UWB Bandpass Filter Using Cascaded Miniature High-Pass and Low-Pass Filters With Multilayer Liquid Crystal Polymer Technology

This paper presents a new ultra-wideband (UWB) bandpass filter that is formed by cascading miniature high-pass and low-pass filters implemented with multilayer liquid crystal polymer technology. The miniature high-pass and low-pass filters can be designed independently and the design procedures are described. Experiments are carried out to validate the designs. Small sizes for the fabricated high-pass filter, low-pass filter, and UWB bandpass filter are achieved, which are 4.0 mm × 4.4 mm (0.162 ¿g × 0.178 ¿g), 4.56 mm × 4.9 mm (0.185 ¿g × 0.198 ¿g) and 5.1 mm × 8.86 mm (0.207 ¿g X 0.359 ¿g), respectively, where ¿g is the guided wavelength at 6.85 GHz. Excellent performance is obtained for all the measured filters, including low insertion losses and high selectivity. Due to its simple structure and excellent performance, the proposed UWB bandpass filter is favorable for practical UWB communication and radar systems.

[1]  Ching-Wen Tang,et al.  Realization of Multilayered Wide-Passband Bandpass Filter With Low-Temperature Co-Fired Ceramic Technology , 2008, IEEE Transactions on Microwave Theory and Techniques.

[2]  Fu-Chieh Hsu,et al.  Microstrip bandpass filters for Ultra-Wideband (UWB) wireless communications , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[3]  J. Laskar,et al.  Compact planar and vialess composite low-pass filters using folded stepped-impedance resonator on liquid-Crystal-polymer substrate , 2005, IEEE Transactions on Microwave Theory and Techniques.

[4]  Shih-Cheng Lin,et al.  Compact Ultra-Wideband Bandpass Filters Using Composite Microstrip–Coplanar-Waveguide Structure , 2006, IEEE Transactions on Microwave Theory and Techniques.

[5]  Zhang-Cheng Hao,et al.  Ultra-Wideband Bandpass Filter Using Multilayer Liquid-Crystal-Polymer Technology , 2008, IEEE Transactions on Microwave Theory and Techniques.

[6]  W. Menzel,et al.  Ultra-wideband bandpass filter with hybrid microstrip/CPW structure , 2005, IEEE Microwave and Wireless Components Letters.

[7]  Jia-Sheng Hong,et al.  A Novel Ultra-Wideband (UWB) Bandpass Filter (BPF) With Pairs of Transmission Zeroes , 2007, IEEE Microwave and Wireless Components Letters.

[8]  Jia-Sheng Hong,et al.  An optimum ultra‐wideband microstrip filter , 2005 .

[9]  G. Ponchak,et al.  Characterization of liquid crystal polymer (LCP) material and transmission lines on LCP substrates from 30 to 110 GHz , 2004, IEEE Transactions on Microwave Theory and Techniques.

[10]  K. Li,et al.  An ultrawideband bandpass filter using broadside-coupled microstrip-coplanar waveguide structure , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[11]  Lei Zhu,et al.  EBG-Embedded Multiple-Mode Resonator for UWB Bandpass Filter With Improved Upper-Stopband Performance , 2007, IEEE Microwave and Wireless Components Letters.

[12]  Yo-Shen Lin,et al.  A compact LTCC ultra-wideband bandpass filter using semi-lumped parallel-resonance circuits for spurious suppression , 2007, 2007 European Microwave Conference.

[13]  Young-Sik Kim,et al.  UWB Bandpass Filter Using Microstrip-to-CPW Transition With Broadband Balun , 2007, IEEE Microwave and Wireless Components Letters.

[14]  A.M. Abbosh.  Planar Bandpass Filters for Ultra-Wideband Applications , 2007, IEEE Transactions on Microwave Theory and Techniques.

[15]  Ming-Yu Hsieh,et al.  Compact and wideband microstrip bandstop filter , 2005, IEEE Microwave and Wireless Components Letters.

[16]  Yo-Shen Lin,et al.  Highly selective microstrip bandpass filters for ultra-wideband (UWB) applications , 2005, 2005 Asia-Pacific Microwave Conference Proceedings.

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

[18]  Chi-Hsueh Wang,et al.  A Compact Ultra-Wideband Bandpass Filter Based on Split-Mode Resonator , 2007, IEEE Microwave and Wireless Components Letters.

[19]  T. Anada,et al.  A Novel Compact Ultra-Wideband Bandpass Filter Using a Microstrip Stepped-Impedance Four-Modes Resonator , 2007, 2007 IEEE/MTT-S International Microwave Symposium.

[20]  Jia-Sheng Hong,et al.  Compact Ultra-Wideband Microstrip/Coplanar Waveguide Bandpass Filter , 2007, IEEE Microwave and Wireless Components Letters.

[21]  Lei Zhu,et al.  Stopband-Expanded Low-Pass Filters Using Microstrip Coupled-Line Hairpin Units , 2008, IEEE Microwave and Wireless Components Letters.

[22]  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.

[23]  W. Menzel,et al.  Low-loss ultra-wideband (UWB) filters using suspended stripline , 2005, 2005 Asia-Pacific Microwave Conference Proceedings.

[24]  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.

[25]  Yong Fan,et al.  Compact Ultra-Wideband Bandpass Filter Using Dual-Line Coupling Structure , 2009, IEEE Microwave and Wireless Components Letters.

[26]  Jia-Sheng Hong,et al.  Compact ultra-wideband bandpass filter using broadside coupled hairpin structures on multilayer liquid crystal polymer substrate , 2008 .

[27]  Jia-Sheng Hong,et al.  Ultra Wideband Bandpass Filter Using Embedded Stepped Impedance Resonators on Multilayer Liquid Crystal Polymer Substrate , 2008, IEEE Microwave and Wireless Components Letters.