WO2021128325A1

WO2021128325A1 - Calibration unit and antenna

Info

Publication number: WO2021128325A1
Application number: PCT/CN2019/129393
Authority: WO
Inventors: 沈亚川
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-07-01

Abstract

Provided are a calibration unit and an antenna. The calibration unit comprises a circuit board, a power divider arranged on the circuit board, and at least two couplers which are arranged on the circuit board, symmetrically arranged on two opposite sides of the power divider and connected to the power divider, wherein the two couplers are opposite in a first direction; each coupler comprises an input end, a coupling end, a through end, an isolation end, a first connection portion connected to the coupling end and the isolation end, and a second connection portion connected to the input end and the through end; the second connection portion and the first connection portion are parallel and extend in a second direction; the second direction is perpendicular to the first direction; in the first direction, the distance between the first connection portion and the power divider is less than the distance between the second connection portion and the power divider; the input end extends towards the power divider in the first direction, and is used for connecting to an external radio-frequency source; the coupling end is parallel to the input end and is connected to the power divider; the through end extends in the same direction as the input end and is used for connecting to a radio-frequency inlet of an antenna; and the isolation end and the input end extend in the same direction.

Description

Calibration unit and antenna

Technical field

The utility model relates to the technical field of communication, in particular to a calibration unit and an antenna.

Background technique

Mobile communication technology will greatly change people's existing lifestyles and promote the continuous development of society. In the future, the mainstream communication frequency bands will be 4G and 5G. In order to adapt to the technical characteristics of future communication technology such as high speed, low delay, and high capacity, antennas will also use more large-scale array antenna units in order to achieve array antennas. The adjustment of the power and phase of each antenna unit in the antenna requires a calibration unit of the antenna. In order to meet the needs of miniaturization of the antenna, the corresponding calibration unit should also be miniaturized.

Therefore, it is necessary to provide a compact calibration unit to solve the above-mentioned problems.

Summary of the invention

technical problem

The purpose of the utility model is to provide a calibration unit and an antenna.

The solution to the problem

Technical solutions

The utility model provides a calibration unit for calibrating the radio frequency entrance of its back-end antenna. The calibration unit includes a circuit board and a power divider arranged on the circuit board and at least two symmetrically arranged on the power divider. Couplers connected to the power splitter on opposite sides of the power splitter, and the two couplers are opposite in a first direction;

Wherein, each of the couplers includes an input end, a coupling end, a through end, an isolation end, a first connection part connecting the coupling end and the isolation end, and a second connection part connecting the input end and the through end , The second connection portion is parallel to the first connection portion and extends along a second direction, the second direction is perpendicular to the first direction, and the first connection portion is connected to the power in the first direction. The distance between the dividers is smaller than the distance between the second connecting portion and the power divider;

The input end extends toward the power splitter along the first direction, and is used for connecting with an external radio frequency source;

The coupling end is parallel to the input end and connected to the power splitter;

The through end extends in the same direction as the input end and is used to connect to the radio frequency inlet of the antenna;

The isolation end extends in the same direction as the input end.

Preferably, the isolation terminal is matched by resistance.

Preferably, the power divider includes a calibration terminal, a first power divider and a second power divider, wherein the first power divider and the second power divider are both connected to the calibration terminal and the coupling end, The first power division part and the second power division part are symmetrically arranged on opposite sides of the calibration end and are opposite in the first direction.

Preferably, the circuit board includes a reinforcing plate, a ground layer, a first substrate, a calibration unit signal line layer, an adhesive layer, and a second substrate that are sequentially stacked;

The calibration unit is formed on the signal line layer of the calibration unit.

Preferably, the calibration unit further includes an isolation wall arranged around the power splitter and the coupler.

Preferably, the isolation wall includes a first isolation portion and a second isolation portion, wherein the first isolation portion is arranged around the power splitter and the coupler; the second isolation portion is arranged at The power splitter and the coupler are connected to the first isolation part.

Preferably, the isolation wall further includes a third isolation portion, the third isolation portion is disposed between the first power division portion and the second power division portion, and is connected to the second isolation portion.

Preferably, the circuit board is provided with a plurality of through holes arranged in rows around the calibration unit, and the through holes are filled with a conductive medium and the conductive medium is grounded to form the isolation wall.

Preferably, the input terminal is provided with a power feeding port;

When the two calibration units are arranged along the first direction, the distance between two adjacent power feeding ports is at least 20 mm.

The present invention also provides an antenna, which includes the aforementioned calibration unit.

The beneficial effects of the invention

Beneficial effect

Compared with the prior art, the calibration unit provided by the present invention arranges the coupler symmetrically on opposite sides of the power divider in the first direction, and extends the input end of the coupler toward the power divider, and the coupler The coupling end is parallel to the input end and connected to the power divider. The through end of the coupler and the input end are extended in the same direction to set the input end, which can effectively reduce the size of the calibration unit in the second direction. The first directions are perpendicular to each other.

Further, the input end of the coupler extends toward the power splitter, so that the distance D between the feeding ports of the two adjacent input ends of the two adjacent two calibration units in the first direction becomes larger. When the calibration unit is in use, the feed port must be connected to an external radio frequency source through an adapter, and the adapter needs to take up a certain amount of space to be installed on the circuit board. As the distance between two adjacent power feeding ports is increased, space is provided for the adapter, and the rotation of the adapter is facilitated.

Brief description of the drawings

Description of the drawings

Figure 1 is a partial three-dimensional structure diagram of the calibration unit provided by the utility model;

Fig. 2 is a schematic top view of the structure of Fig. 1;

FIG. 3 is a schematic diagram of the structure of two calibration unit arrays;

Fig. 4 is a schematic diagram of a circuit board of the calibration unit;

Fig. 5 is a schematic diagram of a three-dimensional structure of a deformed structure of the calibration unit;

Fig. 6 is a schematic top view of a modified structure of the calibration unit;

Fig. 7 is a schematic diagram of a three-dimensional structure of an antenna provided by the utility model.

Invention embodiment

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further describes the present utility model in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present utility model, and are not used to limit the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present utility model.

It should be noted that the descriptions related to "first", "second", etc. in the present utility model are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly specifying the indicated technical features. Quantity. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on what can be achieved by a person of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that such a combination of technical solutions does not exist. , Is not within the scope of protection required by the utility model.

Please refer to Figure 1-2, the present invention provides a calibration unit 1, the calibration unit 1 is used to calibrate the signal of the radio frequency entrance of the antenna at the back end, the calibration unit 1 includes a circuit board 2 and a power divider set on the circuit board 2 The power divider 3 and at least two couplers 4 symmetrically arranged on opposite sides of the power divider 3 and connected to the power divider 3, and the two couplers 4 are oppositely arranged in the first direction.

Among them, each coupler 4 includes an input end 41, a coupling end 42, a through end 43, an isolation end 44, a first connection part 45 and a second connection part 46. Wherein, the first connection portion 45 connects the coupling end 42 and the isolation end 44, the second connection portion 46 connects the input end 41 and the through end 43, and the second connection portion 46 is parallel to the first connection portion 45 and extends along the second direction. The second direction and the first direction are perpendicular to each other.

In the first direction, the distance D1 between the first connection portion 45 and the power divider 3 is smaller than the distance D2 between the second connection portion 46 and the power divider 3.

The input terminal 41 extends in the first direction toward the power splitter 3 and is used for connecting with an external radio frequency source, and the coupling terminal 42 is parallel to the input terminal 41 and is connected to the power splitter 3. The through end 43 extends in the same direction as the input end 41 and is used to connect to the radio frequency inlet of the antenna, and the isolation end 44 extends in the same direction as the input end 41.

Preferably, the isolation terminal 44 is matched by resistance.

Preferably, the input terminal 41 is provided with a power feeding port 411, and the power feeding port 411 is used for connecting with an external radio frequency source.

Referring to FIG. 3, when two calibration units 1 are arranged along the first direction, the two calibration units 1 are connected in parallel through a two-stage power divider 6. When the two calibration units 1 are connected in parallel, the circuit board 2 can be shared, or the circuit boards 2 can be independent of each other, which is not limited here.

In this embodiment, the circuit board 2 shared by two calibration units is taken as an example for description.

Since the coupler 4 of each calibration unit 1 is symmetrically arranged on the opposite sides of the power divider 3, and the input end 41 of the coupler 4 is extended toward the power divider 3, the coupling end 42 and the input end 41 are parallel and parallel to The power divider 3 is connected, and the through terminal 43 and the input terminal 41 are extended in the same direction as the input terminal 41, so that the size of the calibration unit 1 in the second direction can be effectively reduced.

Further, the input terminal 41 of the coupler 4 extends toward the power splitter 3, so that the distance between the feeding ports 411 of the two adjacent input terminals 41 of the two adjacent two calibration units 1 in the first direction is D becomes larger. When the calibration unit 1 is in use, the power feeding port 411 is connected to an external radio frequency source through the adapter 7, and the adapter 7 is installed on the circuit board 2 to occupy a certain space. As the distance between the two adjacent power feeding ports 411 increases, space is provided for the adapter 7 to facilitate the screwing of the adapter 7, where the adapter 7 may be an SMA connector or an SMP connector.

Preferably, the distance between two adjacent feeding ports 411 of the two calibration units 1 arranged along the first direction is at least 20mm, that is, D>20mm, which is convenient for simultaneous welding and debugging of multiple ports.

The power divider 3 includes a calibration terminal 31, a first power divider 32, and a second power divider 33. The first power divider 32 and the second power divider 33 are both connected to the calibration terminal 31 and the coupling end of the coupler 4. 42 is connected, the first power division portion 32 and the second power division portion 33 are symmetrically arranged on opposite sides of the calibration end 31 along the second direction, and face each other in the first direction. As shown in FIG. 2, the calibration unit 1 The axis of symmetry is L.

Preferably, the power divider 3 is a 3dB equal power divider, and the coupling degree of the coupler 4 is -15dB.

4, in some embodiments, the circuit board 2 includes a reinforcing plate 21, a ground layer 22, a first substrate 23, a calibration unit signal line layer 24, an adhesive layer 25, and a second substrate 26 that are sequentially stacked. The unit 1 is formed on the calibration unit signal line layer 24.

Preferably, the circuit board 2 further includes an external layer 27. The external layer 27 is electrically connected to the calibration unit signal line layer 24 through metal vias or conductive elements, and pads are formed on the external layer 27 to facilitate the calibration unit signal line layer 24 and The radio frequency entrance of the antenna or external radio frequency source connection.

Referring to FIGS. 5-6, in some embodiments, the calibration unit 1 further includes an isolation wall 5, and the isolation wall 5 is arranged around the power splitter 3 and the coupler 4. Wherein, the isolation wall 5 can be formed by a plurality of through holes arranged in a row through the circuit board 2 at the periphery of the circuit board 2 where the calibration unit 1 is provided, and the through holes are filled with a conductive medium and passed through the belt The shaped wire or wire grounds the conductive medium to form the isolation wall 5.

Specifically, the isolation wall 5 includes a first isolation portion 51 and a second isolation portion 52, wherein the first isolation portion 51 is arranged around the power divider 3 and the coupler 4; the second isolation portion 52 is arranged on the power divider 3 and the coupler 4 and connected to the first isolation portion 51.

Preferably, the isolation wall 5 further includes a third isolation portion 53, and the third isolation portion 53 is disposed between the first power division portion 32 and the second power division portion 33 and is connected to the second isolation portion 52.

Referring to FIG. 7, the present invention also provides an antenna 10 that works in a 5G frequency band, and the 5G frequency band includes at least one of the 3400-3800MHz frequency band, the 2500-2700MHz frequency band, or the 4800-5000MHz frequency band.

The antenna 10 includes a radiation component 20 and a calibration unit 1 electrically connected to the radio frequency inlet 201 of the radiation component 20. Wherein, the calibration unit 1 is used to calibrate the amplitude and phase of the input signal of the radio frequency inlet 201, and the radiation component 20 may be one or more, which is not limited here.

Further, the input end of the coupler extends toward the power splitter, so that the distance D between the feeding ports of the two adjacent input ends of the two adjacent two calibration units in the first direction becomes larger. When the calibration unit is in use, the feed port must be connected to an external radio frequency source through an adapter, and the adapter needs to take up a certain amount of space to be installed on the circuit board. As the distance between the two adjacent power feed ports increases, space is provided for the adapter, which facilitates the screwing of the adapter.

The above are only the embodiments of the present utility model. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present utility model, but these all belong to the present utility model. New scope of protection.

Claims

A calibration unit for calibrating the radio frequency entrance of its back-end antenna, which is characterized by:

The calibration unit includes a circuit board, a power divider arranged on the circuit board, and at least two couplers symmetrically arranged on opposite sides of the power divider and connected to the power divider, and two The couplers face each other in the first direction;

Wherein, each of the couplers includes an input end, a coupling end, a through end, an isolation end, a first connection part connecting the coupling end and the isolation end, and a second connection part connecting the input end and the through end , The second connection portion is parallel to the first connection portion and extends along a second direction, the second direction is perpendicular to the first direction, and the first connection portion is connected to the power in the first direction. The distance between the dividers is smaller than the distance between the second connecting portion and the power divider;

The input end extends toward the power splitter along the first direction, and is used for connecting with an external radio frequency source;

The coupling end is parallel to the input end and connected to the power splitter;

The through end extends in the same direction as the input end and is used to connect to the radio frequency inlet of the antenna;

The isolation end extends in the same direction as the input end.
The calibration unit according to claim 1, wherein the isolation terminal is matched by resistance.
The calibration unit of claim 2, wherein the power divider includes a calibration end, a first power divider, and a second power divider, wherein the first power divider and the second power divider are both connected to The calibration end and the coupling end are connected, and the first power division part and the second power division part are symmetrically arranged on opposite sides of the calibration end and are opposite in the first direction.
8. The calibration unit of claim 3, wherein the circuit board comprises a reinforcing plate, a ground layer, a first substrate, a signal line layer of the calibration unit, an adhesive layer, and a second substrate that are sequentially stacked;

The calibration unit is formed on the signal line layer of the calibration unit.
The calibration unit according to claim 4, wherein the calibration unit further comprises an isolation wall, and the isolation wall is arranged around the power splitter and the coupler.
The calibration unit of claim 5, wherein the isolation wall includes a first isolation portion and a second isolation portion, wherein the first isolation portion is surrounded by the power divider and the coupler The periphery; the second isolation portion is provided between the power splitter and the coupler and connected to the first isolation portion.
The calibration unit according to claim 6, wherein the isolation wall further comprises a third isolation portion, the third isolation portion is disposed between the first power division part and the second power division part, and Connected with the second isolation part.
The calibration unit according to claim 5, wherein the circuit board is provided with a plurality of through holes arranged in rows around the calibration unit, and the through holes are filled with a conductive medium and the conductive medium Ground to form the separation wall.
The calibration unit according to claim 2, wherein the input terminal is provided with a power feeding port;

When the two calibration units are arranged along the first direction, the distance between two adjacent power feeding ports is at least 20 mm.
An antenna, characterized in that the antenna comprises the calibration unit according to any one of claims 1-9.