Title :
A study of narrow-band and compact size microstrip bandpass filters for wireless communications
Author :
Puttadilok, Duangporn ; Eungdamrong, Duangrat ; Tanacharoenwat, Watchanun
Author_Institution :
Thammasat Univ., Pathumthani
Abstract :
Coupled filter design covers the odd and even wave coupling of transmission lines, which results in odd and even characteristic line impedances. Cascading the parallel coupled-line sections gives rise to bandpass filter structures. Since conventional coupled-line filter is large in size, it is not suitable for wireless communications. Hairpin- comb and zig-zag filters were introduced to solve this disadvantage. These filters have narrow-band and compact size. This paper focuses on designing hairpin-comb and zig-zag filters at 1800 MHz and comparing their performances. The results show that a hairpin-comb microstrip filter has a better performance than a zig-zag microstrip filter in three categories, namely, return loss, size, and passband bandwidth.
Keywords :
band-pass filters; microstrip filters; bandpass filter structure; characteristic line impedance; compact size microstrip bandpass filter; coupled filter design; coupled-line filter; even wave coupling; hairpin-comb microstrip filter; narrow-band; odd wave coupling; parallel coupled-line section; passband bandwidth; transmission line; wireless communication; zig-zag microstrip filter; Attenuation; Band pass filters; Couplings; Frequency; Local area networks; Microstrip filters; Narrowband; Passband; Resonator filters; Wireless communication;
Conference_Titel :
SICE, 2007 Annual Conference
Conference_Location :
Takamatsu
Print_ISBN :
978-4-907764-27-2
Electronic_ISBN :
978-4-907764-27-2
DOI :
10.1109/SICE.2007.4421205