Influence of the mesh dimensions on optically transparent and active antennas at microwaves

摘要

The paper deals with the study of optically transparent and active square loop coplanar antennas in X-band. Frequency tunability of such antennas is provided by a surface mounted beam-lead varactor with micrometric dimensions, thus non-visible to the naked eye. The influence of the mesh dimensions on sheet resistance (from 0.05 Ω/sq to 0.50 Ω/sq), optical transparency (from 66% to 89%) and microwave performance (reflection coefficient, resonance frequency and gain) is evaluated, compared with those of an opaque counterpart and discussed. Design rules for active mesh antennas will conclude the present study.