未盖上板与盖上板天线比较

Presenter:Ying-ChihLiAdviser:Dr.Hung-ChiYangDate:2008.09.02未蓋上板與蓋上板天線比較1Substrate:陶瓷(εγ

:27.9)Substrate:FR-4(εγ

:4.4)Substrate:RO(εγ:10.2)16mm18mm總長:47.315mm42.85總長:52.6355mm25.5總長:79.45mm未蓋上板天線圖型2未蓋上板ReturnLoss404.5MHz33D輻射場型Substrate:FR-4Freq:404.5MHz

Substrate:陶瓷Freq:404.5

MHzSubstrate:ROFreq:404.5MHz4電流分佈Substrate:FR-4相位:0度Substrate:FR-4相位:180度Substrate:陶瓷相位:0度Substrate:陶瓷相位:180度5Substrate:RO相位:0度Substrate:RO相位:180度6Substrate:FR-4Substrate:陶瓷Substrate:RO未上蓋板SAR值分佈7SubstrateFR-4RO陶瓷陶瓷(雙螺旋)Frequency(MHz)404.5404.5404.5402Returnloss(dB)-20.64-16.57-16.32-43Bandwidth(MHz)188.5134.12134.12100Gain-24-23-21.1-19SAR(W/Kg)229315142.79327Permittivity4.410.227.79.827.9未蓋上板參數比較8蓋上板天線比較9Superstrate:氧化鋁Substrate:陶瓷總長:59mmSuperstrate:FR-4Substrate:FR-4總長:81.115mm總長:100.685mm5mm2.6mm16mm18mm天線圖型10915MHzReturnLoss11相位:0度Freq:400.88MHz相位:180度Freq:400.88MHz相位:0度Freq:915MHz相位:180度Freq:915MHz電流分佈12FR-4相位0度FR-4相位180度蓋上板電流分佈13Substrate:氧化鋁Superstrate:陶瓷Freq:400.88MHzSubstrate:FR-4Superstrate:FR-4Substrate:氧化鋁Superstrate:陶瓷Freq:915MHz3D輻射場型14Superstrate:Al2O3Substrate:陶瓷Superstrate:FR-4Substrate：FR-4蓋上版SAR值分佈15SuperstrateFR-4氧化鋁未蓋上板氧化鋁

SubstrateFR-4陶瓷陶瓷陶瓷(雙螺旋)Frequency(MHz)404.5400.88915.63404.5402Returnloss(dB)-23.84-35.57-20.15-16.32-43Bandwidth(MHz)10179.75148.63134.12100Gain-20-18-19-21.1-19SAR(W/Kg)154198142327Permittivity4.49.827.927.99.827.9蓋上板參數比較表16SuperstrateFR-4未蓋上板未蓋上板氧化鋁未蓋上板氧化鋁SubstrateFR-4FR-4陶瓷陶瓷RO陶瓷(雙螺旋)Frequency(MHz)404.5404.5404.5400.88915.63404.5402Returnloss(dB)-23.84-20.64-16.32-35.57-20.15-16.57-43Bandwidth(MHz)101188.5134.1279.75148.63134.12100Gain-20-24-21.1-18-19-23-19SAR(W/Kg)154229142.79198315327Permittivity4.44.427.79.827.910.29.827.91758mm83mm57mm25mm28mm21mm22mm仿體液模擬環境天線在仿體液之距離18ReturnLoss19Distances(mm)83mm(57mm)83mm(8mm)83mm(4mm)原距離(63mm)Frequency(MHz)415.38415.38415.38404.5Returnloss-16.6-16.17-15-16.32Bandwidth(MHz)105.12119.62116134.12Gain-20-27-26-21SAR(W/Kg)142148178143加大仿體液後的參數比較比較結果20Distances(mm)3531252115104原距離(37mm)Bandwidth119.6123.2116126.88117.6108.75112.38134.12Returnloss-15.3-16.01-16.43-17.27-17.5-17.5-16.82-16.32Frequency(MHz)406.5407.1408.13404.5404.5408.13411.75404.5SAR(W/Kg)141143144139138146180143Gain-20.2-22.5-21.8-22.7-28.6-24-26-21不同距離模擬結果越接近皮膚表面21阻抗匹配討論4