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April 2008 [Computer-Aided Engineering] EM Simulator Models Acoustic/Electric Designs Simulating a high-frequency device before it is built can help avoid pitfalls in its design and manufacturing. Fortunately, engineers faced with predicting the behavior of RF and microwave circuits have a wide array of electromagnetic (EM) solvers to choose from, although selecting an optimum simulation tool should require consideration of some practical guidelines. There are several classes of solvers, with each best suited to a... — Marco Farina April 2008 [Components] Large-Signal Approach Yields Low-Noise VHF/UHF Oscillators Oscillator design for veryhigh- frequency (VHF) and ultra-high-frequency (UHF) applications has been well documented in books and journals. Most early work focused on frequency stability and, to a lesser extent, on efficiency and output signal quality. But with increasing use of advanced modulation formats in communications systems, and the growing need for oscillators with... — Ajay Kumar Poddar , et al. April 2008 [Components] Cut Loss In Low-Voltage, Wideband PIN Attenuators Variable attenuators based on the pi (p) configuration can be designed with frequency coverage spanning multiple octaves, from the high-frequency (HF) range to the lower microwave region. As a result, they are suitable for numerous wideband applications, such as in satellite television and cable-television (CATV) systems. The use of PIN diodes in these attenuators enables them to be realized as low-cost components and compact alternatives to ... — Chin-Leong Lim March [Communications] Design An Integrated Oscillator/Antenna This design tightly integrated an active oscillator with a microstrip patch antenna for miniaturization in WLAN, Bluetooth, and other 2.45-GHz systems. R. A. Abd-Alhameed, D. Zhou, C. H. See, P. S. Excell, A. Ghorbani, and N. J. Mcewan Mobile and Satellite Communications Research Centre, Bradford University, Bradford, BD7 1DP, United Kingdom; e-mail: r.a.a.abd@bradford.ac.uk. Miniaturization... — R.A. Abd-Alhameed , et al. March [Test & Measurement] 12-Port VNA Characterizes Crosstalk On High-Speed Lines This 12-port vector network analyzer and novel multiport calibration algorithm combine for signal-integrity analysis on transmission lines and devices at multi-Gigabit speeds. Harry Momjian Marketing Manager Anritsu Co., 490 Jarvis Dr., Morgan Hill, CA 95037-2809; (408) 778-2000, FAX: (408) 776-1744, E-mail: harry.momjian@anritsu.com, Internet: ... — Harry Momjian March [Components] Analyze EM Parameters Of Slotted Tube Couplers This numerical method accounts for thickness effects in determining the coupling coefficient as well as the even-and odd-mode impedances for slotted tube couplers. Abdelhafid Lallam Assistant Professor of Physics University of Mascara, BP 305 Route de Mamounia 29000 Mascara, Algeria; (045) 80-41-68/69, FAX: (045) 80-41-64, e-mail: ab_lallam@yahoo.fr Nadia Benabdallah Physics Engineer ... — Yamina Bekri , et al. February [Communications] RF Power Calibration Aids Wireless Transmitters Wireless transmitters can benefit from measurement and control of RF power. Because of such factors as regulatory requirements and the need to co-exist with other wireless networks, the RF power levels of wireless transmitter high-power amplifiers (HPAs) must be monitored and controlled. The precision and accuracy of these measurements can result in improved transmitter spectral performance as well as significant savings in operating cost for an... — Eamon Nash February [Components] GaN Devices Arm Distributed Amplifier Broadband, high-efficiency power amplifiers serve a wide range of military applications in present and future communications and navigation systems. But amplifier designers are limited in performance by the active devices available to them. Fortunately, the growing availability of wide-bandgap semiconductor devices, such as silicon carbide (SiC) and gallium nitride (GaN) transistors, is clearing the way for broadband, high-efficiency power amplifiers... — Anthony Pavio , et al. February [Commercial] Assemble High-Power Attenuator Systems High-power signal processing and testing requires the use of highfrequency attenuators designed to handle large signals without damage or performance degradation. Especially when working with signals exceeding 1 kW, as common in commercial broadcast and military radar systems, reliable attenuators are critical to any test system. Most attenuators on the market rely on thick or thin film resistive designs screen printed or deposited on a flat... — Dave Distler January 2008 [Test & Measurement] Configure An RF ATE System These basic guidelines help in the selection of the test instruments and software needed to assemble an effective RF and microwave automated test equipment (ATE) system. DENIS GABLE Director of Frequency Synthesizer Engineering Wide Band Systems, Inc., 389 Franklin Ave., P. O. Box 289, Rockaway, NJ 07866; (973) 586-6500, FAX: (973) 627-9190, e-mail: dgable@widebandsystems.com, Internet: ... — Denis Gable January 2008 [Test & Measurement] Determine Twisted-Line Characteristic Impedance This approach shows how to calculate and measure the characteristic impedance of balanced twisted bifilar transmission lines using a commercial vector network analyzer. ANTONIO ALVES FERREIRA JUNIOR Electronic and Electrotechnical Department National Telecommunications Institute (INATEL), 510 João de Camargo Ave. 37540-000, Santa Rita do Sapucaí, Minas Gerais, Brazil; e-mail: ... — Antonio Alves Ferreira, Jr. , et al. January 2008 [Test & Measurement] Power Meters Make Connections Via USB For many applications, USB-enabled RF/microwave power meters can provide all the measurement capability and increased flexibility compared to conventional instruments. Craig Allardice Systems Consultant, Satori Technology Ltd. e-mail: craig.allardice@satori-technology.com Tony Lymer Principal Engineer Satori Technology Ltd., 1 Biggar Business Park, Market ... — Craig Allardice , et al. January 2008 [Devices & ICs] Tracking Advances In Probing Mixed-Mode RF Circuitry Refinements in both the measurement probes and the calibration standard structures used with them makes it possible to perform more accurate microwave VNA S-parameter measurements on differential devices. Larry Dangremond Senior Product Manager For Probes and Signals Cascade Microtech, Inc., 2430 NW 206th Ave., Beaverton, OR 97006; (503) 601-1000, FAX: (503) 601-1002, Internet: ... — Larry Dangremond December 2007 [Devices & ICs] Optimizing MMICs For Encapsulated Packages Traditionally, monolithic microwave integrated circuits (MMICs) have been designed for function and performance, but without much forethought for package options. Packages were often developed after the circuit, and this "second-thought" approach would result in loss of circuit performance. A more practical approach is to perform accurate design of high-frequency MMICs for the package itself, in particular, for fully encapsulated packages. By... — Matthew R. Coutant , et al. December 2007 [Computer-Aided Engineering] Simulating WiMAX System Performance Rapid growth of Wireless Interoperability Microwave Access (WiMAX) as a broadband wireless technology is expected due to increasing demand for convenient Internet access and highspeed data access. In order to construct wideband wireless systems such as WiMAX, however, effective modeling must be performed. In this report, wideband modeling was performed on key elements of a WiMAX system, notably the modulator, frequency upconverter, and... — Kostas Stefanou , et al. December 2007 [Components] Estimate Microstrip Substrate Relative Dielectric Constant Firas Mohammed Ali Al-Raie Department Head The Polytechnic Higher Institute of Yefren, Libya, Department of Electronic Engineering, e-mail: firas@ieee.org Microstrip lines are commonly used in microwave circuits, although their performance is subject to the type of substrate material selected for a printed-circuit board (PCB). One of the more important material parameters for the substrate is the... — Firas Mohammed Ali November 2007 [Devices & ICs] Designing MMIC Distributed Amplifiers Distributed amplifiers offer moderate to high gain over broad frequency ranges. They have been designed with transmission lines as input and output feeds for some time. An early paper (1948) by Bill Packard (co-founder of Hewlett-Packard Co.) even showed how to use vacuum tubes for amplification in a distributed design.1 As GaAs monolithic-microwave-integrated-circuit (MMIC) technology developed and different types of amplifiers were fabricated ... — John E. Penn November 2007 [Components] Power Modules Provide Solutions For L/S-Band Pulsed radar systems consume power, in both operation and from the RF devices in the system. To feed the power needs of modern pulsed RF radar systems, a series of Lband and S-band power solutions modules (PSMs) has been developed by the Power Products Group of Microsemi (www.microsemi.com) for pulsed radar applications. These PSMs, currently available in bands of 1200 to 1400 MHz, 2700 to 3100 MHz,... — Jerry Chang November 2007 [Devices & ICs] Developing Designs For CMOS Power Amplifiers Widespread adoption of wireless technology has created market demands for highly integrated circuits, such as a transmitter, receiver, and frequency synthesizer on a single chip. Silicon CMOS technology has made such integration possible with the exception of the power amplifier (PA), which is still typically implemented in non-CMOS technologies. Ideally, silicon CMOS PAs can be developed for tight integration with other wireless building blocks.... — Louis Fan Fei November 2007 [Components] Analyzing A Resonator For MRI Applications Magnetic-resonance-imaging (MRI) systems can produce high-resolution images of cross sections of human bodies, proving to be invaluable for medical diagnostics. An important component in an MRI system is the RF probe used to emit a uniform RF magnetic field over the section of the human body under investigation and needed to receive the magnetic-resonance signals from the body for constructing high-quality images. What follows is an electromagnetic ... — Nadia Benabdallah , et al.  prev. page
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