Antenna Products



NSI-MI Technologies’ Commercial Radome Systems are intended for after-repair testing of commercial aircraft radomes. The systems are capable of making measurements described in the widely referenced document DO-213. After repair, radome testing is usually, but not always, limited to transmission efficiency. Sidelobe Level (SLL) measurements are also available if the radomes are being tested in a Quality Assurance / Production test environment. Test systems are available in both C band (5.3 GHz to 5.74 GHz) and X band (9.3 GHz to 9.5 GHz) frequency ranges.

  • Features

    NSI-MI Technologies offers a complete line of products for testing commercial radomes. Our solutions can be configured to provide an RTCA/DO-213 compliant electromagnetic test facility to test for the requirements contained in Section 2.2 of the standard. A turn-key test system or individual product solution can be provided to help the user develop a test plan.

    • Highly accurate and repeatable results
    • Easy to use and maintain
    • Low cost
    • Scalable system allows for future expansion
    • System software generates automatic test results
    • Test system supports all current radome sizes
    • Most affordable system on the market today
    • Guaranteed test results that meet or exceed RTCA/DO-213


    • Complete assurance of fidelity and accuracy of requirements
    • NSI-MI Technologies is a partner who can help customers through the entire process over the radome test system life cycle
    • Most affordable system on the market today
    • Guaranteed test results that meet or exceed RTCA/DO-213

    RF Stability

    • DO-213 requires system level repeatability of +/-2% power or less than +/- 0.08dB throughout the span of the radome test.

    Key Features that enhance RF fidelity

    • No moving cables in our system
    • Highly repeatable rotary joints in the two antenna axes (no other moving RF parts)
    • Antenna alignment does not depend on radomepositioner accuracy or dynamics
    • System antenna and range are precisely and permanently aligned
    • Built-in compensation for drift in source, cables, and amplifier



Leverage NSI-MI Technologies’ years of experience in the antenna and radome test business. These test and measurement facilities are located in our United States headquarters near Atlanta, Georgia. We have dedicated radome testing equipment and instrumentation that can be applied to a wide range of requirements, from basic DO-213 testing to custom military requirements that push the limits of today’s measurement techniques.

NSI-MI’s has recently tested radomes of many sizes and requirements such as C-130 and F-15 radomes. Our insistence on measurement integrity and culture of close customer interaction ensures that quality and safety is maintained throughout the program.

  • Features

    • Cross-industry expertise from DO-213 to full military requirements
    • Includes all the necessary test facilities, test equipment and test personnel
    • State-of-the-art ranges at our Atlanta test facilities
    • Quality equipment, expert staff and flexibility


    NSI-MI’s in-house compact range facility with a 6ft cylindrical quiet zone includes a full suite of RF and microwave instrumentation and data analysis tools with dedicated radome positioning equipment. This allows us to accommodate a wide variety of radome sizes and provide rapid performance testing up to 94 GHz, all in an environmentally consistent and secure indoor facility.

    In-House Features

    Size: 24 ft wide x 40 ft deep x 25 ft tall with adjacent control room
    Frequency Range: 2 to 94 GHz
    Data Acquisition: Fully-automated system for all range configurations, controlled by an MI-3000 Data Acquisition and Analysis Workstation
    Compact Range
    Amplitude Variation: 0.5 dB amplitude taper
    Phase Variation: Less than 10 degrees
    Test Zone: Cylindrical 4 ft (1.2 m) diameter x 4 ft (1.2 m) length - Expandable to 6 ft (1.8 m) x 5 ft (1.5 m), 1.0 dB amplitude taper
    Positioning Equipment
    Equipment: Configurable radome ring and antenna positioner. Many alternative positioning components and fixtures available.
    Maximum Test Loads: Up to 1000 lbs

    Typical Measurements

    Transmission Efficiency

    Transmission Efficiency is the percentage of microwave energy that passes through a radome, typically measured over various angular regions (which usually represent the area of the radome actually used by the radar system). It is measured by comparing power levels received by a test antenna under two different conditions. A reference measurement is made with the radome off, then again after installation of the radome over the radar antenna. The resulting data is plotted over the surface of the radome. While ideally transparent, all radomes will have losses as the RF signal passes through it due to a combination of reflections, diffraction, absorption, refraction and depolarization.

    Beam Deflection (BD) / Boresight Shift (BS)

    Beam Deflection is the change in the direction of propagation of the microwave signal as it passes through the radome. If one considers the geometry associated with the tracking of a fast moving enemy target or terrain avoidance for a low flying, fast moving aircraft, even very small angular errors introduced by the radome can have significant effects. (For test antennas with a tracking null, the term “boresight shift” is often used interchangeably with Beam Deflection. Beam Deflection can then be a term reserved for the case of a sum beam.)


    Reflectivity is the change in the magnitude of the reflection coefficient at the port of the radar antenna which is caused by the presence of the radome. This is measured using a reflectometer with a remote head. The reflection coefficient is measured before and after the radome is installed, with the antenna pointing out into a reflection-less environment (such as an anechoic chamber or an outdoor range). Ideally, this measurement is independent of pointing direction of the radar antenna.

    Antenna Pattern Distortion

    Pattern distortion is the change to the radar antenna radiation pattern caused by the presence of the protective radome. Patterns are taken with and without the radome present. Various analyses can be made to assess the changes to the pattern shape, including: beam width, side lobe levels, peak/ null location, lobe imbalance, null fill, etc. This requires that the radar antenna rotate with the radome to maintain a particular antenna to radome aspect as the antenna pattern is measured.



    Typical Measurements

    Instrumentation is calibrated to NIST standards, providing confidence in the accuracy of tests performed at our facility. Periodically, we conduct a range probe using a phase/amplitude probe system to ensure electromagnetic quality in the frequency bands specified.


1125 Satellite Blvd., Suite 100
Suwanee, GA 30024-4629 USA

+1 678 475 8300
+1 678 542 2601

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19730 Magellan Drive
Torrance, CA 90502-1104 USA

+1 310 525 7000
+1 310 525 7100


Unit 51 Harley Road
Sheffield, S11 9SE UK

+44 7493 235224

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