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Title page for etd-0222118-092605


URN etd-0222118-092605 Statistics This thesis had been viewed 195 times. Download 0 times.
Author Erh-Shuo Hsu
Author's Email Address No Public.
Department Mechanical Engineering
Year 2017 Semester 1
Degree Master Type of Document Master's Thesis
Language zh-TW.Big5 Chinese Page Count 119
Title Study on 1.58 GHz Ladder-type Surface Acoustic Wave Filter with Coupling-of-mode Model
Keyword
  • One-port SAW resonator
  • ladder-type SAW filter
  • coupling-of-mode model
  • Simplex inversion algorithm
  • Simplex inversion algorithm
  • coupling-of-mode model
  • ladder-type SAW filter
  • One-port SAW resonator
  • Abstract Since surface acoustic wave (SAW) filters have small size and excellent filtering performances, they has played a very crucial role in various wireless communication systems. This study aims to investigating ladder-type SAW filters in the 1.58 GHz GPS band using the coupling-of-mode (COM) model. First introduce the piezoelectric effect and surface acoustic wave filters, and choose lithium tantalate (42° YX LiTaO3) as the piezoelectric substrate in this study. Then, applying the COM model proposed by B.P. Abbott, the characteristics of one-port SAW resonator are described by [P] matrix. The frequency response of the ladder-type SAW filter is calculated with the ABCD transfer matrix. The influences of various design parameters on the device performance are further discussed. Finally, a ladder-type SAW filter in the 1.58 GHz GPS band is actually fabricated, and the S-parameter frequency response is measured using the network analyzer and high-frequency probes. Simplex inversion algorithm is also used to extract COM-model parameters of one-port SAW resonator for comparing the results of measurement and simulation. Results show that a 1.58 GHz GPS band ladder-type SAW filter has been successfully designed and fabricated in this study. The insertion loss will be able to be reduced and meet with the existing commercial specification by improving the electrode material in the future.
    Advisor Committee
  • Yung-Yu Chen - advisor
  • Jia-Hong Sun - co-chair
  • Shih-Yung Pao - co-chair
  • Files indicate in-campus access only
    Date of Defense 2018-01-22 Date of Submission 2018-02-22


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