Model AS-500-4000 500 - 4000 MHz. 3~6 dBic Gain 
 

SPIRAL ANTENNA

Design Features Features The cavity backed dual arm archimedean spiral antenna use 6063T6 ultra corrosion resistant architectural anodized aluminum alloy and designed to provide wideband directional transmission/reception of radio signals from 500-4000 MHz bands. The antenna is supplied with powder coating finish to protect the antenna further from severe environmental conditions. Both left hand circular polarization (LHCP) and right hand circular polarization (RHCP) are available. The cavity backed dual arm archimedean spiral antenna is a frequency independent antenna and this spiral antenna is weather protected suitable for outdoors use in applications requiring circularly polarized RF radiations. The AS-500-4000 uses extended coaxial stubs technique to provide constant 3+ dBi gain over entire 500-4000 MHz frequency band while maintaining the wider beam-width. This cavity backed spiral antenna is highly suitable for transmission, reception, monitoring, scanning, ECM, surveillance, signal intelligence (SIGINT), direction finding (DF), telemetry and airborne applications due to its ultra broad band design feature.

Constructions The spiral antenna is sealed in an aluminum cavity and is highly immune to noise. Matching circuit of spiral antenna is housed inside the main body of the antenna. A special mounting hardware to mount the spiral antenna on vertical pole having outer diameter of 19-25.4mm (3/4"-1"). Higher diameter mounting including any customized mounting can be supplied on request. Spiral antenna N-Female termination is fixed on top of the antenna body for easy connectivity. Other termination can be supplied on request. The AS-800-4000 spiral antenna is light weight, broadband and rugged spiral antennas, supplied with Nylon plastic cover to protect the antenna from environment. The spiral antenna is designed to perform with much higher efficiency than conventional rubber duck antenna.


Electrical Specifications:
Frequency Range 500 - 4000 MHz.
Gain3~6 dBic
Bandwidth500-4000MHz
PolarizationCircular - LHCP or RHCP
Input Impedance50 Ohms
Horizontal Beamwidth -Half Power Points60-80 Degrees
Front to Back Ratio18 dB.
VSWR2.5:1
RF Power Handling Capacity150 Watts.
Input TerminationN-Female

Mechanical Specifications:
MaterialsAluminum & Copper
Mounting Hardware -MaterialsMarine Grade Stainless Steel
Wind Rating200 Km/Hr.
Overall Length290mm x 90mm
Shipping Length330 x 180mm (13 x 7 Inches)
Housing MaterialAluminum Enclosure
Insulator MaterialTeflon and Nylon
Maximum Mount Pipe Diameter 19-25.4mm (3/4"-1")
Radiating Elements
- Material
- Cross Section

Copper
Strips
Gross Weight3 Kgs

Environmental Specifications:
Operating Temperature(-)30 to +60 Degrees Celsius
Storage Temperature(-)40 to +70 Degrees Celsius
Humidity0 to 95% RH