In a first part of this article, we present the method based on the reflection phase diagram for the identification of the EBG (electromagnetic band gap) structures. The procedure consists to plot the diagram of phase of the wave reflected by EBG structure excited by an incident wave, in the simplest case, plane and normal upon the structure. The forbidden band corresponds to the frequency band where the phase of the reflected wave is equal to 0plusmn45deg, criterion of Sievenpiper, or to 90plusmn45deg, criterion of Rahmat-Samii. In the filtered frequency band, the structure behaves as a magnetic conductor : a High-impedance surface. The EBG structure studied and designed is a Mushroom-like (D. Sievenpiper et al., 1999). The performances of this structure are modelled using the HFSS code. In the second part, we illustrate the application aimed by the design of this structure.
"The applications of EBG structures in antenna designs have become a thrilling topic for antenna engineering . It's a matter of the technology of EBG structure , a new technology for the improvement of the performances of antenna, applicable on a frequential spectrum extremely wide covered from the acoustic until to the optical frequencies . Besides that, EBG structures, also known as photonic crystals , are also used to improve the antenna performance -. "
[Show abstract][Hide abstract] ABSTRACT: This paper presents a sector antenna for base station of mobile phone using microstrip antenna (MSA) array with curved woodpile Electromagnetic Band Gap (EBG). The advantages of this proposed antenna are easy fabrication and installation, high gain, and light weight. Moreover, it provides a fan-shaped radiation pattern , a main beam having a narrow beam width in the vertical direction and a wider beamwidth in the horizontal direction, which are appropriate for mobile phone base station. The half-power beamwidths in the H-plane and E-plane are 37.4 and 8.7 degrees , respectively. The paper also presents the design procedures of a 1 × 8 array antenna using MSAs associated with U-shaped reflector for decreasing their back and side lobes. A Computer Simulation Technology (CST) software has been used to compute the reflection coefficient (S11), radiation patterns, and gain of this antenna. The bandwidth, at S11 (−10 dB), is enough, which can be well utilized for 3G base station, with a gain 20.84 dB.
Open Journal of Antennas and Propagation 03/2014; 2(01):1-8. DOI:10.4236/ojapr.2014.21001
"EBG Structure designed in this study is a Mushroom-like . Based on the Reflection Phase Method , the EBG structure is designed on a dielectric substrate of permittivity 8 . 9 r = ε and thickness h-ebg = 3.175mm with the following optimal parameters : The size of elementary cell 12mmx12mm including a 11.58mmx11.58mm of patch. "
[Show abstract][Hide abstract] ABSTRACT: 1. Abstract The aim of this study is to miniaturize a printed antenna by using Electromagnetic Band Gap (EBG) structures. In a first part, we describe the geometry and the electromagnetic characteristics of the printed antenna. We illustrate in the second part the solution suggested for this miniaturization. The procedure consists to design an EBG structure which works inside the band-width of the antenna, and employs this structure as reflector ground plane of the antenna. In the band gap of the structure, this plane behaves like an Artificial Magnetic Conductor. In the third part, we give the results of simulations and measurements obtained.
[Show abstract][Hide abstract] ABSTRACT: This paper presents a high-gain antenna using microstrip antenna (MSA) with triangular Electromagnetic Band Gap (EBG) cavity for mobile base station. The advantages of this proposed antenna arelight weight, easy fabrication and installation. Moreover, it provides the moderately high gain compare to the other antennas in the cellular phone system at present. The paper also presents the procedures of the 3-element MSA and triangular EBG cavity design. A Computer Simulation Technology (CST) software has been used to compute the return loss, VSWR, radiation pattern, and gain of the antenna. The azimuth patterns of the proposed antenna can cover 360 degree of user's areas according to our requirement. The bandwidth, at S 11 (−10 dB), is between 1920 to 2170 MHz with a gain more than 10 dB of each element.
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