| 摘要 |
[Problem] To provide a state detection device wherein it is possible to widen the frequency bandwidth of an antenna compared to the prior air such that the transmission/reception frequency enters within the frequency bandwidth of the antenna even if the resonance frequency of the antenna becomes partially offset. [Solution] A first printed wiring board (351) and a second printed wiring board (352) are disposed facing one another. A detection and transmission/reception circuit (400) for detecting and transmitting a given physical amount of a tire and printed wires (351a) for an antenna are formed on the first printed wiring board (351), and printed wires (352a) for an antenna are formed on the second printed wiring board (352). A flat conductor plate (361) is secured to the second printed wiring board (352) of a device main body (300) such that the flat conductor plate (361) is positioned between an antenna (450) and a metal surface to be attached, the antenna (450) being formed by conductively connecting the printed wires (351a, 352a) for an antenna in the form of a coil by means of columnar connection conductors (354). |
