High frequency antenna with a variable directing radiation patte

Details High frequency antenna with a variable directing radiation patte High frequency antenna with a variable directing radiation patte

1991-08-21

1993-08-10

Mintel, William

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343817, 343837, H01Q 9160, H01Q 19280

Patent

active

052353435

ABSTRACT:
The present invention relates to an antenna apparatus emitting or receiving high frequency waves and comprising four parasitic vertical rod elements disposed symmetrically to a central vertical rod element and switching elements controlled by a control circuit so that the parasitic rod elements are applied successively and periodically to the ground potential by the control circuit.

REFERENCES:
patent: 3213645 (1965-11-01), Ehrenspeck
patent: 3521169 (1970-07-01), Turner et al.
patent: 3560978 (1971-02-01), Himmel et al.
patent: 4260994 (1981-04-01), Parker
patent: 4631546 (1986-12-01), Dumas et al.

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