Choice and design » History » Version 3
BLANCO GUTIERREZ, Andrea, 03/22/2015 06:25 PM
| 1 | 1 | BLANCO GUTIERREZ, Andrea | h1. Choice and design |
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| 2 | 2 | BLANCO GUTIERREZ, Andrea | |
| 3 | 2 | BLANCO GUTIERREZ, Andrea | Among all the antennas studied, double cross antenna has been selected to be built and used in receiving weather images, as previously mentioned, which are transmitted from POES NOAA satellite. |
| 4 | 2 | BLANCO GUTIERREZ, Andrea | |
| 5 | 1 | BLANCO GUTIERREZ, Andrea | The most important reasons for selection were the following characteristics: |
| 6 | 3 | BLANCO GUTIERREZ, Andrea | |
| 7 | 3 | BLANCO GUTIERREZ, Andrea | >• Right Hand Circular Polarization (RHCP) |
| 8 | 3 | BLANCO GUTIERREZ, Andrea | >• Omnidirectional radiation pattern without many side lobes |
| 9 | 3 | BLANCO GUTIERREZ, Andrea | >• Does not need a rotor |
| 10 | 3 | BLANCO GUTIERREZ, Andrea | >• High efficiency in terms of low angles w.r.t. the horizontal plane |
| 11 | 3 | BLANCO GUTIERREZ, Andrea | >• High gain |
| 12 | 3 | BLANCO GUTIERREZ, Andrea | >• High level of robustness because this antenna works well even when the measurements of its design or frequency vary a little bit |
| 13 | 3 | BLANCO GUTIERREZ, Andrea | >• Medium level in terms of complexity of construction and price. |
| 14 | 2 | BLANCO GUTIERREZ, Andrea | |
| 15 | 2 | BLANCO GUTIERREZ, Andrea | Moreover, the antenna will be fixed in the roof to facilitate the line of sight with the satellite. The received signal from the satellite is about twenty times higher in the zenith than in the skyline, therefore; it is necessary to have higher levels of gain in the lower angles corresponding to the position of the satellite around the skyline. |
| 16 | 2 | BLANCO GUTIERREZ, Andrea | |
| 17 | 2 | BLANCO GUTIERREZ, Andrea | To accomplish this, the antenna is built according with the following schematic: |