Single antenna dual frequency transponder

Details Single antenna dual frequency transponder Single antenna dual frequency transponder

1990-10-25

1993-04-27

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

343876, 455 82, 455 83, 34082572, H04B 159, H04B 144

Patent

active

052066398

ABSTRACT:
A single antenna, dual frequency transponder is provided. The transponder includes the antenna, first and second capacitors, a microprocessor/coder for generating a first and second control signals, and a logic circuit which uses the two control signals as inputs and depending on the state of the second control signal either provides an open circuit or a frequency signal at its output node. When the second control signal is a dormant (inhibit) signal, an open circuit is provided. As a result, the capacitors and the antenna provide a first tuned LC circuit which will receive an incoming signal at a desired first frequency. The incoming signal thereby resonates the LC circuit which provides a wake-up signal to the microprocessor/coder. In turn, the microprocessor/coder generates the first control signal of a desired second frequency. In turn, the logic circuit provides a related signal of the same second frequency as an output. With such an output, one of the two capacitors is effectively eliminated from the circuit, and the remaining capacitor and the antenna constitute a second tuned LC circuit which is tuned to the second frequency. By providing adjustable capacitance capacitors, the circuit is adjustable to desired incoming and outgoing frequencies.

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