天线训练材料20080508_Basic Antenna training Material.pdf

Basic antenna training Material Yuan-Li 2008/058/08 Topic 天線設計原理 Smith chart應用簡介 綫材使用之區別 輔材使用（尺寸等對信號影響） 鐵件天線原理介紹 WiMAX,3G,3.5G等天線架構介紹 內置與外置天線之區別介紹 天線Chamber 簡介 內置天線的未來發展方向介紹 天線設計原理 Antenna in Microwave Communication Link Antenna in Microwave Communication Link Where Pr : Received Power Pt : Transmission Power Gr : Received antenna gain G G λn Gt : Transmission antenna gain R : Distance between Tx and Rx device P r P t t r n n : Multi-path parameter ( 4 πR ) λ : wave length of microwave Tx Rx Pt Pr Antenna are used for converting conducted electromagnetic waves, into electromagnetic waves freely propagating in space and vice versa. Antenna physics wave length • C= f X λ, C = 3 X 10^8m , f = 2400MHz λ= Wave Length λ= C/f = 3 X 10^8m/2400MHz =12.5cm λ/4 = 12.5/4 = 3.125cm = 31.25mm Antenna test Item and test method • VSWR: The indication of reflected power of antenna. • VSWR: The indication of reflected power of antenna. • Bandwidth: Show the operation frequency range of • Bandwidth: Show the operation frequency range of • antenna, f ~ f ,VSWR 2 • antenna, fL~ fH ,VSWR 2 L H • Isolation: The