Feature Articles

  1. Highs And Lows Of Electronic Warfare

    For the US Army, the next chapter of electronic warfare (EW) is all about precision and low visibility. In a statement last month, Col. Mark Dotson said the Army’s new EW strategy is centered on, “using low power to affect the signal and to affect it in such a way that it may not even be detectable that you’re interfering with what they’re doing.”

  2. 5G New Radio eBook

    Is 5G simply another generation of mobile communications technologies? Or something revolutionary? In this eBook, Rohde & Schwarz give insights into 5G New Radio (NR), exploring all of its relevant details, key implementation aspects, and required test and measurement equipment for the development of 5G NR products.

  3. The Wi-Fi 6 Revolution Wakeup Call For Your Test Strategy

    The IEEE 802.11ax amendment (Wi-Fi 6) focuses on greater efficiency in wireless connectivity. While key attributes of this improved efficiency directly improve traditional Wi-Fi applications, these attributes will largely affect higher-density applications such as large offices, apartment complexes, airports, arenas, and outdoor stadiums. This white paper offers several ideas of how to make Wi-Fi 6 a reality.

  4. An Automated Software Suite For Determining Electrical Characteristics Of Travelling Wave Tubes

    Travelling wave tubes are vacuum devices with electron beams that couple to a microwave frequency electromagnetic signal propagating in the direction of the beam. Energy is transferred to the microwave signal, and the device generally behaves as an amplifier. A suite of software has been created, which allows very fast automated analysis of some types of travelling wave tube. This white paper delves into the design and use of this software to be used for determining the electrical characteristics of traveling wave tubes.

  5. Design Of Rugged High Voltage Power Supplies For Use In Low Noise Multimode Radar Transmitter Sub-Systems

    A radar transmitter is generally required to amplify a low noise coherent RF waveform. This waveform is generally provided by a radar RF exciter and can be fixed frequency, frequency chirped, or phase modulated during the radar transmitter pulse. It is important that the transmitter system amplifies this pulsed signal to a high power whilst maintaining its coherence and its fidelity. This paper covers an approach to the design of high voltage power supply units for operating traveling wave tube amplifiers in pulse doppler radar transmitter sub‐systems where ultra-low noise RF output is mandatory.

  6. Introduction To TMD Synthetic Aperture Radar Amplifiers

    Amplifiers for Synthetic Aperture Radars (SAR) or Imaging Radar, although evolved from general purpose radar transmitters, have special requirements associated with the application where it is used. TMD has been involved with ISAR, SAR, and GMTI since their inception in the early 1990s and have a reliable track record of reliable supply and operation performance.

  7. Cross-Coupling Between A 3G Transmitter And A Cable Bundle

    This paper explains how to compute cross-coupling effects between a cable bundle and 3G antenna mounted on a vehicle using the cable modeling interface in FEKO. It also demonstrates FEKO GUI elements useful for investigating the cross-coupling between transmitters and cable bundles.

  8. Antenna Factor Calculations And Deviations

    In recent years, the use of a term call "Antenna Factor" in EMC and spectrum pollution work has become very important. There has been a great need for measuring field intensity and/or power density as accurately and conveniently as possible.

  9. Receiver Protector: Theory Of Operation

    This article presents the reader with a basic understanding of receiver protector technology and discusses the various available types of receiver protector forms, their strengths and weaknesses, and how best to use them.

  10. Design And Performance Of High-Efficiency, Ka-band GaN Power Amplifiers

    This white paper reports the design and performance of state-of-the-art GaN MMICs and a fully packaged Ka-band SSPA. Incorporating harmonic tuning, the MMICs produce power levels up to 10 W CW with efficiencies in the high thirties (42% peak) at frequencies of 30 to 34 GHz.