Title :
Compact bandpass filter with sharp cut-off using grooved parallel coupled microstrip lines
Author :
Marimuthu, J. ; Abbosh, Amin ; Henin, Bassem
Author_Institution :
Sch. of ITEE, Univ. of Queensland, St. Lucia, QLD, Australia
Abstract :
A compact novel bandpass filter with sharp cut-off frequency and two transmission zeros is proposed. To be compact in size, the proposed filter is constructed using L-shaped grooved parallel coupled microstrip line (PCML) with appropriate middle resonator and short circuited via. The via is introduced to initiate a sharp lower cut-off frequency with a transmission zero at a specific frequency. The design is further improved by placing a groove at the center of the PCML structure. The groove creates sharp upper cut-off frequency with a transmission zero at specific frequencies. The filter designed at the center frequencies 2.4 GHz with bandwidths of around 400 MHz and sharp cutoff bands with 50% reduction in overall size compared with the traditional design approach.
Keywords :
band-pass filters; microstrip filters; microwave filters; resonator filters; vias; L-shaped grooved parallel coupled microstrip lines; PCML structure; compact bandpass filter; frequency 2.4 GHz; middle resonator; sharp cut-off frequency; short circuited via; transmission zeros; Band-pass filters; Cutoff frequency; Filtering theory; Microstrip filters; Microwave filters; Resonant frequency; Resonator filters;
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4673-5315-1
DOI :
10.1109/APS.2013.6711055