| | 1 | == Antennas == |
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| | 3 | There are two styles of antennas in use in COSMOS. The first style is directional and used exclusively as part of the large node sectors. The second style is omni-directional and used as part of the medium nodes. |
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| | 5 | || [[Image()]] || [[Image()]] || |
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| | 7 | [[BR]] |
| | 8 | === Directional (large node sector) === |
| | 9 | The directional antennas are comprised of a horizontal array of four ultra-wideband antenna elements. Each element is oriented in the vertical plane and spaced 3 inches (7.63mm) from its neighbor. The frequency range covered by the antennas is 900 MHz - 12 GHz. However, due to limitations in the power amplifiers, USRPs, and other RF front end components, the actual frequency ranges are 2.4 - 6 GHz for transmit (non-contiguous, see RF front end for details) and 900 MHz - 6 GHz for receive. |
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| | 11 | [[BR]] |
| | 12 | === Omni-directional (medium node) === |
| | 13 | The omni-directional antennas are comprised of four vertically oriented multi-band antennas in a 6” (15.24 cm) 2x2 square pattern with a 14.25”x14.25” (36.2x36.2 cm) ground plane. The frequency range covered by the antennas is 1.7 - 6 GHz. However, due to limitations in the power amplifiers, USRPs, and other RF front end components, the actual frequency ranges are 2.4 - 6 GHz for transmit (non-contiguous, see RF front end for details) and 1.7 - 6GHz for receive. |
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| | 15 | [[Image()]] |
