Tuesday, August 19, 2008

Creating Low Cost Antennas for Direct Broadcast Satellite Radio

Creating Low Cost Antennas for Direct Broadcast Satellite Radio

The Direct Broadcast Satellite Radio (DBSR) hologram is a joint effort between NASA and the United Stales Information Agency/Voice of America (USIA/VOA). DBSR will offer audio signals via satellite with various levels of sound quality (AM, FM, and CD) to reach a variety of radio receiver types (fixed, portable, and, mobile) in various environments (indoor/outdoor, rural, urban, and suburban). To reduce the feed circuit loss and to provide a precise amplitude and phase input at the four feed ports, a printed circuit board (PC13) striplinc feed, as pictured in figure 4, was designed rind fabricated. This circular patch antenna has four specific feed points connected to the four output ports of the printed circuit board (PCB), which was designed to provide the correct amplitudes and phase quadratures (for right hand circular polarization or RIICP) at the four feed points. Note that the antenna size may be further reduced to approximately 6“ by 6“ in size by replacing the feed lines with a PCB feed circuit board behind the radiating patch elements. TABLE 1. Summary of Measured Omni Antenna Performances at 2.0S GIIZ.

DOWNLOAD LINK: http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/32627/1/94-0375.pdf

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