Feature Articles

  1. Filter Shape Factor And Selectivity

    This article discusses how a real-world filter’s deviation from ideal behavior needs to be quantified and that shape factor and selectivity are tools to use in this process. It touches on how both resonator Q and the filter order (number of resonators in a design) can influence a filters behavior in the transition band. 

  2. Unlocking Full Duplex DOCSIS 3.1 Architecture With DPD And 75-Ohm CATV Switches

    The CATV industry is looking to set new standards for the next generation of cable ecosystems, including the Full Duplex (FDX) DOCSIS 3.1, which promises to deliver 10 Gbps data rates upstream and downstream on existing hybrid fiber-coaxial (HFC) systems. 

  3. Resource Scaling For Antenna Placement Modeling On A SAAB JAS-39 Gripen Aircraft

    This white paper demonstrates how resource requirements scale for the computational electromagnetic modeling of a modern fighter aircraft when the frequency increases. It also demonstrates how different simulation methods may be applied and how they scale relative to each other.

  4. Understanding 5G Coexistence Testing Requirements

    New 5G NR designs must meet target performance and coexist with 4G, Wi-Fi, and other wireless communication systems sharing overlapping spectrum. This white paper discusses 5G spectrum coexistence issues and presents techniques for minimizing interference and operating in shared spectrum.

  5. Optimizing Performance And Cost For Millimeter-Wave Signal Analysis

    mmWave systems considered for next-gen commercial wireless require test instrumentation that keeps pace with the performance requirements of these systems. This app note discusses advances in mmWave signal analysis and instrumentation.

  6. Using IEC 60601-1 For Maximum Patient And Operator Protection

    The IEC 60601-1 states maximum requirements concerning the protection from electric shock for medical applications in which patients and operators can get into direct contact with electrical equipment and systems. This white paper shows how supplier know-how can contribute towards the development of IEC 60601-1-compliant electrical equipment and systems based on the example of the ODU plastic circular connector series ODU MEDI-SNAP®.

  7. IoT Antenna Questions Answered

    This download offers answers for commonly asked questions on antennas used in IoT applications, including what the proper grounding plane is for certain antennas, and why antenna length is important to reception.

  8. 5 Antenna Decisions When Designing IoT Devices

    This download offers five considerations for what antennas to select in new designs for IoT devices.

  9. Design And Physical Realization Of Phased-Array Antennas For MIMO And Beam-Steering Applications

    A phased-array antenna is made up of multiple individual radiating elements and each is fed with an RF signal controlled through phase shifters in such a way that the radio waves from the separate antennas are added together to increase the radiation. The advantages inherent in phased-array systems will enable major new commercial applications, including 5G communications and automotive radar, to exploit the millimeter-wave (mmWave) spectrum. This white paper explores basic phased-array theory and the design considerations behind next-generation antenna systems, and examines the new capabilities recently added to electronic design automation (EDA) software such as the NI AWR Design Environment platform.

  10. Aperture Tuning: An Essential Technology In 5G Smartphones

    Antenna aperture tuning is essential to enable smartphones to operate efficiently over the ever-increasing range of RF frequency bands and support the transition to 5G. Smartphones need more antennas to support growing RF requirements such as new 5G bands, MIMO, and carrier aggregation (CA), but there is less space for these antennas due to changes in smartphone industrial design. As a result, antennas are becoming smaller, potentially reducing antenna efficiency and bandwidth. Aperture tuning compensates for this problem by allowing antennas to be tuned to operate efficiently on multiple bands and increasing Tx and Rx performance by 3 dB or more.