Generator of circularly polarized wave

Abstract

The present invention aims at providing a circular waveguide polarizer with high performance and low cost. The circular waveguide polarizer is realized by arranging a plurality of side grooves 12 in a side wall of a circular waveguide 11 along the direction of a pipe axis C1 and by appropriately designing the number, spacing, radial depth, circumferential width, length in the pipe axis direction, and the like. According to this circular waveguide polarizer, disturbance is imparted to a section with a coarse electromagnetic field distribution in a transmission mode to create a phase delay, so that the amount of phase delay does not vary largely with a delicate change in width, depth and length of the side grooves 12. That is, there is little deterioration in characteristics caused by a machining error or the like, and hence it becomes possible to effect mass production and cost reductions.

Description

[0001] This application is a divisional application of: [0002] Application number: 00803700.0 (PCT / JP00 / 08689) [0003] Filing date: December 8, 2000 (earliest priority date: December 10, 1999) [0004] Invention Name: Circularly Polarized Wave Generator technical field [0005] The present invention mainly relates to a circularly polarized wave generator used in VHF frequency band, UHF frequency band, microwave frequency band and millimeter wave frequency band. Background technique [0006] Fig. 1 is, for example, a schematic configuration diagram of a conventional circularly polarized wave generator shown in the Journal of the Society of Electronics and Communications (published in 1980, Vol.63-B, No.9, pp908-915). In the figure, 1 is a circular waveguide, 2 is a plurality of metal posts inserted from the side wall of the circular waveguide 1 in pairs relative to the tube axis C1 of the circular waveguide 1, and, relative to the circular waveguide 1 The direction of t...

AI Technical Summary

Problems solved by technology

[0010] Since the conventional circularly polarized wave generator is configured as above, it has a structure in which the metal pillar 2 protrudes into the circular waveguide 1, and as a result, an external disturbance is supplied to a portion in the circular waveguide 1 where the electric field distribution is dense. To delay the phase, a small change in the amount of insertion of the metal post 2 into the circular waveguide 1 will cause a large change in the amount of phase delay or reflection. Therefore, in order to obtain the desired passing phase characteristics or reflection It takes a lot of time to adjust the amplitude characteristics, making mass production difficult and price reduction difficult

[0011] In addition, since a plurality of metal objects, that is, metal pillars 2 protrude into the portion where the electric field distribution in the circular waveguide 1 is relatively dense, the performance of the circularly polarized wave generator with respect to power consumption and the performance of low loss deteriorates. The problem

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