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A 100-1000 MHz field strength standard for an anechoic chamber

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1 Author(s)
Matsui, T. ; Electrotech. Lab., Ibaraki, Japan

A 100-1000 MHz range field strength standard using a short broadband dipole antenna has been developed for use in an anechoic chamber. The broad bandwidth of the standard antenna reduces calibration time and reduces the calibration differences which occur when the standard antennas must be changed for broadband calibration. The enclosure of the system in the anechoic chamber eliminates the interaction of the radiation with the neighboring environment, and ensures that the measurements are unaffected by weather. Error, due to reflection waves from each of the walls, the floor, and the ceiling of the chamber, was reduced by measuring the insertion loss with very closely spaced antennas, and by compensating the near-field effect theoretically. This frequency range is covered by only two standard antennas, and the field strength standard has been established with one-sigma uncertainty within ±1.6%

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Instrumentation and Measurement, IEEE Transactions on  (Volume:40 ,  Issue: 4 )