Title :
Design of hexagonal filter with source-load coupling
Author :
Ni, D. ; Zhu, Y. ; Xie, Y.
Author_Institution :
Nat. Lab. of Antennas & Microwave Technol., Xidian Univ., Xi´´an
Abstract :
A method for synthesising a novel hexagonal filter with source-load coupling is presented. The equivalent circuit of the lowpass prototype of a general lossless coupled resonator filter is proposed, and the corresponding transfer function t(s) is derived. A novel quasi-elliptic function microstrip hexagonal filter is designed and fabricated. Simulated and measured results are presented. Compared with the conventional cross-coupling filter, the proposed hexagonal filter acquires more than 27.5% size reduction and provides improved selectivity by a relatively small bandwidth
Keywords :
band-pass filters; coupled circuits; elliptic filters; equivalent circuits; microstrip filters; resonator filters; cross coupling filter; equivalent circuit; hexagonal filter; lowpass prototype; microstrip filter; quasielliptic filter; resonator filter; source-load coupling; transfer function;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20062674
