臺灣博碩士論文加值系統

本論文使用耦合模態（coupling-of-modes）設計不同應
用之表面聲波濾波器，並以等效電路模型（equivalent circuit
model）做驗證。階梯型式表面聲波濾波器（ladder-type SAW
filter）分別設計於IEEE 802.11a WLAN 以及WiMAX ISM 2.4
GHz 頻段，表面聲波雙工器（SAW duplexer）設計於WiMAX
5 GHz 的頻段，表面聲波濾波器組（SAW filter bank）設計於
700 MHz 頻段。

In this thesis, coupling-of-modes (COM) approach and equivalent circuit model (ECM) are applied to design surface-acoustic wave (SAW) filters for various applications. A ladder-type SAW filter at IEEE 802.11a WLAN band is designed and the chip size is 214 × 115 μm2.
An RF filter for unlicensed band of WiMAX and 802.11b WLAN is proposed and the chip size is 431 × 145 μm2. A miniaturized low-loss SAW duplexer has been developed for the WiMAX band and the chip size is 295 × 226.5 μm2. A six-channel low-loss switchable SAW filter bank is designed for the WiMAX system. It has the insertion loss of less than 1.8 dB, channel bandwidth of 20 MHz, stopband rejection of more than 35 dB, and the chip size is 3 × 1.7 mm2. Those SAW filters are designed on 42 YX-LiTaO3 substrate with aluminum (Al) electrodes. Sensitivity study has also been conducted.
i

Abstract i
Table of Contents iv
List of Figures vii
List of Tables ix
1 Ladder-Type SAW Filter for 802.11a WLAN 1
1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Ladder-Type Filter Configuration . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.1 Design by COM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.2 Verification by ECM . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2 Ladder-Type SAW Filter for WiMAX and 802.11b WLAN 15
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.2 Design by COM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.3 Verification by ECM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.4 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3 SAW Duplexer for WiMAX 27
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.2 Design by COM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.3 Verification by ECM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.4 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4 Switchable SAW Filter Bank for WiMAX Application 41
4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.2 Design by COM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.3 Verification by ECM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
4.4 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

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