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An RF coil assembly for an NMR instrument includes a cylindrical shield disposed concentrically about a central axis and a set of linear conductors disposed concentrically about the central axis and radially inward from the shield. Assembly further includes an annular member positioned to span the g

An RF coil assembly for an NMR instrument includes a cylindrical shield disposed concentrically about a central axis and a set of linear conductors disposed concentrically about the central axis and radially inward from the shield. Assembly further includes an annular member positioned to span the gap between the shield and linear conductors. The annular member includes an insulating substrate, a conductive layer over the substrate, and a series of non-conducting gaps through the conductive layer. One or more lumped element capacitors are connected across one or more of the gaps to tune to resonance.

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[ What is claimed is:] [1.]1. An RF coil assembly for an NMR instrument which comprises:a) a cylindrical shield disposed concentrically about a central axis and defining a cylindrical cavity into which a subject to be examined is subjected to an RF field;b) a set of linear conductors which are dispo

[ What is claimed is:] [1.]1. An RF coil assembly for an NMR instrument which comprises:a) a cylindrical shield disposed concentrically about a central axis and defining a cylindrical cavity into which a subject to be examined is subjected to an RF field;b) a set of linear conductors which are disposed concentrically about the central axis and radially inward from the shield, each linear conductor being oriented in substantially the same direction as the central axis;c) an annular member connected to one end of the cylindrical shield and extending radially inward therefrom to provide support for one end of each of the linear conductors, said annular member providing electrical connection between the cylindrical shield and a set of circuitry sites associated with one end of the respective linear conductors, each circuitry site defining an insulating gap;d) a lumped element capacitor connected across at least one of the gaps;e) an end cap connected to the other end of the cylindrical shield and extending radially inward therefrom to provide support for the other end of the linear conductors and to provide an RF mirror which limits signal leakage through the other end of the cylindrical shield, said end cap providing electrical connection between the cylindrical shield and a set of circuitry sites associated with the other end of the respective linear conductors, each circuitry site defining an insulating gap; andf) a lumped element capacitor connected across at least one of the gaps formed on the end cap.