Diode-based transmitter and receiver detuning circuits

A passive transmitter detuning circuit comprising:

• a first plurality of diodes connected in series between a transmitter antenna and a first circuit terminal, each diode of the first plurality of diodes being connected with a first orientation;
• a corresponding second plurality of diodes connected in series between the transmitter antenna and the first circuit terminal, each diode of the second plurality of diodes being connected with a second orientation opposite to the first orientation, the second plurality of diodes being connected in parallel with the first plurality of diodes;
• a corresponding plurality of resistors connected in in series between the transmitter antenna and the first circuit terminal, each resistor of the plurality of resistors being connected in parallel with a respective one of the first plurality of diodes and a respective one of the second plurality of diodes;
• and
• a capacitor connected in parallel with the transmitter antenna between the first circuit terminal and a second circuit terminal.

A diode-based receiver detuning circuit comprising:

• a first circuit branch connected in parallel with a receiver antenna between a first circuit terminal and a second circuit terminal, the first circuit branch including a first diode and a second diode connected in series with the first diode, the first and second diodes having opposite connection orientations, the first circuit branch further including a first current-limiting resistor connected between the first diode and a first junction node positioned between the first and second diodes, and a second current-limiting resistor connected between the second diode and the first junction node;
• a second circuit branch connected in parallel with the first circuit branch between the first and second circuit terminals, the second circuit branch including a third diode and a fourth diode connected in series with the third diode, the third and fourth diodes having opposite connection orientations, the second circuit branch further including a third current-limiting resistor connected between the third diode and a second junction node positioned between the third and fourth diodes, and a fourth current-limiting resistor connected between the fourth diode and the second junction node;
• a command input line connected between the first and second junction nodes, the command input line including a power source and a switch configured to selectively connect the power source to one of the first and second junction nodes;
• and
• a first capacitor connected in parallel with the first and second circuit branches between the first and second circuit terminals.

A receiver sub-system comprising:

• a transformer;
• a receiver antenna connected to the transformer;
• and
• a diode-based receiver detuning circuit including:
• a pair of diodes connected in series with one another to the transformer and with opposite connection orientations to one another;
• a command input line connected between a center tap of the transformer and a junction node positioned between first and second diodes of the pair of diodes, the command input line including a power source and a switch operable to connect the power source to one of the junction node and the center tap of the transformer;
• a first resistor connected in series between the first diode and the junction node;
• and
• a second resistor connected in series between the junction node and the second diode.