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A system for enabling telemetry in implantable medical devices is provided. An implantable medical device has device having radio-frequency telemetry capabilities. The device includes a housing and electronic circuitry contained within the housing. The device also includes an array of antennas conne

A system for enabling telemetry in implantable medical devices is provided. An implantable medical device has device having radio-frequency telemetry capabilities. The device includes a housing and electronic circuitry contained within the housing. The device also includes an array of antennas connected to the electronic circuitry. According to various embodiments, the array and circuitry are adapted to facilitate far-field transmission and reception of modulated radio-frequency energy at one or more specified carrier frequencies. Individual antenna elements in the array are connected simultaneously or in a mutually exclusive manner to electronic circuitry, according to various embodiments. Individual antenna element geometries are sized to optimize individual antennas each for a different range of operating frequencies, according to various embodiments. Other aspects and embodiments are provided herein.

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What is claimed is: 1. An implantable medical device, comprising: a housing; electronic circuitry within the housing; and an array of antennas connected to the electronic circuitry, wherein the array and circuitry are adapted to facilitate transmission and reception of modulated radio-frequency ene

What is claimed is: 1. An implantable medical device, comprising: a housing; electronic circuitry within the housing; and an array of antennas connected to the electronic circuitry, wherein the array and circuitry are adapted to facilitate transmission and reception of modulated radio-frequency energy at one or more specified carrier frequencies; wherein individual antenna elements in the array are connected in a mutually exclusive manner to electronic circuitry having a single transmit/receive antenna port using a switch; and wherein a state of the switch is changed to (1) minimize an observed error rate, or (2) to restore communication upon loss of radio frequency communication. 2. The device of claim 1, wherein the array includes two or more different antenna element geometries. 3. The device of claim 2, wherein individual antenna element geometries are sized to optimize individual antennas in the array each for a different termination medium. 4. The device of claim 3, wherein a termination medium includes air. 5. The device of claim 3, wherein a termination medium includes muscle tissue. 6. The device of claim 3, wherein a termination medium includes fatty tissue. 7. The device of claim 2, wherein individual antenna element geometries are sized to optimize individual antennas each for a different range of operating frequencies. 8. The device of claim 1, wherein each antenna in the array of antennas includes identical antenna element geometries. 9. The device of claim 1, wherein the array includes a photochemically-etched metallization pattern on a planar dielectric substrate. 10. The device of claim 1, wherein the switch includes a mechanical switch. 11. The device of claim 1, wherein the switch includes an electrical switch. 12. The device of claim 1, wherein a state of the switch is changed to minimize an observed error rate. 13. The device of claim 1, wherein a state of the switch is changed to restore communication upon loss of radio frequency communication. 14. An implantable medical device, comprising: a housing; electronic circuitry within the housing; and an array of antennas connected to the electronic circuitry, wherein the array and circuitry are adapted to facilitate transmission and reception of modulated radio-frequency energy at one or more specified carrier frequencies; and wherein individual antenna elements in the array are each connected to electronic circuitry having a single transmit/receive antenna port via inline phase shifting elements, such that each antenna element transmits/receives a proportion of radio-frequency energy to the electronic circuitry with a phase shift. 15. The device of claim 14, wherein the phase shift for each antenna element in the array is fixed to establish a desired shape of a transmit/receive spatial pattern. 16. The device of claim 14, wherein the phase shift for each antenna element in the array is variable and controlled by logic to dynamically alter a shape of a transmit/receive spatial pattern. 17. The device of claim 16, wherein the logic alters relative phase shift of each antenna element according to a fixed sequence of phases. 18. The device of claim 16, wherein the logic alters relative phase shift of each antenna element to minimize an observed error rate. 19. The device of claim 16, wherein the logic alters relative phase shift of at least one antenna element to restore communication upon loss of radio frequency communication. 20. The device of claim 14, wherein the array includes a photochemically-etched metallization pattern on a planar dielectric substrate. 21. An implantable medical device, comprising: a housing; electronic circuitry within the housing; and an array of antennas connected to the electronic circuitry, wherein the array and circuitry are adapted to facilitate transmission and reception of modulated radio-frequency energy at one or more specified carrier frequencies; wherein individual antenna elements in the array are each connected to electronic circuitry having multiple transmit/receive antenna ports, such that each antenna element is capable of operating independently; and wherein each antenna element in the array is at least one of (1) phase-shifted by logic according to a fixed sequence of states, (2) switched by logic to minimize an observed error rate, or (3) phase-shifted by logic to minimize an observed error rate, or wherein at least one antenna element in the array is switched by logic to restore communication upon loss of radio frequency communication. 22. The device of claim 21, wherein each antenna element in the array is switched by logic according to a fixed sequence of states. 23. The device of claim 21, wherein each antenna element in the array is phase-shifted by logic according to a fixed sequence of states. 24. The device of claim 21, wherein each antenna element in the array is switched by logic to minimize an observed error rate. 25. The device of claim 21, wherein each antenna element in the array is phase-shifted by logic to minimize an observed error rate. 26. The device of claim 21, wherein at least one antenna element in the array is switched by logic to restore communication upon loss of radio frequency communication. 27. The device of claim 21, wherein the array includes a photochemically-etched metallization pattern on a planar dielectric substrate.