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为提高通信系统的通信容量,设计了一种基于基片集成波导(SIW)结构的双圆极化天线,该天线由耦合器和两个谐振缝隙天线构成。文章基于空腔模型研究,耦合器采用SIW结构作为耦合部分,在分析缝隙天线及阵列天线理论基础上,引入两个谐振缝隙天线,每个谐振缝隙天线由6个与电磁波传播方向成-45°或者45°的缝隙天线单元构成,在传输线模型理论中,天线输入端口采用共面波导(CPW)的转换结构是必不可少的。该天线可以根据它的应用需求来调整工作极化方式,可以实现左旋圆极化(LHCP)或者右旋圆极化(RHLP)。通过测试加工后的天线验证仿真数据表明,该天线的相对带宽超过5.6%(22.1GHz~23.4GHz),在此频率范围内,轴比小于3dB,输入端的隔离度也超过了22dB,可实现增益12.2dB。
In order to improve the communication capacity of the communication system, a double circular polarization antenna based on SIW structure is proposed. The antenna consists of a coupler and two resonant slot antennas. Based on the cavity model, the coupler uses the SIW structure as the coupling part. Based on the analysis of the slot antenna and the array antenna theory, two resonant slot antennas are introduced. Each resonant slot antenna consists of 6 antennas that are oriented at -45 ° Or 45 ° slot antenna unit. In the transmission line model theory, it is essential that the antenna input port adopts the CPW conversion structure. The antenna can be adjusted according to its application needs working polarization, can achieve left-handed circular polarization (LHCP) or right-handed circular polarization (RHLP). Passing the test and processing the antenna to verify the simulation data shows that the relative bandwidth of the antenna exceeds 5.6% (22.1GHz ~ 23.4GHz). In this frequency range, the axial ratio is less than 3dB and the input isolation is more than 22dB, which can achieve the gain 12.2dB.