CN111525216A

CN111525216A - Phase shifter of integrated feeder and antenna using same

Info

Publication number: CN111525216A
Application number: CN202010476912.1A
Authority: CN
Inventors: 王强; 李志龙
Original assignee: Comba Telecom Technology Guangzhou Ltd
Current assignee: Comba Telecom Technology Guangzhou Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2020-08-11
Also published as: CN113745775A

Abstract

The invention relates to a phase shifter of an integrated feed and an antenna applying the phase shifter, wherein the phase shifter comprises a cavity, a phase shifting network, a radio frequency path and a direct current path, wherein the cavity is provided with a signal input port; the direct current path is electrically connected with one end of the radio frequency path, which is connected with the signal input port. Because the direct current path, the radio frequency path and the phase-shifting network are arranged in a separated space, the radio frequency path and the phase-shifting network share a cavity structure, the size can be greatly reduced, the matching characteristic is excellent, and the bandwidth is wider.

Description

Phase shifter of integrated feeder and antenna using same

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of communication, in particular to a phase shifter of an integrated feeder and an antenna applying the phase shifter.

[ background of the invention ]

The existing 5G era disitestar 1+1 antenna feed scheme solves 4G \5G network coverage, and a pair of antennas is required to integrate all 4G network antennas, so that the frequency bands/ports of the antennas are more and more, and fifteen-frequency thirty-port antennas are already put into the market. The number of antenna ports is large, the structure is complex, and how the ports and the array are correspondingly checked is very difficult, so the AISG3.0 requires that the antenna radio frequency ports support the PING function to check the access condition, and each radio frequency port needs to be configured with a feeder for outputting an OOK direct current signal.

The direct current path and the radio frequency path of the existing feeder are both realized in one metal cavity, the direct current path comprises a low-pass/direct current filter circuit, the low-pass filter circuit is often composed of lumped component capacitors and inductors, the occupied space is huge, the internal layout of the antenna is difficult, even the multi-frequency antenna cannot be arranged and cannot be integrated with a phase shifter, the feeder of the output direct current type is configured based on the low-pass/direct current filter circuit, the cost of the antenna is increased remarkably, and meanwhile, the assembly is difficult, complex and uneconomic.

[ summary of the invention ]

The invention aims to provide a phase shifter of an integrated feeder, which has a small size and can optimize the antenna layout.

Another object of the present invention is to provide an antenna using the phase shifter.

In order to achieve the above purpose, the present invention provides the following solutions:

as a first aspect, the present invention relates to a phase shifter of an integrated feed, comprising a cavity, and a phase shifting network, a radio frequency path and a direct current path which are arranged in the cavity, wherein the cavity is provided with a signal input port, the radio frequency path is arranged in the cavity, one end of the radio frequency path is connected with the signal input port, and the other end of the radio frequency path is connected to the phase shifting network; the direct current path is fixed with the cavity outside the cavity and is electrically connected with one end of the radio frequency path, which is connected with the signal input port.

Preferably, the radio frequency path includes a first capacitor, the first capacitor is disposed in the phase shifter cavity, one end of the first capacitor is connected to the phase shifting network, and the other end of the first capacitor is connected to the signal input port.

Preferably, the first capacitor is a microstrip line capacitor, and includes a dielectric plate for carrying the phase-shift network and conductor strips laid on two opposite sides of the dielectric plate and coupled with each other, and the conductor strips on the two sides are correspondingly connected with the phase-shift network and the signal input port.

Preferably, the first capacitor is a sleeve capacitor and includes a first conductive column, a second conductive column, and a coupling medium, one end of the first conductive column is connected to the signal input port, the other end of the first conductive column is sleeved on one end of the second conductive column, the coupling medium is distributed between the first conductive column and the second conductive column, and the other end of the second conductive column is connected to the phase shifting network.

Preferably, the dc path includes an inductor, a second capacitor, and a dc output terminal, the inductor, the second capacitor, and the dc output terminal are disposed outside the cavity, one end of the inductor passes through the cavity and is connected to one end of the rf path, which is connected to the signal input port, the other end of the inductor is connected to one end of the second capacitor, and the second capacitor is connected to the dc output terminal.

Preferably, the second capacitor is welded with a direct current transmission lead, and one end of the direct current transmission lead, which is far away from the capacitor, is used as the direct current output end; and a first insulator is arranged on the cavity and is arranged between the welding spot of the second capacitor and the direct current transmission lead and the cavity for realizing the insulation and isolation of the welding spot and the cavity.

Preferably, a connecting hole is formed in the side wall of the cavity body close to the connecting position of the radio frequency path and the signal input port, and a pin at one end of the inductor penetrates through the connecting hole to be electrically connected with the radio frequency path.

Preferably, a second insulator is disposed in the connection hole, and the second insulator is attached to the connection hole and encloses a lead connecting the inductor and the radio frequency path.

Preferably, the cavity is a double-layer cavity, and each layer of cavity is provided with the phase-shifting network, the radio frequency channel and the direct current channel.

As a second aspect, the present invention further relates to an antenna, which includes a reflection plate, a radiation unit and a phase shifter, where the radiation unit and the phase shifter are respectively disposed on two sides of the reflection plate and electrically connected, and the phase shifter is the phase shifter of the integrated feed.

Compared with the prior art, the invention has the following advantages:

1. in the phase shifter of the integrated feed, the radio frequency path and the direct current path of the feed are spatially distributed, the radio frequency path and the phase shifting network of the phase shifter share the cavity, no additional space is occupied, the direct current paths are distributed outside the cavity, the size can be greatly reduced, and the phase shifter has excellent matching characteristics and wider bandwidth.

2. In the phase shifter of the integrated feed, the radio frequency path and the direct current path belong to different spaces, the direct current path forms a low-pass filtering path, and the filtering characteristic and the suppression index after passing through the filtering circuit are better.

3. The invention shares the radio frequency path and the phase shifter cavity, the direct current path is arranged on the surface of the outer side of the phase shifter cavity, the size is small, the extra space is not occupied, the assembly is simple, and the invention is greatly suitable for the layout of the feeder supporting the PING function of the left and right radio frequency ports of the multi-frequency multi-port antenna.

[ description of the drawings ]

Fig. 1 is a perspective view of a phase shifter of an integrated feed according to one embodiment of the present invention;

FIG. 2 is an enlarged view of a portion A of the phase shifter shown in FIG. 1;

FIG. 3 is a partial cross-sectional view of the phase shifter shown in FIG. 1;

FIG. 4 is a schematic diagram of an internal circuit board of a phase shifter according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view taken along line A-A of the circuit board of FIG. 4;

FIG. 6 is a schematic diagram of an internal circuit board of a phase shifter according to another embodiment of the present invention;

fig. 7 is a sectional view of the circuit board shown in fig. 6 taken along the line a-a.

[ detailed description ] embodiments

The present invention is further described with reference to the drawings and the exemplary embodiments, wherein like reference numerals are used to refer to like elements throughout. In addition, if a detailed description of the known art is not necessary to show the features of the present invention, it is omitted.

Referring to fig. 1 to 3, as a first aspect, the present invention relates to a phase shifter 100 (hereinafter, referred to as "phase shifter") with an integrated feed, which is integrated on the basis of a phase shifter body, wherein the feed can realize interaction between a radio frequency signal and an OOK signal among an antenna, an RCU (not shown, hereinafter, the same), and a base station (not shown, hereinafter, the same) when the phase shifter is applied to the antenna (not shown, hereinafter, the same).

The phase shifter comprises a phase shifter body, and a radio frequency path 20 and a direct current path 40 which are fixed with the phase shifter body and electrically connected with each other, wherein the radio frequency path is used for transmitting radio frequency signals, and the direct current path is used for transmitting low frequency signals and direct current signals, in other words, the radio frequency path and the direct current path jointly form a feeder.

The phase shifter body specifically comprises a cavity 10, a phase shifting network 30, a phase shifting dielectric slab (not shown, the same below), and a pull rod (not shown, the same below) for pushing and pulling the phase shifting dielectric slab to move along the length direction of the cavity so as to change the dielectric constant of the phase shifting network. Since the structure of the phase shifter body is well known to those skilled in the art, it will not be described herein.

The cavity 10 may be integrally formed by a pultrusion process or a die casting process, and has a top wall, a bottom wall and a side wall connecting the top wall and the bottom wall, and at least one end of the cavity 10 is provided with an opening to provide a pull rod for driving the phase shift dielectric slab to move.

The phase shift network 30 is disposed on a dielectric plate 60 and supported in the cavity 10, and the phase shift network 30 is preferably a power division phase shift network 30, and has a signal input end and a plurality of signal output ends, so as to divide a signal into a plurality of paths of signals and output the signals, and enable a phase between the plurality of paths of signals to change according to a certain rule, for example, enable phase shift amounts of the plurality of signal output ends to form an arithmetic progression. Corresponding to the signal input end and the signal output end of the phase shifting network 30, a signal input port 101 and a signal output port are arranged on the cavity 10.

Preferably, the radio frequency path 20 includes a radio frequency input end 201, a first capacitor 202 and a radio frequency output end, which are connected in sequence, where the radio frequency input end 201 is connected to the signal input port 101, and the radio frequency output end is connected to an input end of the phase shift network 30, so as to implement connection between the radio frequency path 20 and the phase shift network 30. The rf input 201 may be used as an antenna port, and is connected to a base station via a transmission cable. The rf path 20 may couple the rf signal received from the antenna radiating element to the base station, or couple the rf signal from the base station to the antenna radiating element for radiating outwards. The first capacitor 202 is connected in series between the signal input port 101 and the rf output port, and is configured to suppress low-frequency signals and isolate direct current through rf signals.

Referring to fig. 4 and fig. 5, in one embodiment, the first capacitor 202 includes a dielectric plate and

conductive strips

2021 and 2022 disposed on two sides of the dielectric plate 60, wherein the two

conductive strips

2021 and 2022 are disposed opposite to each other and can be coupled to each other, thereby forming a microstrip line capacitor. The two-

sided conductor strips

2021, 2022 are connected to the signal input port 101 and the phase shift network 30, respectively.

Referring to fig. 6 and fig. 7, in another embodiment, the first capacitor 202 is a sleeve capacitor, and includes a first conductive pillar 2023, a second conductive pillar 2024 and a coupling medium 2025, one end of the first conductive pillar 2023 is connected to the signal input port 101, the other end is opened with a coupling hole (not labeled, the same applies below), the coupling medium 2025 is sleeved on an end of the second conductive pillar 2024 and inserted into the coupling hole of the first conductive pillar 2023, so as to realize the coupling connection between the first conductive pillar 2023 and the second conductive pillar 2024, and the other end of the second conductive pillar 2024 is connected to the phase shifting network 30.

The above two forms of the first capacitor 202 are provided, but should not be construed as constituting a limitation to the use of a capacitor, which may also be other capacitors suitable for radio frequency signal transmission, which may be isolated from direct current.

Preferably, the dc path 40 includes a dc input terminal (not shown), an inductor 41, a second capacitor 42 and a dc transmission wire 43 connected in sequence, and an end of the dc transmission wire 43 far from the second capacitor 42 constitutes a dc output terminal, which can be connected to the RCU via a cable. One end of the inductor 41 passes through the cavity 10 and is connected to one end of the first capacitor 202 connected to the signal input port 101, so that a low-frequency signal (such as an OOK signal) from a base station and a direct current can be separated, and transmitted to a direct current output terminal through a direct current transmission wire 43, and then output to the RCU.

In the direct current path, the inductor 41 and the second capacitor 42 form a low-pass filtering path for isolating the radio frequency signal, allowing a low-frequency signal (such as an OOK signal) and a direct current signal to pass through, and having a better filtering characteristic and a better suppression index.

In other embodiments, the dc path may not include the second capacitor 42, only include the inductor 4121, and may also isolate the radio frequency signal, so as to implement transmission of the dc signal and the low frequency signal between the base station and the RCU. When the second capacitor 42 is not provided in the dc path, the end of the inductor 41 away from the first capacitor 202 is connected to the dc transmission line 43, and is connected to the RCU via the dc transmission line 43.

Preferably, the cavity 10 corresponds to a connection portion of the first capacitor 202 and the inductor 41, that is, a connection hole is formed on a side wall of the cavity 10 near a connection position between the rf path 20 and the signal input port 101, and a pin at one end of the inductor 41 passes through the connection hole to be electrically connected to the rf path 20. Preferably, a second insulator 51 is arranged in the communication hole, the second insulator 51 is attached to the connection hole and encloses the pin connected with the inductor 41 and the radio frequency path 20, so that the positioning of the pin of the inductor 41 is realized, the stability of the connection part is ensured, and the insulation between the inductor 41 and the cavity 10 is realized.

A wiring groove (not labeled) for fixing the coaxial cable is formed in the side wall of the cavity 10, the second capacitor 42 is embedded in the wiring groove, one end of the second capacitor is connected with one end of the inductor 41 far away from the radio frequency channel 20, and the other end of the second capacitor is welded with the direct current transmission wire. The cavity 10 is further provided with a first insulator 52, which is padded between a solder joint of the capacitor and the dc transmission line and the cavity 10 to realize isolation between the solder joint and the cavity 10, that is, to realize insulation between the cavity 10 and the dc path.

In the invention, the cavity 10 is preferably a double-layer cavity, and each layer of cavity 10 is provided with the phase shift network 30, the radio frequency path 20 and the direct current path, so as to support the phase shifter to be applicable to a double-frequency antenna and realize the phase shift function of two frequency band signals.

In summary, the phase shifter provided by the present invention integrates the power feeder, and the rf path 20 and the phase shifting network 30 are disposed in the cavity 10 together, so that no extra space is occupied, and the dc path is disposed outside the cavity 10, so as to implement a space-division design, and the cavity 10 can be greatly reduced in size, and has excellent matching characteristics and wider bandwidth. The direct current path forms a low-pass filtering path, and the filtering characteristic and the suppression index are better after passing through the filtering circuit. In addition, the phase shifter body and the feeder are arranged in a combined mode, assembly is simple, and layout of the feeder supporting the left radio frequency port PING function and the right radio frequency port PING function of the multi-frequency multi-port antenna is greatly adapted.

The present invention also relates to an antenna using the phase shifter, which includes a reflector, and a plurality of radiation elements disposed on the front and back surfaces of the reflector and electrically connected to the phase shifter. By applying the phase shifter, the antenna has the advantages of simple layout, excellent matching characteristic and wider bandwidth.

Although a few exemplary embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these exemplary embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims

1. The phase shifter of the integrated feeder comprises a cavity and a phase shifting network arranged in the cavity, wherein the cavity is provided with a signal input port; the direct current path is fixed with the cavity outside the cavity and is electrically connected with one end of the radio frequency path, which is connected with the signal input port.

2. The phase shifter of the integrated feed according to claim 1, wherein the rf path comprises a first capacitor, the first capacitor is disposed in the phase shifter cavity, and one end of the first capacitor is connected to the phase shifting network, and the other end of the first capacitor is connected to the signal input port.

3. The phase shifter of the integrated power feeder according to claim 2, wherein the first capacitor is a microstrip line capacitor, and comprises a dielectric plate for carrying the phase shifting network and conductor strips laid on two opposite sides of the dielectric plate and coupled with each other, and the conductor strips on the two sides are correspondingly connected with the phase shifting network and the signal input port.

4. The phase shifter of the integrated feed of claim 2, wherein the first capacitor is a sleeve capacitor and comprises a first conductive post, a second conductive post, and a coupling medium, one end of the first conductive post is connected to the signal input port, the other end of the first conductive post is sleeved on one end of the second conductive post, the coupling medium is distributed between the first conductive post and the second conductive post, and the other end of the second conductive post is connected to the phase shifting network.

5. The phase shifter of the integrated power feeder according to claim 1, wherein the dc path comprises an inductor, a second capacitor and a dc output terminal, the inductor, the second capacitor and the dc output terminal are disposed outside the cavity, one end of the inductor passes through the cavity and is connected to one end of the rf path connected to the signal input port, the other end of the inductor is connected to one end of the second capacitor, and the second capacitor is connected to the dc output terminal.

6. The phase shifter of the integrated feeder according to claim 5, wherein the second capacitor is soldered to a DC transmission wire, and one end of the DC transmission wire, which is far from the capacitor, is used as the DC output end;

and a first insulator is arranged on the cavity and is arranged between the welding spot of the second capacitor and the direct current transmission lead and the cavity for realizing the insulation and isolation of the welding spot and the cavity.

7. The phase shifter of the integrated power feeder according to claim 5, wherein a connection hole is formed in the sidewall of the cavity near a connection position of the radio frequency path and the signal input port, and a pin at one end of the inductor penetrates through the connection hole to be electrically connected with the radio frequency path.

8. The phase shifter of the integrated feed of claim 7, wherein a second insulator is disposed in the connection hole, the second insulator fitting into the connection hole and enclosing a pin connecting the inductor and the radio frequency path therein.

9. The phase shifter of the integrated feeder according to any one of claims 1 to 8, wherein the cavities are double-layer cavities, and each layer of cavities is provided with the phase shifting network, the radio frequency path and the direct current path.

10. An antenna, comprising a reflection plate, a radiation element and a phase shifter, wherein the radiation element and the phase shifter are respectively arranged on two sides of the reflection plate and electrically connected, characterized in that the phase shifter is the phase shifter of the integrated feeder according to any one of claims 1 to 9.