500 - 3000 MHz
The 21-40-20 is an ultra wideband, airborne monopole antenna, designed for use in SIGINT type applications where a number of them can be used to provide a DF array. The antenna structure comprises a contoured discone with careful element shaping to optimize radiation diagram and avoid deep nulls in the elevation pattern throughout the band.
Construction is from high strength fibre glass with aluminium alloy base plate and the whole structure is filled with closed cell foam for long term reliability in world wide condition of service.
- Ultra wide-bandwidth
- Low profile
- Can be used in arrays
- Fully sealed construction for environmental reliability
- Designed to MIL-STD-810 Environmental conditions
|Frequency||500 - 3000 MHz|
|Gain||Typically + 3 dBi (average)|
|Impedance (nominal)||50 Ohms|
|Power||100 Watts (average)|
|Phase/Amplitude match||The antenna can be selected for phase and amplitude matching for use in DF system, either to a “Golden Standard” or in sets.|
|Radiation||Omni-directional in azimuth, similar to λ/4 monopole in elevation.|
|Antenna RF Connector||TNC Female|
|Height||4.72 inches (120mm)|
|Element diameter||3.54 inches (90mm)|
|Base diameter||5.5 inches (139 mm)|
|Weight||1.4 lbs (0.63 kg) max|
|Fixing Holes||4 x Ø 0.208 inches (5.3mm), 100º countersunk|
- Urethane Lusterless Grey
- Other finish options are available.
- Please specify finish required when ordering.