| 摘要 |
The present invention provides a novel surface acoustic wave device enabling increase in electrode width without generating MEL and capable of operating in a high-frequency band higher than or equal to the UHF band, and to provide a communication device not requiring any down-converter which is indispensable to the conventional high-frequency communication device, and capable of being manufactured at a reduced cost. A surface acoustic wave device is provided with an electrode structure meeting conditions represented by: s + m = (2n + l)L/(4k), where L is electrode period not taking into consideration a polarity of an interdigital transducer, m is electrode line width, s is minimum electrode gap width, and n and k are natural numbers. The surface acoustic wave device is used as the demodulator of a communication device. The surface acoustic wave device enables increase in electrode width without generating MEL and is capable of operating in a high-frequency band higher than or equal to the UHF band. A communication device incorporating the surface acoustic wave device of the present invention need not be provided with any down-converter, and hence the communication device has a simple circuit configuration and can be manufactured at a low cost. <MATH> |
