CN109786985A - A kind of Rectangular Microstrip Standing-wave Antennas antenna based on coplanar waveguide ground - Google Patents
A kind of Rectangular Microstrip Standing-wave Antennas antenna based on coplanar waveguide ground Download PDFInfo
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- CN109786985A CN109786985A CN201811518926.4A CN201811518926A CN109786985A CN 109786985 A CN109786985 A CN 109786985A CN 201811518926 A CN201811518926 A CN 201811518926A CN 109786985 A CN109786985 A CN 109786985A
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Abstract
The invention discloses a kind of Rectangular Microstrip Standing-wave Antennas antenna based on coplanar waveguide ground, including transmitting antenna, the transmitting antenna includes first medium substrate (1), the first metal floor (2), the first metal patch and the first short-circuit part (6b)；It further include receiving antenna, the receiving antenna includes second medium substrate (7), the second metal floor (8), the second metal patch, the second short-circuit part (12b), pad (11) and coaxial feed port (13).Rectangular Microstrip Standing-wave Antennas antenna based on coplanar waveguide ground of the invention has the characteristics that high gain, directional diagram are stable, section is low, light-weight and the processing is simple.
Description
Technical field
The invention belongs to field of microwave communication, and in particular to a kind of Rectangular Microstrip Standing-wave Antennas day based on coplanar waveguide ground
Line.
Background technique
Microstrip antenna is since at low cost, light-weight, low section, that small in size, electrical property is diversified, production is simple etc. is excellent
Point, is widely used.The feeding network that micro-strip linear array is often constituted with microstrip line feeds each radiating element, not only
Antenna gain can be improved, and can realize that specific current distribution to expire on array by beamforming technique
The antenna radiation pattern of prestige improves the directionality of antenna.But the increase of array element can not make its gain increase corresponding multiple, there is one
Partially due to the lengthening of feeder line and cause to be lost.Series feed array is since feeding network is simple, compact, so loss is smaller, uses
Series feed battle array can also easily and effectively form face battle array.
When selecting optimal PCB material for a certain circuit design, high-frequency circuit designer need to usually consider the performance of circuit
Variation, physical size and power height.The selection of different transmission line technologies will affect the final performance of circuit design, such as using micro-
Band line or coplanar waveguide ground (GCPW).Small spacing in coplanar waveguide ground, between top layer ground conductor and signal conductor
The Low ESR of circuit may be implemented, and can change the impedance of circuit by adjusting the spacing.Earth conductor and signal conductor
Spacing increases, and impedance also will increase.When the spacing of the top layer ground conductor of coplanar waveguide ground and signal conductor increases, ground connection
Influence of the conductor to circuit can reduce.When spacing is sufficiently large, coplanar waveguide ground circuit is similar to microstrip circuitry.To the greatest extent
Pipe microstrip line has high radiation loss and be difficult to realize high-order mode in high-frequency band and millimeter wave frequency band to be inhibited, and microstrip line can still fit
For the relatively narrow circuit of microwave frequency band bandwidth.And microstrip circuitry is to PCB processing technology and copper layer thickness and difference in thickness
It is less sensitive.Unlike this, coplanar waveguide ground has relatively low radiation loss in millimeter wave frequency band and is able to achieve good
High-order mode inhibits, this becomes coplanar waveguide ground suitable for high frequency candidate transport line technology.In addition, coplanar waveguide ground is electric
Road is not relatively very harsh to PCB processing technology and deviation requirement, this makes coplanar waveguide ground be suitable for the amount of high-frequency band
It produces and applies.
Summary of the invention
The object of the invention is that it is micro- to provide a kind of rectangle based on coplanar waveguide ground to solve the above-mentioned problems
Band series fed antenna, by adding coplanar waveguide ground in series fed antenna battle array, so that antenna has stable grounding characteristics, thus real
Existing Low emissivity loss and good high-order mode inhibit.
The present invention through the following technical solutions to achieve the above objectives:
A kind of Rectangular Microstrip Standing-wave Antennas antenna based on coplanar waveguide ground, including transmitting antenna, the transmitting antenna include
First medium substrate, the first metal floor, the first metal patch and the first short-circuit part；
First metal patch and the first metal floor are separately positioned on two surfaces of the first medium substrate；
First metal patch includes the first ground connection patch of the transmission line of wave port, the first patch array, co-planar waveguide
First center signal line of piece and co-planar waveguide；
First patch array includes several first rectangular patches of series feed；
The transmission line connects one end of first patch array；
It is connected between adjacent first rectangular patch by the first center signal line；
The two sides of the first center signal line are provided with first ground patch；
First short-circuit part penetrates the first medium substrate and connects first ground patch and the first metal
Floor.
Further, further include receiving antenna, the receiving antenna include second medium substrate, the second metal floor,
Second metal patch, the second short-circuit part, pad and coaxial feed port；
Second metal patch and the second metal floor are separately positioned on two surfaces of the second medium substrate；
Second metal patch includes the of the second patch array, the second ground patch of co-planar waveguide and co-planar waveguide
Two center signal lines；
Second patch array includes several second rectangular patches of series feed；
The pad connects one end of second patch array；
It is connected between adjacent second rectangular patch by the second center signal line；
The two sides of the second center signal line are provided with second ground patch；
Second short-circuit part penetrates the dielectric substrate and connects second ground patch and the second metal floor；
The coaxial feed port penetrates the dielectric substrate and connects the pad.
Wherein, receiving antenna is inputted by coaxial feed port signal.
Further, the width of first rectangular patch is all the same, the length ratio of adjacent first rectangular patch
For fixed value, from the first rectangular patch length described in the connecting pin to the other end of first patch array and the transmission line by
It is decrescence few.
Further, the width of second rectangular patch is all the same, the length ratio of adjacent second rectangular patch
For fixed value, the first rectangular patch length described in the connecting pin to the other end from second patch array with the pad is gradually
It reduces.
Further, the length and width of the first center signal line between adjacent first rectangular patch is equal
It is identical.
Further, the length and width of the second center signal line between adjacent second rectangular patch is equal
It is identical.
Further, further include the first impedance transformation line, the first impedance transformation line setting in the transmission line and
Between first patch array.
It further, further include the second impedance transformation line, the second impedance transformation line setting is in the pad and the
Between two patch arrays.
Wherein, the present invention in transmitting antenna the second patch array the first rectangular patch one be divided into four groups be connected,
In most intermediate one group in addition to there are also one section of impedance transformation lines for one section of micro-strip connecting line.
Wherein, the present invention in receiving antenna the second patch array the second rectangular patch one be divided into four groups be connected,
In most intermediate one group in addition to there are also one section of second impedance transformation lines for one section of micro-strip connecting line.
Further, the quantity of first patch array and the second patch array is two.Wherein, described in two
First patch array is in 180 ° of angles.Two second patch arrays are in 180 ° of angles.
Further, each first ground patch is all connected with there are two first short-circuit part, each described
Second ground patch is all connected with there are two second short-circuit part.Wherein, in the present invention co-planar waveguide of transmitting antenna the
One ground patch shares 12, and the first short-circuit part is first ground patch of one group of asymmetrical load in co-planar waveguide with two
On.Wherein, the first ground patch is rectangle.To realize that relatively low radiation loss and good high-order mode inhibit.
Second ground patch of the co-planar waveguide of receiving antenna shares 12, and short-circuit part is with two for one group of asymmetrical load
On the second ground patch of co-planar waveguide.Wherein, the second ground patch is rectangle.To realize relatively low radiation loss
Inhibit with good high-order mode.
The utility model has the advantages that the Rectangular Microstrip Standing-wave Antennas antenna of the invention based on coplanar waveguide ground, has section low, at low cost
The simple feature with production, and there is firm ground structure, relatively low radiation loss and good high-order mode inhibit.
Detailed description of the invention
Fig. 1 is the perspective view of the Rectangular Microstrip Standing-wave Antennas transmitting antenna the present invention is based on coplanar waveguide ground；
Fig. 2 is the top view of the Rectangular Microstrip Standing-wave Antennas transmitting antenna the present invention is based on coplanar waveguide ground；
Fig. 3 is the perspective view of the Rectangular Microstrip Standing-wave Antennas receiving antenna the present invention is based on coplanar waveguide ground；
Fig. 4 is the top view of the Rectangular Microstrip Standing-wave Antennas receiving antenna the present invention is based on coplanar waveguide ground；
Fig. 5 is the side view the present invention is based on the Rectangular Microstrip Standing-wave Antennas receiving antenna of coplanar waveguide ground along A-A ' section；
Fig. 6 is the input terminal reflection coefficient of the Rectangular Microstrip Standing-wave Antennas transmitting antenna the present invention is based on coplanar waveguide ground；
Fig. 7 is the antenna pattern of the Rectangular Microstrip Standing-wave Antennas transmitting antenna the present invention is based on coplanar waveguide ground；
Fig. 8 is the input terminal reflection coefficient of the Rectangular Microstrip Standing-wave Antennas receiving antenna the present invention is based on coplanar waveguide ground；
Fig. 9 is the antenna pattern of the Rectangular Microstrip Standing-wave Antennas receiving antenna the present invention is based on coplanar waveguide ground.
Specific embodiment
Technical scheme is described further with reference to the accompanying drawing:
It please refers to shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the Rectangular Microstrip Standing-wave Antennas of the invention based on coplanar waveguide ground
Antenna, including transmitting antenna, transmitting antenna include first medium substrate 1, the first metal floor 2, the first metal patch and first
Short-circuit part 6b；First metal patch and the first metal floor 2 are separately positioned on two surfaces of first medium substrate 1；First
Metal patch includes the first ground patch 6a and co-planar waveguide of the transmission line 3 of wave port, the first patch array, co-planar waveguide
First center signal line 6c；First patch array includes several first the rectangular patch 4a, 4b, 4c, 4d of series feed；Transmission line
One end of 3 the first patch arrays of connection；Connected between adjacent first rectangular patch 4a, 4b, 4c, 4d by the first center signal line 6c
It connects；The two sides of first center signal line 6c are provided with the first ground patch 6a；First short-circuit part 6b penetrates first medium base
Piece 1 simultaneously connects the first ground patch 6a and the first metal floor 2.
Preferably, the width of the first rectangular patch 4a, 4b, 4c, 4d is all the same, adjacent first rectangular patch 4a, 4b, 4c,
The length ratio of 4d is fixed value, from the connecting pin of the first patch array and transmission line 3 to the other end the first rectangular patch 4a, 4b,
4c, 4d length gradually decrease.
Preferably, the length and width of the first center signal line 6c between adjacent first rectangular patch 4a, 4b, 4c, 4d
It is all the same.
It preferably, further include the first impedance transformation line 5a, the first impedance transformation line 5a setting in transmission line 3 and the first patch
Between array.
Preferably, each first ground patch 6a is all connected with there are two the first short-circuit part 6b.Wherein, emit in the present invention
First ground patch 6a of the co-planar waveguide of antenna shares 12, and the first short-circuit part 6b is one group of asymmetrical load altogether with two
On the first ground patch 6a that surface wave is led.Wherein, the first ground patch 6a is rectangle.
It preferably, further include receiving antenna, receiving antenna includes second medium substrate 7, the second metal floor 8, the second gold medal
Belong to patch, the second short-circuit part 12b, pad 11 and coaxial feed port 13；Second metal patch and the second metal floor 8 difference
Two surfaces of second medium substrate 7 are set；Second metal patch includes the second ground connection of the second patch array, co-planar waveguide
The second center signal line 12c of patch 12a and co-planar waveguide；Second patch array includes several second rectangles patch of series feed
Piece 9a, 9b, 9c, 9d；Pad 11 connects one end of the second patch array；Lead between adjacent second rectangular patch 9a, 9b, 9c, 9d
Cross the second center signal line 12c connection；The two sides of second center signal line 12c are provided with the second ground patch 12a；Second is short
Circuit unit 12b penetrates dielectric substrate 7 and connects the second ground patch 12a and the second metal floor 8；Coaxial feed port 13 penetrates
Dielectric substrate 7 simultaneously connects pad 11.
Wherein, receiving antenna is inputted by 13 signal of coaxial feed port.
Preferably, the width of the second rectangular patch 9a, 9b, 9c, 9d is all the same, adjacent second rectangular patch 9a, 9b, 9c,
The length ratio of 9d is fixed value, from the connecting pin of the second patch array and pad 11 to the other end the first rectangular patch 4a, 4b,
4c, 4d length gradually decrease.
Preferably, the length and width of the second center signal line 12c between adjacent second rectangular patch 9a, 9b, 9c, 9d
It is all the same.
It preferably, further include that the second impedance transformation line 10a, the second impedance transformation line 10a setting is pasted in pad 11 and second
Between chip arrays.
Wherein, the second rectangular patch one of the second patch array of receiving antenna is divided into four groups of 9a, 9b in the present invention,
9c, 9d are connected, wherein one group of most intermediate 9d is connected in addition to one section of micro-strip by the second center signal line 12c of co-planar waveguide
There are also one section of second impedance transformation line 10a for line.
Preferably, the quantity of the first patch array and the second patch array is two.Wherein, two first patches
Array is in 180 ° of angles.Two second patch arrays are in 180 ° of angles.
Preferably, each second ground patch 12a is all connected with there are two the second short-circuit part 12b.Receiving antenna it is coplanar
Second ground patch 12a of waveguide shares 12, and short-circuit part 12b is one group of asymmetrical load the second of co-planar waveguide with two
On ground patch 12a.Wherein, the second ground patch 12a is rectangle.
Rectangular Microstrip Standing-wave Antennas antenna based on coplanar waveguide ground of the invention, and production letter low, at low cost with section
Single feature, and there is firm ground structure, relatively low radiation loss and good high-order mode inhibit.
Embodiment 1
Please refer to attached drawing 1 and Fig. 2, the Rectangular Microstrip Standing-wave Antennas antenna of the invention based on coplanar waveguide ground,
Wherein, transmitting antenna includes dielectric substrate 1 of the thickness much smaller than the wavelength of working frequency points；Positioned at dielectric substrate
First metal patch on 1 one surfaces, the first metal patch include the transmission line 3 of wave port, the first square of series feed transmitting antenna
Shape patch 4a, 4b, 4c, 4d, the first impedance transformation line 5a, the first square of the first ground patch 6a and connection of the rectangle of co-planar waveguide
First center signal line 6c of the co-planar waveguide of shape patch 4a, 4b, 4c, 4d；The first gold medal positioned at 1 another surface of dielectric substrate
Possession plate 2；Several the first short-circuit parts 6b for penetrating dielectric substrate 1, by the of the rectangle of the co-planar waveguide in metal patch
One ground patch 6a and the first metal floor 2 connect.
Preferably, in the present embodiment, the tie point of the transmission line 3 and transmitting antenna of wave port is located at the first impedance transformation
The side of line 5a, to guarantee that antenna array is distributed with required amplitude-phase.
First rectangular patch one is divided into four groups of 4a, 4b, 4c, 4d, because radiation element position is relatively fixed, can only pass through cone
Current amplitude is cut to realize amplitude weighting, so the width of four group of first rectangular patch is the same, length is passed according to certain ratio column
Increase, and the length of the micro-strip connecting line between each first rectangular patch is identical.The first of the rectangle of co-planar waveguide connects
Ground patch 6a shares 12, and the first short-circuit part 6b is pasted with two the first ground connection for one group of asymmetrical load in co-planar waveguide rectangle
On piece 6a, to realize that relatively low radiation loss and good high-order mode inhibit.
Attached drawing 4, Fig. 5 and Fig. 6 are please referred to, receiving antenna includes second Jie of the thickness much smaller than the wavelength of working frequency points
Matter substrate 7；The second metal patch positioned at 7 one surfaces of second medium substrate, the second metal patch include the second series feed square
Shape patch 9a, 9b, 9c, 9d, the second impedance transformation line 10a, the of the rectangle of the pad 11 and co-planar waveguide of coaxial feed port
Two ground patch 12a connect the second center signal line 12c of the co-planar waveguide of adjacent second rectangular patch 9a, 9b, 9c, 9d；Position
The second metal floor 8 in 7 another surface of second medium substrate；Penetrate several second short of second medium substrate 7
Part 12b connects the second ground patch 12a of the rectangle of the co-planar waveguide of the second metal patch and the second metal floor 8；
It penetrates coaxial feed port 13 that second medium substrate 7 is connected with pad 11 as a further optimization solution of the present invention, connects
The second rectangular patch one for receiving antenna is divided into four groups of 9a, 9b, 9c, 9d, by the coplanar wave for connecting adjacent second rectangular patch
The the second center signal line 12c led is connected.Wherein, one group of most intermediate 9d is in addition to there are also one section of second resistances for one section of micro-strip connecting line
Resistance thread-changing 10a.Preferably, in the present embodiment, the width of four group of second rectangular patch of transmitting antenna is the same, length according to
Certain ratio column are incremented by, the length and width of the second center signal line 12c of the co-planar waveguide among every group of second rectangular patch
It is the same, to guarantee to realize amplitude weighting by taper current amplitude in the case where radiation element position is relatively fixed.
Second ground patch 12a of the rectangle of the co-planar waveguide of receiving antenna shares 12, the second letter of the co-planar waveguide of transmitting antenna
Number conductor lines 12c shares 12, and the second short-circuit part 12b is connect for one group of asymmetrical load the second of co-planar waveguide rectangle with two
On ground patch 12a, to realize that relatively low radiation loss and good high-order mode inhibit.Receiving antenna is to pass through coaxial feed
Port 13 carries out signal input, and the pad 11 of the coaxial feed port of receiving antenna is located at the one of series fed antenna impedance transformation line
Side, to guarantee that antenna array is distributed with required amplitude-phase.
The excitation of microstrip antenna array element will consider the radiant power and realizability of unit, in computing unit radiant power
When the reflection that each unit ties must be taken into consideration, the radiant power on each unit can be distributed by amplitude taper to be calculated, in order to drop
Low antenna side lobe, the width of rectangular element meets Taylor's Weighting Matrices, then optimizes transmission line by the methods of MOM and FEM
Length carries out phase compensation, makes antenna in resonance in the same direction, can design the Sidelobe for meeting requirement of engineering, high-gain, narrow
The microstrip antenna of wave beam.The closer spacing distance of coplanar waveguide ground is easily formed close coupling, obtains preferable parasitic mode and inhibits
Ability, and radiation loss is relatively low.Increase the spacing between signal wire and ground or increases the low conductor losses of signal line width and insert
Loss can be effectively reduced by entering loss.
It is attached it is shown in fig. 6 be transmitting antenna reflection coefficient varying with frequency, it is found that antenna is in 24G frequency range
With good, reflection coefficient is less than -10dB.It should be noted that the antenna is not limited to work in above-mentioned frequency range, it as needed, can
To allow Antenna Operation in other frequency ranges by adjusting patch and microstrip transmission line.
It is attached it is shown in Fig. 7 be transmitting antenna in the azimuth plane at 24G frequency range center and the directional diagram in pitching face, antenna is in orientation
Face is designed as broad beam, is designed as narrow beam in pitching face.And Sidelobe synthesis, tool are carried out to directional diagram using Taylor algorithm
There is the minor lobe better than -17dB to inhibit ratio.
It is attached it is shown in Fig. 8 be to receive reflection coefficient varying with frequency, it is found that antenna matches good in 24G frequency range
Good, reflection coefficient is less than -10dB.It should be noted that the antenna is not limited to work in above-mentioned frequency range, as needed, Ke Yitong
Patch and microstrip transmission line are overregulated, allows Antenna Operation in other frequency ranges.
It is attached it is shown in Fig. 9 be receiving antenna in the azimuth plane at 24G frequency range center and the directional diagram in pitching face, antenna is in orientation
Face is designed as broad beam, is designed as narrow beam in pitching face.And Sidelobe synthesis, tool are carried out to directional diagram using Taylor algorithm
There is the minor lobe better than -21dB to inhibit ratio.
The above, the only specific embodiment in the present invention, but scope of protection of the present invention is not limited thereto, appoints
What is familiar with the people of the technology within the technical scope disclosed by the invention, it will be appreciated that expects transforms or replaces, and should all cover
Within scope of the invention, therefore, the scope of protection of the invention shall be subject to the scope of protection specified in the patent claim.
Claims (10)
1. a kind of Rectangular Microstrip Standing-wave Antennas antenna based on coplanar waveguide ground, which is characterized in that including transmitting antenna, the transmitting
Antenna includes first medium substrate (1), the first metal floor (2), the first metal patch and the first short-circuit part (6b)；
First metal patch and the first metal floor (2) are separately positioned on two surfaces of the first medium substrate (1)；
First metal patch includes the first ground patch of the transmission line (3) of wave port, the first patch array, co-planar waveguide
First center signal line (6c) of (6a) and co-planar waveguide；
First patch array includes several first rectangular patches (4a, 4b, 4c, 4d) of series feed；
The transmission line (3) connects one end of first patch array；
It is connected between adjacent first rectangular patch (4a, 4b, 4c, 4d) by the first center signal line (6c)；
The two sides of the first center signal line (6c) are provided with first ground patch (6a)；
First short-circuit part (6b) penetrates the first medium substrate (1) and connects first ground patch (6a) and
One metal floor (2).
2. the Rectangular Microstrip Standing-wave Antennas antenna according to claim 1 based on coplanar waveguide ground, it is characterised in that: further include
Receiving antenna, the receiving antenna includes second medium substrate (7), the second metal floor (8), the second metal patch, second short
Circuit unit (12b), pad (11) and coaxial feed port (13)；
Second metal patch and the second metal floor (8) are separately positioned on two surfaces of the second medium substrate (7)；
Second metal patch includes the second ground patch (12a) and co-planar waveguide of the second patch array, co-planar waveguide
Second center signal line (12c)；
Second patch array includes several second rectangular patches (9a, 9b, 9c, 9d) of series feed；
The pad (11) connects one end of second patch array；
It is connected between adjacent second rectangular patch (9a, 9b, 9c, 9d) by the second center signal line (12c)；
The two sides of the second center signal line (12c) are provided with second ground patch (12a)；
Second short-circuit part (12b) penetrates the dielectric substrate (7) and connects second ground patch (12a) and second
Metal floor (8)；
The coaxial feed port (13) penetrates the dielectric substrate (7) and connects the pad (11).
3. the Rectangular Microstrip Standing-wave Antennas antenna according to claim 1 based on coplanar waveguide ground, it is characterised in that: described
The width of one rectangular patch (4a, 4b, 4c, 4d) is all the same, the length ratio of adjacent first rectangular patch (4a, 4b, 4c, 4d)
For fixed value, the first rectangular patch described in the connecting pin to the other end from first patch array Yu the transmission line (3)
(4a, 4b, 4c, 4d) length gradually decreases.
4. the Rectangular Microstrip Standing-wave Antennas antenna according to claim 2 based on coplanar waveguide ground, it is characterised in that: described
The width of two rectangular patches (9a, 9b, 9c, 9d) is all the same, the length ratio of adjacent second rectangular patch (9a, 9b, 9c, 9d)
For fixed value, the first rectangular patch described in the connecting pin to the other end from second patch array Yu the pad (11) (4a,
4b, 4c, 4d) length gradually decreases.
5. the Rectangular Microstrip Standing-wave Antennas antenna according to claim 1 based on coplanar waveguide ground, it is characterised in that: adjacent institute
The length and width for stating the first center signal line (6c) between the first rectangular patch (4a, 4b, 4c, 4d) is all the same.
6. the Rectangular Microstrip Standing-wave Antennas antenna according to claim 2 based on coplanar waveguide ground, it is characterised in that: adjacent institute
The length and width for stating the second center signal line (12c) between the second rectangular patch (9a, 9b, 9c, 9d) is all the same.
7. the Rectangular Microstrip Standing-wave Antennas antenna according to claim 1 based on coplanar waveguide ground, it is characterised in that: further include
First impedance transformation line (5a), the first impedance transformation line (5a) setting the transmission line (3) and the first patch array it
Between.
8. the Rectangular Microstrip Standing-wave Antennas antenna according to claim 1 based on coplanar waveguide ground, it is characterised in that: further include
Second impedance transformation line (10a), the second impedance transformation line (10a) setting the pad (11) and the second patch array it
Between.
9. the Rectangular Microstrip Standing-wave Antennas antenna according to claim 1 based on coplanar waveguide ground, it is characterised in that: described
The quantity of one patch array and the second patch array is two.
10. the Rectangular Microstrip Standing-wave Antennas antenna according to claim 1 based on coplanar waveguide ground, it is characterised in that: each
First ground patch (6a) is all connected with there are two first short-circuit part (6b), each second ground patch
(12a) is all connected with there are two second short-circuit part (12b).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112557A (en) * | 2019-05-22 | 2019-08-09 | 深圳市华讯方舟微电子科技有限公司 | Couple feed millimeter wave array antenna |
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