TRANSMIT-RECEIVE SWITCHING CIRCUIT FOR NUCLEAR MAGNETIC RESONANCE DEVICE AND NUCLEAR MAGNETIC RESONANCE DEVICE

摘要

Disclosed is a transmit-receive switching circuit for an NMR device that is well suited for use in solid-state NMR probes with cooled detector coils. A transmit-receive switching circuit for an NMR device, which is used while cooled to a very low temperature to decrease thermal noise, is equipped with a first terminal to which high-power, high-frequency pulses transmitted from the power amplifier of an NMR spectrometer are input, a second terminal that transmits and outputs high-frequency pulses that have been input from the first terminal to an NMR detector via a cross diode, and to which low-power NMR signals detected by the NMR detector are received and input, and a third terminal that transmits and outputs NMR signals received and input from the second terminal to the pre-amp, wherein a shunt is disposed at each 90° shift in the high-frequency phase in the transmission line connecting the second terminal to the third terminal.