To Optimally Design Microstrip Nonuniform Transmission Lines as Lowpass Filters

A method is proposed to optimally design the Microstrip Nonuniform Transmission Line (MNTLs) as lowpass filters. Some electrical and physical restrictions are used to design MNTLs. To optimally design the MNTLs, their strip width is expanded as truncated Fourier series, firstly. Then, the optimum values of the coefficients of the series are obtained through an optimization approach. The performance of the proposed structure is studied by design and fabrication of two lowpass filters of cutoff frequency 2.0 GHz.

[1]  Design, simulation, and fabrication of tapered microstrip filters by applying the method of small reflections , 2008, 2008 International Symposium on Telecommunications.

[2]  R. B. Wilcox,et al.  Arbitrary pulse shape synthesis via nonuniform transmission lines , 1990 .

[3]  Mohammad Khalaj-Amirhosseini.  Analysis of nonuniform transmission lines using Fourier series expansion , 2007 .

[4]  Jia-Sheng Hong,et al.  Microstrip filters for RF/microwave applications , 2001 .

[5]  Ke Lu.  An efficient method for analysis of arbitrary nonuniform transmission lines , 1997 .

[6]  Graham Town,et al.  Design of microwave filters by inverse scattering , 1995 .

[7]  To Analyze The Nonuniform Transmission Lines By Cascading Short Linear , 2008, 2008 3rd International Conference on Information and Communication Technologies: From Theory to Applications.

[8]  Closed Form Solutions for Nonuniform Transmission Lines , 2008 .

[9]  M. Khalaj-Amirhosseini.  Analysis of Nonuniform Transmission Lines Using the Method of Moments , 2007, 2007 Asia-Pacific Microwave Conference.

[10]  Serge Toutain,et al.  The continuously varying transmission-line technique - application to filter design , 1999 .

[11]  Mohammad Khalaj-Amirhosseini,et al.  ANALYSIS OF COUPLED OR SINGLE NONUNIFORM TRANSMISSION LINES USING STEP-BY-STEP NUMERICAL INTEGRATION , 2006 .

[12]  Jr. R. Wyndrum.  Microwave filters, impedance-matching networks, and coupling structures , 1965 .

[13]  V. K. Tripathi,et al.  Nonuniformly coupled microstrip transversal filters for analog signal processing , 1991 .

[14]  Mohammad Khalaj-Amirhosseini,et al.  Analysis of nonuniform transmission lines using Taylor's series expansion , 2006 .

[15]  Mohammad Khalaj-Amirhosseini.  Analysis of Nonuniform Transmission Lines Using the Equivalent Sources , 2007 .

[16]  R. Kaul,et al.  Microwave engineering , 1989, IEEE Potentials.

[17]  R. N. Ghose,et al.  Exponential Transmission Lines as Resonators and Transformers , 1957 .

[18]  C.C.H. Tang.  Delay Equalization by Tapered Cutoff Waveguides , 1964 .