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Electromagnetic Band Gap Slot Antennas
Electromagnetic Band Gap Structure
Electromagnetic Band Gap Slot Antenna System
Electromagnetic Waves And Antennas

Published online 2013 Sep 19. doi: 10.1155/2013/917965

PMID: 24170984

This article has been cited by other articles in PMC.

Abstract

A modified electromagnetic-bandgap (M-EBG) structure and its application to planar monopole ultra-wideband (UWB) antenna are presented. The proposed M-EBG which comprises two strip patch and an edge-located via can perform dual notched bands. By properly designing and placing strip patch near the feedline, the proposed M-EBG not only possesses a simple structure and compact size but also exhibits good band rejection. Moreover, it is easy to tune the dual notched bands by altering the dimensions of the M-EBG. A demonstration antenna with dual band-notched characteristics is designed and fabricated to validate the proposed method. The results show that the proposed antenna can satisfy the requirements of VSWR < 2 over UWB 3.1–10.6 GHz, except for the rejected bands of the world interoperability for microwave access (WiMAX) and the wireless local area network (WLAN) at 3.5 GHz and 5.5 GHz, respectively.

1. Introduction

A Miniaturized Ultra Wideband Slot Antenna with. Band Notched Characteristic. Subbarao., Dr.S.Raghavan. Moments based IE3D Electromagnetic solver. The antenna has stable Omni directional pattern in. Gap between ground plane and signal strip width. Electromagnetic Band Gap (EBG) circularly polarized slot-patch antenna in multilayered configuration. The operating frequency band can be controlled via the disk radius and adjusting the slit lengths. An arrangement combining the circular slot-patch antenna design and feeding sources included are considered is necessary. In this paper, we introduce a novel design for a high‐directivity Electromagnetic Band Gap (EBG) resonator antenna that utilizes a frequency‐selective surface (FSS) superstrate. The above type of superstrate is proposed as an alternative to an EBG type of dielectric superstrate—investigated previously by the authors—to reduce its height and facilitate the fabrication process. A one-dimensional electromagnetic band gap (EBG) waveguide phase shifter electronically scanned array (ESA) horn antenna utilizes a linear array of EBG waveguide phase shifters for scanning.

UWB technology has received great attentions from both the academic and the industrial sectors since the US Federal Communications Commission (FCC) authorized the unlicensed use of UWB from 3.1 to 10.6 GHz for commercial communication purposes. As an important component of UWB system, UWB antenna has attracted increasing attentions. A number of UWB antennas with different geometries have been experimentally characterized [1–4]. Among them, planar monopole antennas are considered as good candidates for UWB applications due to their attractive merits, such as large impedance bandwidth, easy fabrication, and omnidirectional radiation pattern [5].

Many kinds of UWB planar antennas are designed to satisfy the requirements of UWB operation. However, in practical applications, some other existing narrowband services that already occupy frequencies in the UWB may cause potential interference, for instance, WiMAX for some European and Asian countries (3.3–3.6 GHz) and WLAN for IEEE802.11a in the USA (5.15–5.35 GHz and 5.725–5.825 GHz). Furthermore, C-band system (3.7–4.2 GHz) and X-band satellite communication services from 7.25 to 8.395 GHz (downlink: 7.25–7.745 GHz, uplink: 7.9–8.395 GHz) also operate in the UWB [6, 7]. So, it is necessary to design UWB antennas with multiband filtering functionality to protect the UWB system from any interference among them. Various UWB antennas with band-notched characteristics to alleviate potential electromagnetic interference have been reported recently [8–18]. Usually, there are two main methods used in the design of notched band. The conventional method focuses on cutting various slots in the patch/ground plane, such as L-shaped slot [8], open-ended slot [9], semicircular slots [10], U-shaped slot [11], square-shaped slot [11], Ω-shaped slot [13], π-shaped slot [14], fractal slot [15], and complementary edge-coupled SRR-shaped slot [16]. Another effective method is loading diverse parasitic elements on the antennas, such as L-shaped or ring-shaped branches near ground [17, 18], various strips near patch [19], and split-ring resonators (SRRs) or stepped-impedance resonators (SIRs) near feedline [20, 21]. Generally, one slot/parasitic element can only generate one notched band and fails to meet the requirements of avoiding multiple interferences caused by the coexisting systems. In order to design dual/multinotched UWB antenna, multielements are commonly needed. Although these methods can design UWB antennas with high performances, they still unavoidably exhibit some inherent shortcomings in practical applications, such as bringing occupation of too large space on the antenna as well as strong coupling between band notched structures. Therefore, implementing those approaches accordingly caused complicated design. Under the circumstances, the mushroom-style EBG structures are introduced to be another solution to design UWB antennas with multiple suitable band notches and compact sizes [22].

Recently, EBG structures have been implemented in different applications because they have characteristics of surface wave reduction, eliminating spurious response [23, 24]. Various types of these structures have been used in the design of UWB antennas with band-notched characteristics [25–30]. In [28], EBG structure is applied to a UWB wide-slot antenna

Electromagnetic Band Gap Slot Antenna