A Design of Reconfigurable Negative Group Delay Circuit Without External Resonators

Authors:
Publisher website
Google Scholar
Abstract
In this letter, we present the novel design and implementation of a microstirp line reconfigurable negative group delay circuit (NGDC) using a branch-line. Theoretical analysis shows that reconfigurable characteristics in the proposed circuit can be obtained by properly choosing the characteristic impedances of the branch-line and tuning only the termination resistance. Therefore, the proposed reconfigurable NGDC does not require any extra resonators. For experimental validation, the proposed circuit was designed and fabricated for a wideband code division multiple access downlink frequency operating at a center frequency ( f0) of 2.14 GHz. Measurement results show the group delays variation of -2 ns to -10 ns with signal attenuation variation of -25 dB to -36.6 dB at f0. For enhancement of the negative group delay bandwidth, two NGDCs operating at slightly different center frequencies are cascaded and measured.
Funding Information
  • This research was supported by Basic Science Research Program through the National Research Foundation of Korea NRF funded by the Ministry of Education ((2014R1A1A2007779))

This publication has 14 references indexed in Scilit: