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2022-11-28
A Novel Balanced-to-Balanced Differential-Mode Negative Group Delay Microwave Circuit with Excellent Common-Mode Suppression
By
Progress In Electromagnetics Research C, Vol. 127, 61-70, 2022
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.
Citation
Zhongbao Wang Peng Han Qi Chen Hongmei Liu Shao-Jun Fang , "A Novel Balanced-to-Balanced Differential-Mode Negative Group Delay Microwave Circuit with Excellent Common-Mode Suppression," Progress In Electromagnetics Research C, Vol. 127, 61-70, 2022.
doi:10.2528/PIERC22092904
http://www.jpier.org/PIERC/pier.php?paper=22092904
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