CN108847521A - Broadband fed microstrip filter antenna - Google Patents
Broadband fed microstrip filter antenna Download PDFInfo
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- CN108847521A CN108847521A CN201810419982.6A CN201810419982A CN108847521A CN 108847521 A CN108847521 A CN 108847521A CN 201810419982 A CN201810419982 A CN 201810419982A CN 108847521 A CN108847521 A CN 108847521A
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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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
Abstract
The present invention relates to broadband fed microstrip filter antennas.Conventional microstrip aerial band width, no gain select characteristic.Antenna proposed by the invention includes three layers of medium substrate, air layer between upper layer medium substrate and intermediate medium substrate, positioned at the primary radiation patch of intermediate medium upper surface of base plate, parasitic patch positioned at upper layer medium substrate lower surface, the floor with a pair of slits and feeding microstrip line of a pair with minor matters and resonant slot positioned at layer dielectric base lower surface；The parasitic patch of the primary radiation patch and dielectric overlay generates resonance, provides the radiation passband of broadband and high-gain, while generating the gain zero point of passband top edge.The present invention uses differential feed technology, further improves the radiation characteristic of antenna, and is easily achieved miniaturization, Integration Design.Antenna structure provided by the invention is simple, broader bandwidth, and selectivity is good, PCB technology processing can be used, processing cost is low, can be mass-produced.
Description
Technical field
The present invention relates to wireless communications antenna field, in particular to a kind of micro-strip of broadband feed form filters day
Line can be used as the antenna of radio frequency transceiver front end, be widely used in the wireless communications such as mobile communication, satellite communication and radar system
In system.
Background technique
With the rapid development of wireless communication technique, the quantity and complexity of radio-frequency front-end system structure are sharply increased, tool
There is the multifunction module of miniaturization, integration characteristics receive more and more attention.Antenna and filter are radio-frequency front-ends
Two important devices and maximum two devices of size, generally use 50 Ω transmission lines and connect use, will lead in this way
The volume of mismatch and radio-frequency front-end entirety between two kinds of devices is big, and loss is big.In order to overcome these problems, researcher
Propose the filter antenna that can be achieved at the same time radiation and filter function.
Difference channel is widely used in penetrating due to having many advantages, such as that linearity height, strong antijamming capability, dynamic range are big
In frequency front end system.The mode that most of filter antenna is fed using traditional single port at present, when itself and differential radio frequency
When front end integrates, need to be balanced using barron structure will increase radio-frequency front-end with non-equilibrium conversion, the introducing of barron structure
Loss, increases the overall dimensions of structure.In addition, the design of filter antenna mainly uses collaborative design method at present, tied in broadband
In structure, multistage resonator need to be added, more losses can be introduced, reduce antenna gain.
From the foregoing, it will be observed that in the prior art the implementation method of shorter mention differential feed filter antenna, especially structure it is simple,
Compact broadband feeds filter antenna.
Summary of the invention
The purpose of the present invention is being directed to existing conventional microstrip aerial band width, no gain selects characteristic, provides a kind of broadband
Differential feed micro-strip filter antenna, it is able to achieve wider bandwidth of operation and good gain selection characteristic.
The technical solution for realizing the aim of the invention is as follows：
A kind of broadband fed microstrip filter antenna, three layers of medium substrate including identical length and width dimensions, top dielectric
It is carved with a parasitic patch (5) in the lower surface middle of substrate (1)；Interlayer substrate (2) and upper layer medium substrate there are
The air gap, for separating two layers of medium substrate；A radiation patch is carved among interlayer substrate (2) upper surface
(6)；Between interlayer substrate (2) and layer dielectric substrate (3), has and make with the metal layer (4) of the same size of medium substrate
For ground plane；
It is carved with a pair of of axial symmetry feeding microstrip line (8), the symmetry axis of feeding microstrip line in the lower surface of layer dielectric substrate (3)
It is located in a straight line with the intersection point of straight line where fed microstrip with parasitic patch (5) center, radiation patch (6) center；It is described
Two feeding microstrip lines (8) be respectively equipped with perpendicular metal strip (as minor matters), the metal strip connected can be in day
The top edge of line gain curve increases zero point, improves the selection characteristic of top edge, and the length and width of metal strip determines gain zero
The frequency that point generates.It is carved with a U-type groove on two feeding microstrip lines (8), can be produced in the lower edge of antenna gain curve
Raw zero point, the length of U-type groove determine the frequency that gain zero point generates, the filter effect of widths affect antenna.
A pair of axisymmetric coupling gap (7) (as resonant slot) is provided on metal covering (4), shape can be H-type, I
Type, U-shaped etc., size influence the impedance matching property of antenna.The symmetry axis and its center place straight line of two couplings gap (7)
Intersection point be located in a straight line with parasitic patch (5) center, radiation patch (6) center；
Parasitic patch (5) and radiation patch (6) can be round, square or rectangle etc., and size determines antenna
Working frequency, the frequency that generates of bandwidth of operation and gain curve top edge zero point.
The bandwidth of the thickness effect antenna of the air gap.
Preferably, the center of parasitic patch (5) is overlapped with the center of upper layer medium substrate (1).
The course of work：The electric feed signal of constant amplitude reverse phase is inputted simultaneously by two feeding microstrip lines (8), forms differential feed
Structure.Electromagnetic wave is coupled to the radiation patch (6) on interlayer plate (2) by two couplings gap (7), then passes through sky
Gas medium is transmitted to the parasitic patch (5) on top dielectric plate (1), finally radiate energy to form antenna.Work as frequency
When reaching 3.2GHz, the U-type groove on feeding microstrip line (8) has concentrated a large amount of electromagnetic wave, so that final basic without electricity
Magnetic wave reaches radiation patch (6), to produce the gain zero point in low-frequency band；When frequency increases to 6.4GHz, two
Electric current on a patch reaches reversed counteracting, generates second gain zero point；Perpendicular metal on feeding microstrip line (8)
Item, be frequency in 8.15GHz when generate third gain zero point；The effect for finally realizing filtering, will be unwanted
Signal is inhibited outside in band.
Compared with prior art, the present invention its remarkable advantage is：
1) broadband fed microstrip filter antenna proposed by the present invention, using differential feed technology, can directly with difference
It is integrated to divide radio-frequency front-end, so that the directional diagram in working band is stable and symmetrical, cross polarization has obtained better inhibition, realizes
The effect in broadband, while being easy to integrated with difference active device.
2) broadband fed microstrip filter antenna proposed by the present invention is adopted compared to the filter antenna of more traditional tandem type
The mode that metal strip is added with U-type groove, directly adds filter structure on the feeding microstrip line of antenna, so that the body of antenna entirety
Product greatly reduces, and not additional impedance matching network reduces insertion loss, and Out-of-band rejection effect is obvious, with interior gain
Steadily, the miniaturization for realizing radio-frequency front-end meets the requirement at present to communication equipment miniaturization.
3) broadband fed microstrip filter antenna structure proposed by the present invention is simple, and handling ease, cost is relatively low, thus
It can be mass produced.
Detailed description of the invention
Fig. 1 is broadband fed microstrip filter antenna schematic perspective view of the present invention；
Fig. 2 is broadband fed microstrip filter antenna side view of the present invention；
Fig. 3 is the top layer dielectric-slab bottom view of broadband fed microstrip filter antenna of the present invention；
Fig. 4 is the interlayer plate structural schematic diagram of broadband fed microstrip filter antenna of the present invention；
Fig. 5 is the schematic diagram of the earth plate of broadband fed microstrip filter antenna of the present invention；
Fig. 6 is the underlying dielectric plate structural schematic diagram of broadband fed microstrip filter antenna of the present invention；
Fig. 7 is the enlarged drawing of U-type groove on the feeding microstrip line of broadband fed microstrip filter antenna of the present invention；
Fig. 8 is the reflection coefficient and gain curve simulation result diagram of broadband fed microstrip filter antenna of the present invention；
Fig. 9 is the simulation result diagram of broadband fed microstrip filter antenna antenna pattern in 4.9GHz of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.Broadband fed microstrip combined with Figure 1 and Figure 2,
Filter antenna, including upper layer medium substrate 1, interlayer substrate 2, layer dielectric substrate 3, ground plane 4, rectangular parasitic patch
5, square-shaped radiation patch 6, coupling gap 7, feeding microstrip line 8.
For medium substrate 1 in top layer, medium substrate 2 has certain thickness the air gap to separate between the two in centre, is situated between
Matter substrate 3 is separated in lowest level by ground plane 4 and medium substrate 2.Rectangular parasitic patch 5 is located at 1 lower surface of medium substrate
Center, square-shaped radiation patch 6 are located at the center of 2 upper surface of medium substrate.Two H-types coupling gap 7 is engraved on ground plane 4, and
It is symmetrical about Y-axis.Two feeding microstrip lines 8 are located at 3 lower surface of medium substrate, symmetrical about Y-axis, two 8 ends of feeding microstrip line
A vertical metal item is loaded respectively, is carved with a U-shaped gap respectively on two feeding microstrip lines 8.
The 1 relative dielectric constant ε of medium substraterIt is 1~10.2, thickness h1For<0.25λ；Medium substrate 2 is with respect to dielectric
Constant εrIt is 2.2~10.2, thickness h2For the λ of 0.01 λ~0.1；3 relative dielectric constant ε of medium substraterIt is 2.2~10.2, thickness
h3For the λ of 0.01 λ~0.1；The thickness h of the air gap4For the λ of 0.03 λ~0.2；The length L of medium substrate1With width W1For 0.9 λ~
1.5λ；Wherein λ is free space wavelength.
The length L of parasitic patch 52With width W2For 0.5 λg~0.75 λg, wherein λgIt is the waveguide wavelength in medium substrate 1；
The length L of radiation patch 63With width W3For 0.4 λg~0.48 λg, wherein λgIt is the waveguide wavelength in medium substrate 2；Two couplings
The respective total length in gap 7 is (sl1×2+sl2) it is 0.35 λg~0.45 λg, width sw1And sw2For 0.01 λg~0.05 λg,
Middle λgIt is the waveguide wavelength in medium substrate 2；Total length i.e. (the Lf of the vertical metal item loaded on two feeding microstrip lines 82×2
+Wf1) it is 0.45 λg~0.55 λg, width Wf2For 0.01 λg~0.05 λg, wherein λgIt is the waveguide wavelength in medium substrate 3；Two
The gap total length i.e. (Lf opened on feeding microstrip line 83×2+Wf3) it is 0.9 λg~1.1 λg, width Wf4For 0.01 λg~0.05
λg, wherein λgIt is the waveguide wavelength in medium substrate 3.
Refinement explanation is carried out to the device of the invention details and working condition below with reference to embodiment.
In conjunction with Fig. 2, the 1 model FR4_epoxy of medium substrate of selection, relative dielectric constant 4.4, thickness h1For
0.5mm (0.008 λ), length L1With width W1It is 60mm (0.98 λ)；2 relative dielectric constant of medium substrate of selection is 2.65,
Thickness h2For 1.575mm (0.025 λ), the 3 model FR4_epoxy of medium substrate of selection, relative dielectric constant 4.4, thickness
h1For 1mm (0.016 λ)；Air gap thickness among medium substrate 1 and medium substrate 2 is 5mm (0.08 λ), and wherein λ is
61.2mm (λ is the free space wavelength under 4.9GHz centre frequency).
In conjunction with Fig. 3, the length L of parasitic patch 52With width W2It is 19mm (0.65 λg), wherein λgFor 29.17mm (λgFor
Operation wavelength of the medium substrate 1 under 4.9GHz centre frequency).
In conjunction with Fig. 4, the length L of radiation patch 62With width W2It is 16.5mm (0.44 λg), wherein λgFor 37.6mm (λgFor
Operation wavelength of the medium substrate 1 under 4.9GHz centre frequency).
In conjunction with Fig. 5, the length sl in gap 7 is coupled1For 4mm, sl2For 7mm, total length is (sl1×2+sl2) it is 15mm
(0.40λg), width sw1For 1mm (0.026 λg), sw2For 0.6mm (0.016 λg), the distance between two coupling gaps 7 d is
10mm(0.26λg), wherein λgFor 37.6mm (λgFor operation wavelength of the medium substrate 1 under 4.9GHz centre frequency).
In conjunction with Fig. 6 and Fig. 7, the length Lf of the vertical metal item loaded on feeding microstrip line 82For 6.55mm, Wf1For
1.9mm, total length are (Lf2×2+Wf1) it is 15mm (0.51 λg), width Wf2For 1mm (0.03 λg)；It is opened on feeding microstrip line 8
The length Lf in gap3For 14mm, Wf3For 1.2mm, total length is (Lf2×2+Wf1) it is 29.2mm (1.00 λg), width Wf4For
0.3mm(0.01λg), wherein λgFor 29.17mm (λgFor operation wavelength of the medium substrate 3 under 4.9GHz centre frequency).
In conjunction with Fig. 8, working band of the broadband fed microstrip filter antenna differential mode reflection coefficient lower than -10dB is
4.1GHz~5.86GHz, relative bandwidth 35.3%.Maximum gain is the 7.98dBi at 5GHz, gain in passband in working band
Steadily.A zero point is obtained at gain curve lower edge 3.2GHz, and an increasing is respectively obtained at top edge 6.4GHz and 8.15GHz
Beneficial zero point.Out-of-band rejection degree is greater than 20dB, there is good filtering characteristic.
In conjunction with Fig. 9, broadband fed microstrip filter antenna can obtain symmetrical antenna pattern in the face E and the face H,
And the cross polarization in the face E and the face H is respectively less than -45dB, it is seen that antenna has good radiance in working band.
From the foregoing, it will be observed that the present invention is based on the wideband microband filter antennas of differential feed technology, it can be achieved that broadband character, passband
Interior gain stabilization, antenna pattern is symmetrical and cross polarization is low, it can be achieved that the outer gain zero point of multiple bands, Out-of-band rejection degree are greater than
20dB is, it can be achieved that preferable filtering characteristic.
Claims (9)
1. broadband fed microstrip filter antenna, it is characterised in that including three layers of medium substrate setting up and down；Top dielectric
It is carved with a parasitic patch (5) in the lower surface middle of substrate (1)；Interlayer substrate (2) and upper layer medium substrate there are
The air gap, for separating two layers of medium substrate；A radiation patch is carved among interlayer substrate (2) upper surface
(6)；Metal layer (4) are equipped between interlayer substrate (2) and layer dielectric substrate (3), as ground plane；
It is carved with a pair of axisymmetric feeding microstrip line (8), pair of feeding microstrip line in the lower surface of the layer dielectric substrate (3)
Axis and the intersection point of straight line where fed microstrip is claimed to be located in a straight line with parasitic patch (5) center, radiation patch (6) center；
Two feeding microstrip lines (8) are respectively equipped with perpendicular metal strip, and the metal strip connected can be in antenna gain
The top edge of curve increases zero point, improves the selection characteristic of top edge；It is carved with a U-type groove on two feeding microstrip lines (8),
Zero point can be generated in the lower edge of antenna gain curve；
Be provided with a pair of axisymmetric coupling gap (7) on the metal covering (4), two couple the symmetry axis of gap (7) with couple
The intersection point of straight line is located in a straight line with parasitic patch (5) center, radiation patch (6) center where slit centers.
2. broadband fed microstrip filter antenna as described in claim 1, it is characterised in that parasitic patch (5) and radiation patch
The size of piece (6) determines the frequency that working frequency, bandwidth of operation and the gain curve top edge zero point of antenna generate.
3. broadband fed microstrip filter antenna as described in claim 1, it is characterised in that the thickness effect of the air gap
The bandwidth of antenna.
4. broadband fed microstrip filter antenna as described in claim 1, it is characterised in that the center of parasitic patch (5) with
The center of upper layer medium substrate (1) is overlapped.
5. broadband fed microstrip filter antenna as described in claim 1, it is characterised in that the length and width of metal strip
Determine the frequency that gain zero point generates.
6. broadband fed microstrip filter antenna as described in claim 1, it is characterised in that the length of U-type groove determines gain
The frequency that zero point generates, the filter effect of widths affect antenna.
7. broadband fed microstrip filter antenna as described in claim 1, it is characterised in that the size shadow of coupling gap (7)
Ring the impedance matching property of antenna.
8. broadband fed microstrip filter antenna as described in claim 1, it is characterised in that the feed of a pair of of constant amplitude reverse phase
Signal inputs simultaneously from two feeding microstrip lines, forms differential feed structure.
9. broadband fed microstrip filter antenna as described in claim 1, it is characterised in that parasitic patch (5) is located at upper layer
The lower surface of medium substrate (1), for realizing the high gain characteristics in antenna operating band.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810419982.6A CN108847521B (en) | 2018-05-04 | 2018-05-04 | Broadband differential feed microstrip filter antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810419982.6A CN108847521B (en) | 2018-05-04 | 2018-05-04 | Broadband differential feed microstrip filter antenna |
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| CN108847521B CN108847521B (en) | 2020-03-17 |
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Cited By (23)
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| CN110034395A (en) * | 2019-03-07 | 2019-07-19 | 中山大学 | A kind of wideband filtered antenna and its manufacturing method based on mixing feed |
| CN110112556A (en) * | 2019-05-17 | 2019-08-09 | 华南理工大学 | A kind of Multifunctional radio-frequency device that dual-polarized patch antenna is merged with filter |
| CN110571529A (en) * | 2019-09-16 | 2019-12-13 | 西安电子科技大学昆山创新研究院 | Millimeter wave ultra-wideband high-gain laminated differential antenna |
| CN110600870A (en) * | 2019-09-29 | 2019-12-20 | 华南理工大学 | 5G large-frequency-ratio antenna with high harmonic suppression |
| CN110911805A (en) * | 2019-10-19 | 2020-03-24 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Miniaturized dual-frequency dual-polarization 5G base station antenna with high isolation and high harmonic suppression |
| CN111129729A (en) * | 2019-12-11 | 2020-05-08 | 维沃移动通信有限公司 | Antenna unit and electronic equipment |
| CN111179450A (en) * | 2019-12-25 | 2020-05-19 | 北京万集科技股份有限公司 | Antenna, road side unit RSU |
| CN111293413A (en) * | 2020-03-03 | 2020-06-16 | 电子科技大学 | Compact broadband filtering antenna based on cross-coupling structure and MIMO antenna thereof |
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| CN111478000A (en) * | 2020-04-21 | 2020-07-31 | 南京智能高端装备产业研究院有限公司 | Multi-zero-point band-pass balance filter adopting double-layer circular patches |
| CN111478026A (en) * | 2020-04-20 | 2020-07-31 | 南通大学 | Strip type dielectric patch filter antenna array |
| CN111697330A (en) * | 2020-06-18 | 2020-09-22 | 中天宽带技术有限公司 | Filtering antenna |
| CN111740217A (en) * | 2020-07-03 | 2020-10-02 | 维沃移动通信有限公司 | Antenna assembly and electronic equipment |
| CN111883916A (en) * | 2020-07-16 | 2020-11-03 | 南通大学 | Broadband low-profile dielectric patch filtering antenna based on double-slit feed structure |
| CN111883917A (en) * | 2020-07-16 | 2020-11-03 | 南通大学 | Bandwidth reconfigurable dielectric patch filter antenna based on double-slit feed structure |
| CN112510339A (en) * | 2020-12-22 | 2021-03-16 | 华南理工大学 | High-selectivity gain dual-polarized filtering patch antenna |
| CN112582792A (en) * | 2020-12-04 | 2021-03-30 | 南通大学 | Frequency tunable microstrip patch antenna based on half-cut technology |
| CN112736423A (en) * | 2020-12-10 | 2021-04-30 | 重庆大学 | Compact low-profile differential filtering microstrip patch antenna |
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| CN111697330A (en) * | 2020-06-18 | 2020-09-22 | 中天宽带技术有限公司 | Filtering antenna |
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| CN111883916A (en) * | 2020-07-16 | 2020-11-03 | 南通大学 | Broadband low-profile dielectric patch filtering antenna based on double-slit feed structure |
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| CN111883917B (en) * | 2020-07-16 | 2022-08-12 | 南通大学 | Bandwidth reconfigurable dielectric patch filter antenna based on double-slit feed structure |
| CN111883916B (en) * | 2020-07-16 | 2022-10-18 | 南通大学 | Broadband low-profile dielectric patch filtering antenna based on double-slit feed structure |
| CN112582792A (en) * | 2020-12-04 | 2021-03-30 | 南通大学 | Frequency tunable microstrip patch antenna based on half-cut technology |
| CN112736423A (en) * | 2020-12-10 | 2021-04-30 | 重庆大学 | Compact low-profile differential filtering microstrip patch antenna |
| CN112510339A (en) * | 2020-12-22 | 2021-03-16 | 华南理工大学 | High-selectivity gain dual-polarized filtering patch antenna |
| CN112838360A (en) * | 2020-12-24 | 2021-05-25 | 浙江吉利控股集团有限公司 | Dual-polarized microstrip phased array antenna unit and array thereof |
| CN112838360B (en) * | 2020-12-24 | 2022-04-12 | 浙江吉利控股集团有限公司 | Dual-polarized microstrip phased array antenna unit and array thereof |
| WO2022226918A1 (en) * | 2021-04-29 | 2022-11-03 | 京东方科技集团股份有限公司 | Antenna and manufacturing method therefor, and antenna system |
| CN113871850B (en) * | 2021-08-19 | 2023-01-20 | 北京邮电大学 | Ridge gap waveguide feed microwave millimeter wave dual-frequency broadband super-surface antenna |
| CN113871850A (en) * | 2021-08-19 | 2021-12-31 | 北京邮电大学 | Ridge gap waveguide feed microwave millimeter wave dual-frequency broadband super-surface antenna |
| CN114050410A (en) * | 2021-12-30 | 2022-02-15 | 陕西海积信息科技有限公司 | Circularly polarized antenna and reference station |
| CN114566796A (en) * | 2022-03-11 | 2022-05-31 | 厦门大学 | Broadband high-gain circularly polarized filtering antenna |
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