Mohamed Mamdouh M. Ali

Four-element dual-band printed slot antenna array for the future 5G mobile communication networks

In this article, a four-element dual-band printed slot antenna array for the future fifth generation (5G) mobile networks is proposed. The antenna element has a compact with size of 0.8 λ0 × 0.75 λ0 at 28 GHz. The simulated results show that the designed antenna has a dual-band function at 28/38 GHz that covers future 5G applications. The designed 1-to-4 modified Wilkinson power divider is used to feed the proposed array. For further enhancement of the designed power divider, an electromagnetic bandgap (EBG) structures are used. The proposed antenna array provides directional patterns, relatively flat gain, and high radiation efficiency through the frequency band excluding the rejected band.

Design of a 28/38 GHz dual-band printed slot antenna for the future 5G mobile communication Networks

In this article, a dual-band printed slot antenna for the future fifth generation (5G) mobile networks are proposed. The antenna is compact with size of 0.8 λ0 × 0.75 λ0 at 28 GHz. Matching between a sector-disk shaped radiating patch and the 50-Ω microstrip line is manipulated through aproximity-feed technique. An elliptically shaped aperture is etched in the ground plane to enhance the antenna bandwidth. A shunt stub is used to get more enhancement of the impedance bandwidth of the antenna. To reduce the interference between the 5G system and other systems, π-shaped slot is etched off in the feed line to create a notched band of 30-34 GHz. The simulated results show that the designed antenna has a dual band function at 28/38 GHz that covers future 5G applications. The proposed antenna provides almost omni-directional patterns, relatively flat gain, and high radiation efficiency through the frequency band excluding the rejected band.

A Design of Miniaturized Ultra–Wideband Printed Slot Antenna with 3.5/5.5 GHz Dual Band–Notched Characteristics: Analysis and Implementation

A design and analysis of a novel proximity-fed printed slot antenna with 3.5/5.5GHz dual band-notched characteristics are presented. To obtain an ultra-wideband (UWB) response, a circular patch with a rectangular conjunction arm is etched concentrically inside a ground plane aperture. The antenna is proximity-fed by a microstrip line with an open shunt stub on the other side of the substrate. The designed antenna satisfles a i10dB return loss requirement in the frequency band from 2.7 to 17GHz. In order to obtain dual band-notched properties at 3.5 and 5.5GHz, an open ring slot is etched ofi the circular patch and a …-shaped slot is etched ofi the microstrip feeding line, respectively. A curve fltting formulation is obtained to describe the in∞uences of the notched resonators on the corresponding notched frequencies. The proposed antenna is designed, simulated and fabricated. The measured data show a good agreement with the simulated results and the equivalent circuit results through the use of a modifled Vector Fitting technique for a rational function approximation. The proposed antenna provides almost omnidirectional radiation patterns, relatively ∞at gain and high radiation e-ciency over the entire UWB frequency excluding the two rejected bands.

B2. Broadband millimeter-wave rectangular reflectarray antenna utilizing novel polarization insensitive multi-resonant unit cells

A new broadband millimeter-wave reflectarray antenna structure utilizing novel polarization insensitive multi resonant unit cells is proposed. The design frequency of the RA is set at 30 GHz, and it consists of 20×20 polarization independent insensitive resonant unit cells (UCs), which are illuminated by pyramidal horn antenna. The unit cell of this array contains two concentric rings combined with a cross loop and cross strips inside for bandwidth enhancement. For maximum aperture efficiency and realized gain, a pyramidal horn antenna placed at F to obtain F/D=0.4. The simulation results show that the obtained maximum gain is 23.8 dB with a slight variation over the operating frequency range and a good cross-polarization level.

A millimeter-wave circular reflectarray antenna for future 5G cellular networks

A new broadband millimetre-wave reflectarray antenna structure utilizing novel polarization insensitive multi resonant unit cells is proposed. The design frequency of the RA is set at 30 GHz, and it consists of 20×20 polarization independent insensitive resonant unit cells (UCs), which are illuminated by pyramidal horn antenna. The unit cell of this array contains two concentric rings combined with a cross loop and cross strips inside for bandwidth enhancement. For maximum aperture efficiency and realized gain, a pyramidal horn antenna placed at F to obtain F/D=0.4. The simulation results show that the obtained maximum gain is 25.1 dB with a slight variation over the operating frequency range and a good cross-polarization level.

Design of compact millimeter wave massive MIMO dual-band (28/38 GHz) antenna array for future 5G communication systems

In this article, a compact millimeter wave massive MIMO dual-band (28/38 GHz) antenna array for future 5G communication systems is proposed. A compact high gain dual-band (28/38) series fed antenna array with size of (13× 20 mm2) is nominated to design the massive MIMO antenna system. The simulated results shows that the impedance bandwidth (S11<; -10 dB) is achieved around 28 GHz and 38 GHz with a high gain of 12.07 and 13.46 dB, respectively. The proposed six-sector base station will have 6 sub-sectors (array antennas) each covering a range of 40° and 30° at 28 and 38 GHz, respectively, in azimuth plane (θ).

Dual band (28/38 GHz) CPW slot directive antenna for future 5G cellular applications

A design and analysis of a 28/38 GHz dual-band CPW slot directive antenna are presented. To obtain a dual band at 28/38 GHz that covers 5G applications, chambered rectangular patches are printed on a low permittivity “εr2=2.2” grounded substrates with a 0.254-mm-thick where it is fed by a 50Ω microstrip line on the backside through a staircase rectangular apertures etched in the ground plane. The simulated results show that the designed antenna has dual band at 28 and 38 GHz for 5G system. The antenna provides almost directional patterns with acceptable gain values at both frequency band of operation.

Broadband printed slot antenna for the fifth generation (5G) mobile and wireless communications

In this paper, a broadband elliptical-shaped slot antenna for the future fifth generation (5G) wireless applications is proposed. The antenna has a compact size of 0.5λ0 × 0.5λ0 at 30 GHz. It consists of a circular shaped radiating patch fed by a 50-Ω microstrip line via proximity-feed technique. An elliptically shaped slot is etched in the ground plane to enhance the antenna bandwidth. A stub has been added to the microstrip line feed to achieve better impedance matching bandwidth of the antenna. Simulated results indicate that the proposed 5G antenna yields a broadband impedance bandwidth larger than 67% (from 20 GHz to beyond 40 GHz) for S11 less than -10 dB. The achieved bandwidth covers both future 5G bands (28/38 GHz). The proposed antenna provides almost omni-directional patterns, relatively flat gain, and high radiation efficiency through the frequency band excluding the rejected band.

An integrated 3G/Bluetooth and UWB antenna with a band-notched feature

In this article, the design and analysis of a compact slot antenna that covers 3G, Bluetooth, and the UWB bands with the standard band-notched function at 3.6 GHz are presented and investigated. A rectangular wide-slot etched off the ground plane is used to control the low operating frequency band and the impedance matching of the proposed antenna. A manipulated rectangular tuning stub is used to enhance and control the operating bandwidth at the high frequency band. The proposed antenna is fabricated and is successfully simulated and measured. The results indicate that the proposed antenna yields an impedance bandwidth of about 7.75 GHz (from 1.9 to 9.65 GHz) defined by VSWR ≤ 2 for UMTS (1.920–2.170 GHz)/Bluetooth (2.4–2.484 GHz)/3GPP (2.57–2.62 GHz), and UWB (3.1–9.65 GHz) applications with good radiation characteristics. To reduce interference between the UWB system and the WiMAX system (3.3–3.9 GHz), a U-shaped slot is employed in the microstrip feeding line to create notched band of 3.2–4.0 GHz. Furthermore, a mathematical circuit model compatible with time-domain circuit simulators, which is based on a vector fitting technique, is also illustrated to investigate the proposed antenna characteristics.

Design and implementation of reconfigurable quad-band microstrip antenna for MIMO wireless communication applications

A quad band planar microstrip-line-fed printed circuit board (PCB) antenna for different applications is introduced in this paper. The proposed antenna can be used in mobile applications such as GSM 900 and DCS-1800. It can be also used for Bluetooth and wireless local area network (WLAN) applications at 2.4 GHz. The antenna has good characteristics at 2.3 GHz and 3.5 GHz which enable it to be used for mobile WiMAX 2.3-2.4 GHz applications and Wi-Fi 2.4-2.45 GHz applications. The antenna is built on Taconic substrate with a finite ground plane on the other side of the substrate. Simulation as well as measured results shows that the antenna has good performance in all frequency bands of operation. A reconfigurable antenna is designed and simulated using PIN switches for recent communication applications such as Cognitive radio (CR). Also, a two-element antenna system is designed, simulated and measured for multiple-input-multiple-output (MIMO) applications.