Compact DSPSL ultra-wideband bandpass filter based on transversal signal-interaction concepts

A compact ultra-wideband (UWB) bandpass filter (BPF) based on transversal signal-interaction concepts is proposed in this letter. Two transmission paths with a wideband double-sided parallel-strip line (DSPSL) 180° swap and a 3λ/4 transmission line are used to transmit signal from Port 1 to Port 2. Two λ/4 shorted lines are introduced to improve the passband transmission characteristic. Two transmission zeros and good harmonic suppression can be achieved in the whole band. One prototype with 3-dB fractional bandwidth of 108% (1.35-4.6 GHz) is fabricated for demonstration, and good agreement is observed between simulated and measured performances.

[1]  Man-Long Her,et al.  Dual‐mode and three‐transmission‐zeros bandstop filters with closed‐loop ring resonators , 2005 .

[2]  Wenjie Feng,et al.  Ultra-wideband bandpass filter using broadband planar Marchand balun , 2011 .

[3]  Quan Xue,et al.  Wideband Parallel-Strip Bandpass Filter Using Phase Inverter , 2008, IEEE Microwave and Wireless Components Letters.

[4]  Ching-Wen Tang,et al.  A Microstrip Ultra-Wideband Bandpass Filter With Cascaded Broadband Bandpass and Bandstop Filters , 2007, IEEE Transactions on Microwave Theory and Techniques.

[5]  J. Bonache,et al.  Application of Electromagnetic Bandgaps to the Design of Ultra-Wide Bandpass Filters With Good Out-of-Band Performance , 2006, IEEE Transactions on Microwave Theory and Techniques.

[6]  Zhen-Yu Zhang,et al.  Improved wide-band Schiffman phase shifter , 2006 .

[7]  C. Rauscher,et al.  Microwave Active Filters Based on Transversal and Recursive Principles , 1985 .

[8]  Ke Wu,et al.  On the design of novel compact broad-band planar filters , 2003 .

[9]  B. Gao,et al.  Improved Miniaturized Wide-Band 90-Degree Schiffman Phase Shifter , 2009 .

[10]  E. M. Jones,et al.  Microwave Filters, Impedance-Matching Networks, and Coupling Structures , 1980 .

[11]  G. Torregrosa-Penalva,et al.  Compact UWB Bandpass Filter Based on Signal Interference Techniques , 2009, IEEE Microwave and Wireless Components Letters.

[12]  Ian D. Robertson,et al.  Analysis and design of impedance-transforming planar Marchand baluns , 2001 .

[13]  W. Menzel,et al.  Ultra-wideband (UWB) bandpass filters using multiple-mode resonator , 2005, IEEE Microwave and Wireless Components Letters.

[14]  Wenquan Che,et al.  Novel Ultra-Wideband Bandpass Filter Using Shorted Coupled Lines and Transversal Transmission Line , 2010, IEEE Microwave and Wireless Components Letters.

[15]  J.I. Alonso,et al.  Design of sharp-rejection and low-loss wide-band planar filters using signal-interference techniques , 2005, IEEE Microwave and Wireless Components Letters.

[16]  Quan Xue,et al.  Compact wideband differential bandpass filter based on the double-sided parallel-strip line and transversal signal-interaction concepts , 2012 .

[17]  Y.-H. Wang,et al.  Planar Ultra-Wideband Bandpass Filter Using Edge Coupled Microstrip Lines and Stepped Impedance Open Stub , 2007, IEEE Microwave and Wireless Components Letters.

[18]  R. Gomez-Garcia,et al.  Using the branch-line directional coupler in the design of microwave bandpass filters , 2005, IEEE Transactions on Microwave Theory and Techniques.