Amer fractal slot antenna with quad operating bands high efficiency for wireless communications

This article presents a 2×1 CPW ultra wideband rectangular slot antenna array (UWB-RSAA) with a modified circular slot shape to support a high data rate for wireless communications applications. The proposed antenna array dimensions are 0.7λ×0.8λo×0.064λo at the resonant frequency 1.8 GHz. It is fabricated on Rogers RO4003 substrate and fed by using a coplanar waveguide (CPW). A graphene layer is added on one side of the substrate to realize frequency reconfigurability and improve the array gain. The proposed array acquires -10 dB impedance bandwidth of the RSAA that extends from 1.7 GHz to 2.6 GHz, from 3.2 to 3.8 GHz, and from 5.2 GHz to 7 GHz. The proposed array achieved a realized peak gain of 7.5 dBi at 6.5 GHz at 0 Volt bias with an average gain of 4.5 dBi over the operating band. When the graphene bias is increased to 20 Volt, the antenna bandwidth extends from 1 GHz to 4 GHz and from 5 to 7 GHz with a peak gain of 14 dBi at 3.5 GHz and an average gain of 7.5 dBi. The linearly polarized operation of the proposed array over the operating bands makes it suitable for short-range wireless communications .

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Dual band hexagonal slot antenna for wireless communications

2017 IEEE Applied Electromagnetics Conference (AEMC) ◽

10.1109/aemc.2017.8325748 ◽

2017 ◽

Author(s):

Manas Midya ◽

Shankar Bhattacharjee ◽

Anupa Chatterjee ◽

M. Mitra

Keyword(s):

Wireless Communications ◽

Dual Band ◽

Slot Antenna

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Mobile-Phone Antenna Array with Diamond-Ring Slot Elements for 5G Massive MIMO Systems

Electronics ◽

10.3390/electronics8050521 ◽

2019 ◽

Vol 8 (5) ◽

pp. 521 ◽

Cited By ~ 7

Author(s):

Naser Ojaroudi Parchin ◽

Haleh Jahanbakhsh Basherlou ◽

Mohammad Alibakhshikenari ◽

Yasser Ojaroudi Parchin ◽

Yasir I. A. Al-Yasir ◽

...

Keyword(s):

Mobile Phone ◽

Antenna Array ◽

Massive Mimo ◽

Printed Circuit Board ◽

High Efficiency ◽

Mimo Systems ◽

Circuit Board ◽

Slot Antenna ◽

Impedance Bandwidth ◽

Diamond Ring

A design of mobile-phone antenna array with diamond-ring slot elements is proposed for fifth generation (5G) massive multiple-input/multiple-output (MIMO) systems. The configuration of the design consists of four double-fed diamond-ring slot antenna elements placed at different corners of the mobile-phone printed circuit board (PCB). A low-cost FR-4 dielectric with an overall dimension of 75 × 150 mm2 is used as the design substrate. The antenna elements are fed by 50-Ohm L-shaped microstrip-lines. Due to the orthogonal placement of microstrip feed lines, the diamond-ring slot elements can exhibit the polarization and radiation pattern diversity characteristic. A good impedance bandwidth (S11 ≤ −10 dB) of 3.2–4 GHz has been achieved for each antenna radiator. However, for S11 ≤ −6 dB, this value is 3–4.2 GHz. The proposed design provides the required radiation coverage of 5G smartphones. The performance of the proposed MIMO antenna design is examined using both simulation and experiment. High isolation, high efficiency and sufficient gain-level characteristics have been obtained for the proposed MIMO smartphone antenna. In addition, the calculated total active reflection coefficient (TARC) and envelope correlation coefficient (ECC) of the antenna elements are very low over the whole band of interest which verify the capability of the proposed multi-antenna systems for massive MIMO and diversity applications. Furthermore, the properties of the design in Data-mode/Talk-mode are investigated and presented.

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