CN210926309U - Low-frequency radiation unit and MIMO antenna - Google Patents
Low-frequency radiation unit and MIMO antenna Download PDFInfo
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- CN210926309U CN210926309U CN201922441660.4U CN201922441660U CN210926309U CN 210926309 U CN210926309 U CN 210926309U CN 201922441660 U CN201922441660 U CN 201922441660U CN 210926309 U CN210926309 U CN 210926309U
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Abstract
The utility model provides a low frequency radiation unit and MIMO antenna, wherein, the low frequency radiation unit includes the base, four barrons of being connected with the base and supports in four dipoles of base top by four barrons respectively, and every dipole includes a pair of radiating arm, the radiating arm includes first unit arm, second unit arm and perpendicular arm, and the second unit arm extends the setting along the direction that is close to adjacent radiating arm in rather than adjacent dipole, and the relative first unit arm indent of outside edge of second unit arm sets up, and the outside of second unit arm upwards buckles and forms perpendicular arm. The utility model provides an among the low frequency radiation unit, second cell arm adopts the structure that the indent set up, can effectively increase second cell arm and rather than the relative distance of another adjacent radiating element to reduce the coupling influence, and can improve the deterioration of S parameter and directional diagram that the indent setting of second cell arm brought through perpendicular arm, ensure low frequency radiation unit' S electrical property is good.
Description
Technical Field
The utility model relates to a mobile communication technology field especially relates to a low frequency radiating element and adoption low frequency radiating element's MIMO antenna.
Background
With the rapid development of mobile communication technology, under the current large environment where 2G, 3G, 4G and even 5G networks coexist, multi-frequency and miniaturization become important development trends of MIMO antennas, and a high-low frequency nesting and multi-frequency side-by-side scheme is a main method for realizing multi-frequency of MIMO antennas.
However, in order to meet the requirement of miniaturization, the distance between the antenna arrays needs to be reduced as much as possible, and due to the coupling effect, mutual interference exists between the antenna arrays, and the smaller the distance, the larger the energy coupling, the larger the mutual influence. When the distance between the high-frequency and low-frequency arrays is reduced to a certain degree, the low-frequency radiation unit has obvious deterioration effect on a high-frequency antenna directional diagram, standing waves and isolation, meanwhile, the high-frequency arrays can also cause deterioration effect on a low-frequency direction and a circuit, the high-frequency and low-frequency arrays are mutually influenced, and the different-frequency isolation between the high-frequency and low-frequency arrays is also sharply reduced. Therefore, effectively reducing the coupling effect between the radiating elements becomes a key technology for realizing the miniaturization of the antenna.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a first purpose aims at providing one kind and can reduce the coupling influence and the good low frequency radiating element of performance to other radiating elements.
Another object of the present invention is to provide a MIMO antenna using the above low frequency radiating element.
In order to achieve the above object, the present invention provides the following technical solutions:
as a first aspect, the utility model relates to a low frequency radiation unit, including the base, with four baluns that the base is connected with respectively by four baluns support in four dipoles above the base, every dipole includes a pair of radiation arm, the radiation arm includes first cell arm, second cell arm and perpendicular arm, first cell arm with the balun is connected, second cell arm with first cell arm is connected, second cell arm extends the setting along the direction that is close to adjacent radiation arm in rather than adjacent dipole, and the relative first cell arm indent of outside edge of second cell arm sets up, just the outside of second cell arm upwards buckles and forms perpendicular arm.
Preferably, the low-frequency radiating unit further includes a dielectric assembly having two ends respectively connected to two adjacent radiating arms of two adjacent dipoles.
Preferably, the dielectric assembly comprises an insulating dielectric clip provided with a slot, the slot being plugged into the vertical arm.
Preferably, the dielectric assembly further includes a coupling tab disposed on the insulating dielectric clip and insulated from the radiating arm by the insulating dielectric clip.
Furthermore, the coupling piece is provided with a riveting hole, and the coupling piece can pass through the riveting hole through an insulating rivet to be riveted and fixed relative to the insulating medium clamp.
Preferably, the radiating arm further includes a lower radiating surface extending to be bent downward along an inner side of the second unit arm.
As a second aspect, the present invention further relates to a MIMO antenna, which includes a reflection plate, at least one high frequency array and at least one low frequency array, the high frequency array includes at least one high frequency radiation unit, and the low frequency array includes at least one low frequency radiation unit.
Preferably, the high-frequency array comprises a first high-frequency array which is arranged on the reflecting plate and is coaxial with the low-frequency array, the first high-frequency array comprises a first high-frequency radiation unit, and the first high-frequency radiation unit is nested in the low-frequency radiation unit and/or is arranged between two adjacent low-frequency radiation units.
Preferably, the high-frequency array includes a second high-frequency array, which is arranged on the reflector plate side by side with the low-frequency array, and in the second high-frequency array and the low-frequency array adjacent to the second high-frequency array, the high-frequency radiating unit of the second high-frequency array includes a second high-frequency radiating unit and a third high-frequency radiating unit, a projection of the second high-frequency radiating unit in the low-frequency array is located in a range of a radiating arm of the low-frequency radiating unit directly opposite to the second high-frequency radiating unit, and a projection of the third high-frequency radiating unit in the low-frequency array is located in a gap between two adjacent low-frequency radiating units.
Preferably, the horizontal spacing between the second high-frequency radiating element and the low-frequency array adjacent to the second high-frequency radiating element is larger than the horizontal spacing between the third high-frequency radiating element and the low-frequency array adjacent to the third high-frequency radiating element.
Compared with the prior art, the utility model discloses a scheme has following advantage:
1. the utility model provides an among the low frequency radiation unit, the relative first cell arm indent of outside edge of second cell arm sets up, can effectively increase in the antenna that adopts this low frequency radiation unit the relative distance of second cell arm and rather than adjacent another radiation unit to reduce the coupling influence, and this low frequency radiation unit 'S radiation arm still includes the perpendicular arm of the outside inflection extension of following second cell arm, through perpendicular arm can improve the deterioration of S parameter and directional diagram that the indent setting of second cell arm brought, ensures low frequency radiation unit' S electrical property is good.
2. The utility model provides an among the low frequency radiation unit, be equipped with insulating medium on the radiation arm and press from both sides, through the dielectric constant that insulating medium pressed from both sides can be equivalent increases the resonance length of radiation arm and the height of balun, thereby effectively improves low frequency radiation unit's directional diagram, standing wave and isolation.
3. The utility model provides a low frequency radiation unit is including locating the coupling piece on the insulating medium presss from both sides, can effectively promote the convergence of the S parameter of low frequency radiation unit can further overcome the deterioration of the S parameter that the indent design of second unit arm brought.
4. The utility model provides a MIMO antenna is in adjacent second high frequency array and low frequency array, and the projection of the high frequency radiating element of second high frequency array in the low frequency array is located the radiation arm within range of the low frequency radiating element of low frequency array or in the clearance of two adjacent low frequency radiating elements, avoids the sensitive position of high frequency radiating element to adjacent low frequency radiating element, reduces the influence between the high low frequency radiating element, promotes the antenna performance.
5. The utility model provides a MIMO antenna in adjacent second high frequency array and low frequency array, just to the second high frequency radiating element of low frequency radiating element with the horizontal interval of low frequency array be greater than just to the third high frequency radiating element in clearance between two adjacent low frequency radiating elements with the horizontal interval of low frequency array, just keep away from the second high frequency radiating element of low frequency radiating element promptly the low frequency array sets up, can effectively improve the convergence of this first high frequency radiating element directional diagram.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is an exploded view of a low frequency radiation unit provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an embodiment of a MIMO antenna provided by the present invention;
fig. 3 is a schematic structural diagram of another embodiment of the MIMO antenna provided by the present invention.
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 by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
It will be understood by those within the art that, unless expressly stated otherwise, the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
Fig. 1 to fig. 3 collectively illustrate the low frequency radiating element provided in the embodiments of the present invention, which is used for radiating and receiving communication signals on the reflecting plate of the mounting antenna, and has good electrical performance and can reduce the coupling influence between the high and low frequency radiating elements in the antenna.
As shown in fig. 1, the low-frequency radiating element 1 includes a base 11, four baluns 12 connected to the base 11, and four dipoles (not numbered, the same below) respectively supported by the four baluns 12 above the base 11, the four dipoles having the same shape and size and being used for transmitting and receiving communication signals, each dipole including a pair of radiating arms 13 having an included angle.
Specifically, the base 11, the four baluns 12 and the four dipoles form a bowl-shaped structure with the base 11 as a bowl bottom and the four dipoles as a bowl mouth, two adjacent baluns 12 are uniformly arranged at intervals and extend from the bowl bottom to the bowl mouth, and the bowl mouth is shaped like a square.
Preferably, the radiating arm 13 includes a first unit arm 131 connected to the balun 12, a second unit arm 132 connected to the first unit arm 131, and a vertical arm 133 bent and extended upward along an outer side of the second unit arm 132, the second unit arm 132 being extended in a direction close to the adjacent radiation arm 13 of the dipole adjacent thereto, and the outer edge of the second unit arm 132 is recessed with respect to the first unit arm 131, namely, the aperture of the figure formed by the sequential enclosure of the outer end of each first unit arm 131 in the four dipoles is larger than the aperture of the figure formed by the sequential enclosure of each second unit arm 132, on the premise of not reducing the caliber of the low-frequency radiation unit 1, the relative distance between the second unit arm 132 and another adjacent radiation unit can be increased, so that the coupling influence between the two radiation units is reduced.
Secondly, since the second unit arm 132 is concave, the radiation area thereof is reduced, which causes deterioration of the S-parameter and the directional pattern of the low frequency radiation unit 1. In this case, by providing the vertical arm 133 corresponding to lengthening the second unit arm 132, the bandwidth of the low-frequency radiating unit 1 can be effectively increased, the convergence of the S-parameter and the directivity pattern can be improved, and the electrical performance of the low-frequency radiating unit 1 can be ensured to be good.
Preferably, the low-frequency radiating unit 1 further includes a dielectric assembly 14 having two ends respectively connected to two adjacent radiating arms 13 in two adjacent dipoles, where the dielectric assembly 14 includes an insulating dielectric clip 141, a clamping groove 1411 is disposed at a lower end of the insulating dielectric clip 141, and the insulating dielectric clip 141 is inserted into the vertical arm 133 through the clamping groove 1411. The resonant length of the radiating arm 13 and the height of the balun 12 can be equivalently increased by the dielectric constant of the insulating dielectric clip 14, so that the directional pattern, standing wave and isolation of the low-frequency radiating unit 1 can be effectively improved, and the insulating dielectric clip 14 can also play a role in fixing the following coupling sheet 142.
Furthermore, a limiting notch 1331 is formed in the vertical arm 133, a limiting structure (not shown) capable of being matched with the limiting notch 1331 is disposed in the slot 1411 of the insulating medium clip 1411, and the insulating medium clip 141 can be positioned and fixed relative to the vertical arm 133 through the limiting effect of the limiting structure and the limiting notch 1331 when being inserted into the vertical arm 133.
Preferably, the dielectric assembly 14 further includes a coupling tab 142 disposed on the insulating dielectric clip 141 and insulated from the radiating arm 13 by the insulating dielectric clip 141, the coupling tab 142 is provided with a riveting hole 1421, and the coupling tab 142 can be riveted and fixed to the insulating dielectric clip 141 by passing through the riveting hole 1421 through an insulating rivet (not shown, the same applies below). The convergence of the S parameter of the low frequency radiating element 1 can be effectively improved by the coupling plate 142, and the deterioration of the S parameter caused by the concave design of the second element arm 132 can be further overcome.
It should be understood that the insulating rivet is a fixing member made of plastic or other insulating materials, and the coupling plate 142 is fixed by riveting, so that the coupling plate 142 is ensured not to be loosened or even fall off, and the performance and parameters of the low-frequency radiating unit 1 are prevented from being affected by the loosening of the coupling plate 142. However, in other embodiments, the coupling tab 142 may also be connected to the insulating medium clamp 141 by other means, for example, the coupling tab 142 is directly inserted into a predetermined slot of the insulating medium clamp 141 and is in interference fit with the slot.
The dielectric assembly 14 further includes an insulating sheet 143, the insulating sheet 143 and the coupling sheet 142 are stacked and riveted on the insulating dielectric clip 141 synchronously with the coupling sheet 142, the material and thickness of the insulating sheet 143 can be adjusted as needed, so that parameters such as a pattern, standing waves and isolation of the low frequency radiating unit 1 can be finely adjusted by the dielectric constant of the insulating sheet 143, and better performance can be achieved, and the insulating sheet 143 can also play a role in strengthening and fixing the coupling sheet 142, so that the coupling sheet 142 is clamped between the insulating sheet 143 and the insulating dielectric clip 141, and further the looseness of the coupling sheet 142 is avoided.
Preferably, the radiating arm 13 further includes a lower radiating surface 134 extending along the inner side of the second unit arm 132 and bending downward, and the bandwidth, the boundary and the isolation of the low frequency radiating unit 1 can be increased by the lower radiating surface 134.
Preferably, the balun 12 and the radiating arms 13 can be manufactured by a die casting process, and have simple manufacturing and high structural strength, and two adjacent radiating arms 13 in two adjacent dipoles can be integrally formed first, and then a gap 135 is formed between the two radiating arms 13 to separate them to form the two radiating arms 13.
As shown in fig. 2, as a second aspect, the present invention further relates to a MIMO antenna 1000, which includes a low frequency array 100, a first high frequency array 200, and a second high frequency array 300, and a reflection plate 400 for arranging the low frequency array 100, the first high frequency array 200, and the second high frequency array 300. The first high frequency array 200 is disposed coaxially with the low frequency array 100, the second high frequency array 300 is disposed in two rows, which are disposed on two sides of the low frequency array 100 and are disposed on the reflection plate 400 side by side with the low frequency array 100, and the low frequency array 100 includes a plurality of the low frequency radiation units 1 arranged on the reflection plate 400 along the length direction of the reflection plate 400.
The first high-frequency array 200 includes a plurality of first high-frequency radiating elements 2, the first high-frequency radiating elements 2 are nested in the low-frequency radiating elements 1 or are disposed between two adjacent low-frequency radiating elements 1, and the specific number of the first high-frequency radiating elements 2 between two adjacent low-frequency radiating elements 1 can be adjusted according to actual requirements, and can be set as one or more. By nesting the apertures of the low-frequency radiating elements 1 or arranging the first high-frequency radiating element 2 in the gap between two adjacent low-frequency radiating elements 1, the empty space in the low-frequency array 1 can be fully utilized, the number of high-frequency radiating elements is increased under the condition that the installation area of the reflecting plate 100 is not increased, and the gain of the high-frequency array in the MIMO antenna 1000 is improved.
The second high frequency array 300 includes a second high frequency radiating element 3 and a third high frequency radiating element 4, which are arranged, with respect to the low frequency radiating element 1 in the low frequency array 100 adjacent to the second high frequency array 300, the second high-frequency radiation unit 3 is over against the low-frequency radiation unit 1, the third high-frequency radiation unit 4 is over against the gap between two adjacent low-frequency radiation units 1, and the projection of the second high-frequency radiation unit 3 in the low-frequency array 100 is located in the range of the radiation arm 13 of the low-frequency radiation unit 1 opposite to the projection, the projection of the third high frequency radiation unit 4 in the low frequency array 100 is located in the gap between two adjacent low frequency radiation units 1, by avoiding the sensitive positions of the second and third high-frequency radiating units to the adjacent low-frequency radiating units 1, the coupling influence between the high-frequency radiating units and the low-frequency radiating units can be reduced.
Preferably, in the second high frequency array 300 and the low frequency array 100 adjacent to the second high frequency array 300, the horizontal distance between the second high frequency radiating element 3 and the low frequency array 100 is greater than the horizontal distance between the third high frequency radiating element 4 and the low frequency array 100, that is, the second high frequency radiating element 3 facing the low frequency radiating element 1 is relatively far away from the low frequency array 100, so that the influence of the coupling of the low frequency radiating element 1 on the second high frequency array 300 is reduced, and the convergence of the directional diagram of the second high frequency array 300 is effectively improved.
Secondly, because the horizontal distances between the second and third high-frequency radiating elements and the low-frequency array 1 are different, the second high-frequency radiating element 3 and the third high-frequency radiating element 4 are arranged alternately and in a staggered manner along the longitudinal direction of the reflector 400, and the distance between the high-frequency radiating elements in the same second high-frequency array 300 or adjacent second high-frequency arrays 300 can be increased, so that the coupling influence between the high-frequency radiating elements is reduced, and the convergence of a high-frequency directional diagram is further improved.
It should be noted that, because the second unit arm 132 of the low-frequency radiating unit 1 is in the concave structure, the second unit arm 132 can be far away from the high-frequency radiating unit adjacent to the low-frequency radiating unit 1 as far as possible without reducing the caliber of the low-frequency radiating unit 1, so that the coupling influence between the low-frequency radiating unit 1 and the high-frequency radiating unit adjacent to the low-frequency radiating unit 1 is reduced, and the coupling influence between the low-frequency radiating unit 1 and the first high-frequency radiating unit 2 coaxially nested with the low-frequency radiating unit 1 is not increased, thereby reducing the distance between the high-frequency radiating unit and the low-frequency radiating unit and realizing the miniaturization of the antenna.
Preferably, the heights of the reflective plates 400 at the positions of the low frequency array 100 and the second high frequency array 300 are different. The reflection plate 400 may be bent to form a recess and a protrusion, the protrusion is higher than the recess, the low frequency array 100 and the first high frequency array 200 are both disposed in the recess, and the second high frequency array 300 is disposed in the protrusion, so that the second and third high frequency radiation units are improved without increasing the horizontal distance between the low frequency array 100 and the second high frequency array 300, the high frequency radiation performance and the circuit index of the second high frequency array 300 are effectively improved, the coupling effect between the second high frequency array 300 and the low frequency array 100 is reduced, and the size of the MIMO antenna 1000 may be further reduced.
As shown in fig. 3, in another embodiment, the MIMO antenna 1000 may include two columns of the low frequency arrays 100 respectively disposed at both ends of the reflector 400 in the width direction, two columns of the first high frequency arrays 200 respectively disposed coaxially with the two columns of the low frequency arrays 100, and two columns of the second high frequency arrays 300 disposed side by side between the two columns of the low frequency arrays 100.
Preferably, the low-frequency oscillators 1 in the two columns of low-frequency arrays 100 located at the left and right ends of the reflection plate 400 are arranged along the longitudinal direction of the reflection plate 400 in a staggered manner, that is, the low-frequency oscillators 1 in the two columns of low-frequency arrays 100 have a distance along the longitudinal direction of the reflection plate 400, and the coupling influence between the low-frequency oscillators 1 in the two columns of low-frequency arrays 100 is reduced by the staggered arrangement. Secondly, because two columns of second high-frequency arrays 300 are arranged between two columns of low-frequency arrays 100, the low-frequency arrays 100 and the second high-frequency arrays 300 adjacent to the low-frequency arrays are arranged in a staggered mode relative to the other low-frequency arrays 100 and the second high-frequency arrays 300 adjacent to the low-frequency arrays, so that coupling influence between adjacent high-frequency and low-frequency and circuit indexes such as directional diagrams and array separation degrees can be reduced.
It should be understood that, in other embodiments, the number and arrangement of the low frequency arrays 100, the first high frequency arrays 200 and the second high frequency arrays 300 are not particularly limited, for example, the second high frequency arrays 300 are further provided at the left and right ends of the reflection plate 400, or two low frequency arrays 100, two first high frequency arrays 200 and two second high frequency arrays 300 having the same arrangement structure as described above are further provided side by side at the left and right ends of the reflection plate 400. In addition, the specific number of the high-frequency oscillators and the low-frequency oscillators 1 in each array can be set according to actual requirements.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A low-frequency radiating element comprises a base, four baluns connected with the base and four dipoles supported above the base by the four baluns respectively, wherein each dipole comprises a pair of radiating arms, and the radiating arms comprise a first element arm, a second element arm and a vertical arm, the first element arm is connected with the baluns, the second element arm is connected with the first element arm, the second element arm extends and is arranged along the direction close to the adjacent radiating arm in the dipole adjacent to the second element arm, the outer edge of the second element arm is arranged relative to the first element arm in a concave manner, and the outer side of the second element arm is bent upwards to form the vertical arm.
2. The low-frequency radiating element according to claim 1, further comprising a dielectric member having two ends respectively connected to two adjacent radiating arms of two adjacent dipoles.
3. The low frequency radiating element of claim 2, wherein the dielectric assembly comprises an insulating dielectric clip provided with a slot, the slot being plugged into the vertical arm.
4. The low frequency radiating element of claim 3, wherein the dielectric assembly further comprises a coupling tab disposed on the dielectric clip and insulated from the radiating arm by the dielectric clip.
5. The low-frequency radiating element according to claim 4, wherein the coupling plate has a riveting hole formed therein, and the coupling plate can be riveted and fixed to the insulating dielectric clip by an insulating rivet passing through the riveting hole.
6. The low frequency radiating element of claim 1, wherein the radiating arm further comprises a lower radiating surface extending in a downward bending manner along an inner side of the second element arm.
7. A MIMO antenna comprising a reflector plate, at least one high frequency array and at least one low frequency array both disposed on the reflector plate, wherein the high frequency array comprises at least one high frequency radiating element, and the low frequency array comprises at least one low frequency radiating element, and wherein the low frequency radiating element is the low frequency radiating element of any one of claims 1 to 6.
8. The MIMO antenna of claim 7, wherein the high frequency array comprises a first high frequency array disposed on the reflector plate and coaxially disposed with the low frequency array, and the first high frequency array comprises a first high frequency radiating element nested within the low frequency radiating element and/or disposed between two adjacent low frequency radiating elements.
9. The MIMO antenna of claim 7, wherein the high-frequency array includes a second high-frequency array disposed on the reflector plate side by side with the low-frequency array, and in the second high-frequency array and the low-frequency array adjacent to the second high-frequency array, the high-frequency radiating elements of the second high-frequency array include a second high-frequency radiating element and a third high-frequency radiating element, a projection of the second high-frequency radiating element in the low-frequency array is located within a range of a radiating arm of the low-frequency radiating element directly opposite to the second high-frequency radiating element, and a projection of the third high-frequency radiating element in the low-frequency array is located in a gap between two low-frequency radiating elements adjacent to the third high-frequency radiating element.
10. The MIMO antenna of claim 9, wherein the horizontal spacing between the second high frequency radiating element and the low frequency array adjacent thereto is greater than the horizontal spacing between the third high frequency radiating element and the low frequency array adjacent thereto.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922441660.4U CN210926309U (en) | 2019-12-27 | 2019-12-27 | Low-frequency radiation unit and MIMO antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922441660.4U CN210926309U (en) | 2019-12-27 | 2019-12-27 | Low-frequency radiation unit and MIMO antenna |
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| CN210926309U true CN210926309U (en) | 2020-07-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113629396A (en) * | 2021-08-10 | 2021-11-09 | 苏州纬度天线有限公司 | Low-profile radiation unit capable of improving gain and front-to-back ratio |
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2019
- 2019-12-27 CN CN201922441660.4U patent/CN210926309U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113629396A (en) * | 2021-08-10 | 2021-11-09 | 苏州纬度天线有限公司 | Low-profile radiation unit capable of improving gain and front-to-back ratio |
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Granted publication date: 20200703 Termination date: 20211227 |