Mode-controlling waveguide-to-coax transition for TV broadcast s

Details Mode-controlling waveguide-to-coax transition for TV broadcast s Mode-controlling waveguide-to-coax transition for TV broadcast s

1984-09-28

1985-12-03

Gensler, Paul

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

333 33, H01P 5103

Patent

active

045568537

ABSTRACT:
A coax-fed slotted-cylinder (pylon) antenna for UHF television operation at power of 200 kW and above has a coaxial feed which is large enough to propagate higher TE.sub.11 mode as well as the desired fundamental TEM mode. The power fed to each slot and as a consequence the antenna array factor may be perturbed by the higher modes. It is important to reduce losses in the feed of the high-power signals from the transmitter or high power amplifier up the tower to the antenna. For lowest loss, a waveguide is used for the run up the tower. A waveguide-to-coax transition is used for adapting the waveguide to the coaxial antenna feed while suppressing the undesired TE.sub.1,1 mode. The transition has two short semicircular waveguides opening into the waveguide feed from the transmitter. The semicircular walls of the two waveguides are coupled to the outer conductor of the coax antenna feed. The semicircular waveguides have a common flat wall, the center of one core of which is coupled to the center-conductor of the coax antenna feed.

REFERENCES:
patent: 2619539 (1952-11-01), Fano
patent: 2878453 (1959-03-01), Elliott
patent: 3182272 (1965-05-01), Borghetti
patent: 3205498 (1965-09-01), Child
patent: 4129871 (1978-12-01), Johns
Microwave Antenna Theory and Design, edited by S. Silver, published by Dover Publications, 1965, p. 8.

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