高拒斥力低溫共燒陶瓷濾波器

Abstract

在本論文中，我們利用低溫共燒陶瓷技術( LTCC )實現小型化濾波器；包括梳型結構的帶通濾波器在2.4GHz和5GHz的無線通訊( WirelessLAN )頻段與2.4GHz的π型低通濾波器。 我們將在論文中提到，如何決定濾波器的原始結構、如何將濾波器原始結構轉為多層架構，與如何利用低溫共燒陶瓷技術實現多層線路架構。另外我們也探討了多層架構所產生的寄生效應與解決、控制的方法；最後並驗證低溫共燒陶瓷技術的縮小化與低損耗的優異性。

The miniaturized filters realized by low temperature co-fired ceramics (LTCC) technology are described in this thesis. The study includes the comb-line band-pass filters in 2.4GHz and 5GHz of WirelessLAN frequency band, and π-section low-pass filter in 2.4GHz. This thesis describes how to decide the prototype filter’s structures, how to construct the prototype filters to the multi-layer structures, and how to use LTCC technology to realize the multi-layer circuit construction. Additionally, the parasitic effects of filter caused by itself multi-layer structures and mounting environment are explored. How to solve and control these parasitic effects is also investigated. The measured results prove the capability of the LTCC technology to miniaturize the filter and still to keep the filter’s performance.