| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain large bandwidth variation even when an angle width within which a position of a ground angle to an annular line is changed is small. Ž<P>SOLUTION: A resonator is variable in bandwidth while keeping the resonance frequency constant, two annular lines (11, 12) differing in peripheral length are disposed concentrically and connected to each other at equal angle intervals by three or more connection lines (21 to 24). A plurality of switch elements have one-end sides connected to the annular lines (11, 12) peripherally at equal angle intervals and other-end sides grounded, and while a switch element corresponding to a desired bandwidth is selected and turned on, the others are turned off to constitute a variable-bandwidth resonator. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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