RF Applicator for in situ heating

Details RF Applicator for in situ heating RF Applicator for in situ heating

1981-11-20

1985-04-02

Pate, III, William F.

Wells

Processes

Electric current or electrical wave energy through earth for...

166 65R, E21B 4325

Patent

active

045081689

ABSTRACT:
A coaxially fed applicator for in situ RF heating of subsurface bodies with a coaxial choke structure for reducing outer conductor RF currents adjacent the radiator. The outer conductor of the coaxial transmission line supplying RF energy to the radiator terminates in a coaxial structure comprising a section of coaxial line extending toward the RF radiator from the termination for a distance approaching a quarter wavelength at the RF frequency and a coaxial stub extending back along the coaxial line outer conductor from the termination for a distance less than a quarter wavelength at said frequency. The central conductor of the coaxial transmission line is connected to an enlarged coaxial structure approximately a quarter of a wavelength long in a region beyond the end of the outer conductor coaxial choking structure.

REFERENCES:
patent: 4140179 (1979-02-01), Kasevich et al.
patent: 4196329 (1980-04-01), Rowland
patent: 4207452 (1980-06-01), Arai
patent: 4265307 (1981-05-01), Elkins

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