ORCID Profile
0000-0003-4619-9687
Current Organisation
National University of Sciences and Technology
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Walter de Gruyter GmbH
Date: 26-01-2017
Abstract: A wideband heptagonal fractal monopole antenna with coplanar waveguide feed is designed and fabricated in X-band frequency range. Comparison of heptagonal fractal monopole antennas with two different substrates to achieve optimum efficiency for UWB applications is presented. FR4 and RT/Duroid 5880 substrates are used for antenna design and fabrication. Four iterations of base shape are used. Fractal antenna has omni-directional radiation pattern. Simulated and measured results showed that monopole fractal antenna with RT/Duroid 5880 substrate has better performance than fractal antenna with FR4 substrate in terms of bandwidth and return loss. Major application area of proposed antenna is wireless body area networks.
Publisher: IEEE
Date: 08-2010
Publisher: IEEE
Date: 2015
Publisher: IEEE
Date: 11-2013
DOI: 10.1109/EMS.2013.88
Publisher: IEEE
Date: 2008
Publisher: American Scientific Publishers
Date: 2017
Publisher: Informa UK Limited
Date: 04-07-2021
Publisher: ACTAPRESS
Date: 2010
Publisher: IEEE
Date: 07-2019
Publisher: Public Library of Science (PLoS)
Date: 10-06-2022
DOI: 10.1371/JOURNAL.PONE.0268867
Abstract: The present work investigates a novel four-port, multiple-input multiple-output (MIMO), single element dielectric resonator antenna (DRA) for sub-6 GHz band. The DRA is designed and fabricated into a symmetric cross shape and fed using a coplanar waveguide (CPW) feed. A single radiator with four ports is rarely found in the literature. The -10 dB impedance bandwidth covered by the antenna is from 5.52 GHz to 6.2 GHz (11.6%) which covers fifth generation (5G) new radio (NR) bands N47 and wireless local area network (WLAN) IEEE 802.11a band. The isolation between orthogonal ports is about 15 dB while the isolation between opposite ports is 12 dB. The radiation pattern of the proposed antenna is bidirectional due to the absence of a ground plane below the DRA. The orthogonal modes excited in the DRA are T E δ 21 x and T E 2 δ 1 y through the four symmetrical CPW feeds. The simulated and measured results of the proposed design show that MIMO characteristics are achieved by pattern ersity between the ports. Due to the perfect symmetry of the design, the proposed work could be extended to MIMO array applications as well.
Publisher: IEEE
Date: 10-2009
Publisher: IEEE
Date: 12-2009
Publisher: Springer Science and Business Media LLC
Date: 11-05-2013
Publisher: IEEE
Date: 07-2013
Publisher: IEEE
Date: 10-04-2021
Publisher: Informa UK Limited
Date: 25-03-2022
Publisher: American Chemical Society (ACS)
Date: 07-08-2017
Publisher: No publisher found
Date: 2018
DOI: 10.1002/MOP.31037
Publisher: IEEE
Date: 06-2011
Publisher: IEEE
Date: 19-03-2021
Publisher: IEEE
Date: 04-2015
Publisher: Hindawi Limited
Date: 2016
DOI: 10.1155/2016/4754192
Abstract: Microwave resonators are widely used for numerous applications including communication, biomedical and chemical applications, material testing, and food grading. Split-ring resonators in both planar and nonplanar forms are a simple structure which has been in use for several decades. This type of resonator is characterized with low cost, ease of fabrication, moderate quality factor, low external noise interference, high stability, and so forth. Due to these attractive features and ease in handling, nonplanar form of structure has been utilized for material characterization in 1–5 GHz range. Resonant frequency and quality factor are two important parameters for determination of material properties utilizing perturbation theory. Shield made of conducting material is utilized to enclose split-ring resonator which enhances quality factor. This work presents a novel technique to develop shield around a predesigned nonplanar split-ring resonator to yield optimized quality factor. Based on this technique and statistical analysis regression equations have also been formulated for resonant frequency and quality factor which is a major outcome of this work. These equations quantify dependence of output parameters on various factors of shield made of different materials. Such analysis is instrumental in development of devices/designs where improved/optimum result is required.
Publisher: IEEE
Date: 12-2016
Publisher: SPIE
Date: 21-12-2007
DOI: 10.1117/12.769359
Publisher: IEEE
Date: 11-2009
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2021
Publisher: IEEE
Date: 10-2008
Publisher: IEEE
Date: 11-2013
Publisher: IEEE
Date: 11-2013
Publisher: Wiley
Date: 29-07-2015
DOI: 10.1002/MOP.29344
Publisher: UK Simulation Society
Date: 28-02-2013
Publisher: IEEE
Date: 10-2016
Publisher: Springer Science and Business Media LLC
Date: 19-11-2014
Publisher: Springer Science and Business Media LLC
Date: 11-04-2015
Publisher: IEEE
Date: 02-2010
Publisher: IEEE
Date: 12-2014
Publisher: Springer Science and Business Media LLC
Date: 26-11-2020
Publisher: IEEE
Date: 04-2013
Publisher: IOP Publishing
Date: 28-06-2010
Publisher: IEEE
Date: 12-2008
Publisher: The Electromagnetics Academy
Date: 2019
Location: Pakistan
No related grants have been discovered for Hamood Ur Rahman Khawaja.