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MWEE MARAPR 2014

Products manufacturer Premo. The ZC1003HF series is offered with 2.5 μH at 13,56 MHz inductance, but can be tailored to customer’s specifications. The antenna includes a high performance NiZn ferrite core material (>106 Ohm·m) and low initial permeability to work at high frequency. It provides a very stable performance in a wide range of temperature from -40ºC to +100ºC. The antenna offers better performance over metal parts ground planes or batteries devices. www.grupopremo.com 50 GHz low-loss RF coaxial cable assemblies Crystek has extended the frequency range of its high performance RF coaxial cable assemblies to 50 GHz. The latest 50 GHz low-loss RF cable assemblies feature corrosion-resistant 2.4 mm 303 stainless steel connectors and three levels of shielding for low attenuation (loss) over distance (1.44 dB/ foot at 50 GHz). They are in stock in standard lengths of 24” (61-cm), 39.4” (100-cm) and 48” (122-cm), with custom lengths available. Ideally suited for high-frequency interconnects in missioncritical applications and microwave laboratories, the cable assemblies (P/N series CC2450-MM-150) provide RF shielding of >90 dB with an operating temperature range of -55° to +85ºC. www.crystek.com MIMO test environment developed for satellite RF links During a multi-year study with the European Space Agency (ESA), Finnish electronics and software group Elektrobit (EB) has developed a test environment for multiple antennas (MIMO) in satellite communications. This software-defined radio based environments is now available to satellite operators and infrastructure vendors, enabling them to scrutinize RF link performance. MIMO is already widely accepted, but in satellite communications it still has to be adopted. In the ESA study EB fathomed out if, and to which extent MIMO could be beneficial in the context of satellite communications. To this end, the company carried out a literature study, followed by computer simulations and laboratory experiment with an existing satellite system. The MIMO test environment devised in this context is based on an earlier development, also by EB: RACE, a software-defined radio platform for the development, evaluation and demonstration of wireless technologies. The RACE platform connects computer simulations to existing RF interfaces and provides a smooth transition from simulation up to real-world implementation in small, controllable steps. The test environment also includes a sophisticated radio channel emulator. www.elektrobit.com Small transistors reduce footprint in smartphones, wearables The VML0604 from ROHM Semiconductor claims to be the smallest transistor in the industry ans is available in a 0.6 mm x 0.4 mm x 0.36 mm package. The transistor reduces board space by 50% compared with alternative offerings, making it ideal for smartphones and other devices requiring smaller, thinner form factors. For transistors in particular, in addition to technical challenges such as bonding stability and package processing accuracy, it has been especially difficult to decrease transistor size, resulting in higher ON resistances and maximum voltages in the 20 V range. ROHM, however, was able to successfully reduce package size and ON resistance while improving voltage resistance up to 60 V, providing breakthrough performance and reliability. New high precision package and transistor processes, combined with internal structure optimization, have allowed ROHM to successfully develop the smallest transistor package in the industry. This package will be expanded to small-signal MOSFETs, contributing to increased space-savings in a variety of offerings. As devices become smaller substrate mounting becomes increasingly difficult. In response, ROHM has maintained a 0.2 mm terminal gap that facilitates mounting using existing equipment. www.rohmsemiconductor.com Tiny multilayer diplexer for WLAN and Bluetooth circuits TDK Corporation has developed a multilayer diplexer in case size IEC 1005 for the implementation of 2.4 GHz and 5 GHz band WLAN in smartphones and other mobile devices. With its miniature dimensions of only 1.0 mm x 0.5 mm x 0.4 mm the DPX105950DT-6010B1 diplexer claims to be the smallest in the industry. The volume of the diplexer is more than 60 percent smaller than existing 1608 diplexers. In spite of the significant size reduction, the tiny diplexer provides equal or even better insertion loss and attenuation performance. For example, the maximum low band insertion loss at 2.4 to 2.5 GHz is just 0.5 dB, while the high band attenuation in the same frequency range is at least 25 dB. Mass production of the diplexer started in February 2014. www.tdk.com Cable assemblies offer low loss to 18 GHz Fairview Microwave has introduced a line of low loss test cables using LL335i and LL142 coax. Rated to 18 GHz, these low loss cable assemblies are ideal for test environments where a rugged, phase stable cable assembly is required. The company’s LL335i and LL142 cables allow for higher power transmission because the resulting higher temperatures do not have a negative effect on the cable due to the thermal stability of the PTFE tape dielectric. Where phase 24 Microwave Engineering Europe March-April 2014 www.microwave-eetimes.com


MWEE MARAPR 2014
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