negative permittivity
Efficient Electrically Small Oblate Spheroidal and Spherical Antennas in Shells with Negative Permittivity
... The normed quality factors of the antennas simulated with the approximate (19) and exact (21) formulas of the quality factor are presented in Fig. 8. Frequency derivatives of impedance components were taken for Drude’s ...
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Interaction of a Sine Wave with an Artificial Negative Permittivity Medium Using Nonstandard FDTD
... The NS-FDTD algorithm is implemented for artificial negative permittivity medium, and the results are compared with the standard FDTD. The reflection mechanism from the medium is analyzed using a sine wave of ...
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Wideband Negative Permittivity Metamaterial for Size Reduction of Stopband Filter in Antenna Applications
... The design objective for the antenna harmonic suppression was based on cascading the antenna to a stopband filter within the antenna harmonics frequencies. For the sake of antenna miniaturization, the stopband filter was ...
12
Effect of negative permittivity and permeability on the transmission of electromagnetic waves through a structure containing left handed material
... We investigate the characteristics of electro- magnetic wave reflection and transmission by multilayered structures consisting of a pair of left-handed material (LHM) and dielectric slabs inserted between two ...
6
A Negative Refractive Index Metamaterial Based on a Cubic Array of Layered Nonmagnetic Spherical Particles
... a negative permeability, while the other set is composed of a plasma semiconductor, which contributes a negative ...generate negative permeability), but embedded in a negative ...
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Left-Handed Materials Based on Crystal Lattice Vibration
... the negative refractive index, we put a CTO rod at both sides of a LT sphere symmetrically, and the space between the CTO rod and the LT sphere is ...a negative permittivity within a wide range as ...
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An Improved CRLH Wide-Band Filter Using CSRRs with High Stop Band Rejection
... Equivalent negative permittivity ε is achieved near the resonant frequency, and phase constant is imaginary, which indicates that electromagnetic wave will attenuate rapidly and stop band ...
9
Microstrip antenna's gain enhancement using left-handed matematerial structure
... the negative value of permeability, µ and the negative permittivity, ...the negative refraction characteristics of the LHM structure that acts as a lens when placed in front of the ...
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Transmission Characteristics on Composite Right/Left-Handed Cylindrical Waveguides Constructed by the Cutoff TE and TM Modes
... mode and the dominant TE mode cannot be equal to each other only by the division. So we introduce a ridge in the center of the sector guide. The effect is the same with the ridge installed in the rectangular waveguide as ...
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Circularly Polarised Rectangular Micro-strip patch Antenna using Meta-material
... This paper presents a rectangular micro-strip patch antenna having FR-4 as substrate using single rectangular unit cell of meta-material that exhibits negative permittivity as well. as negative ...
7
Negative Index Material Composed of Meander Line and Srrs
... simultaneously negative permittivity and permeabil- ity ...effectively negative permittivity and split ring resonators (SRRs) had effectively negative permeability in specified frequency ...
12
Optical, thermal and dielectric studies of silver silica nanoparticles synthesized via sol gel technique
... Keywords: dielectric properties, negative permittivity, refractive index, Silver Silica nanocomposite, sol-gel, various composition, thermal properties... Silver-silica nanocomposites Ag[r] ...
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Compact Base Station Antennas Using Metamaterials
... effective permittivity of this metamaterial calculated by a retrieval procedure shows that the material made of continuous metallic wires presents a negative permittivity and is reflective, while the ...
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Tunable Metamaterial Design Composed of Triangular Split Ring Resonator and Wire Strip for S- and C- Microwave Bands
... the permittivity in 1996 [2], and a metallization of split rings can be manufactured for negative permeability in 1999 ...simultaneously negative permittivity and permeability and carried out ...
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STUDY OF METAMATERIAL APPLICATIONS IN MICROSTRIP FILTERS
... shows negative permeability at a narrow magnetic frequency resonant band and to obtain LHM, an additional metallic rod is to be incorporated with the SRR for electrical resonance(negative ...
7
Microwave Tunable Metasurfaces Implemented with Ferroelectric Materials and Periodical Copper Wires
... tunable permittivity and a periodical copper-wire structure with negative permittivity, is analyzed and used as building blocks to construct metasurfaces for beam steering and beam focusing, ...
12
Miniaturize Negative Index Metamaterial Structure Loaded Filtenna
... with negative effective permeability and negative effective permittivity is ...both negative permeability and negative permittivity with a frequency range matched with the ...
8
Size Effects and Reliability of (Ba,Sr)TiO3 Thin Films
... Some earlier reports suggest that AC stress may be important[126, 166]. As there was not an available system capable of performing the necessary measurements, one was constructed. The difficulty of AC reliability testing ...
339
Measurement of Complex Permittivity of Dielectrics and Its Applications
... The permittivity also depends on environment related parameters such as temperature and moisture content ...complex permittivity which describes the material behaviour when it is subjected to an electric ...
6
Design of a bilayer ceramic capacitor with low temperature coefficient of capacitance.
... We have recently reported the use of finite element modelling to predict the required optimal volume fraction of a CS structure to obtain minimisation of the TCC response based on a combination of two materials. ...
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