Patent ID: 11901159
Assignee: HITACHI KOKUSAI ELECTRIC INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC C  H

Claim 7:
8. The RF generator device of claim 5, further comprising:
a second RF generator device connected to a third antenna and a fourth antenna disposed in the chamber,
wherein the second RF generator device includes:
a third RF generator configured to supply RF power having a third frequency to the third antenna;
a fourth RF generator configured to supply RF power having a fourth frequency to the fourth antenna;
a third RF controller configured to control the third RF generator; and
a fourth RF controller configured to control the fourth RF generator,
wherein the third RF controller includes:
a third fast Fourier transformer; and
a third filter,
wherein the fourth RF controller includes: a fourth fast Fourier transformer; and a fourth filter, wherein the third and the fourth fast Fourier transformers perform fast Fourier transform on the signal introduced as a reflected wave to decompose the signal into frequency components, and
the third filter and the fourth filter remove waves having frequency components that are not outputted from the corresponding RF generator between the third RF generator and the fourth RF generator.