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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2013-08-21
Generalized Impedance-Transforming Dual-Band Branch-Line Couplers for Arbitrary Coupling Levels
By
Qiang Liu,

    Dr. Qiang Liu

    School of Electronic Engineering

    Beijing University of Posts and Telecommunications

    China

    Homepage

Yuan'an Liu,

    Dr. Yuan'an Liu

    School of Telecommunication Engineering,

    Beijing University of Posts and Telecommunications

    China

    Homepage

Yongle Wu,

    Prof. Yongle Wu

    School of Electronic Engineering

    Beijing University of Posts and Telecommunications

    China

    Homepage

Jun-Yu Shen,

    Dr. Jun-Yu Shen

    School of Electronic Engineering

    Beijing University of Posts and

    China

    Homepage

Shulan Li,

    Dr. Shulan Li

    School of Electronic Engineering

    Beijing University of Posts and Telecommunications

    China

    Homepage

Cuiping Yu,

    Dr. Cuiping Yu

    School of Telecommunication Engineering

    Beijing University of Posts and Telecommunications

    China

    Homepage

Ming Su

    Dr. Ming Su

    School of Electronic Engineering

    Beijing University of Posts and Telecommunications

    China

    Homepage

Progress In Electromagnetics Research B, Vol. 53, 399-415, 2013
doi:10.2528/PIERB13061717 | Google Scholar

Abstract
High-performance dual-band Doherty power amplifier and non-uniform circularlypolarizedantenna array require impedance-transformingunequal dual-band 90° branch-line couplers forpower dividing and phase shiftingin the feed networks.In this paper, an analytical design methodology of generalized impedance-transforming dual-band branch-line couplers for arbitrary coupling levels is proposed. The coupler features wide range of realizable frequency ratio, multiple flexibleselections of open- or short-circuited and pi- or T-network topologies. For demonstration, four numerical examples with different parameters are presented.Furthermore, two microstrip couplers based on open-circuited pi- and T-network topologies were fabricated and measured.The measured results show good performance at dual 1.8/3.45 GHz bands.Thefractional bandwidthsdefined by the fluctuation of the coupling level and the phase difference less than ±0.5 dB and ±5°are up to 17% and 18%, 18% and 2% for open-circuited pi- and T-network topologies, respectively.
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Citation
Qiang Liu, Yuan'an Liu, Yongle Wu, Jun-Yu Shen, Shulan Li, Cuiping Yu, and Ming Su, "Generalized Impedance-Transforming Dual-Band Branch-Line Couplers for Arbitrary Coupling Levels," Progress In Electromagnetics Research B, Vol. 53, 399-415, 2013.
doi:10.2528/PIERB13061717
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