g微帶陣列天線

1、5G微帶陣列天線要求：利用介質(zhì)常數(shù)為2.2，厚度為1mm，損耗角為0.0009的介質(zhì)，設計一個工作在5G的4X4的天線陣列。評分標準：良：帶寬7%優(yōu)：帶寬7%且效率大于60%1微帶輻射貼片尺寸估算設計微帶天線的第一步是選擇適宜的介質(zhì)基板，假設介質(zhì)的介電常數(shù)為，對于工作頻率f的矩形微帶天線，可以用下式設計出高效率輻射貼片的寬度W，即為： 式中，c是光速，輻射貼片的長度一般取為；這里是介質(zhì)內(nèi)的導波波長，即為：考慮到邊緣縮短效應后，實際上的輻射單元長度L應為：式中，是有效介電常數(shù)，是等效輻射縫隙長度。它們可以分別用下式計算，即為：2.單元的仿真由所給要求以及上述公式計算得輻射貼片的長度L=19.15

2、mm,W=23.72mm。采用非輻射邊饋電方式，模型如圖1所示：圖1 單元模型此種饋電方式，可以通過移動饋電的位置獲得阻抗匹配，設饋電點距離上寬邊的偏移量為dx,經(jīng)仿真得到當dx=4mm時，阻抗匹配最好。另外，之前計算出的尺寸得到的諧振點略有偏移，經(jīng)過仿真優(yōu)化后貼片尺寸變?yōu)長=19mm,W=23.72mm。仿真結(jié)果圖如圖2，圖3所示。圖2 S11參數(shù)圖3 增益圖從圖中可以看出諧振點為5GHz，計算的相對帶寬為2.2%，增益為5.78dB。2. 2×2陣列設計設計饋電網(wǎng)絡并組陣，模型圖如圖4所示。圖4 2×2微帶天線陣列圖 5 S11參數(shù)由S11參數(shù)可以看到2×2陣

3、列天線諧振點為5GHz，且此時的S11=-19dB，說明反射損耗小，匹配良好。相對帶寬約為2.8%。圖 6 方向圖由方向圖可以看出2×2陣列天線的增益為13.96dB,第一副瓣電平為-10.6dB，可知組陣能使天線的增益變高。3. 4×4陣列天線天線陣列如圖7所示：圖7 4×4陣列天線圖8 S11參數(shù)圖9 方向圖由S11參數(shù)圖可以看到諧振點在5GHz，反射損耗較小，帶寬約為2%。由方向圖可以看到增益約為19.96dB，第一副瓣電平為-11.79dB。 參考文獻 1 ITU Global Standard for International Mobile Telec

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