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vor 9 Jahren

9-2012

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HF-Praxis 9/2012

RF & Wireless Wireless

RF & Wireless Wireless Unique Wi-Fi ANT+ bridge can collect and send wireless sensor data to Internet „ANT+ wireless sensors are usually only designed to communicate out to about 3 m so have traditionally had to be tied to some kind of hub device such as a sports watch or USB stick to collect data,“ explains Joe Tretter, VP of Engineering at North Pole Engineering. „With the WASP you can move that ANT+ data straight to the Internet or some other end-point - such as a smartphone or tablet - using a low-cost Wi-Fi network.“ In operation the WASP is easy to use and highly robust. It has a single (screen) button on its OEM-brandable interface that users push to join a pre-configured Wi-Fi network and if for any reason the WASP can‘t join that network (a possible scenario in real-world operating environments) - they simply push the button again to instruct the WASP to create its own Wi-Fi network. It will then receive data automatically from any ANT+ device within the vicinity and send that to the Internet. And if it can‘t connect (another realworld possibility) it will store the data within its 16-MB internal memory and transmit it once it regains Internet access. ■ North Pole Engineering www.npe-inc.com Nordic ANT wireless connectivity tinyurl.com/NordicANT Nordic Semiconductor ASA announced that a unique Nordic nRF24AP2-based Wi-Fi to ANT+ bridge gateway device has been developed by U.S. electrical engineering specialist North Pole Engineering. The device allows wireless data from more than 60 ANT+ sensors to be recorded, analyzed, and uploaded to the Internet via Wi-Fi for the first time in applications such as group gym classes (e.g. indoor cycling, rowing, and aerobics), team sports, and remote health monitoring. Available now and called the ‚WASP‘, this portable Wi-Fi ANT+ bridge employs a classleading Nordic nRF24AP2-8CH 8-channel ANT Connectivity IC (integrated circuit or ‚chip‘) and essentially receives data from connected ANT+ devices at up to 1Mbps and translates the data into Wi-Fi packets, making it available to any Wi-Fi (IEEE 802.11 b/g/n) connected device. The WASP can also create its own 11 Mbps Wi-Fi network and so can be used outdoors powered by an internal rechargeable lithium-ion battery for up to 6-hours even in its most powerhungry continuous scan mode. AR‘s family of 1 - 2.5 GHz Microwave Amplifiers designed to provide an alternative to TWTAs AR RF/Microwave Instrumentation has introduced a line of solid-state microwave amplifiers that can offer an alternative solution to Traveling Wave Tube Amplifiers (TWTAs) and provide additional benefits to users. Models 100S1G2z5 (100 watts), 250S1G2z5 (250 watts) and 500S1G2z5 (500 watts) each cover the 1 - 2.5 GHz frequency range. Their cost and size is equivalent to TWTAs, but these new amplifiers also provide superior linearity, harmonic suppression, lower noise level, superior mismatch tolerance, and 100% rated power to any load. All of which adds up to better value and a reduced cost of ownership. The new family of amplifiers is ideal for EMC/ EMI, wireless, communication, multi-tone testing, radar, and research applications, as well as Software for those test applications where low distortion modulation envelopes are desired. ■ AR RF/Microwave Instrumentation www.arworld.us New release of the free Analog Devices SPICE Simulation Tool Analog Devices, Inc. announced a new release of the NI Multisim Component Evaluator - Analog Devices Edition. In collaboration with National Instruments the new version of the free tool adds features and functionality to provide engineers with an easy-to-use environment for the simulation of linear circuits using ADI components. The new release of the Multisim - ADI Edition includes more than 870 models of ADI‘s linear components. By pairing these components with intuitive simulation features and SPICE analyses, engineers can now visualise and evaluate linear performance, making this critical step of circuit design easier, faster and far more productive. The free component evaluation tool is available for download on ADI‘s website at http://www.analog.com/multisim. ■ Analog Devices, www.analog.com 48 hf-praxis 9/2012

RF & Wireless Software CST and Nuhertz present new filter design flow Filter design is a challenging task in electrical engineering that can be greatly simplified by the use of filter synthesis tools such as FilterSolutions by Nuhertz. FilterSolutions provides instant, accurate filter designs in various media including Distributed Line, Lumped Element, Digital and Active filters. Users are presented initially with a set of solutions that meet the transfer functions of the filter circuit. The designer can then select the most appropriate function, taking the required design characteristics such as size, materials or layout limitations into consideration. The real-world calculation of parasitic responses can also be considered. However, if a distributed filter design is considered, the analysis in FilterSolutions may not be sufficient to take 3-Dimensional elements and arbitrary coupling effects into account. The employment of a 3D electromagnetic field simulator is often required. CST and Nuhertz now provide a solution which enables users of FilterSolutions software to export their results directly into CST STU- DIO SUITE. Prior to exporting the Nuhertz filter design to CST STUDIO SUITE, the user is able to manipulate the pole and zero crossings of the filter. The design, including parameterization, is then transferred to CST DESIGN STUDIO where a block schematic representation is automatically produced as the basis of an automatically created 3D model. Using the new CST MICROWAVE STUDIO Method of Moments based multilayer solver a fast and accurate 3D analysis of the filter can be performed. System assembly and modeling (SAM), introduced with CST STUDIO SUITE 2012, helps users to add other 3D elements, such as connectors and housings, to the filter design, and facilitates the management and overall optimization of the complete design. About Nuhertz Nuhertz Technologies, LLC is the creator of design software for low and high frequency filter synthesis and analysis. FilterSolutions, a CAE program used to design and analyze filter networks, includes capability for the synthesis of digital filters, analog filters at arbitrarily low frequencies, and distributed element filters at RF and microwave frequencies.FilterSolutions software can instantly compute microstrip or stripline geometries to build distributed element networks from user-defined S- or G-transfer function values. Nuhertz also provides analysis tools to account for custom modifications and real-world parasitic effects. Engineers looking for active, passive and digital-filter designs will find this tool to be very helpful for lowpass, highpass, bandpass and bandreject filters. ■ Nuhertz www.nuhertz.com A narrated video describing the design verification of a Ring Resonator filter, designed in FILTERSOLUTIONS, and then exported into CST STUDIO SUITE, is available on the Nuhertz Technologies homepage, and can be viewed at http://www.nuhertz.tv/videos/ CST%20Studio%20Suite%20 RingRes_controller.swf. ■ CST http://www.cst.com CST Pushes Boundaries for Model Complexity There is an increasing need to model ever more complex devices more realistically. This helps avoid additional cost and time intensive prototyping cycles but can put a great strain on computational resources. The memory efficiency and the robustness of explicit time domain methods and the accuracy of the Perfect Boundary Approximation (PBA) have established the CST MICROWAVE STUDIO (CST MWS) transient solver at the forefront of large and detail rich electromagnetic field simulation. The upcoming release of CST MWS will now allow users to leave the 2 billion meshcell (more than 20 billion unknowns) limit behind them. By employing cluster computing, through a message passing interface (MPI) implementation, in combination with cutting edge Graphics Processing Unit (GPU) computing, CST MWS enables customers to tackle simulations of this size within a reasonable time frame. CST develops and markets high performance software for the simulation of electromagnetic fields in all frequency bands. Its success is based on the implementation of leading edge technology in a userfriendly interface. CST’s customers are market leaders in industries as diverse as Telecommunications, Defense, Automotive, Electronics, and Medical Equipment. Today CST employs 190 sales, development, and support personnel, and enjoys a leading position in the high frequency 3D EM simulation market. CST STUDIO SUITE is the culmination of many years of research and development into the most accurate and efficient computational solutions for electromagnetic designs. It comprises CST’s tools for the design and optimization of devices operating in a wide range of frequencies - static to optical. Analyses may include thermal and mechanical effects, as well as circuit simulation. CST STUDIO SUITE benefits from an integrated design environment which gives access to the entire range of solver technology. System assembly and modeling facilitates multi-physics and cosimulation as well as the management of entire electromagnetic systems. CST STU- DIO SUITE can offer considerable product to market advantages such as shorter development cycles, virtual prototyping before physical trials, and optimization instead of experimentation. ■ CST www.cst.com hf-praxis 9/2012 49

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