Patent ID: 6933725

Claim:
A nuclear magnetic resonance probe circuit comprising: a first resonator resonant at a frequency f 1 ; a second resonator having a magnetic field generating component and being resonant at a frequency f 2 that is higher than f 1 ; and a third resonator resonant at a frequency f 3 that is higher than f 2 , wherein the resonances of the first, second and third resonators interact to produce two intermediate resonances, respectively, at a frequency f 12 between frequency f 1 and f 2 , and a frequency f 23 between frequency f 2 and f 3 such that, when signals at f 12 and f 23 are coupled into the circuit, the circuit resonates at f 12 and f 23 and magnetic fields are generated by the magnetic field generating element at frequency f 12 and frequency f 23 .