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May 2008 [Test & Measurement] Eliminate Fixture Effects On Device Measurements Increased accuracy has been an objective of the earliest vector network analyzer (VNA) measurements. By means of calibration and vectorerror- correction techniques, the accuracy of a VNA can be extended from the instrument ports to the ends of the test cables. When the device under test (DUT) connects directly to the test port cables, the calibration plane and the measurement plane are one and the same. In this case, calibration and error ... — David Ballo , et al. May 2008 [Devices & ICs] Large-Signal Approach Yields Low-Noise VHF/UHF Oscillators Last month, the first half of this article introduced the large-signal approach to oscillator design. This concluding section will offer some VHF/ UHF design examples, including the 144-MHz oscillator first presented last month in Part 1. The component values for the 144-MHz oscillator (C1, C2, C3, C4, and L) can be calculated in the following way. First, the values of capacitors C1 and... — Ajay Kumar Poddar , et al. May 2008 [Components] Multilayer Microstrip Forms Tunable Bandstop Filters Tunable bandstop filters are useful for a wide range of applications in eliminating unwanted signals and interference. Designing such filters can be greatly simplified with a new structure fabricated on multilayer microstrip substrates with a metallic diaphragm. This new structure overcomes the limitations of traditional tunable bandstop filter designs and supports simple, low-cost manufacturing processes.1 The new tunable filter... — Yamina Bekri , et al. May 2008 [Commercial] Reviewing GNSS Basics For Software Engineers Position tracking, using the Global Navigation Satellite System (GNSS), including Global Positioning System (GPS) and/or Galileo, is driving many consumer electronics applications. GNSS is no longer limited to automotive applications, surveying equipment, marine guidance, or expensive handheld tracking systems, but is now finding its way into many new cost-sensitive applications, including cellular handsets and Personal Navigation Devices (PNDs).... — Malcolm Lomer May 2008 [Systems & Subsystems] Modular Approach Provides Fast And Easy Prototyping Prototype development of RF and microwave designs can be tedious, requiring weeks or even months of engineering and construction time. For those who seek a faster, easier approach to the prototyping of new RF and microwave designs, however, MicroWaveCells (www.microwavecells.com) offers a new and innovative approach to building high-frequency circuit functions, subsystems, and complete systems in hours and days,... — Jenny Jiayan Shen 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.  prev. page
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