- 學位論文
應用於WLAN之新型MIMO天線設計研製
New Design and Manufacturing of a MIMO Antenna for WLAN standards
摘要
本論文天線(Antenna)為雙頻段MIMO天線。其結構是共平面波導方式(coplanar waveguide，CPW)微帶線、雙環疊構形狀輻射貼片和矩形接地面所組成。首先應用天線基本理論來初步計算出天線所需尺寸，利用Ansoft HFSS 模擬軟體來模擬，設計出雙頻段MIMO天線，實現WLAN IEEE802.11b 與 IEEE802.11n 標準的頻段。並在特性上要求反射損失(Return Loss)S11 ≤-10dB以及隔離度(Isolation)S12≤-15dB以下。 在反射損失S11 ≤ -10dB的情況下，天線一(S11)操作阻抗頻寬為 2.25GHz ~ 2.83GHz以及4.94GHz~5.20GHz，頻寬百分比分別為 22.83% 與 5.13%。天線二(S22)的操作頻寬為2.16GHz~2.78GHz 以及 4.96GHz~5.22GHz頻寬百分比分別為 25.10% 與 5.10%。頻帶包含台灣所使用通訊系統之頻帶；Bluetooth(2400MHz ~ 2450MHz)，無線網路(WLAN, 2400MHz ~ 2485MHz, 5150MHz ~ 5350MHz)。
並列摘要
In this thesis, a dual-band MIMO antenna is presented. The proposed antenna consists of a CPW-fed micro-strip line, bicyclic shape stack structure radiating patch and rectangular shape ground plane. First, we calculate a required size of the antenna. The Ansoft HFSS software is used to perform simulation. The design of a dual-band MIMO antenna satisfies the demand of the IEEE 802.11n and IEEE 802.11b standard band. The return loss of characteristic requirement is under -10dB, and the isolation of characteristic requirement is under -15dB. The spectrum ranges with the measured return loss S11≤ -10dB of antenna is 2.25GHz~2.83GHz and 4.94GHz ~ 5.20GHz, and the percentages of the bandwidth are 22.83% and 5.13%, respectively. The spectrum ranges of the measured return loss S22≤ -10dB of antenna are 2.16GHz ~ 2.78GHz and 4.96GHz ~ 5.22GHz, the percentages of the bandwidth are 25.10% and 5.10%, respectively. The bands of communication systems in Taiwan, such as Bluetooth (2400MHz ~ 2450MHz) , Wireless Local Area Network (WLAN 2400MHz ~ 2485MHz, 5150MHz ~ 5350MHz) are included in the investigation.