A New Wide-Band and Reduced-Size Hybrid Ring

Tadashi KAWAI  Isao OHTA  

IEICE TRANSACTIONS on Electronics   Vol.E86-C    No.2    pp.134-138
Publication Date: 2003/02/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Circuit and Device Technology for High-Speed Wireless Communication)
Category: Passive (Coupler)
hybrid ring,  equivalent admittance,  uniplanar circuit,  phase inverter,  broadband,  

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This paper presents a miniaturized reverse-phase hybrid ring by the use of shunt capacitors, and successfully designs a very miniature hybrid ring of a 0.28-wavelength circumference with a wide bandwidth comparable to the regular reverse-phase hybrid ring based on the equivalent admittance approach. Moreover, a method of broadening the bandwidth with adding a matching network consisting of a very short transmission line and two shunt capacitors at each port is also described. The validity of the proposed design is demonstrated by electromagnetic simulator (Sonnet em) for a uniplanar hybrid ring.