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Besides amplitude, phase and polarization, wavefront is an important property of electromagnetic (EM) waves. EM waves with twisted wavefronts are known to carry orbital angular momentum (OAM). In this paper, a complementary-type metasurface is proposed to generate an OAM beam at microwave regime. Two metasurfaces that can produce OAM of order 2 and 4 are designed. By using our novel design methods,...
The MoM-GEC method is an efficient tool used to study electronic circuits at high frequencies. The major problem with this method is that the required calculation time increases with the complexity of the circuit. In this article, we propose to accelerate the MoM-GEC process by using Wave concept to improve the convergence speed of this method. For validation purposes, the new developed MoM-GEC approach...
In this paper, we propose a tunable dual-band left-handed metamaterial (LHM) implemented by embedding a variable capacitor to a single-band LHM. The proposed LHM is analyzed with equivalent circuits from both the aspects of magnetic and electric resonators. From the simulated results and the retrieved effective parameters, it is figured out that double negative characteristics are achieved at two...
In this paper, an accurate equivalent circuit model is presented for a triple frequency rejection band UWB antenna that provides the desired frequency rejection function at center frequencies of 2.92 GHz, 4.06 GHz and 5.28 GHz. The extraction of the equivalent circuit model of the presented antenna mainly depends on the impedance characteristic of electromagnetic (EM) simulation. The equivalent circuit...
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