Arrangement for operating a symmetrical radio-frequency antenna

Details Arrangement for operating a symmetrical radio-frequency antenna Arrangement for operating a symmetrical radio-frequency antenna

1989-03-29

1990-05-01

Williams, Hezron E.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01R 3320

Patent

active

049222040

ABSTRACT:
For operating the radio-frequency antenna of a nuclear magnetic resonance tomography apparatus, the antenna being connected to an asymmetrical line, a sheath wave trap is provided between the antenna and the line, with the inductor of the sheath wave trap being a toroid. A low-scatter sheath wave trap is obtained in this manner, particularly suitable for circularly polarized resonators. The trap suppresses difference currents caused by asymmetries, and thus simultaneously functions as a balanced-to-unbalanced transformer (balun).

REFERENCES:
patent: 3961331 (1976-06-01), Campbell
patent: 4028704 (1977-06-01), Blass
patent: 4031540 (1977-06-01), Borys, Jr.
patent: 4173742 (1979-11-01), Lehmann
patent: 4578664 (1986-03-01), Kinzler et al.
patent: 4620155 (1986-10-01), Edelstein
patent: 4631504 (1986-12-01), Matsuda et al.
patent: 4682125 (1987-07-01), Harrison et al.
patent: 4818957 (1989-04-01), Cort
"Coax-Speisung Symmetrischer Antennen," Auerbach, DL-QTC, No. 4, 1961, pp. 156-158.

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