A novel microstrip line backward directional coupler with high directivity

• Published in: 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535) Vol. 3; pp. 1891 - 1894 Vol.3
• Main Authors: CHUN, Young-Hoon, MOON, Ju-Young, YUN, Sang-Won, RHEE, Jin-Koo
• Format: Conference Proceeding
• Language: English
• Published: Piscataway NJ IEEE 2004
• Subjects: Applied sciences; Bandwidth; Circuit properties; Circuits of signal characteristics conditioning (including delay circuits); Coupling circuits; Delay lines; Design engineering; Directional couplers; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Equations; Exact sciences and technology; Frequency; Microstrip; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; Moon; Technological innovation; Directional coupler; Directivity; Microstrip line; Parallel connection; Delay line; Coupled line
• ISBN: 0780383311; 9780780383319
• ISSN: 0149-645X; 2576-7216
• DOI: 10.1109/MWSYM.2004.1338977

A uni-planar backward directional couplers is analyzed and designed. Microstrip parallel coupled lines and asymmetrical delay lines make multi-sectioned coupler which enhances the directivity. In this paper, 20 dB multi-sectioned couplers with single and double delay lines are designed and measured to show the validation of analysis. The coupler with two delay lines has the directivity over 30 dB and the fractional bandwidth of 30% at the center frequency of 1.8 GHz.