| 摘要 |
PROBLEM TO BE SOLVED: To provide a primary radiator that can simply and surely fix a phase conversion member without deteriorating the performance. SOLUTION: A couple of mount holes 1a are formed to a waveguide 1 formed by winded with metallic plates, the mount holes 1a are bored within one plane passing through the center axis of the waveguide 1, and the interval of both the mount holes 1a is selected to be about 1/4 of the guide wavelength along the guide axis direction along the guide axis direction of the waveguide 1. A radiation section 5, an impedance conversion section 6, and a phase conversion section 7 are integrally formed to a dielectric feeder 2, after the dielectric feeder 2 is inserted to the inside of the waveguide 1, a couple of screws 8 are screwed to the mount holes 1a to lock the dielectric feeder 2 to a recessed part 7a at both side faces of the phase conversion section 7 and to fix the phase conversion section 7 in the inside of the waveguide 1 so as to be in crossing with a probe 4 at about 45-degrees. In the primary radiator configured as above, since the interval of both the screws 8 projected in the inside of the waveguide 1 is selected to be about 1/4 of the guide wavelength, the reflection in the one screw 8 and the reflection in the other screw 8 are deviated by about 1/2 wavelength and cancelled so as to prevent the deterioration in the performance caused by the reflection in the screws 8.
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