Arrangement for tuning a balanced-to-ground resonator

Details Arrangement for tuning a balanced-to-ground resonator Arrangement for tuning a balanced-to-ground resonator

1989-03-29

1990-05-15

Gensler, Paul

Tuners

Variable capacitor tuned

Rectilinearly sliding plates

334 82, 334 83, 361299, H03J 320

Patent

active

049261479

ABSTRACT:
An apparatus for tuning a balanced-to-ground resonator, the resonator including at least one radio-frequency coil, the radio-frequency coil having an inductance forming a resonant circuit in combination with a capacitor, includes two identical differential capacitors which are mechanically coupled so that their respectively capacitances, during tuning, change in a balanced-to-ground fashion. In this tuning arrangement, the dependency of the frequency error on a change of the load of the resonator is negligibly small, so that a separate step or separate circuitry for undertaking frequency correction is not needed.

REFERENCES:
patent: 1866456 (1932-07-01), Fichandler
patent: 1987124 (1935-01-01), Muller
patent: 2028596 (1936-01-01), Franklin et al.
patent: 2075957 (1937-04-01), Payne
patent: 2400897 (1946-05-01), Wachtman
"Butterfly Oscillators as Detectors of Nuclear Quadrupole Resonance Signals," Butcher et al., J. Phys. E., Si. Instrum., vol. 12, No. 6, pp. 484-489 (1979).
"An Improved Saddle Coil for MR Imaging in Resistive Magnet System," Boornbos et al., Magnetic Resonance in Medicine, vol. 2, pp. 490-494 (1985).

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