Patent ID: 11898840
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A measuring device comprising:
a substrate disposed on a substrate support of a plasma processing apparatus;
a transmission circuit provided in the substrate, and configured to generate a microwave;
a transmitting antenna provided in the substrate, and configured to transmit the microwave generated by the transmission circuit as a transmission wave;
at least one receiving antenna provided in the substrate, and configured to receive a reflected wave of the transmission wave by plasma above the substrate support as at least one reception wave;
a reception demodulation circuit provided in the substrate, and configured to generate at least one signal that reflects a thickness of a sheath between the substrate and the plasma, from the at least one reception wave; and
a calculator provided in the substrate, and configured to obtain the thickness from the at least one signal.