Microwave Antenna 24M

SUPER HIGH X PERFORMANCE

These 2.4 m antennas are designed for use in SDH radio relay systems where there are very high demands on XPD, sidelobe suppression and front-to-back ratio. These antennas may be used in areas with very high potential interference from nearby systems.

The high on and off-axis cross polarisation discrimination allows that all of the possible RF channels may be utilised for both horisontal and vertical polarisation making this antenna ideal for use at nodal points. The increased antenna gain may improve system margins or reduce the need for larger antennas.

Electrical Data

Frequency range	1.35 GHz – 13.00 GHz
High gain	60-65 %
High XPD	36-40 dB
Low side lobes
FCC compliant
ETSI compliant	ETS 300 833 Class 3
Polarization	Vertical/Horizontal/Dual

RPE data

angle (°)	H-pol (dB)	angle (°)	V-pol (dB)	angle (°)	X-pol (dB)

Material and Treatment

A parabolic aluminium reflector with shield for sidelobe suppression. The reflector is spray painted. Standard colour is grey RAL7038. The mount and rear structure are made of hot dip galvanised steel. All screws, nuts and washers are made hot dip galvanised steel class 8.8. The antenna is supplied with flexible radome. Depending on frequency band the feed is made of brass or hot dip brazed aluminium. Further information are given in data-sheet for actual frequency range.

Interface

115 mm column with minimum length 1520 mm

Alignment

Coarse:	Azimuth ± 50º (depends on column installation)
Fine:	Both planes ± 8º

Environment

Wind:	Survival without permanent deformation. Wind speed up to 70 m/s and 25 mm radial ice. Maximum deflection at 45 m/s are 0.1º.
Temperarure range:	-55ºC to +55ºC

Atmosphere

The antenna are designed to meet coastal and industrial atmosphere with 100% relative humidity.

Wind load

Wind effect on parabolic antennas and support structures can be separated into two force components and a twisting moment as shown in the figure.

The side axial and twisting moment forces shown in table 1 are maximum values exerted on the supporting structure. In every case the value is the result of the wind from the most critical direction. All forces are referenced to the antenna mounting column.

Wind speed	Axial force Maximum N (kp)	Side force Maximum N (kp)	Twisting moment Maximum Nm (kpm)
55 ^m/_s (200 ^km/_h)	14149 (1444)	6831 (697)	5303 (549)
70 ^m/_s (252 ^km/_h)	22919 (2339)	11065 (1129)	8709 (889)

Up to Arctic duty for very high wind 70/83 m/s.