Helical antennas

Details Helical antennas Helical antennas

1977-06-13

1979-04-03

Lieberman, Eli

Communications: radio wave antennas

Antennas

Spiral or helical type

H01Q 136

Patent

active

041480309

ABSTRACT:
A plurality of coaxially wound, untuned helical antennas have a pitch that is a function of displacement along the axis of the antennas. The untuned antennas may be excited by signals that have a selected phase shift therebetween. The excitation causes an additive combining of electromagnetic waves radiated by the untuned antennas. The helical antennas may be tuned to radiate the waves in respective bands of frequencies, thereby simultaneously providing filtering and radiation characteristics that make the tuned antennas suitable for frequency diplexing.

REFERENCES:
patent: 2503010 (1950-04-01), Tiley
patent: 2633532 (1953-03-01), Sichak
patent: 3503075 (1970-03-01), Gerst
patent: 3573840 (1971-04-01), Draveil et al.
patent: 3906509 (1975-09-01), Duhamel

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