Disposable radiator

Abstract

The invention provides a low manufacturing cost primary radiator, having superior assembling workability. A metal plate is wound in a cylindrical state, and both ends of the cylindrical plate are superposed at a connecting part 1a to form a waveguide 1. First flat parts 1c and second flat parts 1d, extending in the central axis direction, are formed alternately in twos at an interval of substantially 90 deg., with a total of four on the inner peripheral surface of the waveguide 1. A dielectric feeder 2 has a radiating part 5, an impedance converter 6 and a phase converter 7. The feeder 2 is inserted into the waveguide 1. Thus, both side faces 7a of the converter 7 are respectively press-injected in and are fixed to the first flat parts 1c, both mounting surfaces 6b of the outer peripheral surface of the converter 6 are respectively press injected in and fixed to the second flat parts 1d, and the converter 7 is crossed at an angle of substantially 45 deg. with respect to a probe 4 projected in a central axis direction of the waveguide 1.

Description

technical field [0001] The present invention relates to a primary radiator used for satellite broadcast reflective antennas, etc., especially to a primary radiator for radiating and receiving circularly polarized electromagnetic waves. Background technique [0002] Refer below Figure 14 with Figure 15 A conventional example of such a primary radiator is described, Figure 14 is a cross-sectional view of an existing primary radiator, Figure 15 is a front view of the primary radiator viewed from its horn. As shown in these figures, the prior art primary radiator is equipped with: a waveguide 210 having a horn portion 210a at one end and a circular waveguide 210 having its other end as a closed surface 210b; A pair of protuberances 211 on the inner wall surface of 210; and a probe 212 disposed between the protuberances 211 and the closed surface 210b. [0003] The waveguide 210 is made by die-casting metal materials such as zinc and aluminum, and the two protrusions 211 a...

AI Technical Summary

Problems solved by technology

Adhesives are generally used as a method of fixing such a phase shifter. However, in this method of fixing with an adhesive, it is necessary to attach the phase shifter to the inner wall surface of the waveguide while the phase shifter is positioned with a jig. There is a problem of poor assembly workability due to the complicated process of applying adhesive to the joint part of the phase shifter

In addition, as another fixing method, a method of fixing the phase shifter to the inside of the waveguide using screws has also been proposed. However, in this case, since the tip portion of the screw protrudes into the inside of the waveguide, there is a problem with the screw The problem that the front part of the front end reflects electromagnetic waves and deteriorates its performance

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