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We proposed an improved technique of the analysis accuracy for the characteristic basis function method (CBFM) using the multilevel approach. In this technique, improved primary CBFs (IP-CBFs) are used for taking into account multiple scattering between each block. The radar cross section (RCS) of a perfect electric conductor cube was analyzed by using the proposed technique. It was found that analysis...
A through-hole less microstrip line to waveguide transition is proposed in this paper. Conventional transitions are required through-holes in order to prevent unwanted emission in the substrate. However, the product cost of the transition is increased by making through-holes. In addition, the through-holes will be broken by heat deformation of the dielectric so that the characteristics of the transition...
We demonstrate a simple and cost-effective method for fabricating silver-nanoparticle metamaterial structures on a flexible substrate based on inkjet printing. Specifically, we used inkjet printing with an ordinary printer to obtain an array of split-ring resonators (SRRs) on a sheet of paper. We designed the SRR array to exhibit a resonance in the THz region, which we observed through THz time-domain...
Checkerboard patterns (CPs) are a kind of metamaterials which have simple structure. Electromagnetic responses of CPs are unique and drastically changed by the configuration variation of self-complementary metal CPs. In this study, we investigated the influence of self-complementary metal CP configuration that consists of both capacitive CP and inductive CP, on transmittance of x- and j-polarized...
Seawater can be used as an antenna element because of its relatively high electrical conductivity. It can operate as a monopole antenna by squirting the seawater into the air and feeding. Moreover it has the advantages of being dynamic and reconfigurable. This paper reports the design of an efficient feeding structure for a seawater antenna. The viability of this seawater antenna is confirmed by a...
In this paper, we evaluated the hierarchical generation technique of characteristic basis function combined with singular value decomposition (SVD). This method enables us to analyze a scattering field with a high accuracy with small-scale matrix. By calculating the radar cross section (RCS) of a large conductor cylinder, we evaluated the technique. The solutions of proposed and conventional method...
Unlike metal antennas, an antenna that is composed of plasma can switch its operation/non-operation by turning the plasma on and off. In this paper, we propose a monopole plasma antenna that operates as a radiator in the C-band. The antenna was designed and considered using numerical calculations and measurements. The simulated and measured results were in good agreement. The directivity was similar...
Air-coupled ultrasonic transducers are widely used in object detection devices. In general, the detection range of an object detection device using an air-coupled ultrasonic transducer is short because the radiation efficiency of air-coupled ultrasonic transducers is very low. It is necessary to extend the detection range of air-coupled ultrasonic transducers for use in object detection devices such...
In this paper, we proposed Improved Primary Characteristic Basis Function Method (IP-CBFM). This method enables us to analyze a scattering field in a specific coordinate plane with a high accuracy with small-scale matrix equations. IP-CBF is the combined CBF of Primary and Secondary CBF. By calculating the Radar Cross Section (RCS) of a perfect electric conductor plate, we evaluated the technique...
In this paper, an ultra wideband(Over 18:1 bandwidth) and dual polarized shared aperture taper slot antenna is proposed. The proposed antenna is composed of low band and high band elements, and the high band elements are arranged between the low band elements to achieve smaller aperture of antenna. The feasibility of the proposed antenna is shown through numerical simulation and experiments.
In recent years, proactive surgical treatment has been reported to be effective for medication-related osteonecrosis of the jaw (MRONJ). However, an uncertain resection entails the risk of recurrence, whereas an extensive surgical procedure may lead to a marked reduction in quality of life as a result of reduced masticatory function and poor cosmesis. Therefore, radiological assessment can be helpful...
Checkerboard patterns (CPs) are a kind of metamaterials which are attracting much attention for their application to sensing devices. In this study, we have investigated the electromagnetic responses of the CPs in infrared (IR) region. We have fabricated the CPs with two different metals and measured the transmittance to clarify the influence of metal resistivity of the CPs on transmittance. As a...
The demand for RFID tags that can be read by both HF and UHF RFID systems has been rapidly increasing. In this paper, we propose a novel HF/UHF dual-band tag antenna configuration that utilizes an HF coil conductor positively as a UHF antenna conductor. In order to control UHF current flowing on the coil and to achieve high radiation efficiency, the coil windings are coupled capacitively. The inductively...
In this paper, we verified the Poggio, Miller, Chang, Harrington, Wu and Tsai - Characteristic Basis Function Method (PMCHWT-CBFM) by applying the extended version of the CBFM for analyzing the radar cross section (RCS) of the array antenna. The method can be reduced memory usage of calculation compared with those of the direct MoM.
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