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Electrically Small, Superdirective and Superconductive Antennas R.C. Hansen Wiley Interscience • 179 pages; $100 ISBN: 0-471-78255-6 The field of electrically small antennas has long been important for frequencies below roughly 1 GHz. These antennas have characteristics in common that limit performance: low radiation resistance, high reactance, low efficiency, narrow...

Application Note The Evolving Wireless Standards poster and application note are based on IEEE 802.16e mobile WiMAX. As a quick reference guide, the wireless poster highlights a range of information on the latest cellular and wireless connectivity technologies and applications. The “IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting”...

Because of their direct impact on system efficiency, phase noise and phase hits are major concerns in high performance communication systems. These systems rely on stable, low phase noise sources to increase capacity and reduce bit error rate (BER). Additionally, design cycle time, performance, quality and cost targets remain...

Phased arrays allow the electronic steering of an antenna beam in any direction and with high antenna gain by controlling the phase at each antenna element. This beam steering technique is much more compact and much faster than mechanically steered arrays. Furthermore, phased arrays allow the creation of deep...

A new 15,000 sq. ft. building has been completed at the site of AR 's worldwide headquarters in Souderton, PA. The three-story building houses the accounting department, customer service and a new machine shop on the first floor; expanded production facilities on the second floor; and a meeting room...

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...