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Design of Duplexers for Microwave Communication Systems Using Open-loop Square Microstrip Resonators

Ndujiuba, Charles Uzoanya and John, S. N. and Taofeek, Bello (2016) Design of Duplexers for Microwave Communication Systems Using Open-loop Square Microstrip Resonators. International Journal of Electromagnetics and Applications., 06 (01). pp. 7-12. ISSN e-ISSN: 2168-5045

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This paper proposes a duplexer design with two microstrip bandpass filters which are designed using Open Loop Square Resonator method and matching between these two bandpass filters using T-junction matching devices. Both seven-pole band-pass filters for the receiver at 1710-1785 MHz and transmitter at 1805-1880 MHz, with fractional bandwidth of 4.29% and 4.07% respectively, of the center frequencies were implemented by resonators and admittance inverters with a 0.1dB ripple in the pass band. Agilent Advance Design Simulation (ADS) EM simulator was used in obtaining the dimensions of the resonators, extraction of coupling coefficients and external quality factors associated with the microstrip design. Results obtained showed a return loss of about 8dB, insertion loss less than 1dB and isolation between transmit and receive filters of about 32dB. The choice of the square open-loop resonators against parallel coupled lines is to avoid the inherent shift in the center frequency of the parallel coupled technique. The designed microstrip duplexer filter showed good agreement with theoretical results.

Item Type: Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering, Science and Mathematics > School of Electronics and Computer Science
Depositing User: Dr. Charles U Ndujiuba
Date Deposited: 24 Mar 2016 13:03
Last Modified: 22 Mar 2017 13:45

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