Partially reflecting surfaces (PRS) with positive reflection phase gradients are investigated for the design of wideband, low-profile electromagnetic band gap (EBG) resonator antennas. Thin single-dielectric-slab PRSs with printed patterns on both sides are proposed to minimize the PRS thickness and to simplify fabrication. Three such surfaces, each with printed dipoles on both sides, have been designed to obtain different positive reflection phase gradients and reflection magnitude levels in the operating frequency bands. These surfaces, and the EBG resonator antennas formed from them, are analyzed theoretically and experimentally to highlight the design compromises involved and to reveal the relationships between the antenna peak gain, gain bandwidth, the reflection profile (i.e., positive phase gradient and magnitude) of the surface and the relative dimensions of dipoles. A small feed antenna, designed to operate in the cavity field environment, provides good impedance matching (|S11| <; -10 dB) across the operating frequency bands of all three EBG resonator antennas. Experimental results confirm the wideband performance of a simple, low-profile EBG resonator antenna. Its PRS thickness is only 1.6 mm, effective bandwidth is 12.6%, measured peak gain is 16.2 dBi at 11.5 GHz and 3 dB gain bandwidth is 15.7%.

The Use of Simple Thin Partially Reflective Surfaces With Positive Reflection Phase Gradients to Design Wideband, Low-Profile EBG Resonator Antennas

This paper presents a novel design of a Fabry-Perot (FP) resonator antenna with a wide gain bandwidth in X band. The bandwidth enhancement of the antenna is attributed to the positive reflection phase gradient of an electromagnetic band gap (EBG) structure, which is constructed by the combination of two complementary frequency selective surfaces (FSSs). To explain well the design procedure and approach, the EBG structure is modeled as an equivalent circuit and analyzed using the Smith Chart. Experimental results show that the antenna possesses a relative 3 dB gain bandwidth of 28%, from 8.6 GHz to 11.4 GHz, with a peak gain of 13.8 dBi. Moreover, the gain bandwidth can be well covered by the impedance bandwidth for the reflection coefficient ( ${\rm S} _{11}$ ) below $-10~{\rm dB}$ from 8.6 GHz to 11.2 GHz.

Wideband Fabry-Perot Resonator Antenna With Two Complementary FSS Layers

A high-gain broadband Fabry-Perot-type antenna is proposed, based on multilayer periodic partially reflective surfaces (PRSs). Three layers of PRSs are employed, consisting of metallic patches printed on thin dielectric substrates and placed in front of a ground plane, forming three open cavities. The antenna performance is based on the reflection characteristics of the PRS array, which are obtained using periodic analysis. An equivalent circuit approach is presented for the design of the multilayer PRSs showing very good agreement with full-wave analysis. The geometry has been optimized using full-wave simulations (CST Microwave Studio). An antenna of around 20-dBi gain at an operating frequency of 14.5 GHz is obtained with a 3-dB bandwidth of about 15%, outperforming earlier antenna designs based on two-layer PRS. A prototype has been fabricated and tested, validating the simulation results.

/pdf/multilayer-partially-reflective-surfaces-for-broadband-fabry-5fpli3ex4e.pdf

Multilayer Partially Reflective Surfaces for Broadband Fabry-Perot Cavity Antennas

A shared-surface dual-band antenna is proposed for 5G operation using characteristic mode analysis (CMA). The surface is the integration of a metasurface at the ${S}$ -band and a partially reflective surface (PRS) at the Ka -band. The resonant mode of the metasurface is excited by a microstrip-fed slot, and the PRS with a pair of substrate-integrated waveguide (SIW)-fed slots are employed to form a Fabry–Perot resonator antenna (FPRA). Measurements realized on a physical prototype of the antenna show a 10 dB impedance bandwidth of 23.45% and 9.76% and a realized gain that varies from 7.27 to 10.44 dBi and from 11.8 to 14.6 dBi, over the ${S}$ -band (3.2–4.05 GHz) and the Ka -band (26.8–29.55 GHz), respectively.

Shared-Surface Dual-Band Antenna for 5G Applications

A novel method is presented to design single-feed high-gain EBG resonator antennas (ERAs) with significantly wider bandwidths. Dielectric contrast is introduced to 1-D EBG superstructures composed of unprinted dielectric slabs, and the thicknesses of each of these slabs is optimized to achieve a wideband defect mode in a unit-cell model. Next, antennas are designed and their superstructure areas are truncated to increase the antenna bandwidth and aperture efficiency while decreasing antenna footprint. We demonstrate that a small superstructure area increases the 3-dB bandwidth of ERAs significantly. A prototype ERA designed with a single feed and superstructure area as small as ${\hbox {1.5}} \lambda_0 \times {\hbox {1.5}} \lambda_0$ has a measured 3-dB directivity bandwidth of 22% at a peak gain of 18.2 dBi. This prototype antenna was made out of three slabs of different dielectric constants, two of them touching each other. This prototype demonstrates more than 85% reduction in the ERA footprint alongside a drastic improvement in bandwidth over the 3%–4% measured bandwidth of the classical single-feed ERAs with unprinted slabs.

Wideband High-Gain EBG Resonator Antennas With Small Footprints and All-Dielectric Superstructures

In this letter, a new electromagnetic band gap (EBG) structure is proposed. It is constructed by double-layer frequency selective surfaces (FSS) periodically arranged in the z-direction. A periodicity defect is introduced in the middle of the structure. Resulted EBG structure with defect is composed of two double-layer FSS with wavelength spacing between them. Due to the presence of the defect, an allowed frequency band is created within the EBG structure band gap. The width of the formed defect band is increased compared to that of classical EBG structures with defect. The new material composed of a double-layer FSS is applied in the design of a resonator antenna. The resonator, formed between the double-layer FSS and a metallic ground, is fed by a patch source placed at the proximity of the ground. The antenna bandwidth is significantly improved by virtue of employing the new structure of wider allowed band. The participation of each FSS layer in the antenna bandwidth enhancement is described. An antenna application at 5 GHz is shown.

EBG Structure With Wide Defect Band for Broadband Cavity Antenna Applications

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

L. Moustafa

Author Tools

Chat about Author

Papers

EBG Structure With Wide Defect Band for Broadband Cavity Antenna Applications