title: Efficient, balanced, transmission line RF circuits by back propagation of common impedance nodes.
abstract: We present a new, efficient strategy for designing fully balanced transmission line RF circuits for solid state NMR probes based on back propagation of common impedance nodes (BPCIN). In this approach, the impedance node phenomenon is the sole means of achieving mutual RF isolation and balance in all RF channels. BPCIN is illustrated using a custom double resonance 3.2 mm MAS probe operating at 500 MHz ((1)H) and 125 MHz ((13)C). When fully optimized, the probe is capable of producing high homogeneity (810°/90° ratios of 86% and 89% for (1)H and (13)C, respectively) and high efficiency (γB1=100 kHz for (1)H and (13)C at 70 W and 180 W of RF input, respectively; up to 360 kHz for (1)H). The probe's performance is illustrated by 2D MAS correlation spectra of microcrystals of the tripeptide N-f-MLF-OH and hydrated amyloid fibrils of the protein PI3-SH3.
authors.affiliation: Francis Bitter Magnet Laboratory, Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
authors.forename: Evgeny
authors.initials: E
authors.lastname: Markhasin
authors.forename: Jianping
authors.initials: J
authors.lastname: Hu
authors.forename: Yongchao
authors.initials: Y
authors.lastname: Su
authors.forename: Judith
authors.initials: J
authors.lastname: Herzfeld
authors.forename: Robert G
authors.initials: RG
authors.lastname: Griffin
mesh_terms: D017076:Computer-Aided Design; D017097:Electric Impedance; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation*; D011846:Radio Waves; D014159:Transducers