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Modelling, analysis and testing of an active element based wide-band frequency tunable compact rat-race hybrid
, S.K. Behera
Published in Elsevier GmbH
Volume: 103
Pages: 24 - 31
The article focuses on detail mathematical modelling and analysis of a wideband frequency reconfigurable 180° hybrid followed by experimental verification. The device is designed by replacing basic λ g /4 lines with varactor based low-pass equivalent circuits, which results dimensional compactness (0.16λ×0.18λ×0.008λ at 1.6 GHz) of 70% compared to the conventional structure. The operational frequencies of the hybrid are altered by simultaneously tuning six active varactor diodes in reverse biased mode which shows overall wide operational tunable bandwidth (83%, |S 11 |<-10 dB and 68.4% due to matching of transmission coefficients). To validate the design methodology, a prototype is developed and experimentally verified. Good agreement between measurement and simulation results affirms that the device can be operated at different intermediate frequencies between 1.2 GHz and 2.9 GHz. Responses at three frequencies of 1.6 GHz, 2.05 GHz and 2.5 GHz are presented, where the device achieves 37.2%,38% and 32% of measured impedance bandwidths respectively. All the above-discussed features, low insertion loss along with cost effectiveness make the proposed device convenient for different microwave circuits and RF systems. © 2019
About the journal
JournalData powered by TypesetAEU - International Journal of Electronics and Communications
PublisherData powered by TypesetElsevier GmbH