| 摘要 |
To provide a condition detection device that can widen a frequency band of an antenna more than a conventional example so a transmission and reception frequency is in the frequency band of the antenna even if a resonant frequency of the antenna shifts somewhat.[Resolution Means] A first printed wiring substrate 351 on which a detection and transceiver circuit 400, which detects and transmits a predetermined physical quantity of a tire, and printed wiring 351a for an antenna are formed and a second printed wiring substrate 352 on which printed wiring 352a for the antenna is formed are disposed so as to oppose each other, and a planar conductor plate 361 is provided by being fixed, so as to be positioned between an antenna 450 and a metal face to which mounting takes place, on the second printed wiring substrate 352 of a device main body 300 in which the antenna 450 is formed by conductively connecting the printed wirings 351a, 352a for the antenna in a coil shape by a columnar connection conductor 354. |
