一种宽带并馈全向天线的应用

Application of a Wideband Shunt-fed Omnidirectional Antenna

提出一种中等增益宽带并馈全向天线,该天线包含2个背靠背印制在介质板两侧上的偶极子,以及2对与印制板垂直交叉的非对称寄生金属片。2个背靠背偶极子通过并馈方式组成阵列,增大了该天线的增益;两对非对称寄生金属片的引入,形成了等效的2个三维偶极天线子,提升了天线的全向辐射性能,改善了天线的不圆度。测试结果表明,该天线在800~2 100 MHz频段(89.7%)内电压驻波比小于2.5,增益大于3.5 dB,不圆度小于2.5 dB。

A wideband shunt-fed omnidirectional antenna with medium gain is presented, which consists of two back-to-back dipole elements printed on both sides of a substrate and two pairs of asymmetric parasitic metal patches that are perpendicular to the substrate. The gain of the antenna is increased by combining the two back-to-back dipoles to form an array. The introduction of the two pairs of asymmetric parasitic metal patches forms two equivalent 3-D dipole antennas, which improves the omnidirectional radiation performance as well as the gain variation of the antenna. The measured results show that within operating bandwidth of 800~2 100 MHz(89.7%), the VSWR<2.5, gain>3.5 dB, and gain variation<2.5 dB.