๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Piezoelectric-controlled tuning capacitor for surface coils

โœ Scribed by James S. Hyde; Robert J. Rilling; A. Jesmanowicz; J. Bruce Kneeland

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
353 KB
Volume
12
Category
Article
ISSN
0740-3194

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โœฆ Synopsis

The design of a piezoelectric-controlled trimmer capacitor and its use as a tuning element of an MRI surface coil at 63.8 MHz are described. It is found that image quality does not depend strongly on match of the coil to the transmission line but that tuning can be a significant factor. The work is intended to lead eventually to an automatic frequency control circuit in which the capacitor serves as the active element in holding the resonant frequency of the nuclei and the resonant frequency of the coil in coincidence.

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Automatic Coupling Control of a Loopโ€“Gap
Automatic Coupling Control of a Loopโ€“Gap Resonator by a Variable Capacitor Attached Coupling Coil for EPR Measurements at 650 MHz
โœ Hidekastu Yokoyama; Toshiyuki Sato; Tateaki Ogata; Hiroaki Ohya; Hitoshi Kamada ๐Ÿ“‚ Article ๐Ÿ“… 2001 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 220 KB

A coupling coil was fabricated that can electrically change the magnetic coupling with a loop-gap resonator (LGR) for EPR studies at 650 MHz. It is composed of a single-turn coil and a coupling control circuit that includes a varactor diode. The coarse control of the magnetic coupling is made by mec