Mobile communication systems and surface acoustic wave devices

Abstract With the advent of a highly intelligent society, the role of mobile communication represented by the key words “anytime, anywhere, and with anybody” has become increasingly important. This paper describes mainly the mobile stations of the digital communication system in which the frequency‐use efficiency is improved significantly, as well as of analog mobile communication system. Also described are the surface acoustic wave devices, especially the low insertion loss filters, which are expected to be the key devices of mobile communication for small and lightweight equipment.