In this article, the design for 5G millimeter wave (mm-wave) applications of miniaturized low-profile dual-band filtering antenna with increased gain and high selectivity using moon-shaped parasitic patches and square complementary splitring resonator (SCSRR) is featured. The proposed design comprises of two rectangular stubs and two separate moon-shaped parasitic patches that operate for wideband impedance matching and the improved passband selectivity is achieved by employing an inter-digital line with SCSRR, which in turn is implemented to obtain second passband with improved dual-band selectivity. In addition, the filtering antenna's operating bands can be modified to the desired frequency range by individually tuning the inter-digital line, SCSRR size and location. The filtering antenna is designed to show that it operates at 26.5-29.5 GHz (Europe) and 37-43.5 GHz (USA) suitable for 5G mobile communication. Furthermore, the presented filtering antenna features are investigated in an antenna housing effect environment to examine the 5G mm-wave spectrum for automobile applications, whereas the radiating characteristics are examined in free space environment for experimental validation. By and large, the experimental validation reveals the four radiation nulls and dual band bandpass filter responses delivers a passband average gain of 4.2 and 4.37 dBi. The presented filtering antenna configuration exhibits dual band radiation in K a -band spectrum with constant gain, radiation efficiency and radiation pattern characteristics for 5G mm-wave band high speed automobile communication.automotive applications, filtering antenna in housing effects, parasitic patch, square complementary split ring resonator, super wideband antenna in 5G mm-wave spectrum
A single‐channel high information rate free‐space optics transmission link is presented incorporating in‐phase quadrature modulator‐based polarization multiplexed‐256‐quadarature amplitude modulation scheme. An information rate of 160 Gbit/s with 10 Gbaud symbol rate is achieved for free‐space information transmission. Advanced digital signal processing techniques at the receiver along coherent detection have been used to compensate the losses incurred by the information signal propagating the free‐space media. The transmission performance of the proposed link has been enhanced by using different optical amplifiers, that is, Erbium‐doped fiber amplifier and semiconductor optical amplifier, and their performance has been compared. The link performance is analyzed for required laser line width, launch power requirements, increasing transmission range, increasing beam divergence angle and optical power required at the receiver. Bit error rate and error vector magnitude metrics have been used to analyze the link performance. A maximum transmission of 3.9 km for clear weather atmospheric conditions is achieved. The proposed link has the potential to meet the last‐mile access needs and to provide high‐bandwidth high‐speed information links required for future fifth generation wireless communication and Internet of Things applications.
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