Integrative Transmitarray With Gain-Filtering and Low-Scattering Characteristics
- 15 October 2021
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Antennas and Propagation
- Vol. 70 (3), 1931-1939
- https://doi.org/10.1109/tap.2021.3119044
Abstract
This article presents a design concept of integrative transmitarray antenna (TAA) with gain-filtering and low-scattering characteristics. The integrative TAA element combines a bandpass frequency-selective surface (FSS) element and a square dielectric post with antireflection pyramidal structures (SDPP), achieving the simultaneous control of in-band transmitted waves and out-of-band reflected waves. The FSS element provides the phase-shifting and gain-filtering capabilities around the center operating frequency $f_{0}$ . Meanwhile, the SDPP elements with different heights are utilized to reduce the scattering cross section (SCS) based on the phase cancellation principle. To realize wideband and wide-angle SCS reductions, also to mitigate the in-band radiation degradation, the optimal SDPP arrangement is determined with subarray segmentation. In the experiment, a $42\times42$ -element integrative TAA is designed. Against only the FSS TAA, the simulated results show that loading the optimal SDPP array can realize the scattering reduction in a 10:1 bandwidth up to 60°, including $\sim 5/\sim 10$ dB SCS reductions in 0.5– $1.5~f_{0}$ /1.5– $5~f_{0}$ , respectively. Moreover, the integrative TAA achieves gain-filtering responses with out-of-band suppression levels higher than 20 dB. After fabricating the FSS TAA and the SDPP array by the technologies of standard PCB fabrication and 3-D printing, respectively, the proposed design is further demonstrated by experiments.Funding Information
- Natural Science Foundation of China (U20A20165, 61721001)
- Fundamental Research Funds for the Central Universities (ZYGX2019Z005)
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