The tube can be solid or perforated, and circular, oval, square, rectangular, or asymmetrical in cross section. Two or more tubes may be joined together to form a resonant device. The resonance frequency, n , of a STS is given by the equation where L is the inductance of the tube and C the capacitance created either by the gap in the tube or by capacitors spanning the gap.
Power is coupled into and out of the resonant circuit by a coupling loop.
The impedance of the resonant circuit can be adjusted by varying the distance between the loop and the inductor. Therefore, a coupling capacitor is not needed in the circuit. All Rights Reserved.