Novel Dual-Band Coupled-Line Quadrature Couplers with Unequal Power Division

ABSTRACT A dual-band coupled-line 90° unequal coupler is proposed in this paper. It is simply composed of three pairs of coupled lines and four port extensions. Analytical design methodology and detailed design guidance are given, which significantly simplifies the design procedure. Due to the utilization of coupled lines, the proposed coupler possesses tight circuit configuration, and since the degree of freedom is increased for the even- and odd-mode characteristic impedances, the coupled lines enable the dual-band operation. Meanwhile, the coupler can operate with unequal power division. Furthermore, the employment of port extensions eliminates the additional insertion loss caused by additional port lines. Eventually, two prototypes of the proposed coupler are designed and fabricated. The good agreement between the expected and measured results confirms the design methodology in this work to be correct and effective.

[1]  Ke-Li Wu,et al.  A Dual-Band Coupled-Line Coupler With an Arbitrary Coupling Coefficient , 2012, IEEE Transactions on Microwave Theory and Techniques.

[2]  Steven Gao,et al.  Novel dual-band antenna with simultaneous linear and circular polarizations , 2014, 2014 Loughborough Antennas and Propagation Conference (LAPC).

[3]  L. Yeung,et al.  A Compact Dual-Band 90° Coupler With Coupled-Line Sections , 2011, IEEE Transactions on Microwave Theory and Techniques.

[4]  Yucheng Liu,et al.  A Concurrent Dual-Band Uneven Doherty Power Amplifier with Frequency-Dependent Input Power Division , 2014, IEEE Transactions on Circuits and Systems I: Regular Papers.

[5]  Pei-Ling Chi,et al.  Miniaturized branch-line coupler with coupling-dependent dual-frequency operation , 2013, 2013 Asia-Pacific Microwave Conference Proceedings (APMC).

[6]  Byungje Lee,et al.  Dual-Band Branch-Line Coupler With Port Extensions , 2010, IEEE Transactions on Microwave Theory and Techniques.

[7]  Jin Pan,et al.  The new design of miniaturized dual-band 180° hybrid-ring coupler , 2012, 2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition.

[8]  P. Colantonio,et al.  Branch-Line Coupler Design Operating in Four Arbitrary Frequencies , 2012, IEEE Microwave and Wireless Components Letters.

[9]  Pei-Ling Chi,et al.  Design of Dual-Band Coupler With Arbitrary Power Division Ratios and Phase Differences , 2014, IEEE Transactions on Microwave Theory and Techniques.

[10]  Qing-Xin Chu,et al.  Design of Dual-band Filtering Quadrature Coupler Using λ/2 and λ/4 Resonators , 2012 .

[11]  Shao Yong Zheng,et al.  Quasi-Arbitrary Phase-Difference Hybrid Coupler , 2012, IEEE Transactions on Microwave Theory and Techniques.

[12]  Quan Xue,et al.  Miniaturized Arbitrary Phase-Difference Couplers for Arbitrary Coupling Coefficients , 2013, IEEE Transactions on Microwave Theory and Techniques.

[13]  Yongle Wu,et al.  Comments on “Quasi-Arbitrary Phase-Difference Hybrid Coupler” , 2013, IEEE Transactions on Microwave Theory and Techniques.

[14]  Yi-Hsin Pang,et al.  Design of a dual-band miniaturized 90° branch-line coupler with coupled lines , 2011, Asia-Pacific Microwave Conference 2011.

[15]  Feng Lin,et al.  A Novel Tri-Band Branch-Line Coupler With Three Controllable Operating Frequencies , 2010, IEEE Microwave and Wireless Components Letters.

[16]  K-K M. Cheng,et al.  A Novel Dual-Band 3-dB Branch-Line Coupler Design With Controllable Bandwidths , 2012, IEEE Transactions on Microwave Theory and Techniques.

[17]  Yucheng Liu,et al.  Compact dual-band branch-line and rat-race couplers with stepped coupled-line , 2011, 2011 China-Japan Joint Microwave Conference.

[18]  Feng Lin,et al.  Design of Dual-Band Filtering Quadrature Coupler Using $\lambda /2$ and $\lambda /4$ Resonators , 2012, IEEE Microwave and Wireless Components Letters.

[19]  Yuanan Liu,et al.  An Analytical Design Method for a Novel Dual-Band Unequal Coupler With Four Arbitrary Terminated Resistances , 2014, IEEE Transactions on Industrial Electronics.

[20]  Yi-Hsin Pang,et al.  Dual-Band Unequal-Power Quadrature Branch-Line Coupler With Coupled Lines , 2013, IEEE Microwave and Wireless Components Letters.