Evaluation of the Compact Antenna Range for Millimeter Wave Antenna Measurements

Authors: Joseph H. Pape
Publication: AMTA 1980
Copyright Owner: NSI-MI Technologies

The compact antenna range has been recognized as an effective means of testing microwave antennas. Antennas which normally require long outdoor ranges for testing can be tested under far field conditions at an indoor facility, using the compact range.

The compact range operates on the principal that a parabolic reflector will transform an incident spherical wave into a collimated plane wave in its near zone. The plane wave produced is suitable for testing antennas, thus simulating far field electromagnetic criteria in the near zone. The typical compact range is housed in a room approximately 20 feet wide, 40 feet long and 20 feet high.

The performance of the compact range has been well documented and specified over a frequency range of 3.95 GHz to 18.0 GHz. Now, through recent testing performed at Scientific-Atlanta, the compact range can be specified for operation up through 60.0 GHz.

This paper describes the tests that were performed, discusses the results of these tests and establishes performance specifications for operation at these millimeter frequency bands.


Spherical Near-Field Antenna Measurements with the Scientific-Atlanta Model 2022

Authors: Joseph J. Tavormina, Doren W. Hess
Publication: AMTA 1980
Copyright Owner: NSI-MI Technologies

Near-field antenna measurement techniques offer an alternative to conventional far-field antenna measurement techniques. Of the various coordinate systems used for near-field measurements, the spherical coordinate system provides the most natural extension from the conventional far-field characterization of an antenna to a more general characterization for arbitrary range lengths.

This paper describes the Scientific-Atlanta Model 2022, a user-oriented implementation of a spherical near-field antenna measurement system. An example of typical system usage is provided. System capabilities and performance are described. Key concepts required to understand and use the spherical near-field method are discussed.

The advantages and disadvantages of near-field antenna testing in relation to conventional far-field testing are considered. The particular merits of spherical near-field testing as compared to other forms of near-field testing are discussede Antenna testing situations which provide the most likely candidates for the spherical near-field measurement technique are described.



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