RF Military Electronics Featured Articles

  1. White Paper: How RF Anechoic Chambers Work
    3/18/2009
    A radio frequency "anechoic chamber" is a shielded room whose walls have been covered with a material that scatters or absorbs so much of the incident energy that it can simulate free space. Its origins can be traced to efforts to build aircraft which absorbed or scattered radar signals during the Second World War. Recent innovations, such as the use of ferrite tiles, have greatly enhanced performance of these chambers. Anechoic chambers may seem to operate through a bit of black magic, but the analysis of how they work is really quite straightforward. By Dr. Glen Dash, Ampyx LLC
  2. Design Guide: Basic Considerations For Specifying RF And Microwave Filters
    3/12/2009
    As one of the fundamental signal processing components in RF and microwave circuits, the filter plays a critical role in determining any system’s ultimate performance. Since the electromagnetic spectrum has become more and more densely populated, filter performance has taken on greater significance than ever because interference rejection is of paramount importance. By Anatech Electronics
  3. Design Guide: Basic Considerations For Specifying RF And Microwave Filters
    3/12/2009
    Specifying a particular filter for a given system invariably requires a trade-off between a wide variety of factors, including power handling, Q factor, insertion loss, intended operating frequency, size, packaging and mounting, manufacturability, and many other parameters. Consequently, rather than providing a highly-academic discussion about filter designs and characteristics, this design guide has been created to provide a simple, thumbnail sketch of the most popular filter types (LC, ceramic, cavity, surface acoustic wave (SAW), crystal, and helical) along with the advantages and disadvantages of each in various applications. By Anatech Electronics
  4. Miniature Power Modules Enable 40 Watts Over 20 MHz To 512 MHz
    2/25/2009
    Recently released "RF power blocks" from M/A-COM Technology Solutions enable high power output over the 20 MHz to 512 MHz frequency band. Operating from a single 28V power supply, the new amplifier modules can be used to replace and shrink multi-component discrete circuits in military and commercial communications systems, such as SINCGARS. The modules are compatible with analog, digital and video waveforms used in ground-to-ground, ground-to-air and SATCOM links.
  5. White Paper: Miniature Power Modules Enable 40 Watts Over 20 MHz To 512 MHz
    2/25/2009
    Recently released "RF power blocks" from M/A-COM Technology Solutions enable high power output over the 20 MHz to 512 MHz frequency band. Operating from a single 28V power supply, the new amplifier modules can be used to replace and shrink multi-component discrete circuits in military and commercial communications systems, such as SINCGARS. The modules are compatible with analog, digital and video waveforms used in ground-to-ground, ground-to-air and SATCOM links.
  6. Applying Computational Methods To Test Site And Antenna Design
    2/11/2009
    Antennas commonly used in EMC work include dipole, conical, log periodic, and horn types. These are used on calibrated test sites for precision measurements. In the past, engineers had to rely on electromagnetic theory along with good deal of trial and error to design antennas and test sites. Today, we have computational tools that engineers of 30 years ago could only have dreamed of.
  7. White Paper: Applying Computational Methods To Test Site And Antenna Design
    2/11/2009
    Antennas commonly used in EMC work include dipole, conical, log periodic, and horn types. These are used on calibrated test sites for precision measurements. In the past, engineers had to rely on electromagnetic theory along with good deal of trial and error to design antennas and test sites. Today, we have computational tools that engineers of 30 years ago could only have dreamed of.
  8. Custom Filter Design
    2/6/2009
    Filters are used in communication and radar systems to reject undesired signals and pass desired signals. This characteristic of filters allows them to be used at many different points in a system. This article discusses the frequency limits of lumped elements for realizing microwave filters. A specific example is given to illustrate the bandwidth limitation of lumped elements and a lumped element filter result is shown. Second, results on a 3 GHz interdigital band pass filter are shown. Third, an X-band coupled line filter is presented. By Microwave Packaging Technology, Inc.
  9. White Paper: Custom Filter Design
    2/6/2009
    Filters are used in communication and radar systems to reject undesired signals and pass desired signals. This characteristic of filters allows them to be used at many different points in a system. This article discusses the frequency limits of lumped elements for realizing microwave filters. A specific example is given to illustrate the bandwidth limitation of lumped elements and a lumped element filter result is shown. Second, results on a 3 GHz interdigital band pass filter are shown. Third, an X-band coupled line filter is presented. By Microwave Packaging Technology, Inc.
  10. High Frequency Single And Multi-Chip Modules Based On LCP Substrates
    2/5/2009
    Labtech Microwave has produced modules for MMIC’s (microwave monolithic integrated circuits) based on LCP (liquid crystal polymer) substrates for many applications ranging from Ka band to >90 GHz. A wide range of structures are available to cater for a broad range of frequencies and thermal requirements. Near hermetic performance can be obtained from correctly configured LCP modules.