CN110265778B - Dual-frequency filter antenna based on SIW resonant cavity - Google Patents
Dual-frequency filter antenna based on SIW resonant cavity Download PDFInfo
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- CN110265778B CN110265778B CN201910489141.7A CN201910489141A CN110265778B CN 110265778 B CN110265778 B CN 110265778B CN 201910489141 A CN201910489141 A CN 201910489141A CN 110265778 B CN110265778 B CN 110265778B
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- 239000000758 substrate Substances 0.000 claims abstract description 73
- 239000002184 metal Substances 0.000 claims abstract description 63
- 239000000523 sample Substances 0.000 claims abstract description 28
- 230000005855 radiation Effects 0.000 claims abstract description 18
- 230000008878 coupling Effects 0.000 claims abstract description 9
- 238000010168 coupling process Methods 0.000 claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims description 10
- 238000012545 processing Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005388 cross polarization Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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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Abstract
The invention discloses a dual-frequency filter antenna based on a SIW resonant cavity, which comprises an upper medium substrate, a lower medium substrate, a T-shaped coupling probe, an SMA feed connector, a metal patch, a metal floor, a metal short-circuit column and a square radiation patch carved with a U-shaped groove, wherein the upper medium substrate is provided with a plurality of U-shaped grooves; the upper layer dielectric substrate is attached to the lower layer dielectric substrate, a square radiation patch carved with a U-shaped groove is printed on the upper surface of the upper layer dielectric substrate, the metal patch and the metal floor cover the upper surface and the lower surface of the lower layer dielectric substrate respectively, the SMA feed connector is arranged on the lower layer dielectric substrate and connected with the metal patch on the upper surface of the lower layer dielectric substrate, and the metal short-circuit column is embedded in the lower layer dielectric substrate to form a rectangle; the metal short-circuit column embedded in the lower dielectric substrate is connected with the metal floor positioned on the lower surface of the lower dielectric substrate and the metal patch positioned on the upper surface of the lower dielectric substrate to form a resonant cavity. The invention has compact structure, better selectivity, low processing cost and good radiation characteristic.
Description
Technical Field
The invention relates to the field of wireless communication antennas, in particular to a dual-frequency filter antenna based on a SIW resonant cavity.
Background
The substrate integrated waveguide (Substrate Integrated Waveguide, SIW) is a novel transmission line structure, and the SIW is widely applied to the field of filters due to the characteristics of high quality factor (high Q) and small loss. Compared with the traditional microstrip filter, the SIW resonant cavity has higher selectivity and smaller insertion loss. And because of its small size, light weight and easy integration, SIW is applied to antennas, combiners, power splitters, etc.
The antenna feeder system is the most important part of the front end of the radio frequency, and is generally required to have the characteristics of multiple frequency bands, high selectivity, high gain, small size and the like, while the traditional design is to separately design three components of the antenna feeder system, an antenna, a filter and a duplexer, and then connect the three components by adopting 50 omega feeder lines, so that the antenna feeder system has the defects of large size, high loss, large weight and the like.
The filter antenna is a new technology proposed in recent years, and the core idea is to design the filter and the antenna together, and treat the antenna as the last stage of the filter, so that a connection line of 50Ω is no longer required between the antenna and the filter. When the antenna is in a narrow band, the bandwidth of the antenna is further improved by adopting the design of a filtering antenna.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a dual-frequency filtering antenna based on a SIW resonant cavity. The invention has the advantages of simple structure, small loss, light weight, easy processing and the like, and has the characteristic of being capable of forming a large array.
The aim of the invention can be achieved by the following technical scheme:
a dual-frequency filter antenna based on a SIW resonant cavity comprises an upper layer dielectric substrate, a lower layer dielectric substrate, a T-shaped coupling probe, an SMA feed connector, a metal patch, a metal floor, a metal short-circuit column and a square radiation patch carved with a U-shaped groove;
the upper dielectric substrate is attached to the lower dielectric substrate, a square radiation patch carved with a U-shaped groove is printed on the upper surface of the upper dielectric substrate, a metal patch and a metal floor cover the upper surface and the lower surface of the lower dielectric substrate respectively, an SMA feed connector is arranged on the lower dielectric substrate and connected with the metal patch on the upper surface of the lower dielectric substrate, and a metal short-circuit column is embedded in the lower dielectric substrate to form a rectangle; the metal short-circuit columns embedded in the lower dielectric substrate are respectively connected with the metal floor positioned on the lower surface of the lower dielectric substrate and the metal patch positioned on the upper surface of the lower dielectric substrate to form a resonant cavity; the T-shaped feed probe consists of a horizontal microstrip line and a vertical feed probe, wherein the horizontal microstrip line is printed on the upper surface of the upper medium substrate, the vertical feed probe is embedded in the two medium plates, one end of the vertical feed probe is connected with the center of the horizontal microstrip line, and the other end of the vertical feed probe is connected with the metal floor of the lower layer.
Further, the U-shaped groove of the square radiation patch with the U-shaped groove is carved on the edge of the radiation patch, so that two frequencies of the dual-frequency filter antenna are as close as possible.
Further, the size of the upper dielectric substrate is smaller than the size of the lower dielectric substrate surrounded by the metal shorting post.
Further, in order to prevent the metal floor from contacting the SMA feed connector inner core, a circular groove is engraved at the metal floor.
Further, the metal shorting posts embedded in the underlying dielectric substrate are spaced apart by a distance represented by formula d 2 /d 3 Less than or equal to 2 and d 3 /λ 0 Less than or equal to 0.1, preventing electromagnetic wave leakage; wherein d 2 Represents the diameter of the metal shorting column, d 3 Represents the distance lambda between the circle centers of adjacent metal short-circuit columns 0 Representing the wavelength of free space.
Further, the T-shaped coupling probe and the SMA feed connector are staggered towards two sides of the SIW resonant cavity as far as possible, so that the SMA feed connector is prevented from being overlapped with the upper medium substrate, and the working difficulty is reduced.
Further, the metal short-circuit columns positioned in the resonant cavity of the lower dielectric substrate are symmetrically distributed in the middle of the lower dielectric substrate. The length and width of the rectangular shape of the metal shorting post determine the two resonant frequencies of the resonant cavity, so the distance from the center is determined by the operating frequency.
Further, the length of the horizontal microstrip line of the T-shaped feed probe is equal to the side length of the square radiation patch.
Compared with the prior art, the invention has the following beneficial effects:
1. the dual-frequency filter antenna provided by the invention does not need redundant feed networks or matching circuits, and has the advantages of simple structure, small size and low profile; and the gain has two radiation zero points on the curve of the gain changing along with the frequency, so that the gain has good selectivity.
2. According to the invention, in order to widen the bandwidth, the resonant cavity is overlapped on the lower dielectric substrate to form a three-order or higher-order dual-frequency filter antenna, and the antenna can be used as a basic unit of the antenna for array, so that a large research space is provided.
3. The invention adopts the SIW dual-frequency resonant cavity and the dual-frequency antenna to design together, can improve the selectivity of an antenna system, and has the advantages of small size and light weight due to the good integration of the SIW.
Drawings
Fig. 1 is a top view and a side view of a SIW resonator-based dual-frequency filtering antenna.
Fig. 2 is a schematic diagram of specific dimensions of a dual-frequency filtering antenna based on a SIW resonant cavity in this embodiment.
Fig. 3 is a top view of a lower dielectric substrate in a SIW cavity.
Fig. 4 is a top view of an upper dielectric substrate.
Fig. 5 is a graph of S-parameter simulation results of a dual-frequency filter antenna based on a SIW resonant cavity in this embodiment.
Fig. 6 is a far-field gain curve diagram of the vertical antenna center of a dual-frequency filtering antenna based on a SIW resonant cavity according to the present embodiment.
Fig. 7 is a far field pattern of a dual-frequency filtering antenna based on a SIW resonant cavity at f=3.2 GHz in this embodiment.
Fig. 8 is a far-field pattern of a dual-frequency filter antenna based on a SIW resonator in this embodiment at f=3.68 GHz.
In the figure, a 1-upper layer dielectric substrate, a 2-lower layer dielectric substrate, a metal floor of a 3-SIW resonant cavity, a metal patch of a 4-SIW resonant cavity, a 5-SMA feed connector, a vertical part of a 6-T type coupling probe, a horizontal microstrip part of a 7-T type coupling probe, an 8-square radiation patch carved with a U-shaped groove and a short circuit metal column of a 9-SIW resonant cavity.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Examples
Fig. 1 shows a schematic structural diagram of a dual-frequency filtering antenna based on a SIW resonant cavity, where the antenna includes an upper dielectric substrate 1, a lower dielectric substrate 2, a T-shaped coupling probe, an SMA feed connector 5, a metal patch 4, a metal floor 3, a metal shorting post 9, and a square radiation patch 8 with a U-shaped groove;
the upper dielectric substrate is attached to the lower dielectric substrate, a square radiation patch carved with a U-shaped groove is printed on the upper surface of the upper dielectric substrate, a metal patch and a metal floor cover the upper surface and the lower surface of the lower dielectric substrate respectively, an SMA feed connector is arranged on the lower dielectric substrate and connected with the metal patch on the upper surface of the lower dielectric substrate, and a metal short-circuit column is embedded in the lower dielectric substrate to form a rectangle; the metal short-circuit columns embedded in the lower dielectric substrate are respectively connected with the metal floor positioned on the lower surface of the lower dielectric substrate and the metal patch positioned on the upper surface of the lower dielectric substrate to form a resonant cavity; the T-shaped feed probe consists of a horizontal microstrip line and a vertical feed probe, wherein the horizontal microstrip line is printed on the upper surface of the upper medium substrate, the vertical feed probe is embedded in the two medium plates, one end of the vertical feed probe is connected with the center of the horizontal microstrip line, and the other end of the vertical feed probe is connected with the metal floor of the lower layer.
Fig. 2 is a schematic diagram showing the dimensions of a portion of the dual-frequency filtering antenna based on the SIW resonant cavity in this embodiment. The upper and lower dielectric substrates are Rogers4003c with relative dielectric constant of 3.55 and thickness h of the two plates 1 And h 2 0.813mm,1.524mm, respectively, the remaining parameters l 1 ,l 2 ,l 3 ,l 4 ,l 5 ,l 6 ,w 1 ,w 2 ,w 3 ,,d 1 ,d 2 ,d 3 ,s 1 80mm,60.5mm,35mm,23mm,10mm,9mm,49.8mm,1mm,1.5mm,0.6mm,2mm, 0.8mm, respectively, the overall antenna size being 80x80x2.34mm 3 。
Fig. 3 and 4 are electrical structural diagrams of the upper surface of the lower dielectric substrate and the upper surface of the upper dielectric, respectively. The metal patch 4 on the upper surface of the lower dielectric substrate is engraved with a circular groove around the vertical portion 6 of the T-shaped feeding probe to prevent the vertical probe 6 from shorting with the metal patch 4. The horizontal microstrip line 7 of the T-shaped coupling probe is flush with the side length of the U-shaped slot to effectively feed energy into the antenna.
In addition, the working center frequencies of the antenna are 3.2GHz and 3.68GHz respectively, the bandwidths are 83MHz and 56MHz respectively, and the S parameters of the antenna are shown in figure 5. In both operating bands, the antenna maximum gain is 5.8dBi and 4.44dBi at the vertical antenna center, and the gain curve as a function of frequency is shown in fig. 6, perpendicular to the antenna center. The cross polarization ratios were 40dBi and 23dBi, respectively, and the patterns of phi=0° and phi=90° for the antennas at 3.2GHz and 3.68GH are shown in fig. 7 and 8.
From the above description, it can be seen that the compact dual-frequency filtering antenna based on the SIW resonant cavity has a simple structure, does not need an additional feed matching network or a 50 Ω feed connection line, and has a relatively high quality factor of the SIW resonant cavity, so that the overall loss of the antenna is reduced. The antenna selectivity is improved due to the fact that there are two radiation nulls on the antenna gain versus frequency curve. In addition, the antenna unit has very simple structure and feeding, and can be used as a unit of a large array.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (5)
1. The dual-frequency filter antenna based on the SIW resonant cavity is characterized by comprising an upper dielectric substrate, a lower dielectric substrate, a T-shaped coupling probe, an SMA feed connector, a metal patch, a metal floor, a metal short-circuit column and a square radiation patch carved with a U-shaped groove;
the upper dielectric substrate and the lower dielectric substrate are attached, the square radiation patch is printed on the upper surface of the upper dielectric substrate, a U-shaped groove of the square radiation patch is engraved on the edge of the square radiation patch, the upper surface and the lower surface of the lower dielectric substrate are respectively covered by the metal patch and the metal floor, the SMA feed connector is arranged on the lower dielectric substrate, the SMA feed connector is connected with the metal patch on the upper surface of the lower dielectric substrate, and the metal short-circuit column is embedded in the lower dielectric substrate to form a rectangle; the metal short-circuit columns embedded in the lower dielectric substrate are respectively connected with the metal floor positioned on the lower surface of the lower dielectric substrate and the metal patch positioned on the upper surface of the lower dielectric substrate to form a resonant cavity; the T-shaped feed probe consists of a horizontal microstrip line and a vertical feed probe, wherein the horizontal microstrip line is printed on the upper surface of the upper medium substrate, the vertical feed probe is embedded in the two medium plates, one end of the vertical feed probe is connected with the center of the horizontal microstrip line, and the other end of the vertical feed probe is connected with the metal floor of the lower layer;
the size of the upper dielectric substrate is smaller than the size of the lower dielectric substrate surrounded by the metal shorting post; the length of the horizontal microstrip line of the T-shaped feed probe is equal to the side length of the square radiation patch.
2. The dual-band filtering antenna of claim 1, wherein the T-shaped coupling probe and SMA feed joint are offset as far as possible toward both sides of the SIW resonator.
3. The dual-band filter antenna as claimed in claim 1, wherein the metal shorting posts embedded in the underlying dielectric substrate are spaced apart by a distance according to the formulad 2 /d 3 Less than or equal to 2 andd 3 /λ 0 determining less than or equal to 0.1; wherein,d 2 representing the diameter of the metal shorting post,d 3 represents the distance between the circle centers of adjacent metal short-circuit columns,λ 0 representing the wavelength of free space.
4. The dual-frequency filter antenna based on the SIW resonant cavity of claim 1, wherein the metal shorting posts in the resonant cavity of the lower dielectric substrate are symmetrically distributed in the middle of the lower dielectric substrate; the length and width of the rectangular shape of the metal shorting post determine the two resonant frequencies of the resonant cavity, so the distance from the center is determined by the operating frequency.
5. The SIW resonator-based dual-frequency filter antenna of claim 1, wherein the metal floor is carved with circular grooves.
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| CN201910489141.7A CN110265778B (en) | 2019-06-06 | 2019-06-06 | Dual-frequency filter antenna based on SIW resonant cavity |
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| CN201910489141.7A CN110265778B (en) | 2019-06-06 | 2019-06-06 | Dual-frequency filter antenna based on SIW resonant cavity |
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| CN110265778B true CN110265778B (en) | 2024-03-22 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111541027A (en) * | 2020-04-23 | 2020-08-14 | 西安电子科技大学 | Multimode resonance broadband antenna based on substrate integrated waveguide resonant cavity |
| US11575206B2 (en) | 2020-06-19 | 2023-02-07 | City University Of Hong Kong | Self-filtering wideband millimeter wave antenna |
| CN112563724A (en) * | 2020-12-04 | 2021-03-26 | 西安电子科技大学 | Low-profile half-mode substrate integrated waveguide filter antenna with high frequency selectivity |
| WO2022221983A1 (en) * | 2021-04-19 | 2022-10-27 | 京东方科技集团股份有限公司 | Antenna structure and electronic device |
| CN113506987B (en) * | 2021-06-24 | 2022-06-14 | 华南理工大学 | Broadband high-gain circularly polarized filter antenna and wireless communication equipment |
| CN115173032B (en) * | 2022-06-29 | 2024-05-28 | 北京理工大学 | SIW miniaturized filter antenna with high selectivity |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014148708A1 (en) * | 2013-03-22 | 2014-09-25 | 중앙대학교 산학협력단 | Substrate-integrated waveguide antenna |
| JP2017098782A (en) * | 2015-11-25 | 2017-06-01 | 株式会社Ｎｔｔドコモ | Antenna device |
| CN108987924A (en) * | 2018-07-16 | 2018-12-11 | 西安电子科技大学 | Substrate integration wave-guide bimodulus filter antenna with more radiation zeros |
| CN109728425A (en) * | 2018-12-18 | 2019-05-07 | 南通大学 | Dual polarization filters paster antenna |
| CN210092342U (en) * | 2019-06-06 | 2020-02-18 | 华南理工大学 | Double-frequency filtering antenna based on SIW resonant cavity |
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- 2019-06-06 CN CN201910489141.7A patent/CN110265778B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014148708A1 (en) * | 2013-03-22 | 2014-09-25 | 중앙대학교 산학협력단 | Substrate-integrated waveguide antenna |
| JP2017098782A (en) * | 2015-11-25 | 2017-06-01 | 株式会社Ｎｔｔドコモ | Antenna device |
| CN108987924A (en) * | 2018-07-16 | 2018-12-11 | 西安电子科技大学 | Substrate integration wave-guide bimodulus filter antenna with more radiation zeros |
| CN109728425A (en) * | 2018-12-18 | 2019-05-07 | 南通大学 | Dual polarization filters paster antenna |
| CN210092342U (en) * | 2019-06-06 | 2020-02-18 | 华南理工大学 | Double-frequency filtering antenna based on SIW resonant cavity |
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