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Meta-surface inspired antenna (called MACKEY) which works not only in free space but also on metal plates, was proposed. In this paper, a dual-band MACKEY device, in which the position of the dipole antenna is changed from the center of the substrate, is proposed. Additionally, the conditions for controlling the resonance frequencies are clarified.
A tunable band-stop filter based on coplanar waveguide (CPW) with defected ground structure (DGS) is proposed. Filter structure has DGS-units in the ground plates of the simple CPW transmission line. Resonant frequency tuning achieved with a movement of the metal plates, same size as DGS-units, above the substrate of the CPW line. In down position the DGS-slots are covered by metal plates and filter...
This paper presents a analysis of planar double-negative (DNG) metamaterial unit cell, named split ring resonator (SRR), to obtain better miniaturization at microwave frequencies for a given physical cell size. In this study, electromagnetic transmission characteristics of square split ring resonator and circular split ring resonator of same area are investigated in a comparative manner for varying...
In this paper, we proposed a radio frequency (RF) stretchable sensor using 3D printing, Ecoflex elastomer and eutectic gallium-indium (EGaIn). The proposed stretchable sensor is composed of two complementary split ring resonators (CSRRs). We can detect amount of stretching length from variation of resonant frequencies. Initially, two resonators are designed to resonate 2.03 GHz and 3.63 GHz. When...
In this research work, the design characterization of metamaterial absorber has been investigated for X-band applications. For this purpose, a primary regular decagon shaped loop structure has chosen and its multi band response has been studied and analyzed. The simulated results show that absorption peaks occur at 8 GHz, 10 GHz and 12 GHz with absorbance peak response of 96 %, 93.36 % and 91.88 %...
A half power divider using ridge gap waveguide technology is realized in millimeter wave frequencies. By machining a piece of metal the divider was fabricated. There is no need to an electrical connection between the divider constitutive parts. The fabricated divider is self-packaged. Cylindrical pins are used in the divider structure for ease of fabrication. Low loss power division and good isolation...
The aim of this work is the study of the performance of planar inductors due to the presence of shielding structures. Equivalent inductance, quality factor and self resonance of the component are chosen as figures of merit for a fair comparison. Two experiments are proposed. In the first one, identical inductor geometries are evaluated under three different electromagnetic boundary conditions:(i)...
Previously, we have revealed an efficient light trapping performed by arrays of cross-like substantially thick metal nanoantennas. This light trapping implied a broad spectrum of solar light concentrated in a subwavelength depth of the semiconductor substrate. In this review paper, we show that our arrays support so-called leaky domino-modes, responsible for the broadband resonant absorption in the...
The 0-th shear horizontal (SH0) mode plate wave has an electromechanical coupling factor k2 larger than 50% in a (0°, 120°, 0°) LiNbO3 (LN) plate thinner than 0.1λ, where λ is a pitch of an intergidital transducer (IDT). In the previous study, ultra-wide-band ladder filters composed of cavity type resonators recorded 6 dB bandwidth from 41% to 51% in a digital TV band. However, the structure is fragile,...
A microstrip patch antenna is a planar directional antenna in which a metal patch is placed on top of a dielectric substrate which in turn is placed on top of a metal ground plane. The power transfer between a source and antenna is done through a feed line. In general, the characteristic impedance of a transmission line is 50 ohms. By maximum power transfer theorem, the patch antenna should be fed...
Metasurfaces are artificial electromagnetic boundaries usually implemented as two-dimensional periodic arrays of engineered inclusions with sub-wavelength periodicity, which may serve as useful tools to control characteristics of electromagnetic fields. Recently the authors have proposed employing a class of frequency selective metasurfaces with self-complimentary patterns to construct optically thin...
In this work we introduce a planar ground-free terahertz absorber suitable for large-area manufacturing. The lack of a ground plane in the absorber design may pave the way for frequency-selective response that is an essential requirement for invisible sensors and wave filters. The absorber is to be manufactured using state-of-the-art techniques of large-area printing, within the frame of a joint project...
A frequency-switchable half-mode substrate integrated waveguide (HMSIW) antenna with different cases of metallic caps is proposed. The resonant frequency of the HMSIW antenna is widely switched when liquid metal (eutectic gallium indium; EGaIn) is injected into a single vertical fluidic hole. The position and dimensions of the fluidic hole are chosen in order to maximize the tuning range and peak...
In this paper, a millimeter-wave wideband bandpass filter is proposed and designed by using novel slotted substrate integrated waveguide (SIW) units. The unit consists of two pairs of same size dumbbell slots etched on both the top and bottom metal planes of the SIW. The slots act as shunt resonators, which reduce the filter size and produce transmission zeros simultaneously. A five-order bandpass...
Radiation characteristics of an input decoupling network for switching DC-DC converters are analyzed by a set of electromagnetic (EM) simulations. Input decoupling network is a part of a DC-DC converter with a dominant contribution to its radiated emissions. The impact of geometrical parameters of an input decoupling network such as the dimensions of metal plates on a printed circuit board (PCB),...
Various domestic appliances have become wireless, and it is necessary to establish a design theory for a small antenna. In this report, we suggest a model that has a dipole antenna unified with an AMC (Artificial Magnetic Conductor) substrate, and we show that the AMC substrate becomes a wide-plate dipole and operates as a radiation element.
We present in this paper a new passive ceramic corrosion sensor which can be integrated into a structure submitted to a corrosive environment. The corrosion detection mechanism is based on the modification of a resonator frequency as a function of the corrosion level. An alumina substrate is covered with a metal enclosure that is protected against corrosion apart from the middle of the top face. This...
For the better performance of piezoelectricity actuated ultrasonic nebulizer, some factors, which may have effect on the performance, are analyzed. A conclusion that the change of the cone angle in the vibration of the nebulizer does some contribution to the performance is got. According to this fact, a concept “moving cone angle” is put forward. The working principle of “moving cone angle” is introduced,...
We discuss here the possibility of using suspended metal electrodes for the excitation of surface acoustic wave (SAW) and single-mode bulk acoustic wave (BAW) resonator structures. The idea is, on one hand, to separate the driving electrodes from the piezoelectric substrate, being also the acoustic wave carrier substrate. While, on the other, to employ grooved surface gratings which can either reflect...
An infrared detector that uses nonlinear oscillation is proposed. The torsional oscillator has bi-material structure. When the infrared is incident and absorbed at the torsional oscillator increasing the local temperature, the thermal stress due to the difference of thermal expansions of the materials bends the oscillator. This bending hardens the spring constant of torsional oscillator and results...
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