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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