Importance

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Abstract

A magnetic resonance apparatus includes an RF coil tuned to a predetermined frequency and which is connected, via a connection circuit, to a transmission and/or receiving device for RF signals. A connection circuit is provided in order to increase the bandwidth of the RF coil without imposing restrictions on the design and the construction of the coil. Therefore, viewed from the RF, the connection circuit successively includes the following elements: a first matching network which is operative to transform an impedance connected to its output to a substantially lower value; a circuit which has the properties of a transmission line whose effective length is substantially equal to an integer number of times one half wavelength at the frequency to which the RF coil is tuned and whose characteristic impedance is substantially equal to the input impedance of the first matching network; and a second matching network which is operative to transform an impedance connected to its output to a substantially higher value.

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First Claim