论文信息 - A novel design of 3-dB coupler with harmonics suppression using Powell's least square method

A novel design of 3-dB coupler with harmonics suppression using Powell's least square method

This article presents a simplified design of a compact structure with harmonics suppression. The suggested structure is based on a conventional 3-dB branch line coupler, and two pairs of open stubs are adopted at the λ/4 branches to suppress harmonics. With this configuration, two finite attenuation poles will be available, which are able to suppress the second and third harmonics simultaneously. A model of transmission line is introduced for tuning the finite attenuation poles, and the optimal condition could be achieved by using Powell's least square method. To assess the effectiveness of the proposed structure, a novel 3-dB coupler with harmonics suppression is designed, fabricated, and measured. The numerical results demonstrate an excellent match between the numerical analysis and actual measurements. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26171

Dong Il Kim | Rui Li | Qiang Yang | Duo-Long Wu

[1] Bongkoo Kang,et al. Modified Wilkinson power divider for nth harmonic suppression , 2003 .

[2] Kai Chang,et al. Compact lowpass filter using stepped impedance hairpin resonator , 2001 .

[3] R. Levy,et al. Synthesis of Symmetrical Branch-Guide Directional Couplers , 1968 .

[4] C. Y. Pon. Hybrid-Ring Directional Coupler for Arbitrary Power Divisions , 1961 .

[5] E. J. Wilkinson. An N-Way Hybrid Power Divider , 1960 .

[6] Dong Il Kim,et al. Compact Structure With Three Attenuation Poles for Improving Stopband Characteristics , 2006, IEEE Microwave and Wireless Components Letters.

[7] M. J. D. Powell,et al. A Method for Minimizing a Sum of Squares of Non-Linear Functions Without Calculating Derivatives , 1965, Comput. J..

[8] Yongle Wu,et al. An Unequal Wilkinson Power Divider for a Frequency and Its First Harmonic , 2008, IEEE Microwave and Wireless Components Letters.