Low loss electromagnetic energy probe

Details Low loss electromagnetic energy probe Low loss electromagnetic energy probe

1992-04-13

1994-04-19

Hille, Rolf

Communications: radio wave antennas

Antennas

Wave guide type

333 26, H01Q 13080, H01Q 1400, H01P 5103

Patent

active

053050002

ABSTRACT:
A low noise block feedhorn system includes a waveguide antenna for receiving RF signals. The transition element is a waveguide to coaxial line probe assembly which includes a high conductivity probe and a low loss dielectric sleeve. The dielectric sleeve has a ring spacer at its top and probe spacer at the bottom to provide an air gap between the dielectric sleeve and the probe. The dielectric sleeve concentrates the RF field next to the probe and the air gap reduces the field intensity of the probe surface. Thus, a proper impedance match between the waveguide and the probe with less conducting losses is provided. A low noise block downconverter has its preamplifier connected by its input impedance matching network to the coaxial cable. By replacing the coaxial cable with a coaxial transformer as a second transition element the network can be eliminated and the preamplifier connected directly to the coaxial transformer for a further improvement in loss.

REFERENCES:
patent: 2825060 (1958-02-01), Ruze
patent: 3478282 (1969-11-01), Smith
patent: 4349790 (1982-09-01), Landry
patent: 4740764 (1988-04-01), Gerlack
patent: 4901369 (1990-02-01), Momose et al.
patent: 4970477 (1990-11-01), Gurcan et al.
Beaudette et al., Waveguide-to-Microstrip Transitions, Microwave Journal, Sep. 1989, pp. 211-216.

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