kind of small-sized horizontally-polarized antenna, relate in particular to a kind of horizontal polarization hyperfrequency (UHF) waveband high-gain small-sized plane printing omnidirectional antenna, be used for multimedia digital communication.
Background technology:
At present, with the mobile communication be representative radio communication development rapidly.Along with the raising of requirements such as message capacity, quality, content and the development of integrated circuit technique, the multimedia digital communication mode more and more is subject to people's attention, and moving reception simultaneously becomes one of main communication mode because of its demand that greatly satisfies the user.Thereby more and more higher requirement has been proposed also reception antenna.After for example Digital Television starts broadcasting, bus, all kinds of cars etc. all will be one of main users.Horizontal polarization mode is mostly adopted in China's transmission of television, and therefore researching and developing small-sized horizontal polarization UHF isotropic receiving antenna becomes the task of top priority.Simultaneously this class antenna also is the key component that adopts mobile unit in the communication system of horizontal polarization.
Antenna form is thousands of, but small-sized horizontal polarization UHF omnidirectional antenna is a difficult point in the Antenna Design always.Principal contradiction is to require to realize that at the UHF wave band horizontal polarization omnidirectional receives under geometric parameter that limits and physical condition.The cross batwing antenna has the horizontal polarization receiving function, and can realize omnidirectional, high-gain and broadband, but its profile is the three-D space structure of every limit size at 1/2nd wavelength to three/two wavelength, can be used as the transmitting antenna of base station, but be not suitable for vehicle mobile equipment at the UHF wave band.Planar shaped polyhedron conductor loops then is the selection of another UHF wave band horizontally polarized omnidirectional antenna, and be two-dimensional structure, but two-dimensional is all about 1/2nd wavelength, can't finely satisfy the needs of onboard system equally at the UHF wave band, and also bring mounting means and kept contradiction between the electrical property as onboard system.Though the flat plane antenna of printed antenna types such as existing microstrip antenna can be realized the horizontal polarization directions figure of omnidirectional and have small-sized, plane characteristic, its low requirement that can't satisfy the mobile digital signal reception that gained.Also having the researcher to propose intersection cross-shaped symmetrical element antenna realizes horizontal polarization moving the antenna scheme document of reception in conjunction with base band DSP (Digital Signal Processing) technology (Lu is expensive auspicious, Zhang Wenjie, Lin Jincai, Xia Zhiping: " research of horizontal polarization mobile receiver aerial and design ", Beijing Broadcasting Institute's journal, 2002 02 phases), but general structure becomes more under the complicated situation, the real space size of antenna itself and planar shaped polyhedron conductor loops are similar and gain is lower.
Nineteen forty-six has horizontal polarization sending and receiving function by sad Ford slit (Alford Slot) antenna that Andrew Alford proposes, and its structure is to open a slit on a round metal tube vertically.But the radiation mechanism of relevant this antenna is not clear, that is that all right is ripe for method for designing.In order to satisfy the needs that Digital Television moves reception, nearest Europe, beautiful antenna researcher has carried out the design and the test of sad Ford slot antenna, also once reported " 5.6dBd gain...flat VSWR and good gain bandwidth performanceover the entire 420-440MHz band ... " (gain 5.6dB, in whole 420-440MHz frequency band, have smooth stationary wave characteristic and good gain bandwidth performance) (" ALFORD SLOTANTENNA ", http://www.eta.chalmers.se/～pgp/alford_slot/alford eng.html).But this result of study is also very immature, and parameters such as gain, directional diagram, standing wave ratio of input voltage are along with frequency sensitive changes.Directional diagram graing lobe and maximum may occur not in the horizontal direction in pitching face, antenna gain may rise and fall greater than 4dB, and minimum standing-wave ratio only is in the 420-440MHz frequency band 2: 1.Relax requirement even approve its horizontal polarization radiation characteristic, also be difficult in the actual onboard system at the UHF wave band greater than the structure of 2 times of wavelength and use other unit for electrical property parameters.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, a kind of horizontal polarization shf band high-gain small-sized plane printing omnidirectional antenna is provided, both satisfied the horizontal polarization Transceiver Features, have omnidirectional's receiving feature and compact geometry again, can be suitable for mobile occasions such as vehicle-mounted, especially the application need of the occasion that installing space such as car is little, and have high gain characteristics.
For realizing such purpose, the present invention adopts the flat plane antenna of printed circuit technique, to meet modern electronic product miniaturization, integrated development trend.Consider that the printed antenna of classical microstrip antenna class can't satisfy mobile subscriber's needs greatly in UHF wave band size, and reduce antenna size when raising the cost, thereby will make the too high reduction of dielectric constant radiation efficiency by the dielectric constant that improves medium substrate.In the technical scheme of the present invention, adopt co-planar waveguide, the line of rabbet joint to combine and constituted radiant section and the partially mixed planar printed antenna structure of feed, antenna and feed structure thereof are formed the coaxial cable excitation that antenna is connected by the central point that intersects at vertical co-planar waveguide by the inclination co-planar waveguide that two co-planar waveguides that intersect vertically, four line of rabbet joint that are connected the co-planar waveguide port, per two line of rabbet joint end points bending constitute four root termination short circuits.In order to improve antenna gain, can be in the outside of the every line of rabbet joint the parallel placement one root parasitism line of rabbet joint.Further, can also respectively connect an electric capacity in the terminal of bending co-planar waveguide.
Antenna base structure of the present invention is: antenna is printed on single face and applies on the copper high frequency laminate, applying copper face middle is two co-planar waveguides that intersect vertically, two co-planar waveguide equal in length, left-right symmetric up and down,, each end points of co-planar waveguide connects two vertical with it line of rabbet joint, another end points of the line of rabbet joint curves inwardly 45 °, and the bending part of per two line of rabbet joint constitutes one section inclination co-planar waveguide altogether.The bending part of four pairs of line of rabbet joint constitutes four sections 45 ° of inclination co-planar waveguides of symmetry.Each slit of an end of inclination co-planar waveguide links to each other with the line of rabbet joint, and the other end is unsettled.The free end center conductor can join with ground plate, also can stay a space between center conductor and ground plate.Antenna feed point is in the co-planar waveguide center conductor intersection of two quadratures, antenna is encouraged by coaxial cable in heart zone hereinto, antenna feed point connects the inner wire of coaxial cable, and four continuous backs of feedback point around the antenna feed point on the co-planar waveguide ground plate join with coaxial cable outer conductor.
In order to improve the gain of antenna, can be in the outside of the every line of rabbet joint the parallel placement one root parasitism line of rabbet joint.
In order further to improve the radiation efficiency of antenna, can disconnect at the inclination co-planar waveguide end points place's center conductor and the ground plate of four 45 ° of bendings, and on each slit between center conductor and the ground plate electric capacity of cross-over connection.
Because antenna of the present invention is plane electric circuit structure completely, can also directly print amplifying circuit at the dielectric-slab another side, and designs through hole at above-mentioned distributing point and directly be connected with amplifier input terminal.
Antenna of the present invention realized horizontal polarization, along the omnidirectional radiation in the base plan.The appropriate design of the parasitic line of rabbet joint, the gain that further improves antenna.By electric capacity of cross-over connection on each slit of 45 ° of inclination co-planar waveguides, further improved resonance frequency, reduced antenna size.Utilize the printing planar structure characteristic and the high-frequency amplifier integrated design of antenna, realize active integrated antenna.
The present invention fully utilizes the theoretical realization of transmission line theory resonant cavity omnidirectional radiation, reduces size, high-gain, and utilize the equivalent magnetic current of the line of rabbet joint to realize horizontal polarization, it can be used in actual reception of Mobile Digital TV, especially in all kinds of vehicle-mounted mobile TV receiving system that is subjected to size, mounting condition restriction, use.In fact after the present invention can be installed in roof, car protecgulum, car, the car side waits for bus and also can be installed in foreground in the car, backstage, chair top etc. everywhere everywhere outward, also promptly can freely select according to hobby and needs.
Description of drawings:
Fig. 1 is a basic model planar printed antenna structural representation of the present invention.
Among Fig. 1,1 is co-planar waveguide, and 2 is the vertical slot line that is connected with each end points of co-planar waveguide, 3 inclination co-planar waveguides for line of rabbet joint bending part formation, and 4 is antenna feed point.
Fig. 2 is for placing the antenna structure view of the parasitic line of rabbet joint.
Among Fig. 2,5 are the parallel parasitic line of rabbet joint in the outside.
Fig. 3 is the antenna structure view of cross-over connection electric capacity on slit between center conductor and the ground plate.
Among Fig. 3,6 are cross-over connection electric capacity.
Embodiment:
Below in conjunction with accompanying drawing and embodiment technical scheme of the present invention is further described.
The basic structure form of embodiments of the invention 1 employing antenna as shown in Figure 1.Antenna is printed on single face and applies on the copper high frequency laminate, applying the copper face dielectric-slab middle is two co-planar waveguides that intersect vertically 1, the equal in length of two co-planar waveguides 1, left-right symmetric up and down,, each end points of co-planar waveguide connects two vertical with it line of rabbet joint 2, another end points of the line of rabbet joint 2 curves inwardly 45 °, and the bending part of per two line of rabbet joint constitutes one section inclination co-planar waveguide 3 altogether.The bending part of four pairs of line of rabbet joint constitutes four sections 45 ° of inclination co-planar waveguides 3 of symmetry, and each slit of an end of inclination co-planar waveguide 3 links to each other with the line of rabbet joint 2, and the other end is unsettled.Inclination co-planar waveguide 3 free end center conductors can join with ground plate, also can stay a space between center conductor and ground plate.Antenna feed point 4 is in the central area, promptly be in the intersection of the co-planar waveguide 1 of two quadratures, antenna is encouraged by coaxial cable in heart zone hereinto, antenna feed point 4 connects the inner wire of coaxial cable, and four continuous backs of feedback point around the antenna feed point 4 on the co-planar waveguide ground plate join with coaxial cable outer conductor.
In order to improve the gain of antenna, can be in the outside of the every line of rabbet joint 2 the parallel placement one root parasitism line of rabbet joint 5, form the structure of the embodiment of the invention 2, as shown in Figure 2.
In order further to improve the radiation efficiency of antenna, can disconnect at the end points place center conductor and the ground plate of the inclination co-planar waveguide 3 of four 45 ° of bendings, and on each slit between center conductor and the ground plate electric capacity 6 of cross-over connection, embodiment 3 as shown in Figure 3.
Because antenna of the present invention is plane electric circuit structure completely, can also directly print amplifying circuit at the dielectric-slab another side, and directly be connected formation embodiments of the invention 4 with amplifier input terminal at above-mentioned antenna feed point 4 design through holes.
The key point of Antenna Design of the present invention has:
1, the equal in length of the two vertical co-planar waveguides 1 in center, and up and down, left-right symmetric, can guarantee excitation electrical field constant amplitude, homophase on the line of rabbet joint; By the center conductor width and the gap width of appropriate design co-planar waveguide 1, can realize the input impedance that encourages coaxial cable required, guarantee the coupling of point of excitation.
2, the line of rabbet joint 2 is vertical with center co-planar waveguide 1, and links to each other with center co-planar waveguide 1 slit.The width of the line of rabbet joint 2 and the design of length should be considered radiation efficiency, take into account the convenience of impedance matching again.
3,45 ° of inclination co-planar waveguides 3 are in order to improve the uniformity that equivalent magnetic current distributes on the line of rabbet joint, to improve antenna radiation efficiency.Each slit of an end of inclination co-planar waveguide 3 links to each other with the line of rabbet joint 2, and the other end is unsettled.The width of length, slit and the center conductor of choose reasonable inclination co-planar waveguide 3 improves the uniformity that the equivalent magnetic current on the line of rabbet joint distributes, and takes into account impedance matching.Can join with ground plate at the free end center conductor, also can between center conductor and ground plate, stay a space.Then increased a parameters optimization in the design of inclination co-planar waveguide 3: gap length has increased design freedom.
4, the distributing point 4 of inner conductor and co-planar waveguide 1 center conductor intersection joins, and joins with coaxial cable outer conductor after four feedback points on the co-planar waveguide ground plate link to each other.Directly print high-frequency amplifier in substrate reverse side central area, can realize and the integrated design of amplifier, in the case, distributing point 4 is connected to reverse side with through-hole form and is connected with amplifier input terminal.
5, the parallel placement one root parasitism line of rabbet joint 5 in the outside of the every line of rabbet joint 2 can improve the uniformity that equivalent magnetic current distributes on the line of rabbet joint 2, and then improves the radiation efficiency of antenna.The length of the parasitic line of rabbet joint 5 should be less than the original line of rabbet joint 2.The length of the parasitic line of rabbet joint 5 of choose reasonable, width and with the spacing of the original line of rabbet joint 2, it is very important not only the equivalent magnetic current that improves the original line of rabbet joint 2 to be distributed, the radiation of the parasitic line of rabbet joint 5 itself also will further improve antenna gain.
6,45 ° of inclination co-planar waveguide 3 one ends link to each other with the line of rabbet joint 2, and the other end is unsettled.Leave a space between free end center conductor and the ground plate; Electric capacity 6 of cross-over connection on 45 ° of each slits of inclination co-planar waveguide 3 free ends; The choose reasonable capacitance can increase the uniformity that equivalent magnetic current distributes on the line of rabbet joint 2, the gain that further improves antenna.Can also improve simultaneously the resonance frequency of antenna, also promptly under the situation that frequency is determined, reduce the size of antenna.
Basic thought of the present invention comes from transmission line theory resonant cavity theory, purpose is to fully utilize the theoretical realization of transmission line theory resonant cavity omnidirectional radiation, reduces size, high-gain, and utilize the equivalent magnetic current of the line of rabbet joint to realize horizontal polarization, it can be used in actual reception of Mobile Digital TV, especially in all kinds of vehicle-mounted mobile TV receiving system that is subjected to size, mounting condition restriction, use.
Classical microstrip antenna is two-sided copper clad plate structure, and radiation field is a horizontal polarization but the greatest irradiation direction is the normal direction of substrate, can't realize the omnidirectional radiation in the base plan, and it is former because existence of ground plate forms mirror image.According to the resonant cavity model of microstrip antenna, rectangular patch can be regarded a resonant cavity as and design.The present invention adopts the single face copper clad plate, and ground plate is placed on the outside of rectangular patch, and reserves a belt line of rabbet joint between ground plate and rectangular patch, constitutes a plane resonantor.According to the radiation mechanism of microstrip antenna, the radiation of this plane resonantor can be regarded as by belt line of rabbet joint generation.In order to realize omnidirectional radiation, these the belt line of rabbet joint four limit equivalent magnetic currents distribute must constant amplitude, homophase, and four summits of the line of rabbet joint of for this reason will going in ring disconnect, and form four vertical slot line 2.1 excitation of co-planar waveguide of each root vertical slot line 2 usefulness.In order to improve the resonance frequency of plane resonantor, promptly reduce antenna size, 2 end points places bend inwards 45 ° in vertical slot line, constitute 45 ° of inclination co-planar waveguides 3 more in twos.The other end of inclination co-planar waveguide 3 can be that center conductor links to each other with ground plate, also can stay a space between center conductor and ground plate.So far just formed one four limit cophase detector, had the equivalent magnetic current ring that same magnitude distributes, can realize horizontal polarization, along the omnidirectional antenna in the base plan.
By above basic principle and the course of work as can be seen, the radiation efficiency of horizontal polarization planographic omnidirectional antenna of the present invention depends primarily on the uniformity that equivalent magnetic current distributes on the vertical slot line 2, be that equivalent magnetic current distributes evenly more on each root line of rabbet joint 2, radiation efficiency is high more.For this reason, can be in each root vertical slot line 2 outside the parallel placement one root parasitism line of rabbet joint 5, the length by the parasitic line of rabbet joint 5 of appropriate design, width, with the spacing of vertical slot line 2, can realize improving the inhomogeneity purpose that equivalent magnetic current distributes on the vertical slot line 2.Simultaneously, the appropriate design of the above-mentioned parameter of the parasitic line of rabbet joint 5 can also realize the radiation of the parasitic line of rabbet joint 5 generations and the additivity superposition of vertical slot line 2 radiation, the gain that further improves antenna of the present invention.Another measure that improve resonance frequency, promptly reduces antenna size is an electric capacity 6 of cross-over connection (Fig. 3) on each slit of free end of 45 ° of inclination co-planar waveguides 3, this moment 45 ° of inclination co-planar waveguides 3 the free end center conductor must and ground plate between stay a space.Another benefit of cross-over connection electric capacity 6 is to impel that equivalent magnetic current is more evenly distributed on the vertical slot line 2, further improves radiation efficiency and antenna gain.
In view of the printing planar structure of antenna of the present invention, can directly print high-frequency amplifier in substrate another side central area, carry out integrated design, realize active integrated antenna.This moment, the distributing point 4 with above-mentioned passive antenna was connected with amplifier input terminal, and this connection can realize at distributing point 4 through holes.
Embodiment 1:
Processed one pair of basic model planar printed antenna by structure shown in Figure 1 is actual, and experiment measuring main unit for electrical property parameters S that should the example antenna
11, voltage standing wave ratio, gain and antenna pattern.This example Antenna Design is tuned in 722MHz.Standing-wave ratio is 706～742MHz less than 1.5 frequency range, in 723.5MHz standing-wave ratio minimum, is 1.16.Measured gain is greater than 3dB.The inhomogeneities of E face (θ=90 °) directional diagram occurs in feeder line and draws port and 45 ° of inclination co-planar waveguide places less than 4.5dB.
Embodiment 2:
Processed one pair of planar printed antenna by structure shown in Figure 2 is actual with the parasitic line of rabbet joint, and experiment measuring main unit for electrical property parameters S that should the example antenna
11, voltage standing wave ratio, gain and antenna pattern.This example Antenna Design is tuned in 722MHz.Standing-wave ratio is 699～738MHz less than 1.5 frequency range, in 719.5MHz standing-wave ratio minimum, is 1.20.Measured gain is greater than 4.5dB.The inhomogeneities of E face (θ=90 °) directional diagram occurs in feeder line and draws port and 45 ° of inclination co-planar waveguide places less than 5.0dB.
Embodiment 3:
By the actual planar printed antenna of having processed cross-over connection electric capacity on the one pair 45 ° inclination co-planar waveguide slits of structure shown in Figure 3, and experiment measuring main unit for electrical property parameters S that should the example antenna
11, voltage standing wave ratio, gain and antenna pattern.This example Antenna Design is tuned in 722MHz.Standing-wave ratio is 708～758MHz less than 1.5 frequency range, in 725.3MHz standing-wave ratio minimum, is 1.12.Measured gain is greater than 6.0dB.The inhomogeneities of E face (θ=90 °) directional diagram occurs in feeder line and draws port and 45 ° of inclination co-planar waveguide places less than 8.0dB.
Embodiment 4:
Reality has been processed one pair of active integrated planar printed antenna of integrated design, and amplifier directly is printed on substrate reverse side center.Adopt the HMC315 amplification module, this module nominal gain is 12.5dB in this frequency range, but adopt our amplifier made of this module itself to gain measured value only between 8.0～10.0dB, and input standing-wave ratio measured value is about 2.0, output standing-wave ratio measured value is about 3.0.Adopt the passive antenna of embodiment three to carry out integrated design and processed one pair of active integrated antenna, and experiment measuring main unit for electrical property parameters S that should the example antenna
11, voltage standing wave ratio, gain and antenna pattern.This example Antenna Design is tuned in 722MHz.Standing-wave ratio is 670～820MHz less than 3.1 frequency range, and in this frequency range substantially flat.Measured gain is greater than 10.0dB.The inhomogeneities of E face (θ=90 °) directional diagram occurs in feeder line and draws port and 45 ° of inclination co-planar waveguide places less than 10.0dB.This example antenna performance is not very stable, mainly is that amplifier section also has very big room for improvement.But the experiment by this example antenna has shown that it is feasible that antenna of the present invention carries out integrated design.
The present invention has realized the gain greater than common dipole antenna, and physical dimension only is about quarter-wave.Basic structure embodiment 1 every edge lengths is slightly less than quarter-wave, the every edge lengths of embodiment 2 (being with the parasitic line of rabbet joint) is also only near quarter-wave, and embodiment 3 (cross-over connection electric capacity on 45 ° of inclination co-planar waveguides) is identical with embodiment 2 with the physical dimension of embodiment 4 (the active integrated planar printed antenna of integrated design).
The present invention has realized the horizontal polarization reception, has planar structure.Substrate body thickness has been considered the facility on the engineerings such as feed connection, installation less than 2mm, and antenna gross thickness of the present invention can be controlled between 1.0～2.0cm.
The present invention has realized that greatest irradiation direction omnidirectional of (being horizontal plane) in base plan receives.Among the embodiment 1 and 2, the inhomogeneities in the horizontal plane is less than 5dB.Omni-directional is poor slightly among the embodiment 3 and 4, is about 8.0dB and 10.0dB respectively.
Claims (4)
1, a kind of horizontal polarization shf band high-gain small-sized plane printing omnidirectional antenna, it is characterized in that being printed on single face applies on the copper high frequency laminate, applying the copper face dielectric-slab middle is two co-planar waveguides that intersect vertically (1), the equal in length of two co-planar waveguides (1), up and down, left-right symmetric, each end points of co-planar waveguide connects two vertical with it line of rabbet joint (2), another end points of the line of rabbet joint (2) curves inwardly 45 °, the bending part of per two line of rabbet joint constitutes one section inclination co-planar waveguide (3) altogether, the bending part of four pairs of line of rabbet joint constitutes symmetry four sections 45 ° inclination co-planar waveguides (3), antenna feed point (4) is in the intersection of the co-planar waveguide (1) of two quadratures, the inner wire that connects coaxial cable, antenna feed point (4) join with coaxial cable outer conductor the back that links to each other of four feedback points on the co-planar waveguide ground plate all around.
2, horizontal polarization shf band high-gain small-sized plane printing omnidirectional antenna as claimed in claim 1 is characterized in that the parallel placement one root parasitism line of rabbet joint (5) in the outside of the every line of rabbet joint (2).
3, horizontal polarization shf band high-gain small-sized plane printing omnidirectional antenna as claimed in claim 1 is characterized in that at the end points place of inclination co-planar waveguide (3) electric capacity of cross-over connection (6) on each slit between center conductor and the ground plate.
4, horizontal polarization shf band high-gain small-sized plane printing omnidirectional antenna as claimed in claim 1, it is characterized in that directly printing amplifying circuit, and directly be connected with amplifier input terminal at antenna feed point (4) design through hole at described deposited copper face dielectric-slab another side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03141791 CN1233068C (en) | 2003-07-24 | 2003-07-24 | Horizontal polarization hyperfrequency band high-gain minitype flat printing isotropic antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 03141791 CN1233068C (en) | 2003-07-24 | 2003-07-24 | Horizontal polarization hyperfrequency band high-gain minitype flat printing isotropic antenna |
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| CN1482704A CN1482704A (en) | 2004-03-17 |
| CN1233068C true CN1233068C (en) | 2005-12-21 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100725408B1 (en) * | 2005-11-03 | 2007-06-07 | 삼성전자주식회사 | System for polarization diversity antenna |
| CN101895011B (en) * | 2010-06-13 | 2013-04-10 | 南京邮电大学 | Wideband printing antenna with symmetrical dipole-antipodal slot line composite structure |
| CN101895009B (en) * | 2010-06-13 | 2013-06-05 | 南京邮电大学 | Double-frequency broad-band antenna with symmetrical dipole-tapered slot line combined structure |
| KR20130053490A (en) * | 2011-11-14 | 2013-05-24 | 현대모비스 주식회사 | Patch antenna which is has radiation of ellipse shape |
| US9679828B2 (en) | 2012-01-31 | 2017-06-13 | Amit Verma | System-on-chip electronic device with aperture fed nanofilm antenna |
| KR101944340B1 (en) | 2012-12-28 | 2019-01-31 | 엘지디스플레이 주식회사 | Slot antenna and information terminal apparatus using the same |
| CN103647140B (en) * | 2013-12-16 | 2016-05-18 | 广州杰赛科技股份有限公司 | Dual polarized antenna |
| CN103915685B (en) * | 2014-04-04 | 2016-01-13 | 清华大学 | A kind of four unit mimo antenna of the small size wide bandwidth based on printed circuit board (PCB) |
| CN105161811B (en) * | 2015-08-24 | 2018-03-09 | 江苏贝孚德通讯科技股份有限公司 | A kind of Waveguide polarization is multiplexed front end assemblies |
| CN105281031B (en) * | 2015-11-16 | 2018-02-27 | 广东博纬通信科技有限公司 | A kind of ultra-wideband dual polarization low-frequency vibrator unit and its multi-band array antenna |
| WO2020107259A1 (en) * | 2018-11-28 | 2020-06-04 | 华为技术有限公司 | Dual-polarized micro-strip patch antenna, package antenna, and terminal device |
| WO2023098986A1 (en) * | 2021-12-01 | 2023-06-08 | Nokia Technologies Oy | Antenna apparatus |
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