基于Minkowski分形CRLH结构的微带漏波天线

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

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2.78～3.30GHz展宽到2.02～4.53GHz。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2.35～3.20GHz,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。

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 sup- pressed, so the traveling wave along the structure occurs and the antenna implements transverse radiation at the bal- anced 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.