Wireless Design Online

Feature Articles

  1. White Paper: Wireless Signals As You’ve Never Seen Them
    2/15/2011
    Spectrograms are graphs which display signal power as a function of both time and frequency on a single plot. This article uses the software package Spectro VSA from Constant Wave to create high resolution images of various wireless signals. What these images reveal can lead to a new understanding of wireless signals. By Dr. Don Metzger, Constant Wave
  2. White Paper: Next Generation Time Domain Processing For Network Analyzers
    2/15/2011
    Time domain processing is a commonly selected option for Vector Network Analyzers. It gives the engineer an alternate view of the device under test’s (DUT’s) S-parameters. By Dr. Don Metzger, Constant Wave
  3. Active Inductor Oscillator Noise Dynamics
    2/4/2011
    The noise properties of active inductor resonator is studied. A design strategy centered on improving the quality factor of the active inductor is discussed for giving brief insights about the active resonator noise dynamics, and validated through an example, leading to a low cost high performance tunable active inductor oscillator (TAIO) for reconfigurable radio-frequency circuit solutions. By Ajay K. Poddar, Chief Scientist, Synergy Microwave Corporation
  4. Article: Active Inductor Oscillator Noise Dynamics
    2/4/2011
    In this article, the noise properties of an active inductor resonator are studied. A design strategy centered on improving the quality factor of the active inductor is discussed for giving brief insights about the active resonator noise dynamics, and validated through an example, leading to a low-cost, high-performance tunable active inductor oscillator for reconfigurable radio-frequency circuit solutions. By Ajay K. Poddar, Chief Scientist, Synergy Microwave Corporation
  5. Troubleshooting Passive Intermodulation Problems In The Field
    1/7/2011
    It is broadly understood that Passive Intermodulation (PIM) is a formidable issue within the cellular industry. This type of test has been in use for 15 years or more within the OEM industry throughout the world. As extra cellular transmitters and modulation formats are commissioned into service in new or existing sites, the statistical performance can appear to change dramatically. Ultimately, this can result in poor site/sector performance and reduced coverage, and this is why testing for PIM is now required in the field. The purpose of this article is to introduce the troubleshooting methods currently used in the cellular construction industry as well as to offer some background knowledge of Passive Inter-Modulation (PIM).By Nicholas Cannon, Anritsu Company
  6. White Paper: Troubleshooting Passive Intermodulation Problems In The Field
    1/7/2011
    It is broadly understood that Passive Intermodulation (PIM) is a formidable issue within the cellular industry. This type of test has been in use for 15 years or more within the OEM industry throughout the world. As extra cellular transmitters and modulation formats are commissioned into service in new or existing sites, the statistical performance can appear to change dramatically. Ultimately, this can result in poor site/sector performance and reduced coverage, and this is why testing for PIM is now required in the field. The purpose of this article is to introduce the troubleshooting methods currently used in the cellular construction industry as well as to offer some background knowledge of Passive Inter-Modulation (PIM).By Nicholas Cannon, Anritsu Company
  7. Proximity Effects In Closely-Spaced Surface Mount Passive Components
    1/5/2011
    Accounting for coupling effects that occur in circuits comprised of high frequency interconnects and surface mount devices (SMDs) is a complex problem. Very accurate equivalent circuits for the SMDs can be obtained through careful characterization and modeling, while numerical electromagnetic simulation tools can precisely capture the behavior of the interconnect traces. However, there is no consistent way to account for coupling between the SMDs and neighboring devices and/or traces. As a result, the performance of hybrid circuits with SMDs and traces in close proximity may prove difficult to predict. By Modelithics, Inc.
  8. Hybrid Finite Element Boundary Integral Method
    1/5/2011
    With recent improvements in the efficiency of integral equation solutions it is now possible to combine the integral equation procedure with the finite element method (FEM) in a hybrid Finite Element Boundary Integral approach (FEBI). This paper will discuss the application and advantages of FEBI for solving antenna and scattering problems. A set of benchmarks that demonstrate the accuracy and efficiency of this newly implemented procedure will be presented. Finally 2 examples that use the domain decomposition method (DMM) together with the FEBI will be discussed. By John Silvestro, ANSYS, Inc.
  9. White Paper: Hybrid Finite Element Boundary Integral Method
    1/5/2011
    With recent improvements in the efficiency of integral equation solutions, it is now possible to combine the integral equation procedure with the finite element method (FEM) in a hybrid Finite Element Boundary Integral approach (FEBI). This paper discusses the application and advantages of FEBI for solving antenna and scattering problems.
  10. Optimizing WLAN Test Systems For Measurement Speed: Four Ways To Reduce Measurement Time
    12/29/2010
    By National Instruments Corporation With increasing pressure to lower test costs, many RF test engineers face the challenge of reducing measurement time. As you might expect, wireless LAN (WLAN) device testing is no exception. Whether you are creating an automated test system for design validation or final production test, it has become increasingly important to optimize a test system for measurement speed.

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