Continuous variable substrate integrated waveguide analog phase shifter

Abstract

The invention relates to a microwave circuit technology, in particular to a continuous variable substrate integrated waveguide analog phase shifter. The continuous variable substrate integrated waveguide analog phase shifter comprises a 50-omega characteristic impedance microstrip line, a variable capacitance diode, a transition structure, a substrate integrated waveguide (SIW) and a periphery resistor, capacitor and inductor. The input end of the microstrip line has 50-omega characteristic impedance, and a signal is fed to the SIW through the transition structure. In the SIW, a groove is formed in the transmission direction of an electromagnetic field, the SIW is divided into two parts through the groove line, the width of the side, comprising the transition structure, of the SIW is W, and the width of the other side is C. The transition structure is in a concave rectangle shape. The variable capacitance diode and a fixed capacitance value capacitor are installed on the two sides of the groove line in pairs and are perpendicular to the SIW. The phase of the phase shifter is continuously variable along with tuning voltage, the bandwidth is large, the transmission loss is small, the reflection coefficient is small, the phase shifting range is large, and the continuous variable substrate integrated waveguide analog phase shifter is conveniently integrated in a circuit.

Description

technical field [0001] The patent of the present invention relates to microwave circuit technology, especially a continuously variable substrate integrated waveguide (Substrate Integrated Waveguide, SIW) analog phase shifter. technical background [0002] Phase shifter is an important microwave device. Its main function is to shift the phase of signals in a certain frequency range. It is often used in phased array antennas, test equipment, and orthogonal decomposition of signals. A phase shifter is a two-port microwave network that generates a variable phase difference between the input and output signals of the network through a control signal. According to different working principles, it can be divided into digital phase shifters and analog phase shifters. . [0003] Substrate-integrated waveguide (SIW) is a novel microwave transmission line, which uses metal vias to obtain field propagation modes similar to waveguides on dielectric substrates. It has high Q value, small...

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Problems solved by technology

In addition, the researchers also studied the continuously adjustable analog phase shifter based on the terminal reflection type. By controlling the external voltage to change the capacitance of the varactor diode, the complex reflection coefficient of the reflective end face is changed to realize the phase change of the output signal. See Literature Yan Ding, and Ke Wu, "Varactor-tuned substrate integrated waveguide phase shifter," Microwave Symposium Digest, IEEE Mtt-s International.IEEE, 2011:1-4. However, the circuit structure of this reflective phase shifter is relatively complicated, and need to design 3dB coupler

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