We propose a uniform backfire-to-endfire leaky-wave antenna (LWA) based on a topological one-way waveguide under external bias magnetic field. We systematically analyze the dispersion, showing that the proposed structure supports leaky mode arisen from total internal reflection. By means of tuning frequency or magnetic field, we obtain fixed-bias frequency and fixed-frequency bias LWA with continuous beam scanning from backward, broadside to forward direction. More importantly, we, for the first time, demonstrate that this proposed LWA shows mechanical tunability, allowing us to manipulate the radiation direction from backward, broadside to forward direction by mechanically tuning the air layer thickness. The simulated results show that our system exhibits super low 3dB beam width, high radiation efficiency as well as high antenna gain. Being provided such multiple controlled (especially mechanically) beam scanning manners, the present LWA paves an advanced approach for continuous beam scanning, holding a great potential for applications in modern communication and radar system.

中文翻译：

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基于拓扑单向波导的机械扫描漏波天线

我们提出了一种在外部偏置磁场下基于拓扑单向波导的均匀逆火-端火泄漏波天线（LWA）。我们系统地分析了色散，表明所提出的结构支持全内反射引起的泄漏模式。通过调谐频率或磁场，通过从后向，从宽边到正向的连续光束扫描，获得固定偏置频率和固定频率偏置LWA。更重要的是，我们首次证明了所提出的LWA具有机械可调性，允许我们通过机械地调整空气层的厚度来控制从后向，宽边到正向的辐射方向。仿真结果表明，我们的系统具有超低的3dB波束宽度，高辐射效率以及高天线增益。