volume | PIER Journals

Abstract

A novel balanced-to-balanced differential-mode negative group delay (NGD) microwave circuit with excellent common-mode suppression is proposed. The proposed circuit consists of two sections of coupled lines, six transmission lines, and four open-circuited stubs. The coupled lines combined with the open-circuited stubs produce the NGD characteristic, which is connected by the λ/2 transmission lines to form a balanced structure for excellent common-mode suppression. To verify the proposed balanced circuit, a microstrip circuit prototype with a center frequency of f₀ = 1.0 GHz is designed, fabricated, and measured. When the prototype is excited in differential mode, the measured NGD time at f₀ is -3.45 ns with an NGD bandwidth of 16.6 MHz (991.7-1008.3 MHz), insertion loss of less than 2.88 dB, and return loss of more than 11.7 dB. Furthermore, the measured common-mode suppression is greater than 41 dB in the NGD band.

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Dr. Zhongbao Wang

Dr. Peng Han

Dr. Qi Chen

Professor Hongmei Liu

Prof. Shao-Jun Fang