| 摘要 |
<p>PROBLEM TO BE SOLVED: To implement gain increase and sidelobe reduction in two separate frequency bands.SOLUTION: In a corrugation 2 formed on an outer wall 1a of a circular waveguide 1, grooves with two kinds of depth are formed and in a distal end portion 1d of the circular waveguide 1, grooves 1e with two kinds of depth are formed in a direction parallel with an axis 1c of the circular waveguide 1. A central portion 3a of a sub reflection mirror 3 is formed conically and around the central portion 3a, a longitudinal groove 3b is formed cylindrically in a direction parallel with the axis 1c of the circular waveguide 1. A portion from the longitudinal groove 3b to an outer peripheral portion 3c forms an inclined structure 3d, and the outer peripheral portion 3c is configured to protrude closer to the circular waveguide 1.</p> |
