| 摘要 |
PROBLEM TO BE SOLVED: To reduce the peripheral deformation of a through hole that is caused at the waveguide machining time and to stabilize the characteristic of a leakage waveguide having a slot to leak the radio waves to a hollow conductor by adding a dielectric coat at the outer circumference of the hollow conductor to increase the radio waves which are leaked from the slot. SOLUTION: This leakage waveguide includes a hollow conductor 1 having an elliptical section shape, can lack a waveform and also can have the conductor 1 which is formed into a waveform. A sheath 2 which covers the outer circumference of the conductor 1 consists of a dielectric 2a, e.g. polyethylene and has an elliptical section shape having its increasing thickness at the center part of the long axis direction of the conductor 1. That is, the short/long axis ratio of an elliptical section of the sheath 2 is larger than that of the conductor 1 and the thickness of the sheath 2 increases at the center part of the long axis direction of the elliptical shape.
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