Lu, Yun-Long, Liu, Taijun, Wang, Yi and Hua, Changzhou (2016) Design of a compact filtering rat-race hybrid with half-wavelength resonators. Electronics Letters, 52 (21). pp. 1780-1782. ISSN 0013-5194 (Print), 1350-911X (Online) (doi:https://doi.org/10.1049/el.2016.2225)

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Abstract

A novel compact filtering rat-race hybrid coupler with improved upper stopband is presented in this letter. Four coupled-resonator pairs are utilized to replace the λ/4- and 3λ/4-transmission lines in the conventional hybrid. Each coupled-resonator pair exhibits a bandpass filtering response and acts as a K-inverter. Eight resistors are placed at the center of the λ/2-resonators to suppress the 2nd-harmonic. For verification, a filtering rat-race hybrid is implemented with a center frequency of 1.27 GHz and 20-dB rejection band of 2.73 f0. Good in-phase and out-of-phase characteristics are obtained. The proposed device has a simple circuit topology, compact size and good performance.

Item Type:	Article
Uncontrolled Keywords:	filter, rat-race coupler, inverter
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Engineering (ENG)
Last Modified:	11 Sep 2017 21:05
URI:	http://gala.gre.ac.uk/id/eprint/15776

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