【摘要】 为扩大射频识别系统中阅读器天线的有效识别范围,设计了一款宽波束圆极化微带天线。天线采用输出相位差为90°的功分器正交馈电激励起圆极化波,并结合圆形金属电容片耦合馈电技术、贴片表面开槽技术以及使用折叠导体墙结构。整体尺寸为113 mm×113 mm×13.27 mm,圆极化轴比带宽以及阻抗带宽均覆盖840~960 MHz,天线3 d B波瓣宽度为104°,增益值为4.8 d Bi。更多还原

【Abstract】 In order to expand the effective recognition range of the reader antenna used in the radio frequency identification system,a wide beam circularly-polarized microstrip antenna was designed. The Wilkinson power divider′ s orthogonal feeding with 90° output phase difference is used in the antenna to stimulate the circularly-polarized wave. The coupling feed technology of the circular metal capacitance sheets,paster surface slotting technology and fold conducting wall structure are combined in the antenna. The overall dimension of the antenna is 113 mm×113 mm×13.27 mm. The circularly-polarized axial ratio bandwidth and impedance bandwidth are 840~960 MHz. The 3 d B beam width of the antenna is 104°,and its gain is 4.8 d Bi.更多还原