Substrate integrated waveguide (SIW) phase shifter based on different filled dielectric constant materials

Abstract

The invention relates to a microwave phase shifter, in particular to a substrate integrated waveguide (SIW) phase shifter based on different filled dielectric constant materials, which comprises a branch circuit 1 and a branch circuit 2, wherein the branch circuit 1 is corresponding to a reference zero phase, the branch circuit 2 is corresponding to degrees needed to shift phases, the air is used as a propagation medium in the branch circuit 1, a SIW body medium material in the branch circuit 2 is used as a propagation medium, the phase positions of substrate integrated waveguides can be changed through the lengths of microstrip lines and the length and the width of SIW, phase shifting amounts produced by the measures can be compensated with each other, and a fixed phase difference is formed in a wideband frequency range by adjusting physical size parameters and filling materials. The SIW phase shifter based on the different filled dielectric constant materials respectively achieves 71.8% (7.55-16GHz, 45 degrees+_3 degrees) and 77.2% (7.35-16.6GHz, 90 degrees+_5.1degrees) of practical bandwidths of 45 degrees and 90 degrees phase shifts, has excellent amplitude consistency, is better than 2dB in insertion loss, and can be conveniently integrated with other plane-type passive and active circuits.

Description

technical field [0001] The present invention relates to a microwave phase shifter, in particular to a substrate integrated waveguide (Substrate Integrated Waveguide, SIW) phase shifter filled with materials of different dielectric constants, so as to realize a broadband phase shifting function. Background technique [0002] Phase shifters are used to adjust the phase of microwave signals, and are often used in phased array antennas, test equipment, and signal vector decomposition and synthesis. The bandwidth of the phase shifter is a very important index. Researchers hope to achieve the widest possible bandwidth under the premise of ensuring the performance of the phase shifter. [0003] The substrate-integrated waveguide is a new form of microwave transmission line. Its design idea is derived from the traditional waveguide structure. The field propagation mode similar to the metal waveguide is realized by two rows of metallized through-holes processed on the dielectric subs...

AI Technical Summary

Problems solved by technology

The actual measurement results are not clearly given)

[0008] The bandwidth of the first and second phase shifters still has some room for improvement within the defined phase shift accuracy range, and the reference phase of the first phase shifter is not fixed; the third phase shifter measured insertion loss comparison Large (greater than 5dB), the return loss is less than -10dB, and the practicability is questionable

Therefore, all three methods have their own limitations.

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