WO2014032214A1

WO2014032214A1 - Broadband phase shifter and designing method therefor

Info

Publication number: WO2014032214A1
Application number: PCT/CN2012/001457
Authority: WO
Inventors: 彭宏利; 章文昕
Original assignee: 上海交通大学
Priority date: 2012-08-27
Filing date: 2012-10-29
Publication date: 2014-03-06
Also published as: CN102832427A; CN102832427B

Abstract

Disclosed are a broadband phase shifter and a designing method therefor in the technical field of phase shifters, comprising a strip line and a conversion part. The conversion part is arranged on the strip line, and the strip line is disconnected and reconnected through the conversion part for realizing 180° phase inversion at this position. The strip line is a double-layer microstrip line, and the conversion part is arranged on one or more groups of the double-layer microstrip lines. The conversion part is an electrical connection part and is located at any position on the double-layer microstrip line. The double-layer microstrip line is flexible in wiring, and is used for realizing symmetrical designs when designing phase inversion frequency shift. The lengths of the double-layer microstrip line can be symmetrical lengths for realizing phase inversion phase shift, or the lengths of the double-layer microstrip line are asymmetrical lengths for regulating the phase shift to realize the phase shift of approximately 180°. The present invention is easy to integrate, has a small volume and a broad frequency band, can cover a plurality of frequency bands in combination with the design requirements of a power divider, and is used for a microstrip antenna and a microstrip feed system.

Description

Wideband phase shifter and design method thereof

The invention relates to the technical field of phase shifters, in particular to a wideband phase shifter which can be used in a microstrip antenna and a feeding system and a design method thereof. Background technique

The rapid development and application of mobile communication technology has strongly promoted the development of modern communication to miniaturization, integration, and multi-band. Microstrip antennas and feed networks have the advantages of low price, good integration, and ease of processing, and are widely used in wireless communication systems. However, there are not many phase shifters matched with microstrip antennas and microstrip feed networks. The design is usually highly correlated with frequency and poor in versatility, which is one of the bottlenecks restricting technological progress. Therefore, the design is easy to integrate and wideband shift. Phaser has become one of the hotspots of research at home and abroad.

Typically, the microstrip phase shifter is implemented with a length of microstrip line that is related to the center frequency of the design. Therefore, it is difficult to balance all frequency points of the entire bandwidth to achieve broadband phase shifting. In addition, in order to achieve a 180 degree phase difference of differential excitation, it is usually required that the microstrip line of one excitation end is 180 degrees longer than the other excitation end, making the overall feed structure asymmetrical, which is not conducive to the application in symmetrical antenna design. For example, in the 2007 National Microwave Millimeter Conference, Chen Jianxin et al., “Parallel-band-based broadband inverting power splitter” designed a novel reversed-phase power splitter. However, the design flexibility in this paper is very low, and the compatibility of the inverting part is not high. It is difficult to combine with other microstrip structures to achieve flexible and variable design. Summary of the invention

The present invention provides a wideband phase shifter and a design method thereof in view of the above-mentioned deficiencies in the prior art. The present invention has been achieved by the following technical solutions.

A wideband phase shifter comprising a strip line and a converting portion, the converting portion being disposed on a strip line, the strip portion being disconnected and reconnected by the converting portion for effecting inversion at the position.

The strip line is a plurality of sets of double-layer microstrip lines, and the conversion part is an electrical connection part, the number of which is one or more, and is disposed at any position on any one or more sets of double-layer microstrip lines. .

The double-layer microstrip line includes an upper layer strip line and a lower layer strip line, wherein the upper layer strip line includes the first portion and the Two parts are respectively located on both sides of the conversion part; the lower layer line includes a third part and a fourth part, respectively located on both sides of the conversion part.

The converting portion disconnects the first portion from the second portion, the third portion, and the fourth portion, respectively, and connects the first portion to the fourth portion, the second portion, and the third portion, respectively.

The broadband phase shifter also includes a floor, the floor being coupled to the belt line.

A method for designing the wideband phase shifter includes the following steps:

In the first step, according to the design and wiring needs, determine the number of strips, and determine the number of conversion parts, and place the conversion part at any position of the strip line;

In a second step, the strip line is disposed to include an upper strip line and a lower strip line, wherein the upper strip line includes a first portion and a second portion respectively located on opposite sides of the conversion portion; the lower layer strip includes the third portion and the second portion Four parts, located on both sides of the conversion part;

In the third step, the first part is connected with the second part, the third part and the fourth part respectively;

In the fourth step, the conversion part respectively breaks the first part, the second part, the third part and the fourth part, and connects the first part with the fourth part, the second part and the three parts respectively, thereby realizing the inverse of the position phase.

The design method of the double-layer microstrip line is:

- the double-layer microstrip line is set to a symmetrical length for achieving an inverted phase shift; or

- The double layer microstrip line is arranged in an asymmetrical length for adjusting the phase shift.

The two-layer microstrip line is arranged in an asymmetrical length for achieving a phase shift of approximately 180 degrees.

Taking the positive phase power splitter as an example, the working process of the present invention is that two power output ports of the positive phase power splitter are respectively connected to two sets of double layer microstrips, wherein one set of double layer microstrip lines There is a conversion section. If the length of the two sets of double-layer microstrip lines is symmetrically designed, the phase shifter functions as an inverting function, and combined with the positive phase power splitter to form an inverting power splitter, which can provide differential excitation for the antenna and the like.

The wideband phase shifter and the design method thereof provided by the invention are easy to integrate, small in size, frequency bandwidth, can be combined with the design requirements of the power divider, cover multiple frequency bands, and are used for the microstrip antenna and the microstrip feeding system. DRAWINGS

Figure 1 is a front elevational view of the present invention;

Figure 2 is a reverse side view of the present invention;

Figure 3 is a schematic diagram of a conversion part of the present invention;

Figure 4 is the Wi-Kinson positive phase splitter S parameter amplitude; Figure 5 is the Wikkinson positive phase splitter S parameter phase;

Figure 6 shows the S-parameter amplitude of the inverse power splitter;

Figure Ί is the S-parameter phase of the inverse power splitter;

In the figure, 1 is a microstrip line, 2 is a conversion part, 3 is a power divider, 4 is a floor, 101 is an upper layer line, and 102 is a lower layer line. detailed description

The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and the detailed implementation manner and the specific operation process are given, but the protection scope of the present invention is not limited to the following implementation. example.

Example 1

The present embodiment includes: a belt line 1 and a conversion portion 2 which is disposed on the belt line 1 and which is disconnected and reconnected by the conversion portion 2 for achieving inversion at the position.

The above inversion is 180 degree inversion.

Preferably, the strip line 1 may be a plurality of sets of double-layer microstrip lines, and the conversion part 2 is an electrical connection part, the number of which is one or more, and is disposed on one of the one or more sets of double-layer microstrip lines. position. The position of the conversion section is flexible, and the converter can be placed on the strip line according to the space wiring needs.

The double-layered microstrip line includes an upper layer strip line 101 and a lower layer strip line 102, wherein the upper layer strip line 101 includes a first portion and a second portion, respectively located on both sides of the conversion portion 2; the lower layer strip line 102 includes a third portion and a fourth portion Portions are located on both sides of the conversion section 2, respectively.

The converting portion 2 disconnects the first portion from the second portion, the third portion, and the fourth portion, respectively, and connects the first portion with the fourth portion, the second portion, and the third portion, respectively.

Preferably, this embodiment may also include a floor, and the floor 4 is coupled to the belt line 1 for improved characteristics. Example 2

Embodiment 2 is a design method of the wideband phase shifter provided in Embodiment 1.

This embodiment includes the following steps:

In the first step, according to the design and wiring needs, determine the number of strips, and determine the number of conversion parts, and place the conversion part at any position of the strip line; according to the function design and wiring needs, determine the number of conversion parts, each The conversion part can realize the function of inverting; design the strip line according to the function design and wiring needs. Belt line can be double Layered lines, which serve as a connection.

In the fourth step, the changing part separates the first part from the second part, the third part and the fourth part respectively, and connects the first part with the fourth part, the second part and the three parts respectively, thereby realizing the opposite of the position Phase; Place a defined number of transitions anywhere in the strip, and the transition section disconnects and reconnects the original strip. The position determination of the conversion section is almost unlimited, and can be determined based on factors such as spatial arrangement.

The above inversion is 180 degree inversion.

The design method of the double-layer microstrip line is:

- The double layer microstrip line is set to an asymmetrical length for adjusting the phase shift.

The two-layer microstrip line is set to an asymmetrical length for achieving a phase shift of approximately 180 degrees. Specifically,

Taking the positive phase splitter as an example in the above embodiment, the working process of the above embodiment is that the two power output ports of the positive phase splitter are respectively connected to two sets of double-layer microstrip lines, one of which is double-layered There is a conversion part 1 on the belt line. If the lengths of the two sets of double-layer microstrip lines are symmetrically designed, the phase shifter functions as an inverting function, and combines with the positive phase power splitter to form an inverse power splitter, which can provide differential excitation for the antenna and the like.

The phase shifter is combined with the Wilkinson positive phase splitter 3 to form a symmetrical wideband inverting splitter. The power splitter 3 operates in the frequency range of 1. 0 - 3. 0 GHz, so the characteristics of this band are examined below. Similarly, other working frequency bands can also have better phase shifting characteristics, and will not be described here. As shown in FIG. 1, the two out ports of the Wilkinson positive phase splitter 3 are respectively connected with two sets of double-layer microstrip lines of the phase shifter, wherein one set of double-layer microstrip lines has a conversion structure 2, which is realized. Inverting function. In this example, an inverse of exactly 180 degrees is achieved, and the two sets of double-layer microstrip lines are equal in length. The phase shift can be adjusted by adjusting the relative lengths of the two sets of microstrip lines. As shown in Fig. 2, the structure can optimize the overall characteristics by adding the floor 4 according to the design requirements of the power divider 3.

The conversion section 2 is an electrical connection section which can be implemented at any position of the phase shifter strip 1 depending on the design. As shown in FIG. 3, for easy identification, the two-layer microstrip line includes an upper layer line 101 and a lower layer line 102. The upper strip line 101 is divided into two parts A and B, which are respectively located on both sides of the converting portion 2. The lower strip line 102 is also converted Part 2 is divided into two parts, a and b. A and B, a and b are respectively connected. The conversion section disconnects A from B, a and b, and connects A with b, B and a. By adding the conversion portion 2 to the double-layer microstrip line, a 180 degree inversion at this position can be achieved.

The amplitude and phase of the S-parameter of the Wi lkinson splitter are shown in Figure 4 and Figure 5. The amplitude and phase of the S-parameter of the inverting power splitter combined with the phase shifter are shown in Figure 6 and Figure 7. It can be seen that the phase shifter does not affect the power division characteristics of the power splitter, but instead optimizes its characteristics. A stable phase shift of 180 degrees is achieved in the full frequency band with an error of no more than 5 degrees.

This embodiment is easy to integrate, small in size, and wide in frequency bandwidth. It can be combined with the design requirements of the power divider to cover multiple frequency bands for microstrip antennas and microstrip feed systems.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

What is claimed is: 1. A broadband phase shifter, comprising: a strip line and a converting portion, wherein the converting portion is disposed on a strip line, and the strip portion is disconnected and reconnected by the converting portion for realizing the inverse at the position phase.

2. The wideband phase shifter according to claim 1, wherein the strip line is a plurality of sets of two-layer microstrip lines, and the converting portion is an electrical connection portion, the number of which is one or more, and Set at any position on any one or more sets of double-layer microstrip lines.

The wideband phase shifter according to claim 1 or 2, characterized in that it comprises a floor, and the floor is coupled to the belt line.

A method for designing a wideband phase shifter according to any one of claims 1 to 3, characterized by comprising the following steps - a first step of determining the number of strip lines according to design and wiring requirements, and Determine the number of converted parts while placing the converted part at any position of the line;

In the fourth step, the conversion part disconnects the first part from the second part, the third part and the fourth part respectively, and connects the first part with the fourth part, the second part and the three parts respectively, thereby realizing the inverse of the position phase.

5. The method of designing a wideband phase shifter according to claim 4, wherein the design method of the double layer microstrip line is:

6. The method of designing a wideband phase shifter according to claim 5, wherein the double layer microstrip line is set to an asymmetric length for achieving a phase shift of approximately 180 degrees.