5g微帶陣列天線講解

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(shè)計(jì) 一個(gè)工作在5G的4X4的天線陣列。評(píng)分標(biāo)準(zhǔn)：良：帶寬7%優(yōu)：帶寬7%1效率大于60%1微帶輻射貼片尺寸估算設(shè)計(jì)微帶天線的第一步是選擇合適的介質(zhì)基板，假設(shè)介質(zhì)的介電常數(shù)為 。， 對(duì)于工作頻率f的矩形微帶天線，可以用下式設(shè)計(jì)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 八/2；這里Ke是介質(zhì)內(nèi)的導(dǎo)波 波長，即為：cf ;e考慮到邊緣縮短效應(yīng)后，實(shí)際上的輻射單元長度 L應(yīng)為:L =- 2 工 L2 f . ；e式中，e是有效介電常數(shù)，AL是等效輻射縫隙長度。它們可以分別用下式 計(jì)算，

2、即為：.1r 1Jr 7h -；e = (1 12 ) 222 w(；e 0.3)(w/h 0.264)L 0.412h (；e 0.258)(w/h 0.8)2.單元的仿真由所給要求以及上述公式計(jì)算得輻射貼片的長度L=19.15mm,W=23.72mmfi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(dòng)饋電的位置獲得阻抗匹配，設(shè)饋電點(diǎn)距離上寬邊的偏移量為dx,經(jīng)仿真得到當(dāng)dx=4mn'M,阻抗匹配最好。另外，之前計(jì)算出 的尺寸得到的諧振點(diǎn)略有偏移，經(jīng)過仿真優(yōu)化后貼片尺寸變?yōu)?L=19mm,W=23.72mm&真結(jié)果圖如圖2,圖3所示。圖2 S11參數(shù)

3、10.00XY Plot 2HFSSDesignlANSOFT圖3增益圖從圖中可以看出諧振點(diǎn)為5GHz計(jì)算的相對(duì)帶寬為2.2%,增益為5.78dB2. 2X2陣列設(shè)計(jì)設(shè)計(jì)饋電網(wǎng)絡(luò)并組陣，模型圖如圖 4所示。圖4 2X2微帶天線陣列XY Plot 12HFSSDesignlANSOFTFreq GHz圖5 S11參數(shù)由S11參數(shù)可以看到2X2陣列天線諧振點(diǎn)為5GHz且此時(shí)的S11=-19dB,說明 反射損耗小，匹配良好。相對(duì)帶寬約為 2.8%。m1m2m4m3NameXY-1.000013,9625m2 -57.00003.3614m3 -90.0000 -8.5636XY Plot 13HFS

4、SDesign1 ansoftm4.0079,0000-6.8066a -10.00-40.00Curve Info dB(GainTotal)Setup1 : LastAdaptive Freq='5GHz' P hi='0deg' dB(GainTotal) Setup1 : LastAdaptive Freq='5GHz' P hi='90deg'-200.00-150.00-100.00-50.000.0050.00100.00150.00200.00Theta deg0.00 -20.00 -30.00 一Radiati

5、on Pattern 2HFSSDesignlANSOFTCurve InfodB(GainTotal)Setup1 : LastAdaptiveFreq='5GHz' P hi='0deg' dB(GainTotal)Setup1 : LastAdaptiveFreq='5GHz' P hi='90deg'圖6方向圖由方向圖可以看出2X2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 X 4陣列天線天線陣列如圖7所示：圖74 X4陣列天線XY Plot 6HFSSDesig

6、n1-10.00-12.50-15.00-17.50-20.00-22.50Freq GHzm0.00 4.9540-10.2723m25.0560-10.4730.一 dB(S(1,1)Setup1 : Sw eep dy='12mm'6 00圖8 S11參數(shù)NameXYm.00-3.000019.9638m232.00008.1731但0023.00006.8050XY Plot'SHFSSDesign1 叮m210.005.000.00-5.00-10.00-15.00-20.00-25.00pd- naBd-200.00-150.00-100.00-50.000

7、.00Theta deg50.00圖9方向圖Setup dx1 =Setup dx1 =100.00150.00200.00HFSSDesign1 ansoftCurve Info dB(GainTotal)Setup1 : LastAdaptivedx1='60mm' Freq='5GHz' P hi='0deg'dB(GainTotal)Setup1 : LastAdaptivedx1='60mm' Freq='5GHz' P hi='90deg'由S11參數(shù)圖可以看到諧振點(diǎn)在5GHz反射損耗較

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