| 摘要 |
The present invention relates to a single pole double throw (SPDT) switch which separates a transmitting signal from a receiving signal in order to transmit/receive an identical frequency signal via an antenna. The present invention is configured such that a difference between an antenna impedance and an impedance of a receiving end is less than a difference between the impedance of the antenna and an impedance of a transmitting end, and a difference between the impedance of the transmitting end and the impedance of the antenna is less than a difference between the impedance of the transmitting end and the impedance of the receiving end. The impedance of the receiving end and the impedance of the transmitting end can be specified by using a pattern of an RF signal line printed in a printed circuit board (PCB). Since the present invention uses a pattern printed in the PCB, a price competitiveness related to a wireless system development can be raised. By using a manual factor having a simple structure, an application is easy and there is no risk for failure by electro static discharge (ESD). |
