A millimeter-wave dual-band shared-aperture high-efficiency reflectarray antenna (RA) based on the structure-reuse technique is proposed in this letter, which consists of two sets of elements with full 360° phase compensation ranges. The oblique dipole element excited by the substrate integrated waveguide (SIW) is employed for the lower frequency band. The equivalent metallic waveguide element with the unchanged periodic grid and transverse size is selected for the higher frequency band. To make full use of the radiating aperture and, then, improve the aperture efficiency of the dual-band RA, the SIW-fed dipole cells are used to replace a pair of symmetry walls of the metallic waveguide cell in the x -polarization direction. The measured gains of the proposed RA are 28.7 dBi with the aperture efficiency of 43.59% at 18 GHz and 35.8 dBi with the efficiency of 50.12% at 38 GHz. The simulated and measured results successfully validate the effectiveness of the proposed method in the design of a millimeter-wave dual-band shared-aperture RA.

中文翻译：

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基于结构复用技术的双频共享孔径高效反射阵列天线

本文提出了一种基于结构复用技术的毫米波双频共享孔径高效反射阵列天线（RA），该天线由两组具有360°相位补偿范围的元件组成。由衬底集成波导（SIW）激发的倾斜偶极子元件用于较低频段。对于较高的频带，选择具有不变的周期性栅格和横向尺寸的等效金属波导元件。为了充分利用辐射孔径，然后提高双频RA的孔径效率，使用SIW馈电偶极子电池代替了金属波导元件中的一对对称壁。X -极化方向。拟议RA的测量增益为28.7 dBi，在18 GHz时孔径效率为43.59％，在38 GHz下为35.8 dBi，效率为50.12％。仿真和测量结果成功验证了该方法在毫米波双频共享孔径光阑设计中的有效性。