In this article, an ultra wideband (UWB-3.1 to 10.6 GHz) elliptical notched multi-resonance antenna with defective ground structure (DGS) with enhanced bandwidth was addressed. The enhancement of the bandwidth and multiple resonance characteristics can be achieved by arc truncation of lower edges of the patch. The matching characteristics can be improved by elliptical notch in the patch and DGS. The antenna covered UWB and resonating at multiple bands i.e.3.9 GHz (Worldwide Interoperability forMicrowave Access (WiMAX)), 5.72 GHz (WirelessLocal Area Network/High Performance RadioLocal Area Network2 (WLAN/HIPERLAN2)), 8.5GHz (satellite Up-Link), 12.5 GHz (Broadcastingsatellite down region I and II) and 14.8 GHz(Broadcasting satellite Up- Link).It is operating inthe frequency range of 2 to greater than 15 GHz(i.e. Bandwidth > 13 GHz). The patch was designedon the top of FR-4 substrate and is excited by a 50Ohm microstrip line. A partial defected groundstructure was printed in the back of the substrate.The proposed structure was designed and simulatedby Microwave Studio Computer SimulationTechnology (MS CST) .By observing the return loss(S11<-10dB), voltage standing wave ratio (VSWR <2), radiation patterns (Omni-directional), gain (< 5dB) and bandwidth, the performance of theantenna can be estimated. The simulated andmeasured results were compared, and the resultsare validated to justify the applicability of theproposed antenna. The parametric analysis of theantenna has been carried out by varying variousparameters.

This paper design and analyses the performance of various hexagonal-shaped metamaterial structures used in the design of band-stop filters (BSFs). This is a comparative study of metamaterial-based BSFs using different resonators like Hexagonal Split Ring Resonator (HSRR), Hexagonal Metamaterial Cell (HMC) or Novel Hexagonal Metamaterial Cell (NHMC). According to IEEE 802.11 standards, the proposed design of the BSF for the 2.4 and 3.6 GHz frequency bands for WLAN and Wi-Fi applications. The proposed NHMCbased BSF shows a reduction in overall size by up to 35%—compared to the HSRR- and HMCbased filters—and a good rejection level of up to 26 dB.The proposed NHMC-based filter design is unique because it is compact and presents sharp rejection and low insertion loss (IL) when compared to previous literature. There is good agreement between the fabricated and the measured results.

This paper proposes, a 2x2 circularly polarized multiple-input multiple-output antenna with improved impedance bandwidth, axial ratio bandwidth, larger gain, and high isolation. The proposed antenna is used in the design of a compact multi-port multi-element antenna array for Massive MIMO Base Station applications at 5.5GHz. The proposed antenna has four ports and plays an important role in implementing 5G. The proposed hexagonal patch antenna is designed using a suspended substrate technique in which an air gap between ground and substrate is varied to achieve the different bands of 10 dB bandwidth, 3 dB BW, and gain as compared to the previously published methods in the literature. The impedance bandwidth (S11 < -10 dB) over a useful frequency spectrum of 5.18 to 5.86 GHz which covers (5.15-5.35 and 5.72-5.87 ) GHz and (5.48-5.72) GHz frequency band for WLAN and Wi-MAX application respectively. The proposed antenna has an impedance bandwidth of 680 MHz (12.36%), axial ratio BW of 470 MHz (8.54%), and a gain of more than 7.67 dBi per port. Envelope correlation coefficient < 0.2, diversity gain > 9.8 dBi, and radiation efficiency of 93% are achieved over the working frequency range. The mutual coupling between antenna elements is less than -22(S21) to -31 dB(S41) for the center-to-center spacing of 0.65?, where ? is the signal’s wavelength. The CP MIMO antenna is the ultimate candidate for massive MIMO base station application.

This paper presents a novel compact 4x4 peace-shaped multiple-input multiple-output antenna (MIMO) for 5G Sub 6-GHz wireless applications. The proposed antenna consists of a peace-shaped radiating element, feedline, partial ground, and four T-shaped parasitic strip lines. This design is made of a low-cost & low-profile FR4 substrate with dimensions of 44mm x 44mm x1.6 mm. It is designed using the space diversity technique, four antenna elements are adjusted at the corners of the PCB. This arrangement provides good isolation among antenna elements without using any extra decoupling structure. Four T-shaped parasitic strip lines are placed between antennas to simultaneously offer high bandwidth and good impedance bandwidth. The proposed antenna is simulated and designed using the Ansys HFSS tool. This presented MIMO antenna radiates from 3.69 GHz to 6.53 GHz (Sub-6 GHz) 5G band with a fractional bandwidth of 55.6%. Moreover, the MIMO antenna simulated and measured parameters like CCL and ECC are found within the limits.   The proposed antenna can be useful for n79 5G NR sub-6 GHz/Wi-Fi-5/V2X/DSRC/Wi-Fi-6 applications.

This research presents a compact triple-band bandpass filter for 5G applications. Two types of resonators are used to achieve the proposed filter performance. The first resonator is a U-shape. The second and third resonators are folded half guided wavelength resonators resonating at 2.63 GHz, 3.43 GHz, and 4.66 GHz, respectively. The three passband frequencies can be adjusted and designed separately. A meandering structure is also proposed to miniaturize the suggested filter by 14.04% compared to its previous size. The proposed filter achieves insertion loss of -1.5 dB, 0 dB, and -1 dB, and return loss of -15.43 dB, -28.41 dB, and -25.3 dB, respectively. The EM-simulation, LC equivalent circuit, and measured results appear to be in good agreement.