阅读说明：本技术 一种通过更换电阻实现耦合量可调的定向耦合器 (Directional coupler capable of realizing adjustable coupling amount by replacing resistor ) 是由 刘朋朋 王佳欣 臧恒 夏熙 于 2021-07-02 设计创作，主要内容包括：本发明为一种通过更换电阻实现耦合量可调的定向耦合器,由主线传输线、副线传输线、四条高阻抗线及两个可更换电阻组成。高阻抗线一端连接主线传输线或副线传输线,另一端连接电阻的一端。通过更换电阻实现不同耦合量。可以利用原有传输线进行设计,在原有传输线基础上仅增加两个电阻,一条副线传输线,一个匹配负载即可实现定向耦合器功能,成本低。本发明与额外串联一个定向耦合器相比,减小了互连损耗。能够耐大功率,耐功率能力完全取决于主线传输线的耐功率能力。(The invention relates to a directional coupler capable of realizing adjustable coupling amount by replacing resistors, which consists of a main line transmission line, a secondary line transmission line, four high-impedance lines and two replaceable resistors. One end of the high-impedance line is connected with the main line transmission line or the auxiliary line transmission line, and the other end of the high-impedance line is connected with one end of the resistor. Different coupling amounts are realized by replacing the resistor. The directional coupler can be designed by utilizing the original transmission line, the functions of the directional coupler can be realized by only adding two resistors, one auxiliary line transmission line and one matched load on the basis of the original transmission line, and the cost is low. The invention reduces the interconnection loss compared with the additional series connection of a directional coupler. The power-resisting capacity is completely dependent on the power-resisting capacity of the main line transmission line.)

1. The utility model provides a realize coupling volume adjustable directional coupler through changing resistance which characterized in that: the high-impedance transmission line comprises a main line transmission line, a secondary line transmission line, four high-impedance lines and two replaceable resistors; the left side of the main line transmission line is an input port, the right side of the main line transmission line is an output port, the left side of the auxiliary line transmission line is an isolation port, the right side of the auxiliary line transmission line is a coupling port, the isolation port is connected with a matched load, and the characteristic impedance Z of the main line transmission line and the characteristic impedance Z of the auxiliary line transmission line are₀Similarly, the line width w1 of the main line transmission line is the same as the line width w3 of the auxiliary line transmission line, one end of the high impedance line is connected with the main line transmission line or the auxiliary line transmission line, the other end of the high impedance line is connected with one end of the resistor, and the line width w2 of the high impedance line and the line width w1 of the main line transmission line meet the requirement of w2<0.3w1, the distance between the main line transmission line and the auxiliary line transmission line is L3, and the L3 is satisfied>3w1, the distance L1 between two high impedance lines in the horizontal direction is 0.2 lambda-0.3 lambda, wherein lambda is the medium wavelength of the main line transmission line, different coupling quantities are realized by replacing resistors, and the resistance value R of the resistor>5Z₀。

2. The directional coupler according to claim 1, wherein the coupling amount is adjustable by replacing the resistor, and the directional coupler is characterized in that: and printing a solder mask layer outside the resistance pad.

3. A directional coupler according to claim 1 or claim 2, wherein the amount of coupling is adjustable by replacing the resistor, and wherein: the length L2 of the high impedance line close to the main line transmission line and the length L4 of the high impedance line close to the auxiliary line transmission line are 0, and the resistor is directly bridged on the main line transmission line and the auxiliary line transmission line.

Technical Field

The invention relates to a directional coupler, and belongs to the technical field of radar feeder lines.

Background

Radars often need to detect the power level of the transmitted high power microwave signal, and high power directional couplers are key devices for achieving this function. Different radars have different requirements on the coupling amount of the directional coupler due to different transmitting powers. In addition, even if the radar transmitting power is the same, the requirements for the coupling amount of the directional coupler are different due to different detection chip detection power ranges, and the coupling amount of the directional coupler may need to be finely adjusted due to different transmission line lengths during system tuning. At present, some existing coupling quantity adjustable directional couplers need structural parts such as adjusting holes or screws, are complex in structure and cannot be integrated on a printed board, some existing coupling quantity adjustable directional couplers need to be implemented by adding a capacitor, an inductor and the like to form a tuning circuit, extra power supply is needed, and circuit complexity is obviously increased.

Disclosure of Invention

The invention relates to a directional coupler capable of realizing adjustable coupling amount by replacing a resistor, which is mainly used for solving the problems that the conventional directional coupler with adjustable coupling amount is complex in structure, cannot be integrated on a printed board or is complex in circuit and high in cost.

The invention relates to a directional coupler capable of realizing adjustable coupling amount by replacing resistors, which comprises a main line transmission line, a secondary line transmission line, four high-impedance lines and two replaceable resistors. The left side of the main line transmission line is an input port, the right side of the main line transmission line is an output port, the left side of the auxiliary line transmission line is an isolation port, the right side of the auxiliary line transmission line is a coupling port, and the isolation port is connected with a matched load. Characteristic impedance Z of main line transmission line and auxiliary line transmission line₀Similarly, the main line transmission line width w1 is the same as the sub line transmission line width w3, i.e., w1 is equal to w 3. One end of the high-impedance line is connected with the main line transmission line or the auxiliary line transmission line, and the other end of the high-impedance line is connected with one end of the resistor. The line width w2 of the high impedance line and the line width w1 of the main line transmission line satisfy w2<0.3w1 solder mask may be printed on the outside of the resistor pad. The distances between the main line transmission line and the auxiliary line transmission line are L3 and L3>3w 1. The distance L1 between two high impedance lines in the horizontal direction is 0.2 lambda-0.3 lambda, and lambda is the medium wavelength of the main line transmission line. Preferably, to reduce the size, the length L2 of the high impedance line close to the main line transmission line and the length L4 of the high impedance line close to the sub line transmission line may be 0, and the resistor is directly connected across the main line transmission line and the sub line transmission line. Different coupling amounts are realized by replacing the resistor. Preferably, the resistance value R is such that the transmission power of the main line transmission line is not significantly reduced>5Z₀。

The invention has the technical characteristics and obvious advantages that:

1. a novel directional coupler with adjustable coupling amount is provided.

2. Different coupling amounts can be realized on the same printed board only by replacing the resistor, and the method is simple and feasible.

3. The method can be designed by utilizing the original transmission line, the function of the directional coupler can be realized by only adding two resistors, one auxiliary line transmission line and one matched load on the basis of the original transmission line, the cost is low, and compared with the method of additionally connecting the directional coupler in series, the method reduces the interconnection loss.

4. The power endurance of the directional coupler is completely determined by the power endurance of the main line transmission line, and the main line transmission line can withstand high power.

The present invention is described in further detail below with reference to the attached drawing figures.

Drawings

Fig. 1 is a directional coupler with adjustable coupling amount by replacing a resistor.

The high-impedance line comprises a main line transmission line 1, a secondary line transmission line 2, a high-impedance line 3, a resistor 4, an input port 5, an output port 6, a coupling port 7, an isolation port 8, a solder mask 9, a L1, a distance between two high-impedance lines in the horizontal direction, a length of a high-impedance line close to the main line transmission line L2, a distance between the main line transmission line L3 and the secondary line transmission line L4, a length of a high-impedance line close to the secondary line transmission line W1-main line transmission line width, a high-impedance line width W2 and a secondary line transmission line width W3.

Detailed Description

The invention provides a directional coupler capable of realizing adjustable coupling amount by replacing a resistor, which comprises the following embodiments (see attached drawings):

1. a directional coupler capable of realizing adjustable coupling amount by replacing resistors is composed of a main line transmission line 1, a secondary line transmission line 2, four high-impedance lines 3 and two replaceable resistors 4. The left side of the main line transmission line 1 is an input port 5, the right side of the main line transmission line is an output port 6, the left side of the auxiliary line transmission line 2 is an isolation port 8, the right side of the auxiliary line transmission line is a coupling port 7, and the isolation port 8 is connected with a matched load. Characteristic impedance Z of main line transmission line 1 and sub line transmission line 2₀Similarly, the same width w1 ═ w 3.

2. One end of the high impedance line 3 is connected with the main line transmission line 1 or the auxiliary line transmission line 2, and the other end is connected with one end of the resistor 4. The line width w2 of the high impedance line 3 and the line width w1 of the main line transmission line 1 meet w2<0.3w1, and a solder mask layer 9 can be printed on the outer side of a pad of the resistor 4.

3. The distance between the main line transmission line 1 and the auxiliary line transmission line 2 is L3, and L3>3w 1. The distance L1 between two high impedance lines in the horizontal direction is 0.2 lambda-0.3 lambda, and lambda is the medium wavelength of the main line transmission line. For size reduction, the length L2 of the high impedance line 3 close to the main line transmission line 1 and the length L4 of the high impedance line 3 close to the sub line transmission line 2 may be 0, and the resistor 4 is directly connected across the main line transmission line 1 and the sub line transmission line 2.

4. Different coupling amounts are realized by replacing the resistor. In order not to significantly reduce the transmission power of the main line transmission line 1, the resistance value R >5Z 0.