Compact Wide Stopband Lowpass Filter with High Suppression Using Corrugated Transmission Line

[摘要] Compact and wide stopband lowpass filter with high suppression level using corrugated high impedance transmission line with symmetrically loaded multiple patch resonators is designed and demonstrated. The measured results validate the simulated characteristics and exhibit a roll-off of 60 dB/GHz and a wide stopband with suppression level better than 31 dB from 2.65 GHz to 13.4 GHz. The 3 dB cut-off frequency of the filter is at 2.04 GHz with passband insertion loss of 0.7 dB. The normalized circuit size of the developed filter is 0.21824 λg× 0.1314 λg, where λgis the guided wavelength of 80.646 mm at cutoff frequency for 50 ω impedance.

[发布机构] Division of Electronics, School of Engineering, Cochin University of Science and Technology, Kochi-22 Kerala, India^1

[关键词] Circuit size;High impedance;Measured results;Multiple patches;Pass bands;Roll offs;Suppression level;Wide stopband