Quadrature combiner

Details Quadrature combiner Quadrature combiner

1988-05-17

1989-05-23

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

324318, 324322, 333160, G01R 3320, H01P 118, H01P 504

Patent

active

048334294

ABSTRACT:
A quadrature coil combiner for phase shifting the pulses and signals of a quadrature coil system used in magnetic resonance (MR) systems to selectively combine or cancel the pulses and signals transmitted and received. The combiner comprises a first and a second conductor for coupling a first and a second coil respectively of the quadrature coil system to a transmit-receive circuit of the MR system. The first conductor comprises an insertable .pi./2 radian delay. The second conductor includes a fixed .pi./2 radian delay. At least one of either the fixed delay or the insertable delay is a quarter wavelength cable whereby active elements are minimized.

REFERENCES:
patent: 3131367 (1964-04-01), Pitts et al.
patent: 3781722 (1973-12-01), Pierson
patent: 4682128 (1987-07-01), Sproul et al.
patent: 4684895 (1987-08-01), Misic
Chen, C. N. et al., "Quadrature Detection Coils-A Further .sqroot.2 Improvement in Sensitivity", Journal of Magnetic Resonance, vol. 54, pp. 324-327 (1983).

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