#$%^&*AU2017203971A120180125.pdf#####ABSTRACT Described embodiments include apparatus that includes a signal generator and an electric circuit. The signal generator is configured to supply a signal having both a first dominant 5 frequency and a second dominant frequency. The electric circuit, which includes a reactive component, is configured to generate, upon the signal being supplied to the electric circuit, a magnetic field having both the first dominant frequency and the second dominant frequency, by virtue of the 0 reactive component simultaneously resonating at both the first dominant frequency and the second dominant frequency. Other embodiments are also described.1/2 L-- co Il C L _ _ _ _ _ _ _ _0_
