22-Jan-2007 Print page

New RFS Optimizer well matched for 3G

As 3G network deployments gather momentum across the globe, wireless technology leader Radio Frequency Systems (RFS) will launch a new platform of high-performance Optimizer base station antennas at the 3GSM World Congress exhibition in Barcelona. The Optimizer ‘S-series’ of broadband antennas has been specially designed to deliver excellent performance across the entire 1710-2170 MHz band. This includes the full spectrum of ‘high-band’ services--such as GSM 1800MHz, PCS 1900MHz, UMTS 2100MHz, and the new US ‘advanced wireless services’ (AWS) spectrum.

According to David Kiesling, RFS Global Product Manager Wireless Infrastructure Solutions, the new Optimizer range was inspired by the need for close matching of the AWS uplink and downlink, allocated the 1710-1755 MHz and 2110-2155 MHz bands respectively. Similarly, the UMTS transmit and receive bands are split, with the uplink at 1920-1980MHz and the downlink at 2110-2170MHz.

“Simple physics imposes slightly different RF behavior at the lower and upper end of the frequency band,” Kiesling said. “However, for optimum network performance it’s essential that the uplink and downlink are balanced. At the time the AWS spectrum was announced, there wasn’t a single antenna on the market that met the demands of commercial carriers.”

As a result, the Optimizer S-series takes ‘premium performance’ to the next level for all services in the 1710 to 2170 MHz band. It achieves an azimuth horizontal beam width difference of less than seven-degrees between uplink and downlink across the entire band; plus a gain difference of less than 1 dB. In addition, it features improved side lobe suppression (typically greater than 20 dB), variable electrical down tilt (0 to 10 degrees), and a stable vertical beam width across the band.

The RFS Optimizer S-series of base station antennas is initially available in two lengths (1.3 and 1.8 meters--or 4.4 and 6ft), plus two configurations: a single cross-polarized panel, or dual cross-polarized arrays side-by-side in a single radome (‘quad’ variant). “The quad antenna is effectively a double antenna in a single radome that’s only 15cm (six inches) wider than the single panel,” said Kiesling. “This provides carriers with ultimate flexibility at a given base station site, without incurring additional fees for installing another antenna.”

All variants of the Optimizer S-series feature pre-fitted antenna control units (ACU) for remote antenna tilt control functionality; in the case of the quad variants, each cross-polarized array is fitted with individual ACUs, permitting independent electrical tilt. “With remote antenna tilt functionality expected to be an important factor in 3G network optimization, pre-fitting the ACUs streamlines installation and reduces the possibility of error,” said Kiesling. The RFS ACUs are compatible with the antenna interface standards group (AISG) version 2 communications protocol.

To learn more of the RFS Optimizer S-series and full range of base station antennas, visit the RFS stand at 3GSM World Congress 2007: Hall 2, Stand C34, Venue Fira de Barcelona, Montjuic, Barcelona, Spain, 12 to 15 February 2007.

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