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Anite , a leader in testing technology for the wireless industry, and Beceem Communications Inc. , a leading provider of chipsets for the mobile broadband market, announced that they have entered into a collaboration to enable customers to more effectively use their respective products. The collaboration is built upon...

SolidWorks Corp. , a leader in 3D CAD technology, and COMSOL , a worldwide leader in multiphysics simulation software, have strengthened their ties: SolidWorks has named COMSOL as one of its select Solution Partners. This program provides SolidWorks users with access to integrated products and services that can further...

Each new generation of wireless access technology has presented greater challenges than the previous generation for designers of RF power transistors and power amplifiers. For example, the emergence of digital modulation schemes and multi-carrier amplifiers placed more stringent requirements on linearity. Now, WiMAX is raising the bar even higher,...

The increasing importance of spectral efficiency in mobile communication services, such as wideband code division multiple access (WCDMA) and orthogonal frequency division multiplexing (OFDM), has resulted in a fluctuating signal envelope. The large peak-to-average power ratio (PAPR) of these modulations requires base station power amplifiers to have a high...

With the rapid growth of modern wireless communication technologies and markets, higher spectrum efficiency is required for higher data rates and larger capacity. As a result, high order digital modulations with high peak-to-average ratio are usually adopted to meet these requirements. Therefore, the dynamic range and linearity of the...

GaN devices now operate at much higher bias conditions than traditional PHEMTs or HBTs, and also dissipate DC power and generate RF power at much higher densities. Due to high RF and DC power levels, it was found that conventional CW device characterization and modeling techniques are no longer...

The Worldwide Interoperability for Microwave Access (WiMAX) system 1 is becoming quite popular in allowing broadband wireless Internet access for private and business users. WiMAX is based on the IEEE 802.16 family of standards. 2 Currently, the first system implementations, based on the 802.16-2004 specifications intended for fixed wireless...

Many various configurations and various substrate materials for ultra-wideband (UWB) applications have been investigated. Many printed broadband monopole configurations, 1–3 such as circular, semi-circular and square shapes, can achieve ultra-wideband characteristics, omni-directional radiation patterns, simple structures, light weight and low cost. The IEEE 802.15.3a standard 4 specifies the 3.1...

A ceramic-loaded resonator is a transmission line with one end shorted and the other “open” end connected to a capacitor to ground, as shown in Figure 1 . This shortens the length of the line needed to resonate at a particular frequency. The ceramic-loading capacitor overcomes the drawbacks of...

Published May 7, 2007 In an effort to better combine the editorial content of our magazine with our newly developed and retooled on-line presence, we have decided to expand Harlan's RF and microwave engineering advice into a monthly feature that appears in Microwave Journal. Harlan has selected one question...