Patent ID: 7582569
Filing Date: 2009-09-01
Classification: H01J

Abstract:
1. A distributor comprising: an oscillator which outputs electromagnetic waves; a first square waveguide to be connected to said oscillator; a second square waveguide having a plurality of openings; and a plurality of radiation waveguides arrayed in a widthwise direction perpendicular to tube axes, wherein said first square waveguide and said second square waveguide communicate with each other through a communication hole formed in a first narrow wall of each of said first square waveguide and said second square waveguide, wherein said second square waveguide communicates with radiation waveguides through the plurality of openings, wherein said first square waveguide comprises a first guide wall which projects from a second narrow wall toward the communication hole and guides the electromagnetic waves propagating in said first square waveguide toward the communication hole, and wherein electromagnetic waves reflected by said first guide wall that travel in an opposite direction in said first square waveguide cancel the electromagnetic waves which are reflected by an end of said first square waveguide.