Microwave Negative Group Delay Circuit: Filter Synthesis Approach

Title & Authors
Microwave Negative Group Delay Circuit: Filter Synthesis Approach
Park, Junsik; Chaudhary, Girdhari; Jeong, Junhyung; Jeong, Yongchae;

Abstract
This paper presents the design of a negative group delay circuit (NGDC) using the filter synthesis approach. The proposed design method is based on a frequency transformation from a low-pass filter (LPF) to a bandstop filter (BSF). The predefined negative group delay (NGD) can be obtained by inserting resistors into resonators. To implement a circuit with a distributed transmission line, a circuit conversion technique is employed. Both theoretical and experimental results are provided for validating of the proposed approach. For NGD bandwidth and magnitude flatness enhancements, two second-order NGDCs with slightly different center frequencies are cascaded. In the experiment, group delay of $\small{5.9{\pm}0.5ns}$ and insertion loss of $\small{39.95{\pm}0.5dB}$ are obtained in the frequency range of 1.935-2.001 GHz.
Keywords
Bandstop Filter;Frequency Transformation;Filter Approach;Low Pass Filter Prototype;Negative Group Delay;
Language
English
Cited by
1.
Novel design of a 2.1–2.9 GHz negative capacitance using a passive non-Foster circuit, IEICE Electronics Express, 2017, 14, 1, 20160955
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