Design Methodology for a Miniaturized Frequency Selective Surface Using Lumped Reactive Components

TLDR

The paper presents a design methodology for a miniaturized frequency selective surface using lumped reactive components. The design employs capacitive and inductive lumped elements in metallic patches to form current loops, with full‑field analysis evaluating component loss and oblique incidence effects. The resonant frequency is primarily determined by the lumped component values, only weakly by their spacing, and is insensitive to periodicity, as demonstrated by full‑field predictions and measurements of a unit‑cell periodicity of 1/36.

Abstract

The design methodology is described for a miniaturized frequency selective surface (FSS) using lumped reactive components. Capacitive and inductive elements are utilized in metallic patches to create current loops similar to that observed in bandpass aperture type FSS. It is shown that the resonant frequency of the FSS is controlled mainly by the values of the lumped components and to a lesser extent by the distance between the components. It is insensitive to the periodicity. Issues such as the effects of component loss and oblique incidence are reported using full field predictions. Measurements are shown for an FSS with unit cell periodicity of ¿/36.