CN110401026B - Magnetoelectric dipole filtering antenna with approximate elliptical filtering response - Google Patents
Magnetoelectric dipole filtering antenna with approximate elliptical filtering response Download PDFInfo
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- CN110401026B CN110401026B CN201910498079.8A CN201910498079A CN110401026B CN 110401026 B CN110401026 B CN 110401026B CN 201910498079 A CN201910498079 A CN 201910498079A CN 110401026 B CN110401026 B CN 110401026B
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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
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0053—Selective devices used as spatial filter or angular sidelobe filter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
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Abstract
The invention belongs to the technical field of wireless communication, and discloses a magnetoelectric dipole filter antenna with approximate elliptic filter response.A feed structure comprises a coupling groove printed on the upper layer of a double-sided copper-clad dielectric plate, a forked microstrip power divider printed on the lower layer of the double-sided copper-clad dielectric plate with the thickness of 1mm and a U-shaped short-circuit branch section; the radiation structure comprises a radiation patch, a coupling branch and a vertical short-circuit wall; the radiation patch and the coupling branch are respectively printed on the upper layer and the lower layer of a double-sided copper-clad dielectric slab with the thickness of 1.5 mm; the vertical short-circuit wall is printed on two single-sided copper-clad dielectric slabs with the thickness of 0.5 mm. The invention realizes the magnetoelectric dipole filter antenna with approximate elliptical filter response and realizes good filter frequency response. The magnetoelectric dipole filter antenna with the approximate elliptical filter response greatly widens the application of the magnetoelectric dipole antenna in the field of filter antennas.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a magnetoelectric dipole filtering antenna with an approximate elliptical filtering response.
Background
Currently, the closest prior art: the methods for implementing the filtering antenna in the industry mainly include the following methods: first, a filtering antenna is implemented by replacing the last-order resonator of a band-pass filter with an antenna radiator. Based on the filter synthesis principle, the band-pass filter needs to be designed in advance. Although this approach can achieve good filter response, the insertion loss introduced by the multi-order resonators in the bandpass filter reduces the radiation gain of the antenna. To solve this problem, a design method of a filter antenna without using an additional filter circuit is proposed. It comprises two aspects, on one hand, introducing a resonant structure in the antenna feed network and, on the other hand, introducing a resonant structure on the antenna radiator. At the resonant frequency, most of the energy is trapped by the resonant structure and cannot be radiated effectively, thereby creating a radiation zero. However, due to the introduction of the resonant structure, the former may increase the complexity of the feed network, occupy additional space, increase the size of the antenna, and the latter may deteriorate the radiation pattern of the antenna. In addition to using resonant structures, cross-coupled filtering theory is also often used to design filtering antennas. The basic principle is that two cross-coupling paths are created on the basis of one direct coupling path, and at a required frequency point, signals on the direct coupling path and signals on the indirect coupling path are equal in amplitude and opposite in phase, so that cancellation is realized, and further a radiation zero point is generated. In addition to the above methods, radiation cancellation methods are also used to guide the filtered antenna design. The antenna radiator is provided with the slot, and the parasitic patch and the short-circuit column are introduced, so that the current on the radiator is split into a plurality of parts in different directions, radiation cancellation is realized, a radiation zero point is generated, and the purpose of filtering is achieved.
In summary, the problems of the prior art are as follows:
(1) in the existing filtering antenna designed based on the comprehensive principle of a filter, a multi-order resonator in the filter introduces larger insertion loss, so that the gain of the antenna is reduced; by introducing a resonant structure in the antenna radiator or feed network, the complexity of the feed network is increased, affecting the radiation pattern of the antenna.
(2) The cross-coupling design method is only suitable for a specific antenna form due to the need of creating a cross-coupling path, and the application range is limited.
(3) With a filtered antenna designed based on the radiation cancellation principle, the radiation pattern may deteriorate.
(4) The bandwidth of the existing filtering antenna is not wide enough to meet the requirement of modern wireless communication on the broadband.
The difficulty of solving the technical problems is as follows: the problems of large insertion loss and antenna gain reduction are solved, and the key point is that a multi-order filter is not introduced on the premise of realizing filter response; the problem of narrow bandwidth is solved, and the key point is to select an antenna form with wide bandwidth to realize a filtering antenna.
The significance of solving the technical problems is as follows: by utilizing the broadband characteristic of a magnetoelectric dipole and the inherent radiation zero point at the low-frequency edge of a pass band and introducing a coupling branch and a U-shaped short-circuit branch, the radiation zero point is realized at the edges of the low-frequency and high-frequency pass bands, and good filter frequency band response is obtained. The antenna achieves high radiation gain and high out-of-band rejection ratio due to the fact that no additional filtering circuit is used.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a magnetoelectric dipole filtering antenna with an approximate elliptical filtering response.
The invention is realized in such a way that a magnetoelectric dipole filter antenna with an approximately elliptical filter response comprises: a feed structure and a radiating structure;
the feed structure comprises a coupling groove printed on the upper layer of the double-sided copper-clad dielectric plate, a Y-shaped micro-strip power divider printed on the lower layer of the double-sided copper-clad dielectric plate with the thickness of 1mm and a U-shaped short-circuit branch section;
the radiation structure comprises a radiation patch, a coupling branch and a vertical short-circuit wall; the radiation patch and the coupling branch are respectively printed on the upper layer and the lower layer of a double-sided copper-clad dielectric slab with the thickness of 1.5 mm; the vertical short-circuit wall is printed on two single-sided copper-clad dielectric slabs with the thickness of 0.5 mm.
The magnetoelectric dipole filter antenna with approximate elliptical filter response comprises a radiation structure and a feed structure, and the main structural parameter of the magnetoelectric dipole filter antenna is Ls,Ws,Le,We,Ld,WdD, wherein LsLength of coupling groove, WsIs the width of the coupling groove, LeLength of radiating patch, WeIs the width of the radiation patch, LdTo couple the lengths of the branches, WdD is the distance between the vertical short-circuit walls for the width of the coupling branch.
Further, the feed structure is realized by microstrip line-slot coupling; the tail end of the power divider of the Y-shaped microstrip line is provided with a round branch.
Furthermore, the upper end of the vertical short-circuit wall is connected with a coupling branch knot for exciting the radiation patch, and the lower end of the vertical short-circuit wall is connected with the ground plane to form a short-circuit condition.
Furthermore, the radiation structure is a magnetoelectric dipole composed of a radiation patch, a coupling branch and a vertical short circuit wall.
Furthermore, the tail ends of two branches of the fork-shaped microstrip power divider are round branches for impedance matching; the slot line is used for transferring the energy of the fork-shaped microstrip power divider to the vertical short circuit wall; the U-shaped short circuit branch is used for inhibiting low-frequency out-of-band radiation.
Another object of the present invention is to provide a wireless communication system using the magnetoelectric dipole filter antenna with an approximate elliptical filter response.
In summary, the advantages and positive effects of the invention are: the invention realizes a radiation zero point at the high-frequency edge of the passband and the low-frequency stop band respectively by utilizing the inherent radiation zero point of the magnetoelectric dipole antenna at the low-frequency edge of the passband and then introducing the coupling branch and the U-shaped short-circuit branch, thereby realizing the magnetoelectric dipole filter antenna with approximate elliptical filter response. The end-fire antenna can achieve stable gain and a symmetrical directional diagram within a relative bandwidth of 53.5 percent, and achieve good filtering frequency response. The magnetoelectric dipole filter antenna with the approximate elliptical filter response greatly widens the application of the magnetoelectric dipole antenna in the field of filter antennas.
The invention utilizes the inherent radiation zero point of the magnetoelectric dipole antenna at the low-frequency edge of the passband, introduces the coupling branch, feeds power to the radiation patch in a capacitive coupling mode, introduces the radiation zero point at the high-frequency edge of the passband, and realizes good filtering response. In order to further improve the out-of-band radiation suppression level, the invention introduces two U-shaped short-circuit branches, successfully introduces a radiation zero point in the low-frequency stop band, and improves the out-of-band radiation suppression level by 5 dB. In addition, due to the introduction of the coupling branches, the antenna introduces a resonance point at high frequency, and a relative impedance bandwidth of 53.5% is realized. Meanwhile, the antenna obtains stable gain and a symmetrical directional diagram in the whole working frequency band.
Compared with the prior art, the invention has the following advantages:
1. the invention utilizes the inherent radiation zero point generated by the magnetoelectric dipole antenna at the low-frequency edge of the passband to reduce the complexity of the design of the filter antenna, introduces the coupling branch under the radiation patch, realizes a radiation zero point at the high-frequency edge of the passband on the premise of not increasing the section and introducing the filter, and realizes good filter response.
2. The invention realizes the filter antenna by using the magnetoelectric dipole, realizes 53.5 percent of relative bandwidth by using the impedance complementary characteristic of the electric dipole and the magnetic dipole, and greatly improves the bandwidth of the filter antenna. And the antenna obtains a stable gain and a symmetrical directional pattern in the whole working frequency band.
3. Compared with the traditional magnetoelectric dipole antenna, the filter antenna realizes the characteristic of low profile while realizing the filter frequency response by utilizing the slot coupling excitation and the capacitive coupling feed mode.
4. The invention has simple structure, convenient processing, low cost and light weight. Compared with the traditional inverted L-shaped feed, the slot coupling mode used by the invention has stronger stability.
Drawings
Fig. 1 is a schematic structural diagram of a magnetoelectric dipole filter antenna with an approximately elliptical filter response according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a vertical short-circuit wall and a radiation patch provided by an embodiment of the invention;
fig. 3 is a schematic structural diagram of a fork-shaped microstrip power divider and a ground plane according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a feed structure of a magnetoelectric dipole filtering antenna with an approximate elliptical filtering response according to an embodiment of the present invention;
in the figure: 1. a forked microstrip power divider; 2. a ground plane; 3. a coupling groove; 4. a shorting post; 5. a vertical short-circuit wall; 6. a radiation patch; 7. coupling the branch sections; 8. u-shaped short-circuit branch knots.
Fig. 5 is a diagram illustrating the results of gain and standing wave ratio of the filtering antenna provided by the embodiment of the present invention.
Fig. 6 is a diagram illustrating the efficiency results of the filtering antenna according to the embodiment of the present invention.
Fig. 7 is a diagram illustrating the results of filtering antenna radiation patterns provided by embodiments of the present invention.
In the figure, a: 3 GHz; b is 4 GHz; c, 5GHz.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The broadband filter antenna aims at the technical problem that the bandwidth of the existing filter antenna is not wide enough and cannot meet the requirement of modern wireless communication on the broadband. The invention realizes a radiation zero point at the high-frequency edge of the passband and the low-frequency stop band respectively by utilizing the inherent radiation zero point of the magnetoelectric dipole antenna at the low-frequency edge of the passband and then introducing the coupling branch and the U-shaped short-circuit branch, thereby realizing the magnetoelectric dipole filter antenna with approximate elliptical filter response.
The technical solution of the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 4, a magnetic-electric dipole filter antenna with an approximately elliptical filter response provided by an embodiment of the present invention includes: the power divider comprises a fork-shaped microstrip power divider 1, a ground plane 2, a coupling slot 3, a short circuit column 4, a vertical short circuit wall 5, a radiation patch 6, a coupling branch 7 and a U-shaped short circuit branch 8.
The feed structure of the magnetoelectric dipole filter antenna with the approximate elliptical filter response provided by the embodiment of the invention comprises: the power divider comprises a forked microstrip power divider 1, a ground plane 2, a coupling slot 3, a short circuit column 4 and a U-shaped short circuit branch section 8; the tail ends of two branches of the fork-shaped microstrip power divider 1 are round branches, so that the effect of impedance matching is achieved. The slot line is used for transferring the energy of the fork-shaped microstrip power divider 1 to the vertical short-circuit wall 5. The U-shaped short-circuit stub 8 is used to suppress low-frequency out-of-band radiation.
The radiation structure of the magnetoelectric dipole filter antenna with the approximate elliptical filter response provided by the embodiment of the invention comprises a vertical short-circuit wall 5, a radiation patch 6 and a coupling branch 7; and the radiation patch 6 and the coupling branch 7 are respectively printed on the upper layer and the lower layer of the double-sided copper-clad dielectric plate with the thickness of 1.5 mm. The vertical short-circuit wall 5 is printed on two single-sided copper-clad dielectric plates with the thickness of 0.5 mm.
The technical effects of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 5, the results of simulation and actual measurement of standing wave ratio and gain of the filtering antenna according to the present invention are shown. The results show that the antenna achieves a relative impedance bandwidth of 53.5% (standing wave ratio < 1.5). Three radiation zeros are realized on a gain curve, and a zero 1 and a zero 2 are respectively arranged at the edges of a pass band, so that the selectivity of the pass band of the antenna is improved. The zero point 3 is in a low-frequency impedance band, and the out-of-band radiation of the antenna is effectively restrained. In the whole working frequency band, the antenna realizes the average radiation gain of 8dBi and the out-of-band radiation rejection ratio exceeding 17.9dB, and obtains good filtering frequency response.
As shown in fig. 6, the results of simulation and actual measurement of the efficiency of the filtering antenna according to the present invention are shown. The result shows that the antenna can realize the simulation efficiency of 95 percent on average in the passband, the actual measurement efficiency is 90 percent, and the antenna can effectively radiate energy. The efficiency of the antenna in the stop band is 10%, and the out-of-band radiation can be effectively inhibited. The actual measurement efficiency is lower than that of simulation, and may be caused by an antenna measurement system and a wiring error.
As shown in fig. 7, the simulated and measured radiation pattern results of the filtering antenna according to the present invention. The results show that the antenna achieves stable radiation patterns, nearly symmetrical E-plane and H-plane patterns, with the E-plane having respective beam widths of 65 °, 72 ° and 71 °, and the H-plane having respective beam widths of 54 °, 87 ° and 77 ° at the 3G, 4G and 5G frequency points. The antenna achieves cross polarization below-25 dB and a front-to-back ratio above 18dB, low cross polarization and low back radiation levels throughout the operating band.
The invention utilizes the inherent radiation zero point of the magnetoelectric dipole antenna at the low-frequency edge of the passband, introduces the coupling branch, feeds power to the radiation patch in a capacitive coupling mode, introduces the radiation zero point at the high-frequency edge of the passband, and realizes good filtering response. In order to further improve the out-of-band radiation suppression level, two U-shaped short-circuit branches are introduced, a radiation zero point is successfully introduced into the low-frequency stop band, and the out-of-band radiation suppression level is improved by 5 dB. In addition, due to the introduction of the coupling branches, the antenna introduces a resonance point at high frequency, and a relative impedance bandwidth of 53.5% is realized. Meanwhile, the antenna obtains stable gain and a symmetrical directional diagram in the whole working frequency band.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. A magnetoelectric dipole filter antenna having an approximately elliptical filter response, the magnetoelectric dipole filter antenna having an approximately elliptical filter response comprising: a feed structure and a radiating structure;
the feed structure comprises a coupling groove etched on an upper layer metal plate of the first double-sided copper-clad dielectric plate, a forked microstrip power divider printed on a lower layer of the first double-sided copper-clad dielectric plate, and two U-shaped short-circuit branches;
the radiation structure comprises two radiation patches, four coupling branches and two vertical short-circuit walls;
the two radiation patches and the four coupling branches are respectively printed on the upper layer and the lower layer of the second double-sided copper-clad dielectric slab, the two radiation patches are arranged on the upper layer of the second double-sided copper-clad dielectric slab, the four coupling branches are arranged on the lower layer of the second double-sided copper-clad dielectric slab, and the coupling branches transmit electromagnetic energy to the radiation patches through coupling;
the two vertical short-circuit walls are respectively printed on the two single-sided copper-clad dielectric plates, and the upper end of each vertical short-circuit wall is respectively and directly connected with the two coupling branches for exciting the radiation patches;
the lower ends of the two vertical short-circuit walls are directly connected with the upper layer metal plate of the first double-sided copper-clad dielectric plate to form a short-circuit condition;
the tail ends of two branches of the forked micro-strip power divider in the feed structure are round branches for impedance matching;
the coupling slot in the feed structure is a slot etched on the upper layer metal plate of the first double-sided copper-coated dielectric plate and used for transferring the energy of the fork-shaped microstrip power divider to the radiation structure of the antenna to realize the feed of the antenna;
two U-shaped short-circuit branches in the feed structure are respectively positioned on two sides of two fork-shaped arms of the fork-shaped microstrip power divider and used for inhibiting low-frequency out-of-band radiation.
2. A wireless communication system employing the magnetoelectric dipole filter antenna having an approximately elliptical filter response of claim 1.
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| CN109860996B (en) | 2019-03-01 | 2023-12-05 | 华南理工大学 | Low-profile dual-polarization filtering magneto-electric dipole antenna |
| CN110838615B (en) * | 2019-11-29 | 2021-04-20 | 大连理工大学 | Double-frequency line-circular polarization directional antenna |
| CN111628282B (en) * | 2020-06-02 | 2021-06-15 | 北京邮电大学 | Vertical feed's dual-frenquency filtering patch antenna |
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| CN111883915B (en) * | 2020-07-13 | 2022-10-21 | 南京理工大学 | Broadband magnetoelectric dipole filtering antenna |
| CN112186341B (en) * | 2020-09-29 | 2021-12-28 | 华南理工大学 | Base station antenna, low-frequency radiation unit and radiation arm |
| CN112421219B (en) * | 2020-10-26 | 2022-11-29 | 京信通信技术(广州)有限公司 | Scattering suppression structure, electromagnetic boundary, low-frequency radiation unit and antenna |
| CN113097713A (en) * | 2021-04-16 | 2021-07-09 | 中山大学 | Broadband high-gain microstrip magnetic dipole antenna |
| CN113497356B (en) * | 2021-07-13 | 2022-10-25 | 西安电子科技大学 | Dual-band dual-polarization filtering antenna |
| CN113497357B (en) * | 2021-07-13 | 2022-08-02 | 西安电子科技大学 | Broadband dual-polarization filtering antenna |
| CN113471689A (en) * | 2021-07-26 | 2021-10-01 | 东莞理工学院 | Magnetoelectric dipole antenna with filtering characteristic |
| CN114976654B (en) * | 2022-06-13 | 2023-10-31 | 南京邮电大学 | Conductor screen rear antenna |
| CN117578068B (en) * | 2024-01-15 | 2024-05-07 | 广东工业大学 | Magneto-electric dipole filter antenna with high frequency selectivity |
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