초록

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Abstract ▼ AI-Helper

This paper describes mobile DBS/CS receiving antenna system which receives satellite broadcasting and satellite internet on the way of moving. With the antenna system, various kinds of multimedia service can be provided from satellite. A couple of horizontally polarized 8x8 Yagi-like patch array ant...

This paper describes mobile DBS/CS receiving antenna system which receives satellite broadcasting and satellite internet on the way of moving. With the antenna system, various kinds of multimedia service can be provided from satellite. A couple of horizontally polarized 8x8 Yagi-like patch array antenna with $30^{\circ}$ squinted beam has been used in consideration of the height of the whole antenna system. The gain of each antenna is 23.5dBi and it has HPBW of $11^{\circ}$ elevational angle and $8^{\circ}$ azimuthal angle. The receiving signal at antenna is divided between input signal and tracking signal at beam forming block. The each divided signal is transmitted to correspondent down converter set-top box or control unit. The developed antenna system has the tracking range of $45^{\circ}$$\pm$$5.5^{\circ}$ in the direction of elevation angle and $360^{\circ}$ in the direction of azimuth angle. The mechanical tracking method so called electrically sequential lobe comparison method has been adopted to trace azimuth angle. The tracking speed is $60^{\circ}$/sec and the loss during tracking is 0.5d8. Field test has been performed to measure the quality of the developed antenna system. The test result showed C/N of 13.5dB when receiving BS and 12.5dB when receiving CS.

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