發明
中華民國
096115903
I 333327
三頻帶通濾波器
國立彰化師範大學
2010/11/11
本專利為透過單一的濾波器電路提供3個商用的無線通訊頻帶。最基本的電路單元是四分之一波長步階式阻抗共振器,對於相同的基本共振頻率而言,四分之一波長步階式阻抗共振器的尺寸比二分之一波長步階式阻抗共振器的尺寸還小。將其中一個共振器設計共振於 1.57 GHz與 5.25 GHz,另一個共振器設計共振於 2.45 GHz,再將此兩個個別的四分之一波長步階式阻抗共振器合併為一個完整的共振器,合併後使個別的四分之一波長共振器共用其中一個線段,以縮小電路尺寸。採用共用線段的結構來設計除可以使電路更小巧外,慎選此共用線段長度,可以提供3個通帶所需的外部品值因素。依此設計理念,本專利案所實現的濾波器其量測結果與模擬結果相當吻合。 A new tri-band microstrip bandpass filter (BPF) is designed to produce three passbands at the commercially practical frequencies through a single piece of filter circuitry. The basic component used to build the proposed filter consists of two quarter-wavelength stepped-impedance resonators (SIRs). One of the quarter-wavelength SIRs is designed to operate at 1.57 GHz and 5.25 GHz, and the other at 2.45 GHz. The feed positions for the two quarter-wavelength SIRs are carefully located to have the same distance from the via-hole ground and meanwhile to give the required external quality factors (Qe’s). In such a way, the microstripline sections between the via-hole and each of the feed positions can be combined into one to simplify the filter structure, and to reduce the BPF circuit size. Performance of the newly designed tri-band BPF is verified by measured results.
本部(發文號1080004615)同意該校108年1月16日研發字第1070400530號函申請終止維護專利。
研究發展處
04-7232105轉1858
版權所有 © 國家科學及技術委員會 National Science and Technology Council All Rights Reserved.
建議使用IE 11或以上版本瀏覽器,最佳瀏覽解析度為1024x768以上|政府網站資料開放宣告
主辦單位:國家科學及技術委員會 執行單位:台灣經濟研究院 網站維護:台灣經濟研究院