27-Jan-2004 Print page

Branching out with four-foot RFS CompactLine

Wireless technology group Radio Frequency Systems (RFS) has extended its range of CompactLine microwave antennas to include a new four-foot diameter model, specifically designed for branching link applications. The new CompactLine SB4-W71A supports frequencies in the 7.1 to 8.5 GHz band, and provides the advantages common to all antennas in RFS’s popular CompactLine series: a compact form factor, low visual impact and light weight. Most importantly, the SB4-W71A offers unrivalled side lobe suppression--a vital attribute in today’s higher density networks.

The 7.1 to 8.5 GHz band is increasingly popular with network operators around the globe for realizing the network link between the backbone system and the main hubs--the so-called ‘branching link’ applications. “The 7.1 to 8.5 GHz band is an optimal choice for branching links, as it allows longer hops to be made without major atmospheric interference,” explained RFS Global Product Manager, Daniel Wojtkowiak.

Due to increasing network densities, such applications demand antennas with particularly low side lobe levels, to ensure minimal interference and more effective frequency re-use. “Network designers typically target side lobe interference levels of better than 35 dB below that of the main lobe,” Wojtkowiak said. The CompactLine SB4-W71, he said, achieves such levels within 20 degrees of the azimuth beam in the horizontal and 25 degrees in the vertical--around 5 to 15 degrees narrower than competing models.

The CompactLine SB4-W71 is the only solid-body microwave antenna in this diameter and frequency band that uses a mount manufactured from corrosion-resistant cast aluminum. This ensures the SB4-W71 weighs just 39 kg (around 25 to 30 per cent less than competing models) and is particularly easy to install. Designed for a survival wind speed of 200 km/hr, a simple bracing strut option is available that improves this to 250 km/hr.

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