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http://dx.doi.org/10.5515/KJKIEES.2009.20.5.444

A New Dual Band Branch Line Hybrid Coupler with Arbitrary Power Division Ratio  

Kim, Kwi-Soo (Department of Electrical and Communication Engineering, Soonchunhyang University)
Gwon, Chil-Hyeun (Department of Electrical and Communication Engineering, Soonchunhyang University)
Dorjsuren, Baatarkhuu (Department of Electrical and Communication Engineering, Soonchunhyang University)
Lim, Jong-Sik (Department of Electrical and Communication Engineering, Soonchunhyang University)
Ahn, Dal (Department of Electrical and Communication Engineering, Soonchunhyang University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.20, no.5, 2009 , pp. 444-449 More about this Journal
Abstract
This paper presents the design of a dual band branch line hybrid coupler(BLHC) with different power division ratios at two bands. In the proposed design, transmission lines of the BLHC are transformed to $\pi$-type equivalent circuits which represent different impedances and $\lambda/4$ electrical length at two frequency bands. In order to verify the proposed method, a dual band coupler with different power division ratios is designed for 0.9 GHz and 2 GHz applications. The desired power division ratios are 1:1 and 1:3 at the two operating frequency bands. The measured results show excellent performance with an insertion loss of less than 0.33 dB, a return loss of less than -18.07 dB, and good isolation characteristics.
Keywords
Dual Band Coupler; Branch Line Hybrid Coupler; Unequal Power Divider;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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