Broad beam monofilar helical antenna for circularly polarized ra

Details Broad beam monofilar helical antenna for circularly polarized ra Broad beam monofilar helical antenna for circularly polarized ra

1999-07-12

2000-12-26

Ho, Tan

Communications: radio wave antennas

Antennas

Spiral or helical type

H01Q 136

Patent

active

061667099

ABSTRACT:
A broad beam helical antenna contains a monofilar winding of a constant helical diameter and large valued pitch angle. The diameter of the helical antenna is defined such that its circumference is slightly less than one wavelength of the circular polarized radio waves. The pitch angle lies in a relatively high range on the order of 18.degree. to 24.degree.. These parameters provide a generally uniform gain over a relatively wide beam angle on the order of 60.degree. off boresight. Such gain-uniformity facilitates maintaining a link between a satellite and mobile platform-mounted communication equipment.

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patent: 5754146 (1998-05-01), Knowles et al.
patent: 5892480 (1999-04-01), Killen

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