POSTGRADUATE PROGRAM
Microwave, Antennas & Propagation Group
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
• Dr. Rashid Saleem (Principal Investigator)
• 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
Journal 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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