Quadrifilar Helix Antenna

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The 21-40-60 is a small diameter airborne quadrifilar helix antenna, principally intended for data link applications where its design geometry provides excellent radiation coverage.

Designed as a quadrifilar helix, the antenna uses a lightweight fiberglass body with foamed-in-place feed network and printed circuit radiating element. The element is designed to provide wide angle coverage, including at low angles of elevation, over its frequency band and is designed to operate relatively independently of the ground plane on which it is mounted.

The antenna is secured to the airframe by four 4mm or similar screws.

Small profile
Lightweight
Designed to MIL-STD-810 environmental requirements
Fully environmentally sealed
Gain optimized over 2.4 - 2.5 GHz
Radiation pattern relatively independent of ground plane
Excellent low angle coverage

	21-40-60
Model #	21-40-60
Brand	Cooper Antennas

Frequency	2.0 GHz to 2.5 GHz
Gain (typical)	+3 dBiC. Maintains ≥0 dBiC from 10° to 90° elevation
VSWR	≤ 2:1
Impedance (nominal)	50 Ohms
Power	30 Watts max
Polarization	Right hand circular
Radiation	Omni directional in azimuth (beam max. at approx. 40° elevation)
Antenna RF Connector	TNC Female
Operational Temperature	-54°C to +70°C