Fractal and composite right/left-handed transmission line-based miniature double-frequency microstrip rat-race coupler

Abstract

The invention discloses a fractal and composite right/left-handed transmission line-based miniature double-frequency microstrip rat-race coupler, which consists of four composite right/left-handed transmission line (CRLH TL) braches and four input/output ports, wherein the four CRLH TL branches are sequentially connected end to end, and have a Koch fractal structure respectively; the four input/output ports are connected between every two adjacent branches respectively, and are used for connecting small A type (SMA) joints; the four branches comprise three CRLH TL branches with completely identical circuit parameters and the CRLH TL branch with different circuit parameters, namely, the four branches comprise three transmission line branches which realize +90 degrees and -90 degrees on the frequency bands of fL and fH respectively and the transmission line branch which realizes -90 degrees and -270 degrees on the frequency bands of fL and fH respectively; and each of the four branches is formed by concatenating two CRLH TL units. The fractal and composite right/left-handed transmission line-based miniature double-frequency microstrip rat-race coupler is rationally designed, convenient to realize, good in using effects, highly accuracy and widely applicable, and can effectively solve the problems of complex method, poor using effects, large volume, incapability of really working in a double-frequency mode and the like of the conventional double-frequency rat-race coupler.

Description

technical field [0001] The invention relates to a dual-frequency microstrip ring bridge, in particular to a miniaturized dual-frequency microstrip ring bridge based on fractal and composite left and right hand transmission lines. Background technique [0002] like figure 1 The shown squirrel cage coupler (rat-race coupler), also known as ring bridge or hybrid ring, is an important basic component in microwave circuits, consisting of three -90° branches and one -270° branch Composition, can be used directly as a power divider and combiner. When used as a power divider: when the signal is input from port 1 (ie port1), then port 2 and port 3 (ie port2 and port3) are output in equal amplitude and in phase, and port 4 (ie port4) is isolated; when the signal is input from port 4, Then 2-port and 3-port equal-amplitude inverting output, 1-port isolation. When used as a power combiner: when the signal is input from port 2 and port 3 with the same amplitude and phase, the energy i...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a miniaturized dual-frequency microstrip ring bridge based on fractal and composite left-handed transmission lines, which is reasonable in design, convenient in implementation, good in use effect and high in precision. , can effectively solve the defects and deficiencies existing in the existing dual-frequency ring bridge such as complex methods, poor use effect, large volume, and inability to really work in dual-frequency mode

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