標題: Exact Synthesis of Unequal Power Division Filtering Rat-Race Ring Couplers
作者: Chou, Po-Jung
Yang, Chih-Chuan
Chang, Chi-Yang
電信工程研究所
Institute of Communications Engineering
關鍵字: Arbitrary power division;couplers;exact synthesis method;power dividers;rat-race ring
公開日期: 1-七月-2018
摘要: Exact synthesis of unequal power division filtering rat-race ring couplers is proposed. The power division property results from the half-symmetric core ring structure of the proposed couplers. The proposed core ring was modified from the equal power division rat-race ring in 2015 where the core ring in that circuit is fully symmetric. Due to the half-symmetry of ring and unequal power division characteristics, the signal excitation and circuit partition methods in 2015 cannot be applied. In this paper, the modified signal-excitation method and the source-division technique are proposed to reduce the original four-port rat-race ring couplers into the corresponding two-port networks. These two-port networks can be exactly synthesized by the S-domain filter synthesis method. Alternatively, the simplified design equations are proposed. Using these equations, the rat-race ring hybrid in 2015 can be transformed into the arbitrary power division rat-race ring couplers. Therefore, the final rat-race ring couplers are provided with some user-defined specifications, such as the unequal power division, the input/output impedance transformation, the center frequency, the fractional bandwidth, and the return loss level. Two fifth-order filtering rat-race ring couplers with 3- and 10-dB power division are implemented as examples; in addition, these couplers are with a center frequency of 2 GHz, a fractional bandwidth of 100%, a return loss level of 20 dB, and the input/output impedance transformation of 50/70 Omega. The measured and simulated results indicate good agreement.
URI: http://dx.doi.org/10.1109/TMTT.2018.2832040
http://hdl.handle.net/11536/145212
ISSN: 0018-9480
DOI: 10.1109/TMTT.2018.2832040
期刊: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume: 66
起始頁: 3277
結束頁: 3287
顯示於類別:期刊論文