Abstract
In this paper, a novel explanation on high directive emission of Fabry-Perot resonator antenna with subwavelength metasurface is proposed. Based on image theory and effective constitutive parameter retrieval, the whole Fabry-Perot resonant cavity structure composed of a single-layer metasurface with square ring element and a PEC ground plate can be acted as an effective metamaterial media with very low refractive index (near zero index). According to Snell’s theory, this property can be used to enhance the directive emission. Based on this, with tapered size square ring unitcell, the overlapped bandwidth in which the effective refractive index is near to zero is obtained to widen the bandwidth of high directive emission. It is demonstrated that the maximum of directivity is nearly approaching to 19 dBi, and its 3-dB bandwidth can be improved to 19.5%. A final prototype has been fabricated and measured to validate the proposed design concept. The measured 3-dB gain bandwidth is approximately 20.3% with a peak gain of 17.9 dBi. These results indicate the feasibility of such kind of antenna for broadband and high directivity applications simultaneously.
Highlights
To efficiently manipulating the electromagnetic wavefront[13,14,15,16,17,18]
In this work the metasurface is used as superstrate of FPR to enhance antenna boresight emission, based on above investigation, the general analysis approach to metasurface such as generalized sheet transition condition (GSTC) method[10,11,12] is not suitable for analyzing the metasurface involved in FPRA
In this paper, a novel analysis approach to metasurface used as PRS in FPRA is proposed
Summary
To efficiently manipulating the electromagnetic wavefront[13,14,15,16,17,18]. Compared with three dimension metamaterial, metasurface due to its two dimensional geometry inherently leads to low-profile devices with reduced losses and far less complex design, making them very attractive for many applications. In this work the metasurface is used as superstrate of FPR to enhance antenna boresight emission, based on above investigation, the general analysis approach to metasurface such as generalized sheet transition condition (GSTC) method[10,11,12] is not suitable for analyzing the metasurface involved in FPRA. Under the consideration of mutual coupling, the whole structure of FP cavity composed of metasurface superstrate and ground plate can be acted as an effective metamaterial media[5]. Based on this viewpoint, a broadband FPRA with high directive emission property is designed and presented
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