The design and measurement of an IF SAW filter

• Main Authors: Wang , Sheng - Ming, 王聖銘
• Other Authors: T.-T. Wu
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/69098823804252103813

碩士 === 國立臺灣大學 === 應用力學研究所 === 90 === A vast market exists for surface acoustic devices (SAW) in areas such as wireless communication and a variety of sensor applications. In particular, in the current mobile phone industry, the demand for SAW devices has led to a commercial market with a respectable level in annual sale. This paper presents a study on the comparison of two COM models for SAW filter design. 400 MHz two port SAW filters were designed and fabricated to check the feasibility of the two COM models. Influences of the key parameters, such as the number of pairs of IDT, the cross length of the IDT, the delay distance, the number of the grating IDT pairs, etc., are discussed. Two-port ST-quartz based 400 MHz SAW filters are fabricated and tested. Results show that simulated results obtained by using the Abbott’s model are in good agreement with those from the measurements.