Analysis and design of triple-band high-impedance surface absorber with periodic diversified impedance

Abstract

In this paper, a triple-band planar absorber with high-impedance surface (HIS) is designed and fabricated. The absorber structure is composed of polyurethane foam sandwiched between a lossy sheet of frequency selective surfaces (FSS) and a perfect electric conductor. The lossy FSS possesses different resistances in a periodic composite unit as compared with typical HIS absorber. Losses in the FSS are introduced by printing the periodic composite square ring pattern on blank stickers using various resistive inks. Physical mechanism of the HIS absorbers is analyzed by equivalent circuit model and electric field distribution studies. The proposed absorber with periodic composite units offers superimposed triple-band absorption as compared with that of the single units having single- or dual-band absorption characteristics. The reflection loss measurements show that the 90% absorption bandwidth of the HIS absorber is increased by 42% by the proposed composite periodic units.

Analysis of Efficiencies for Multiple-Input Multiple-Output Wireless Power Transfer Systems

“…3(b), we show R L2,opt (= R L3,opt ) as a function of v and h. When the distance between the Tx and Rx loops becomes large, R L,opt may become too small to be realized. This can be handled with a multi-turn Rx loop or an additional feeding loop or matching circuit [8][9][10] depending on the system requirements. 4 shows the coupling coefficients k 21 , k 31 , and k 32 depending on the distances v and h based on the same system configuration as described in Fig.…”

An ultrathin microwave metamaterial absorber with enhanced bandwidth and angular stability

“…Holloway et al reported the reflection and transmission properties of metafilm [7], in which it is proposed that the transmission and reflection properties can be controlled by changing the electric and magnetic polarizability. HIS, which consists of an array of frequency selective surfaces (FSS) over grounded dielectric layer is a good candidate for designing narrowband or wideband absorbers by introducing loss either to dielectric layer [6] or FSS layer [8,9], respectively. The narrowband absorbers designed by exploiting the dielectric loss of HIS layer are referred to as perfect metamaterial absorbers [6].…”

Design of Wideband Thin Absorber Using Resistive Cross-Shaped Surface Structures

“…이 방법도 사용된 λ/4 두께의 주파수 의존성으로 대역폭 에 제한이 따른다. 이의 극복을 위해, 순수저항성 면 구조 의 적절한 개선을 통해 λ/4 두께의 주파수 의존성을 상 쇄할 수 있는 리액턴스를 부가함으로써 광대역화 할 수 있는 연구가 진행되었다 [3]～ [5] . 이른바 reactive screen은 십 자모양의 간단한 구조로 구현될 수 있으며, 넓은 흡수율 대역폭을 가질 수 있다 [6] .…”