RF Military Electronics Featured Articles

  1. Electromagnetic Analysis Of An Antenna Mounted On A Satellite Platform
    9/30/2009
    This article deals with the analysis of a complex antenna mounted on a satellite platform. The geometry of an Iridium satellite is considered, of which a constellation of 66 are at present employed in providing a global mobile communication service. The article gives readers an understanding of the present capabilities of CEM tools in relation to computational resources when dealing with real-world aerospace applications. By Matthys M. Botha and Ernst H. Burger, EM Software & Systems
  2. White Paper: Electromagnetic Analysis Of An Antenna Mounted On A Satellite Platform
    9/30/2009
    This article deals with the analysis of a complex antenna mounted on a satellite platform. The geometry of an Iridium satellite is considered, of which a constellation of 66 are at present employed in providing a global mobile communication service. The article gives readers an understanding of the present capabilities of CEM tools in relation to computational resources when dealing with real-world aerospace applications. By Matthys M. Botha and Ernst H. Burger, EM Software & Systems
  3. The Basics Of Patch Antennas, Updated
    9/24/2009
    This article introduces the basic concepts of patch antennas. A simple rectangular, half wave long, probe-fed patch operating in its fundamental mode is used as an example. Topics include principles of operation, impedance matching, radiation patterns, circular polarization, bandwidth, efficiency, alternative feed types, stacked patches and higher mode behavior. This article was originally published in September 2005. After it was published, the authors received substantial feedback from those who read it. The article has been revised based upon the feedback that was received. By D. Orban and G.J.K. Moernaut, Orban Microwave Products
  4. Technical Article: The Basics Of Patch Antennas, Updated
    9/24/2009
    This article introduces the basic concepts of patch antennas. A simple rectangular, half wave long, probe-fed patch operating in its fundamental mode is used as an example. Topics include principles of operation, impedance matching, radiation patterns, circular polarization, bandwidth, efficiency, alternative feed types, stacked patches and higher mode behavior. This article was originally published in September 2005. After it was published, the authors received substantial feedback from those who read it. The article has been revised based upon the feedback that was received. By D. Orban and G.J.K. Moernaut, Orban Microwave Products
  5. White Paper: Phase Coherent Multi-Channel RF Synthesis
    9/23/2009
    Multi-channel synthesis applications require specific performance parameters that are often overlooked with the design of single channel synthesizer systems. Performance specifications for multi-channel synthesis applications typically require channel to channel, short and long term phase coherence that is not possible with phase-locking an N-number of single channel synthesizers together. This configuration only creates a long term phase-lock ‘average’ between the outputs. Each individual synthesizer also contributes to the short term stability of this system, which is problematic with traditional phase locked synthesizers. By Jason Breitbarth and Joe Koebel, Holzworth Instrumentation
  6. Phase Coherent Multi-Channel RF Synthesis
    9/23/2009
    Multi-channel synthesis applications require specific performance parameters that are often overlooked with the design of single channel synthesizer systems. Performance specifications for multi-channel synthesis applications typically require channel to channel, short and long term phase coherence that is not possible with phase-locking an N-number of single channel synthesizers together. This configuration only creates a long term phase-lock ‘average’ between the outputs. Each individual synthesizer also contributes to the short term stability of this system, which is problematic with traditional phase locked synthesizers. By Jason Breitbarth and Joe Koebel, Holzworth Instrumentation
  7. White Paper: Crystal Oscillators: History, Parameters, And Types
    9/3/2009
    Precision quartz oscillators have been a mainstay of embeddable timing solutions for over half a century. Crystal oscillators are flexible and rugged, making them ideal for a wide range of applications, including military. This paper from Greenray Industries, Inc., covers oscillator types and defines and explains many of the parameters associated with crystal oscillators.
  8. White Paper: Crystal Oscillators: History, Parameters, And Types
    9/3/2009
    Precision quartz oscillators have been a mainstay of embeddable timing solutions for over half a century. Crystal oscillators are flexible and rugged making them ideal for a wide range of applications. Because of the versatility there are many types of crystal oscillators with unique attributes. This paper covers oscillator types and defines and explains many of the parameters associated with crystal oscillators. Attributes and parameters such as phase noise, jitter, short term stability, long term stability, and temperature performance are all covered. By John Esterline, Greenray Industries, Inc.
  9. Configuring Phase Coherent RF Measurement Systems: From MIMO To Beamforming
    8/19/2009
    Ever since the first radio waves were transmitted, engineers have continually sought new ways to utilized electromagnetic microwave signals. While RF signals have since been used for a wide variety of applications, two specific applications that utilize one common technology are wireless communications and radar. This article explains the technical requirements to configure a phase coherent RF generation or acquisition system. In addition, a step-by-step process to calibrate the phase delay between multiple RF analyzers to achieve the best possible performance is presented. By National Instruments Corporation
  10. White Paper: Configuring Phase Coherent RF Measurement Systems: From MIMO To Beamforming
    8/19/2009
    Ever since the first radio waves were transmitted, engineers have continually sought new ways to utilized electromagnetic microwave signals. While RF signals have since been used for a wide variety of applications, two specific applications that utilize one common technology are wireless communications and radar. This article explains the technical requirements to configure a phase coherent RF generation or acquisition system. In addition, a step-by-step process to calibrate the phase delay between multiple RF analyzers to achieve the best possible performance is presented. By National Instruments Corporation