Slot line-based difference 90-degree Schiff-man phase shifter

Abstract

The invention provides a slot line-based difference 90-degree Schiff-man phase shifter, which is used for solving the technical problems of low common-mode rejection degree and narrow phase shift bandwidth in the prior art. The phase shifter comprises a first dielectric plate and a second dielectric plate which are stacked up and down; a pair of first U-shaped microstrip lines with opposite opening directions is printed at the positions, close to a group of opposite sides, of the upper surface of the first dielectric plate, and a rectangular microstrip line is printed between the two pairs of first U-shaped microstrip lines. The metal floor on the upper surface of the second dielectric plate is etched with a first composite slot line which is used as a reference line and is composed of an inverted C-shaped slot, a first rectangular slot and a first L-shaped slot, and a second composite slot line which is used as a main line and is composed of a third rectangular slot, a second L-shaped slot and a second rectangular slot linear slot. A microstrip-to-slot structure is formed by the microstrip on the first dielectric plate and the slot on the second dielectric plate to suppress common-mode signals, and stable phase shift is realized by utilizing different phase shift characteristics of the main line and the reference line.

Description

technical field [0001] The invention belongs to the field of microwave and radio frequency technology, and relates to a differential phase shifter, in particular to a slot line-based differential 90-degree Scheffman phase shifter, which can be applied to radio frequency microwave communication systems. Background technique [0002] The phase shifter is a key device that uses its ability to generate a relatively constant phase difference to achieve fast and accurate beams of phased array antennas or smart antenna systems. It consists of two parts, the main line and the reference line, and is used in the RF front-end circuit. Its performance is good Bad often directly affects the pros and cons of the entire communication system. There are many kinds of phase shifters, such as: Scheffman phase shifter, broadside coupling structure phase shifter, high / low pass network phase shifter, etc. Among them, the Scheffman phase shifter consists of an ordinary uniform transmission line A...

AI Technical Summary

Problems solved by technology

Among them, the ladder impedance of the center load is used to achieve common mode rejection, and the quarter-wavelength coupling line and two quarter-wavelength branch lines are used to reduce the phase shift error. The whole structure achieves a relatively stable phase shift amount, but due to Its entire design is all implemented by microstrip, resulting in its low common-mode rejection and narrow phase-shift bandwidth

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