Cobham Antenna Systems, Microwave Antennas
TECHNICAL INFORMATION
Phone +44(0)1638 732177 or
Email Microwave Antennas
ANTENNA TYPES
Omni Antennas - OA and VOA Vertically Polarised
Omni Antennas - RCO/LCO Right or Left Polarised
Omni Antennas - EVD2/SVD2 Dipole
Hemi Omni Antennas - HOA
Omni Antennas - OA and VOA Vertically Polarised
• Gain up to 11dBi
• Frequencies up to 18GHz
• Centre fed to ensure peak gain remains on the horizon
• Stable, ground-plane independent radiation patterns
• Light weight and rugged for harsh environments
• Horizontally polarised high gain omnis can be developed
• Multi-stacked omnis available
An omni antenna is defined as one that radiates full power 360° in the horizontal plane. All collinear omni antennas are centre-fed making them ground-plane independent and providing stable radiation patterns across the band.
High gain omnis can be produced by stacking and feeding more elements. This has the effect of reducing the elevation beamwidth. By adjusting phase and amplitude to each element, sidelobes can be controlled and the elevation beam can be shaped to provide other features such as null-fill or electrical tilt.
Collinear antennas combine light weight construction and environmental protection with rigid glass fibre radomes and aluminium mounting spigots.
Omni Antennas - RCO/LCO Right or Left Polarised
Many applications benefit from circular polarisation to optimise performance, in particular ground to airborne applications. Circular polarised omni antennas are available with:
• Frequencies 400MHz to 14GHz
• Good axial ratios
• Bandwidths up to 15%
Omni Antennas - EVD2/SVD2 Dipole
• Vertical polarisation
• Gain 2dBi with 360° azimuth and HPBW 80° elevation coverage
• Frequencies 300MHz to 12GHz
• SVD2 are slim and semi rigid with abrasion resistant rubberised coating, most have SMA connectors
• EVD2 are rugged with glass fibre radomes, most have N(F) connectors
Hemi Omni Antennas - HOA
• Circular or dual circular polarisation
• 2 to 3dBiC peak gain overhead
• 120° to 150° beamwidth
• Active or passive
Hemi omni antennas provide coverage over a hemisphere and is suited for applications that require a single antenna to cover a very wide area such as links to satellites and airborne platforms, as well as air to ground links when inverted.