Helical antenna feed element with switches to select end fire an

Details Helical antenna feed element with switches to select end fire an Helical antenna feed element with switches to select end fire an

1993-12-20

1995-08-22

Hajec, Donald

Communications: radio wave antennas

Antennas

Spiral or helical type

343729, 343837, 343840, 343876, 343911L, 343911R, H01Q 136

Patent

active

054444551

ABSTRACT:
An antenna system capable of receiving electromagnetic radiation having either right or left helical polarization, and either vertical or horizontal linear polarization includes an energy concentrator which concentrates energy at a focal point. A helical antenna is arranged in the proximity of the focal point. A first switch switches the helical antenna to a backfire mode of operation and a second switch switches the helical antenna to an end fire mode of operation. A control mechanism controls the switches to select the nature of the polarization.

REFERENCES:
patent: 3019438 (1962-01-01), Pan
patent: 3184747 (1965-05-01), Kach
patent: 3487413 (1969-12-01), Shores
patent: 3618090 (1971-11-01), Garrison
patent: 4014028 (1977-03-01), Cone et al.
patent: 4268831 (1981-05-01), Valentino et al.
patent: 4924238 (1990-05-01), Ploussios
patent: 5309167 (1994-05-01), Cluniat et al.
John D. Kraus, Author (The Helical Antenna-McGraw-Hill, Inc. .COPYRGT.1988) Section 7-4, pp. 276-289 and Section 7-15, pp. 326-329.

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