A broadband negative group delay microwave circuit and its design method

Abstract

The invention discloses a wideband negative group delay microwave circuit and a design method thereof. The wideband negative group delay microwave circuit is provided with a signal input port, a signal distribution transmission line, isolating resistors, a phase shift transmission line, a signal synthesis transmission line and a signal output port, wherein the signal distribution transmission lineis provided with an upper branch signal distribution transmission line and a lower branch signal distribution transmission line; the signal synthesis transmission line is provided with an upper branch signal synthesis transmission line and a lower branch signal synthesis transmission line; the upper branch signal synthesis transmission line and the lower branch signal synthesis transmission lineare connected with the signal output port at the same time; two ends of a first isolating resistor in the isolating resistors are connected with the upper branch signal distribution transmission lineand the lower branch signal distribution transmission line respectively; and two ends of a second isolating resistor are connected with the upper branch signal synthesis transmission line and the lower branch signal synthesis transmission line respectively. Through adoption of the wideband negative group delay microwave circuit, the wideband negative group delay characteristic can be realized. Moreover, the input port and the output port can be matched well. The wideband negative group delay microwave circuit has the characteristics of simple design method and the like.

Description

technical field [0001] The invention relates to a microwave circuit, in particular to a broadband negative group delay microwave circuit and a design method thereof. Background technique [0002] Wireless communication is developing in the direction of broadband, and the design requirements for microwave devices are also getting higher and higher. Negative group delay microwave circuits have broad application prospects in the design of microwave devices. For example, the negative group delay microwave circuit can compensate the frequency-variable group delay characteristics of microwave devices to improve the linearity of the system's phase-frequency characteristics; it can be used in feed-forward amplifiers to improve its efficiency; it can be used in feedback amplifiers to expand its bandwidth; it can be used in antenna arrays In the feed network, the unnecessary phase shift caused by the frequency change of the feed network can be eliminated, thereby improving the stabil...

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Problems solved by technology

In recent years, in order to improve the bandwidth of negative group delay microwave circuits, foreign scholars have proposed design methods based on absorbing band-rejection filter structures and design methods based on transverse filter structures, but the negative group delay microwave circuits designed by these two methods The insertion loss of the circuit is still greater than 21dB

In addition, foreign scholars have also proposed the method of loading lossy feedback loops with parallel coupled lines and the method of finite quality factor resonant cross-coupling, but these two methods can only reduce the insertion loss of negative group delay microwave circuits, and cannot improve its bandwidth

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