A Possible Simple Structure for Variable Microwave Inductors and Their Filter Applications

Norio IMAI  Kazuhiko HONJO  Akira SAITOU  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E87-C    No.1    pp.113-115
Publication Date: 2004/01/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
Keyword: 
variable inductors,  filter,  MEMS,  variable bandwidth,  

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Summary: 
A new concept of changing inductance values has been proposed, where a part of meander inductor is short circuited to reduce effective line length. Microwave characteristics of the short-circuited meander inductors and the meander inductor without the short circuit have been designed and fabricated on resin circuit boards. The reduction of inductance values by 40% has been successfully realized for the microwave frequency range from 0.5 GHz to 5 GHz for both designed and measured results. Using the proposed structure, low pass filters having two different cut-off frequencies have been designed and tested. Measured cut-off frequency changed 3.0 GHz to 4.2 GHz.