Long Slot mmWave Low-SLL Periodic-Modulated Leaky-Wave Antenna Based on Empty SIW
Long Slot mmWave Low-SLL Periodic-Modulated Leaky-Wave Antenna Based on Empty SIW
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DOI：
10.1109/tap.2021.3137183
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发表时间：
2022-03-01
影响因子：
5.7
通讯作者：
Jackson, David R.
中科院分区：
文献类型：
--
作者：
Araghi, Ali;Khalily, Mohsen;Jackson, David R.
本文将空基片集成波导（ESIW）技术应用于长缝隙漏波天线的设计。首先，提出了一种均匀孔径结构，并研究了其在形成波束方面的局限性。然后，采用正弦曲线修改导波结构的几何形状，将缝隙分成若干段，形成周期性的缝隙。在此基础上，提出了一种对ESIW内部导波进行调节的方法。为此，调制函数推导出同时确定的局部振幅和段长度的物理正弦曲线在每个单独的点上的结构。这导致操纵跨越孔径的相位常数（β）和泄漏率（α），这最终控制所构造的波束的倾斜角和旁瓣电平（SLL）。狭缝位于ESIW宽壁的中心线上，以减少交叉极化。该结构被设计为在35 GHz下工作，SLL = -30 dB，后倾角θ（m）= -20度。最后，提出的LWA进行了模拟和制造的设计进行了测量。一个很好的协议之间观察到的理论，模拟和测量的天线性能。
In this article, empty substrate integrated waveguides (ESIW) technology is applied to design long slot leaky-wave antennas (LWAs). First, a uniform-aperture structure is presented and its limitations on forming the beam are studied. Then, a sinusoidal curve is employed to modify the geometry of guided-wave structure which divides the slot into a number of segments, making a periodic aperture. After that, a method is proposed to regulate the guided waves inside the ESIW. To this end, a modulation function is derived to simultaneously determine the local amplitude and segment length of the physical sinusoidal curve at each individual points on the structure. This results in manipulating the phase constant (beta) and leakage rate (alpha) across the aperture which ultimately controls both the tilt angle and sidelobe-level (SLL) of the constructed beam. The slot is placed on the centerline of the broad wall of the ESIW to reduce the cross polarization. The structure is designed to operate at 35 GHz with SLL = -30 dB and a backward tilt angle of theta(m) = -20 degrees . Finally, the proposed LWA is simulated and a fabricated design is measured. A good agreement is observed between the theoretical, simulated, and measured performance of the antenna.