High-temperature 434 Mhz surface acoustic wave devices based on GaPO4.
Research into surface acoustic wave (SAW) devices began in the early 1970s and led to the development of high performance, small size, and high reproducibility devices. Much research has now been done on the application of such devices to consumer electronics, process monitoring, and communication systems. The use of novel materials, such as gallium phosphate (GaPO4), extends the operating temperature of the elements. SAW devices based on this material operating at 434 MHz and up 800 degrees C, can be used for passive wireless sensor applications. Interdigital transducer (IDT) devices with platinum/zirconium metallization and 1.4 microm finger-gap ratio of 1:1 have been fabricated using direct write e-beam lithography and a lift-off process. The performance and long-term stability of these devices has been studied, and the results are reported in this paper.
Hamidon
Mohd Nizar
MN
University of Southampton, School of Electronics and Computer Science, Southampton, United Kingdom. mnh@eng.upm.edu.my
Skarda
Vlad
V
White
Neil M
NM
Krispel
Ferdinand
F
Krempl
Peter
P
Binhack
Michael
M
Buff
Werner
W
D000162:Acoustics / Q000295:instrumentation*; D017076:Computer-Aided Design; D017097:Electric Impedance; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005708:Gallium / Q000737:chemistry* / Q000528:radiation effects; D008422:Materials Testing; D008872:Microwaves; D010710:Phosphates / Q000737:chemistry* / Q000528:radiation effects; D013499:Surface Properties
D010710:Phosphates; D005708:Gallium