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Dyadic Green's function for an arbitrarily shaped lossy dielectric object is presented. It is derived based on surface integral equations. Application of the presented dyadic Green's function allows a detailed study of radiation pattern and power loss of an antenna in the presence of a lossy medium. Numerical computations are implemented for a dipole in the vicinity of a lossy dielectric sphere, the...
With the development of offset reflector antennas with high performance, the growing demands for high frequency, low sidelobe level and reduced mass have brought structural design and manufacturing process stringent requirements. The coupled structural-electromagnetic problem of offset reflector antennas is studied to find out the prime structural factors which have a great effect on electromagnetic...
A 5.2 GHz band-notched ultra-wideband monopole antenna using a proximity coupled resonator is proposed. Compared with conventional methods which transform antenna/ground structures to achieve band-notches, the proposed monopole antenna uses a coupled resonator to obtain a band-notch at 5.2 GHz and does not change the antenna surface current distribution. Two layer substrates are used and the resonator...
The hybrid smart antenna algorithm (HSAA) relies on elimination of the array elements with the smallest received signal powers in the beamforming process in order to improve the computational efficiency, and reduce the hardware cost. Earlier computer simulations (Liberti and Rappaport, 1999) suggested that it is possible to further suppress the sidelobes by employing directive array elements. In this...
A novel circular wire antenna suitable for ultra wideband (UWB) applications is presented in this paper. It consists of a circularly curved wire over a ground plane. The wire structure is designed to deliver approximately the same benefits as a circular disc antenna. Effective length is introduced to analyze the operation of the antenna. Experimental results of the antenna have demonstrated the antenna...
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