To provide a detector which improves detection efficiency and reduces the number of parts.
A detecting module 2A of the detector 1 includes a detection circuit 11 and loop antennas 3A, 3B and 3C. The detection circuit 11 is connected to a first diode 4, a first capacitor 5, a second diode 6, a second capacitor 7 and reference potential terminals 8A, 8B, 8C and output terminals 9A, 9B and 9C as shown in Fig.2. The loop antennas 3A, 3B and 3C are connected in parallel with an inner capacity including a parasitic capacity 4c of the first diode 4 and the first capacitor 5, and used as an inductor having a self-inductance of an inductive reactance of the same value as that of the capacitive reactance of the inner capacity. Thus, they resonate in parallel to cancel the inner capacity.
Takashi Ito
Yoshimi Hatanaka
Naoko Okura
Fumari Tamari
Takeyuki Suzuki
Shiro Isoda
Yohei Takahashi