ABSTRACT In this paper, a novel Single-layer Substrate Integrated Waveguide (SIW) H-plane horn antenna with equal beamwidths in the principal planes is proposed. To equalize radiation patterns in E- and H-plane, descending tapered-length triangular grated transitions are used at the aperture of the horn. Then, an elliptical dielectric slab with ascending tapered-diameter air holes is utilized to improve the gain and bandwidth of the antenna. Its radiation patterns in E- and H-plane are nearly equal and the H-plane planar horn antenna works as a 3D pyramidal horn. The antenna has small dimensions of 76.62 mm × 22.9 mm × 3.175 mm (5.62λ0 × 1.68λ0 × 0.23λ0). It covers the frequency range of 17 GHz-26 GHz with S11 < −10 dB, i.e., 41% bandwidth. The gain of the antenna is 12.6 dBi ± 2.5 dBi over the operational bandwidth. The proposed horn antenna is a suitable feed for small symmetric reflectors with negligible blockage and respectable efficiency. To validate the simulation results, the antenna is fabricated and tested. There is a good agreement between the simulation and measurement results.

中文翻译：

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具有几乎相等的 E 和 H 平面波束宽度的单层 SIW H 平面喇叭天线

摘要 在本文中，提出了一种新的单层基板集成波导 (SIW) H 平面喇叭天线，在主平面上具有相等的波束宽度。为了均衡 E 平面和 H 平面中的辐射方向图，在喇叭的孔径处使用了递减的锥形长度三角形光栅过渡。然后，利用具有递增锥形直径气孔的椭圆介质板来提高天线的增益和带宽。它在 E 平面和 H 平面中的辐射模式几乎相等，并且 H 平面平面喇叭天线用作 3D 金字塔喇叭。天线尺寸小，为 76.62 mm × 22.9 mm × 3.175 mm (5.62λ0 × 1.68λ0 × 0.23λ0)。它覆盖了 17 GHz-26 GHz 的频率范围，S11 < -10 dB，即 41% 的带宽。天线的增益在操作带宽上为 12.6 dBi ± 2.5 dBi。所提出的喇叭天线是一种适用于小型对称反射器的馈电，具有可忽略的阻塞和可观的效率。为了验证仿真结果，制作并测试了天线。模拟和测量结果之间有很好的一致性。