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December 2010 [Components] Design A SPDT Switch For WiMAX Fourth-generation (4G) wireless communications systems such as WiMAX and the Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) platform are geared for high performance in terms of data rates for mobile and fixed wireless system users. To deliver that type of performance, they will need enhanced high-frequency components. One such component is presented here: a symmetrical absorptive-mode single-pole, double-throw switch for... October 2010 [Components] Study Reliability Of Radiated RFID Tags Radio-frequency-identification (RFID) systems have seen widespread use in supply-chain management as well as in healthcare industries.1-3 Hospitals have been investing massively in information technology (IT) to reduce operating costs and improve patient safety, and RFID is expected to become critical to healthcare organizations in achieving these goals. But passive UHF tags used to track equipment and inventory may need to withstand... August 2010 [Components] UWB Antenna Stops Two Bands Ultrawideband (UWB) wireless communications systems operating from 3.1 to 10.6 GHz offer low-power, high-speed links for a variety of applications. However, they must often compete with interfering signals from a number of existing transmitters that may fall within the wide UWB operating range. Of course, stop-band filters can be added to a system where needed to remove interference, but adding filters increases system complexity and cost. A better... November 2009 [Computer-Aided Engineering] Analyze BER Performance Of Wireless FSK Systems Modern communication systems employ digital modulation for a variety of reasons, including improved immunity to noise and channel impairments as well as enhanced security compared to analog modulation. In addition, advances in very large-scale integration (VLSI) and digital signal processing (DSP) technology have made digital modulation more cost effective than analog transmission systems. Digital transmissions accommodate digital error-control... August 2009 [Components] Rectangular DR Antenna Resonates At 3 GHz Ultrawideband (UWB) technology provides the means for high-datarate communications within the 3.1-to-10.6- GHz band authorized for UWB by the United States Federal Communications Commission.1 In order to best use that frequency band, filtering is essential. A proposed bandpass filter provides the bandwidth needed for UWB communications while incorporating a notch to reject any unwanted radio signals falling in the band. The notched band ... August 2008 [Test & Measurement] Design An X-Band Vivaldi Antenna, Part 2 Vivaldi antennas can provide excellent directional propagation at microwave frequencies. As introduced in Part 1 of this article (July Microwaves & RF), the Vivaldi antenna can be a simple design based on a tapered-slot-antenna (TSA) architecture. This concluding installment in this two-part article will compare measurements of a designed and fabricated X-band antenna with simulations from the Advanced Design System (ADS) software from Agilent ... July 2008 [Communications] Design An X-Band Vivaldi Antenna Antennas are essential to highfrequency communications and electronic systems for radiating or receiving electromagnetic (EM) energy. Although there are many types of antennas, they all operate according to the same basic EM principles. The basic behavior of an antenna can be described by its wave field strength, polarization, and direction of propagation.1 Key requirements in applications such as airborne radar and communications systems... |
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