CN104795639A - Compact circular polarization microstrip antenna and antenna array consisting of compact circular polarization microstrip antenna - Google Patents
Compact circular polarization microstrip antenna and antenna array consisting of compact circular polarization microstrip antenna Download PDFInfo
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- CN104795639A CN104795639A CN201510245290.0A CN201510245290A CN104795639A CN 104795639 A CN104795639 A CN 104795639A CN 201510245290 A CN201510245290 A CN 201510245290A CN 104795639 A CN104795639 A CN 104795639A
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Abstract
The invention discloses a compact circular polarization microstrip antenna and an antenna array consisting of the compact circular polarization microstrip antenna. Upper and lower medium plates and a base plate of the compact circular polarization microstrip antenna are in the shape of a same square; a square radiation adhesion piece is adhered to the upper surface of the upper medium plate; the base plate is adhered to the upper surface of the lower medium plate; a microstrip feeder line is adhered to the lower surface of the lower medium plate; an air layer is arranged between the base plate and the upper medium plate; a cross groove of which the longitudinal groove and the transverse groove are perpendicular to each other and are divided equally is formed in the center of the base plate; 3-7 grooves are formed in each of four sides of the radiation adhesion piece on the top layer; the groove in the central line is deepest; the depths of grooves in two sides are gradually reduced; the grooves in four sides are symmetrically formed by taking the radiation adhesion piece as the center. The compact circular polarization microstrip antenna is taken as an array element to form the antenna array; power dividers are connected with array element feeder lines, and a plurality of array elements are arranged in a straight line on one same plane or are arranged in a square on the same plane; the compact circular polarization microstrip antenna is relatively good in circular polarization property, the size of the antenna can be reduced, the distance between array elements of the antennas can be reduced to be 0.6lamda, and the antenna array is compact in structure.
Description
Technical field
The present invention relates to the reception antenna technical field in communication, be specially a kind of compact circularly-polarized microstrip antenna and antenna array thereof.
Background technology
Circular polarization microstrip antenna is a kind of subsides chip aerial be made up of the metal copper sheet be attached on medium, and circular polarization microstrip antenna comprises the radiation patch of top layer, air layer and bottom feeder line.Circular polarization microstrip antenna is mainly used in reception antenna, requires good circular polarization characteristics.The identical groove of the degree of depth of symmetric form is opened on four limits of current circular polarization microstrip antenna radiation patch, and to extend radiation patch surface current path, reduction antenna size, while making antenna array compact conformation, also ensures the circular polarization characteristics of antenna.But the existence of the line of rabbet joint symmetrically can affect the CURRENT DISTRIBUTION in paster, the circular polarization characteristics of infringement antenna.
Circular polarization microstrip antenna array is made up of several microstrip antenna element.Owing to there is coupling between bay, in order to reduce the impact be coupled on each bay performance, at present, the array element distance of general microstrip antenna array is 0.5 λ (λ is electromagnetic wave wavelength in media as well), micro-band circular polarization antenna array disturbs because of its circular polarization and causes array element distance all larger, be at least 0.83 λ, be unfavorable for the miniaturization of antenna array.
Summary of the invention
The object of the invention is to design a kind of compact circularly-polarized microstrip antenna, the groove on its Shang Mei limit, radiation patch four limit center line is the darkest, and the depth of groove of both sides reduces gradually, the groove on each limit with each limit center line for symmetry.Reduce antenna volume, antenna structure is compact, and quality is little.
Another object of the present invention is the antenna array that a kind of compact circularly-polarized microstrip antenna of design is formed, and with the compact circularly-polarized microstrip antenna of the present invention for array element, the mutual spacing of array element is reduced into 0.6 λ or less, is beneficial to the miniaturization of antenna array.
A kind of compact circularly-polarized microstrip antenna of the present invention's design comprises the microstrip feed line of top layer radiation patch, top dielectric plate, substrate, layer dielectric plate and the bottom stacked successively, top dielectric plate, substrate and layer dielectric plate are identical square, its length of side is S, radiation patch is also square, its length of side is s, S=(1.5 ~ 2.5) s.Radiation patch is attached at top dielectric plate upper surface, and substrate is attached at layer dielectric plate upper surface, and microstrip feed line is attached at the lower surface of layer dielectric plate, and substrate and radiation patch are copper sheet.Top dielectric plate and layer dielectric plate are insulation medium board.Be air layer between upper surface of base plate and top dielectric plate lower surface.The center of top layer radiation patch, top dielectric plate, substrate and layer dielectric plate is on same plumb line, and the centerline on each limit is on same vertical guide.There is cross recess at the center of substrate, and cross recessed pod and translot are mutually vertical to be divided equally, and is parallel to the adjacent both sides of substrate respectively.There are 3 ~ 7 rectangular recess on the Shang Mei limit, radiation patch four limit of top layer, and groove center line is vertical with the limit at place, and be in groove on the center line of each limit the darkest, the depth of groove of center line both sides, each limit reduces gradually, the groove on each limit with each limit center line for symmetry.The width W of each groove is identical, is greater than W, W '=(1.8 ~ 2.2) W outside the spacing on each groove limit and two ends, each limit groove with the spacing W ' on radiation patch limit.The width W of each groove is 0.1mm ~ 0.3mm, and the depth of groove on the center line of each limit is L, L=(0.25 ~ 0.35) s, and the degree of depth geometric ratio of each limit center line grooves on two sides reduces.Groove on four limits with radiation patch center for symmetry.
Substrate and radiation patch are the copper sheet of thickness 0.02mm ~ 0.08mm.
Top dielectric plate and layer dielectric plate are the insulation medium board of thickness 0.5mm ~ 2mm.
Between upper surface of base plate and top dielectric plate lower surface, the thickness of air layer is 3mm ~ 6mm.
Cross recessed groove width Ws is less than the width W of radiation patch each limit groove, W=(1.1 ~ 1.5) Ws.
Cross recessed length Ls equals radiation patch length of side s.
The antenna array of a kind of compact circularly-polarized microstrip antenna formation of the present invention's design, multiple identical above-mentioned compact circularly-polarized microstrip antenna is that array element forms antenna array, the isodisperse of power splitter is identical with array number, the each port of power splitter is connected one by one with the feeder line of each array element in antenna array, the signal of input constant amplitude homophase, the wavelength of radio wave in the substrate media of array element of the spacing of array element to be 0.5 ~ 0.6 λ, λ be this antenna array work; 2 ~ 7 array element at grade line that is aligned, array element center is a straight line, or N × N number of array element is arranged as quadrate array at grade, and N is the integer of 2 to 8.
Compared with prior art, the advantage of the antenna array of a kind of compact circularly-polarized microstrip antenna of the present invention and formation thereof is: 1, the groove of radiant body paster each limit gradual change, extend chip surface current path, make radiation patch have circular polarization characteristics more better than the groove of same depth simultaneously, make circular polarization microstrip antenna array compact conformation, ensure the circular polarization characteristics of narrow beam and antenna simultaneously, greatly reduce antenna size, be 45mm × 45mm by the microstrip antenna radiant body patch size of routine, be kept to 30mm × 30mm, reduction 30%; 2, the cross recess on antenna substrate reduces the coupling of feeder line, and the spacing of reduction array element, by micro-band circular polarization antenna array array element distance 0.83 λ of routine, is kept to and is equal to or less than 0.6 λ, reduction 25%; Thus under the guarantee circular polarization characteristics of micro-band circular polarization antenna array and the prerequisite of radiation characteristic, reduce the size of micro-band circular polarization antenna array.
Accompanying drawing explanation
Fig. 1 is this compact circularly-polarized microstrip antenna embodiment schematic top plan view;
Fig. 2 is this compact circularly-polarized microstrip antenna embodiment schematic side view;
Fig. 3 is this compact circularly-polarized microstrip antenna embodiment elevational schematic view;
Fig. 4 is antenna array embodiment 1 structural representation that this compact circularly-polarized microstrip antenna is formed;
Fig. 5 is antenna array embodiment 2 structural representation that this compact circularly-polarized microstrip antenna is formed.Number in the figure is:
1, top dielectric plate, 2, radiation patch, 3, air layer, 4, substrate, 5, layer dielectric plate, 6, microstrip feed line, 7, cross recess.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
Compact circularly-polarized microstrip antenna embodiment
This compact circularly-polarized microstrip antenna embodiment as shown in Figures 1 to 3, comprise the microstrip feed line 6 of the radiation patch 2 of the top layer stacked successively, top dielectric plate 1, substrate 4, layer dielectric plate 5 and bottom, top dielectric plate 1, substrate 4 are identical square with layer dielectric plate 5, its length of side is S, this routine S=60mm.Radiation patch 2 is also square, and its length of side is s, s=30mm.Top dielectric plate 1 is single-side coated copper plate, the Copper Foil etching of the thickness 0.05mm that its upper surface attaches is radiation patch 2, layer dielectric plate 5 is double face copper, the Copper Foil of the thickness 0.05mm that its upper surface attaches is substrate 4, its center is etched with cross recess 7, the pod of cross recess 7 is divided equally with translot is mutually vertical, and is parallel to the adjacent both sides of substrate 4 respectively.The groove width Ws of cross recess 7 is less than the width W of radiation patch 2 each limit groove, this routine W=1.3Ws, and the length Ls of cross recess 7 equals radiation patch 2 length of side s.The Copper Foil etching of the thickness 0.05mm that layer dielectric plate 5 lower surface attaches is microstrip feed line 6.Top dielectric plate 1 and layer dielectric plate 5 are the insulation medium board of thickness d 1=d2=5mm.It is the air layer 3 of thickness d 2=4.5mm between substrate 4 upper surface and top dielectric plate 1 lower surface.The center of top layer radiation patch 2, top dielectric plate 1, substrate 4 and layer dielectric plate 5 is on same plumb line, and the centerline on each limit of each layer is on same vertical guide.
There are 5 rectangular recess on the Shang Mei limit, radiation patch 2 four limit of top layer, and groove center line is vertical with the limit at place, and be in groove on the center line of each limit the darkest, the depth of groove of center line both sides, each limit reduces gradually, the groove on each limit with each limit center line for symmetry.The width W of each groove is identical, and the spacing of each groove and the spacing W ' of two ends, each limit groove outer side edges and the same side of radiation patch 2 are greater than W, this routine W '=2W.The width W of each groove is 0.2mm, and the depth of groove on the center line of each limit is L1, L1=10mm, and the degree of depth of center line grooves on two sides is kept to L2=7mm, L3=2mm successively.Groove on four limits with radiation patch center for symmetry.
The antenna array embodiment 1 that compact circularly-polarized microstrip antenna is formed
The antenna array embodiment 1 that this compact circularly-polarized microstrip antenna is formed as shown in Figure 4,3 above-mentioned compact circularly-polarized microstrip antenna embodiments are that array element forms collinear array, 3 identical power splitters are connected one by one with the feeder line of 3 array elements, the signal of input constant amplitude homophase, 3 array elements are aligned at grade, and the line at 3 array element centers is a straight line.
This routine micro-band circular polarization antenna array operating frequency is 2.4GHz, and the wavelength X in substrate media is 59.55mm, and the space D (spacing of namely adjacent radiation patch) of micro-band circular polarization antenna array array element is 35mm, D=0.6 λ.
This routine micro-band circular polarization antenna array return loss bandwidth is 200MH
z, be 2.3GHz ~ 2.5GHz, antenna circular polarization radiation, axial ratio bandwidth is 70MH
z, be 2.35GHz ~ 2.42GHz, beam angle 31.5 °.
The antenna array embodiment 2 that compact circularly-polarized microstrip antenna is formed
The antenna array embodiment 2 that this compact circularly-polarized microstrip antenna is formed as shown in Figure 5,2 × 2 above-mentioned compact circularly-polarized microstrip antenna embodiments are that array element forms quadrate array antenna array, 4 identical power splitters are connected one by one with the feeder line of 4 array elements, the signal of input constant amplitude homophase, 4 array element is arranged in the quadrate array of 2 × 2 at same plane.
This routine micro-band circular polarization antenna array operating frequency is 2.4GHz, and the wavelength X in substrate media is 59.55mm, and the space D of array element is 35mm, D=0.6 λ.
Above-described embodiment, be only the specific case further described object of the present invention, technical scheme and beneficial effect, the present invention is not defined in this.All make within scope of disclosure of the present invention any amendment, equivalent replacement, improvement etc., be all included within protection scope of the present invention.
Claims (10)
1. a compact circularly-polarized microstrip antenna, comprise the microstrip feed line (6) of the radiation patch (2) of the top layer stacked successively, top dielectric plate (1), substrate (4), layer dielectric plate (5) and bottom, top dielectric plate (1), substrate (4) and layer dielectric plate (5) are identical square, its length of side is S, radiation patch (2) is also square, its length of side is s, S=(1.5 ~ 2.5) s; Radiation patch (2) is attached at top dielectric plate (1) upper surface, substrate (4) is attached at layer dielectric plate (5) upper surface, microstrip feed line (6) is attached at the lower surface of layer dielectric plate (5), and substrate (4) and radiation patch (2) are copper sheet; Top dielectric plate (1) and layer dielectric plate (4) are insulation medium board; Be air layer (3) between substrate (4) upper surface and top dielectric plate (1) lower surface; The center of radiation patch (2), top dielectric plate (1), substrate (4) and layer dielectric plate (5) is on same plumb line, and the centerline on each limit is on same vertical guide; It is characterized in that:
There is cross recess (7) at the center of described substrate (4), and the pod of cross recess (7) is divided equally with translot is mutually vertical, and is parallel to the adjacent both sides of substrate (4) respectively; There are 3 ~ 7 rectangular recess on Shang Mei limit, described radiation patch (2) four limit, groove center line is vertical with the limit of place radiation patch (2), the groove be on the center line of each limit is the darkest, the depth of groove of center line both sides, each limit reduces gradually, groove on each limit is with each limit center line for symmetry, and the groove on four limits is symmetrical with radiation patch (2) center.
2. compact circularly-polarized microstrip antenna according to claim 1, is characterized in that:
On described radiation patch (2) four limit, the width W of each groove is identical, is greater than W, W '=(1.8 ~ 2.2) W outside the spacing on each groove limit and two ends, each limit groove with the spacing W ' on radiation patch (2) limit.
3. compact circularly-polarized microstrip antenna according to claim 2, is characterized in that:
On described radiation patch (2) four limit, the width W of each groove is 0.1mm ~ 0.3mm.
4. compact circularly-polarized microstrip antenna according to claim 1, is characterized in that:
Depth of groove on the center line of Shang Ge limit, described radiation patch (2) four limit is L, L=(0.25 ~ 0.35) s, and the degree of depth geometric ratio of each limit center line grooves on two sides reduces.
5. compact circularly-polarized microstrip antenna according to claim 1, is characterized in that:
The copper sheet that described substrate (4) and radiation patch (2) are thickness 0.02mm ~ 0.08mm.
6. compact circularly-polarized microstrip antenna according to claim 1, is characterized in that:
The insulation medium board that described top dielectric plate (1) and layer dielectric plate (5) are thickness 0.5mm ~ 2mm.
7. compact circularly-polarized microstrip antenna according to claim 1, is characterized in that:
Between described substrate (4) upper surface and top dielectric plate (5) lower surface, the thickness of air layer (3) is 3mm ~ 6mm.
8. compact circularly-polarized microstrip antenna according to claim 2, is characterized in that:
The groove width Ws of the cross recess (7) on described substrate (4) is less than the width W of radiation patch (2) each limit groove, W=(1.1 ~ 1.5) Ws.
9. compact circularly-polarized microstrip antenna according to claim 1, is characterized in that:
The length Ls of the upper cross recess (7) of described substrate (4) equals radiation patch (2) length of side s.
10. the antenna array of compact circularly-polarized microstrip antenna formation according to any one of claim 1 to 9, is characterized in that:
Multiple identical above-mentioned compact circularly-polarized microstrip antenna is that array element forms antenna array, be connected one by one with the feeder line of each array element in antenna array with the identical power splitter of array element equal number, the signal of input constant amplitude homophase, the wavelength of radio wave in the substrate media of array element of the spacing of array element to be 0.5 ~ 0.6 λ, λ be this antenna array work; 2 ~ 7 array element at grade aligned, array element center line in line, or N × N number of array element is arranged as quadrate array at grade, and N is the integer of 2 to 8.
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| CN201510245290.0A CN104795639B (en) | 2015-05-14 | 2015-05-14 | A kind of antenna array of compact circularly-polarized microstrip antenna and its composition |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106252902A (en) * | 2016-09-28 | 2016-12-21 | 广东工业大学 | A kind of Compact type broadband end-fired array array antenna |
| CN106450674A (en) * | 2016-08-24 | 2017-02-22 | 重庆大学 | Antenna array, communication device and terminal equipment |
| CN106532248A (en) * | 2016-12-09 | 2017-03-22 | 桂林电子科技大学 | Ultra-compacted microstrip patch array antenna |
| CN107978868A (en) * | 2017-12-14 | 2018-05-01 | 南京航空航天大学 | A kind of super-broadband graded gap circular polarization microstrip antenna |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06252629A (en) * | 1993-02-23 | 1994-09-09 | Sony Corp | Planar antenna |
| JP3239435B2 (en) * | 1992-04-24 | 2001-12-17 | ソニー株式会社 | Planar antenna |
| CN1340223A (en) * | 1999-12-10 | 2002-03-13 | 三菱电机株式会社 | Generator of circularly polarized wave |
| CN102956966A (en) * | 2011-08-12 | 2013-03-06 | 卡西欧计算机株式会社 | Patch antenna device and radio wave receiver |
| CN103280624A (en) * | 2013-04-09 | 2013-09-04 | 广东工业大学 | Patch antenna |
| CN203942006U (en) * | 2014-05-12 | 2014-11-12 | 成都振芯科技股份有限公司 | A kind of fluting is realized the circularly polarization microstrip patch antenna of miniaturization |
| CN204577600U (en) * | 2015-05-14 | 2015-08-19 | 桂林电子科技大学 | The antenna array of a kind of compact circularly-polarized microstrip antenna and formation thereof |
-
2015
- 2015-05-14 CN CN201510245290.0A patent/CN104795639B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3239435B2 (en) * | 1992-04-24 | 2001-12-17 | ソニー株式会社 | Planar antenna |
| JPH06252629A (en) * | 1993-02-23 | 1994-09-09 | Sony Corp | Planar antenna |
| CN1340223A (en) * | 1999-12-10 | 2002-03-13 | 三菱电机株式会社 | Generator of circularly polarized wave |
| CN102956966A (en) * | 2011-08-12 | 2013-03-06 | 卡西欧计算机株式会社 | Patch antenna device and radio wave receiver |
| CN103280624A (en) * | 2013-04-09 | 2013-09-04 | 广东工业大学 | Patch antenna |
| CN203942006U (en) * | 2014-05-12 | 2014-11-12 | 成都振芯科技股份有限公司 | A kind of fluting is realized the circularly polarization microstrip patch antenna of miniaturization |
| CN204577600U (en) * | 2015-05-14 | 2015-08-19 | 桂林电子科技大学 | The antenna array of a kind of compact circularly-polarized microstrip antenna and formation thereof |
Non-Patent Citations (1)
| Title |
|---|
| 李中明等: "圆极化微带天线的小型化", 《桂林电子科技大学学报》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106450674A (en) * | 2016-08-24 | 2017-02-22 | 重庆大学 | Antenna array, communication device and terminal equipment |
| CN106252902A (en) * | 2016-09-28 | 2016-12-21 | 广东工业大学 | A kind of Compact type broadband end-fired array array antenna |
| CN106252902B (en) * | 2016-09-28 | 2023-03-24 | 广东工业大学 | Compact broadband end-fire array antenna |
| CN106532248A (en) * | 2016-12-09 | 2017-03-22 | 桂林电子科技大学 | Ultra-compacted microstrip patch array antenna |
| CN107978868A (en) * | 2017-12-14 | 2018-05-01 | 南京航空航天大学 | A kind of super-broadband graded gap circular polarization microstrip antenna |
| CN107978868B (en) * | 2017-12-14 | 2023-12-01 | 南京航空航天大学 | Ultra-wideband gradual change gap circularly polarized microstrip antenna |
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