Technical Notes - Omni and Dipoles

Flat Panel > Sector > Omni > Broadband > Helix

EVD2 - Rugged dipole
SVD2 - Slim flexible dipole
SBA - Short blade antennas
VOA - Omni, vertically polarised
RCO - Omni, circular polarised
HOA - Hemi omni

DIPOLE and BLADE Antennas
Dipole radiation patternDipole antenna SVD2-3450/426
Dipoles are balanced and independent of ground plane
Bandwidths up to 8%, although designs up to 20% are possible with a maximum VSWR 2:1
Finished in abrasion resistant, rubberised coating.

Frequency range 300MHz to 12GHz, gain typically 2dBi with elevation HPBW 80°
Primary application - 360° omni directional coverage in the horizontal plane
Suitable for rugged environments, slimline dipoles are flexible, rugged dipoles have rigid glass fibre radomes.
Blade antennas suitable where a 2mm thick fully efficient antenna is needed and can be housed in protective radomes.

* Typical radiation pattern for 2dBi dipole antenna


OMNI Antennas, VERTICAL and HORIZONTAL polarisation

Vertically polarised omnis Centre fed to ensure peak gain remains on the horizon at all frequencies to provide stable, ground-plane independent radiation patterns
Frequencies up to 18GHz, gain measurements up to 11dBi
Lightweight, with full environmental protection using rugged, glass fibre radomes and aluminium spigots
Multiple omni antennas in single structure for high isolation
XVO models have corporate feed structure to provide wider bandwidth and other critical features such as null-fill, electrical downtilt and side lobe suppression
XHO models have horizontal polarisation

* Relative size of omni antennas, different gain, same frequency.

 

 



OMNI Antennas CIRCULAR polarisation

Typical radiation pattern Omni directional antennas have peak gain in the azimuth plane, whereas hemi omnis have peak gain overhead.
RCO models have circular polarisation
HOA hemi omni antennas
Designs for helicopter and UAV applications
Frequencies up to 18GHz.
Left or right hand circular polarisation, gain from 2dBiC to 18dBiC
Bandwidths up to 15%
*Typical elevation patterns of circular polarised antennas. .
*Relative size of RCO or HOA antennas different gain, same frequency
RCO antennas

ANTENNA TYPES
FLAT PANEL ANTENNAS Slim, directional antennas with high gain. Flat Panel
SECTOR ANTENNAS Directional antennas with sector coverage, 400MHz to 14GHz. Sector
OMNI-DIRECTIONAL ANTENNAS Omni and end-fed dipole antennas, rugged, various polarisations Omni
BROADBAND ANTENNAS Ultra-wide band coverage, Planar Spiral and Omni Broadband
HELIX ANTENNAS Directional, medium gain, broad bandwidth. Helix