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Enhanced Tapered Chamber Measurement Range

Engineering & Physical Sciences
Communications & Networking
Transportation & Automotive
Wireless Communications Antennas
College of Engineering (COE)
Burnside, Walter
Essman, Stephen
Theunissen, Wilhelmus (Willie)
Walton, Eric
Licensing Manager
Hong, Dongsung

T2000-026 A novel tapered chamber design that allows for easy polarization change, test zones clean of stray signals, and a thinner back wall absorber

The Need

The original tapered chamber was developed to reduce stray signals normally associated with a more traditional rectangular chamber. In a tapered chamber, a feed antenna is placed at the throat of a tapered section. This chamber design had several problems: the original concept could not satisfy boundary conditions, the wedge absorber scattered the signal, and the low frequency measurements require thick-walled chambers. A tapered chamber design that addresses these issues is needed to advance this field.

    The Technology

    Researchers at The Ohio State University, led by Dr. Walter Burnside, have developed an enhanced tapered chamber measurement concept design. The novel design includes a TEM antenna, resistive-card that solves the feed problem, and Chebyshev absorber, a wedge absorber that scatters very little when illuminated from the broadside direction. A complete prototype tapered chamber has been constructed to fully evaluate the described enhancements. The center of the cross-pol corresponds to -35dB to -40dB. The prototype functions very well.

    Commercial Applications

    • EMI/RFI shielding
    • Anechoic chambers


    • Resolves basic antenna feed problem
    • Polarization control
    • Reduced stray signals and back wall absorber volume
    • Solves the basic feed problem associated with traditional tampered chambers
    • Allows the polarization of the chamber to be easily changed from vertical to horizontal by simply rotating the feed structure, which is not possible with a rigid chamber
    • Test zone fields are clean of stray signals and the polarization is directed by the feed horn
    • Reduces the volume absorbed by the back wall absorber