Title:
MULTI-BAND CONCENTRIC HELICAL ANTENNA
Document Type and Number:
WIPO Patent Application WO1997042682
Kind Code:
A3
Abstract:
A Multi-Band Concentric Helical Antenna (20) operating in a novel conical mode, useful for general and satellite communications is disclosed. A higher frequency helix (24) is placed concentrically inside a lower frequency one (22). In one embodiment, each helix has four helical elements (22a-d, 24a-d). The outer helix is fed at a first frequency (f1) and the inner helix (24) is fed at a second frequency (f2). The second frequency (f2) may be greater than twice the first frequency (f1). Both helices (22, 24) have the same polarization. The pitch (P1, P2), diameter (D1, D2), and length (AL1, AL2) of the helices are chosen so that said antenna (20) radiates with approximately equal flux at all points in a far-field plane. Alternatively, two inner helices (24, 25) are placed concentrically within an outer helix (22). In a space application, the helices (22, 24) may be air wound springs (22a-d, 24a-d), compressed flat prior to a launch and deployed to fall length in flight. Another embodiment (50) features helically-wound tape (54, 56) wound on inflatable, non-conducting supports (52, 58) concentrically positioned and deployed in space to form the concentric helices (54, 56).
Inventors:
GRYBOS DAVID P
HUNG CHARLES C
HUNG CHARLES C
Application Number:
PCT/US1997/006810
Publication Date:
December 11, 1997
Filing Date:
May 01, 1997
Export Citation:
Assignee:
LEO ONE IP L L C (US)
International Classes:
H01Q1/28; H01Q11/08; H04B7/185; (IPC1-7): H01Q11/08
Foreign References:
| FR1204354A | 1960-01-26 | |||
| US4148030A | 1979-04-03 | |||
| FR2091927A1 | 1971-01-21 | |||
| US3599220A | 1971-08-10 | |||
| US5255005A | 1993-10-19 | |||
| EP0666612A2 | 1995-08-09 | |||
| US2611868A | 1952-09-23 |
Other References:
CARDOSO J C ET AL: "A SPHERICAL HELICAL ANTENNA", PROCEEDINGS OF THE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSIS), ANN ARBOR, JUNE 28 - JULY 2, 1993, vol. 3, - 28 June 1993 (1993-06-28), INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 1558 - 1561, XP000452569
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