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Antennas
Weather Radar Antennas
We offer 8.5m, 6.2m and 4.5m antenna systems for weather radar requirements. Below are the typical parameters for 8.5m Doppler Radar Antenna system.
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1. General Description
The antenna is a horn-fed paraboloid and operates in S-band. The antenna is mounted on a pedestal inside the radome and it can operate continuously for 24 hours.
2. Antenna Electrical Specifications
The antenna provides a single pencil beam in accordance with the following electromagnetic requirements.
| Operating Frequency Range | 2.7～3.0GHz |
| Polarization | linear horizontal |
| Beamwidth, max | 0.99 deg |
| Power Gain, min | 45dBi (midband), 44.5dBi (over the operating frequency) |
| Sidelobe Levels | ≤-27dB @ 0 deg to ±2deg in every plane |
| straight line connecting –26dB @ ±2deg and –38dB @ ±10deg in every plane | |
| ≤-42 dB @ ±10deg or above in every plane (averaging of sidelobes above 10deg as specified for NEXRAD) | |
| Cross-Polarization | ≤27dB |
| Median Gain | ≤ -13dBi |
| Power-Handing Capability | Combined peak power level: 0.9MW,
Average power level: 1.8KW
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| VSWR | ≤1.45:1 |
| Air Pressurization of waveguide | 7 PISG |
3. Antenna Physical Characteristics
| Reflector weight | 1200kg |
| Reflector diameter | 8534mm |
| F/D | 0.375 |
| Reflector accuracy | ≤0.76mm(R.M.S) |
| Rotation velocity | max. 36 deg/s |
| Rotation acceleration | max.19 deg/s2 |
| Position accuracy | ≤ ±0.2 deg |
| Rotation range | EL -2 deg ～+92 deg, AZ 360 deg continue |