designed an implanted circular coil with dimensions of [d.sub.out] = 18 mm and [d.sub.in] = 16 mm to offer 15 mm of distance coupling with an operating frequency of 742 kHz.
In order to design effective inductive coupling links based on circular spiral coils acting as a transmitter and receiver, the mutual inductance between the coils and the self-inductance of a spiral circular coil with turns should be introduced.
In this example we calculated the restoring (radial) magnetic force [F.sub.R] and the propulsive (axial) magnetic force [F.sub.Z] between the primary circular coil
[R.sub.P] = 42.5 mm and the secondary circular coil
[R.sub.S] = 20 mm with the axial displacement d = 3 mm in the function of the distance between planes c .
The coils were not usually one continuous band as they were in Mimbres pots, but each layer was a separate, complete loop with another distinct circular coil
placed on top.
The transmitting and receiving inductors have [N.sub.1] and [N.sub.2] turns of coaxial planar circular coils
with rectangular cross-sections, respectively, which are located in planarly layered media.
Chen, "Magnetic force calculation between circular coils
of rectangular cross section with parallel axes for superconducting magnet," Progress In Electromagnetics Research B, Vol.
The precession is resonantly driven by a weak radio-frequency (rf) field (of amplitude [B.sub.I] and frequency [[omega].sub.rf]) applied with a pair of circular coils
surrounding the cell.
The sensor array contains a pair of circular coils
with the same size which are used as excitation coil and receiving coil respectively.