Antenna Experts has 30 years of manufacturing & exporting eperience in producing military grade high performance VHF UHF quadrifilar helix antennas. We also known in international market for the supply of world highest power rating VHF UHF quadrifilar helix antenna. The quadifilar helix antenna are circular polarized omni antenna comprises two bifilar helical loops oriented in mutual orthogonal relationship on a common axis. The terminals of each loop are fed in anti-phase and the currents in the two loops are in phase quadrature of these quadrifilar helix antenna.

Antenna Experts QHA-350 high gain UHF quadrifilar helix antennas are rugged all weather model, enclosed in a ABS radome, uses high class copper alloy and does not require any field tuning or adjustments. The compact size of omni-directional quadrifilar helix antenna allows easy handling, shipping and highly suitable for receiving, transmitting, scanning, monitoring, surveillance and jamming applications.

QHA-350 RHCP LHCP UHF quadrifilar helix antenna are high suitable as base station antenna for Ground To Air communication application without having the requirement of multiple antennas. All junctions of quadrifilar helix antenna( QHA antennas ) are fully welded to prevent RF inter-modulation and antenna is completely protected within a high-tech ruggedized fiber glass or ABS radome to ensure survivability in the worst environments.

QHA-350 Series UHF quadifilar helix antenna available in both circular polarization sense LHCP or RHCP with multiple choice of mounting hardware be it for mast mounting for base station applicable or be it for civilian vehicular mounting application or be it for NATO 4 holes military vehicular mounting application or be it for man-pack application. Other type of mounting hardware / configuration can be supplied on request.

QHA-350 UHF Quadrifilar Helix Antenna are highly suitable for weather satellite communication, telemetry application, earth observation missions, space science missions without having the requirement of multiple antennas. RHCP omni or LHCP omni antenna termination fitted at bottom of mounting flange for complete weather protection. Complete 400MHz quarifilar helix antenna is supplied with radome to make it 100% weatherproof.

The RHCP QHA-350 high gain UHF quarifilar helix antenna or LHCP omni quadrifilar helix antenna are consisting of two pairs vertical loop radiating elements at right angles to each other, twisted into helix turns vertically and enclosed in ABS radome. The special "Teflon Dielectric Transmission Line" technique is used to handle high power handling capacity allowing smooth VSWR and good gain over the specified frequency band.

Quadrifilar helix antenna uses UV resistant ABS enclosure which has excellent transparency for RF signals and enough strength to withstand specified wind loads of QHA-350 UHF quadrifilar helix antenna. The stainless steel mounting hardware is supplied with the quadrifilar helix antenna. Cylindrical shell/enclosure is used for low wind loading and for minimal effect of ice formation on the quadrifilar helix antenna operation as well as providing an aesthetically pleasing appearance.

QHA-350 circular polarized UHF quadrifilar helix antenna consist of high quality copper radiating elements fed anti-phase and the currents in the two loops are in phase quadrature and enclosed in fiber glass tube. The QHA-350 quadrifilar helix antenna termination is enclosed at bottom of the antenna for complete weather protection. QHA series quadrifilar helix antenna is strong enough to withstand an ice storm, and will also do well in a shoreline environmental conditions. The marine grade type 316 stainless steel mounting hardware is supplied with the RHCP QHA Antenna or LHCP QHA antenna.

Antenna Experts QHA-350 UHF quadrifilar helix antenna are marine variant antenna and RF Transmission assembly is completely sealed and weather proofed to protect in harsh environments such as salt water, extreme humidity, wind, sand, snow and ice. QHA-350 quadrifilar helix antenna is low-profile antenna use Circular Polarization Antenna Technology - which delivers better penetration through obstruction and interference to minimize the effects of multipath interference. Thease commercial grade quadrifilar helix antenna provides superior performance as compare to significantly larger and more expensive products.

The UHF quadrifilar helix antenna is also highly suitable for Ground to Air communication/jamming application due to its wide elevation beamwidth with omni-directional properties. Quadrifilar helix antenna termination fitted just below the NATO mounting flange for complete weather protection. Other type of mounting hardware / configuration can be supplied on request.

Electrical Specification QHA-350 UHF Quadrifilar Helix Antenna 300-400MHz QHA Antenna

Mechanical Specification QHA-350 UHF Quadrifilar Helix Antenna 300-400MHz QHA Antenna

Environmental Specification QHA-350 UHF Quadrifilar Helix Antenna 300-400MHz QHA Antenna

To know more about quadrifilar helix antenna products datasheets and installation manuals in pdf format, please refer to "Quadrifilar Helix Antenna" section of our website. You can also request more technical information of quadrifilar helix antenna like VSWR curve and radiation patterns.