A compact bandpass filter using a 1-D periodic slow wave structure

A compact, dual-mode bandpass filter based on a stripline ring resonator is presented. This 2-pole filter was implemented using a one-dimensional periodic structure, such that the physical length of the ring resonator was decreased due to the slow wave effect. At a center frequency of 2 GHz, the length of the ring was reduced by 41.8%, and the overall footprint of the filter was reduced by 51.9%. With the periodic structure, this filter achieved 0.6 dB of loss centered in a 310 MHz bandwidth, compared to 1 dB of loss centered in a 230 MHz bandwidth achieved without the slow wave structure.

[1]  Joseph W. Haus,et al.  Photonic Band Gap Structures , 2004 .

[2]  T. Itoh,et al.  Leakage suppression in stripline circuits using a 2-D photonic bandgap lattice , 1999, 1999 IEEE MTT-S International Microwave Symposium Digest (Cat. No.99CH36282).

[3]  Ke Wu,et al.  New planar dual-mode filter using cross-slotted patch resonator for simultaneous size and loss reduction , 1999 .

[4]  Tatsuo Itoh,et al.  Novel 2-D photonic bandgap structure for microstrip lines , 1998 .

[5]  F. Miranda,et al.  Miniaturized HTS/dielectric multilayer filters for satellite communications , 1997, IEEE Transactions on Applied Superconductivity.

[6]  A. Gorur,et al.  A novel coplanar slow-wave structure , 1994, IEEE Microwave and Guided Wave Letters.

[7]  S. J. Fiedziuszko,et al.  Multi-layered planar filters based on aperture coupled, dual mode microstrip or stripline resonators , 1992, 1992 IEEE Microwave Symposium Digest MTT-S.

[8]  S. J. Fiedziuszko,et al.  Miniature dual mode microstrip filters , 1991, 1991 IEEE MTT-S International Microwave Symposium Digest.

[9]  James B. Beyer,et al.  MESFET Distributed Amplifier Design Guidelines , 1984 .