Model AH-450 430-475 MHz 11 dBic Gain 
 

HELICAL ANTENNA

Design Features: The AH-450 uses extended stubs to provide the greater gain while maintaining the wider beam-width. This high-gain low-profile antennas use Circular Polarization Antenna Technology - which delivers better penetration through obstruction and interference. The AH-450 helical antenna is highly suitable to provide the uninterrupted communications in the tunnels. This commercial grade antenna provides superior performance as compare to significantly larger and more expensive products. Our AH series helical antennas are smaller than conventional yagi antenna. The AH-450 Helical Antenna is supplied with a specially designed mounting arrangement to hold the antenna at back end by using two stainless steel mounting brackets to withstand the higher wind rating. Optional: A mounting arrangement to support the antenna from front end can also fixed to handle the high wind pressure created by high speed trains. Both LHCP and RHCP models are available.
The part number for LHCP version is AH-450-LHCP and AH-450-RHCP is for RHCP version.
Constructions: The AH-450, like all our AH series helical antennas, utilizes right hand circular polarization to minimize the effects of multipath interference. The AH-450 Helical Antenna is heavy duty, broadband and rugged helical antennas, supplied with fiberglass radome to protect the antenna from environment. Cylindrical enclosure is used for low wind loading and for minimal effect of ice formation on the helical antenna operation as well as providing an aesthetically pleasing appearance. Optional: Two drain holes can be provided at the bottom surface of helical antenna enclosure.

Electrical Specifications:
Frequency Range430-475 MHz
Gain11 dBic
Bandwidth430-475MHz
Antenna TypeDirectional Helix
PolarizationCircular - RHCP or LHCP
Input Impedance50 Ohms
Radiation PatternDirectional
Horizontal Beamwidth -Half Power Points50+/-5 Degrees Typical
Front to Back Ratio14+/-2 Degrees Typical
VSWR2:1
RF Power Handling Capacity500 Watts
Input TerminationN-Female

Mechanical Specifications:
MaterialsFiber Glass, Copper, Aluminum
Mounting Hardware -MaterialsMarine Grade Stainless Steel
Wind Rating200 Km/Hr.
Overall Length1450 mm
Shipping Length1500 mm
Radiating MaterialHigh Quality Copper
Mounting Clamps PositionAt Rear End of Antenna
Maximum Mount Pipe Diameter 45-60 mm
Radome MaterialHigh Strength Fiberglass
Radome Length1300 mm
Gross Weight14 Kgs.

Environmental Specifications:
Operating Temperature(-) 30 to +70 Degrees Celsius
Storage Temperature(-) 40 to +80 Degrees Celsius
Humidity0 to 95% RH