OMNI Antennas, VERTICAL polarisation
An omni antenna radiates full power 360° in the horizontal plane. Peak gain usually on the horizon.
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 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.
- VOA and OA series
- 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 but rugged, for harsh environments
- For special applications horizontally polarised high gain omnis can be developed
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
- Left or right circular polarisation
- Good axial ratios
- Bandwidths up to 15%
HEMI OMNI Antennas
Hemi omni antennas provide coverage over a hemisphere for applications that require a single antenna to cover a very wide area such as:
- Links to satellites and airborne platforms
- Air to ground links when inverted
These antennas feature:
- Circular or dual circular polarisation
- 2 to 3dBiC peak gain overhead
- 120° to 150° beamwidth
- Active or passive
DIPOLE Omni Antennas
Traditional dipoles have omni-directional coverage, are rugged or flexible, with approximately 2dBi gain. Monopole and dipole antnnas have a 360° azimuth coverage and typically 80° elevation coverage.
They are balanced and independent of ground plane.
- EVD2 series - rugged dipoles with rigid glass fibre radome, most have N-type connectors
- SVD2 series - semi rigid with abrasion resistant rubberised coating, most have SMA connectors
- Vertical polarisation
- Gain 2dBi with elevation HPBW 80°
- Frequencies 300MHz to 12GHz
BLADE omni Antennas
- Blade antennas can be as little as 2mm thick
- They may be housed in protective radomes
- Aerodynamic
- Light weight
- Specification as for dipole antenna
- Coverage can be omni-directional or directional, depending on the application requirements
Blade (printed circuit) antennas are suitable where a 2mm thick fully efficient antenna is needed.
