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Miniaturized and Dual-stopband FSS with Large Band Ratio
- Citation Author(s):
-
YiLi
- Submitted by:
- Yi Li
- Last updated:
- Wed, 04/24/2024 - 04:58
- DOI:
- 10.21227/8rgc-ym59
- License:
38 Views- Categories:
- Keywords:
Abstract
In this letter, a miniaturized and dual-stopband frequency selective surface(FSS) with a large band ratio(BR) is presented. This structure is composed of one metal layer and two dielectric layers and has excellent miniaturization characteristics. In particular, the unit size is only 0.054λ0 and the thickness is only 0.014λ0, where λ0 is the wavelength corresponding to the first resonant frequency. And there is only one layer of metal layer, which greatly reduces the processing complexity and cost. The measurement results show that for TE and TM polarization, the center frequencies of the two stop bands are 2.03 GHz and 18.98 GHz corresponding to a BR of 9.35. It can be used as a spatial dual frequency filter with large frequency band separation. In addition, the proposed structure also possesses advantages such as wideband response, good polarization stability, and high angle stability. The simulation results are in good agreement with the measured results.
The proposed FSS structure is a single layer structure with a thin dielectric layer above and below the main metal layer in the center. This FSS is assembled by a parallel tightly arranged along the x and y directions, which provides a very good polarization stability. The structure of each unit is shown in the figure, which mainly consists of an outer metal ring and an inner center-symmetric structure. The centrosymmetry of the inner layer is a combination of a group of concentric rings and an improved Swastika. This FSS uses FR-4 with a relative permittivity=4.3 and loss tangent=0.025 as the substrate, and the metal layer is made of copper.
