天线的设计专业英语

1、组员：11.INTRODUCTION1.INTRODUCTIONlIn this paper, a new CPW-fed star-shaped patch antenna which is realized by merging two triangular shape patches that is backed by rectangular ring shape ground plane, is proposed. The merging of two triangular shape patches followed by offset placement of two patche

2、s and feed position optimization,yields input impedance matching over wide frequency range.lDue to realized wideband response, proposed configuration can find applications in Wi-Fi, Bluetooth, and WiMAX applications in 17 GHz frequency range. lThe star-shaped patch is first simulated using IE3D soft

3、ware on low cost FR4 substrate .22. CPW-FED STAR SHAPE ANTENNA2. CPW-FED STAR SHAPE ANTENNAl The CPW -fed triangular shape patch is shown in Figure 1(a).The triangular patch is backed by rectangular ring shape ground plane. l The simulated resonance curve plot for triangular patch “T2” is shown in F

4、igure 1(b).l When two triangularm shaped patches are merged, mixing of impedance at their resonant modes occurs which results in increase in input impedance toward lower resonant mode frequencies and decrease in impedance toward higher order resonant mode frequencies, as shown in Figure 1(c).Figures

5、 13 To realize input impedance matching, an offset configuration of two triangular patches is studied in which distance between centroid of inverted triangular patch “C1” is varied with respect to centroid of normal triangular patch “C2.” This variation realizes star shape patch as shown in Figure 2

6、(a).Figures 24 The resonance curve and return loss (S11) plots for variation in distance “x,”which is the distance between vertex of inverted triangular patch (T1) and the base of normal triangular patch (T2), is shown in Figures 3(b).A value of “x” =12 mm is selected for which optimum dual band res

7、ponse is obtained near 4 and 5 GHz frequency band.Figures 35 To improve the impedance matching at lower frequencies, vertex tip of the inverted triangle near CPW fed position is chopped off, as shown in Figure 4(a).With chopping the length, CPW feed is effectively placed near the minimum impedance p

8、oint at the first resonant mode in triangular patch. Figure 4为了改善较低频率下的阻抗匹配，在共面为了改善较低频率下的阻抗匹配，在共面波导馈电位置附近倒三角形的尖端被切断，波导馈电位置附近倒三角形的尖端被切断，如图如图4（a）所示，通过斩波长度、共面）所示，通过斩波长度、共面波导馈电被有效地放置在三角形贴片的第波导馈电被有效地放置在三角形贴片的第一个最小阻抗点附近一个最小阻抗点附近谐振模式谐振模式。6LOREM IPSUM DOLOR The return loss plots for increasing chopping leng

9、th “y” is shown in Figures 5(b).Here, an optimum value of “y” = 7.5 mm is selected for which plots show wideband response at lower resonant modes and minimum possible return loss values for resonant mode around 45 GHz frequencies.一个最佳值的一个最佳值的“Y”= 7.5“Y”= 7.5毫米被选择为图显示毫米被选择为图显示宽带响应在较低的谐振模式和最小可能的回波宽带响应

10、在较低的谐振模式和最小可能的回波损耗值谐振模式约损耗值谐振模式约4 - 5 GHz4 - 5 GHz频率。频率。Figure 57 It is observed from current variation that impedance at that resonant mode can be reduced if CPW fed is placed toward right-hand side in star-shaped patch as shown in Figure 6(b). return loss plot shows values more than -10 dB toward

11、higher frequencies (around 6 GHz) of the band.Figure 6如果共面波导馈电被放置向星形贴片的右侧放置，则如果共面波导馈电被放置向星形贴片的右侧放置，则可以减小该谐振模式下的阻抗。如图可以减小该谐振模式下的阻抗。如图6（b）所示。）所示。Figure 7回波损耗曲线图显示了频带的高频（大约回波损耗曲线图显示了频带的高频（大约6 GHz）超）超过过-10 dB的值。的值。8To improve upon the impedance matching (i.e., S11 10 dB), effects of using tapered CPW fe

12、ed are studied as shown in Figure 8(a).为了改善阻抗匹配（即，为了改善阻抗匹配（即，S11S11小于小于10 dB10 dB），），进行了如图进行了如图8 8（a)a)所示使用锥形共面波导馈所示使用锥形共面波导馈电。电。 The return loss plots for tapered width variation from 1 to 4 mm are shown in Figures 8(c).图图8（C）显示了从）显示了从1到到4毫米的锥形宽度变毫米的锥形宽度变化的回波损耗图。化的回波损耗图。Figure 8Figure 89To validate

13、 the simulated result, antenna was fabricated for x= 12 mm, y = 7.5 mm, s =6 mm, and t = 4 mm on FR4 substrate and was fed using SMA panel type connector. The antenna copolar broadside gain is more than 2 dBi over most of the BW with a peak gain of above 3 dBi. 为了验证模拟结果，在为了验证模拟结果，在FR4基板上制造基板上制造x = 1

14、2mm，y = 7.5mm，s = 6mm，t = 4mm的天线，并使用的天线，并使用SMA面板型连面板型连接器进行馈电。接器进行馈电。 大多数大多数BW的天线共极的天线共极宽边增益大于宽边增益大于2 dBi，峰值增益高于，峰值增益高于3 dBi。103. CONCLUSION3. CONCLUSION New wideband design of CPW-fed star shape patch antenna backed by rectangular ring ground plane, to cover applications like Bluetooth, Wi-Fi and Wi

15、-MAX, and so forth, in 17 GHz frequency range, is proposed. A detail parametric study for variation in various antenna parameters that yields broadband star shape structure is presented. The star-shaped patch gives broadside radiation pattern over the BW with broadside gain of around 23 dBi. 提出了采用矩形接地平面支持的共面波