This chapter discusses properties of the probes for RF magnetic field measurements and in particular, the factors limiting the measurement accuracy. Our considerations are limited to a probe consisting of a circular loop antenna loaded with a detector of a shaped frequency response. However, the majority of results are fully applicable for Hall-cell probes, magneto-optic probes, those with a magneto-diode, and for other designs, especially when considering averaging of the measured field upon the surface of the measuring antenna (probe). Many of the considerations are similar in character to those presented in Chapter 4, and some are concerned with the magnetic field measurement specificity.

Chapter Contents:

• 5.1 The Sizes of the Measuring Antenna
• 5.2 Frequency Response of the Magnetic Field Probe
• 5.3 Directional Pattern Alternations
• 5.4 Measurement Accuracy vs. Antenna Distance from Radiation Source
• 5.5 Magnetic Field Probe with a Loop Working above Its Self-Resonant Frequency
• 5.6 Comments and Conclusions

Inspec keywords: magnetic field measurement; frequency response; loop antennas; magneto-optical sensors

Other keywords: magneto-diode; Hall-cell probes; circular loop antenna; shaped frequency response; probes properties; RF magnetic field measurements; magneto-optic probes; measurement accuracy

Subjects: Magneto-optical devices; Single antennas; Magnetic variables measurement; Sensing devices and transducers