本論文設計一適用於802.11b&g的天線收發轉換器，成功的以厚膜製成的技術在氧化鋁上實現。在本論文中分別使用三種不同的濾波器實現。第一種是4階髮夾式濾波器，利用多階濾波器帶通邊緣具有較陡峭響應的特性，以一T 形分波器連接所組成。第二種為使用零度饋入濾波器，利用零度饋入的技術，在通帶的兩邊增加兩零點使帶通的邊緣有較陡峭的響應，以T形分波器連接所組成。第三種為具可控制零點的濾波器，控制零點產生在適當的位置，以增加兩濾波器得隔離度，再以T形分波器連接所組成。

　In this thesis, we design a duplexer for IEEE 802.11b&g by using three difference filters. The first one is four order hairpin filter which has better stopband rejection because of the high order filter´s characteristic. We can combine two filters by using T-junction.The second one is skew-symmetric feed in filter. By using the technique of skew-symmetric feed in, we can increase two transmission zeros near the passband and combine two filters by T-junction. The third one is a filter which has tunable transmission zero. It can increase the isolation between two filters by controlling the transmission zeros.Finally we will fabricate it on Al2O3.

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