Chinese Abstract (中文摘要)現今行動裝置的使用，發展非常蓬勃，因此天線設計扮演著重要的角色。本論文是針對兩個用途不同的印刷共面波導饋入式天線，提出探討：一個是多頻段區塊的應用；另一個則是用於超寬頻的區塊。這兩個天線的設計均使用印刷電路板與共面波導饋入式結構，其印刷電路板設計可以降低製造成本，又因其輻射天線主體和接地面都印刷在基板上的同一側，所以又可降低製造之複雜性。天線設計的參數影響之研究是透過使用Ansoft HFSS來模擬並利用量測阻抗頻寬和輻射場型來驗證。印刷共面波導饋入式多頻段天線設計，尺寸為30毫米×35毫米×1.6毫米的單層FR4基板上使用L形縫與倒L形槽孔。其阻抗頻寬量測結果為2.335–2.579 GHz和2.9125–5.9 GHz，可應用於2.4/5.2/5.8-GHz (2.4–2.4835 GHz/5.15–5.35 GHz/5.725–5.825 GHz)無線區域網路(WLAN)和3.5-GHz(3.3–3.8 GHz)的微波存取全球互通(WiMAX)等多頻段。印刷共面波導饋入式超寬頻天線設計，使用兩個非對稱共面接地面，其功能可增加頻寬。天線設計具有簡單的架構並印刷在尺寸為30毫米×40毫米×1.6毫米的單層FR4基板上。其量測結果具有非常寬的阻抗頻寬2.85–11.5 GHz （4.035:1頻寬或 115.3%），符合美國聯邦通信委員會3.1–10.6 GHz超寬頻帶的規範。English AbstractThe antenna design plays an important role as the usage of mobile devices nowadays has become booming. This thesis proposes two printed coplanar waveguide (CPW)-fed antennas: one is for multi-band applications; the other is for ultra-wideband (UWB) applications.The two antennas are designed on printed circuit boards (PCBs) with the CPW-fed structure. Using PCBs can lower the manufacturing cost. Both a radiating element and ground planes printed on the same side of the substrate can decrease the fabrication complexity. The study of parametric effects on antenna designs is performed by using Ansoft’s High Frequency Structure Simulator (HFSS), and then followed by measuring impedance bandwidth and radiation patterns for verifications.One is a printed CPW-fed multi-band antenna design with an L-shaped slit and an inverted L-shaped slot designed on the radiating element. The proposed antenna is printed on a single-layer FR4 substrate with the volume 30 mm × 35 mm × 1.6 mm. The measured impedance bandwidth of the proposed antenna is 2.335–2.579 GHz and 2.9125–5.9 GHz, which is capable of the multi-band operations at 2.4/5.2/5.8-GHz (2.4–2.4835 GHz/5.15–5.35 GHz/5. 725–5.825 GHz) for Wireless Local Area Network (WLAN) and 3.5-GHz (3.3–3.8 GHz) for Worldwide Interoperability for Microwave Access (WiMAX).The other is a printed CPW-fed UWB antenna design with two asymmetric coplanar ground planes. The CPW-fed asymmetric ground planes are adopted in the proposed antenna to broaden the impedance bandwidth. The proposed antenna has a simple configuration and is printed on a single-layer FR4 substrate with the volume 30 mm × 40 mm × 1.6 mm. The measured impedance bandwidth of the proposed UWB antenna is capable of a very wide bandwidth 2.85–11.5 GHz (4.035:1 bandwidth or 115.3%), which completely covers the UWB band of 3.1–10.6 GHz regulated by FCC for communications.
