%0 Journal Article
%T Design of Triple-Mode Bandpass Filter Using Improved Hexagonal Loop Resonator
%A Shao-Guo Mo
%A Zhi-Yuan Yu
%A Long Zhang
%J PIER
%@ 1070-4698
%D 2009
%I 
%R 10.2528/PIER09080304
%X A novel triple-mode hexagonal bandpass filter with capacitive loading stubs is introduced in this article. The technique, adding an open capacitive stub, is applied to enlarge the equivalent self-capacitance of the resonator, which declines its resonant frequencies. Three radial-line stubs in the center of top layer are used to implement this technique. One mode resonant frequency is varied with the radii of three radial-line stubs, while the other two modes are nearly not affected. This filter has a pair of transmission zeros which are close to the passband, thus it behaves with high selectivity. For method validation, a bandpass filter operating at 2.4 GHz is fabricated and measured. The experimental results are demonstrated and discussed.
%U http://www.jpier.org/pier/pier.php?paper=09080304