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In this paper, a reflective metasurface consists of 19 × 19 unit cells is designed, which can effectively convert general incident linear co-polarized wave to orbital angular momentum (OAM) with different modes. Using this reflective metasurface, we achieved OAM with mode 1, 2 and 3, and provides their phase and magnitude distribution in near field, as well as far field radiation pattern. Reflective...
In this paper, a 2 × 8 elements ultra-wideband tightly coupled dipole antenna array is presented. The array is constructed by placing alternate dipole elements on the opposite sides of a substrate. The array is designed to operate in the FCC frequency band for ultra-wideband (3.1 GHz to 10.6 GHz) wireless communication. The mutual coupling between the elements in the proposed array is high and it...
This paper presents a multi-mode, planar array made up of co-located elements. The array operates in dual-bands, S- and X-band, with dual-polarizations. The dual-band operation necessitates different electrical spacing between the S-band and X-band array elements. We optimize the electrical spacing by co-locating dual-band radiating elements with X-band only elements. The enabling technology for the...
This paper presents a low profile wideband antenna array of tightly coupled dipole antennas. A slot coupled wideband balun is also integrated into the array. The proposed array is designed to operate in 2 GHz – 3.7 GHz frequency band. A finite array with 7 × 7 elements is simulated to observe the radiation and input impedance performance of the antenna. In the proposed array 64.3% impedance bandwidth...
Mutual coupling is a critical issue in antenna elements is placed in the form of array between the antenna elements. In the present work Jerusalem cross periodic structure is proposed as an effective solution for reducing mutual coupling in a micro strip array antenna with more than one element. This structures have been Applied between the patches have been Simulated and verified with practical results.
In this paper, a new conception of high gain antenna have been staged. High gain antenna is designed by increasing the number of main radiating patch in a linear antenna array and studying the radiation patterns for the single patch antenna and array of 5 elements, 9 elements and 16 elements in order to attain a high directive gain for ISM Band. For many applications a high gain and directive antenna...
Multioctave Planar Phased Arrays (MPPA) have advanced rapidly since 2000. Today, MPPA technology and its market needs appear to be nearing a point of convergence. This paper reviews the history of thin MPPAs, which exclude the Vivaldi antenna type, and presents modern planar Traveling-Wave Antenna (TWA) array as a thin MPPA. The differentiating features of modern planar TWA array from other thin MPPAs,...
The isolation between antennas is a critical parameter in many practical applications such as antenna arrays, multiple input and multiple output (MIMO) communication systems, and integrated antenna systems. However, the close spacing between each of antennas generates the cross talk factor and restricts the integration of antenna system. To address the problem the authors proposed a new approach,...
Diakoptic surface integral-equation formulation is used to efficiently simulate large antenna arrays, modeled as 3D EM structures. The significant accelerations and storage reductions are achieved, when compared to the classical MoM-SIE. Both near field and far field (radiation pattern) of the arrays, calculated using DSIE, match the results calculated using MoM-SIE very well (the maximal relative...
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