Design of Artificial Lumped-Element Coplanar Waveguide Filters With Controllable Dual-Passband Responses

This study develops an analytical design methodology for synthesizing dual-passband filters with controllable frequency responses. The novel dual-passband filters are constructed from the artificial lumped-element coplanar waveguide stub whose behavior is equivalent to that of a parallel connection of series LC and shunt LC resonators. To improve the frequency response within two passbands, the impedance matching and the phase and impedance compensations are employed in filter design by attaching additional inductors and capacitors to dual-passband resonators. Two types of filters with significantly different bandwidth and separation of two passbands are implemented and the measured results are very consistent with the theoretical predictions, sufficiently validating the proposed design methodology and filter configuration. The proposed filters realized by artificial lumped-element resonators provide the advantages over conventional dual-passband filters in terms of compact size, spurious dc passband elimination, and deep suppression between two passbands.

[1]  F. De Flaviis,et al.  Dual-band planar quadrature hybrid with enhanced bandwidth response , 2006, IEEE Transactions on Microwave Theory and Techniques.

[2]  G. Macchiarella,et al.  Dual-Band Filters for Base Station Multi-Band Combiners , 2007, 2007 IEEE/MTT-S International Microwave Symposium.

[3]  Ruey-Beei Wu,et al.  Design of Dual- and Triple-Passband Filters Using Alternately Cascaded Multiband Resonators , 2006, IEEE Transactions on Microwave Theory and Techniques.

[4]  Chih-Ming Tsai,et al.  Planar filter design with fully controllable second passband , 2005, IEEE Transactions on Microwave Theory and Techniques.

[5]  Chu-Yu Chen,et al.  A simple and effective method for microstrip dual-band filters design , 2006, IEEE Microwave and Wireless Components Letters.

[6]  Yu-Chi Chang,et al.  A Novel Compact Dual-Mode Filter Using Cross-Slotted Patch Resonator for Dual-Band Applications , 2007, 2007 IEEE/MTT-S International Microwave Symposium.

[7]  Shau-Gang Mao,et al.  Asymmetric Dual-Passband Coplanar Waveguide Filters Using Periodic Composite Right/Left-Handed and Quarter-Wavelength Stubs , 2007, IEEE Microwave and Wireless Components Letters.

[8]  K. Vasudevan,et al.  A New Compact Microstrip-Fed Dual-Band Coplanar Antenna for WLAN Applications , 2006, IEEE Transactions on Antennas and Propagation.

[9]  K. Sarabandi,et al.  A Synthesis Method for Dual-Passband Microwave Filters , 2007, IEEE Transactions on Microwave Theory and Techniques.

[10]  W.J. Chappell,et al.  Dual-Band Lumped-Element Bandpass Filter , 2006, IEEE Transactions on Microwave Theory and Techniques.

[11]  Yo-Shen Lin,et al.  Novel compact parallel-coupled microstrip bandpass filters with lumped-element K-inverters , 2005, IEEE Transactions on Microwave Theory and Techniques.

[12]  C. Quendo,et al.  An original topology of dual-band filter with transmission zeros , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[13]  Tatsuo Itoh,et al.  Evolutionary generation of microwave line-segment circuits by genetic algorithms , 2000, 2000 30th European Microwave Conference.

[14]  Min-Hang Weng,et al.  Compact and Low Loss Dual-Band Bandpass Filter Using Pseudo-Interdigital Stepped Impedance Resonators for WLANs , 2007, IEEE Microwave and Wireless Components Letters.

[15]  I. Pele,et al.  Dual-band power divider based on semiloop stepped-impedance resonators , 2003 .

[16]  Hong-Ming Lee,et al.  Dual-Band Filter Design With Flexible Passband Frequency and Bandwidth Selections , 2007, IEEE Transactions on Microwave Theory and Techniques.

[17]  T. Ishizaki,et al.  A miniaturized monolithic dual band filter using ceramic lamination technique for dual mode portable telephones , 1997, 1997 IEEE MTT-S International Microwave Symposium Digest.

[18]  T. Anada,et al.  Synthesis of dual-band bandpass filters using successive frequency transformations and circuit conversions , 2006, IEEE Microwave and Wireless Components Letters.

[19]  Shau-Gang Mao,et al.  Compact dual-passband filter using lumped-element coplanar waveguide resonators , 2007 .

[20]  J. Kuo,et al.  Design of microstrip bandpass filters with a dual-passband response , 2005, IEEE Transactions on Microwave Theory and Techniques.

[21]  G. Macchiarella,et al.  Design techniques for dual-passband filters , 2005, IEEE Transactions on Microwave Theory and Techniques.

[22]  Shyh-Kang Jeng,et al.  Compact microstrip dual-band bandpass filters design using genetic-algorithm techniques , 2006, IEEE Transactions on Microwave Theory and Techniques.

[23]  Shau-Gang Mao,et al.  Design of Composite Right/Left-Handed Coplanar-Waveguide Bandpass and Dual-Passband Filters , 2006, IEEE Transactions on Microwave Theory and Techniques.

[24]  Shih-Cheng Lin,et al.  Novel coplanar-waveguide bandpass filters using loaded air-bridge enhanced capacitors and broadside-coupled transition structures for wideband spurious suppression , 2006, IEEE Transactions on Microwave Theory and Techniques.

[25]  Kiat Seng Yeo,et al.  A 1.8-V 2.4/5.15-GHz dual-band LCVCO in 0.18-/spl mu/m CMOS technology , 2006 .

[26]  J. Bonache,et al.  Design of Wide-Band Semi-Lumped Bandpass Filters Using Open Split Ring Resonators , 2007, IEEE Microwave and Wireless Components Letters.

[27]  W. Menzel,et al.  Quasi-lumped suspended stripline filters and diplexers , 2005, IEEE Transactions on Microwave Theory and Techniques.