PRINTED COPLANAR WAVEGUIDE-FED MULTI-BAND AND ULTRA-WIDEBAND ANTENNA DESIGNS

• Main Authors: Wen-Cheng Chiu, 邱文政
• Other Authors: Hwann-Kaeo Chiou
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/84016184605208787331

碩士 === 國立中央大學 === 電機工程學系在職專班 === 101 === English Abstract The 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.