TY - JOUR
T1 - A Dual-Band Port Extended Branch-Line Coupler and Mitigation of the Band-Ratio and Power Division Limitations
AU - Maktoomi, Mohammad A.
AU - Hashmi, Mohammad S.
AU - Ghannouchi, Fadhel M.
N1 - Funding Information:
This work was supported in part by the Overseas Research Fellowship Scheme of IIIT Delhi, in part by the NSERC Discovery Grant, in part by the Canada Research Chair Grant, and in part by the Alberta Innovate Technology Futures Chair Grant.
Publisher Copyright:
© 2017 IEEE.
PY - 2017/8/5
Y1 - 2017/8/5
N2 - In this paper, enhanced designs of port-extended branch-line coupler (BLC) are presented. Initially, the analysis of the conventional dual-band port-extended equal-division BLC is presented to deduce its operation from Riblet's viewpoint. Subsequently, it is shown that extending the Riblet's concept to dual-band design results in a novel dual-band BLC with arbitrary power division ratios. It has also been identified that the proposed design possesses a free design variable that allows realization of BLC with higher band-ratio. Furthermore, another BLC structure, capable of achieving enhanced band-ratio, utilizing two-section transmission line at each port is also proposed. All the reported design equations are in closed form and are very simple and do not go beyond a second-degree polynomial. The effectiveness of the proposed technique is demonstrated through test cases for equal and unequal power division ratio and for numerous band-ratio (= f2/f1). The good agreement between the electromagnetic simulated results and the measured results from the two unequal power division BLC prototypes, on Rogers RO4003C substrate, operating at 1.2 GHz/2.52 GHz and 1 GHz/2 GHz validate the proposed approach.
AB - In this paper, enhanced designs of port-extended branch-line coupler (BLC) are presented. Initially, the analysis of the conventional dual-band port-extended equal-division BLC is presented to deduce its operation from Riblet's viewpoint. Subsequently, it is shown that extending the Riblet's concept to dual-band design results in a novel dual-band BLC with arbitrary power division ratios. It has also been identified that the proposed design possesses a free design variable that allows realization of BLC with higher band-ratio. Furthermore, another BLC structure, capable of achieving enhanced band-ratio, utilizing two-section transmission line at each port is also proposed. All the reported design equations are in closed form and are very simple and do not go beyond a second-degree polynomial. The effectiveness of the proposed technique is demonstrated through test cases for equal and unequal power division ratio and for numerous band-ratio (= f2/f1). The good agreement between the electromagnetic simulated results and the measured results from the two unequal power division BLC prototypes, on Rogers RO4003C substrate, operating at 1.2 GHz/2.52 GHz and 1 GHz/2 GHz validate the proposed approach.
KW - Coupler
KW - dual-band
KW - microstrip
KW - multiband
KW - unequal power division
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U2 - 10.1109/TCPMT.2017.2661864
DO - 10.1109/TCPMT.2017.2661864
M3 - Article
AN - SCOPUS:85016512165
SN - 2156-3950
VL - 7
SP - 1313
EP - 1323
JO - IEEE Transactions on Components, Packaging and Manufacturing Technology
JF - IEEE Transactions on Components, Packaging and Manufacturing Technology
IS - 8
M1 - 7866850
ER -