Broadband planar slot antenna using a simple single‐layer FSS stopband

Abstract

In this study, the authors propose a simple structure of a new broadband planar slot antenna using a wide single‐layer frequency selective surface (FSS) stopband. The proposed design is realised in two stages. First, the performances of the FSS unit cells are investigated using the finite element method of high‐frequency structure simulator. Besides, the FSS structure considered as a stop‐band filter in the bandwidth false(3−7thinmathspaceGHzfalse), is also validated by computer simulation technology microwave studio. Second, this FSS reflector is combined with a miniaturised wideband planar slot antenna false(29×24×1.57thinmathspacethickmathspacemnormalm3false). The final proposed combination is also designed, optimised, fabricated and validated by measurements. The obtained results show an operating impedance bandwidth of 86.38% false(2.92−7.36thinmathspaceGHzfalse) including the Worldwide interoperability for Microwave Access band, the C band for satellite applications, and the Wireless Local Area Network band. Furthermore, the antenna provides an 8.87thinmathspacedBi measured maximum gain. Compared to the same antenna without FSS, a maximum gain enhancement of 5.53thinmathspacedBi is achieved by the proposed structure. In addition, the back lobes are reduced in the proposed structure by >15thinmathspacedBi, compared to a simple antenna. The total size of the proposed antenna, integrating the FSS, is 0.63λ0×0.63λ0×0.12λ0.

Dual-band dual-truncated R-slot loaded monopole patch antenna using a single-layer bandstop FSS reflector for gain enhancement

“…s H is the distance between the antenna and the FSS reflector, c is the velocity of the light, and F t must be a multiple of 2π to obtain a coherence phase [34,35]. It is expressed as follows:…”

Performance enhancement of an ultra‐wideband antenna using a compact topology optimized single frequency selective surface‐layer as a reflector

“…The FSS reflecting layer is composed of a 7 × 7 FSS array, and the proposed FSS‐backed UWB antenna is illustrated in Figure 14. When using a single FSS layer reflector concept, with our UWB antenna placed above it at a distance D z , the reflected wave from the FSS layer is added to the direct radiation from the antenna itself, leading to a constructive interference, when these two waves are in phase, at the reference plane T, and the total phase ϕ T is described as follow 29 : where …”

Frequency-Selective Surface Stopband Designed with a Genetic Algorithm for Gain Enhancement of a Broadband Monopole Antenna

“…8(c) and 8(d). It was found that the gain of the antenna in the existence of the FSS reflector would be maximum when two components-the round-trip free space propagation phase delay between the antenna and the FSS reflector in the R-plane (𝜑 ) and the reflected back-radiated waves from the antenna toward the FSS (𝜑 )-were added in the phase, which triggered a rise in the constructive interference [19]. The evaluation of the phase at the reference T-plane is depicted by the following equation:…”

“…At this time, a maximum gain of around 5 dBi had been obtained, which improved the impedance bandwidth by only 2.37% at 2.45 GHz and 2% at 5.8 GHz. Other common applications of FSS were illustrated in [16][17][18][19][20][21]. Generally speaking, those reports utilized the classical design methods and proposed fundamental structures, which resulted in certain disadvantages such as low gain enhancement, low impedance bandwidth, high profile, and difficult manufacture.…”