Antenna system for satellite digital audio radio service (DARS)

Details Antenna system for satellite digital audio radio service (DARS) Antenna system for satellite digital audio radio service (DARS)

1997-06-13

1999-12-14

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

343895, 343770, H04B 7185

Patent

active

060023597

ABSTRACT:
A digital audio radio service (DARS) antenna system is provided. The DARS antenna system includes a broadcast antenna mounted on a spacecraft. The broadcast antenna includes a slotted waveguide direct radiating array (SWDRA). The DARS antenna system also includes a mobile user receive antenna having a quadrifilar helix antenna (QHA). The DARS antenna system further includes a parallel plate polarizer arranged on the broadcast antenna for generating circular polarization. In an embodiment, the polarizer has a plurality of thin plates arranged perpendicular to the SWDRA surface. Broadcast antenna is optimized for overall system performance and is capable of high RF power and beam shaping. The DARS antenna system is also highly reliable and easily deployed from a spacecraft. An embodiment of the DARS antenna system of the present invention further includes "universal" model and "regional" model mobile antennas to easily accommodate personal travel and commuter needs.

REFERENCES:
patent: 5198831 (1993-03-01), Burrell et al.
patent: 5327150 (1994-07-01), Cherrette
patent: 5604972 (1997-02-01), McCarrick
patent: 5635945 (1997-06-01), McConnell et al.
M. C. D. Maddocks, et al., "Polarisation Converters For A DBS Flat-Pate Antenna," BBC Research Department Report, Jul. 988, pp. 1-8.
Richard C. Johnson, "Antenna Engineering Handbook", Chap. 9 Slot-antenna Arrays, McGraw-Hill 1993.
Richard C. Johnson, "Antenna Engineering Handbook", Section 23-5: Transmission-and Reflection-type Polarizers, pp. 23-25, McGraw-Hill 1993.

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