Waveguide bandpass filter having a ladder shape metal plate and which is tunable using a rotatable dielectric plate
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United States of America Patent
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Mar 7, 2017
Grant Date -
Jun 4, 2015
app pub date -
Apr 18, 2013
filing date -
Jun 12, 2012
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Abstract
Provided is a bandpass filter (10), including: a filter casing (17) defining a rectangular waveguide (11) having a narrow plane (a) and a broad plane (b); a metal plate (12) having a ladder shape and being arranged in a sandwiched manner inside the filter casing (17) at a center of the broad plane (b) so as to be parallel to the narrow plane (a); a dielectric plate (13) positioned in a vicinity of the metal plate (12); a support rod (14) extending in parallel to a longitudinal direction of the rectangular waveguide (11), the support rod (14) being rotatably supported on the filter casing (17) and configured to support the dielectric plate (13); and a first gear (15) fixed at a tip of the support rod (14). The dielectric plate (13) is rotated along with rotation of the first gear (15), to thereby adjust a bandpass frequency.
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