基于特征模分析的金属环宽带天线设计

Design of Metal Ring Broadband Antenna Based on Characteristic Mode Analysis

基于特征模理论分析方法,设计了一款加载分布电感的金属三角环宽带天线。该天线主要在金属三角环天线的基础上,加载分布电感将三角形环特定的2个模式的谐振频率靠近形成宽带。通过选择合适的馈电位置,采用同轴到微带过渡的结构激励出期望的模式。仿真和测试结果一致,天线的阻抗带宽仿真结果和测试结果分别为57.4%(2.35~4.24 GHz)和51.1%(2.46~4.15 GHz)。同时,在整个阻抗带宽范围内具有较好的全向性和稳定的增益。

A broadband triangular ring metal antenna loaded with distributed inductance is designed based on characteristic mode. The antenna is mainly based on the metal triangular ring antenna, and the distributed inductance is loaded to close the resonance frequencies of two specific modes of the triangular ring to form a broadband. Then, the desired mode is excited by adopting the transition structure from coaxial to microstrip by selecting the appropriate feeding position. The simulation results are consistent with the measured results, and the simulated and measured impedance bandwidth of the antenna is 57.4%(2.35~4.24 GHz) and 51.1%(2.46~4.15 GHz), respectively. Meanwhile, the broadband antenna has good omnidirectional and stable gain over the entire impedance bandwidth range.