多頻多模整合被動元件模組

Abstract

通訊系統前端的射頻元件整合模組是現今發展的趨勢，本論文提出包括雙工器與兩個不同頻段的帶通濾波器之整合模組，利用低溫共燒陶瓷(Low Temperature Co-fired Ceramics，LTCC)製程設計出符合WLAN 802.11a/b/g頻段的雙工器模組，符合現今通訊產品體積縮小化，高選擇性，及高整合度的元件。在本論文中，以Ansoft HFSS全波分析軟體及Microwave office電路模擬軟體作為設計之工具，提出帶通、低通濾波器和雙工器及其整合模組以應用於無線區域網路 ( Wireless Local Area Netowrk，WLAN ) 系統。本文中所提出的兩種帶通濾波器結構，其一是將三階梳型濾波器加入一耦合電容以達到產生傳輸零點高選擇性的效果，另一種是雙零點帶通濾波器，其是藉由多重傳輸路徑而產生通帶兩側的傳輸零點。低通濾波器部份則是利用定k值與導m型組合式的複合結構。雙工器由低通與帶通濾波器結合而成。最後雙工器模組是將雙工器接上不同頻段的帶通濾波器，在2.4 GHz與5.2 GHz WLAN 頻段分別具有低損耗和高選擇性的頻率響應，以滿足 2.4 GHz和5.2 GHz WLAN系統的需求。

Nowadays ,It’s the trend to integrate RF device of WLAN system ,this thesis presents a integrated module of a diplexer and two band pass filters of different bands by using LTCC technique. Design the diplexer module will meet IEEE802.11a(5.2GHz、5.7GHz) and 802.11b/g(2.4GHz) wireless LAN’s specifications. The device conforms to small size and high selectivity. In the thesis, the simulation tool is Ansoft HFSS and Microwave office. This thesis presents two structures of band pass filters, one is the LTCC three-order comb-line filter with cross-coupled capacitor, and another is two-order with two transmission zero band pass filter. The low pass filter is a complex device of constant k filter and m-derived filter. The diplexer is composite of the band pass filter and the low pass filter. Finally, the diplexer module is a composite of diplexer and two band pass filters. It has low insertion loss and high selectivity in 2.4GHz and 5GHz bands, to meet IEEE 802.11a/b/g wireless LAN’s specifications.