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Your search keyword '"Iftikhar, Adnan"' showing total 168 results
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168 results on '"Iftikhar, Adnan"'

1. Ultra-Wideband Antenna with MIMO Diversity for 5G Wireless Communication

Author

Khan, M. Saeed, Iftikhar, Adnan, Shubair, Raed M., Capobianco, Antonio-D., Braaten, Benjamin D., and Anagnostou, Dimitris E.

Subjects
Electrical Engineering and Systems Science - Signal Processing, Physics - Applied Physics
Abstract

An eight element, compact Ultra Wideband-Multiple Input Multiple Output (UWB-MIMO) antenna capable of providing high data rates for future Fifth Generation (5G) terminal equipments along with the provision of necessary bandwidth for Third Generation (3G) and Fourth Generation (4G) communications that accomplishes band rejection from 4.85 to 6.35 GHz by deploying a Inductor Capacitor (LC) stub on the ground plane is presented. The incorporated stub also provides flexibility to reject any selected band as well as bandwidth control. The orthogonal placement of the printed monopoles permits polarization diversity and provides high isolation. In the proposed eight element UWB-MIMO/diversity antenna, monopole pair 3-4 are 180o mirrored transform of monopole pair 1-2 which lie on the opposite corners of a planar 50 x 50 mm2 substrate. Four additional monopoles are then placed perpendicularly to the same board leading to a total size of 50 x 50 x 25 mm3 only. The simulated results are validated by comparing the measurements of a fabricated prototype. It was concluded that the design meets the target specifications over the entire bandwidth of 2 to 12 GHz with a reflection coefficient better than -10 dB (except the rejected band), isolation more than 17 dB, low envelope correlation, low gain variation, stable radiation pattern, and strong rejection of the signals in the Wireless Local Area Network (WLAN) band. Overall, compact and reduced complexity of the proposed eight element architecture, strengthens its practical viability for the diversity applications in future 5G terminal equipments amongst other MIMO antennas designs present in the literature., Comment: 25 pages

Published
2020
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35. A Compact Circular Loop Inspired Frequency and Bandwidth Reconfigurable Antenna for 4G, 5G, and X- Band Applications

Author

Rasool, Maryam, Khan, Aabia, Bhatti, Farooq, Ijaz, Bilal, Iftikhar, Adnan, Rasool, Maryam, Khan, Aabia, Bhatti, Farooq, Ijaz, Bilal, and Iftikhar, Adnan

Abstract

This paper presents a printed patch antenna design to achieve frequency and bandwidth reconfigurability. Two RF PIN diodes are simultaneously operated to achieve the multi-reconfigurability operation. The patch is inspired from a circular loop design. The basic structure of loop is altered, and PIN diodes are integrated into the patch. The antenna operates in dual band configuration at 3.42 and 8.02 GHz in the diodes ‘OFF’ state, whereas the antenna switches to triple band operation at 2.21, 4.85, and 10.19 GHz in the diodes ‘ON’ state. Moreover, the antenna also exhibits an increased bandwidth from 7.54 to 12 GHz in the diodes ‘ON’ state, as compared to a narrow bandwidth from 7.71 to 8.48 GHz in the diodes ‘OFF’ state. The proposed antenna structure is implemented and fabricated using FR4 epoxy substrate of relative permittivity 4.4, and thickness 1.6 mm. Implemented design exhibits measured gains of 3.06 dBi, 2.81 dBi, and 2.92 dBi at 2.21, 4.85, and 10.19 GHz in the PIN diodes ‘ON’ state, respectively, while in the PIN diodes ‘OFF’ state, at 3.42 GHz the gain is 3.03 dBi and at 8.02 GHz the gain is 3.37 dBi. Overall, simulation results agree well with the measured results.

Published
2020

36. Ultra-compact reconfigurable band reject UWB MIMO antenna with four radiators

Author

Massachusetts Institute of Technology. Research Laboratory of Electronics, Khan, Muhammad Saeed, Iftikhar, Adnan, Shubair, Raed M., Capobianco, Antonio-Daniele, Asif, Sajid Mehmood, Braaten, Benjamin D., Anagnostou, Dimitris E., Massachusetts Institute of Technology. Research Laboratory of Electronics, Khan, Muhammad Saeed, Iftikhar, Adnan, Shubair, Raed M., Capobianco, Antonio-Daniele, Asif, Sajid Mehmood, Braaten, Benjamin D., and Anagnostou, Dimitris E.

Abstract

A compact reconfigurable UWB MIMO antenna with four radiators that accomplish on-demand band rejection from 4.9 to 6.3 GHz is presented. An LC stub is connected to the ground plane by activating the PIN diode for each radiator. Two radiators are placed perpendicular to each other to exploit the polarization diversity on a compact 25 × 50 mm 2 FR4 laminate. Two additional radiators are then fixed obliquely on the same laminate (without increasing size) in angular configuration at ±45° perpendicular to the first two planar radiators still exploiting polarization diversity. The design is validated by prototyping and comparing the results with the simulated ones. On demand band rejection through the use of PIN diodes, wide impedance matching (2–12 GHz), high isolation amongst the radiators, compactness achieved by angular placement of the radiators, low gain variation over the entire bandwidth, band rejection control achieved by adjusting the gap between stub and ground plane, and low TARC values makes the proposed design very suitable for commercial handheld devices (i.e., Huawei E5785 and Netgear 815S housings). The proposed configuration of the UWB MIMO radiators has been investigated first time as per authors’ knowledge. ©2020 keywords: band rejected; envelope correlation co-efficient; four element MIMO; polarization diversity; ultra-wideband multiple input multiple output, EU H2020 Marie Skłodowska-Curie Individual Fellowship ViSionRF (grant no. 840854), COMSATS Research Grant Program (project no. 16-63/CGRP/CUI/ISB/18/847)

Published
2020

37. Planar SIW leaky wave antenna with electronically reconfigurable E-and H-plane scanning

Author

Iftikhar, Adnan, Shafique, Muhammad Farhan, Farooq, Umer, Khan, Muhammad Saeed, Asif, Sajid Mehmood, Fida, Adnan, Ijaz, Bilal, Rafique, Muhammad Nadeem, Mughal, Muhammad Junaid, and Ur-Rehman, Masood

Abstract

This paper reports on a novel technique of switching radiation characteristics electronically between E-and H-planes of planar Substrate Integrated Waveguide Leaky Wave Antennas (SIW-LWAs). The leaky wave mode is achieved through increasing the pitch of bounding metallic via posts on one side of SIW transmission section. The radiation switching is achieved by extending the top and bottom metallic planes to a distance of 1 mm along the leakage side. The extended section acts as a parallel plate section which is conveniently connected or disconnected from the leaking side of SIW through PIN diodes. The ‘ON’ state of PIN diodes extends the metal guides and results in the H-plane leakage whereas ‘OFF’ state of PIN diodes truncates the extended metal earlier and alter the leakage line boundary condition towards E-plane. The whole concept is validated by series of simulations followed by the realization and testing of the SIW-LWA. The measured radiation pattern scans about 54° in the E-plane between 10.0 GHz to 11.7 GHz, and 58° in the H-plane from 9 GHz to 10.6 GHz. The proposed topology is a suitable candidate for remote sensing and airborne applications.

Published
2019

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