Small broadband circularly polarized antenna using artificial magnetic conductor

The invention discloses a small broadband circularly polarized antenna using an artificial magnetic conductor. The antenna mainly comprises three parts: an artificial magnetic conductor (AMC) structure, a dielectric substrate layer and a circularly polarized radiation patch unit. The antenna designed based on the method of the present invention can be fabricated by a printed circuit board processand has the advantages of low profile and miniaturization. In overall consideration of an impedance bandwidth with a standing wave less than 10dB, 3dB axial ratio bandwidth and 3dB gain bandwidth, theantenna can realize broadband circularly polarized radiation with a relative bandwidth greater than 10%. 本发明公开了种采用人工磁导体的小型宽带圆极化天线，天线主要包括三个部分：人工磁导体（Artificial Magnetic Conductor，AMC）结构、介质基板层以及圆极化辐射贴片单元。基于本发明的方法所设计的天线可以采用印刷电路板工艺制作，并具有低剖面与小型化的优点。综合考虑驻波小于-10dB的阻抗带宽、3dB轴比带宽以及3dB增益带宽，该天线能够实现相对带宽大于10%的宽带圆极化辐射。