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United States of America Patent
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Issued Date -
Feb 26, 2015
app pub date -
Aug 22, 2014
filing date -
Aug 23, 2013
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Abstract
The antenna has a structure that the high frequency electrode is received in a dielectric case. The high frequency electrode has a go-and-return conductor structure that two electrode conductors are disposed close to and in parallel to each other with a gap therebetween to form a rectangular plate shape as a whole, and the two electrode conductors are connected by a conductor at an end in the longitudinal direction. A high frequency current flows in the two electrode conductors in opposite directions. A plurality of openings are formed on edges of the two electrode conductors on the side of the gap, and the openings are dispersed and arranged in the longitudinal direction of the high frequency electrode. The antenna is disposed in a vacuum container in a direction that a main surface of the high frequency electrode and a surface of the substrate are substantially perpendicular to each other.
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