Design of a Novel Ebg Structure and Its Application in Fractal Microstrip Antenna

Abstract

In this paper, a novel electromagnetic bandgap structure (EBGs) is proposed, which is similar to the mushroom-like EBG. By introducing double reverse split rings (RSR) into the square patch, the size of EBG cell is reduced by 30%, and the bandgap achieves bandwidth about 65%. A fractal microstrip antenna is implemented using the EBGs as a ground plane, and the measured results show that the reduction in the surface wave level is remarkable. Compared with the reference antenna at 5 GHz, an approximately 8 dB improvement of the return loss is achieved, and the back lobe is reduced by 10 dB in E plane and 8.73 dB in H plane at the resonant frequency, respectively. The front-back ratios of the antenna have significantly increased from 4.9 GHz to 5.2 GHz.

A new pinwheel meander-perforated plane structure for noise suppression in system-on-package

“…The important parameters of the resonant circuit are resonant frequency (f0) and bandwidth (BW). Those parameters are defined by the following equations [9].…”

Compact meandered‐shape electromagnetic bandgap structure using in a microstrip array antenna application

“…Although the bandgap feature of EBGs can improve the antenna performance, the periodic length of unit‐cells must be a half‐wavelength that makes the difficulty in practical implementation of these structures. So, many investigations have been done to compact the conventional EBGs such as mushroom‐like EBG , UC‐EBG , fork‐like EBG , spiral‐like EBG and reverse split‐ring EBG . In mushroom‐like EBG, consists of periodic patches with vertical Via's connected to the ground plane, the periodic length has been decreased to about 0.1 wavelengths.…”

Dual-Layer Ebg Structures for Low-Profile ``Bent'' Monopole Antennas

“…Here, we choose a dielectric substrate Rohacell 31HF with a permittivity of 1.046, loss tangent tan(δ) = 0.002 (similar to the air) and a height of λ 1.3 GHz /42.7 (for both EBGs). The unit cell (UC) is the mushroom-like patch with a square surface W s × W s [13][14][15][16]. Hence, the parameters (W s, gs, P , da, de, Fig.…”