one of the spiral conductors e g the conductor of spiral 14 for the purpose of further explanation it is assumed that the parameters of the coupled spirals parameters can be characterized by the spiral conductor length l and its pitch h in the absence of targets 6 and 19 formula d becomes here and further it is taken into account that resonators 1 and 2 are formed by spirals with a half circle configuration i e their equivalent capacitance and inductance are one half that of a full circle spiral equivalent inductances l 1 and l 2 of coupled spirals when placed at a small distance a from one another exceed the inductance of one spiral in free space by approximately four times l 1 u2248 l 2 u2248 u03bc 0 u2062 u03c0 u2062 u2062 r 2 wh u2062 u2062 u03c4 u03bc 0 u2062 2 u2062 l w u2062 u2062 u03c4 f where u03c4 is the transverse constant approximately proportional to deceleration n u03bb is the wavelength in free space and deceleration n is defined as the ratio of light velocity to the phase velocity of the wave in resonators 1 and 2 when targets 6 and 19 are placed at a distance d from the plane of resonator 1 or resonator 2 and are aligned with the resonator inductances decrease approximately in proportion to distance d.