DESIGN AND RADIATION EFFICIENCY ANALYSIS OF MICROSTRIP ANTENNA ARRAY

• Main Authors: Sheng-Kuei Chou, 周聖貴
• Other Authors: Chi-Fang Huang
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/50293177623156508694

碩士 === 大同大學 === 通訊工程研究所 === 100 === For the point-to-point long distance wireless communication, single-element antenna has radiation patterns that are broad and hence have a low directivity and low gain. Hence it is not suitable for long distance communication. This thesis presents design and radiation efficiency analysis of microstrip antenna array. In order to achieve better gain, efficiency, and directivity, antenna array is adopted and its radiation efficiency is measured by the Wheeler cap method. Firstly, a single-element patch antenna that operating frequency at 2.45GHz is utilized. Secondly, several different structural layouts on feed network like different T-junction and angle of bend on the T-junction are simulated and testified. Finally, different antenna’s efficiency performances are designed and tested for two-element antenna and four-element microstrip array that configured by different element spacing (wavelength) in 0.7λ, 0.8λ, and 0.9λ. With the increase of the distance between the elements and overall number of elements, antenna gain and directivity is improved, meanwhile; however, the side beam is improved and the radiation efficiency is decreased. The feed network will be more complex and more loss, led to decrease of current on the patch. As a conclusion, the maximum microstrip antenna gain is determined to be 8.02 dBi in the four-element array; its layout element spacing is 0.9λ and relevant radiation efficiency is measured as 69%.