Vol. 115

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2021-09-13

Design and Modelling of Ladder-Shape Topology Generating Bandpass NGD Function

By Samuel Ngoho, Yves Constant Mombo Boussougou, Syed Samar Yazdani, Yuandan Dong, Nour Mohammad Murad, Sebastien Lallechere, Wenceslas Rahajandraibe, and Blaise Ravelo
Progress In Electromagnetics Research C, Vol. 115, 145-160, 2021
doi:10.2528/PIERC21051603

Abstract

This paper introduces a model and design of an innovative bandpass (BP) negative group delay (NGD) distributed circuit. The passive circuit topology under study is constituted by fully distributed elements without lumped components. The NGD passive structure is implemented as a ladder shape topology composed of distributed transmission line (TL) elements. The S-matrix model is established from TL-based equivalent Z-matrix operations of TLs with respect to the ladder geometry. As a proof of concept, a two-cell ladder prototype is designed in microstrip technology, which is simulated, fabricated, and tested. The calculated and simulated measurements are in very good agreement with the validation of BP NGD behaviour. NGD value is better than -3 ns with centre frequency between 3.56 and 3.68 GHz over more than 30 MHz NGD bandwidth being observed. The circuit operates under insertion loss better than 5 dB and reflection loss better than 8 dB. This innovative BP NGD passive circuit can be useful in the RF and microwave engineering area, for example, to reduce the signal propagation delay in the upcoming and 5G telecommunication systems.

Citation


Samuel Ngoho, Yves Constant Mombo Boussougou, Syed Samar Yazdani, Yuandan Dong, Nour Mohammad Murad, Sebastien Lallechere, Wenceslas Rahajandraibe, and Blaise Ravelo, "Design and Modelling of Ladder-Shape Topology Generating Bandpass NGD Function," Progress In Electromagnetics Research C, Vol. 115, 145-160, 2021.
doi:10.2528/PIERC21051603
http://www.jpier.org/PIERC/pier.php?paper=21051603

References