The design of a uniaxial electromagnetic field sensor for measuring the antenna far field within its region of higher signal strength is described. The sensor is autonomous; i.e., it is powered by the measured field; therefore, no external power supply is necessary. After accumulating a sufficient amount of energy, the sensor runs a single measurement and sends the result through an optic fiber, or the result can be stored in nonvolatile memory. The sensor does not require any metallic cable for delivering energy; therefore, the measured field distribution is not influenced by it and the data transfer from the sensor is also not influenced by any induced noise voltage.
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