ELECTRICALLY-AND-MAGNETICALLY-COUPLED, BATTERYLESS, PORTABLE, FREQUENCY DIVIDER

摘要

A batteryless, portable, frequency divider includes a first resonant circui t that is resonant at a first frequency for receiving electromagnetic radiatio n at the first frequency: and a second resonant circuit that is resonant at a second frequency that is one-half the first frequency for transmitting electromagnetic radiation at the second frequency; and a circuit element electrically connecting the first resonant circuit to the second resonant circuit. The first resonant circuit is coupled magnetically to the second resonant circui t to transfer energy to the second resonant circuit at the first frequency in response to receipt by the first resonant circuit of electromagnetic radiation at the first frequency: and at least one of the first resonant circuit, the second resona nt circuit and the circuit element includes an active element, such as a variab le reactance element or a semiconductor switching device having gain, for causi ng the second resonant circuit to transmit electromagnetic radiation at the second frequency in response to the energy transferred from the first resonant circuit at the first frequency.