Dual-polarization low-frequency oscillator unit based on coupled feeding and antenna

Abstract

The invention relates to the technical field of mobile communication, in particular to a dual-polarization low-frequency oscillator unit and antenna based on coupled feeding, which comprises a radiation part and a feeding part, the radiation part comprises four radiation arms, the four radiation arms are symmetrically arranged in a cross manner, and two radiation arms on a diagonal form a pair of radiation groups, the four radiation arms jointly form two pairs of radiation groups, the two pairs of radiation groups are used for generating radiation of different polarizations, a PCB coupling plate is arranged at the top of the feed part, four feed metal sheets are integrated on one side face of the PCB coupling plate, and the four feed metal sheets are arranged on the other side face of the PCB coupling plate. The PCB coupling plate and the radiation part are pressed and fixed, and the four feed metal sheets and the four radiation arms are coupled and fed in a one-to-one correspondence manner; compared with a traditional PCB radiating surface and a metal plate radiating surface needing to be electroplated, the material cost is obviously saved, a traditional feeding scheme with welding spots is replaced with coupled feeding, and the problem that the whole machine intermodulation is unstable due to the welding spots of the traditional radiating surface is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of mobile communications, and in particular to a dual-polarization low-frequency oscillator unit and an antenna based on coupled feeding. Background Art

[0002] With the rapid development of the mobile communications industry, the coexistence of 4G and 5G networks has become a common phenomenon. The co-site sharing of multi-standard mobile communication networks requires base station antennas to have systems with different frequency bands, including 690-960MHz, 1695-2690MHz or 1427-2690MHz and 3300-3800MHz. The radiating units of different frequency bands are located in the same outer cover. In order to keep the mutual interference at a low level, the low-frequency radiating units of 690-960MHz need to have a good intermodulation level. At present, low-frequency oscillators generally adopt different forms of design such as die-casting, sheet metal or PCB. All of them require the radiator to be electroplated and welded, which has high requirements for processing technology and welding technology. In addition, the structure of electroplating and welding the radiator is prone to cause the problem of unstable low-frequency intermodulation of the whole machine. Summary of the invention

[0003] The purpose of the present invention is to propose a dual-polarization low-frequency oscillator unit based on coupled feeding, in which the radiating arm is a sheet metal radiating surface that does not require electroplating and has no welding points, and can improve the intermodulation level of the low-frequency system. To achieve the purpose of the present invention, the following technical solutions are adopted:

[0004] The first aspect of the present invention proposes a dual-polarization low-frequency oscillator unit based on coupled feeding, comprising a radiating part and a feeding part, wherein the radiating part comprises four radiating arms, wherein the four radiating arms are symmetrically arranged in a cross shape, and the two radiating arms on the diagonal line form a pair of radiating groups, and the four radiating arms form two pairs of radiating groups in total, and the two pairs of radiating groups are used to generate radiation of different polarizations, and a PCB coupling plate is provided on the top of the feeding part, and four feeding metal sheets are integrated on one side surface of the PCB coupling plate, the PCB coupling plate is pressed and fixed to the radiating part, and the four feeding metal sheets are coupled and fed one-to-one with the four radiating arms.

[0005] A further improvement is that four metal connecting plates are integrated on the other side of the PCB coupling plate, and the metal connecting plates are used to be directly electrically connected to the feeding part. The positions of the four metal connecting plates and the four feeding metal plates correspond one to one and are electrically connected through metallized vias.

[0006] A further improvement is that the feeding part includes a feeding circuit board, the top of which is vertically plugged into the PCB coupling board, and a first feeding circuit corresponding to one of the polarizations and a second feeding circuit corresponding to the other polarization are provided on the feeding circuit board, and the first feeding circuit and the second feeding circuit are respectively electrically connected to the corresponding metal connecting sheets.

[0007] A further improvement is that the feeding part includes a first circuit board and a second circuit board which are orthogonally connected to each other, the tops of the first circuit board and the second circuit board are vertically plugged into the PCB coupling board, the first circuit board is provided with a first feeding circuit corresponding to one of the polarizations, and the second circuit board is provided with a second feeding circuit corresponding to the other polarization, and the first feeding circuit and the second feeding circuit are respectively electrically connected to the corresponding metal connecting sheets.

[0008] A further improvement is that the first feeding circuit includes a first feeding signal layer and a first ground layer, and the second feeding circuit includes a second feeding signal layer and a second ground layer.

[0009] A further improvement is that the radiation arm is a ring-shaped sheet metal radiation arm.

[0010] A further improvement is that the PCB coupling plate is coated with green oil to achieve insulation isolation between the coupling metal sheet and the radiation arm.

[0011] A further improvement is that the PCB coupling plate and the four radiating arms of the radiating part are pressed and fixed by insulating rivets or by clamping parts after being tightly attached to each other.

[0012] A further improvement is that a plurality of protruding coupling branches are provided on the radiation arm to offset the high-frequency radiation current of the high-frequency oscillator induced on the low-frequency oscillator, thereby reducing the deterioration effect of the secondary radiation of the low-frequency oscillator on the high-frequency performance.

[0013] A second aspect of the present invention provides an antenna, comprising a reflector and a dual-polarization low-frequency dipole unit based on coupling feeding as described in any one of the first aspects, wherein the dual-polarization low-frequency dipole unit based on coupling feeding is arranged on the reflector.

[0014] The beneficial effects of the present invention are:

[0015] The present invention arranges that the PCB coupling plate and the radiating part are connected by a press-fitting manner and the four feeding metal sheets correspond to the four radiating arms one by one, so that the surface of the sheet metal radiating arm can be coupled and fed with the feeding metal sheet on the PCB coupling plate without electroplating treatment, thereby realizing the feeding of the radiating part by the feeding part. Compared with the traditional PCB radiating surface and the sheet metal radiating surface that needs electroplating, the material cost is significantly saved. In addition, the present invention replaces the traditional feeding scheme with solder points with coupling feeding, thereby solving the problem that the solder points of the traditional radiating surface are prone to cause instability in intermodulation of the whole machine.

[0016] The present invention integrates four feeding metal sheets on one side of the PCB coupling board. Since a layer of insulating green oil is attached to the circuit layer of the PCB coupling board itself, it can avoid adding additional insulating isolation sheets at the coupling connection and other complicated assembly processes, thereby ensuring the convenience and stability of the vibrator unit assembly. In addition, in terms of the flatness of the contact surface at the coupling connection, the PCB coupling board has a flatness that cannot be achieved by integrated die-casting or sheet metal coupling boards, and can better ensure the consistency of the coupling feeding performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a dual-polarization low-frequency oscillator unit based on coupled feeding in Embodiment 1 of the present invention;

[0018] Figure 2 This is a schematic diagram of the side structure of a feeding circuit board in Embodiment 1 of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of another side of the feeding circuit board in the first embodiment of the present invention;

[0020] Figure 4 This is a front schematic diagram of the connection structure between the PCB coupling plate and the sheet metal radiation surface in the present invention;

[0021] Figure 5 It is a schematic diagram of the front structure of the PCB coupling plate in the present invention;

[0022] Figure 6 It is a schematic diagram of the back side of the connection structure between the PCB coupling plate and the sheet metal radiation surface in the present invention;

[0023] Figure 7 It is a schematic diagram of the back structure of the PCB coupling plate in the present invention;

[0024] Figure 8 It is a schematic diagram of the structure of a dual-polarized low-frequency oscillator unit in a high-low frequency array antenna (the radiating arm is provided with a coupling branch);

[0025] Fig. 9 A schematic diagram of the structure of a dual-polarized low-frequency oscillator unit in a high-low frequency array antenna (coupling branches and Figure 8 The coupling branch structure in is different);

[0026] Fig.10 It is a schematic diagram of the overall structure of a dual-polarization low-frequency oscillator unit based on coupled feeding in the second embodiment;

[0027] Fig.11 It is a schematic diagram of the structure of a dual-polarized low-frequency oscillator unit in a high-low frequency array antenna (the feeding part includes a first circuit board and a second circuit board that are orthogonally connected to each other);

[0028] Fig.12 A schematic diagram of the structure of a dual-polarized low-frequency oscillator unit in a high-low frequency array antenna (coupling branches and Fig.11 The coupling branch structure is different in the example above).

[0029] Description of reference numerals:

[0030] 11. Sheet metal radiation surface; 111. Radiation arm; 120. PCB coupling plate; 121. Metal connecting plate; 122. Feed metal plate; 130. Feed circuit board; 131. Metal conductive plate; 132. Small metal plate; 133. Second metal plate; 134. Large metal plate; 135. First metal plate; 140. PCB base; 150. First circuit board; 151. Second circuit board; 160. Coupling branch. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0032] It should be noted that when an element is referred to as being "fixed to", "disposed on", "fixed on" or "installed 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. Furthermore, when an element is considered to be "transmission-connected" to another element, the two can achieve power transmission, and its specific implementation method can be implemented using the existing technology, which will not be repeated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is vertical, but due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only and do not represent the only implementation method.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] The “first” and “second” involved in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0035] Embodiment 1:

[0036] Please refer to the attached Figure 1 -Attached Figure 7 , Embodiment 1 of the present invention proposes a dual-polarization low-frequency oscillator unit based on coupled feeding, the dual-polarization low-frequency oscillator unit includes a radiating part and a feeding part, the radiating part includes four radiating arms 111, the radiating arm 111 is an annular sheet metal radiating arm 111, the four annular sheet metal radiating arms 111 constitute a sheet metal radiating surface 11, the four radiating arms 111 are cross-symmetrically arranged, and the two radiating arms 111 on the diagonal line form a pair of radiating groups, the four radiating arms 111 form two pairs of radiating groups in total, the two pairs of radiating groups are used to generate radiation of different polarizations, a PCB coupling plate 120 is provided on the top of the feeding part, four feeding metal sheets 122 are integrated on one side surface of the PCB coupling plate 120, the PCB coupling plate 120 and the radiating part are pressed and fixed, and the four feeding metal sheets 122 and the four radiating arms 111 are coupled and fed one-to-one.

[0037] It can be understood that the present invention connects the PCB coupling plate 120 and the radiating part by means of pressing and fixing, and the four feeding metal sheets 122 correspond to the four radiating arms 111 one by one, so that the surface of the sheet metal radiating arm 111 can be coupled and fed with the feeding metal sheet 122 on the PCB coupling plate 120 without electroplating treatment, thereby realizing the feeding of the radiating part by the feeding part.

[0038] In this embodiment, green oil is coated on the PCB coupling plate 120 to achieve insulation isolation between the coupling metal sheet 122 and the radiation arm 111 .

[0039] It can be understood that since the PCB coupling plate 120 itself is coated with green oil, the green oil can play a role of insulation and isolation, so that the feeding metal plate 122 has no direct contact with the radiation arm 111, so there is no need to place an insulating isolation plate between the PCB coupling plate 120 and the radiation arm 111 for isolation.

[0040] The present invention adopts a sheet metal radiating surface 11 that does not require electroplating, which significantly saves material costs compared to traditional PCB radiating surfaces and sheet metal radiating surfaces 11 that require electroplating. In addition, the present invention replaces the traditional feeding solution with solder points with coupled feeding, thereby solving the problem that traditional radiating surface solder points are prone to cause intermodulation instability of the entire machine.

[0041] The present invention integrates four feeding metal sheets 122 on one side of the PCB coupling plate 120. Since a layer of insulating green oil is attached to the circuit layer of the PCB coupling plate 120 itself, it can avoid adding additional insulating isolation sheets at the coupling connection and other complicated assembly processes, thereby ensuring the convenience and stability of the vibrator unit assembly. In addition, in terms of the flatness of the contact surface at the coupling connection, the PCB coupling plate 120 has a flatness that cannot be achieved by an integrated die-cast or sheet metal coupling plate, and can better ensure the consistency of the coupling feeding performance.

[0042] In this embodiment, four metal connecting plates 121 are integrated on the other side of the PCB coupling plate 120. The metal connecting plates 121 are used to be directly electrically connected to the feeding part. The positions of the four metal connecting plates 121 and the four feeding metal plates 122 correspond one to one and are electrically connected through metallized vias.

[0043] In this embodiment, the feeding part includes a feeding circuit board 130, the top of the feeding circuit board 130 is vertically plugged into the via hole of the PCB coupling plate 120, and the bottom of the feeding circuit board 130 is vertically plugged into the PCB base 140. A first feeding circuit corresponding to one of the polarizations (i.e., the first polarization) and a second feeding circuit corresponding to the other polarization (i.e., the second polarization) are provided on the feeding circuit board 130, and the first feeding circuit and the second feeding circuit are respectively electrically connected to the corresponding metal connecting sheet 121.

[0044] Specifically, the first feeding circuit includes a first feeding signal layer and a first ground layer, and the second feeding circuit includes a second feeding signal layer and a second ground layer.

[0045] It is understandable that the present invention arranges the first feeding circuit and the second feeding circuit on the same feeding circuit board 130 to realize the feeding of the two polarizations of the oscillator. Figure 2 and Figure 3As shown, the metal conductive sheet 131 on one side of the feed circuit board 130 serves as the first feed signal layer corresponding to the first polarization, and the first metal sheet 135 on the other side of the feed circuit board 130 serves as the first grounding layer corresponding to the first polarization; the second metal sheet 133 on one side of the feed circuit board 130 serves as the second grounding layer corresponding to the second polarization; the second feed signal layer corresponding to the second polarization is divided into two parts, wherein the small metal sheet 132 located above the second metal sheet 133 is a small part, and the rest is mostly a large metal sheet 134 located on the other side of the feed circuit board 130, and the small metal sheet 132 and the large metal sheet 134 are directly electrically connected through the metallized vias provided on the feed circuit board 130. That is, most of the second feed signal layer corresponding to the second polarization and the first feed signal layer corresponding to the first polarization are distributed on different sides of the feed circuit board 130. This method of providing two polarization feed circuits on both sides of the same feed circuit board 130 enhances the polarization isolation of the low-frequency oscillator and improves the network performance of the whole machine.

[0046] like Figure 5 As shown, the sheet metal radiation surface 11 is pressed onto the bottom of the PCB coupling plate 120, and the feeding metal sheet 122 on the back of the PCB coupling plate 120 forms a coupling feed with the sheet metal radiation surface 11. The PCB coupling plate 120 itself is coated with green oil, so there is no need to place an insulating isolation sheet or other isolation components between the sheet metal radiation arm 111 and the PCB coupling plate 120.

[0047] In this embodiment, the PCB coupling plate 120 and the four radiating arms 111 of the radiating portion are pressed and fixed by insulating rivets or by clamping parts.

[0048] The PCB coupling plate 120 and the corresponding positions on the four radiation arms 111 of the radiation part are provided with connection holes for press-fitting and fixing with rivets.

[0049] Embodiment 2:

[0050] The second embodiment of the present invention proposes a dual-polarization low-frequency oscillator unit based on coupled feeding, which has a substantially same structure as the low-frequency oscillator unit in the first embodiment, and differs from the first embodiment in that: Fig.10 As shown, the feeding part includes a first circuit board 150 and a second circuit board 151 which are orthogonally connected to each other. The tops of the first circuit board 150 and the second circuit board 151 are vertically plugged into the PCB coupling board 120. The first circuit board 150 is provided with a first feeding circuit corresponding to one of the polarizations, and the second circuit board 151 is provided with a second feeding circuit corresponding to the other polarization. The first feeding circuit and the second feeding circuit are electrically connected to the corresponding metal connecting sheet 121, respectively.

[0051] Specifically, the first feed circuit includes a first feed signal layer and a first ground layer, and the second feed circuit includes a second feed signal layer and a second ground layer. The first feed signal layer and the first ground layer are respectively arranged on two sides of the first circuit board 150, and the second feed signal layer and the second ground layer are respectively arranged on two sides of the second circuit board 151.

[0052] In this embodiment, if Fig.11 and Fig.12 As shown, the radiation arm 111 is also provided with a plurality of protruding coupling branches 160 for offsetting the high-frequency radiation current of the high-frequency oscillator induced on the low-frequency oscillator, thereby reducing the deterioration effect of the secondary radiation of the low-frequency oscillator on the high-frequency performance.

[0053] In the first embodiment, the four annular radiation arms 111 are not provided with coupling branches 160, which is applied to a pure low-frequency base station antenna. In the present embodiment, the radiation arm 111 is provided with a plurality of protruding coupling branches 160, which is applied to a high-frequency and low-frequency fusion base station antenna. Fig.11 The coupling branches 160 on the middle annular radiation arm 111 are a plurality of L-bent metal coupling branches 160 of different sizes. Fig.12 The branches on the middle annular radiation arm 111 are a plurality of coupling branches 160 which are a combination of bent shapes and straight lines. The coupling structure formed by these branches can effectively offset the high-frequency radiation current of the high-frequency oscillator induced on the low-frequency oscillator, thereby reducing the deterioration of the high-frequency performance caused by the secondary radiation of the low-frequency oscillator.

[0054] Embodiment three:

[0055] Embodiment 3 of the present invention provides an antenna, such as Figure 8 , Fig. 9 , Fig.11 , Fig.12 As shown, the antenna includes a reflecting plate (not shown in the figure) and a dual-polarization low-frequency vibrator unit based on coupled feeding as described in any one of the above embodiments, and also includes a high-frequency radiation unit. The high-frequency radiation unit and the low-frequency vibrator unit constitute a high and low frequency array antenna, and the dual-polarization low-frequency vibrator unit based on coupled feeding and the high-frequency radiation unit are arranged on the reflecting plate.

[0056] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above 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.

[0057] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection of the present invention.

Claims

1. A dual-polarization low-frequency oscillator unit based on coupled feeding, characterized in that: The invention comprises a radiation part and a feeding part, wherein the radiation part comprises four radiation arms, the four radiation arms are cross-symmetrically arranged, and the two radiation arms on the diagonal line form a pair of radiation groups, and the four radiation arms form two pairs of radiation groups in total, and the two pairs of radiation groups are used to generate radiation of different polarizations, a PCB coupling plate is arranged on the top of the feeding part, and four feeding metal sheets are integrated on one side surface of the PCB coupling plate, the PCB coupling plate is pressed and fixed to the radiation part, and the four feeding metal sheets are coupled and fed with the four radiation arms in a one-to-one correspondence.

2. A dual-polarization low-frequency oscillator unit based on coupled feeding according to claim 1, characterized in that: Four metal connecting plates are integrated on the other side of the PCB coupling plate. The metal connecting plates are used to be directly electrically connected to the feeding part. The positions of the four metal connecting plates and the four feeding metal plates correspond one to one and are electrically connected through metallized vias.

3. A dual-polarization low-frequency oscillator unit based on coupled feeding according to claim 2, characterized in that: The feeding part includes a feeding circuit board, the top of which is vertically plugged into the PCB coupling board, and a first feeding circuit corresponding to one polarization and a second feeding circuit corresponding to the other polarization are arranged on the feeding circuit board, and the first feeding circuit and the second feeding circuit are respectively electrically connected to the corresponding metal connecting sheets.

4. A dual-polarization low-frequency oscillator unit based on coupled feeding according to claim 2, characterized in that: The feeding part includes a first circuit board and a second circuit board which are orthogonally connected to each other. The tops of the first circuit board and the second circuit board are vertically plugged into the PCB coupling board. A first feeding circuit corresponding to one of the polarizations is arranged on the first circuit board, and a second feeding circuit corresponding to the other polarization is arranged on the second circuit board. The first feeding circuit and the second feeding circuit are respectively electrically connected to the corresponding metal connecting sheets.

5. A dual-polarization low-frequency oscillator unit based on coupled feeding according to claim 3 or 4, characterized in that: The first feeding circuit includes a first feeding signal layer and a first ground layer, and the second feeding circuit includes a second feeding signal layer and a second ground layer.

6. The dual-polarization low-frequency oscillator unit based on coupled feeding according to claim 1, characterized in that: The radiation arm is a ring-shaped sheet metal radiation arm.

7. The dual-polarization low-frequency oscillator unit based on coupled feeding according to claim 1, characterized in that: The PCB coupling plate is coated with green oil to achieve insulation isolation between the coupling metal sheet and the radiation arm.

8. The dual-polarization low-frequency oscillator unit based on coupled feeding according to claim 1, characterized in that: The PCB coupling plate is pressed and fixed to the four radiating arms of the radiating part by insulating rivets or by clamping parts.

9. The dual-polarization low-frequency oscillator unit based on coupled feeding according to claim 1, characterized in that: The radiation arm is provided with a plurality of protruding coupling branches for offsetting the high-frequency radiation current of the high-frequency oscillator induced on the low-frequency oscillator, thereby reducing the deterioration effect of the secondary radiation of the low-frequency oscillator on the high-frequency performance.

10. An antenna, characterized in that: It comprises a reflection plate and a dual-polarization low-frequency oscillator unit based on coupling feeding as described in any one of claims 1 to 9, wherein the dual-polarization low-frequency oscillator unit based on coupling feeding is arranged on the reflection plate.

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