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University of Engineering and Technology, Taxila


UET Taxila


RESEARCH AREAS

Microwave, Antenna and Propagation

Principal Investigator: Dr. Rashid Saleem

Research Themes

• Frequency-Selective Surfaces (FSSs)
• UWB-MIMO Antennas.
• UWB Band Filtering
• Multi Resonant PIFA Antennas
• PIFA-MIMO Antennas
• DRAs (Dielectric Resonant Antennas).
• 3-D Ray- Tracing based UWB Indoor Channel Modeling.
• Electromagnetic Interference (EMI): Modeling and performance evaluation of wireless technologies under the EMI.

Software
• HFSS v15.0
• FEKO v6.0
• CST Microwave Studio

Summary
The Microwave, Antennas and Propagation (MAP) group’s research interests are focused on the design and testing of miniature antennas, planar and PIFA included, with special emphasis on UWB band filtering, multi resonance structures, fractal antennas and MIMO application. UWB technology covers spectrum of 3.1-10.6 GHz which overlaps with WLAN, WiMAX, and X-Band downlink satellite, interface with these services is inevitable. However, interference can be eliminated by incorporating band notch techniques.
Frequency-Selective Surfaces (FSSs): FSSs find wide-spread applications which include but are not limited to microwaves filters and radar absorbing screens. Therefore, FSSs have been the subject of extensive studies in recent years. These surfaces comprise periodically arranged metallic patch elements or aperture elements within a metallic screen and exhibit total reflection or transmission in the neighborhood of the element resonance. The reflection or transmission band is achieved based on a particular configuration. In particular AFA-based FSSs exhibit superior frequency selectivity and simpler profiles than conventional FSSs. Our research group’s current focus includes design and characterization of miniature FSSs for mobile-friendly buildings.

MIMO Antennas:
Employing Multiple Input Multiple Output (MIMO) antennas, is one of the effective ways to enhance channel capacity of a communication system. The size of a mobile handset is usually very compact in which antenna elements are close located. However, due to close proximity the MIMO elements are strongly coupled to each other. This undesired coupling reduces the channel capacity of the overall communication system. Thus, it is non-trivial to maintain a good isolation between antenna elements while maintaining a compact size of the system. The research group’s current focus also includes decoupling of MIMO antenna elements on multitude of configurations.

DR Antennas:
Dielectric Resonator Antennas (DRAs) are fabricated from low-loss dielectric materials having dielectric constant more than 20. DRAs are 3-D antennas that offer designers more degrees of freedom than planar antennas. DRAs over advantages of small size, lightweight, low profile, and low cost. They have been demonstrated to be practical elements for antenna applications and have several merits including high radiation efficiency, simple geometry, and compactness. Interestingly, crystal and glass artworks can be employed as DRAs. This is useful when metallic antennas are not wanted for aesthetics. MAP research group also focusses on design and characterization of aesthetic DRAs.
3-D Ray-Tracing based UWB Channel Modelling: Indoor UWB channel modelling is important to many. UWB channel modelling has two different aspects i.e. temporal and spatial. UWB channel modelling based on high resolution 3-D ray-tracing has recently attained a lot of research attention. Our research group is heavily involved in exploring the dynamics of indoor UWB channel modelling.

Electromagnetic Interference (EMI): On a wireless link, technology specific as well as generic interference may cause considerable performance degradation. Other location based equipment generated spurious electromagnetic interference (EMI) signals, such as personal computer noise comprising of clock harmonics, are also proven in to have a potential for significant performance degradation. Research focus of our group also includes stochastic modelling of system performance under wide sense generic interference.

Group Members

• Engr. Muhammad Bilal
• Engr. Tayyab Shabbir
• Engr. Hammad Hameed Abbasi
• Engr. Kashif Khalil
• Engr. Irum Jafri
• Engr. Ayesha Shaikh
• Engr. Annum Mushtaq
• Engr. Muddasar Nauman
• Engr. Muhammad Idrees

Publications

  • R. Saleem and A. K. Brown, “Empirical Miniaturization Analysis of Inverse Parabolic Step Sequence Based UWB Antennas,” Progress In Electromagnetics Research, Vol. 114, 369-381, 2011.
  • Nayab Gogosh, M. Farhan Shafique, Rashid Saleem, Imran Usman and A. M. Faiz, “An UWB diversity antenna array with a novel H-type decoupling structure,” Microwave and Optical Technology Letters, Vol. 55, Issue 11, 2715–2720, 2013.
  • Hassan A. Khan, Ali A. Rezazadeh and Rashid Saleem, “Impact of Collection Efficiency on the Optical Responsivity of Lattice Matched InP/InGaAs Heterojunction Phototransistors,” Japanese Journal of Applied Physics, Vol. 51, 2012.
  • Allam Mousa and Rashid Saleem “ Using Reduced Interference Distribution to Analyze Abnormal Cardiac Signal,” Journal of Electrical Engineering Elektrotechnický casopis (JEEEC), Volume 62, Issue 3, pp.168-172, 2011.

    Conference Publications
  • R. Saleem, K. A. Hamdi, and A. K. Brown, “Performance Analysis of Multiband
    OFDM in a Homogeneous Poisson Field of Generic Interferers,” in Personal,
    Indoor and Mobile Radio Communications, 2009 IEEE 20th International
    Symposium on, pages 1988-1991, sept. 2009.
  • R. Saleem and A. K. Brown, “Inverse Parabolic Step Sequence Ultra Wideband
    Antenna,” in Antennas and Propagation Conference (LAPC), 2009 Loughborough, pages 773-775, nov. 2009.
  • R. Saleem and A. K. Brown, “Electrically Small Band-notch Reflected
    Inverse Parabolic Step Sequence Ultra Wideband Antenna,” in Antennas and
    Propagation (EuCAP), 2010 Proceedings of the Fourth European Conference
    on, april 2010.
  • R. Saleem and A. K. Brown, “Miniature Inverse Parabolic Step Sequence Damped Sinusoid Antenna for DS-UWB,” in Antennas and Propagation Conference
    (LAPC), 2010 Loughborough, pages 569-572, nov. 2010.
  • H. Mahmoud, A. Mousa, R. Saleem, “Kalman filter channel estimation based on comb-type pilots for ofdm system in time and frequency-selective fading environments,” IEEE MIC-CCA (Mosharaka International Conference on Communications, Computers and Applications), 2008 (Aug.), Amman, Jordan.
  • A. Mousa and R. Saleem, “The shortage of WVD in analyzing abnormal ECG signal,” in ISIEA (IEEE Symposium on Industrial Electronics and Applications), 03-06 Oct. 2010, Penang, Malaysia.
  • M. M. Ahmed, O. Awan, R. Saleem, “I-V Model for Short-Gate Length GaAs MESFET’s Characteristics,” in IEEE INMIC, 1998, LUMS, Lahore, Pakistan.
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Faculty

 

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University of Engineering and Technology Taxila, Department of Telecommunication Engineering, 051 9047917
 

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