Low profile dielectric resonator antennas using a very high permittivity material

Mongia, R.K.; Ittibipoon, A.; Cuhaci, M.

doi:10.1049/el:19940924

Cited by 144 publications

(62 citation statements)

References 5 publications

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“…5, the dielectric woodpile EBG generates a band-gap region at the normalized frequency with in-band rejection of about . In this design the rectangular grains of the odd-numbered layers (#1, 3,5,7) are parallel to the electric field and hence produce a larger effective permittivity than the even-numbered layers . Therefore, a wave impedance contrast exists between the layers that is responsible for the rejection level at the band-gap region.…”

Section: A Ebg Structuresmentioning

confidence: 99%

See 1 more Smart Citation

Magneto-Dielectrics in Electromagnetics: Concept and Applications

Mosallaei

Sarabandi

2004

IEEE Trans. Antennas Propagat.

435

208

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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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Section: A Ebg Structuresmentioning

confidence: 99%

“…Antenna miniaturization using high permittivity materials as substrates has been attempted in the past [4], [7]. Although miniaturization can be achieved using high dielectric materials, there are two drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Magneto-Dielectrics in Electromagnetics: Concept and Applications

Mosallaei

Sarabandi

2004

IEEE Trans. Antennas Propagat.

435

208

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“…One of the most common miniaturization techniques is the loading of the antenna volume with different materials [1]- [4]. Most traditionally, high permittivity dielectrics have been used to decrease the physical dimensions of the radiator, e.g., [5]- [7]. Common problems encountered with high permittivity substrates include, e.g., the excitation of surface waves leading to lowered radiation efficiency and pattern degradation, and difficulties in the impedance matching of the antenna.…”

mentioning

confidence: 99%

Magnetodielectric Substrates in Antenna Miniaturization: Potential and Limitations

Ikonen¹,

Rozanov

Осипов

et al. 2006

IEEE Trans. Antennas Propagat.

201

119

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“…Hwang et al investigated planar inverted F antenna loaded with very high permittivity ceramic materials (r ϭ 8, 80) [5]. Mongia et al reported low profile rectangular resonator antennas fabricated out of a very high permittivity material (r ϭ 100) [6]. Perrota et al studied the radiation of probe-fed microstrip antennas on very high permittivity substrate (r ϭ 80) and very small ground plane [7].…”

Section: Introductionmentioning

confidence: 99%

Aperture-coupled microstrip antennas loaded with very high permittivity ceramics

Hwang¹,

Zhang²,

Lo³

2003

Int J RF and Microwave Comp Aid Eng

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The use of very high permittivity ceramic materials (r ‫؍‬ 38, 80) to miniaturize an aperture-coupled microstrip patch antenna is reported in this article. A loss of the antenna gain in such a technique is observed, and then a novel substrate-superstrate structure is developed to enhance the gain. The whole process of gain enhancement is analyzed by using the finite-difference time-domain (FDTD) method. The simulations are excellently correlated with the experiments. They validate that the loss of the antenna gain can be recovered up to that of conventional microstrip antennas loaded with low permittivity materials (r < 3). In addition, the performance comparison of the aperture-coupled microstrip antenna of very high permittivity with the probe-fed microstrip antenna of very high permittivity is presented. It is shown that the aperture-coupled antenna has wider impedance and radiation bandwidths than the probe-fed one while keeping the antenna gain at about the same level.

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Low profile dielectric resonator antennas using a very high permittivity material

Cited by 144 publications

References 5 publications

Magneto-Dielectrics in Electromagnetics: Concept and Applications

Magneto-Dielectrics in Electromagnetics: Concept and Applications

Magnetodielectric Substrates in Antenna Miniaturization: Potential and Limitations

Aperture-coupled microstrip antennas loaded with very high permittivity ceramics

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