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Compact Microstrip Quasi-Elliptic Bandpass Filter Using Open-Loop Dumbbell Shaped Defected Ground Structure

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3 Author(s)
Sio-Weng Ting ; Wireless Commun. Lab., Macau Univ., Macao ; Tam, Kam-Weng ; Martins, R.P.

A novel square open-loop dumbbell-shaped defected ground structure (DGS) unit is proposed. This unit provides a quasi-elliptic bandpass characteristic and the two transmission zeros near the passband edges can be controlled by the dimensions of DGS. Two quasi-elliptic bandpass filters using one and two DGS units; centered at 1.5 GHz were designed and implemented. Both the simulation and experimental results show that the DGS filter response is in good accordance with ideal quasi-elliptic model. The prototype filter with two DGS units yields higher order quasi-elliptic filtering and reports the measured 0.72 dB as insertion loss, 34 dB as matching, 51.8 % fractional bandwidth and about 20 dB stopband attenuation up to 10 GHz

Published in:

Microwave Symposium Digest, 2006. IEEE MTT-S International

Date of Conference:

11-16 June 2006