CN215184541U - Structure for inhibiting coupling of broadband dual-frequency dual-polarized base station antenna - Google Patents
Structure for inhibiting coupling of broadband dual-frequency dual-polarized base station antenna Download PDFInfo
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- CN215184541U CN215184541U CN202120173464.8U CN202120173464U CN215184541U CN 215184541 U CN215184541 U CN 215184541U CN 202120173464 U CN202120173464 U CN 202120173464U CN 215184541 U CN215184541 U CN 215184541U
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Abstract
The utility model discloses a restrain structure of broadband dual-frenquency dual-polarization base station antenna coupling, include, dual-polarization plane dipole low frequency band antenna, novel frequency selective surface and baffle structure based on choke, the low frequency channel is 0.69-0.96 GHz. The utility model discloses introduce choke coil between high band antenna and low band antenna, novel frequency selective surface and baffle structure, utilize choke coil to present opening a way at the high band, present the characteristic of short circuit at the low band, and utilize the frequency selective surface to the low frequency transmission, to the characteristic of high frequency reflection, mutual coupling between the different frequency band antennas has effectively been suppressed, and utilize the baffle to improve the wave width problem of widening that the high frequency antenna array brought, high gain and stable radiation pattern have all been obtained at two frequency channels finally, on solving the problem of 4G/5G basic station antenna array cross-band coupling, good application prospect has.
Description
Technical Field
The utility model relates to a microwave device's technical field especially relates to a structure of restraines broadband dual-frenquency double polarization base station antenna coupling.
Background
With the development of communication technology, 2G, 3G, 4G and 5G systems are beginning to be used compatibly, and it will be the case that the base stations of the above systems are used together for a long time in the future, so the contradiction between the huge number of base station antennas and the increasingly tense site resources is aggravated. The most common structure is to use a multi-band multi-array common-aperture base station antenna, that is, by means of compact array layout, the antenna arrays of 2G, 3G, 4G and 5G frequency bands are integrated, share one reflecting plate and one antenna housing, and are arranged in a staggered manner. The structure realizes signal coverage and communication of a plurality of network systems, and can fully utilize original base station site resources. However, the problem is that the antenna array of multiple frequency bands is placed in a limited space, causing severe electromagnetic interference.
The size of the low-frequency antenna is usually larger than that of the high-frequency unit, and at this time, the unit working at the low-frequency band is represented as a large scatterer, so that the shielding problem of the high-frequency antenna unit is serious. When the antenna operates in a low frequency band, the low frequency band antenna resonates in a high-order mode of a high frequency band frequency, resulting in a damaged radiation performance of the high frequency band antenna, a distorted radiation pattern, a deteriorated isolation between antenna arrays, and a reduced port isolation and input impedance matching. The common aperture design and mutual coupling affects the radiation performance of the high-band antenna in many ways, severely affecting signal coverage and communication quality.
Meanwhile, with the application of a large-scale MIMO antenna array, the distance between array units is reduced, so that stronger co-frequency coupling interference is caused, and the problems of mismatching, directional diagram distortion, inter-unit isolation deterioration of the antenna array, reduction of beam scanning capability of the array and the like are caused.
The modern cellular base station antenna is usually a broadband multiband antenna, so that the problem of cross-frequency-band scattering between different-frequency broadband antenna arrays and the problem of broadband same-frequency coupling caused by small distance between same-frequency antenna units are solved, and the shape preservation of a directional diagram of each frequency-band antenna is realized.
This technique inserts a choke coil on the low-frequency radiating element by loading the choke coil on the low-frequency element, wherein the choke coil exhibits an open-circuit characteristic for high frequencies and a short-circuit characteristic for low frequencies. This minimizes unwanted high frequency currents on the low frequency radiating elements and restores the radiation pattern of the array in the high frequency band. In the current problem of suppressing cross-band scattering, related researches on design of a choke-based broadband dual-polarized planar dipole antenna are less at present.
By using a novel frequency selective surface, the frequency selective surface has a passband characteristic for a low frequency band and an ideal reflection characteristic for a high frequency band, and provides a promising structure for realizing a low-profile high-gain dual-frequency antenna design.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to overcome exist not enough among the prior art, the utility model provides a restrain broadband dual-frenquency double polarization base station antenna coupling's structure, this utility model can make high band antenna and low band antenna all obtain the good performance and stable directional diagram.
The technical scheme is as follows: in order to realize the utility model discloses the purpose, the utility model provides a restrain structure of broadband dual-frenquency double polarization base station antenna coupling, include, based on choke coil's double polarization plane dipole low frequency channel antenna, novel frequency selective surface and baffle structure, the low frequency channel is 0.69-0.96 GHz.
Further, in the present invention: the dual-polarized planar dipole low-frequency band antenna based on the choke coil further comprises the choke coil, four square arm ring metal patches and a dielectric substrate, and the four square arm ring metal patches and the dielectric substrate are placed in the middle of the reflecting plate.
Further, in the present invention: the square arm ring metal patches comprise square ring diagonal tangent arcs, opposite sides are provided with grooves, the four square arm ring metal patches are symmetrical in structure, and two arms of the homooscillator corresponding to each polarization are printed on the upper surface and the lower surface of the dielectric substrate respectively.
Further, in the present invention: the choke comprises a thin wire and a conduction band; the notch of the square arm ring metal patch and the choke coil are symmetrically arranged on two surfaces of the dielectric substrate by taking the dielectric substrate as a symmetrical surface.
Further, in the present invention: the novel frequency selective surface comprises a square metal patch with a periodic structure and a dielectric substrate, the square metal patch is loaded between the high-frequency antenna array and the low-frequency antenna array, a circular groove is formed in the square metal patch with the periodic structure, the circular groove is printed on the dielectric substrate, and the dielectric constant of the dielectric substrate is 10.2 mm, and the thickness of the dielectric substrate is 0.635 mm.
Further, in the present invention: the baffle structure comprises a comb-shaped metal strip and an RF-30 dielectric substrate, and is arranged above the novel frequency selection surface; broadband dual polarization plane dipole high frequency channel antenna array is 2 x 2's arrangement, and the high frequency unit is equidistant each other and is arranged, and the interval is 0.8 lambda, and lambda corresponds high frequency central frequency 2.2GHz, and every high frequency antenna unit all includes one baffle structure set up in novel frequency selective surface's central line department.
Has the advantages that: compared with the prior art, the utility model, its beneficial effect is:
(1) the utility model provides a restrain the structure of broadband dual-frenquency dual polarization base station antenna coupling, through loading the choke coil at low frequency antenna unit, utilize the filtering principle, minimize the resonant current of low frequency band antenna under the high order mode of high frequency band frequency;
(2) the low-frequency band antenna is placed below the frequency selection surface, the high-frequency band antenna is placed above the frequency surface, and the low-frequency band antenna radiation and the high-frequency band antenna radiation are not influenced by each other by utilizing the fact that the frequency selection surface has the passband characteristic to the low-frequency band and the ideal reflection characteristic to the high-frequency band;
(3) by loading the baffle plates between the high-frequency-band antenna arrays, mutual coupling between the high-frequency antenna units is reduced, and a high-frequency stable directional diagram is maintained. The three schemes are superposed, so that a directional diagram with stable high-frequency-band antenna array and low-frequency-band antenna and good performance can be obtained, and the suppression of same-frequency and different-frequency coupling of the broadband base station antenna is realized.
Drawings
Fig. 1 is a schematic layered diagram of a structure for suppressing coupling of a broadband dual-band dual-polarized base station antenna according to the present invention;
fig. 2 is a top view and a side view of the structure for suppressing the antenna coupling of the broadband dual-band dual-polarized base station according to the present invention;
fig. 3 is a schematic structural view of the dual-polarized planar dipole low-frequency band antenna with choke coils in the present invention;
fig. 4 is a top view and a side view of a choke structure according to the present invention;
fig. 5 is a schematic structural diagram of a novel frequency selective surface of the present invention;
fig. 6 is a schematic structural diagram of a novel frequency selective surface unit according to the present invention;
fig. 7 is a schematic view of a baffle structure in the present invention;
fig. 8 is an H-plane directional diagram of each frequency point of the low-band antenna when operating in the low frequency band;
fig. 9 is an H-plane pattern of each frequency point of the high-band antenna array when operating in the high frequency band.
Detailed Description
The technical scheme of the utility model is further explained in detail with the attached drawings as follows:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, for the utility model provides a restrain schematic diagram of structure of broadband dual-frenquency dual-polarization base station antenna coupling specifically includes, based on dual-polarization plane dipole low frequency channel antenna 1 of choke, novel frequency selective surface 2 and baffle structure 3, the low frequency channel is 0.69-0.96 GHz.
Specifically, referring to the schematic diagrams of fig. 3 and 4, the choke-based dual-polarized planar dipole low-band antenna 1 further comprises a choke 4, four square-arm-ring metal patches 5 and a dielectric substrate 6. The dual-polarized planar dipole low-frequency band antenna 1 is arranged in the middle of the reflecting plate 14, and the scattering problem caused by cross-frequency band coupling is suppressed through the choke coil 4.
Furthermore, in the utility model, the four square arm ring metal patches 5 are planar metal patches, and the two square arm rings of each oscillator corresponding to each polarization are positioned on the upper and lower surfaces of the medium substrate; the notch 5-1 of the square arm ring metal patch 5 and the choke coil 4 are symmetrically arranged on two surfaces of the dielectric substrate 6 by taking the dielectric substrate as a symmetrical surface.
Further, the size of the square ring of the square arm ring metal patch 5 is 42.01mm × 42.01 mm; the dielectric substrate 6 has a thickness of 3.44mm and a relative dielectric constant of 2.2.
Furthermore, the notch of the square arm ring metal patch 5 and the choke coil 4 are symmetrically arranged on two surfaces of the dielectric substrate 6 by taking the dielectric substrate 6 as a symmetrical surface. The choke 4 further comprises thin wires 7 and conducting strips 8, each thin wire 7 being connected to 2 conducting strips 8. In this embodiment, the choke coil 4, the thin wire 7, the conduction band 8, the square-arm-ring metal patch 5, and the dielectric substrate 6 are modeled by commercial software CST and an equivalent circuit theory, and the size of the choke coil with the optimal performance is obtained by parameter scanning and comparing the central current distribution of the square-arm-ring metal patch 5. According to the simulation result, the size of the conduction band 8 is selected to be 5.4mm by 3mm, i.e. AW is 5.4mm, and W is 3 mm; the thin wire 7 has a size of 0.2mm by 5mm, i.e., a length L of 5mm and a width of 0.2 mm; in this case, the antenna exhibits a good open circuit characteristic at the high-frequency center operating frequency of 2.2GHz and a good short circuit characteristic at the low-frequency center operating frequency of 0.8GHz, and the choke coil size is optimal.
Further, referring to fig. 5, the novel frequency selective surface 2 is loaded between the broadband dual-polarized planar dipole high-band antenna array 13 and the low-frequency antenna 1, and includes a square metal patch 9 of a periodic structure and a dielectric substrate 10, wherein the square metal patch 9 of the periodic structure is a square metal patch with a circular groove inside, and is printed on the dielectric substrate 10, and the dielectric constant of the dielectric substrate 10 is 10.2, and the thickness of the RF-10 dielectric substrate is 0.635 mm. The side length of the square metal patch of the unit structure is 17.5mm, the radius of the circular groove is 8.34mm, and the distance between the units is 18.2 mm. The present embodiment utilizes commercially available software HFSS to inject TE, TM plane waves from 0 ° to 60 ° in the Φ -45 ° plane, and simulation results show that the transmission coefficients in the high frequency band are all below-15 dB, which indicates that the designed frequency selective surface provides excellent reflection characteristics for the high frequency band. Meanwhile, the average transmission coefficient of the frequency selection surface in a low frequency band is-4.6 dB, which shows that the frequency selection surface is used as a non-ideal reflecting surface of the low frequency band and has good transmission characteristic.
The novel frequency selection surface 2 is loaded between the broadband dual-polarized planar dipole high-frequency band antenna array 13 and the dual-polarized planar dipole low-frequency band antenna 1 and serves as a high-frequency band reflector and a low-frequency band transmission plate, wherein the high-frequency band is 1.71G-2.69 GHz.
The broadband dual-polarized planar dipole high-band antenna array 13 is arranged above the novel frequency selective surface 2, and the low-band antenna 1 is arranged at the center of the lower part of the novel frequency selective surface 2.
The broadband dual-polarized planar dipole high-frequency-band antenna array 13 is in a 2 x 2 arrangement mode, the high-frequency units are arranged at equal intervals, the intervals are 0.8 lambda, lambda corresponds to high-frequency central frequency 2.2GHz, each high-frequency antenna unit comprises a baffle structure 3, and the baffle structures 3 are arranged at the central line of the novel frequency selection surface 2.
Further, referring to the illustrations of fig. 6 and 7, the baffle structure 3 of the broadband dual-polarized planar dipole high-band antenna array 13 further includes comb-shaped metal strips 11 and RF-30 dielectric plates 12, and the baffle structure 3 is disposed above the novel frequency selective surface 2; each antenna element of the broadband dual-polarized planar dipole high-band antenna array 13 comprises a baffle structure 3 arranged near the center line of the ground plate. The distance between the baffle structure 3 and the antenna unit is 48.2mm, the thickness of the RF-30 dielectric plate 12 is 0.762mm, the height is lambda/4, lambda corresponds to the high-frequency central frequency of 2.2GHz, the length is 98.46mm, the comb-shaped metal strip 11 is formed by a sawtooth structure with the width of 81mm and a groove with the width of 6.65mm and the depth of 14mm in a periodic arrangement mode, and the length of a metal patch between the grooves is 8.64 mm. The baffle structure can inhibit mutual coupling among the high-frequency antenna units, improve the port isolation and reduce the 3dB wave width of the high-frequency antenna array.
Referring to the schematic diagram of fig. 8, fig. 8 is a directional diagram of an H plane of each frequency point of the low-band antenna in the middle and low frequency band of operation, where phi is 0 °. It can be seen from fig. 8 that low band antenna H face pattern is functional well at each frequency point, illustrates the utility model provides an antenna structure can effectively keep low band radiation characteristic.
Referring to the schematic diagram of fig. 9, fig. 9 is an H-plane directional diagram of each frequency point of the high-band array antenna in the middle and high frequency band operation, where phi is 0 °. It can be seen from figure 9 that high band antenna H face directional diagram is functional well in each frequency point department, explains the utility model provides an antenna structure can effectively improve the scattering problem that high frequency unit and low frequency unit array back coupling brought, and the decoupling effect is good. Therefore, the utility model discloses can effectively restrain the coupling of broadband dual-band dual-polarization base station antenna.
It should be noted that the above-mentioned examples only represent some embodiments of the present invention, and the description thereof should not be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several modifications can be made, and these should fall into the scope of the present invention.
Claims (5)
1. A structure for inhibiting broadband dual-frequency dual-polarization base station antenna coupling is characterized in that: the dual-polarization planar dipole low-frequency band antenna comprises a dual-polarization planar dipole low-frequency band antenna (1) based on a choke coil, a novel frequency selection surface (2) and a baffle structure (3), wherein the low-frequency band is 0.69-0.96 GHz;
the dual-polarized planar dipole low-frequency-band antenna (1) based on the choke coil further comprises the choke coil (4), four square arm ring metal patches (5) and a dielectric substrate (6), and the four square arm ring metal patches are placed in the middle of the reflecting plate (14).
2. The structure for suppressing coupling of a wideband dual-band dual-polarized base station antenna according to claim 1, wherein: the square arm ring metal patches (5) comprise square ring diagonal tangent arcs, opposite sides of the square ring diagonal tangent arcs are provided with grooves, the four square arm ring metal patches (5) are symmetrical in structure, and two arms of the same oscillator corresponding to each polarization are respectively printed on the upper surface and the lower surface of the medium substrate (6).
3. The structure for suppressing antenna coupling of a wideband dual-band dual-polarized base station as claimed in claim 2, wherein: the choke (4) comprises a thin wire (7) and two conduction bands (8); the slotted opening (5-1) of the square arm ring metal patch (5) and the choke coil (4) are symmetrically arranged on two surfaces of the dielectric substrate (6) which is taken as a symmetrical surface.
4. The structure for suppressing antenna coupling of a wideband dual-band dual-polarized base station as claimed in claim 3, wherein: the novel frequency selective surface (2) comprises a square metal patch (9) and a dielectric substrate (10) of a periodic structure, the square metal patch is loaded between a broadband dual-polarized planar dipole high-frequency-band antenna array (13) and a low-frequency antenna (1), a circular groove is formed in the square metal patch (9) of the periodic structure, the circular groove is printed on the dielectric substrate (10), and the dielectric constant of the dielectric substrate (10) is 10.2, and the thickness of the dielectric substrate is 0.635 mm.
5. The structure for suppressing antenna coupling of a wideband dual-band dual-polarized base station as claimed in claim 4, wherein: the baffle structure (3) comprises a comb-shaped metal strip (11) and an RF-30 medium substrate (12), and the baffle structure (3) is arranged above the novel frequency selection surface (2); the broadband dual-polarized planar dipole high-frequency-band antenna array (13) is in a 2 x 2 arrangement mode, the high-frequency units are arranged at equal intervals, the intervals are 0.8 lambda, lambda corresponds to high-frequency central frequency 2.2GHz, and each high-frequency antenna unit comprises a baffle plate structure (3) arranged at the central line of the novel frequency selection surface (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120173464.8U CN215184541U (en) | 2021-01-22 | 2021-01-22 | Structure for inhibiting coupling of broadband dual-frequency dual-polarized base station antenna |
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| CN202120173464.8U CN215184541U (en) | 2021-01-22 | 2021-01-22 | Structure for inhibiting coupling of broadband dual-frequency dual-polarized base station antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115313065A (en) * | 2022-09-29 | 2022-11-08 | 微网优联科技(成都)有限公司 | Common-caliber base station antenna array |
| WO2023240481A1 (en) * | 2022-06-15 | 2023-12-21 | 京东方科技集团股份有限公司 | Dual-frequency antenna and electronic device |
| CN117559135A (en) * | 2024-01-11 | 2024-02-13 | 福州福大信捷天线技术有限公司 | Big dipper high accuracy anti-interference array antenna |
-
2021
- 2021-01-22 CN CN202120173464.8U patent/CN215184541U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023240481A1 (en) * | 2022-06-15 | 2023-12-21 | 京东方科技集团股份有限公司 | Dual-frequency antenna and electronic device |
| CN115313065A (en) * | 2022-09-29 | 2022-11-08 | 微网优联科技(成都)有限公司 | Common-caliber base station antenna array |
| CN115313065B (en) * | 2022-09-29 | 2023-01-03 | 微网优联科技(成都)有限公司 | Common-caliber base station antenna array |
| CN117559135A (en) * | 2024-01-11 | 2024-02-13 | 福州福大信捷天线技术有限公司 | Big dipper high accuracy anti-interference array antenna |
| CN117559135B (en) * | 2024-01-11 | 2024-04-05 | 福州福大信捷天线技术有限公司 | Big dipper high accuracy anti-interference array antenna |
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