Metamaterials microstrip patch antenna for wireless communication RFID technology

Abstract

This article is specialized to highlight the method of miniaturization and improvement the patch antenna using the complementary metamaterial. This method is presented by two different techniques. The first technique is composed a structure of patch antenna integrated in its surface a cell of complementary split ring resonator. This resonator is placed at the middle of the radiating patch in parallel with the transmission line and with a variable angle of orientation. The objective is to find the ultimate angle where the best results are obtained on improving the characteristics of the considered antenna. This motif widespread at the traceability applications by wireless communication for RFID technology at the operation frequency 2.45 GHz. In the second technique, were integrated at the surface of antenna a homogeneous and periodic array of complementary split ring resonators using the same position and the supreme orientation found in early studies. The advantage of the latter technique is to indicate the effect of increasing the number of resonators on the performance patch antenna and show the specifications and characterization of each technique proportionally at the two interesting factors miniaturization and improvement. Our contribution is based on studies and empirical and theoretical tests often presented in this article. All simulation results were made by the CST Microwave Studio. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1060–1066, 2015

Improving modulation bandwidth and optical power of GaN‐based blue LED by hollow‐runway active area

“…The curves shown in Figure B reveal the relationship between response frequency and current just as in References ; that is to say, the minimum current injection density increases as the current increases, so the response frequency increases. Figure B exhibits that the response frequency of CA‐LEDs is higher than that of a single LED, and, in contrast, HRCA‐LEDs have considerable superiority in response frequency.…”

“…In this Letter, we demonstrate GaN‐based VLC LED with hollow‐runway active area, hollow‐runway current‐confined aperture structure, and ITO/graphene composite conductive layer which has an extremely high optical power (~48.65 mW) and an extremely f −3 dB (~89.2 MHz) at 50 mA. Compared with other VLC device in References , it makes the f −3 dB and optical power to the more optimization extent, which makes VLC possible to enter the Light Fidelity (LiFi) era. We also demonstrate an integrated LiFi device with a communication module using our LEDs and a lighting module consisting of rectangle LEDs.…”

“…Liao et al reported a green GaN‐based LED with an aperture diameter of 75 μm with a 3‐dB modulation bandwidth ( f ‐3dB ) of 463 MHz and an optical power of 1.6 mW at 50 mA . However, its optical power was so little that they can only be used for plastic optical fiber (POF) communications . VLC is not only for data transmission communication but also for lighting.…”

“…VLC is not only for data transmission communication but also for lighting. The frequency of the previously described LED was very high and its optical power too small to make a photoreceiver work, which limited its use in VLC beyond POFs communication …”

CSRR Inspired Conductor Backed CPW-Fed Monopole Antenna for Multiband Operation

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