04373581 is referenced by 60 patents and cites 10 patents.

The disclosure relates to a technique for radio frequency heating of hydrocarbonaceous earth formations in which a high power radio frequency transmitter is impedance matched to a transmission line including a plurality of conductors at least partially embedded in the formation to be heated. The impedance matching may be effected by a "T" network having three variable reactances. In accordance with the teachings of the present invention, continuous variations of impedance, of the type encountered during the heating of the formation, may be matched in unambiguously defined Smith chart regions by varying two of the three reactances to minimize reflected power from the transmission line.

Title
Apparatus and method for radio frequency heating of hydrocarbonaceous earth formations including an impedance matching technique
Application Number
6/226308
Publication Number
4373581
Application Date
January 19, 1981
Publication Date
February 15, 1983
Inventor
Robert L Toellner
Duncan
OK, US
Agent
William J Beard
Assignee
Halliburton Company
OK, US
IPC
E21B 43/12
E21B 47/00
E21B 43/24
View Original Source