Improved Power Durability of Surface Acoustic Wave Filters for an Antenna Duplexers

Autor:	Tokihiro Nishihara, Osamu Ikata, Hidema Uchishiba, Yoshio Satoh
Rok vydání:	1995
Předmět:	Materials science business.industry Surface acoustic wave General Engineering General Physics and Astronomy Chip Durability Filter design Resonator Duplexer Filter (video) Optoelectronics Antenna (radio) business
Zdroj:	Japanese Journal of Applied Physics. 34:2688
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.34.2688
Popis:	For portable telephone applications, we improved the power durability of ladder-type filters composed of one-port surface acoustic wave (SAW) resonators. In these ladder-type filters, the chip temperature was raised and power durability was weak around both cut-off frequencies in transmission characteristics. Power durability tests of a duplexer composed of ladder-type filters showed that the receiver filter (Rx) in which the power was leaked from the transmitter one (Tx) was weaker than the Tx. We therefore studied Rx in this work. In filter design, reducing the resonator resistance to suppress the rise in chip temperature improved power durability. The lifetime of electrode material was improved to up to 10,000 times longer than that of an Al-Cu single-layer film by use of a 3-layered film of Al-Cu/Cu/Al-Cu.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5f556fb0eca01fbc9690bbaa99a57d31 https://doi.org/10.1143/jjap.34.2688 Zobrazit plný text záznamu