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Read or Download ANSI IEEE C63.5 ( [Electromagnetic Compatibility-Radiated Emission Measurements in Electromagnetic Interference -EMI- Control-Calibration of Antenas. 9 kHz to 40 GHz] [EMC] [73pages] PDF

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Additional resources for ANSI IEEE C63.5 ( [Electromagnetic Compatibility-Radiated Emission Measurements in Electromagnetic Interference -EMI- Control-Calibration of Antenas. 9 kHz to 40 GHz] [EMC] [73pages]

Example text

The magnitude of this uncertainty contribution can be reduced through the use of a calibrated precision attenuator, inserted in the direct measurement that is nearly equal to the antenna losses. 1) The contribution resulting from frequency error is dependent on the method. If a swept frequency method is used, this contribution ufSpA can be computed by multiplying the frequency span accuracy times the slope of the antenna factor over the frequency span measured. This contribution has a rectangular distribution.

3 be used to increase the statistical sample size. , transmit location C with receive location C). This method will provide a distribution of values based upon site imperfections and set up variations. The transmitting and receiving positions shall not be aligned with any welds or joints that that run the length or width of the ground plane. 6 dB 51 Copyright © 2006 IEEE. All rights reserved. 4—Example of standard deviation of five antenna calibrations at different locations; polarization = V, D = 10 m, transmit Ht = 1 m If an ambient signal obstructs the measurement signal, a reliable value can be determined from the neighboring frequency values using a straight-line interpolation with ∆f ≤ 5 MHz.

2 provides guidance on the application of these correction factors. The value of the correction factors depends on test distance, frequency, and impedance of the antenna balun. 3. 1 contains the correction factors to free space (∆AF) for a biconical dipole antenna. This table is necessary for biconical dipole antenna calibrations using the standard site method in a test setup with horizontal polarization, R=10 m, h1=2 m, and h2=1 m to 4 m. These correction factors shall be subtracted from the measured near free space antenna factor developed from the SSM.

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