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An article in the October 2005 edition of Evaluation Engineering entitled, "The World of the Near Field" presented formulas for three regions of the near-field that relate the largest physical dimension of the radiator to the operational wavelength. Since there tends to be a lot of opinions (rules of thumb) about where the transition regions exist. I figured it would be a good idea to provide a definitive treatment of it.

A simple calculator is provided that uses the formulas given below.


 

Variables can only be entered into colored cells. Office Web Components (OWC) are required for this page to function.

Some familiar frequencies to check out: AM = 530-1710 kHz GPS = 1575.42 MHz PCS = 1850-1990 MHz FM = 88-108 MHz 802.11b/g = 2.40-2.48 MHz DBS = 12.8-14.5 MHz ISM = 902-928 MHz 802.11a = 5.15-5.82 MHz RFID = 13.56 MHz

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