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vor 9 Jahren

2-2013

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HF-Praxis 2/2013

RF & Wireless Wireless

RF & Wireless Wireless Wireless Telecom Group Introduces Microlab Jumper-Cables Microlab, a Wireless Telecom Group company, has extended its line of JP / JR / JS series jumper cables. With an operating range of DC to 3 GHz, these cables are ideal for all telecommunication applications in the frequency bands between 380 and 2,700 MHz. While attractively priced, all cables are „Microlab Certified“, a quality guaranty well recognized in the Telecommunication market. „Whether macro cells or in Building DAS venues, the wrong RF cable can have a devastating influence on network reliability and Quality of Service. Passive intermodulation (PIM) is often thought „negligible“ at in-building DAS venues. Unfortunately this is not the case“, says Wolfgang Damm, Product Marketing Director of WTG. „The front end of a DAS Carrier Combiner interface is principally susceptible to PIM interference. High power levels are attenuated and combined at this stage. If PIM levels are not minimized right there, systems‘ overall performance is reduced significantly. Our new J-cables are especially designed with these requirements in mind. They are 100% tested to guarantee best system performance“. Microlab‘s Jumper cables are available with N and DIN 7/16 connectors, both as straight and rectangular types. Available connector combinations are: JP straight (m) / straight (m), JR straight (m) / rectangular (m), JS rectangular (m) / rectangular (m). The ruggedized cables have tri-metal plated connectors made to MIL-C-39012 specifications. These cables have been developed to provide both, low loss and low PIM characteristics. PIM performance is typically better than -150 dBc (@ 2x43 dBm), with -145 dBc guaranteed @ 1800 MHz. Microlab‘s Jumper Cables are available for immediate delivery from the factory and selected distributors. Cable length of 0.5 m (20“) and 1 m (39“) are available from stock, other cables lengths are available on request in 10 cm (4“) increments. ■ Wireless Telecom Group www.wtcom.com Products 3 V LTE Linear PA Modules The parts in RFMD's new RF73xx series of high-power, high-efficiency linear power amplifiers are designed for use as the final amplification stage in 3V, 50 Ohm LTE mobile cellular equipment developed for E-UTRAN\LTE band operation. These parts are developed for 5 MHz to 20 MHz LTE channel bandwidths. Each has two digital control pins to select one of three power bias states to optimize performance and current drain at lower power levels. Each also has an integrated directional coupler which eliminates the need for an external discrete coupler at the output, and is assembled in a 10-pin, 3 mm x 3 mm x 0.8 mm module. Features Frequency bands: RF7303 (Multi-Mode): LTE/UMTS 3, 4, 9, and 10; CDMA 15, RF7317A: LTE 17, RF7320: LTE 20, RF7321: LTE 11 and 21 • Ultra-high LTE efficiency • Optimized use with DC-DC converter operation • Three power states with digital control interface • Integrated power coupler • Integrated blocking and decoupling capacitors • Applications: LTE wireless handsets and datacards ■ RFMD https://estore.rfmd.com 2.8 V to 4.2 V 915 MHz ISM Band Tx/Rx Module RFMD‘s new RFFM6901 is a singlechip front end module (FEM) for applications in the 868/915 MHz ISM Band. The RFFM6901 addresses the need for aggressive size reduction for typical portable equipment RF front end design and greatly reduces the number of components outside of the core chipset, thus minimizing the footprint and assembly cost of the overall solution. The RFFM6901 contains an integrated 1W PA, dual port diversity antenna switch, LNA with bypass mode, and matching components. The RFFM6901 is packaged in a 32-pin, 6.0 mm x 6.0 mm x 1.2 mm overmolded laminate package with backside ground which greatly minimizes next level board space and allows for simplified integration. Features • Tx Output Power: 30 dBm • Separate Rx/Tx 50 Ω Transceiver Interface • Antenna Diversity Switch • LNA with Bypass mode Applications • Wireless Automatic Metering Applications • Wireless Alarm Systems • Portable Battery Powered Equipment • Smart Energy • 868 MHz/915 MHz ISM Band Application • Single Chip RF Front End Module This device is currently available in production quantities. Pricing begins at .25 each for 100 pieces. ■ RFMD https://estore.rfmd.com Highly-Integrated FEM for Smart Metering/Smart Energy and ISM Band Applications RF Micro Devices, Inc. announced the availability of the RFFM6903 front end module (FEM). RFMD‘s highly-integrated RFFM6903 FEM meets or exceeds the system requirements for AMI/AMR smart meter applications operating in the 868 MHz/960 MHz frequency band. The FEM supports multiple applications, including Smart Energy/advanced metering infrastructure (AMI), portable battery-powered equipment, and general 868/915 MHz ISM band systems. The feature-rich RFFM6903 integrates a +30.5 dBm power amplifier (PA) with a Tx harmonic output filter in the transmit path, a Tx path bypass mode with harmonic filter, and a low-noise amplifier (LNA) with bypass mode in the receive path and is packaged in a 6 mm x 6 mm x 1 mm laminate package. The RFMD RFFM6903 also includes a low insertion loss, high isolation, single-pole threethrow (SP3T) switch and separate Rx/Tx 50 ohm ports that simplify matching and provide input and output signals for both the Tx and Rx paths. In the receive path, the Rx chain provides 16 dB of typical gain with only 5 mA of current and an excellent noise figure of 1.7 dB. ■ RFMD www.rfmd.com 46 hf-praxis 2/2013

RF & Wireless Wireless A new Multi-beam Hub Base Station antenna A new Multi-beam Hub Base Station antenna, model number MBA6-3.5DS45/2045, has been developed by Cobham Antenna Systems, Microwave Antennas to enable MIMO (multiple input multiple output) radio system operators to meet their goal of 1 Gbps/km anywhere within a cell. Designed for high speed MIMO 4G (and beyond) urban access for backhaul, this was originally a European Union funded project that has become a finished and available Multi-beam antenna with additional Military and Security beneficial applications. By removing barriers to next-generation network deployment, this Multi-narrowbeam antenna allows for a dramatic increase in capacity over existing communication systems. It provides an essential component enabling an improvement to the overall infrastructure capacity density of the current mobile network by an order of magnitude (10x). Projected deployment for this Hub Base Station antenna system is for it to communicate with network of "belowrooftop" Access Base Stations using existing structures. The system strategy with these access base stations will allow selfbackhauling. This Multi-beam antenna has 90º coverage (a 90º arc) utilising six individual narrow beam patterns each with a half power beamwidth of 15º. MIMO capability is provided with ±45º polarisation in each of the six 15º sectors. The advantage of this format is that a narrow beam can create high density coverage within a specific narrow area allowing for a high level of frequency re-use whilst being far more efficient that installing 6 separate narrow beam directional antennas. By positioning four Multi-beam antennas in a square formation, complete 360º coverage is achieved as this provides 24 dual-polarised beams. The current system benefits from meeting ETSI specification for Multi-beam antennas (EN 302 326-3 V.1.1.2) provides low side-lobe levels for greater system efficiency. For Security and Military applications the technology can be scaled to cover other frequency bands, with applications such as communications to multiple mobile platforms (ground or airborne). This system has the benefit of providing higher gain over a wider angle than a single sector antenna. Communications are more secure and less prone to intercept and jamming than Wide Beam or Omni antennas. The antenna measures only 586 mm (23") high x 456 mm (17.95") wide x 76 mm (3") deep, making it extremely compact given that it provides 2 x 6 beams each with 17 dBi peak gain. For dense urban deployment, this compact Multi-beam antenna will reduce wind-load on towers and the cost of installation compared with conventional alternatives. Technology The antenna element comprises a single cross-dipole assembly operating at a centre frequency of 3.5 GHz interlocked in a configuration which provides a slant dual polar beam. Eight sets of these assemblies are fed in phase through a stripline feed to create the single 110º sector antenna which forms the basis for the array. There are 8 sector antennas in the complete assembly. In order for the 6 (x2 polarisations) narrow beams to be formed to cover the 90º arc, two 8 x 8 Butler matrix beam forming devices are used to feed the separate ports of each antenna element. By a mechanism of fixed phase shifters and couplers the Butler matrices provide defined sets of phases into each of the 8 internal antenna elements which results in two sets of 6 skewed beams (The two outer ones covering ±60 degree are not currently used). Within the new unit the Butler matrix devices are fully integrated into the antenna eliminating the need for 16 phased-matched cables making for a much more efficiency and cost-effective antenna. In this antenna the down-tilt is a nominal 2º across the band of interest, i.e. 3.4 - 3.6 GHz with an elevation beamwidth of 10º to the half-power point. ■ European Antennas Ltd www.european-antennas.co.uk ■ Cobham Antenna Systems www.cobham.com Typical measured elevation pattern for each of the 6 beams within the array Measured azimuth patterns for the 6 x 15 degree beams showing how little degradation of gain there is across the set of patterns. Note each beam has two polarizations (±45 degree) hf-praxis 2/2013 47

hf-praxis

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