A Circuit Model to a Directive Triangular EBG Antenna (original) (raw)

Design of a directive and matched antenna with a planar EBG structure

IEEE Antennas and Propagation Society Symposium, 2004., 2004

The purpose of this presentation is to propose a method to design a directive and matched antenna with a planar Electromagnetic Band Gap (EBG) structure. The EBG structure of our example consist on metallic wires. This study use the FDTD method and analytical formulas.

Analysis and Design of a Cylindrical EBG Based Directive Antenna

In this paper, a cylindrical electromagnetic bandgap (CEBG) structure composed of infinite metallic wires is analyzed, designed and used as a model to develop a new reconfigurable directive antenna. This structure is circularly and radially periodic, and it is excited at its center using an omnidirectional source. The analysis is based on calculating the transmission and reflection coefficients of a single cylindrical frequency selective surface (FSS) and then, considering only the fundamental mode interaction, deducing the frequency response of the CEBG structure composed of multiple cylindrical FSSs. For this structure, new analytical formulas are derived, and their accuracy is assessed compared to those obtained by the finite-difference time-domain method. As in rectangularly periodic structure case, the frequency response of the CEBG structure exhibits pass-bands and bandgaps, and it is possible to obtain directive beams by introducing defects in the periodic structure. Using this concept, a new antenna was developed to obtain a controllable directive beam. An antenna prototype, without control, was designed, fabricated, and tested. An excellent agreement was obtained between theory and experiment for both return loss and radiation patterns.

Parametric Performance Analysis of Patch Antenna Using EBG Substrate

International Journal of Wireless & Mobile Networks, 2012

In recent years, microstrip antennas become very popular because of their interesting advantages of low cost, low profile, light weight, easy fabrication and ease of analysis. Electromagnetic Band Gap (EBG) substrate is used as a part of antenna structure to improve the performance of the patch antenna. Usually, the performance of a patch antenna depends on the parameters such as Return Loss (RL), Bandwidth (BW), Gain, and Directivity. In this paper, we propose a rectangular microstrip patch antenna with EBG substrates of different EBG patch width and analysis the performance of the proposed antenna compare with a conventional patch antenna using the same physical dimension using HFSS simulator. Here we show four analyses of our designed antenna and compare with the conventional microstip patch antenna. Comparison results show that, the performances of our proposed schemes are better comparing the conventional patch antenna.

Metallic EBG structures for directive antennas using rectangular, cylindrical and elliptical shapes

IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), 2005

This paper presents different designs of directive antennas using Electromagnetic Band Gap (EBG) structures. The EBGs consist of periodic structures of metallic wires. In this study, periodic structures in cartesian, cylindrical and elliptical coordinates are considered. Experimental results of antennas using these different geometries and a monopole as an excitation source are presented, and their performances are compared.

Effect of EBG Structures on the Field Pattern of Patch Antennas

International Journal of Electromagnetics ( IJEL )

The incorporation of number of unit cells in EBG arrangement produces two major side effects on the performance of patch antenna. First one is parasitic loading, this causes multi resonance in antenna hence obtains some enhancement in antenna band width. Second one is cavity effect, this reflects some of energy from EBG toward antenna which results in reducing bandwidth. Present paper, rectangular microstrip patch antenna is surrounded by number of EBG rows is designed; and the results of proposed antenna with a conventional patch antenna is presented comparatively.

Comparative Analysis of EBG Structure and its Application on Microstrip Patch Antenna

2016

In this paper we have presented atwo new EBG structure with its radiation pattern, S-parameter, VSWR and Gain respectively. Also this new EBG structure is compared with different Mushroom-like EBG structure. Both of these EBG structures have a substrate with same size and same material and also there is no connecting via between its ground plane and patch, contrary to Mushroom-Like EBG structure. At the end, it was resulted that the gain of antenna has increased noticeably by using the EBG structures.

Design Anaysis of Patch Antenna Using Ebg Structure

Journal of emerging technologies and innovative research, 2018

Technology has become the most vital part of the daily life. With the development of antenna technology, the wireless devices became more capable of providing the services like Wi-BAN, point-to-point bridge, hotspot, public wireless, Wi-MAX, WLAN, Wi-Fi and wireless video systems. In this research work, we have been demonstrating the design composition of patch antenna backed by the electromagnetic band gap (EBG) structure to be operated at 4.8 GHz of resonant frequency. The dispersion diagram provides the aid to determine the bandgap characteristics of EBG structure. To cover the required band gap of 4.8 GHz, the dimensions of EBG structure are tuned and adjusted. The EBG was analyzed and implemented on coaxial feed microstrip patch antenna in order to determine the S11 parameter performances. Better results have been attained at a distance of -10 mm between the patch antenna and EBG in comparison to other varied distances. Index Terms Dispersion curve, Electromagnetic Band Gap (EB...

Ebg-Antenna Analysis : Unification of Frequency and Angular Dependencies

In this paper, we present an original method to study planar EBG based antennas. From this method, which unifies the frequency and angular dependencies of the EBG structure, we obtain an analytical expression of the directivity of the structure versus frequency. To our knowledge, these results concerning EBG structures have never been presented.

Influence of EBG Structures on the Far-Field Pattern of Patch Antennas

Radioengineering

In this paper, the influence of the EBG structures on the far-field pattern of patch antennas is investigated. As a reference model, a conventional rectangular patch antenna on a high-permittivity substrate is used. The reference model is consequently equipped by an EBG substrate (instead of the conventional one), and by an EBG cover (so called EBG superstrate). The changes in the farfield radiation patterns are discussed. In the second part of the paper, the substrate is perturbed by two different EBG structures designed for the coverage of two operation bands.

IMPROVING THE PERFORMANCE PARAMETERS OF MICROSTRIP PATCH ANTENNA BY USING EBG SUBSTRATE

The objective of this paper is to analyze the performance of electromagnetic band gap (EBG) antenna for base station applications through simulation. The proposed analysis is carried out using the high frequency structure simulator (HFSS). In our method, to overcome several intrinsic limitations of patch antennas such as constrict bandwidth, low gain, excitation of surface waves, the EBG concept is applied. The patch antenna and patch antenna surrounded by the EBG cells are characterized in terms of return loss and radiation pattern in an anechoic chamber.