RF Military Electronics Featured Articles

  1. TD-LTE Technology And Its Measurements
    5/11/2009
    LTE, and particularly TD-LTE, brings new challenges to developers and to the vendors of design and test tools. New RF modulation schemes, MIMO antenna configurations, higher system bandwidths and capacity, and lower latency are just some of them. New measurement methods, including crossing the digital and RF domains, combined with a reduction in test point accessibility mean there’s a steep learning curve for both system and test developers. Successful technical introduction is a must, with analysts predicting between 30 and 80 million LTE subscribers and well over $100 billion in operator revenues within 5 years...
  2. White Paper: High-Speed Data Streaming For IF And Baseband Signals
    4/7/2009
    As wireless technology becomes more popular, there is an increasing need to monitor the spectrum. Military surveillance, satellite communications, spectrum monitoring, and other signal intelligence applications are a few areas where this need is most apparent. However, monitoring the spectrum frequently involves the difficult task of taking data at high sampling rates for extended periods of time. This article discusses the technology of high-speed data streaming, how it is used for IF and baseband data streaming, and the hardware and software that enable acquisitions or generations at high sampling rates for hours at a time.
  3. High-Speed Data Streaming For IF And Baseband Signals
    4/7/2009
    As wireless technology becomes more popular, there is an increasing need to monitor the spectrum. Military surveillance, satellite communications, spectrum monitoring, and other signal intelligence applications are a few areas where this need is most apparent. However, monitoring the spectrum frequently involves the difficult task of taking data at high sampling rates for extended periods of time. This article discusses the technology of high-speed data streaming, how it is used for IF and baseband data streaming, and the hardware and software that enable acquisitions or generations at high sampling rates for hours at a time.
  4. Microwave Operation Of A Diamond Field-Effect Transistor
    4/7/2009
    NTT Basic Research Laboratories (BRL) has developed a technology for growing high-quality diamond film, and, in collaboration with the University of Ulm, Germany, fabricated diamond field-effect transistors (FETs) using the film. These diamond FETs exhibited the highest cut-off frequency reported for diamond and showed the first amplification operation in the millimeter-wave range. Diamond FETs will replace the vacuum tubes currently used in the high-frequency, high-power regime and will enable us to greatly increase the output power of communications satellites and broadcasting stations.
  5. White Paper: Microwave Operation Of A Diamond Field-Effect Transistor
    4/7/2009
    NTT Basic Research Laboratories (BRL) has developed a technology for growing high-quality diamond film, and, in collaboration with the University of Ulm, Germany, fabricated diamond field-effect transistors (FETs) using the film. These diamond FETs exhibited the highest cut-off frequency reported for diamond and showed the first amplification operation in the millimeter-wave range. Diamond FETs will replace the vacuum tubes currently used in the high-frequency, high-power regime and will enable us to greatly increase the output power of communications satellites and broadcasting stations.
  6. White Paper: Upfront RF Planning Speeds System-Level Analysis
    4/7/2009
    High-frequency technology didn’t earn its reputation as black magic for no reason. Unlike low-frequency circuits, microwave circuits don’t behave in a totally predictable way, so "tweaking" has been an accepted mainstay of the microwave design approach/flow. Fortunately, high-frequency design tools have dramatically improved so that tweaking of prototype circuits is much less common, and today’s engineer has powerful tools that can make sense of the black magic. As this article will demonstrate, AWR’s Visual System Simulator (VSS) design environment, a comprehensive software suite for design and optimization of communications systems, provides insight early in the design process about how a circuit, subsystem, or system will perform, enabling designers to make changes up front in component values and circuit configurations with far less effort.
  7. Upfront RF Planning Speeds System-Level Analysis
    4/7/2009
    High-frequency technology didn’t earn its reputation as black magic for no reason. Unlike low-frequency circuits, microwave circuits don’t behave in a totally predictable way, so "tweaking" has been an accepted mainstay of the microwave design approach/flow. Fortunately, high-frequency design tools have dramatically improved so that tweaking of prototype circuits is much less common, and today’s engineer has powerful tools that can make sense of the black magic. As this article will demonstrate, AWR’s Visual System Simulator (VSS) design environment, a comprehensive software suite for design and optimization of communications systems, provides insight early in the design process about how a circuit, subsystem, or system will perform, enabling designers to make changes up front in component values and circuit configurations with far less effort.
  8. 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
  9. 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
  10. 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