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Industry News

Motorola Versus the Rest of the World: the Ultrawideband Battle

May 26, 2004
According to ABI Research, the possibility of obtaining consensus on a single ultrawideband (UWB) standard for wireless personal area networks (WPAN) has disappeared. There are two standards on the table, one proposed by Motorola and a couple of others, and the other proposed by nearly all the remaining industry...
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The Book End

May 26, 2004
High Frequency Techniques: An Introduction to RF and Microwave Engineering Joseph F. White Wiley-Interscience 502 pages; $94.95 ISBN: 0-471-45591-1 This book is intended for the undergraduate or graduate student who wishes to pursue a career in radio frequency and microwave engineering. It presumes that the student has access to...
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Raytheon Awarded $127 M US Army Contract for the Joint SLAMRAAM System

May 25, 2004
The US Army Aviation and Missile Command has awarded Raytheon Co. a $127 M contract for the US Army and US Marine Corps Surface Launched Advanced Medium Range Air-to-Air Missile (SLAMRAAM) System. Raytheon’s Integrated Defense Systems will lead Team SLAMRAAM to develop, fabricate, integrate and test the SLAMRAAM system....
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High Efficiency Power Amplifier Driving Methods and Circuits: Part II

May 19, 2004
Part I of this article 1 analyzed the driving circuits and methods for power amplifiers, using a low frequency approximation. This second part deals with the driving problem at high frequencies. Using a simple yet effective (for this purpose) active device model, the influence of the intrinsic feedback capacitance...
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Thin Film Barium Strontium Titanate (BST) for a New Class of Tunable RF Components

Thin film ferroelectrics (TFFE) are receiving increased attention because of their potential in producing tunable RF and microwave circuits. Tunable circuits, including filters, matching networks and phase shifters offer the flexibility to adapt to cha...
May 19, 2004
RF and microwave applications benefit greatly from the use of tunable devices and circuits. With components that can be tuned over a broad range, filters can be made to tune over multiple frequency bands of operation, impedance matching networks can be adjusted for amplifier power level or antenna impedance...
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Comparison of Coaxial Dipole Antennas for Applications in the Near-field and Far-field Regions

Coaxial antennas with properties similar to those of a two-wire dipole antenna are presented and analyzed. Since coaxial antennas extend along a straight line and can have almost any radius, they may be easily inserted into confined spaces that require...
May 19, 2004
Coaxial antennas with properties similar to those of a two-wire dipole antenna are developed and analyzed in this article. In order to simulate the characteristics of a two-wire dipole antenna with a 50 Ω coaxial line, the inner and outer conductors of the coaxial line are altered in specific...
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Predicting the EVM Performance of WLAN Power Amplifiers with OFDM Signals

This article details a method of predicting the error vector magnitude (EVM) of wireless local area network (WLAN) power amplifiers (PA). It starts with a definition and explanation of EVM, and explains the EVM specification as defined by the IEEE 802....
May 19, 2004
The 802.11a/g WLAN standards stipulate the use of orthogonal frequency division multiplexing (OFDM) signals with M-QAM symbols modulation, where M can be as high as 64. These wideband digital modulations demand PAs with high linearity, due to the inherent high peak-to-average ratio (PAR) of these signals. This article describes...
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S-band High Power Solid-state Amplifier Design and Development

The design and development of a 230 W power amplifier operating at S-band (2.35 to 2.45 GHz) is described. The motivation behind this development is the need for a microwave driver amplifier to be used in the linear accelerator facility at the Institut...
May 19, 2004
The starting point for the design of the S-band high power amplifier was that it had to meet the specifications given in Table 1 . These specifications are dictated by the actual operating conditions of the magnetron, which the amplifier is going to feed with microwave power. Solid-state technology...
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Design of a Novel Balun for a Star Configuration Double-balanced Mixer at S-band

A double-balanced mixer (DBM) has some advantages over other types of mixers. Ring and star configurations are available for the construction of a DBM. Between the two, the star configuration is preferred for high frequency operation. The star configur...
May 19, 2004
The merits of a doubly balanced mixer (DBM) include high dynamic range, good port-to-port isolation and rejection of even-order spurious responses. 1 The ring configuration, using two trifilar wound ferrite transformers, is most commonly used for DBMs at low frequencies. The application of a transformer DBM is, however, limited...
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Leading-edge SAW Filters for Short Range Devices

May 19, 2004
The last few years have seen the manufacturers of chips for short range devices (SRD) operating in the ISM frequency bands (315, 433, 869 and 915 MHz) significantly improving their products. Alongside this, SAW device manufacturers have been endeavoring to develop products offering the best solutions in terms of...
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