Design of a dipole antenna with asymmetric structure for DTV/GSM900 applications

• Main Authors: Chi-yang Lin, 林智陽
• Other Authors: I-Tseng Tang
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/76482282861269009354

碩士 === 國立臺南大學 === 綠色能源科技研究所碩士班 === 99 === In the last few years, more countries offer digital television broadcasting (DTV) services with video and audio, therefore, DTV signals reception has thus become very attractive for applications in many devices such as notebooks, tablet PC, PMPs and vehicles, etc. thus, a printed dipole antenna with asymmetric C-shape strips for digital television signal reception in the 470–862 MHz band is presented. At first, propose antenna transforms from a symmetric back to back C-shape strips fundamental dipole antenna, the length of the dipole antenna are roughly fixed at λ/2 as design rule. In order to enhance the bandwidth considerably, asymmetric structure is used to generate a resonate mode at high frequency. Two adjacent resonant modes form a wide operating band, and it makes antenna performance could cover all DTV bands (470–862 MHz) in Return Loss≦-6 dB bandwidth. In order to reduce the antenna length further, putting meander line extend from feed line at gap between dual-C-shape strips, by meander number is increased, and a based resonant mode could move to low frequency; furthermore, a new resonant mode would be generated at high frequency for GSM900 (880–960 MHz) signal reception in Return Loss≦-6 dB. The proposed antenna is designed on FR4, last size is fixed at 207 × 24 mm2, the radiation E-plane patterns are displayed with traditional 8-shaped patterns, and H-plane patterns are shown omni-directional.