Broadband Characterization of Complex Periodic EBG Structures: An FDTD/Prony Technique Based on the Split-Field Approach

Mosallaei, Hossein; Rahmat‐Samii, Y.

doi:10.1080/02726340390159478

Cited by 44 publications

(29 citation statements)

References 18 publications

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“…Also (A. 16) Equations (A.15) and (A.16) are the basic tools to analytically obtain the reflection/transmission coefficients of the layered anisotropic medium.…”

Section: Appendixmentioning

confidence: 99%

“…Here, a powerful method based on the FDTD approach is applied [14]. The FDTD in conjunction with the PBC and PML walls [15], [16] allows for characterizing plane wave propagation within an arbitrary 3-D periodic structure. The FDTD method is appropriate for this application as it can provide the EM behavior of the magneto-dielectrics over a wide frequency range.…”

Section: B Fdtd Techniquementioning

confidence: 99%

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Magneto-Dielectrics in Electromagnetics: Concept and Applications

Mosallaei

Sarabandi

2004

IEEE Trans. Antennas Propagat.

434

201

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Abstract-In this paper, the unique features of periodic magneto-dielectric meta-materials in electromagnetics are addressed. These materials, which are arranged in periodic configurations, are applied for the design of novel EM structures with applications in the VHF-UHF bands. The utility of theses materials are demonstrated by considering two challenging problems, namely, design of miniaturized electromagnetic band-gap (EBG) structures and antennas in the VHF-UHF bands. A woodpile EBG made up of magneto-dielectric material is proposed. It is shown that the magneto-dielectric woodpile not only exhibits band-gap rejection values much higher than the ordinary dielectric woodpile, but also for the same physical dimensions it shows a rejection band at a much lower frequency. The higher rejection is a result of higher effective impedance contrasts between consecutive layers of the magneto-dielectric woodpile structure. Composite magneto-dielectrics are also shown to provide certain advantages when used as substrates for planar antennas. These substrates are used to miniaturize antennas while maintaining a relatively high bandwidth and efficiency. An artificial anisotropic meta-substrate having , made up of layered magneto-dielectric and dielectric materials is designed to maximize the bandwidth of a miniaturized patch antenna. Analytical and numerical approaches, based on the anisotropic effective medium theory (AEMT) and the finite-difference time-domain (FDTD) technique, are applied to carry out the analyzes and fully characterize the performance of finite and infinite periodic magneto-dielectric meta-materials integrated into the EBG and antenna designs.Index Terms-Anisotropic effective medium theory (AEMT), antenna miniaturization, electromagnetic band-gap (EBG) materials, finite-difference time-domain (FDTD) technique, magneto-dielectrics, meta-materials, periodic structures.

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“…Also (A. 16) Equations (A.15) and (A.16) are the basic tools to analytically obtain the reflection/transmission coefficients of the layered anisotropic medium.…”

Section: Appendixmentioning

confidence: 99%

Section: B Fdtd Techniquementioning

confidence: 99%

Magneto-Dielectrics in Electromagnetics: Concept and Applications

Mosallaei

Sarabandi

2004

IEEE Trans. Antennas Propagat.

434

201

View full text Add to dashboard Cite

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“…(1) [15] . 이를 바탕으 로 Fullwave 시뮬레이션을 통하여 1.81 GHz에서 인 공 자기 도체의 특성을 가지는 단위 격자를 설계하 였으며 [16] , 표 2에 최종적으로 결정된 인공 자기 도 체의 단위 격자 크기를 기록하였다.…”

Section: ⅰ 서 론unclassified

The Radiation Characteristics Improvement and Thickness Reduction of Base Station Antenna with Artificial Magnetic Conductor

Son¹,

Ahn²,

Chang³

et al. 2009

The Journal of Korean Institute of Electromagnetic Engineering

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In this paper, a Base Station Antenna(BSA) utilizing Artificial Magnetic Conductor(AMC) as reflector instead of common conductive plate to improve radiation characteristics and achieve low-profile is proposed. In the case of the conventional BSA on conductive surface which acts as a reflector, a secondary radiation is caused at the corner of the conductive surface, and it increases the back-lobe of the antenna, resulting in deteriorating the radiation characteristic of the conventional BSA. However, using the AMC, the back-lobe of the BSA can be largely reduced by the surface wave suppression. And the Side-Lobe Level(SLL) is also improved, resulting in preventing the service area overlapped. Furthermore, due to the 0° reflection phase on AMC, the profile of the BSA can be also reduced.

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“…3 depicts the geometry of a patch antenna printed on the ECM substrate. A Finite Difference Time Domain (FDTD) technique [4] is applied to comprehensively investigate the interaction of antenna with its composite substrate and obtain the antenna retum loss as shown in Fig. 3.…”

mentioning

confidence: 99%

Embedded-circuit and RIS meta-substrates for novel antenna designs

Mosallaei

Sarabandi

2004

IEEE Antennas and Propagation Society Symposium, 2004.

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1.Abstract: Antenna miniaturization with enhanced radiation performance is a contemporary problem with application in RF and wireless systems. The substrate and ground plane of antenna play a very important role in achieving the desired antenna characteristics. The focus in this paper is to present the applications of two types of meta-substrates for novel antenna designs, namely, Embedded-Circuit Meta-material (ECM) and Reactive Impedance Surface (RIS) substrates. ECM provides a way to fabricate an E-p substrate, allows antenna miniaturization with relatively high bandwidth and efficiency. Also, a novel compact RIS as the ground plane for a dual-band Eshaped patchislot antenna is proposed to reduce the interaction of antenna with its ground and design a miniaturized wideband antenna system. 2.Magneto-Dielectric Embedded-Circuit Medium: Antenna miniaturization using high permittivity materials as substrate has been attempted in the past [l]. Although miniaturization can be achieved using high dielectric materials, there are two drawbacks. One problem stems from the fact that the field remains highly concentrated around the high permittivity region (field confinement), which results in low antenna efficiency and narrowband characteristics. The second drawback pertains to the fact that the characteristic impedance in a high permittivity medium is rather low which creates difficulties in impedance matching of the antenna. These aforementioned problems can be effectively circumvented if one uses a magneto-dielectric material. Magnetodielectric materials can also miniaturize the antenna by the same factor however using moderate values of permittivity and permeability ( n = G ) . Therefore, the issue of strong field confinement is minimized and the medium is far less capacitive when compared to the dielectriconly high permittivity material. Furthermore, since the characteristic impedance of magnetodielectric medium (7 = 7 " m ) is close to that of the surrounding medium ( vo) it allows for ease of impedance matching over a much wider bandwidth.It has been shown by Hansen and Burke [2], that the zero-order bandwidth for an antenna over a magneto-dielectric substrate with thickness t can be approximated by Thus for a given miniaturization factor (constant 6) the antenna bandwidth can be enhanced by increasing ,u,/&, ( p , > 6,). However, the main engineering question is that "how one can obtain a magnetic material with relafively large permeability'. Basically, the naturally available magnetic materials operate only up to lower UHF band. It was demonstrated in [3] that a periodic structure of high Q resonant tank circuits embedded in a low permittivity dielectric material has the potential to successfully obtain an E+ medium at any frequency of interest. In this work we design a compact embedded-circuit structure which is constructed of miniaturized tank circuits made up a wire loop and an interdigated capacitor (see Fig. I). A unit cell transmission line model of the structure is shown in Fig. l(b). The magnetic flux l...

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Broadband Characterization of Complex Periodic EBG Structures: An FDTD/Prony Technique Based on the Split-Field Approach

Cited by 44 publications

References 18 publications

Magneto-Dielectrics in Electromagnetics: Concept and Applications

Magneto-Dielectrics in Electromagnetics: Concept and Applications

The Radiation Characteristics Improvement and Thickness Reduction of Base Station Antenna with Artificial Magnetic Conductor

Embedded-circuit and RIS meta-substrates for novel antenna designs

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