|Name||Dr. Aamir Rashid|
|Department||Electronics Engineering (Taxila)|
|Specialization||Electromagnetic Modelling, Antenna Design, Microwave and RF Electronics, Numerical Methods, Computational Electromagnetics|
Doctoral School: Electrical, Electronics and Telecommunications Engineering - GEET
Laboratory: Laboratory for Analysis and Architecture of Systems - LAAS-CNRS
Abstract: Large sized planar structures are increasingly being employed in satellite and radar applications. Two major kinds of such structures i.e. FSS and Reflectarrays are particularly the hottest domains of RF design. But due to their large electrical size and complex cellular patterns, full-wave analysis of these structures require enormous amount of memory and processing requirements. Therefore conventional techniques based on linear meshing either fail to simulate such structures or require resources not available to a common antenna designer. An indigenous technique called Scale-changing Technique addresses this problem by partitioning the cellular array geometry in numerous nested domains defined at different scale-levels in the array plane. Multi-modal networks, called Scale-changing Networks (SCN), are then computed to model the electromagnetic interaction between any two successive partitions by Method of Moments based integral equation technique. The cascade of these networks allows the computation of the equivalent surface impedance matrix of the complete array which in turn can be utilized to compute far-field scattering patterns. Since the computation of scale-changing networks is mutually independent, execution times can be reduced significantly by using multiple processing units. Moreover any single change in the cellular geometry would require the recalculation of only two SCNs and not the entire structure. This feature makes the SCT a very powerful design and optimization tool. Full-wave analysis of both uniform and nonuniform planar structures has successfully been performed under horn antenna excitation in reasonable amount of time employing normal PC resources.
Pre-processing and Ultra Compressed Parametric Modelling of UWB Antenna Measurements
Abstract: Complex UWB antenna design procedures have always been seen as a hindrance to the rapid growth of UWB applications. Various methodologies to simply this process have been sought over the past few years. One such domain of growing interest is “UWB Antenna Modelling”. The research in this field will not only provide a simple and concise representation of cumbersome antenna measurement data but also promises ultimately, to significantly simply UWB antenna realization techniques. The need for concise and efficient antenna models for UWB communications has been widely addressed in the past years. Yet, areas of statistical modelling for antennas lie vastly unexplored. On the other hand, statistical modelling for UWB channel is well in its mature state. Various UWB applications e.g. Body area networks (BANs) and WLANs require antenna models to include the effects due to proximity environment in which they are being used. This concept further refines to defining a class of antennas which behave similarly in similar conditions and therefore can be represented by a general model representative of the entire “antenna class”. This stochastic model can be easily interfaced with the existing stochastic models of UWB channel and therefore make the design of a UWB system simpler. This thesis addresses this topic through an approach based on a drastic reduction of the descriptive parameters set of antennas based on double projection of their Transfer Function or Impulse Response. This compression is achieved through a parametric modelling based on the Singular Expansion Method (SEM) and the Spherical Modes Expansion Method (SMEM). Extremely high data compression rates can be obtained “with losses” (i.e. to some extend at the expense of accuracy). It is also possible to achieve very high data compression rates with a good precision. The method is applied to various prototypes, focusing as a first step on small or moderate size antennas. It is shown in practice that data compression rates as high as 99.9% are achievable.
Radiator Designs: 5G Antennas
Metasurfaces: Metasurface based Polarization Converters, EM Absorbers, Wave synthesizers
Computational EM: Scale Changing Technique (SCT)
Artificial Intelligence: Deep Learning, CNNs
[B1] Aamir Rashid, “Electromagnetic Modeling of Planar Array Structures: using Scale Changing Technique (SCT)”, LAP LAMBERT Academic Publishing, Germany, July 2011, ISBN-10:3845403551.
[J10] Raza H, Zaidi SAA, Rashid A, Haider S, "An area efficient and high throughput implementation of layered min-sum iterative construction a posteriori probability LDPC decoder." PLOS ONE 16(3): e0249269. https://doi.org/10.1371/journal.pone.0249269 [IF=2.74 Q2 2020 Ranking]
[J09] Ijaz M, Zaidi SAA, Rashid A (2021) Uniform patterns based area-efficient and accurate stochastic computing finite impulse response filter. PLOS ONE 16(1): e0245943. https://doi.org/10.1371/journal.pone.0245943 [IF=2.74 Q2 2020 Ranking]
[J08] Muhammad Fahim Zafar, Usman Masud, Aamir Rashid, Mudassir Murtaza & Tariq Ullah (2021) Comment on ‘An ultrathin and broadband radar absorber using metamaterials’, Waves in Random and Complex Media, DOI: 10.1080/17455030.2020.1869350 [IF=3.33 Q1 2020 Ranking]
[J07] Ullah, T, Rashid, A. Angularly stable and broadband chiral metamaterial based design for asymmetric transmission of linearly polarized waves. Microw Opt Technol Lett. 2021; 63: 226– 234. https://doi.org/10.1002/mop.32564 [IF=0.957 Q4 2020 Ranking]
[J06] Murtaza, M, Rashid, A, Tahir, FA. A highly efficient low‐cost reflective anisotropic metasurface for linear to linearly cross‐ and circular‐polarization conversion. Microw Opt Technol Lett. 2020; 1 8. https://doi.org/10.1002/mop.32748 [IF=0.957 Q4 2020 Ranking]
[J05] Saba Arshad , Farooq A. Tahir , Aamir Rashid , M. M. Saad Missen & James A. Flint (2020) Co-planar-waveguide fed Circularly Polarized Antenna for Wireless WLAN/LTE Applications, Electromagnetics, 40:5, 354-363, DOI: 10.1080/02726343.2020.1780379 (Tylor & Francis) [IF 0.553 Q4 2020 Ranking]
[J04] Hassan Tariq Chattha, Farooq A. Tahir, Zain B. Khalid & Aamir Rashid (2020) A novel compact folded zeroth-order resonant antenna for Internet of Things USB dongle applications, Electromagnetics, 40:4, 244-253, DOI: 10.1080/02726343.2020.1750676 (Tylor & Francis) [IF 0.553 Q4 2020 Ranking]
[J03] Ejaz, F., Hamayun, M. T., Hussain, S., Ijaz, S., Yang, S., Shehzad, N., & Rashid, A. (2019). An adaptive sliding mode actuator fault tolerant control scheme for octorotor system. International Journal of Advanced Robotic Systems. Volume 16, issue 2, March 2019. [IF=1.482 Q4 2020 Ranking]
[J02] Qaisar Bashir, Muhammad Naeem Shehzad, Aamir Rashid et al, “An online temperature-aware scheduling technique to avoid thermal emergencies in multiprocessor systems”, Elsevier journal of Computers & Electrical Engineering, Volume 70, August 2018, Pages 83-98. [IF=2.663 Q2 2020 Ranking]
[J01] F. Khalil, C. Barrios-Hernandez, A. Rashid, H. Aubert et al. “Parallelization of the Scale Changing Technique in Grid Computing environment for the Electromagnetic Simulation of Multi-scale Structures”, Wiley International Journal of Numerical Modeling : Electronic Networks, Devices and Fields. Volume 24, Issue 1, pages 58–77, January 2011. (IF=0.5)
[C10] M. Murtaza, A. Rashid, T. Ullah, F. A. Tahir and S. A. A. Zaidi, "An Angularly Stable Broadband Cross-Polarization Conversion Metasurface," 2019 13th European Conference on Antennas and Propagation (EuCAP), 2019, pp. 1-3.
[C09] S. Arshad, A. Ahmad, Z. Sheikh, A. Rashid and F. A. Tahir, "A compact dual-band circularly polarized asymmetric patch antenna for WLAN applications," 2017 IEEE Asia Pacific Microwave Conference (APMC), Kuala Lumpar, 2017, pp. 952-955.
[C08] M. K. Arshad, F.A. Tahir, A. Rashid, "Design of a Single Layer Reflectarray Unit Cells Based on Hexagonal Ring for Wideband Operation", Proceedings of the 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, pp. , Jul, 2014, Memphis United States.
[C07] A. Rashid, F.A. Tahir, "Modelling Electromagnetic Scattering from Large Non-Uniform Planar Arrays", Proceedings of the 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, Jul, 2014, Memphis United States.
[C06] E.B.Tchikaya, A.Rashid, F.Khalil, H.Aubert, Maxime Romier, N.Fonseca, “Full Wave Analysis of Large Non-Uniform Metallic Grid FSS Under Oblique Incidence Using Scale Changing Technique”, Asia Pacific Microwave Conference (APMC), 7-10 December 2010, Yokohama, Japan.
[C05] F.A.Tahir, A. Rashid, E. B. Tchikaya, and H.Aubert, “Full Wave Analysis of Planar Structures using Scale Changing Technique under Feed Horn Excitation”, IEEE Antennas and Propagation Conference (LAPC), pp.445-448, 8-9 Nov 2010, Loughborough, UK.
[C04] E.B.Tchikaya, A.Rashid, F.Khalil, H.Aubert, H.Legay, N.Fonseca, “Multi-scale Approach for the Electromagnetic modeling of metallic FSS Grids of Finite Thickness with Non-uniform Cells”, Asia Pacific Microwave Conference (APMC), 7-10 December 2009, Singapore.
[C03] A.Rashid, H,Aubert, H,legay “ Modeling of finite and non-uniform patch arrays using scale-changing technique”, IEEE Antennas and Wireless Propagation Society International Symposium (APS 2009), Charleston, USA.
[C02] F. Khalil, A.Rashid, H.Aubert, F.Coccetti, R.Plana, C.Barrios-Hernandez, “Application of Scale Changing Technique - Grid Computing to the Electromagnetic Simulation of Reflectarrays”, IEEE Antennas and Wireless Propagation Society International Symposium (APS 2009), Charleston, USA.
[C01] A.Rashid, H.Aubert, N.Raveu, H.Legay, "Modeling of Infinite Passive Planar Structures using Scale-Changing Technique". IEEE Antennas and Wireless Propagation Society International Symposium (APS 2008), San Diego, July 5-11, 2008.
A.Rashid, H,Aubert, H,legay “ Scale-Changing Technique for the numerical modeling of large finite non-uniform array structures”, Progress In Electromagnetics Research Symposium (PIERS), 18-21 August 2009, Moscow, Russia.
E.B.Tchikaya, A.Rashid, H.Aubert, H.Legay,N.Fonseca, “Electromagnetic Modeling of Finite Metallic Grid FSS Structures using Scale Changing Technique”, Progress In Electromagnetics Research Symposium (PIERS), 22-26 March 2010, Xi’an, China.
A.Rashid, H.Aubert, “Modeling of Electromagnetic Coupling in Finite Arrays Using Scale-changing Technique”, Progress In Electromagnetics Research Symposium (PIERS), 5-8 July 2010, Cambridge, USA.
A.Rashid, “Computation of the Scattering Patterns of Microstrip Arrays Using Scale-changing Technique.” Progress in Electromagnetic Research Symposium (PIERS 2013), August 12-15, 2013, Stockholm, Sweden.
A.Rashid, H.Aubert, H.Legay “ Modélisation Electromagnétique d’un Réseau Fini et Non-Uniforme par la Technique par Changements d’Echelle”, Journée National Microonde JNM 2009, Grenoble, France.
A.Rashid, “Electromagnetic Modeling of large Finite and Non-Uniform Arrays using Scale-Changing Technique”, Ecole Doctorale (GEET) Day, Toulouse, 5 March 2009.
• Director Post Graduate Studies
• Lab Director Digital Signal Processing and Communications Lab
• Final Year Project Coordinator
• Convener Subject/CQI Committee
• Member Semester Committee
• Member BoUGS
• Student Advisor
Probability and Random Variables (EN-222),
Signal Processing (EN-314),
Electrical Network Analysis (EN-214),
Electromagnetic Field Theory (EN-224),
Solid-state Electronics (EN-126),
Introduction to Neural Networks (EN-435).
Electromagnetic Field Theory (EN-5004/EN-6213),
Advanced Electromagnetic Field Theory (EN-7213),
Random Processes and Statistics (EN-6002),
Random Processes (EN-5002),
Special Topics in Electronics System Design (EN-6310),
Advanced Engineering Mathematics (EN-5001)
Teaching the Teachers (A Concept Workshop): Electronic Circuits for Instrumentation and Measurement by Dr. Asad Abidi , SBASSE – EE, LUMS, June 4-7, 2012
Teaching the Teachers (A Concept Workshop): Fundamentals of Power Electronic Converters by Dr. Asad Abidi , SBASSE – EE, LUMS, December 16-20, 2012
“2013 , Workshop on Renewable Technologies and Solutions”. SBASSE-EE, LUMS, March 8, 2013. (Hosted and Organized)
Title of my talk: “Energy conservation potential through the use of variable frequency drives (VFDs)”
“I&R, Optik TV and GPON Training”, 3 week-long training workshop organized by AFL Global, Edmonton, Canada in April 2015.
“Research and Inferential Statistics – Capacity Building in Inferential Statistics and Analysis”, International Research Workshop by Research Centre for Training and Development (RCTD), 26-27 January 2017.
“Outcome-based education and Implementation”. 1st and 2nd February 2017. University of Engineering and Technology, Taxila.
“Bloom’s Taxonomy in Design & Assessment of Course Learning Outcomes”, Seminar organized by Institute of Space Technology (IST), December 20, 2017.
“Professional Ethics, Communication Skills & Micro Teaching”, organized by Staff Development Centre, March 2018, University of Engineering and Technology, Taxila.
“Writing Research Paper/Thesis in LaTeX”, organized by Electronics Engineering Department, March 13th, 2020, University of Engineering and Technology, Taxila.