CN212277385U - Single-side feeder ultra-wideband MIMO antenna - Google Patents
Single-side feeder ultra-wideband MIMO antenna Download PDFInfo
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- CN212277385U CN212277385U CN202021215630.8U CN202021215630U CN212277385U CN 212277385 U CN212277385 U CN 212277385U CN 202021215630 U CN202021215630 U CN 202021215630U CN 212277385 U CN212277385 U CN 212277385U
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Abstract
The utility model provides a single-side feeder ultra-wideband MIMO antenna, which comprises a terminal metal shell, a plastic bracket, a plurality of feed lines and a plurality of feed lines, wherein a rectangular containing groove is arranged in the terminal metal shell; the PCB substrate is connected with the plastic support through a double-sided adhesive tape, one face of the plastic support is provided with a first antenna unit, a second antenna unit and a third antenna unit, the first antenna unit, the fifth antenna unit and the sixth antenna unit are close to one face of the plastic support, the first antenna unit and the sixth antenna unit are arranged in a crossed mode, the second antenna unit and the fifth antenna unit are arranged in a crossed mode, and the third antenna unit and the fourth antenna unit are arranged in a crossed mode. The antenna not only covers the existing commonly used 4G network, but also covers the existing 5G mainstream network (sub-6G); the volume is small, the assembly is simple, the cost is low, and the batch production is easy.
Description
Technical Field
The utility model relates to the technical field of antennas, especially, relate to a single face feeder ultra wide band MIMO antenna.
Background
With the rapid development of 5G communication technology, more and more frequency bands and more antennas are required to be supported by wireless communication terminal equipment, MIMO (Multiple-Input Multiple-Output,
multiple input multiple output system) technology has become the mainstream technology of 5G mobile communication devices. The current mobile communication terminals tend to be miniaturized and planarized, so the antenna design must be as small as possible while maintaining performance.
For some current large-scale enterprise routing devices including 5G bands, the common operating bands thereof are LTE (1710-. For such related devices, the layout of the antenna generally considers both external and internal types. When the external antenna is adopted, the number of the antennas is too large, the occupied space is large, the layout is difficult, and the overall attractiveness is affected. If the internal antenna is used, the antenna must be embedded inside the communication device, and the internal environment of the communication device will cause severe interference to the antenna pattern. In addition, when the number of antennas is large, a plurality of antennas must be arranged in a small internal space, and the isolation is also problematic. Therefore, it is an urgent technical problem to be solved by those skilled in the art how to design an antenna with easy installation, high isolation between antennas, and wide bandwidth in a communication terminal.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem provide a single face feeder ultra wide band MIMO antenna.
In order to solve the technical problem, the utility model provides a single face feeder ultra wide band MIMO antenna, include:
the terminal metal shell is internally provided with a rectangular accommodating groove;
the plastic bracket is positioned in the rectangular accommodating groove and is connected with the terminal metal shell through a screw;
the PCB substrate is connected with the plastic support through a double-sided adhesive tape, one surface of the PCB substrate, which is far away from the plastic support, is provided with a first antenna unit, a second antenna unit and a third antenna unit, one surface of the PCB substrate, which is close to the plastic support, is provided with a fourth antenna unit, a fifth antenna unit and a sixth antenna unit, the first antenna unit and the sixth antenna unit are arranged in a crossed manner, the second antenna unit and the fifth antenna unit are arranged in a crossed manner, and the third antenna unit and the fourth antenna unit are arranged in a crossed manner; the first antenna unit and the third antenna unit are symmetrically arranged.
Furthermore, a plurality of small holes are formed in one end of the terminal metal shell, limiting baffles are arranged on two sides of the terminal metal shell, a first opening is formed in the middle of one limiting baffle, a second opening is formed in one end of the other limiting baffle, and a third opening is formed in the other end of the other limiting baffle.
Further, the plastic support is provided with a mounting groove matched with the PCB substrate, and the PCB substrate is positioned in the mounting groove; the two ends and the two sides of the plastic support are respectively provided with an ear plate, and the plastic support is locked with the terminal metal shell through screws penetrating through the ear plates.
Further, the first antenna unit includes a first upper half-wave array sub-arm, a first lower half-wave array sub-arm, a first feeding point disposed on the first upper half-wave array sub-arm, a first feeding point disposed on the first lower half-wave array sub-arm, and a first coaxial cable disposed at the first antenna unit, a ground line of the first coaxial cable is connected to the first feeding point, and lengths of the first upper half-wave array sub-arm and the first lower half-wave array sub-arm are one quarter of a working wavelength of the first antenna unit.
Further, the sixth antenna unit includes a sixth upper half-wave array sub-arm and a sixth lower half-wave array sub-arm, and ± 45-degree cross polarization is formed between the sixth upper half-wave array sub-arm and the sixth lower half-wave array sub-arm and between the first upper half-wave array sub-arm and the first lower half-wave array sub-arm.
Furthermore, the second antenna unit includes a second upper half-wave array sub-arm, a second lower half-wave array sub-arm, a second feed point disposed on the second upper half-wave array sub-arm, a second feed point disposed on the second lower half-wave array sub-arm, and a second coaxial cable disposed at the second antenna unit, and a ground line of the second coaxial cable is connected to the second feed point.
Further, the fifth antenna unit includes a fifth upper half-wave array sub-arm and a fifth lower half-wave array sub-arm, and ± 45-degree cross polarization is formed between the fifth upper half-wave array sub-arm and the fifth lower half-wave array sub-arm and between the second upper half-wave array sub-arm and the second lower half-wave array sub-arm.
Furthermore, the third antenna unit includes a third upper half-wave array sub-arm, a third lower half-wave array sub-arm, a third feeding point disposed on the third upper half-wave array sub-arm, a third feeding point disposed on the third lower half-wave array sub-arm, and a third coaxial cable disposed at the third antenna unit, and a ground line of the third coaxial cable is connected to the third feeding point.
Further, the fourth antenna unit includes a fourth upper half-wave array sub-arm, a fourth lower half-wave array sub-arm, a fourth ground feeding metal through hole disposed on the fourth upper half-wave array sub-arm, a fourth ground feeding metal through hole disposed on the fourth lower half-wave array sub-arm, a fourth ground feeding point disposed at the third antenna unit and connected to the fourth ground feeding metal through hole, a fourth feeding point connected to the fourth ground feeding metal through hole, and a fourth coaxial cable disposed at the third antenna unit, a signal line of the fourth coaxial cable is connected to the fourth feeding point, and a ground line of the fourth coaxial cable is connected to the fourth ground feeding point.
Furthermore, a +/-45-degree cross polarization is formed between the fourth upper half-wave array sub-arm and the fourth lower half-wave array sub-arm and between the third upper half-wave array sub-arm and the third lower half-wave array sub-arm, and rectangular notches are formed in the upper corners of the edges, close to the first antenna unit, of the PCB substrate.
The utility model discloses a single face feeder ultra wide band MIMO antenna will through the screw the plastic support with lock in the rectangle accepting groove of terminal metal casing, the reuse the double faced adhesive tape will the PCB base plate with the plastic support pastes together, has realized the PCB base plate, the plastic support and the terminal metal casing equipment integration, adopts this kind of structure equipment mode, makes this single face feeder ultra wide band MIMO antenna neither occupy the inner space of terminal nor influence the whole pleasing to the eye of product, simultaneously, has the clearance form the cavity radiation in the terminal metal casing, guarantee the normal propagation of electromagnetic wave; the first antenna unit and the sixth antenna unit of the PCB substrate are arranged in a crossed mode, the second antenna unit and the fifth antenna unit are arranged in a crossed mode, and +/-45-degree cross polarization is formed respectively, so that the same-frequency isolation is improved, and the same-frequency interference is avoided; the antenna not only covers the existing commonly used 4G network, but also covers the existing 5G mainstream network (sub-6G); the volume is small, the assembly is simple, the cost is low, and the batch production is easy.
Drawings
Fig. 1 is an exploded view of a single-sided feeder ultra-wideband MIMO antenna of the present invention;
fig. 2 is a schematic diagram of the front side of the PCB substrate of the single-sided feeder ultra-wideband MIMO antenna of the present invention;
fig. 3 is a schematic diagram of the reverse side of the PCB substrate of the single-sided feeder ultra-wideband MIMO antenna of the present invention;
fig. 4 is a voltage standing wave ratio diagram of the second antenna unit of the single-sided feeder ultra-wideband MIMO antenna of the present invention in the working frequency band;
fig. 5 is a voltage standing wave ratio diagram of a fourth antenna unit of the single-sided feeder ultra-wideband MIMO antenna of the present invention in a working frequency band;
fig. 6 is a voltage standing wave ratio diagram of the first antenna unit and the third antenna unit of the single-sided feeder ultra-wideband MIMO antenna of the present invention in the working frequency band;
fig. 7 is an isolation diagram of the first antenna unit and the third antenna unit of the single-sided feeder ultra-wideband MIMO antenna of the present invention in the working frequency band;
labeled as: a terminal metal housing 1, a rectangular receiving slot 11, a small hole 12, a limit baffle 13, a first opening 14, a second opening 15, a third opening 16, a plastic support 2, a mounting slot 21, an ear plate 22, a double-sided tape 3, a PCB substrate 4, a first antenna element 41, a first upper half wave array sub-arm 411, a first feeding point 412, a first feeding point 413, a first lower half wave array sub-arm 414, a first coaxial cable 415, a second antenna element 42, a second lower half wave array sub-arm 421, a second feeding point 422, a second feeding point 423, a second upper half wave array sub-arm 424, a second coaxial cable 425, a third antenna element 43, a third upper half wave array sub-arm 431, a third feeding point 432, a third feeding point 433, a third lower half wave array sub-arm 434, a third coaxial cable 435, a fourth antenna element 44, a fourth feeding point 441, a fourth feeding point 443, a fourth upper half wave array sub-arm 444, a fourth ground feeding metal through hole 445, a fourth ground feeding metal through hole 446, a fourth lower half wave array sub-arm 447, a fifth antenna element 45, a fifth lower half wave array sub-arm 451, a fifth upper half wave array sub-arm 452, a sixth antenna element 46, a sixth upper half wave array sub-arm 461, a sixth lower half wave array sub-arm 462, and a notch 47.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 1 and 7, a single-sided feeder ultra-wideband MIMO antenna includes: a plastic bracket 2, which is positioned in the rectangular accommodating groove 11 and is connected with the terminal metal shell 1 through a screw (not shown); the PCB substrate 4 is connected with the plastic support 2 through a double-sided adhesive tape 3, one surface of the PCB substrate, which is far away from the plastic support 2, is provided with a first antenna unit 41, a second antenna unit 42 and a third antenna unit 43, one surface of the PCB substrate, which is close to the plastic support 2, is provided with a fourth antenna unit 44, a fifth antenna unit 45 and a sixth antenna unit 46, the first antenna unit 41 and the sixth antenna unit 46 are arranged in a crossed manner, the second antenna unit 42 and the fifth antenna unit 45 are arranged in a crossed manner, and the third antenna unit 43 and the fourth antenna unit 44 are arranged in a crossed manner; the first antenna element 41 and the third antenna element 43 are symmetrically arranged. The plastic support 2 and the plastic support 2 are locked in the rectangular containing groove 11 of the terminal metal shell 1 through screws, and then the PCB substrate 4 and the plastic support 2 are adhered together through the double-sided adhesive tape 3, so that the PCB substrate 4, the plastic support 2 and the terminal metal shell 1 are assembled and integrated, by adopting the structure assembling mode, the single-side feeder line ultra-wideband MIMO antenna does not occupy the internal space of the terminal and influence the integral appearance of a product, and meanwhile, cavity radiation is formed in the terminal metal shell 1 with gaps, so that the normal transmission of electromagnetic waves is ensured; the first antenna unit 41 and the sixth antenna unit 46 of the PCB substrate 4 are arranged in a crossed manner, and the second antenna unit 42 and the fifth antenna unit 45 are arranged in a crossed manner, so that ± 45-degree cross polarization is formed, the same frequency isolation is improved, and the same frequency interference is also avoided; the antenna not only covers the existing commonly used 4G network, but also covers the existing 5G mainstream network (sub-6G); the volume is small, the assembly is simple, the cost is low, and the batch production is easy.
The first antenna unit 41 and the third antenna unit 43 belong to the same frequency band, are both 1710-5000Mhz, and are symmetrically arranged to form orthogonal polarization, thereby avoiding co-channel interference.
A plurality of small holes 12 are uniformly distributed in one end of the terminal metal shell 1, limiting baffle plates 13 are arranged on two sides of the terminal metal shell 1, a first opening 14 is formed in the middle of one limiting baffle plate 13, a second opening 15 is formed in one end of the other limiting baffle plate 13, and a third opening 16 is formed in the other end of the other limiting baffle plate. The second opening is located at an end away from the third antenna element 43, which facilitates the mounting and dismounting of the plastic bracket 2.
The plastic support 2 is provided with a mounting groove 21 matched with the PCB substrate 4, and the PCB substrate 4 is positioned in the mounting groove 21; the two ends and the two sides of the plastic support 2 are respectively provided with an ear plate 22, and the plastic support 2 is locked with the terminal metal shell 1 through screws penetrating through the ear plates 22.
The first antenna element 41 includes a first upper half-wave array sub-arm 411, a first lower half-wave array sub-arm 414, a first feeding point 412 disposed on the first upper half-wave array sub-arm 411, a first feeding point 413 disposed on the first lower half-wave array sub-arm 412, and a first coaxial cable 415 disposed at the first antenna element 41, a ground line of the first coaxial cable 415 is connected to the first feeding point 413, and a length of the first upper half-wave array sub-arm 411 and the first lower half-wave array sub-arm 414 is one quarter of an operating wavelength of the first antenna element 41.
The sixth antenna element 46 includes a sixth upper half-wave array sub-arm 461 and a sixth lower half-wave array sub-arm 462, and ± 45-degree cross polarization is formed between the sixth upper half-wave array sub-arm 461 and the sixth lower half-wave array sub-arm 462 and the first upper half-wave array sub-arm 411 and the first lower half-wave array sub-arm 412.
The second antenna unit 42 includes a second upper half-wave array sub-arm 424, a second lower half-wave array sub-arm 421, a second feeding point 423 disposed on the second upper half-wave array sub-arm 424, a second feeding point 422 disposed on the second lower half-wave array sub-arm 421, and a second coaxial cable 425 disposed at the second antenna unit 42, and a ground line of the second coaxial cable 425 is connected to the second feeding point 423.
The fifth antenna element 45 includes a fifth upper half-wave array sub-arm 452 and a fifth lower half-wave array sub-arm 451, and ± 45-degree cross polarization is formed between the fifth upper half-wave array sub-arm 452 and the fifth lower half-wave array sub-arm 451 and between the second upper half-wave array sub-arm and the second lower half-wave array sub-arm.
The third antenna element 43 includes a third upper half-wave array sub-arm 431, a third lower half-wave array sub-arm 434, a third feeding point 432 disposed on the third upper half-wave array sub-arm 431, a third feeding point 433 disposed on the third lower half-wave array sub-arm 434, and a third coaxial cable 435 disposed at the third antenna element 43, and a ground line of the third coaxial cable 435 is connected to the third feeding point 433.
The fourth antenna unit 44 includes a fourth upper half-wave array sub-arm 444, a fourth lower half-wave array sub-arm 447, a fourth ground feeding metal through hole 445 provided in the fourth upper half-wave array sub-arm 444, a fourth ground feeding metal through hole 446 provided in the fourth lower half-wave array sub-arm 447, a fourth ground feeding point 442 provided at the third antenna unit 43 and connected to the fourth ground feeding metal through hole 445 and a fourth ground feeding point 441 connected to the fourth ground feeding metal through hole 446, and a fourth coaxial cable 443 provided at the third antenna unit 43, a signal line of the fourth coaxial cable 443 is connected to the fourth ground feeding point 441, and a ground line of the fourth coaxial cable 443 is connected to the fourth ground feeding point 442. The signal line of the fourth coaxial cable 443 is connected to the fourth feeding point 441 of the PCB substrate 4, the ground line of the fourth coaxial cable 443 is connected to the feeding point of the PCB substrate 4, the fourth feeding point 441 and the fourth feeding point 442 of the fourth antenna unit 44 on the reverse side of the PCB substrate 4 are led to the front side of the PCB substrate 4 through the fourth feeding metal through hole 446 and the fourth feeding metal through hole 445, and the fourth coaxial cable 443 is led out from the front side of the PCB substrate 4, so that a total of 4 antennas are arranged in a small-sized space with a length of 136mm and a width of 36mm, and six antennas are arranged, thereby ensuring the convenience of assembling the PCB substrate 4 and the plastic bracket 2, fully utilizing the back space of the PCB substrate 4, and achieving a high integration degree.
The fourth upper half-wave array sub-arm 444 and the fourth lower half-wave array sub-arm 447, and the third upper half-wave array sub-arm 431 and the third lower half-wave array sub-arm 434 form ± 45-degree cross polarization therebetween.
The reverse side of the PCB substrate 4 contains a total of 3 antenna radiation elements, which are the fourth antenna element 44, the fifth antenna element 45, and the sixth antenna element 46. Two pairs of half- wave array sub-arms 411, 414 and 461, 462, half- wave array sub-arms 421, 424 and 451, 452, half- wave array sub-arms 431, 434 and 444, 447 are arranged on the upper layer and the lower layer of the PCB, and the radiation sheets are coupled with each other to generate additional resonance, so that the ultra-wideband antenna is formed.
Fig. 4 is a graph of the voltage standing wave ratio of the second antenna unit 42 of the single-sided feeder ultra-wideband MIMO antenna in the operating frequency band, and the result shows that the voltage standing wave ratio is less than 2.0 in the entire operating frequency band (2496-.
Fig. 5 is a graph of the voltage standing wave ratio of the fourth antenna unit 44 of the single-sided feeder ultra-wideband MIMO antenna in the working frequency band, and the result shows that the voltage standing wave ratio is less than 2.5 in the whole working frequency band (1710-.
Fig. 6 is a graph of voltage standing wave ratio of the first antenna unit 41 and the third antenna unit 43 of the single-sided feeder ultra-wideband MIMO antenna in the working frequency band, and the result shows that the voltage standing wave ratio is less than 2.7 in the whole working frequency band (1710-.
Fig. 7 is a diagram of isolation in the working frequency band of the first antenna unit radiating unit 41 and the third antenna unit 43 of the single-sided feeder ultra-wideband MIMO antenna, and the result shows that the isolation of any two antennas with the same frequency is excellent by-13 dB in the whole working frequency band (1710-5000 MHz), which indicates that the single-sided feeder ultra-wideband MIMO antenna also achieves good isolation performance in the whole working frequency band range.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and those skilled in the art can make many variations and modifications of the technical solution of the present invention without departing from the scope of the technical solution of the present invention.
Claims (10)
1. A single-sided feeder ultra-wideband MIMO antenna, comprising:
the terminal metal shell is internally provided with a rectangular accommodating groove;
the plastic bracket is positioned in the rectangular accommodating groove and is connected with the terminal metal shell through a screw;
the PCB substrate is connected with the plastic support through a double-sided adhesive tape, one surface of the PCB substrate, which is far away from the plastic support, is provided with a first antenna unit, a second antenna unit and a third antenna unit, one surface of the PCB substrate, which is close to the plastic support, is provided with a fourth antenna unit, a fifth antenna unit and a sixth antenna unit, the first antenna unit and the sixth antenna unit are arranged in a crossed manner, the second antenna unit and the fifth antenna unit are arranged in a crossed manner, and the third antenna unit and the fourth antenna unit are arranged in a crossed manner; the first antenna unit and the third antenna unit are symmetrically arranged.
2. The single-sided feeder ultra-wideband MIMO antenna of claim 1, wherein: the terminal metal shell is characterized in that a plurality of small holes are formed in one end of the terminal metal shell, limiting baffles are arranged on two sides of the terminal metal shell, a first opening is formed in the middle of one limiting baffle, a second opening is formed in one end of the other limiting baffle, and a third opening is formed in the other end of the limiting baffle.
3. The single-sided feeder ultra-wideband MIMO antenna of claim 1, wherein: the plastic support is provided with a mounting groove matched with the PCB substrate, and the PCB substrate is positioned in the mounting groove; the two ends and the two sides of the plastic support are respectively provided with an ear plate, and the plastic support is locked with the terminal metal shell through screws penetrating through the ear plates.
4. The single-sided feeder ultra-wideband MIMO antenna of claim 1, wherein: the first antenna unit comprises a first upper half-wave array sub-arm, a first lower half-wave array sub-arm, a first feeding point arranged on the first upper half-wave array sub-arm, a first feeding point arranged on the first lower half-wave array sub-arm and a first coaxial cable arranged at the first antenna unit, wherein the ground wire of the first coaxial cable is connected with the first feeding point, and the lengths of the first upper half-wave array sub-arm and the first lower half-wave array sub-arm are one fourth of the working wavelength of the first antenna unit.
5. The single-sided feeder ultra-wideband MIMO antenna of claim 4, wherein: the sixth antenna unit comprises a sixth upper half-wave array sub-arm and a sixth lower half-wave array sub-arm, and the sixth upper half-wave array sub-arm and the sixth lower half-wave array sub-arm form +/-45-degree cross polarization with the first upper half-wave array sub-arm and the first lower half-wave array sub-arm.
6. The single-sided feeder ultra-wideband MIMO antenna of claim 1, wherein: the second antenna unit comprises a second upper half-wave array sub-arm, a second lower half-wave array sub-arm, a second feed point arranged on the second upper half-wave array sub-arm, a second feed point arranged on the second lower half-wave array sub-arm and a second coaxial cable arranged at the second antenna unit, and the ground wire of the second coaxial cable is connected with the second feed point.
7. The single-sided feeder ultra-wideband MIMO antenna of claim 6, wherein: the fifth antenna unit comprises a fifth upper half-wave array sub-arm and a fifth lower half-wave array sub-arm, and the fifth upper half-wave array sub-arm and the fifth lower half-wave array sub-arm form +/-45-degree cross polarization with the second upper half-wave array sub-arm and the second lower half-wave array sub-arm.
8. The single-sided feeder ultra-wideband MIMO antenna of claim 1, wherein: the third antenna unit comprises a third upper half-wave array sub-arm, a third lower half-wave array sub-arm, a third feeding point arranged on the third upper half-wave array sub-arm, a third feeding point arranged on the third lower half-wave array sub-arm and a third coaxial cable arranged at the third antenna unit, and a ground wire of the third coaxial cable is connected with the third feeding point.
9. The single-sided feeder ultra-wideband MIMO antenna of claim 8, wherein: the fourth antenna unit comprises a fourth upper half wave array sub-arm, a fourth lower half wave array sub-arm, a fourth ground feeding metal through hole arranged on the fourth upper half wave array sub-arm, a fourth ground feeding metal through hole arranged on the fourth lower half wave array sub-arm, a fourth ground feeding point arranged at the third antenna unit and connected with the fourth ground feeding metal through hole, a fourth feeding point connected with the fourth ground feeding metal through hole, and a fourth coaxial cable arranged at the third antenna unit, wherein a signal wire of the fourth coaxial cable is connected with the fourth feeding point, and a ground wire of the fourth coaxial cable is connected with the fourth ground feeding point.
10. The single-sided feeder ultra-wideband MIMO antenna of claim 9, wherein: the fourth upper half wave array sub-arm and the fourth lower half wave array sub-arm and the third upper half wave array sub-arm and the third lower half wave array sub-arm form +/-45-degree cross polarization, and rectangular notches are formed in the upper corners of the edges, close to the first antenna unit, of the PCB substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021215630.8U CN212277385U (en) | 2020-06-28 | 2020-06-28 | Single-side feeder ultra-wideband MIMO antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021215630.8U CN212277385U (en) | 2020-06-28 | 2020-06-28 | Single-side feeder ultra-wideband MIMO antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212277385U true CN212277385U (en) | 2021-01-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021215630.8U Active CN212277385U (en) | 2020-06-28 | 2020-06-28 | Single-side feeder ultra-wideband MIMO antenna |
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| Country | Link |
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| CN (1) | CN212277385U (en) |
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2020
- 2020-06-28 CN CN202021215630.8U patent/CN212277385U/en active Active
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