Electromagnetic band-gap structures: Classification, characterization, and applications

Conference Paper · February 2001with115 Reads
DOI: 10.1049/cp:20010350 · Source: IEEE Xplore
Conference: Antennas and Propagation, 2001. Eleventh International Conference on (IEE Conf. Publ. No. 480), Volume: 2
Abstract
When periodic structures interact with electromagnetic waves amazing features result. In particular, characteristics such as frequency stop-bands, pass-bands and band-gaps could be identified. Surveying the literature, one observes that various terminology have been used depending on the domain of the applications. These applications are seen in filter designs, gratings, frequency selective surfaces (FSS), photonic crystals and band-gaps (PBG), etc. We classify them under the broad terminology of “electromagnetic band-gaps (EBG)”. The focus of this paper is to present a powerful computational engine utilizing finite difference time domain (FDTD) technique integrated with the Prony method to analyze and understand the unique propagation characteristics of different classes of complex EBG structures such as, (a) FSS structures, (b) PBG crystals, (c) smart surfaces for communication antenna applications, (d) surfaces with perfectly magnetic conducting properties (PMC), (e) creation of materials with negative permittivity and negative permeability, (f) surfaces with reduced edge diffraction effects, and (g) the notion of equivalent media. The performance of two types of the EBG structures namely, single and multi-layered tripod FSS, and rectangular, triangular and woodpile PBG crystals is detailed. Some of the potential applications of these structures are highlighted
    • "In these sensors, the notch depth is proportional to the amount of the displacement. Well-known Electromagnetic Band Gap (EBG) structures consisting of periodic objects, called unit cells, prohibit the propagation of electromagnetic fields in a specific frequency range [10], [11]. Unit cells can be repeated in one, two, or three dimensions of the structure. "
    [Show abstract] [Hide abstract] ABSTRACT: In this paper, a microwave displacement sensor that is based on electromagnetic bandgap structure is proposed. The periodic air holes realized in a silicon substrate cause bandgap in the transmission response of coplanar waveguide (CPW) line printed on this substrate. The proposed sensor consists of a CPW line loaded by periodic air holes along the transmission line and another periodic substrate that is located on the top of this CPW line. If the upper substrate is moved along the line, the maximum insertion loss will change, and therefore, a displacement sensor based on notch in the transmission coefficient is realized. The distance dynamic range of this sensor is limited by half of the period of the air holes. Moreover, the sensitivity of the sensor for a specific period depends on the number of unit cells. The sensitivity is similar to 4 dB/100 mu m with 2.5-mm linear dynamic range (corresponding to 62-dB variation in maximum insertion loss) for ten unit cells with a period of 5 mm. The response of the sensor is almost independent of temperature, and the sensor needs a simple fixed frequency circuit to measure the displacement. The transmission line model of the sensor is also presented and discussed.
    Full-text · Article · May 2016
    • "The bandwidth and size of the dual-cap mushroom-like unit cell are compared with those of other unit cells such as the conventional mushroom-like unit cell in [3][4][5][6], square patch in [7], UC-PBG lattice in [8], waffle-like unit cell in [9], square loop in [10], and Minkowski fractal mushroom-like unit cell in [11]. For fair comparison, these unit cells are redesigned to operate at the same operating frequency of 1.58 GHz and on the same type substrate with a relative permittivity of 3.66, a loss tangent of 0.004 and a thickness of 1.6 mm. "
    Full-text · Conference Paper · Apr 2016 · IEEE Sensors Journal
    • "Electromagnetic Band-Gap (EBG) Structure is an area of metamaterial antenna research in which researchers are growing interested and investigating. Loading EBG to antennas imparts, to the antennas, many properties including surface wave suppression, band rejection or increased gain [10]. But there has not been much research on fractals loaded as EBG. "
    Full-text · Conference Paper · Jul 2015 · IEEE Sensors Journal
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