20-21

RADALT Patch Antenna

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20 21

RADALT Patch Antenna - 20-21

Type 20-21 is a radar altimeter patch antenna (RADALT). The antenna is designed to exhibit the electrical characteristics of ARINC 707 and is a conformal design. The antenna operates with a broadside linear polarisation coverage in the Radar Altimeter (RADALT) band to allow transmission and reception of microwave signals from two adjacent antennas.

  • Conformal
  • Lightweight
  • Isolation ≤ 75dB at 20 inch spacing
  • Beam width ≤40 deg (H-plane), ≤45 deg (E-plane)
  • Side Lobe < -40dB

Specifications

  • Electrical Specs
  • Mechanical Specs
  • Standard Specs

Electrical Specs

Minimum Frequency
4200
Maximum Frequency
4400
Impedence
50
Return Loss VSWR
4200 - 4400 MHz: <2.0:1 (Max)
Gain
+10 dBiL
Polarization
Vertical
Radiation Pattern Azimuth
Omnidirectional
Radiation Pattern Elevation
Peak Power Watts
Average Power Watts
5

Mechanical Specs

Full Dimensions LxWxH mm
93 x 89 x 4.3
Height Above Base Plate mm
Mass kg
0.11
Connector Type
TNC Type Female

Standard Specs

Altitude ft
50000
Continuous Operating Temperature Min - C
55
Continuous Operating Temperature Max C
70
Vibration
RTCA DO-160C, Section 8, Curve C
Lightning
Standards
DO-160
14043 (2)

Get in touch

Chelton Limited, Marlow
The Chelton Centre
Fourth Avenue
Marlow
Buckinghamshire
SL7 1TF
United Kingdom
CAGE Code: U1907