RF Military Electronics Featured Articles

  1. White Paper: A Low Profile, Low ESL, Multi-Anode "Mirror" Tantalum Capacitor
    1/14/2009
    Traditional tantalum capacitors have been known for their excellent reliability, robustness, and stable parameters. This is why conventional tantalum capacitors with counter MnO2 electrode are still a popular type of capacitor used for long life and high reliability applications. One of the downsides of the MnO2 electrode system is its higher ESR compared to the polymer type of tantalum capacitors. The multi-anode concept reduces ESR and is suitable for demanding applications such as servers and high power telecommunication boards. This article describes a novel multi-anode configuration that has been developed to reduce the height of the components, reduce manufacturing costs, and self inductance ESL. By AVX Corporation
  2. A Low Profile, Low ESL, Multi-Anode "Mirror" Tantalum Capacitor
    1/14/2009
    Traditional tantalum capacitors have been known for their excellent reliability, robustness, and stable parameters. This is why conventional tantalum capacitors with counter MnO2 electrode are still a popular type of capacitor used for long life and high reliability applications. One of the downsides of the MnO2 electrode system is its higher ESR compared to the polymer type of tantalum capacitors. The multi-anode concept reduces ESR and is suitable for demanding applications such as servers and high power telecommunication boards. This article describes a novel multi-anode configuration that has been developed to reduce the height of the components, reduce manufacturing costs, and self inductance ESL. By AVX Corporation
  3. Designing Log Periodic Antennas
    1/7/2009
    In 1957, R.H. DuHamel and D.E. Isbell published the first work on what was to become known as the log periodic array. These remarkable antennas exhibit relatively uniform input impedances, VSWR, and radiation characteristics over a wide range of frequencies. In essence, log periodic arrays are a group of dipole antennas of varying sizes strung together and fed alternately through a common transmission line. Still, despite its simplicity, the log periodic antenna remains a subject of considerable study even today. By Dr. Glen Dash, Ampyx LLC
  4. White Paper: Designing Log Periodic Antennas
    1/7/2009
    In 1957, R.H. DuHamel and D.E. Isbell published the first work on what was to become known as the log periodic array. These remarkable antennas exhibit relatively uniform input impedances, VSWR, and radiation characteristics over a wide range of frequencies. In essence, log periodic arrays are a group of dipole antennas of varying sizes strung together and fed alternately through a common transmission line. Still, despite its simplicity, the log periodic antenna remains a subject of considerable study even today. By Dr. Glen Dash, Ampyx LLC
  5. White Paper: Oscillator Phase Noise: Theory Vs. Practicality
    11/5/2008
    One of the major issues facing oscillator designers is the phase noise phenomenon. Phase noise is an undesirable entity that is present in all real world oscillators and signal generators. It can cause distortion or complete loss of incoming information in traditional receivers, and high bit error rates in phase modulated applications. It is, therefore, necessary to understand and to quantify phase noise so that its effects on the higher level product are minimized. By Greenray Industries
  6. Guest Column: Meeting The Test Challenges Of 4G LTE
    9/29/2008
    As RF designers work rapidly to create products that support the new long term evolution (LTE) cellular wireless standard, understanding the new test requirements for LTE assumes ever greater importance as this technology becomes more widespread. For the wireless industry, these changes are nearly as significant as the move from analog to digital, requiring new measurements and new test equipment. This article looks at what LTE is and the main challenges to testing for engineers.
  7. Meeting The Test Challenges Of 4G LTE
    9/29/2008
    As RF designers work rapidly to create products that support the new long term evolution (LTE) cellular wireless standard, understanding the new test requirements for LTE assumes ever greater importance as this technology becomes more widespread. For the wireless industry, these changes are nearly as significant as the move from analog to digital, requiring new measurements and new test equipment. This article looks at what LTE is and the main challenges to testing for engineers
  8. Electronic Warfare: The Changing Face Of Combat
    9/25/2008
    Electronic Warfare (EW) is the struggle for control of the electromagnetic spectrum — to assure that friendly forces can use the spectrum to their full potential in wartime, while denying that use to enemies. U.S. military success depends on unfettered access to the spectrum to enable electronic equipment such as radars, communication links, computer networks, and sensors to work. The purpose of this report is to discuss the challenges and opportunities facing electronic warfare today and recommend steps to secure a durable and viable electronic warfare capability for the future. By The Association of Old Crows (AOC)
  9. Report -- Electronic Warfare: The Changing Face Of Combat
    9/25/2008
    Electronic Warfare (EW) is the struggle for control of the electromagnetic spectrum — to assure that friendly forces can use the spectrum to their full potential in wartime, while denying that use to enemies. U.S. military success depends on unfettered access to the spectrum to enable electronic equipment such as radars, communication links, computer networks, and sensors to work. The purpose of this report is to discuss the challenges and opportunities facing electronic warfare today and recommend steps to secure a durable and viable electronic warfare capability for the future. By The Association of Old Crows (AOC)
  10. Say What? My Cross-Talk Problem Is At The Component Level? A Filter, You Say?
    9/19/2008
    The devil is in the details. For system engineers who work for U.S.-based manufacturers of RF and microwave products, that seems to be the message they are painfully discovering. As their products get rushed into the marketplace and put to the test by wireless service providers and consumers, shortcomings in frequency management come home to roost in the form of noise, cross-talk, signal dropouts and even complete transmission interruption. While the product design holds up under scrutiny on paper, test engineers are increasingly rooting out the source of the problem, and oftentimes the solution turns out to be one single component: the filter. By Anatech Electronics Inc.