Wireless power transmission (WPT) is undergoing excessive investigations in several applications. In order to become one of the epoch-making future technologies, there are still several challenges to ...overcome. Rectifying antennas present a key element in this technology for their simplicity and auspicious prospect. In this paper, we introduce an electromagnetic model of a rectifying antenna. Our work is based on a hybrid MoM-GEC (the method of moments combined to the generalized equivalent circuit technique) and the auxiliary sources method (MAS). First, a comparison between two different GEC methodologies was accomplished in order to validate our final choice of the appropriate equivalent electrical circuit. Then, in order to make a flexible and reconfigurable model, auxiliary sources were used to substitute various elements in the chosen circuit. Hence, this methodology has led to obtaining a port network presentation. Furthermore, such configuration can easily be interconnected in diverse topologies to form rectenna arrays. At last, we show simulation results assuring validity and applicability of our model in the study of rectennas for wireless power transmission.
This paper presents a novel wideband and high directivity Bowtie photoconductive antenna (PCA) for THz frequency applications. The radiation properties of proposed PCA were analyzed by varying ...important design parameters, such as substrate thickness, conductor thickness, bowtie antenna width, length and gap. The optimized values of these parameters are then used to design a wideband PCA THz antenna which exhibits impedance bandwidth of 3 THz, 3 dB AR bandwidth of 6 THz, peak directivity of about 18.2 dBi and peak radiation efficiency of 98% within the operating band. To improve the directivity of the proposed antenna, a silicon-based lens is added in the structure and the effect of silicone lens on THz antenna directivity is also studied for enhanced directivity of proposed antenna. The proposed THz antenna can be a prospective candidate for future THz applications such as spectroscopy, imaging, sensing and indoor communication.
In this work a novel design of an ultra-wideband and highly directive Vivaldi photoconductive antenna (PCA) is reported for the first time for the THz sensing and imaging applications. The ...optical-to-THz conversion efficiency for the enhanced directivity
of the reported PCA is enhanced by adding a hemispherical silicon-based lens with the PCA gold electrode and quartz substrate (Epsilon r = 3.78, tan delta = 0.0001). The optimization of the antenna design parameters is performed in CST MWS for the frequency range of 1-6 THz. The design antenna has UWB -10 dB impedance and 3-dB AR bandwidths of 6 THz, maximum directivity of 10 dBi and maximum total radiation efficiency of > 40%.
In this paper, we propose to apply a technique of optimization of the convergence of the auxiliary sources method (MAS) for the problems of electromagnetic diffusion by a perfectly conducting and ...infinite obstacle. This technique is based on the use of the genetic algorithm (GA). Previous studies have shown that the convergence of the MAS solution depends on many parameters such as the number of auxiliary sources and the auxiliary distance between the real surface of the cylinder and the fictitious surface, and so on. The solution is obtained for a good choice of these parameters. In this article, the genetic algorithm is chosen to facilitate the choice of MAS parameters.
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