A TRI-BAND IMPEDANCE TRANSFORMER USING STUBBED COUPLING LINE

In this paper, a compact tri-band impedance transformer by utilizing stubbed coupling line for matching a load at three arbitrary frequencies is proposed. The transformer is composed of two parts, and each part is constructed from parallel-coupled transmission lines. Two structures with difierent conflgurations of the proposed transformer have been given and analyzed. Then, the close-form equations for the transformer parameters are derived analytically, and the corresponding analytical design approach is verifled by numerical examples. To certify the validity of design formulas, an impedance transformer is fabricated and measured at 0.9/1.8/3.2GHz. Good experimental performances at each frequency are obtained, which are in good agreement with the simulated results.

[1]  E.M.T. Jones,et al.  Coupled-Strip-Transmission-Line Filters and Directional Couplers , 1956 .

[2]  C. Monzon.  Analytical derivation of a two-section impedance transformer for a frequency and its first harmonic , 2002, IEEE Microwave and Wireless Components Letters.

[3]  Y.L. Chow,et al.  A transformer of one-third wavelength in two sections - for a frequency and its first harmonic , 2002, IEEE Microwave and Wireless Components Letters.

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

[5]  P. Colantonio,et al.  A new approach to design matching networks with distributed elements , 2004, 15th International Conference on Microwaves, Radar and Wireless Communications (IEEE Cat. No.04EX824).

[6]  R. Phromloungsri,et al.  Analysis and design of a three-section transmission-line transformer , 2005, IEEE Transactions on Microwave Theory and Techniques.

[7]  Lucio Scucchia.  Closed-form approach to design distributed matching networks for high-frequency amplifiers , 2006 .

[8]  P. Colantonio,et al.  A new design strategy for multi frequencies passive matching networks , 2007, 2007 European Microwave Conference.

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

[10]  Vincenzo Fiumara,et al.  An exact synthesis method for dual-band chebyshev impedance transformers , 2008 .

[11]  K.-K.M. Cheng,et al.  A New Approach to the Realization of a Dual-Band Microstrip Filter With Very Wide Upper Stopband , 2008, IEEE Transactions on Microwave Theory and Techniques.

[12]  Xiao-Qun Chen,et al.  A compact three-way dual-frequency power divider , 2009 .

[13]  Fan Wu,et al.  A Three-Section Dual-Band Transformer for Frequency-Dependent Complex Load Impedance , 2009, IEEE Microwave and Wireless Components Letters.

[14]  Yongle Wu,et al.  A Dual Band Unequal Wilkinson Power Divider Without Reactive Components , 2009, IEEE Transactions on Microwave Theory and Techniques.

[15]  X.-W. Shi,et al.  Planar Dual-Frequency Power Divider using Umbrella-Shaped Resonator , 2010 .

[16]  Byungje Lee,et al.  Dual‐band design of single‐stub impedance matching networks with application to dual‐band stubbed T‐junctions , 2010 .

[17]  M. A. Nikravan,et al.  T-section dual-band impedance transformer for frequency-dependent complex impedance loads , 2011 .

[18]  Nihad Dib,et al.  Non-Uniform Transmission Line Transformers and Their Application in the Design of Compact Multi-Band Bagley Power Dividers with Harmonics Suppression , 2011 .

[19]  Yongle Wu,et al.  AN UNEQUAL COUPLED-LINE WILKINSON POWER DIVIDER FOR ARBITRARY TERMINATED IMPEDANCES , 2011 .

[20]  Xiao-Wei Shi,et al.  Design of Compact Quad-Frequency Impedance Transformer Using Two-Section Coupled Line , 2012, IEEE Transactions on Microwave Theory and Techniques.

[21]  X. Lin,et al.  Improved CRLH-TL with Arbitrary Characteristic Impedance and its Application in Hybrid Ring Design , 2012 .

[22]  Y. Liu,et al.  Lumped Dual-Frequency Impedance Transformers for Frequency-Dependent Complex Loads , 2012 .

[23]  Noh-Hoon Myung,et al.  A DUAL-BAND IMPEDANCE TRANSFORMING TECHNIQUE WITH LUMPED ELEMENTS FOR FREQUENCY-DEPENDENT COMPLEX LOADS , 2013 .

[24]  Yongle Wu,et al.  A Novel Compact Dual-Frequency Coupled-Line Transformer with Simple Analytical Design Equations for Frequency-Dependent Complex Load Impedance , 2013 .