CN219350686U - Isolation device for antenna and antenna structure - Google Patents
Isolation device for antenna and antenna structure Download PDFInfo
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- CN219350686U CN219350686U CN202320487127.5U CN202320487127U CN219350686U CN 219350686 U CN219350686 U CN 219350686U CN 202320487127 U CN202320487127 U CN 202320487127U CN 219350686 U CN219350686 U CN 219350686U
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Abstract
The utility model discloses an isolation device for an antenna and an antenna structure. The antenna structure comprises a reflecting plate, a radiation unit array and the isolation device; at least one row of radiation unit arrays are arranged on the reflecting plate, each radiation unit array comprises a plurality of radiation units, and a spacing space is formed between every two adjacent radiation units; the isolation device is arranged in a spacing space between adjacent radiation units. The isolation device can improve the isolation between the high-frequency radiating units in the compact array antenna, improves the radiation performance of the compact array antenna, and has the advantages of simple processing, lower cost and remarkable effect.
Description
Technical Field
The present utility model relates to the field of communication devices, and more particularly, to an isolation device for an antenna and an antenna structure.
Background
It is well known that most MIMO antennas involve high frequencies (3400-3800 MHz), with smaller radiating element sizes and larger spacing between radiating elements. However, for a low frequency MIMO antenna (1710-2200 MHz), the radiating element size is designed to be relatively large, and the spacing between radiating elements is smaller than 0.5λ (λ is the center frequency wavelength of the high frequency radiating element) due to the limitation of the external dimensions of the antenna itself, which results in large energy coupling between radiating elements and deterioration of the isolation of the antenna.
The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The utility model aims to provide an isolation device for an antenna and an antenna structure, which can improve isolation between high-frequency radiating units in a compact array antenna, improve radiation performance of the high-frequency radiating units, and have simple processing, lower cost and remarkable effect.
In order to achieve the above object, the present utility model provides an isolation device for an antenna, which includes a substrate and a microstrip line formed on the substrate, wherein the microstrip line is closed.
In one or more embodiments, the microstrip line is disposed in a loop.
In one or more embodiments, the microstrip line has axial symmetry.
In one or more embodiments, the microstrip line has central symmetry.
In one or more embodiments, the microstrip line has a linewidth of 1.5 to 3mm.
In one or more embodiments, the microstrip line has at least one of the following shapes: concave on both sides, convex on both sides, concave/convex, rectangular, square, semicircular, drop-shaped, circular, oval, and cross.
In one or more embodiments, the sheet material of the substrate is FR4 or rogers board.
The utility model also provides an antenna structure, which comprises a reflecting plate, a radiating element array and the isolation device; at least one row of radiation unit arrays are arranged on the reflecting plate, each radiation unit array comprises a plurality of radiation units, and a spacing space is formed between every two adjacent radiation units; the isolation device is arranged in a spacing space between adjacent radiation units.
In one or more embodiments, the center point of the microstrip line in the isolation device is located on a center horizontal line between adjacent radiation units.
In one or more embodiments, the circumference of the microstrip line in the isolation device is 0.5λ -1.5λ, and the line width is 0.012 λ -0.016 λ, where λ is the operating wavelength corresponding to the central frequency of the radiation unit.
In one or more embodiments, the circumference of the microstrip line in the isolation device is 0.5λ -0.8λ, where λ is an operating wavelength corresponding to a center frequency of the radiation unit.
In one or more embodiments, the height of the microstrip line relative to the reflection plate is 0.12λ -0.2λ, where λ is an operating wavelength corresponding to a center frequency of the radiation unit.
In one or more embodiments, the line width of the microstrip line in the isolation device is 0.012 λ -0.016 λ, where λ is an operating wavelength corresponding to a center frequency of the radiation unit.
In one or more embodiments, the radiating element array includes at least three radiating elements, and a space is formed between adjacent radiating elements, and microstrip lines in isolation devices within the space are identical or different in shape.
In one or more embodiments, the antenna structure includes:
the radiation unit arrays are arranged on the reflecting plate, each row of radiation unit arrays comprises a plurality of radiation units, a spacing space is formed between every two adjacent radiation units, and the radiation units in the adjacent radiation unit arrays are correspondingly arranged;
the isolation device is arranged in a spacing space between the adjacent radiation units;
the center points of the microstrip lines in the same row of the radiating element arrays are positioned on the center horizontal line between the adjacent radiating elements in the row, and the isolation devices in the adjacent radiating element arrays are correspondingly arranged.
In one or more embodiments, centers of the corresponding radiation units in the adjacent radiation unit arrays are located on the same horizontal line, and centers of the microstrip lines of the corresponding isolation devices in the adjacent radiation unit arrays are located on the same horizontal line.
Compared with the prior art, the isolation device for the antenna adopts the closed microstrip line mode, is inlaid in the antenna array, can greatly improve isolation of single-column radiating units, and reduces coupling degree between arrays.
The isolation device for the antenna can cover the bandwidth 1710-2200MHz of the high-frequency antenna, effectively solves the problem that the cross polarization level in the antenna is deteriorated due to serious coupling of the radiating elements because of self isolation of single-column radiating elements in the high-frequency compact antenna or isolation between arrays.
The isolation device for the antenna is simple in design, low in cost and flexible in form.
According to the antenna structure, the isolation device corresponding to the central frequency of the radiating unit is arranged, so that the cross polarization performance, the isolation degree and the return loss are greatly improved.
Drawings
Fig. 1 is a schematic structural view of an isolation device for an antenna according to an embodiment of the present utility model.
Fig. 2 a-2 d are schematic structural views of isolation devices for antennas according to other embodiments of the present utility model.
Fig. 3 is a schematic structural diagram of an antenna structure according to an embodiment of the present utility model.
Fig. 4a is a cross polarization ratio waveform of an antenna structure according to an embodiment of the present utility model.
Fig. 4b is a cross polarization ratio waveform of an antenna structure according to an embodiment of the present utility model with the side column isolation device removed.
Fig. 5a is a cross polarization ratio waveform of an antenna structure according to an embodiment of the present utility model.
Fig. 5b is a cross polarization ratio waveform of an antenna structure according to an embodiment of the present utility model with the middle column spacer removed.
Fig. 6 is a diagram showing the isolation between an antenna structure according to an embodiment of the present utility model and an antenna structure without an isolation device.
Fig. 7 is a graph comparing return loss of an antenna structure according to an embodiment of the present utility model with that of an antenna structure without an isolation device.
Detailed Description
The following detailed description of embodiments of the utility model is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the utility model is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
As described in the background art, the low-frequency antenna has a relatively large radiation unit size due to its own size limitation, which results in a large energy coupling between the radiation units, and thus, the isolation of the antenna is deteriorated.
In order to solve the above technical problems, the present utility model provides an isolation device for an antenna, which adopts a loop-shaped closed microstrip line structure, when the isolation device is placed in the antenna, the isolation of a single-column radiating element can be greatly improved, and the coupling degree between arrays can be reduced.
As shown in fig. 1, an embodiment of the present utility model provides an isolation device 100 for an antenna, which includes a substrate 10 and a microstrip line 20 formed on the substrate 10, wherein the microstrip line 20 is disposed in a closed manner.
The substrate 10 is used as a support body of the microstrip line 20, and the board material can be FR4 or rogers board. The substrate 10 may have a sheet-like plate structure or a ring-shaped closed structure, and the specific shape of the substrate 10 of the ring-shaped closed structure is the same as the shape of the microstrip line 20 formed thereon.
The microstrip line 20 is formed on the substrate 10, the microstrip line 20 has opposite head and tail ends, and the head and tail ends of the microstrip line 20 are in contact connection, so that the microstrip line 20 is closed. Preferably, the microstrip line 20 is in a ring-shaped closed arrangement, and the line width of the microstrip line 20 is preferably 1.5-3 mm. The microstrip line 20 has an axial symmetry or a central symmetry. For example, the microstrip line 20 may have one of the following shapes: concave on both sides (resembling an hourglass shape), convex on both sides (resembling a bucket), concave/convex, rectangular, square, semicircular, drop-shaped, circular, oval, cross-shaped. Reference is made to fig. 2 a-2 d. Microstrip line 20 having axial symmetry or center symmetry has a superior effect on improving cross polarization performance, isolation, and return loss of the antenna.
Referring to fig. 3, the present utility model further provides an antenna structure, which includes a reflecting plate 200, a radiating element array 300, and the above-mentioned isolation device 100; one or more columns of the radiating element arrays 300 are arranged on the reflecting plate 200, each column of the radiating element arrays 300 includes a plurality of radiating elements 301, and a space a is formed between adjacent radiating elements 301. The isolation device 100 is disposed on the reflection plate 200 and located in the interval space a between the adjacent radiation units 301. The center point of the microstrip line in the isolation device 100 is located on the center horizontal line between the adjacent radiating elements 301. When each column of the radiating element array 300 includes at least three radiating elements 301, microstrip lines in the isolation devices 100 within adjacent spacing spaces a are the same or different.
When a plurality of columns of the radiating element arrays 300 are provided, the radiating elements 301 in adjacent radiating element arrays 300 are provided correspondingly, and the centers of the radiating elements 301 provided correspondingly are located on the same horizontal line. The isolation devices 100 are periodically distributed in the multiple columns of the radiating element arrays 300, the isolation devices 100 in the adjacent radiating element arrays 300 are correspondingly arranged, and the center points of the microstrip lines of the isolation devices 100 in the adjacent radiating element arrays 300 are positioned on the same horizontal line.
In the antenna structure, the circumference of the microstrip line 20 in the isolation device 100 has a certain correlation with the center frequency of the radiating element 301 in the antenna structure in which it is located. The circumference of the microstrip line 20 in the isolation device 100 is 0.5λ -1.5λ, and the line width is 0.012 λ -0.016 λ, where λ is the operating wavelength corresponding to the center frequency of the radiating element. Preferably, the circumference of the microstrip line 20 in the isolation device 100 is 0.5λ -0.8λ, where λ is an operating wavelength corresponding to a center frequency of the radiating element. The height of the isolation device 100 relative to the reflective plate 10 can be adjusted by using the support columns, and the height is generally 0.12λ -0.2λ, where λ is the operating wavelength corresponding to the center frequency of the radiation unit.
Illustratively, in a specific embodiment, the reflector plate 200 is provided with four columns of radiating element arrays 300, each column of radiating element arrays 300 including four radiating elements 301, each radiating element 301 being a ±45° dual polarized array radiating element. The spacer 100 is provided in a circular as well as an oval shape. In each row of the radiating element arrays 300, two elliptical isolating devices 100 and one circular isolating device 100 are sequentially embedded in three spacing spaces a. The elliptical spacer 100 at the head end (the upper part in the figure is the head end, and the lower end is the tail end) has its long axis on the central horizontal line between adjacent radiating elements 301. The median elliptical spacer 100 has its minor axis located on the central horizontal line between adjacent radiating elements 301. The circular spacer 100 at the tail end has its center on the center horizontal line between adjacent radiating elements 301.
In other exemplary embodiments, the spacer 100 within the space a may also be rectangular, square, semicircular, drop-shaped, cross-shaped, etc. The shape of the spacer 100 in the different spaces a may be the same or different.
Referring to fig. 4a and 4b, fig. 4a is a cross polarization ratio waveform of the antenna structure of the present utility model; fig. 4b is a cross polarization ratio waveform of the antenna structure of the present utility model with the side column isolation device removed. The data comparison shows that the isolation device 100 has a larger influence on side column oscillators, and the cross polarization specific energy is improved by 5-8 dB.
Referring to fig. 5a and 5b, fig. 5a is a cross polarization ratio waveform of the antenna structure of the present utility model. Fig. 5b is a cross-polarization ratio waveform of the antenna structure of the present utility model with the middle column spacer removed. Through data comparison, the isolation device 100 has small influence on the middle column oscillator, and the cross polarization ratio difference is not very large, so that the design requirement is met.
Referring to fig. 6, fig. 6 is a diagram showing the isolation between the antenna structure of the present utility model and the antenna structure without isolation device. The light waveform in the figure is the data with the isolation device, the dark waveform is the data without the isolation device, and the isolation device is obtained by analyzing the corresponding value, so that the isolation degree of the isolation device for the antenna array is greatly improved, and the isolation device can be optimized by 2-3 dB.
Referring to fig. 7, fig. 7 is a graph comparing return loss of an antenna structure of the present utility model with an antenna structure without an isolation device. S11 and S22 in the diagram corresponding to the +/-45 DEG radiation unit of the antenna array, light waveforms in the diagram are data with the isolation device arranged, and dark waveforms are data without the isolation device, and numerical analysis shows that the isolation device can optimize the isolation degree and improve the return loss by 0.5-1 dB.
Compared with the prior art, the isolation device for the antenna adopts the form of the annular closed microstrip line, and is inlaid in the antenna array, so that the isolation degree of single-column radiating units can be greatly improved, and the coupling degree between arrays can be reduced.
The isolation device for the antenna can cover the bandwidth 1710-2200MHz of the high-frequency antenna, effectively solves the problem that the cross polarization level in the antenna is deteriorated due to serious coupling of the radiating elements because of self isolation of single-column radiating elements in the high-frequency compact antenna or isolation between arrays.
The isolation device for the antenna is simple in design, low in cost and flexible in form.
According to the antenna structure, the isolation device is arranged, so that the cross polarization performance, the isolation degree and the return loss are greatly improved.
The foregoing descriptions of specific exemplary embodiments of the present utility model are presented for purposes of illustration and description. It is not intended to limit the utility model to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the utility model and its practical application to thereby enable one skilled in the art to make and utilize the utility model in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the utility model be defined by the claims and their equivalents.
Claims (16)
1. An isolation device for an antenna is characterized by comprising a substrate and a microstrip line formed on the substrate, wherein the microstrip line is arranged in a closed mode.
2. The isolation device for an antenna according to claim 1, wherein the microstrip line is provided in a loop shape.
3. The isolation device for an antenna according to claim 1, wherein the microstrip line has axial symmetry.
4. The isolation device for an antenna according to claim 1, wherein the microstrip line has center symmetry.
5. The isolation device for an antenna according to claim 1, wherein a line width of the microstrip line is 1.5 to 3mm.
6. The isolation device for an antenna according to claim 1, wherein the microstrip line has at least one of the following shapes: concave on both sides, convex on both sides, concave/convex, rectangular, square, semicircular, drop-shaped, circular, oval, and cross.
7. The isolation device for an antenna according to claim 1, wherein the plate material of the substrate is FR4 or rogex plate.
8. An antenna structure comprising:
a reflection plate;
at least one row of radiation unit arrays arranged on the reflecting plate, wherein each radiation unit array comprises a plurality of radiation units, and a spacing space is formed between every two adjacent radiation units;
an isolation device as claimed in any of claims 1-7, arranged in a spacing space between adjacent ones of said radiating elements.
9. The antenna structure of claim 8, wherein a center point of the microstrip line in the isolation means is located on a center horizontal line between adjacent ones of the radiating elements.
10. The antenna structure of claim 8, wherein the circumference of the microstrip line in the isolation device is 0.5λ -1.5λ, and the line width is 0.012 λ -0.016 λ, where λ is an operating wavelength corresponding to a center frequency of the radiating element.
11. The antenna structure of claim 10, wherein the perimeter of the microstrip line in the isolation device is 0.5λ -0.8λ, where λ is an operating wavelength corresponding to a center frequency of the radiating element.
12. The antenna structure of claim 8, wherein the microstrip line has a height of 0.12λ to 0.2λ relative to the reflection plate, where λ is an operating wavelength corresponding to a center frequency of the radiation unit.
13. The antenna structure of claim 8, wherein the line width of the microstrip line in the isolation device is 0.012 λ -0.016 λ, where λ is an operating wavelength corresponding to a center frequency of the radiating element.
14. The antenna structure according to claim 8, wherein the radiating element array includes at least three radiating elements, and a space is formed between adjacent radiating elements, and microstrip lines in the isolation devices within the space are identical or different in shape.
15. The antenna structure of claim 8, wherein the antenna structure comprises:
the radiation unit arrays are arranged on the reflecting plate, each row of radiation unit arrays comprises a plurality of radiation units, a spacing space is formed between every two adjacent radiation units, and the radiation units in the adjacent radiation unit arrays are correspondingly arranged;
the isolation device is arranged in a spacing space between the adjacent radiation units;
the center points of the microstrip lines in the same row of the radiating element arrays are positioned on the center horizontal line between the adjacent radiating elements in the row, and the isolation devices in the adjacent radiating element arrays are correspondingly arranged.
16. The antenna structure of claim 15, wherein centers of the corresponding radiating elements in adjacent radiating element arrays are on the same horizontal line, and centers of the microstrip lines of the corresponding isolation devices in adjacent radiating element arrays are on the same horizontal line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320487127.5U CN219350686U (en) | 2023-03-14 | 2023-03-14 | Isolation device for antenna and antenna structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320487127.5U CN219350686U (en) | 2023-03-14 | 2023-03-14 | Isolation device for antenna and antenna structure |
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| Publication Number | Publication Date |
|---|---|
| CN219350686U true CN219350686U (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320487127.5U Active CN219350686U (en) | 2023-03-14 | 2023-03-14 | Isolation device for antenna and antenna structure |
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| CN (1) | CN219350686U (en) |
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- 2023-03-14 CN CN202320487127.5U patent/CN219350686U/en active Active
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