Open AccessDESIGN OF TRIPLE-MODE BANDPASS FILTER USING IMPROVED HEXAGONAL LOOP RESONATOR
Author(s) -
ShaoGuo Mo,
Zhiyuan Yu,
Long Zhang
Publication year - 2009
Publication title -
electromagnetic waves
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 89
eISSN - 1559-8985
pISSN - 1070-4698
DOI - 10.2528/pier09080304
Subject(s) - band pass filter , loop (graph theory) , resonator , hexagonal crystal system , materials science , mode (computer interface) , filter (signal processing) , control theory (sociology) , acoustics , optoelectronics , physics , optics , computer science , engineering , mathematics , electrical engineering , chemistry , crystallography , control (management) , combinatorics , artificial intelligence , operating system
A novel triple-mode hexagonal bandpass fllter 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 afiected. This fllter has a pair of transmission zeros which are close to the passband, thus it behaves with high selectivity. For method validation, a bandpass fllter operating at 2.4GHz is fabricated and measured. The experimental results are demonstrated and discussed.
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