Rf applicator for in situ heating

H - Electricity – 05 – B

Patent

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327/21

H05B 6/10 (2006.01)

Patent

CA 1179020

2901-5820 ABSTRACT OF THE DISCLOSURE 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 en- larged coaxial structure approximately a quarter of a wavelength along in a region beyond the end of the outer conductor coaxial choking structure.

451399

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