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RADIAFLEX ‘A’ enhances confined coverage In-building and in-tunnel wireless coverage is set to gain from the latest radiating cable series enhancement from Radio Frequency Systems. Offering enhanced performance and reduced longitudinal attenuation, RFS’s new RADIAFLEX ‘A’ is the successor to its popular RADIAFLEX range of foamdielectric radiating cable and connectors. With RFS low-density foam technology at its core, the new ‘A’ series offers crucial RF performance improvements for all smooth wall and corrugated RADIAFLEX cable series products. Significantly, at the same cost-per-length as its predecessor, the RADIAFLEX ‘A’ series features a reduction of typically six per cent in longitudinal attenuation across the entire frequency range. According to Peter Raabe, RFS Global Product Manager for Wireless Distributed Communication Systems, the introduction of higher frequency services in confined areas—including the universal mobile telecommunications system (UMTS) and wireless local area networks (WLAN)— has been the key driver behind the development of the new low-loss radiating cable technology. “The system designer is always fighting for every decibel (dB) loss,” he said. “Saving insertion loss on the radiating cable makes the system much more future-proof, and very well-suited for the high-frequency range, especially 3G applications.” The ‘A’ series will be available in smooth wall RADIAFLEX diameters (1/2, 7/8, 1-1/4 and 1-5/8 inch) and corrugated RADIAFLEX diameters (7/8, 1-1/4 and 1-5/8 inch). To accommodate the enhanced cable core, RFS is also providing new connectors for the 7/8, 1-1/4 and 1-5/8 inch diameter RADIAFLEX ‘A’ cables, with the last two being retrofittable to previous generation RADIAFLEX cable. No new tooling is required. And since the jacket diameters of RADIAFLEX ‘A’ cable remain unchanged, all existing installation accessories fit to the new series as well. 4 WHAT’S NEW Optimizer cellular/PCS wins over 90 degrees The ongoing demand in North America for 90-degree aperture cellular antennas, coupled with an increasing need for dualband solutions, has spawned an important new addition to the RFS Optimizer family—the new Optimizer cellular/PCS dualband antenna. Unveiled at CTIA 2004 in March this year, the new additions to Optimizer antenna family support both US cellular and personal communications systems (PCS) bands under one radome, with independent variable electrical tilt in each band. Importantly, the new antennas are available in beam width variants of either 65 degrees or 90 degrees, with effective polarization diversity retained across the entire aperture. “Until now, no-one has really been able to realize an effective 90-degree polarization diversity dualband antenna,” said David Kiesling, Director of Marketing, RFS Americas. “Other manufacturers have struggled to realize effective cross-polar discrimination over the entire 90 degrees. Our new models boast 20 dB cross-polar discrimination at bore site, and better than 7 dB across the entire aperture, guaranteeing effecting polarization diversity over the entire 90-degree beam.” Both the 65 and 90-degree beam width dualband Optimizer antennas boast an electrical tilt range of 0 to 10 degrees. As with all RFS Optimizer antennas, the new Optimizer dualband antennas provide superior upper side lobe suppression (better than 18 dB across the entire tilt range) and enhanced gain (nominal gain of 15 dB in each band). At first release both antennas will be available in two-metre long versions, with 1.3-metre versions to follow later in 2004.
RFS CompactLine suite complete at three-foot Radio Frequency Systems has recently completed two important additions to its range of cost-effective CompactLine microwave antennas: the new three-foot diameter CompactLine SB3 series, plus a new two-foot diameter CompactLine that meets the US Federal Communications Commission’s (FCC’s) category A performance requirements in the emerging 10-GHz band. The RFS CompactLine family is a comprehensive suite of solid reflector, low-profile, high-performance microwave antennas. Standard features of the CompactLine suite include a short shroud for low visual impact, and a modified Cassegrain feed system with shaped subreflector for optimum gain and pattern performance. The new SB3 antenna completes the RFS CompactLine suite in the two- to four-foot diameter area. Ideal for point-to-point applications, the CompactLine SB3 provides a practical alternative to oneand two-foot antennas, for high-capacity applications that demand a greater system gain. The three-foot CompactLine antenna offers the necessary system gains without concession, while dramatically reducing tower load when compared to the four-foot variants. First release CompactLine SB3 antennas were launched to the market during the second quarter of 2004, with the complete SB3 product portfolio ultimately providing three-foot diameter microwave antenna solutions for the 10- to 32-GHz frequency bands. Also launched during this period is the new two-foot diameter CompactLine SB2-105—a microwave antenna specifically developed to meet the FCC’s recently revamped Category A performance requirements in the emerging 10-GHz band. Earlier FCC Category A gain requirement in the 10-GHz band effectively had customers locked into a four-foot antenna solution, which was often oversized from a gain perspective. The new CompactLine SB2-105 solution helps open up this underutilized band, by providing a truly economic and low-profile solution for point-to-point and backbone applications. RFS superturnstile turns heads 5 Radio Frequency System’s new ultra-slim and lightweight superturnstile UHF broadcast antenna turned many a head at the NAB 2004 broadcast industry exhibition, held in Las Vegas earlier this year. Supporting the entire US and European UHF bands (470 to 862 MHz), the new RFS superturnstile antenna exhibits pattern circularity that competing, higher price point broadband antennas struggle to achieve. “The profile of our new superturnstile is less than that of competing UHF broadband antennas,” said RFS Broadcast Engineering Manager Dale Davenport. “This has resulted in a significant reduction in wind loading and weight when compared with competing products, providing broadcasters with enormous flexibility when considering installation on existing laden towers.” The result of rigorous computer modelling and ingenious materials selection, the RFS superturnstile exhibits pattern ripple of better than ±1.5 dB across the entire UHF band. Its low drag profile underpins the antenna’s high wind speed rating and low wind load characteristics. Uniquely cost-effective, the RFS superturnstile antenna family provides the ideal reduced-power digital television (DTV) broadcast solution for broadcasters who plan to take advantage of the Federal Communications Commission’s (FCC’s) waiver on the end-2004 full-power DTV deadline. The RFS superturnstile is also ideal for many other low and medium power broadcast applications, such as coverage of small to medium-sized cities, and translator applications. Mounting options include top mount and side mount. The new superturnstile is available in array sizes of up to 16 wavelengths for the top-mounted antenna, and up to 32 wavelengths for the side-mounted version. The family features a low drag fibreglass radome that provides excellent protection from the environment and acts as the main structural element of the antenna assembly. The antennas range in average input power rating from 4 kW through to 16 kW, and up to 32 kW for the sidemounted version. Gains from 7.2 dBd to 15.4 dBd are available.
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