Abstract
The scenario of using a spatially distributed antenna for miniaturized applications is presented in this work. A model of lens antenna with a low profile, compact, and high focusing superstrate, which exquisitely combines the conventional lens and resonant cavity superstrates, is proposed. Based on this model, the parasitic lens superstrate is introduced with high performance and simple configuration. The parasitic lens includes a low dielectric substrate and high resonant parasitic elements. By manipulating the surface currents of parasitic elements concentrating at center region of superstrate, the focusing effect is obtained. A prototype of the parasitic lens antenna was implemented with the source and parasitic superstrate’s lateral dimensions of $0.5\lambda _{0}\times 0.5\lambda _{0}$ and $\lambda _{0}\times \lambda _{0}$ , respectively, and the profile of $0.54\lambda _{0}$ . The peak gain is 10 dBi, corresponding to the enhancement of 5 dB. The measured results perspicuously demonstrate the efficiency of the compact parasitic lens.
Highlights
Due to the avalanche of 5G handset [1]–[6], wearable [7]–[13], and implant wireless devices [14]–[19], the needs for antenna miniaturization are increasingly extended
The spatially distributed antenna delicately manipulates 3D structure to enhance directivity of an excited source [17], [19]. Even though it is a prospective approach, current works have not obtained a significant enhancement. These works all set up parasitic elements in reactive region of sourced antenna to reduce the
Compact, and high focusing superstrate is defined for this scenario
Summary
Due to the avalanche of 5G handset [1]–[6], wearable [7]–[13], and implant wireless devices [14]–[19], the needs for antenna miniaturization are increasingly extended. The gain enhancement method is classified into two kinds, planar and spatial structures The planar structure such as antenna array enhances directivity by adding more radiation elements [2], [3]. This technique significantly broadens the lateral size of antenna which is restricted in some applications such as bio-implant or highly integrated circuit. The spatially distributed antenna delicately manipulates 3D structure to enhance directivity of an excited source [17], [19]. Even though it is a prospective approach, current works have not obtained a significant enhancement. These works all set up parasitic elements in reactive region of sourced antenna to reduce the
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