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An implantable medical device includes a housing. An opening is present in the housing. The implantable medical device includes an antenna in the housing, where the antenna is located below the opening. The implantable medical device includes a cover coupled to edges of the housing defining the open

An implantable medical device includes a housing. An opening is present in the housing. The implantable medical device includes an antenna in the housing, where the antenna is located below the opening. The implantable medical device includes a cover coupled to edges of the housing defining the opening to close the opening. The cover enables passage of radio frequency signals at one or more communication frequencies to and from the antenna. The implantable medical device also includes an antenna shield positioned above the cover. The antenna shield reduces passage of radio frequency signals to and from at least a portion of the antenna during use.

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1. An implantable medical device comprising: a housing, wherein an opening is present in the housing;an antenna in the housing, wherein the antenna is located below the opening;a cover coupled to edges of the housing defining the opening to close the opening, wherein the cover enables passage of rad

1. An implantable medical device comprising: a housing, wherein an opening is present in the housing;an antenna in the housing, wherein the antenna is located below the opening;a cover coupled to edges of the housing defining the opening to close the opening, wherein the cover enables passage of radio frequency signals at one or more communication frequencies to and from the antenna; andan antenna shield positioned above the cover, wherein the antenna shield reduces passage of radio frequency signals to and from at least a portion of the antenna during use. 2. The implantable medical device of claim 1, further comprising a header coupled to the housing, wherein the cover is covered by the header. 3. The implantable medical device of claim 2, wherein the antenna shield is positioned in the header. 4. The implantable medical device of claim 2, wherein the antenna shield is coupled to the header. 5. The implantable medical device of claim 1, wherein the antenna shield is coupled to the cover. 6. The implantable medical device of claim 1, wherein the antenna shield includes at least one unshielded portion. 7. The implantable medical device of claim 1, wherein at least one radiating/receiving element of the antenna is located directly below the cover. 8. The implantable medical device of claim 1, wherein the antenna shield attenuates signals at frequencies lower than the one or more communication frequencies to a greater extent than the antenna shield attenuates signals at the one or more communication frequencies. 9. An implantable medical device comprising: a housing, wherein an opening is present in the housing;an antenna in the housing, wherein the antenna is located below the opening; anda cover coupled to the housing to close the opening, the cover including an antenna shield coupled to the cover, the antenna shield configured to provide radio frequency shielding to the antenna during use. 10. The implantable medical device of claim 9, wherein the antenna shield includes a conductive layer deposited on a top surface of the cover. 11. The implantable medical device of claim 10, wherein the antenna shield comprises one or more openings in the conductive layer. 12. The implantable medical device of claim 11, wherein at least one opening of the one or more openings is positioned directly above one or more radiating/receiving elements of the antenna. 13. The implantable medical device of claim 9, wherein the antenna comprises a planar antenna with one or more slots, and wherein conductive portions of the antenna shield are located directly above more than half of an area of a non-conductive portion of the antenna defined by the one or more slots. 14. The implantable medical device of claim 9, wherein the antenna shield attenuates signals at frequencies lower than one or more communication frequencies to a greater extent than the antenna shield attenuates signals at the one or more communication frequencies. 15. An implantable medical device comprising: a housing, wherein an opening is present in a first portion of the housing;an antenna in the housing;a cover coupled to the first portion to seal the opening, wherein the cover enables passage of radio frequency signals at one or more communication frequencies to and from the antenna;a header coupled to the housing over at least a portion of the cover; andan antenna shield positioned in the header, wherein the antenna shield reduces passage of radio frequency signals to and from at least a portion of the antenna during use. 16. The implantable medical device of claim 15, wherein the antenna shield comprises one or more unshielded portions. 17. The implantable medical device of claim 15, wherein the cover comprises a ceramic sheet. 18. The implantable medical device of claim 15, wherein the antenna comprises a planar antenna including one or more conductive layers and one or more non-conductive layers defined by one or more openings in the one or more conductive layers, and wherein the antenna shield extends over more than half of an area defined by the one or more openings. 19. The implantable medical device of claim 15, wherein at least a portion of one or more radiating/receiving elements of the antenna is located directly below the antenna shield. 20. The implantable medical device of claim 15, wherein the antenna shield attenuates signals at frequencies lower than the one or more communication frequencies to a greater extent than the antenna shield attenuates signals at the one or more communication frequencies.