Technique for driving quadrature dual frequency RF resonators fo

Details Technique for driving quadrature dual frequency RF resonators fo Technique for driving quadrature dual frequency RF resonators fo

1993-02-18

1994-11-15

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01V 300

Patent

active

053651731

ABSTRACT:
In a magnetic resonance system, four primary loop circuits (50, 52, 54, 56) are inductively coupled to a resonator coil (32) at 90.degree. intervals around its circumference. The loop circuits are over-coupled to the resonator coil, i.e. they present more than the characteristic resistance of the associated cabling system which causes the maximum current transfer between the loop circuits and the resonator coil to be offset (f.sub.N) in equal amounts in each direction from a natural resonance frequency (f.sub.0) of the resonator coil. In one embodiment, two adjacent primary loop circuits provide for quadrature radio frequency transmission to and from the resonator coil at a first frequency and the other two primary loop circuits provide for quadrature radio frequency transmission to and from the resonator coil at a second resonance frequency. Each of the primary loop circuits includes a tank circuit (62) for blocking the passage of the frequency of the other quadrature primary loop circuit pair. In another embodiment, the third and fourth primary loop circuits are connected with tuning capacitors for adjusting the resonance frequency of the resonator coil relative to radio frequency signals applied and received by the primary loop circuit 180.degree. opposite. This enables the frequency of each quadrature component of a quadrature RF signal to be adjusted separately. Analogously, this enables the resonance frequency of two linear RF signals to be adjusted independently.

REFERENCES:
patent: 4638253 (1987-01-01), Jaskolski et al.
patent: 4939465 (1990-07-01), Biehl et al.
patent: 5003265 (1991-03-01), Leussler
patent: 5216368 (1993-06-01), Leussler

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