Antenna

Details Antenna Antenna

1987-10-14

1990-03-06

Hille, Rolf

Communications: radio wave antennas

Antennas

Spiral or helical type

343772, 343776, 343789, 343853, H01Q 136

Patent

active

049070126

ABSTRACT:
An antenna has a resonant cavity defined by electrically conducting plates and a sidewall, and has sixteen helical antenna elements each with five turns in the helical section and a probe at the opposite end, the stem of probe passing through an aperture in upper plate so that its end is within the resonant cavity common to all elements in that module.
The cavity has a cross-section parallel to the plates essentially square in shape except for the presence of four inwardly-protruding buttresses, one situated mid-way along each side of the cavity to promote the formation of standing waves of different mode, and thereby enhance the frequency range of the array.

REFERENCES:
patent: 2597144 (1952-05-01), Clapp
patent: 3509572 (1970-04-01), Barbano
patent: 4032921 (1977-06-01), Sikina, Jr. et al.
patent: 4400703 (1983-08-01), Shiokawa et al.
patent: 4680591 (1987-07-01), Axford et al.
patent: 4716415 (1987-12-01), Kelly

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