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The transient response of a thin wire in the presence of a half-space is calculated with a new formulation of the Method of Moments (MoM) in time domain, based on a novel Time-Domain Mixed Potential Integral Equation (TD-MPIE), using complex-time Green's functions. The excitation is a Gaussian voltage source and the solution is obtained by using a Marching-On-in-Time (MOT) procedure. Band-Limited...
In this paper, a new design of an S-band, self-phased, one-turn quadrifilar helical antenna (QHA) has been presented. The antenna has been analyzed in purposed of desired radiation pattern by numerical method. A new matching technique has been used to improve VSWR of the QHA. The experimental results show the radiation pattern has Nadir null of about 6 dB and Axial Ratio is better than 1 dB. In addition,...
The rapid calculation of the far-field radiation fields of a reflector antenna by optimum meshing size is reported. The reflector can be the intersection of a cone with any surface of revolution or an offset sector of any surface of revolution. The feed is assumed to be linearly polarized and located in a desired place in front of the reflector. The reflector is analyzed by Geometrical Optics (GO)...
In this paper, design and implementation of ground station (GS) antennas are presented to control UAV by use of data radio link between UAV and GS based on spread spectrum in frequency band of 780-880MHz at the maximum range of 100Km. Gain, frequency bandwidth, polarization, radiation pattern, and the height of installed antenna from the ground are very important in regard to UAV maneuver and desired...
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