| 摘要 |
An antenna unit includes a receiving antenna which is arranged on an outer surface of a subject and receives a radio signal transmitted at a first frequency from a body-insertable device inserted into an inside of the subject; a main body part which is attached to an outside of the subject. The main body part includes a frequency converter that converts the signal of the first frequency received by the receiving antenna into a signal of a second frequency and a transmitting antenna that transmits the signal of the second frequency as a radio signal. The antenna unit also includes a signal line which connects the receiving antenna and the main body part.
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