具有高选择性和谐波抑制的滤波天线设计

Design of A Filtering Antenna with High Selectivity and Harmonic Suppression

设计了一款同时具有高选择性和谐波抑制的滤波天线.通过在正方形微带贴片上蚀刻1对缝隙和在地面上引入两口环DGS,引入2个辐射零点,提高了选择性;通过在接地板上蚀刻2个哑铃型DGS和在馈线上加载1个圆头形开路短截线,谐波抑制达到了12 GHz(4.8 f_(0)).测试结果表明,设计滤波天线工作通带为2.34 GHz~2.42 GHz,在2.28 GHz和2.70 GHz处有两个辐射零点,在3 GHz~12 GHz间的反射系数均大于-4 dB.

In this paper,a filtering antenna with harmonic suppression and high selectivity is designed.Two slits are etched on the square microstrip patch and a split ring defected ground structure(DGS)is etched on the ground,which introduces two radiation nulls and improves the selectivity of filtering antenna.By etching two dumbbell-shaped DGS on the ground plate and loading a circle stub on the feeder,the harmonic was suppressed even up to 12 GHz(4.8 f_(0)).The measured results show that the designed filtering antenna works at 2.34 GHz~2.42 GHz,with two radiation nulls at 2.28 GHz and 2.70 GHz and the reflection coefficients are more than-4 dB from 3 GHz to 12 GHz.