| 摘要 |
[Object] To provide a wireless sensor device capable of detecting a minute variation with high sensitivity by avoiding the deterioration of sensitivity for sensing the motion of a detection target. [Solution] The wireless sensor device 100 includes an antenna 1 configured to radiate a transmission signal and receive a reflected signal caused by the transmission signal reflected by a detection target, a transmission circuit 2 including an output terminal 2a, connected to the antenna 1, and configured to generate the transmission signal, a detector circuit 3 in which part of the transmission signal and the reflected signal received by the antenna 1 are input thereinto and detected while the transmission signal is transmitted from the transmission circuit 2, the detector circuit 3 being connected to the output terminal 2a, a signal processing circuit 4 connected to the detector circuit 3 and configured to process a signal output from the detector circuit 3, and a control circuit 3 connected to the transmission circuit 2 and configured to control the transmission circuit 2, wherein, between the antenna 1 and the output terminal 2a, a plurality of transmission lines whose line lengths are different from one another and switching means for switching between the plural transmission lines and connecting the antenna 1 and the output terminal 2a to each other are provided, and differences in line length between the plural transmission lines are less than one-fourth of a wavelength of the transmission signal. |
