Process of fabricating a waveguide

Details Process of fabricating a waveguide Process of fabricating a waveguide

1987-03-10

1989-12-12

Goldberg, Howard N.

Metal working

Method of mechanical manufacture

Electrical device making

333239, H01P 1100

Patent

active

048858390

ABSTRACT:
A broadcasting arrangement includes a source of signals to be transmitted which is subject to distortion in the event that signals are reflected. An antenna is adapted for radiating all the signal applied to a polarization sensitive input part with a particular polarization. The antenna is mounted on a tower. A waveguide is coupled to the source of signals and to the input port of the antenna. If the waveguide is circular waveguide, the windload on the tower due to wind loading of the circular waveguide is low, but flexure which occurs results in polarization changes which causes signals applied to the antenna input port to be reflected, thereby reducing radiated power and causing distortion. If the waveguide is rectangular, the wind loading is high and the tower must be more sturdy and therefore more costly than for circualr waveguide. A truncated circular waveguide is used which has a wave propagation channel defined by a cylinder and a pair of parallel longitudinal plates in the cylinder. Truncated circular waveguide has low wind load and polarization stability.

REFERENCES:
patent: 2783440 (1957-02-01), Lovick, Jr.
patent: 3205462 (1965-09-01), Meinke
patent: 4549310 (1985-10-01), Woodward
patent: 4556853 (1985-12-01), Clark
Article "Cutoff Wavelengths of Waveguides with Unusual Cross Sections", by Pyle et al., published at pp. 556-557 of IEEE Transactions on Microwave Theory and Techniques, Sep. 1964.

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