| 摘要 |
Magnetic resonance includes predetermined frequency and which is connected, via a connection circuit (14), to a transmission and/or receiving device (11, 13) for RF signals, said connection circuit comprising a coaxial cable (41) having a central conductor (45) and a conductor sheath (47) which coaxially encloses the central conductor. Over at least a part of its length the coaxial cable (41) is enclosed, by a tubular conductor (49) having first and second ends (51, 53), a dielectric (50) being present between the conductor sheath (47) and the tubular conductor. The tubular conductor (49) has an electrical length equal to one quarter of the wavelength in the dielectric (50) of electromagnetic radiation of the predetermined frequency. The first end (51) of the tubular conductor (49) is directly electrically connected to the conductor sheath (47) and the second end (53) is connected to the conductor sheath via a capacitor (57). As a result, the physical length (1) of the tubular conductor (49) can be substantially shorter than its electrical length.
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