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In this paper, a novel low-profile RFID antenna is proposed. Based on original microstrip patch antenna, the tag antenna adopts a shorted stub and H-shape slot. Implementing a shorted stub can easily match the impedance of RFID chip. Using H-shape slot increases the length of current path on patch, miniaturizing the tag antenna. The size of the proposed antenna is 62 × 18 × 0.79mm3 and its simple...
Accurate electromagnetic (EM) analysis is performed for transmission line structures with finite-thickness conductors. Traditionally, the analysis ignores the thickness of conductors to simplify the model but such an ignorance may not be allowed in many applications. In this paper, a rigorous three-dimensional (3D) model without any geometric approximation is established and the method of moment (MoM)...
In this article, a compact antenna is presented with an appropriate structure which has a good performance used on the dielectric and metallic objects. The loading bar and the meandered section are added to achieve a proper impedance matching between the antenna input terminal and the reference microchip whose impedance is 13-j143Ω. The antenna's wings are utilized to improve the performance when...
Air-coupled piezoelectric transducers made of 1–3 connectivity PMN-PT single crystal composites (centre frequency around 1.0 MHz) were designed, built and characterized. Several matching layers configurations have been tested in order to achieve optimum sensitivity or bandwidth or both. Results are compared with those obtained from similar transducers made using 1–3 PZT ceramic piezocomposites. Both...
This paper presents the design of an ortho-mode transducer (OMT) to separate two orthogonal linearly polarized signals traveling in a circular waveguide with frequency channels at 150/255 GHz band. Simulations (in HFSS) are presented to determine the optimal probe geometry and feed impedance to achieve good coupling to the optimized probes over a wide bandwidth with corresponding feed impedances for...
Summary form only given. Miniature discharges and their potential use for local area materials processing including etching, surface activation, and plasma-assisted CVD are investigated in this study. The objective of this study is to do materials etching steps on localized areas by applying a small discharge to only the region being processed. A miniature microwave plasma discharge applicator design...
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