Antenna for miniature implanted medical device

A telemetry system for transmitting signals from an implantable microdevice configured for sensing and/or affecting a parameter of a patient's body via two or more external electrodes and having a case sized and cylindrically shaped for implantation via injection into the patient's body, wherein said implantable microdevice is configured via circuitry within the housing for RF communication with one or more devices external to the microdevice, said telemetry system comprising:

• a transmit driver including a transmit driver output;
• a matching network with a first connection and a second connection, wherein said first connection of said matching network is connected to said transmit driver output;
• a tuning element;
• and
• a radiating element formed on the case of the microdevice, wherein said radiating element electrically behaves as a loop antenna, and wherein said tuning element and said radiating element are connected in a parallel circuit, wherein said parallel circuit has a first connection and a second connection, and wherein said second connection of said matching network is connected to said first connection of said parallel circuit, and wherein said second connection of said parallel circuit is connected to ground.

A telemetry system for receiving signals for an implantable microdevice configured for sensing and/or affecting a parameter of a patient's body via two or more external electrodes and having a case sized and cylindrically shaped for implantation via injection into the patient's body, wherein said implantable microdevice is configured via circuitry within the housing for RF communication with one or more devices external to the microdevice, said telemetry system comprising:

• a receiver with an input;
• a receiver amplifier with an input and an output, wherein said output of said receiver amplifier is connected to said input of said receiver;
• a matching network with a first connection and a second connection, wherein said first connection of said matching network is connected to said input of said receiver amplifier;
• a tuning element;
• a radiating element formed on the case of the microdevice, wherein said radiating element electrically behaves as a loop antenna;
• and wherein
• said tuning element and said radiating element are connected in a parallel circuit, wherein said parallel circuit has a first connection and a second connection, and wherein said second connection of said matching network is connected to said first connection of said parallel circuit, and wherein said second connection of said parallel circuit is connected to ground.

A telemetry system for transmitting signals from an implantable microdevice configured for sensing and/or affecting a parameter of a patient's body via two or more external electrodes and having a case sized and cylindrically shaped for implantation via injection into the patient's body, wherein said implantable microdevice is configured via circuitry within the housing for RF communication with one or more devices external to the microdevice, said telemetry system comprising:

• a transmit driver with an output;
• a tuning element with a first connection and a second connection, wherein said first connection of said tuning element is connected to said output of said transmit driver;
• a radiating element with a first connection and a second connection, wherein said radiating element is formed on the case of the microdevice, and wherein said radiating element electrically behaves as a loop antenna, wherein said first connection of said radiating element is connected to said second connection of said tuning element, and wherein said second connection of said radiating element is connected to ground;
• a matching network with an input and an output;
• a receiver amplifier with an input and an output, wherein said output of said matching network is connected to said input of said receiver amplifier;
• a receiver with an input, wherein said output of said receiver amplifier in connected to said input of said receiver;
• a transmit/receive switch including a first switched connection, a second switched connection, and a fixed connection;
• wherein said transmit/receive switch is switchably connected between said transmit driver and said tuning element, wherein said output of said transmit driver is connected to said first switched connection, and wherein said fixed connection is connected to said first connection of said tuning element;
• and wherein
• said input of said matching network is connected to said second switched connection of said transmit/receive switch.

A telemetry system for receiving signals for an implantable microdevice configured for sensing and/or affecting a parameter of a patient's body via two or more external electrodes and having a case sized and cylindrically shaped for implantation via injection into the patient's body, wherein said implantable microdevice is configured via circuitry within the housing for RF communication with one or more devices external to the microdevice, said telemetry system comprising:

• a matching network with an input and an output;
• a receiver amplifier with an input and an output, wherein said receiver amplifier input is connected to said output of said matching network;
• a receiver with an input, wherein said output of said receiver amplifier is connected to said input of said receiver;
• a tuning element with a first connection and a second connection, wherein said first connection of said tuning element is connected to said input of said matching network;
• a radiating element with a first connection and a second connection, wherein said radiating element is formed on the case of the microdevice, and wherein said radiating element electrically behaves as a loop antenna;
• and wherein
• said first connection of said radiating element is connected to said second connection of said tuning element, and wherein said second connection of said radiating element is connected to ground.