SAW devices in cellular and cordless phones

Cordless and cellular phone systems are one of the most rapidly growing areas of telecommunication and have become part of modern life. In addition personal communication with global access and wireless data networks will emerge. Handheld phones provoked a continuously increasing demand on miniaturized high performance components and led to the establishment of SAW filters in their radio circuits. Inversely the specific performance of SAW components influences the architecture of the receiver circuit. Radio quality could be increased, weight, size and total circuit cost were reduced. The present paper reviews specific requirements of filtering tasks in cellular and cordless phones. It shows benefits of SAW devices and explains challenges SAW designers face today. A number of representative filter solutions are sketched giving a brief outline of today´s state of the art