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A multilayer waveguide-based antenna radiator is proposed to achieve a wide operational bandwidth of high gain and high efficiency in a compact size. It is a $2\times 2$ array, consisting of a feeding waveguide, a matching cavity, and a radiating aperture. The proposed design provides sufficient freedom for the radiator to achieve broadband impedance matching. In order to improve radiation efficiency and avoid drawbacks from the traditional machining techniques, a binder-jetting process using metallic particles is adopted to realize the relatively complicated structure. This 3-D metal-direct-printing technique is competent to fabricate waveguide-based structures with high precision. Experimental results are favorably compared to the results of the fabrication by the machining technique. The measured relative bandwidth with VSWR $\leq1.5$ is 23.7% (13.0–16.5 GHz). A high efficiency of 90% is obtained at the center frequency, and more than 80% efficiency can be maintained over a 2.3-GHz bandwidth. This paper shows that the binder-jetting printing technique is a promising manufacturing approach to realizing high-performance waveguide-based antennas and microwave components. [ABSTRACT FROM AUTHOR]

This paper proposes a waveguide-stripline series–corporate hybrid feed technique to ease the feed-network design for dual-polarized antenna arrays. The hybrid feed network consists of a stripline series feed network and a waveguide-stripline corporate feed network, incorporating both of their advantages in one application. Furthermore, the design can efficiently simplify the manufacturing and packaging process without any bonding postprocess. The proposed technique is realized on an $8 \times 8$ dual-polarized antenna array, and the expected performances are verified by measurement. Experimental results show that the antenna array can operate in a wide bandwidth of 13.2% with more than 40 dB isolation for dual polarization. Cross polarizations at the center frequency of 15.2 GHz are below −27 dB, and the achievable aperture efficiency is 80% for both the polarizations. This hybrid feed approach can be considered as a promising solution for efficient feed-network applications. [ABSTRACT FROM PUBLISHER]