Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1992-07-22
1994-09-06
Hajec, Donald
Communications: radio wave antennas
Antennas
Spiral or helical type
343879, 343846, H01Q 136
Patent
active
053452488
ABSTRACT:
An antenna composed of an array of helical radiators has, in accordance with a methodology of the invention, a physical structure for reducing mutual coupling between closely spaced radiators so as to permit a reduction in spacing of the radiators. The radiators are mounted upon a mounting base, such as a ground plane element, with the helical radiators extending forward of the mounting base. Distances between the radiators and the mounting base are staggered in an amount approximately equal to one turn of a helix. The stagger distance corresponds approximately to one quarter of a free-space wavelength. The staggering significantly reduces the mutual coupling so as to permit closer spacing of the helical radiators such as, by way of example, in the formation of a feed directing radiant energy to a reflector of the antenna.
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AP-S Symposium, Session 4, 1610, Tuesday, Oct. 12, Room 161, pp. 117-120.
Advertisement from Microwave Journal.
Hwang Yeong M.
Jakstys Vito J.
Kilburg Francis J.
Lee Chun C.
Hajec Donald
Le Hoang-anh
Space Systems Loral, Inc.
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