Phase Stable IFF Antenna

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The 21-40-42 is a phase stable directional high gain IFF antenna intended for use as part of an IFF interrogator array for airborne applications.

Electrical design is configured as a monopole Yagi array and the position of the driven element, reflector and directors ensure high gain and a high front to back ratio.

Mechanical design comprises a printed circuit radiating element housed within a glass loaded composite shell fitted to an aluminum alloy base plate. All elements are foamed-in place for long term reliability.

	21-40-42
Model #	21-40-42
Brand	Cooper Antennas

Frequency	1030 ± 10 MHz 1090 ± 10 MHz
Gain	≥ 5 dB with respect to λ / 4 monopole
VSWR	≤ 1.5:1
Impedance (nominal)	50 Ohms
Power	1 KW peak
Polarization	Predominantly Vertical
Radiation	Azimuth - Directional Elevation - Co-sinusoidal (approx.)
Azimuth Beam width	± 50° to 5 dB points
Front-to-Back Ratio	≥ 15 dB
Phase Match	± 5° with respect to reference antenna at 1030 MHz and 1090 MHz
Antenna RF Connector	TNC Female

Construction	Fibre glass shell / Aluminium base
Height (max)	2 inches (50.8mm)
Length	9 inches (229 mm)
Weight	0.75 lb (0.34kg) max
Base Plate Shape	Oval
Fixing Holes	6 x Ø 0.2 inches (5.1mm) holes , counter bored 0.5 inches (12.7mm)