Dao-Duc Tan, Truong-Quang Noi, Le-Tuan Tu, Tran-Huy Hung
Faculty of Electrical and Electronic Engineering, PHENIKAA University, Hanoi, Vietnam.
PLoS One. 2025 May 12;20(5):e0321603. doi: 10.1371/journal.pone.0321603. eCollection 2025.
This paper proposes a novel high front-to-back ratio (FBR) metasurface (MS) antenna with single-layer and compact size characteristics. The proposed design consists of a 2 [Formula: see text] 2 unit-cell MS radiating layer, which is capacitively coupled with a directed-fed crossed patch in the same layer. Accordingly, compact design with single-layer MS antenna can be obtained. It is worth noting that the proposed configuration is different from the conventional MS antenna, which is commonly designed with multiple layers, leading to high profile and complicated structure. Finally, a substrate integrated waveguide cavity is employed to improve the FBR of the proposed design. A prototype with overall dimensions of 0.52 [Formula: see text] [Formula: see text] 0.52 [Formula: see text] [Formula: see text] 0.03 [Formula: see text] achieved measured operating bandwidth of about 10.6%. Despite having compact size, the proposed antenna always performs high broadside gain of better than 5.2 dBi and high front-to-back ratio of better than 16 dBi entire the operating bandwidth. These operation characteristic distinguishes the proposed design from the other MS antennas with more complicated structures.
本文提出了一种具有单层和紧凑尺寸特性的新型高前后比（FBR）超表面（MS）天线。所提出的设计由一个2×2单元胞的MS辐射层组成，该辐射层与同一层中的定向馈电交叉贴片电容耦合。因此，可以实现单层MS天线的紧凑设计。值得注意的是，所提出的结构与传统的MS天线不同，传统的MS天线通常采用多层设计，导致外形较高且结构复杂。最后，采用基片集成波导腔来提高所提出设计的前后比。一个总体尺寸为0.52×0.52×0.03的原型实现了约10.6%的实测工作带宽。尽管尺寸紧凑，但所提出的天线在整个工作带宽内始终具有优于5.2 dBi的高宽边增益和优于16 dBi的高前后比。这些工作特性使所提出的设计与其他结构更复杂的MS天线有所区别。
