Dual-period ultra-slow-wave microstrip delay line

Abstract

A double-period ultra-slow wave microstrip delay line comprising a dielectric substrate (1), a microstrip surface wave transmission line (2) arranged on the dielectric substrate (1), and a microstrip to microstrip surface wave transmission line transition (3); The microstrip surface wave transmission line (2) is composed of a top metal strip (10) and a bottom metal strip (11), and the top inner groove (20), the bottom inner groove (21), and the top groove are arranged respectively (22) and the bottom surface groove (23) array, the delay line is a transmission line with a double periodic structure, and its working frequency band is close to the cut-off frequency of the microstrip surface wave transmission line (2). The delay line has uniform time delay, small mutual coupling and small size in the working frequency band; the delay line has a planar structure, is easy to integrate, and has low manufacturing cost.

Description

technical field [0001] The invention relates to a microwave delay line, in particular to a double-period ultra-slow wave microstrip delay line. Background technique [0002] A delay line is a common microwave passive component used in phased array and pulse compression systems. A delay line delays the time it takes for a signal to pass through itself. Due to the high speed of electromagnetic wave transmission, the size of the delay line is usually required to be small so as to provide the longest possible time delay in a small size. If the signal travels at the speed of light in air, a time delay of 1 microsecond requires a delay line of 300 meters. In order to reduce the size of the delay line, it is usually necessary to reduce the propagation speed of the signal on the delay line, and the delay line must be folded section by section. Commonly used delay lines for microwave signal delay include inductance-capacitance delay lines with concentrated parameters, ultrasonic d...

AI Technical Summary

Problems solved by technology

The inductance-capacitance delay line with lumped parameters has a low operating frequency

The transducer structure of the ultrasonic delay line is complicated, it is not easy to integrate with the system components, and the working frequency is not high

Optical fiber delay lines have the advantages of wide bandwidth, low loss, anti-interference, and good confidentiality, but the structure of optical fiber delay lines is quite complicated and difficult to integrate, and the cost is high

Commonly used microwave transmission line delay lines include microstrip delay line, microstrip delay line and stripline delay line, etc., but in these delay lines, the main mode of electromagnetic wave is TEM mode or quasi-TEM mode, and the propagation speed of the signal is still relatively slow High, so that the size of the delay line is still relatively large, and the mutual coupling between adjacent transmission lines is strong

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