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Reducing the radar cross section (RCS) is important to suppress radio wave interference. Many radar absorbent material (RAM) have been investigated according to performance requirements. This paper presents the RCS reduction characteristics of RAM composed of dielectric materials for 3 GHz. The optimum values of dielectric substance condition to design flat layer RAM are investigated. Moreover, RCS...
A reconfigurable Yagi-Uda with the liquid metal is proposed in this article. By a new electrochemical method for reversible, we control the length of liquid eutectic gallium indium (EGaIn) in the capillary. Electrochemical deposition (or explode) of a surface-oxide on the EGaIn significantly lowers (or increases) its tension to induce the liquid metal up (or down) of the capillary. The three-element...
An integrated slot antenna with a very low profile of 4 mm to the top edge of the notebook metal cover for WLAN operation is proposed. The antenna was integrated in the top cover and fed by soldering the cable across the slot. The antenna design consisted of two parallel-connected slot portions with the dimensions 80 mm and 2 mm. The larger slot portion contributed to both half- and the one-wavelength...
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.
Terahertz technology has grown much interest especially in the imaging field. This development, compliant with the low-cost sub-micron CMOS process for focal plan array configuration, addresses some issues about the performances of antennas on a silicon substrate and on a reduced metal stack. Here, two antenna geometries are studied on different electromagnetic (EM) environments and coupling characteristics...
In this letter, a Vivaldi antenna with wideband RCS reduction using Electromagnetic Band Gap Absorbing Structure (EBGAS) is designed. The EBGAS coveres on the antenna ground. The EBGAS constructed by split rectangular ring loaded with resistors and dielectric spacer. Compared with the metal ground Vivaldi antenna, RCS has reduced about 15 dB in the frequency band of 4–18 GHz and almost without gain...
This paper presents a rigorous analysis of electromagnetic scattering and transmission of dual-metallic grating screens. The Fourier transform is used to represent the electric and magnetic fields in the spectral domain and the boundary conditions are enforced to obtain simultaneous equations using the mode-matching technique. Numerical results show that the dual-metallic grating screens exhibit asymmetric...
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