Product Bulletin – Integrate RF Surge and Lightning Protection Without Paying a Size or Weight Penalty!

The Neverending Quest For Size Reduction

As with most technologies, RF and Wireless system design is an ever-changing and shifting world.  As certain technologies or RF bands become popular, others fade away.

However, the one ever-present force on the industry is the steady, but relentless, push towards smaller size and better integration over time.

Lightning/Surge Protection at the PCB Level?

Here at NexTek we understand the desire to bring things into the box, or even all the way onto the Radio PCB… However, we also know that Lightning Transients contain too much energy to deal with safely at the PCB Level… Trace widths, ground place areas, and the components themselves all become limiting factors that will prevent complete and effective protection.

Given this reality, the last place where it is reasonable and safe to protect against Lightning or other Surge events is at the radio’s box or chassis level.  By replacing the normal I/O connector with a protected version, designer can ensure that they have high-performance protection without paying any significant size or weight penalty.  As long as the radio’s chassis is grounded well, the bulk of the Transient Energy will be drained safely to ground before entering the box and/or the PCB itself.

It may still be advisable to install some simple protection on the PCB, but only for final clean-up…Something like a small Protection Diode coupled with a DC Blocking Capacitor (if possible for your application) would provide plenty of protection against any residual energy that gets past the Protected I/O Connector.

Maximum Protection in the Minimum Amount of Space

Below, you can see an array of our Ultra-Compact protection options…  They all include high-performance lightning protection, and are available in a wide variety of connector configurations on both the Input and Output side.compact-arrestors

Outside Connector Options – Type N, TNC, SMA

Inside Connector Options – SMA, MMCX, RG188, RG316, and more!

Threat Types – Lightning, Static (ESD), and EMP

Learn More

Ultra Compact Protection – Home Page

Ultra Compact Protection Product Bulletin – Post

Compact Lightning Protection for Radios Operating Up To 12.5GHz – High Performance G-Class Arrestors

LIghtning Arrestor, TNC to SMA, Bulkhead-Mount, DC to 12GHz

Available with SMA and TNC connectors, our G-Class arrestors (The PTCSAFSAF20G and the PTCTNFSAF20G, for example) cover a wider RF Band than any other coaxial protection design in the world.  Because of the exceptional wideband performance from DC all the way up to 11 or 12.5GHz, there is no arrestor available today that will cover the same number of potential applications.  When the wideband ratings are combined with the extremely small form factor of these units, there is truly no other arrestor out there which can come close.

These units are perfect for retrofit or other installations where space is at a premium, or those who simply want a high quality protector that takes up minimal space!  In fact, these fully featured lightning arrestors barely take up any more space than a typical connector feedthru that contains no protection at all!
Also, keep in mind that like all NexTek solutions….
  • All G-Class arrestors are Designed, Engineered, Assembled, and Tested here in the United States!
  • This design incorporates 30 Years of Experience and Expertise into every feature and detail.
  • They are truly High Quality Advanced Designs, ready for the most demanding applications.


If you would like to see for yourself, just ask us for a Sample or More Information!

Learn More

PTCSAFSAF20G – SMA to SMA, DC to 12.5GHz


PTC Series – Product Family Page

Product Design Spotlight – EMI Filters: High Frequency Filtering Performance

High Current Feedthrough Filter - Installation ExampleAs one of NexTek’s primary product lines, our range of High Current Feedthrough EMI Filters incorporate some advanced design features which make them unique. NexTek HPR Series filters are high-performance, military-grade designs that are built under stringent quality control systems and procedures. This post will focus on the High Frequency Filtering performance of NexTek’s HPR Series of EMI/RFI filters.

Why does High Frequency Filtering Performance matter?: The primary purpose of a feedthrough EMI/RFI filter is to eliminate radio frequency noise from a power cable. Maintaining adequate filtering performance to 1GHz and above ensures that noise in this frequency range can be effectively removed.

How do NexTek Solutions Differ?: Available high-current feedthrough filter solutions from other manufacturers’ do not use the same type of design, and this means that their filtering performance (as limited by the package and overall design) reaches a peak value and then falls off quickly afterward. In this case, maximum insertion loss is only achieved over a narrow band and the filter’s performance in the upper

C-Type Filter Comparison
C-Type Filter Comparison – NexTek HPRs Use Ceramic Caps (Red Line)

MHz ranges is limited and continues to get worse as the frequency rises.

With the HPR series, the design has been optimized to maintain excellent filtering and loss characteristics to and beyond 1GHz. There is no other C-type filter family available with similarly excellent high-frequency performance.

Practical Example: Let us say that a given power supply is emitting noise in the 500MHz range, and a filter must be found and selected to ensure compliance with an applicable EMI Emissions industry standard. When exploring the market to identify possible solutions, it becomes clear that most feedthrough filters for high-current lines do not maintain maximum filtering performance to 500MHz. On the other hand, NexTek’s HPR series of feedthrough filter designs maintain relatively flat Insertion Loss performance through 1GHz. In this case, the direct filtering level comparison (xx dB down at 500MHz) demonstrates that the HPR series provides superior performance and is well-suited to this application.

Summary: NexTek HPR Series of EMI/RFI feedthrough filters incorporate some advance design techniques that are unique within the industry, allowing high filtering performance to be maintained to extremely high frequency ranges. When this high filtering performance is combined with other design factors such as their compact size, extremely rugged construction, and wide range of available Cap Values and Voltage Ratings…the HPR series of filters are leading-edge solutions.

Learn More:

Product Family Page – High Current Filters (link)

Article – High Current Filtering, Pt 1 (link to blog post)

Article – High Current Filtering, Pt 2 (link to blog post)

Resources Page (link)


Article Spotlight: Feedthrough EMI/RFI Filters For High Current Applications – Part 2

High Current Feedthrough Filter - Installation ExampleAs Part 2 of a three part series of articles covering High Current Feedthrough EMI Filters, from the basics of power filtering, factors that are unique to high current filters, all the way through to accurate feedthrough filter performance measurement.

If you have not seen Part 1 of this Series, start here:  Compact EMI Filtering for High Current Applications, Pt 1

This week’s article focuses on how to properly size and select a high current feedthrough filter, and proceed through the various calculations and analysis required to qualify a feedthrough filter for a given application.  This process includes consideration of multiple factors that are important for any high current filter application, most related to thermal issues regarding thru-current and RF Shunt [Filtering] current levels.

Topics Included C-Type Filter Comparisonin Part 2:
  • Capacitance Value vs Filter Performance
  • Thermal Issues
    • Thru-Resistance/Dissipation
    • Local Connections
    • Total Temperature Rise
  • RF Shunt Current Calculation & Limits
Click Below To Open NexTek’s “High-Current, High-Frequency Filtering With Feedthrough Caps” Article As .PDF File:

Article – High-Current, High-Frequency Filtering With Feedthrough Caps (.PDF)

Learn more about NexTek’s HPR Feedthrough Filters:

Check out NexTek’s Resources Section for additional technical articles and information

Learn more about NexTek’s Feedthrough Filter Products on the Products Page

Article Spotlight – Compact EMI Filtering for High Current Applications, Pt. 1

Would you like to know more about High Current EMI/RFI Filtering, starting with the basics of power filtering?

This week’s Content Spotlight focuses on a NexTek technical article which lays out everything you need to know when designing a high current system.  The white paper includes information about the basics of power filtering, consideration of filtering requirements, and how to make the choice between various filter types.

For more information about EMI & RFI Filtering of High Current Power Lines up to 400 Amps and beyond, NexTek is proud to highlight our “Compact Filtering for High Current & High Frequency Applications” technical article, which was originally published in Power Electronics magazine in 2009.

High Current Feedthrough Filter - Installation Example

Topics Included in Part 1:
  • Why High Current Filtering? – A quick summary of where and why high current EMI & RFI filters are used.
  • Filtering Basics – A basic overview of the equivalent circuit of a High Current Feedthrough Filter and its various sub-components.
  • Equivalent Series Resistance – “The Limiting Factor” explains how series resistance is the major factor in limiting most Capacitors’ effectiveness at high frequencies, and how NexTek’s HPR design avoids this limitation to provide filtering to 1GHz+
  • Achieving High Insertion Loss – A review of the various design options available for increasing the amount of Insertion Loss a filter provides.
  • Advances in High Current Filtering – A review of the various advanced design features integrated into the HPR High Current Filter family.
Click Below To Open NexTek’s “Compact Filtering for High Current and High Frequency Applications” Article As .PDF File:

Article – NexTek Feedthrough Filters – Compact Filtering Pt 1

Learn more about NexTek’s HPR Feedthrough Filters:

Check out NexTek’s Resources Section for additional technical articles and information

Learn more about NexTek’s Feedthrough Filter Products on the Products Page


For Part 2 of this Series, Click Here