Novel Pi‐type stepped‐impedance‐stub branch line and its application to dual‐band power divider with high suppression of intermediate frequencies

A novel Pi-type branch line is constructed by using two shunt stepped-impedance stubs in this paper. Introducing the stepped-impedance stubs increases design degrees of freedom of this Pi-type line. This structure can be used to replace arbitrary single-section transmission line in microwave components. Meanwhile, by selecting proper parameters according to the given analytical theory, arbitrary dual-band operations can be realized. To verify the feature of this proposed structure, a dual-band (1.1 and 1.65 GHz) 3-dB Wilkinson power divider with measured 50-dB suppression at the mid band of 1.45 GHz is presented. Finally, experimental results verify the theoretical analysis. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2360–2363, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26266

[1]  M. Berroth,et al.  A dual-frequency wilkinson power divider , 2006, IEEE Transactions on Microwave Theory and Techniques.

[2]  Ashraf S. Mohra,et al.  Compact dual band Wilkinson power divider , 2008, National Radio Science Conference.

[3]  C. Monzon.  A small dual-frequency transformer in two sections , 2003 .

[4]  T. Itoh,et al.  Arbitrary dual-band components using composite right/left-handed transmission lines , 2004, IEEE Transactions on Microwave Theory and Techniques.

[5]  Byungje Lee,et al.  A Dual-Band Wilkinson Power Divider , 2008, IEEE Microwave and Wireless Components Letters.

[6]  Jen-Tsai Kuo,et al.  New miniaturized dual-band rat-race coupler with microwave C-sections , 2009, 2009 IEEE MTT-S International Microwave Symposium Digest.

[7]  K.-K.M. Cheng,et al.  A novel approach to the design and implementation of dual-band compact planar 90/spl deg/ branch-line coupler , 2004, IEEE Transactions on Microwave Theory and Techniques.

[8]  Kuo-Sheng Chin,et al.  Compact Dual-Band Branch-Line and Rat-Race Couplers With Stepped-Impedance-Stub Lines , 2010, IEEE Transactions on Microwave Theory and Techniques.

[9]  Jen-Tsai Kuo,et al.  Miniaturized Dual-Band Hybrid Couplers With Arbitrary Power Division Ratios , 2009, IEEE Transactions on Microwave Theory and Techniques.

[10]  K.J. Chen,et al.  A Stub Tapped Branch-Line Coupler for Dual-Band Operations , 2007, IEEE Microwave and Wireless Components Letters.

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

[12]  Jia-Sheng Hong,et al.  Compact wide-band branch-line hybrids , 2006 .

[13]  K.-K.M. Cheng,et al.  A Novel Approach to the Design and Implementation of Dual-Band Power Divider , 2008, IEEE Transactions on Microwave Theory and Techniques.