Study of CPW Ultra-Wideband Antennas

• Main Authors: Li-Jhe Syu, 徐立哲
• Other Authors: Lih-Shan Chen
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/wbu64n

碩士 === 義守大學 === 電子工程學系 === 104 === CPW ultra-wideband antennas with notch characteristics are investigated in this study. The proposed ultra-wideband antenna works in the frequency range of 3.1 GHz-10.6 GHz. To avoid the interference with WLAN、X-band satellite communication and ITU 8-GHz, the afore-mentioned frequency band are notched. CPW antennas with simple structures are fabricated on FR4substrate with dielectric constant of 4.4. The ground plane of ultra-wideband monopole antenna is connected and a bevel in the upper half of the ground plane is proposed to achieve good impedance matching. An oblique angle ladder pattern is to reach a better impedance matching in the frequency range between 7-8GHz and the lower part of the rectangular patch is to widen the bandwidth of 10GHz to 11GHz. The upper half of the bevel design is to widen the bandwidth of 4GHz and bands of UWB antennas are notched by adding parasitic elements. The I-shaped and L-shaped parasitic elements below ground plane are proposed for band notch. The currents are absorbed by the I-shaped parasitic elements in the frequency of 5.5 GHz and are absorbed in the 7.5 GHz by the L-shaped parasitic elements. Simulated and measured results show good agreement.