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Helical type resonators are widely used for frequencies below 0.5 GHz, mainly for mass and dimensional considerations. Replacing the more traditional TEM combline types or dielectric resonators by helical resonators significantly reduces the size and mass of the filters at the expense of the insertion loss. The rather complicated...

Current research studies are drawing more and more attention on the memory effects of high power amplifier linearization, especially for cellular base transceiver system applications. 1,2 Although many studies on power amplifier linearization have been conducted, linearization of strongly nonlinear systems with large memory, which exacerbates the performance of...

Kulicke & Soffa Industries Inc. closed the previously announced purchase of Alphasem, a supplier of die bonder equipment, from Dover Technologies International Inc., a subsidiary of Dover Corp. The purchase price was $27.1 M in cash, after a working capital adjustment and subject to further post closing adjustments. "We...

Comtech Telecommunications Corp. announced that its Tempe, Arizona-based subsidiary, Comtech EF Data Corp. , received a $2.8 M order from a leading communications integrator for its turboIP® performance enhancement proxy. The units will be deployed to support US Government installations around the world. Comtech EF Data's turboIP performance enhancement...

Keithley Instruments Inc. , a leader in solutions for emerging measurement needs, announced it has partnered with Mesatronic Group , Voiron, France, to develop advanced probe cards for semiconductor parametric testers used in RF and low current DC applications. William Merkel, marketing director for the Keithley Parametric Test Product...

The need for broadband wireless access (BWA) has long been acknowledged as the next step in the evolution of Internet access. Unfortunately, the lack of robust technology at a competitive price has been a barrier to its implementation. Today, though, momentum to cross the chasm is gathering—early adopters have...

With the blessing of the WiMedia Alliance, the stage is set for widespread implementation of certified wireless USB and next-generation Bluetooth 3.0 products, using multi-band orthogonal division modulation (MB-OFDM)-based ultra-wideband (UWB) physical layer (PHY). Wireless USB supports data rates of 53.3, 80, 106.7, 160, 200, 320, 400 and 480...

The demand on mobile communications has grown over recent years. Today’s mobile communication systems use sophisticated signal processing to achieve high transmission rates. The challenges for the next generation wireless systems will increase even further, when designs will need to meet multi-standards and achieve reconfigurability. Evaluations of various integration...

Mobile radio technology, based on the universal mobile telecommunications system (UMTS), is developing at breakneck speed. Network operators worldwide are currently upgrading their networks with new high speed downlink packet access (HSDPA) technology, which optimizes the data transmission from the network to the user equipment (downlink). New transmission methods...

Microwave Amplifier Brochure The Microwave Amplifier Brochure from AR Worldwide RF/Microwave Instrumentation features a wide range of microwave amplifiers. The brochure highlights the “S” and TWT amplifier series that covers 1 to 4000 W and 0.8 to 40 GHz and includes photographs, descriptions, specifications and performance graphs for each...