High and low frequency signal transmitting and receiving device

Abstract

The utility model relates to a high and low frequency signal transmitting and receiving device, which comprises a low frequency antenna, a high frequency antenna, a decoupling branch knot and a reflecting plate, and is characterized in that the low frequency antenna and the high frequency antenna are arranged on the reflecting plate and are positioned on the same surface side of the reflecting plate; the orthographic projection of the high-frequency antenna on the reflecting plate is partially overlapped with the orthographic projection of the low-frequency antenna on the reflecting plate, the decoupling branch knot comprises a first bending section and a second bending section, one end of the second bending section is connected with one end of the first bending section, and the other end of the second bending section is connected with the other end of the second bending section. The other end of the first bending section is connected with the low-frequency antenna, and the first bending section is obliquely arranged relative to the second bending section.

Description

Technical Field

[0001] The utility model relates to the field of antennas, in particular to a high- and low-frequency signal transceiver. Background Art

[0002] At present, mobile communication systems use array antennas as wireless base stations to receive and transmit radio frequency signals. In order to reduce the size of the array antenna, the column spacing of the antenna will be reduced, resulting in poor antenna isolation, poor beam width convergence, directional pattern distortion, reduced array gain and other problems. Utility Model Content

[0003] Based on this, it is necessary to provide a high and low frequency signal transceiver to address the problem of poor isolation after the antenna spacing is reduced.

[0004] A high- and low-frequency signal transceiver, comprising a low-frequency antenna, a high-frequency antenna, a decoupling branch and a reflector, wherein the low-frequency antenna and the high-frequency antenna are both mounted on the reflector and are located on the same side of the reflector, the orthographic projection of the high-frequency antenna on the reflector partially overlaps with the orthographic projection of the low-frequency antenna on the reflector, the decoupling branch comprises a first bending section and a second bending section, one end of the second bending section is connected to one end of the first bending section, the other end of the first bending section is connected to the low-frequency antenna, and the first bending section is inclined relative to the second bending section.

[0005] The high and low frequency signal transceiver of the utility model further comprises a balun structure, the two ends of which are respectively arranged on the low frequency antenna and the reflector plate, so that the distance between the low frequency antenna and the reflector plate is greater than the distance between the high frequency antenna and the reflector plate.

[0006] The low-frequency antenna of the utility model comprises a plurality of radiating arms arranged in a rectangular array, wherein the radiating arms comprise at least four strip lines, and each of the strip lines is provided with the decoupling branch.

[0007] The decoupling branch of the utility model further comprises a third bending section, the end of the second bending section away from the first bending section is connected to one end of the third bending section, and the other end of the third bending section is connected to the strip line.

[0008] In the present invention, the first bending section and the third bending section are parallel to each other and perpendicular to the second bending section, and the length ratio of the first bending section, the second bending section and the third bending section is 1:3:1.

[0009] The second bending section of the utility model is parallel to the belt line, and the second bending section and the corresponding belt line have the same symmetry axis.

[0010] The decoupling branch of the utility model only includes a first bending section and a second bending section, the second bending section is perpendicular to the first bending section, and the length ratio of the second bending section to the first bending section is 2.5:1.

[0011] The strip line of the utility model includes a first radiation segment and a second radiation segment, one end of the first radiation segment is connected to one end of the second radiation segment, the end of the first bending segment is located at the connection between the first radiation segment and the second radiation segment, the first bending segment is perpendicular to the first radiation segment, and the length ratio of the first radiation segment to the second radiation segment is 1:2.

[0012] In the present invention, the second radiation section and the second bending section are located on the same side of the first bending section.

[0013] The low-frequency antenna and the high-frequency antenna of the utility model are both parallel to the reflection plate.

[0014] The beneficial effects of the utility model are:

[0015] After the decoupling effect of the decoupling branch, the vertical distortion problem of the high-frequency antenna is significantly alleviated, and the horizontal plane pattern changes very little. In addition, by adjusting the total length of the decoupling branch, decoupling can be performed for specific frequencies, and the controllability of the decoupling effect is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the high and low frequency signal transceiver in Embodiment 1 of the present utility model;

[0017] Figure 2 This is a schematic diagram of the top view of the high and low frequency signal transceiver in Embodiment 1 of the utility model;

[0018] Figure 3 This is a schematic diagram of the top view of the low-frequency antenna in Embodiment 2 of the present utility model;

[0019] Figure 4 The directional diagram of the high frequency antenna before and after decoupling in Example 1 of the utility model;

[0020] Figure 5 The comparison of the radiation efficiency of the low-frequency antenna radiating high-frequency electromagnetic waves with different lengths of the decoupling branches in Example 1 of the utility model;

[0021] Figure 6 The directional diagram of the high frequency antenna before and after decoupling in Embodiment 2 of the utility model;

[0022] Figure 7 This is a radiation efficiency diagram of the low-frequency antenna in Example 2 of the present utility model.

[0023] Reference numerals:

[0024] 1. Low-frequency antenna; 11. First radiation section; 12. Second radiation section; 2. High-frequency antenna; 3. Decoupling branch; 31. First bending section; 32. Second bending section; 33. Third bending section; 4. Reflector; 5. Balun structure. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0031] Embodiment 1:

[0032] See also Figure 1 and Figure 2 This embodiment provides a high and low frequency signal transceiver device, including a low frequency antenna 1, a high frequency antenna 2, a decoupling branch 3, a reflection plate 4 and a balun structure 5.

[0033] The low-frequency antenna 1 and the high-frequency antenna 2 are both flat and parallel to the reflector 4. In this embodiment, the transceiver frequency band of the low-frequency antenna 1 is 690-960 MHz, and the transceiver frequency band of the high-frequency antenna 2 is 1710-2690 MHz. In some other embodiments, the number of low-frequency antennas 1 and high-frequency antennas 2 can be further increased, and there can be differences in the transceiver frequency bands between different low-frequency antennas 1, and there can also be differences in the transceiver frequency bands between different high-frequency antennas 2. In this embodiment, the number of low-frequency antennas 1 is one, and the number of high-frequency antennas 2 is two.

[0034] The low frequency antenna 1 and the high frequency antenna 2 are located on the same side of the reflector 4. The low frequency antenna 1 and the high frequency antenna 2 are both mounted on the reflector 4 and are spaced apart from the reflector 4.

[0035] In this embodiment, the balun structure 5 is located between the low-frequency antenna 1 and the reflector 4, and the two ends of the balun structure 5 are respectively arranged on the low-frequency antenna 1 and the reflector 4. The low-frequency antenna 1 is installed on the reflector 4 through the balun structure 5 so that the distance between the low-frequency antenna 1 and the reflector 4 is greater than the distance between the high-frequency antenna 2 and the reflector 4.

[0036] The low-frequency antenna 1 and the high-frequency antenna 2 are arranged at an interval, and the low-frequency antenna 1 partially blocks the high-frequency antenna 2, that is, the orthographic projection of the low-frequency antenna 1 on the reflector 4 partially overlaps the orthographic projection of the high-frequency antenna 2 on the reflector 4. As a result, the low-frequency antenna 1 interferes with the signal reception and transmission of the high-frequency antenna 2.

[0037] Similarly, in some other embodiments, the balun structure 5 is located between the high-frequency antenna 2 and the reflector 4, and the distance between the low-frequency antenna 1 and the reflector 4 is smaller than the distance between the high-frequency antenna 2 and the reflector 4, which also causes the high-frequency antenna 2 to interfere with the signal reception and transmission of the low-frequency antenna 1. This is an equivalent solution of this embodiment, so it will not be repeated.

[0038] Consistent with the prior art, the low-frequency antenna 1 includes a radiation dielectric substrate and a plurality of radiation arms arranged on the surface of the radiation dielectric substrate. In this embodiment, there are four radiation arms arranged in a square array, two of which form a pair of half-wave dipoles, and the other two radiation arms form another pair of half-wave dipoles, and each radiation arm includes four strip lines.

[0039] In order to reduce the signal interference of the low-frequency antenna 1 on the high-frequency antenna 2, and also to reduce the signal interference of the high-frequency antenna 2 on the low-frequency antenna 1, a decoupling branch 3 is provided on each strip line of the radiation arm, and the decoupling branch 3 is located on the inner side of the radiation arm. It is not difficult to understand that in order to reduce the coupling effect between the low-frequency antenna 1 and the high-frequency antenna 2, the specific structure of the decoupling branch 3 needs to be designed to a certain extent.

[0040] Based on this, this embodiment provides a specific structure of a decoupling branch 3 to meet the decoupling requirements in this embodiment. Specifically, the decoupling branch 3 only includes a first bending section 31 and a second bending section 32, and the first bending section 31 and the second bending section 32 are both straight and parallel to the reflector 4. One end of the second bending section 32 is connected to one end of the first bending section 31, and the other end of the first bending section 31 is connected to the strip line, and the other end of the second bending section 32 is spaced from the strip line, and the first bending section 31 is inclined relative to the second bending section 32, so the decoupling branch 3 of this embodiment is L-shaped.

[0041] Preferably, the second bending section 32 is perpendicular to the first bending section 31, and the length ratio of the second bending section 32 to the first bending section 31 is 2.5:1. The strip line includes a first radiation section 11 and a second radiation section 12, and the first radiation section 11 and the second radiation section 12 are located on the same straight line. One end of the first radiation section 11 is connected to one end of the second radiation section 12, and the length ratio of the first radiation section 11 to the second radiation section 12 is 1:2. The end of the first bending section 31 is located at the connection between the first radiation section 11 and the second radiation section 12, that is, the end of the first bending section 31 is located at the point where the strip line is divided into three equal parts, and the first bending section 31 is perpendicular to the first radiation section 11. The second radiation section 12 and the second bending section 32 are located on the same side of the first bending section 31. The above structural proportional relationship can effectively change the current distribution of the entire radiation arm, thereby achieving a decoupling effect.

[0042] In this embodiment, the sum of the lengths of the second bending section 32 and the first bending section 31 is the total length L of the decoupling branch 3 , and L is equal to one quarter of the target decoupling wavelength.

[0043] See also Figure 4 Before the high-frequency antenna 2 of this embodiment is decoupled by the decoupling branch 3, the vertical plane radiation pattern shows obvious distortion. After the decoupling of the decoupling branch 3, the vertical plane distortion problem is significantly alleviated, while the horizontal plane radiation pattern does not change significantly, maintaining good consistency.

[0044] See also Figure 5 When the high-frequency electromagnetic wave is radiated to the low-frequency antenna 1, the radiation efficiency under different L values ​​(corresponding to different target decoupling wavelengths) reaches about -62.5dB, which proves that the decoupling branch 3 has a good shielding effect on the high-frequency electromagnetic wave and achieves a good specific frequency decoupling effect.

[0045] Embodiment 2:

[0046] See also Figure 3 The difference between this embodiment and embodiment 1 is that the decoupling branch 3 further includes a third bending section 33. The end of the second bending section 32 away from the first bending section 31 is connected to one end of the third bending section 33, so that the decoupling branch 3 of this embodiment is in a U-shape, and the other end of the third bending section 33 is connected to the strip line.

[0047] Further preferably, the second bend section 32 is parallel to the strip line, and the second bend section 32 and the strip line where it is located have the same symmetry axis, the first bend section 31 and the third bend section 33 are parallel to each other and perpendicular to the second bend section 32, and the length ratio of the first bend section 31, the second bend section 32 and the third bend section 33 is 1:3:1. At this time, the decoupling branch 3 can generate a signal with equal amplitude and antiphase to the coupling signal between the low-frequency antenna and the high-frequency antenna, and the two cancel each other out to reduce coupling.

[0048] See also Figure 6 Similar to Example 1, before the high-frequency antenna 2 of this embodiment is decoupled by the decoupling branch 3, the vertical plane radiation pattern shows obvious distortion. After the decoupling of the decoupling branch 3, the above-mentioned vertical plane distortion problem is significantly alleviated, while the horizontal plane radiation pattern does not undergo obvious changes, maintaining good consistency.

[0049] See also Figure 7 When the high-frequency electromagnetic wave is radiated to the low-frequency antenna 1, the radiation efficiency of the low-frequency antenna 1 reaches about -56dB, indicating that the decoupling branch 3 of this embodiment has a good shielding effect on the high-frequency electromagnetic wave and achieves a good decoupling effect.

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A high and low frequency signal transceiver, characterized in that: The invention comprises a low-frequency antenna (1), a high-frequency antenna (2), a decoupling branch (3) and a reflector (4), wherein the low-frequency antenna (1) and the high-frequency antenna (2) are both mounted on the reflector (4) and are located on the same side of the reflector (4), and the orthographic projection of the high-frequency antenna (2) on the reflector (4) partially overlaps the orthographic projection of the low-frequency antenna (1) on the reflector (4); The decoupling branch (3) comprises a first bending section (31) and a second bending section (32), one end of the second bending section (32) being connected to one end of the first bending section (31), the other end of the first bending section (31) being connected to the low-frequency antenna (1), and the first bending section (31) being arranged obliquely with respect to the second bending section (32).

2. The high and low frequency signal transceiver according to claim 1, characterized in that: The high- and low-frequency signal transceiver further comprises a balun structure (5), wherein two ends of the balun structure (5) are respectively arranged on the low-frequency antenna (1) and the reflector (4), so that the distance between the low-frequency antenna (1) and the reflector (4) is greater than the distance between the high-frequency antenna (2) and the reflector (4).

3. The high and low frequency signal transceiver according to claim 2, characterized in that: The low-frequency antenna (1) comprises a plurality of radiating arms arranged in a rectangular array, the radiating arms comprising at least four strip lines, and each of the strip lines is provided with the decoupling branch (3).

4. The high and low frequency signal transceiver according to claim 3, characterized in that: The decoupling branch (3) further comprises a third bending section (33), the end of the second bending section (32) facing away from the first bending section (31) is connected to one end of the third bending section (33), and the other end of the third bending section (33) is connected to the strip line.

5. The high and low frequency signal transceiver according to claim 4, characterized in that: The first bending section (31) and the third bending section (33) are parallel to each other and perpendicular to the second bending section (32); the length ratio of the first bending section (31), the second bending section (32) and the third bending section (33) is 1:3:

1.

6. The high and low frequency signal transceiver according to claim 5, characterized in that: The second bending section (32) is parallel to the strip line, and the second bending section (32) and the corresponding strip line have the same symmetry axis.

7. The high and low frequency signal transceiver according to claim 3, characterized in that: The decoupling branch (3) comprises only a first bending section (31) and a second bending section (32), the second bending section (32) being perpendicular to the first bending section (31), and the length ratio of the second bending section (32) to the first bending section (31) being 2.5:

1.

8. The high and low frequency signal transceiver according to claim 7, characterized in that: The strip line comprises a first radiating section (11) and a second radiating section (12); one end of the first radiating section (11) is connected to one end of the second radiating section (12); an end of the first bending section (31) is located at the connection between the first radiating section (11) and the second radiating section (12); the first bending section (31) is perpendicular to the first radiating section (11); and a length ratio between the first radiating section (11) and the second radiating section (12) is 1:

2.

9. The high and low frequency signal transceiver according to claim 8, characterized in that: The second radiating section (12) and the second bending section (32) are located on the same side of the first bending section (31).

10. The high and low frequency signal transceiver according to any one of claims 1 to 9, characterized in that: The low-frequency antenna (1) and the high-frequency antenna (2) are both parallel to the reflection plate (4).

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