Title :
Handheld telephone for 800MHz-band cellular radio systems
Author :
Nakagawa, Jun´ichi ; Hikita, Mitsutaka ; Kuwamoto, Y. ; Hagiya, S. ; Iwama, A. ; Kimura, H.
Author_Institution :
Hitachi Ltd., Tokyo, Japan
Abstract :
A small handheld telephone with a volume of 400ml for 800MHz-band cellular radio systems has been developed. The use of several miniaturized RF hybrid modules and costom integrated circuits have reduced the size, weight and power consumption of the developed telephone. Especially, an antenna duplexer with SAW ´Surface Acoustic Wave´ filters contributes to reducing their size and weight. Intermittent operation of a frequency synthesizer reduces the averaged power drain.
Keywords :
Acoustic waves; Energy consumption; Filters; Frequency synthesizers; Hybrid integrated circuits; Land mobile radio cellular systems; Radio frequency; Radiofrequency integrated circuits; Surface acoustic waves; Telephony;
Conference_Titel :
Vehicular Technology Conference, 1987. 37th IEEE
DOI :
10.1109/VTC.1987.1623582
