A Continuously Variable Substrate Integrated Waveguide Analog Phase Shifter

Abstract

The patent of the present invention relates to microwave circuit technology, in particular to a continuously variable substrate integrated waveguide analog phase shifter. Including 50Ω characteristic impedance microstrip line, varactor diode, transition structure, substrate integrated waveguide and peripheral resistors, capacitors and inductors; the input end is a microstrip line with 50Ω characteristic impedance, and the signal is fed to the substrate integrated waveguide through the transition structure. In SIW, a slot is opened along the propagation direction of the electromagnetic field. This slot line divides the SIW into two parts. The width of the SIW on one side of the transition structure is W, and the width of the other side is C. The transition structure is a concave rectangle. Install varactor diodes and fixed capacitance capacitors in pairs on both sides of the slot line perpendicular to the SIW. The phase change of the phase shifter is continuously variable with the tuning voltage, the bandwidth is wide, the transmission loss is small, the reflection coefficient is small, the phase shift range is large, and it is convenient to be 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. [0002] technical background [0003] 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. . [0004] 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 valu...

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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," MicrowaveSymposium Digest, IEEE Mtt-s International.IEEE, 2011:1-4. However, the circuit structure of this reflective phase shifter is more complicated, and Need to design 3dB coupler

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