High frequency Helmholtz coils are constructed by two coils. These Helmholtz coils are often used for cancel background (earth’s) magnetic field, measurements and calibration, and magnetic field for susceptibility testing of electronic equipment. When electrical current pass through the high frequency Helmholtz coils in the same direction, it creates a highly uniform magnetic field in a 3-dimension volume of space inside the coils. Helmholtz coils, named after the German physicist Hermann von Helmholtz, is consisted of two identical electromagnetic coils place in parallel and aligned their centers in the same axis like a mirror image as shown in Figure 1. Figure 1: One-axis high frequency Helmholtz coils is consisted a pair of coils with radius R and separated by a distance equal to R.
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