天線工程期中報告 論文研討: 報告人: 碩研通訊一甲 MA130224 李堅誌 Design of An internal planar monopole antenna For WUSB Dongle application 作者: Youngki Lee*, Yeonsik Yu, Soonyong Lee, Jaehoon Choi 出處： Feb. 15-18,2009 ICACT 2009 報告人: 碩研通訊一甲 MA130224 李堅誌 Southern Taiwan University Department of Electronic Engineering

摘要 Abstract- In this paper, an internal planar monopole antenna for use in WUSB dongle application Is proposed. The planar antenna consists of amodified meander-strip and an inverted L-strip. The impedance bandwidth of proposed antenna Is enhanced by the mutual coupling between the modifiedmeander-strip and inverted L-shape strip. Feb. 15-18,2009 ICACT 2009 Youngki Lee*, Yeonsik Yu, Soonyong Lee, Jaehoon Choi

天線設計 The proposed antenna consists Of an inverted L-shape strip and a modified meander strip. The ground plane is printed on the bottom layer ofFR4 substrate (20 mm x 41 mm x 0.8 mm, Er =4.4). The inverted L-shape strip is integrated on the bottom Side Of FR4 substrate and is connected with ground plane. The modified meander strip is placed on the top side with height Of 1mm. The modified meander strip consists Of a meander line with a folded line. It is fed by a 50 Q coaxhole while inverted L-shape strip is connected to the ground plane. The proposed antenna occupies a compact volume Of 10 mm x 20 mm x 1 mm, which allows it to be easily concealed within the casing Of the general USB dongle as an internal antenna.ial cable through via Feb. 15-18,2009 ICACT 2009 Youngki Lee*, Yeonsik Yu, Soonyong Lee, Jaehoon Choi

天線結構圖 Feb. 15-18,2009 ICACT 2009 Youngki Lee*, Yeonsik Yu, Soonyong Lee, Jaehoon Choi

模擬結果 Figure 2 shows the return loss characteristics of the proposed antenna in each stage of the manufacturing process. To obtain the wideband characteristic, inverted L-shaped strip was placed on the ground plane. The wideband performance is obtained by the mutual coupling between the modified meander strip and the inverted L-shaped strip. Feb. 15-18,2009 ICACT 2009 Youngki Lee*, Yeonsik Yu, Soonyong Lee, Jaehoon Choi

Figure 3(a) shows the simulated return loss characteristics Of the proposed antenna for various values inverted L-shape strip length(W1).The variation of the inverted L-shape strip length provides the tuning capability for upper band resonance frequency without affecting the return loss characteristics in lower band. By adjusting the length of the inverted L-shape strip, the impedance matching can be improved and wideband operation characteristics can be obtained. Figure 3(b) shows the simulated return loss characteristics Of the antenna for various feeding point (Lf) location values varying from 1 to 4 mm. The variation Of feeding point can provide the tuning capability for upper band impedance matching without affecting the return loss characteristics in lower band. Feb. 15-18,2009 ICACT 2009 Youngki Lee*, Yeonsik Yu, Soonyong Lee, Jaehoon Choi

實作與測量 The measured and simulated return loss values in terms of frequency are compared in Figure 5.There exists good agreement between the two data sets. The result shows that 10dB return loss bandwidths are 580 MHz (2250 '" 2830 MHz) at 2540 MHz and 1100 MHz (4900 '" 6000 MHz) at 5450 MHz. The obtained bandwidth is wide enough to cover Wibro (2300 - 2390 MHz), WiMax (2500 - 2700 MHz), SDMB (2605 - 2655 MHz), 2.4GHz WLAN (2400 - 2483 MHz) and 5.2 / 5.8 GHz WLAN (5150 - 5825 MHz) at the same time. 問題：為什麼模擬的頻寬會比較好，是不是有關製程還是在計算上錯誤，是否還能做出更好的。 Feb. 15-18,2009 ICACT 2009 Youngki Lee*, Yeonsik Yu, Soonyong Lee, Jaehoon Choi

電流分佈圖 The measured radiation patterns in the x-y and y-z planes at operating frequencies Of 2.3 GHz, 2.5 GHz, 5.5 GHz are shown in figure 5.Patterns are good enough to be used for wireless application. Feb. 15-18,2009 ICACT 2009 Youngki Lee*, Yeonsik Yu, Soonyong Lee, Jaehoon Choi

結論 A compact wideband planar monopole antenna was developed for WiBro, SDMB, WLAN, and WiMAX applications. The antenna size is reduced by folded Configurations Of a modified meander strip and an inverted L-shape strip which are printed separately on the top and bottom sides Of a substrate. The impedance bandwidth is enhanced by the mutual coupling between the two strips. The proposed planar antenna occupies a compact volume, has a wide bandwidth, and can be easily embedded into the casing Of a general WUSB dongle. Feb. 15-18,2009 ICACT 2009 Youngki Lee*, Yeonsik Yu, Soonyong Lee, Jaehoon Choi

心得： 之前就對無線有點好奇了，這次看完這篇後讓我知道了很多無線傳輸的知識，如：共振跟回波等等。雖然研究比較不屬於這方面不是關於這面的，但是我相信這對我成長也是很有幫助的。 Feb. 15-18,2009 ICACT 2009 Youngki Lee*, Yeonsik Yu, Soonyong Lee, Jaehoon Choi