| 摘要 |
PURPOSE:To attain matching of a parabolic antenna including the window glass, etc. existing at the front part by providing a chevron-shaped or wave-shaped dielectric plate at the front of said antenna which is used at a milliwave band and varying the sloping angle of the dielectric plate to the radiating direction of the radio wave of the dielectric plate. CONSTITUTION:An angle changing mechanism 2 for dielectric plate provided with a slider 3, a feed screw 4, a handle 5, etc. is set at each of both ends of a frame 6 for an antenna matching device for a parabolic antenna 7 which is used at a milliwave band. Furthermore a chevron-shaped dielectric plate 1 which is attached rotatably to the slider 3 through its both ends is added to the antenna maching device. The plate 1 is used at the front of the antenna 7. Then the slider 3 is moved with operation of the handle 5 and the sloping angle theta of the plate 1 is varied. Thus the effective thickness of the plate 1 is changed to the radio wave radiating direction as shown by an error head P. This attains matching of the antenna 7 including the window glass, etc. existing at the front of the antenna. |
