A compact rectangular dielectric resonator antenna (DRA) is presented for ultra wide band communication systems. Ansoft HFSS 3D electromagnetic solver is used for the design optimization and measurement results are also provided. The proposed antenna has a low profile (ϳ3), a small size, and a low permittivity constant (10.2). An impedance bandwidth about 46% (from 6.9 to 11 GHz) was achieved making this antenna suitable for UWB applications.ABSTRACT: A spiral antenna matched to a SAW sensor for blood pressure and body temperature monitoring is proposed. As the antenna/ SAW device is dedicated to be implanted in a human body, a small antenna with omnidirectional pattern is required. The proposed structure has a total area of 4 ϫ 2.5 mm 2 and a 1.1 mm height. To take into account the human body effect, we use a homogenous phantom with a dielectric permittivity of 52 and a conductivity of 1.74 S/m. The Ϫ10 dB impedance bandwidth of the proposed antenna is 66% from 2.22 to 3.83 GHz; moreover, a quasi-isotropic radiation pattern is achieved.
These paper presents a new 3X3 array design using a microstrip patch array antenna to operate at 2.45GHz. The aim of this antenna array construction is to obtain high directivity. The element of the array is microstrip square patch antenna using V-shaped symmetric-slit along with rectangular slot in diagonal direction at the centre of square patch radiator to achieve the circularly polarized radiation and each element is fed by inset feed. The size and feed position of the single microstrip square patch is determined through the theoretical design and CST microwave studio software simulation. Based on which an array of six elements with equal sizes and equal spacing is designed on a planar substrate. The simulation results in this paper can be used as design reference for the practical design of the rectenna.
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