Yuki Kawakami

Mutual coupling reduction effects of EBG structure located on cylinder surface

EBG (Electromagnetic Band-Gap) structures composed of metal patches arranged at narrow intervals have been studied to apply to microwave components and antennas [1][2]. The EBG structures have the frequency-band-rejection characteristics and it can reduce the undesired radiation of electromagnetic waves [3]. In general, the EBG structure is made on the flat ground plane, and is not examined the design method when put on the curved surface. This paper describes the mutual coupling reduction effects of EBG structures located on cylindrical surface.

Low-profile design of meta-surface by considering filtering characteristics of FSS

A FSS (Frequency Selective Surface) is composed of metal patches arranged in narrow intervals, and has frequency-band-rejection and frequency-band-pass characteristics. It is known that the FSS with the ground plane has PMC (Perfect Magnetic Conductor) characteristics in a specific frequency band. The surface is referred to as a meta-surface and it can control the phase of the wave which is reflected at the surface. This paper proposes a design method to realize a low-profile meta-surface. In the proposed method, the FSS which has low-pass or high-pass filtering characteristics is utilized. The effects of the filtering characteristics of a FSS on PMC characteristics of a meta-surface are described. Based on the calculated results, it is confirmed that the meta-surface can be obtained by using the FSS. In addition, it is found that the thinner and more wideband meta-surface can be achieved by using the FSS which has low-pass filtering characteristics.

Reflection Characteristics of Finite EBG Structures on Finite Ground Plane

In this paper, we take up mushroom type EBG structures and clarify the frequency-band-rejection characteristics of the finite EBG structures on the finite ground plane, and we also compare that with the infinite EBG structures and the semi-infinite EBG structures. Here, we analyze the reflection characteristics of a normal incidence plane wave.