基于Minkowski分形CRLH结构的微带漏波天线

将Minkowski分形理论应用于文献中提出的复合左右手传输线结构,使其带宽从2.78～3.30 GHz展宽到2.02～4.53 GHz.对新结构色散特性进行分析,给出色散曲线,确认其为平衡结构,并在此基础上设计了一款微带漏波天线.由于复合左右手单元结构具有左手和右手特性,漏波天线可以分别实现后向辐射和前向辐射,在平衡状态下,消除了平衡点附近的阻带效应,平衡点处的群速不为0,有行波传播,天线可产生横向辐射.仿真和测试结果表明,该文所设计的漏波天线工作频段为2.35～3.20 GHz,相对带宽为30.6％,且能实现从后向到前向连续辐射,克服了传统漏波天线后向辐射角和前向辐射角不连续的缺点.

A Leaky Wave Antenna Based on the Minkowski Fractal Composite Right/Left Handed Structure

The Minkowski fractal theory was applied to the unit cell of composite right/left handed transmission line, and the bandwidth of the designed unit cell is broadened from 2.78 3.30 GHz to 2.02 4.53 GHz. By analyzing the dispersive characteristic of the unit cell, a balanced property is confirmed, and the dispersion diagram is given at the same time, and a leaky wave antenna was designed based on the proposed unit cell. The leaky wave antenna can implement backward radiation and forward radiation respectively due to the left handed and right handed of the CRLH unit structure, and in balanced cases, the gap between left handed and right handed regions can be suppressed, so the traveling wave along the structure occurs and the antenna implements transverse radiation at the balanced point with the group velocity is not zero. Both the simulation and measured results show that the designed leak wave antenna can operate at 2.35 3.20 GHz, the bandwidth is 30.6%, and the antenna can offer continuous radiation from the backward direction to the forward direction, overcoming the shortage of the discontinuity of the traditional leaky wave antenna.