Design of Broadband T/R Switch for Magnetic Resonance

doi:10.11938/cjmr20212895

Abstract

Abstract:

Transmit/receive (T/R) switch is used to switch the transmission and reception channels in nuclear magnetic resonance (NMR) spectrometer, which is required high isolation of high-power signals and low insertion loss of NMR signals. In addition, the general narrowband T/R switch is no longer applicable in broadband magnetic resonance spectrometer. This paper presents a positive-intrinsic-negative (PIN) diode-based T/R switch design with low insertion loss (less than 1 dB), high isolation of high-power signals (more than 75 dB) and short switching time (1 μs) in broadband (10~100 MHz). Substituting the broadband T/R switch for the narrowband T/R switch of the general probe, the NMR signals of hydrogen and fluorine nuclei at two different frequencies were measured on a 0.5 T NMR spectrometer, which verified the broadband performance of the T/R switch.

Key words: magnetic resonance, radio frequency front-end, transmit/receive (T/R) switch, broadband

CLC Number:

O482.53

Shou-quan YAO,Jun-cheng XU,Ming SHEN,Bing-wen HU,Yi-qiao SONG,Yu JIANG. Design of Broadband T/R Switch for Magnetic Resonance[J]. Chinese Journal of Magnetic Resonance, 2022, 39(1): 115-122.

Figures/Tables 6

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