本論文提出表面聲波諧振器、階梯式表面聲波濾波器和雙工器的模擬方法。透過文中的模擬方法所設計的雙工器，與傳統的電路相比有以下幾點優勢:(一)於通帶中較低的插入損號，(二)於截止頻帶上更大的下降斜率、(三)於拒帶上較高的插入損號。由於階梯式表面聲波濾波器與多指濾波器和雙模態濾波器相比，有最低的插入損耗、最大的頻寬和最高的功率耐受度，故本論文中的雙工器是由兩個階梯式表面聲波濾波器所組成，以達到更佳的特性。階梯式濾波器是基於一個串聯諧振器和一個並聯接地的諧振器電路，經過多階的串聯後所構成。此篇論文的諧振器模擬是透過集總元件的電路模型在ADS模擬軟體中進行驗證，並針對指叉狀電極對數和重疊長度的變化進行討論。
透過與傳統雙工器電路的比較，本文提出一組最佳的參數模擬結果，設定壓電基板為48°YX-LiTaO3。其中Tx的操作頻率為824-849(MHz)，Rx的操作頻率為869-894(MHz)，於Tx端最低的插入損耗為0.47(dB)，Rx端最低的插入損耗為1.02(dB)，Tx和Rx之間的隔離度來到40(dB)以下。故透過正確的模擬，能快速且精確的得到濾波器和雙工器電路特性，並能節省實際製造下線的成本，提出更佳的電路設計參數。

In the paper, the circuit simulation methods of surface acoustic wave (SAW) resonator, ladder type SAW filter and SAW duplexer are proposed. The designed duplexer exhibits lower insertion loss in pass band, sharper cut-off frequency and higher insertion loss in rejection band than the conventional circuit. The duplexer consists of two ladder type SAW filters and each ladder type SAW filter is composed of a series resonator and a parallel resonator. The simulation of SAW resonator through ADS (Advanced Design System) is performed with the lumped elements. The performance of the duplexer has dual pass band. The first pass band which applies on Tx is from 824(MHz) to 849(MHz) and the second pass band applying on Rx is from 869(MHz) to 894(MHz). Through the measurement experiment of the duplexer IC performance, we compared the measurement result with simulation result to tune out the best parameters of duplexer circuit in the simulation. The ladder type SAW filters have the lowest insertion loss, the largest band width, and the best power durability comparing with the IIDT (Interdigitated Interdigital Transducer) and DMS (Double Mode SAW). The minimum insertion loss is 0.47(dB) in the first pass band and 1.02(dB) in the second pass band. The isolation performance of the best simulation result between Tx and Rx is less than 40(dB) from 750(MHz) to 950(MHz). Through the precise simulation, the appropriate SAW band pass filter and duplexer will be designed in a simple way.

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