International Journal of Computer Science, Engineering and Applications (IJCSEA)

International Journal of Computer Science, Engineering and Applications (IJCSEA) Vol.10, No.4, August 2020
DOI: 10.5121/ijcsea.2020.10401 1
EVALUATION OF (GPS/GLONASS) PATCH
VERSUS RF GPS (L1) PATCHANTENNA
PERFORMANCE PARAMETER
Gholam Aghashirin1
, Hoda S. Abdel-Aty-Zohdy1
, Mohamed A. Zohdy1
,
Darrell Schmidt2
and Adam Timmons3
1
Department of Electrical and Computer Engineering,
Oakland University, Rochester, Michigan, USA
2
Department of Mathematics and Statistics, Oakland University, Rochester, USA
3
Department of Mechanical Engineering, McMaster University, Hamilton, Canada
ABSTRACT
In any wireless communication network and system an antenna is an important element along the pathway
and/or propagation path of an electrical signals. An addition, antenna module is a vital component of au-
tomated driving systems, it should function as needed in dGPS, HD map correction services, and radio and
navigation systems. The main scope, objective and goal of this engineering research work involves the
evaluation and determining the performance parameter and characteristic of the dual band
(GPS/GLONASS) patch vs RF GPS L1(1.57542 GHz) passive patch antenna characteristic. FEKO simula-
tion studies are carried out to extensively compare, make an assessment and evaluate the characteristic
and performance parameter, such as the average gain and/or passive gain of the proposed antenna in the
presence of background noise. Prior to the start of the FEKO simulation studies, a physical mechanical
dimension measurements via a Digital instrumentation were conducted for the following:
Radiating Element Size: The actual length (L), and width (W)
Substrate Material Size: The substrate length (Lsub), width (Wsub), and height (h)
The proposed antenna model for GPS only patch antenna operating at 1.57542 GHz and the
GPS/GLONASS patch antenna resonating at 1.5925 GHz are developed. To be specific, this work presents
the design, modeling, determining passive gain of the RF GPS L1 passive patch vs. active GPS/GLONAS
Spatch antenna with intended targeted applications within the automotive system and space. Simulation are
undertaken to generate the RF GPS L1 passive patch and active GPS/GLONASS patch antenna structure
respectively for the sole purpose of evaluating the performance of the proposed GPS/GLONASS antenna.
Simulation are performed rather than mathematical modeling. The two antennas are also compared from
the size standpoint. The goal of this paper is to test, measure and evaluate the performance of GPS against
GPS/GLONASS antennas. Another emphasis of this paper is how to obtain the equivalent amount of total
passive gain in a GPS vs. that of GPS/GLONASS antenna.
KEYWORDS
Differential Global Position System (dGPS),Globalnaya Navigazionnaya Sputnikovaya Sistema
(GLONASS), Advanced Driver Assistance Systems (ADAS), Automated Driving (AD), Modeling, compari-
son, measurements, analysis, Radio Frequency (RF), Vector Network Analyzer (VNA), Antenna Under Test
(AUT).

2
1. INTRODUCTION
GPS constellation system that is managed and maintained by the United States Department of
Defense since the early 70s. GPS is a space base radio navigation system that supplies an esti-
mated position, velocity and timing information to a GPS antenna/receiver module on the global.
GPS system is mainly consisting of three parts, namely the space component, ground control
station and user segment.GPS constellation we have 31 fully operational satellites positioned at
an altitude of 20, 000 km (12, 427 miles) and it moves around the earth twice a day. Where each
satellite transmits ranging and navigation data on the L1 (1.57542 GHz), L2 (1.22760 GHz), and
L5 (1.17645 GHz) carrier frequencies [3].
In order to support an array of applications across various industries, wireless communication
(Satellite, Spacecraft), Missile, Mobile Devices such as a Cell Phone, Ground Reference Station,
spaces, platforms and automotive sector that requires accurate timing and precious positioning
data, messages, signals information to be deliver to a domestic and non-domestic vehicles des-
tined to USA, Canada, Mexico and European markets plus as a result of rapid growth in an auto-
motive applications related to connected services, automotive radio head unit features, functions
and navigation systems, an antenna that can receive both RF GPS L1 passive patch and active
GPS/GLONAS Spatch antenna frequencies is needed. Therefore, due to its low cost and profile
targeting applications across various sectors of automotive and non-automotive industries, the
following two proposed antennas is investigated and compared in this research work:
1) RF GPS L1 passive patch antenna
2) Active GPS/GLONAS Spatch antenna
The RF GPS L1 passive patch antenna has radiating element size of 12.25 x 12.25 mm and it
operates at the GPS L1 1.57542 GHz frequency. While on the other hand, the active
GPS/GLONAS Spatch antenna has 12.25 x 12.25 mm with resonate frequency of 1.5925 GHz.
The RF GPS L1 passive patch and active GPS/GLONAS Spatch is model, simulated, designed,
simulation results obtained and constructed on a 5.5 mm ceramic/porcelain substrate material and
ground plane length and width size for each antenna of 95 by 95 mm respectively in the
CADFEKO page were defined and antenna far field/passive gain were obtained in the
POSTFEKO environment. To be more direct, FEKO simulation software package was used to
model, simulate and design both antennas.
We are interested to know the antenna characteristic performance parameter, such as the passive
gain of the two proposed antenna. Initially, both antennas design parameters were defined, FEKO
models for each respective presented antenna were created, by creating the radiating element,
dielectric substrate, ground plane, feed pin, add a port to the created feed pin, added a voltage
source of excitation, set the simulation frequency, union antenna parts together, mesh the gener-
ated antenna model geometry followed by simulating the model by running the FEKO Solver all
within the CADFEKO environment.
POSTFEKO was used to obtain the passive gain expected results, 2D plots of simulated Far
Field, top/side view of the studied antennas and use the simulation results from the POSTFEKO
environment to compare passive gain results and determine an optimal antenna solution and make
recommendations for the automotive industries with intended applications targeting automotive
radios and navigation systems that requires GPS and GPS/GLONASS signals.

3
Upon comparing the obtained simulation results of the RF GPS L1 patch and GPS/GLONASS
patch antenna structure from the POSTFEKO environment in this research work, it was found
and concluded that the simulated results of the proposed GPS/GLONAS Santenna is a better an-
tenna solution for the automotive applications related to automotive radios and navigation sys-
tems.
An antenna could be defined as a wireless communication device or module such as a piece of
wire for radiating or receiving electromagnetic wave propagating in a communication channel,
such as guided structure transmission line and then getting transmitted into a free space and/or
vice versa in the receiving mode. Furthermore, we present the passive gain of the RF GPS only
patch and GPS/GLONASS antenna structure using FEKO electromagnetic simulation software
package, in order to support automotive applications. Plus, this study describes the modeling,
design, simulation and analysis of RF GPS only (L1) patch and GPS/GLONASS patch antenna.
According to Constantine A. Balanis, the antenna is the transitional structure between free-space
and a guiding device, for wireless communication systems, the antenna is one of the most critical
components. For the past few decade Microstrip Patch Antenna were used heavily in high per-
formance aircraft, spacecraft, satellite and missile where size, weight, cost, performance, ease of
installation, and aerodynamic profile are constraints. Low profile antennas maybe required [1] for
packaging and/or aesthetic constraints. The active GPS/GLONASS patch antennas play a signifi-
cant role in today’s modern communications, i.e. they nicely meet automotive specification re-
quirements, most antenna designers and OEMs mainly preferred and select this rectangu-
lar/square active GPS/GLONASS patch antenna, in order to mount, install, place and position it
on their production vehicles.
This research work main contribution is the RF GPS L1 passive only patch versus active
GPS/GLONASS passive gain comparison through modeling and simulation within the FEKO
(CADFEKO and POSTFEKO) environment.
The question/problem to address of how to obtain the same and/or equivalent amount of antenna
passive gain in a GPS/GLONASS versus GPS L1 antenna is the objective of this research work.
The problem has not been solved, no solution is available on the shelf.
The verification and validation of antenna characteristic performance parameter testing of pro-
posed antenna can be conducted at the automotive bench, vehicle level, and at an antenna range
with no limitations or deficiencies by using antenna measurements with a presented Antenna Un-
der Test (AUT) component, Antenna Measurement Software, DC Power Supply, Bias-Tee, and
Vector Network Analyzer (VNA). The accurate far field and/or proposed antenna passive gain
measurements can be performed fast.
1.1. Patch Antenna Geometry Photo
Figure 1 below shows the patch antenna basic structure model in general, where we have a metal-
lic rectangular radiating element, which we call it patch that is place over a dielectric substrate
material with a specific relative permittivity and at the bottom of substrate is a conducting base
layer that acts as a rectangular conducting ground plane.

4
Figure 1. Patch Antenna Structure
1.2. GPS Constellation System Photo
Figure 2. GPS Satellites Constellation
This research work is organized into six Sections. In Section 1, we highlight our Introduction
followed by a Patch Antenna skeleton geometry in general. In Section 2, we are discussing An-
tenna Performance Characteristics and set of Design Equations. In Section 3, we offer Antenna
Design, FEKO Simulation Studies, and Discussion of Results. In Section 4, we demonstrate
FEKO Design Parameters and further Simulation Results. In Section 5, we present our Findings
and Conclusions. Lastly, in Section 6, we have our Future Work Suggestions.

5
2. ANTENNA PERFORMANCE CHARACTERISTICS
In the following below are illustration of mathematical model/equations that define the antenna
gain, efficiency, directivity, input impedance, patch actual length and width dimension.
Equation 1Expresses, the Antenna Gainas:
Also, Antenna Gain is defined in terms of Antenna Efficiency and Antenna Directivity according
to Fawwaz T. Ulaby:
where g=antenna gain, ε=antenna efficiency, and d=antenna directivity
Equation 2Expresses the Antenna Radiation efficiency as follows:
Where P rad=Radiated Power, Pt=Transmitter Power
In general, the overall Antenna Efficiency can be express as below
Where eO=Total Efficiency (dimensionless)
ec= Conduction Efficiency (dimensionless)
Γ= Voltage reflection coefficient at the input terminals of the antenna
ed= Dielectric Efficiency (dimensionless)
Equation 3 Expresses, the Antenna Directivity
Where Ωp= Pattern Solid Angle = ∬ 𝐹(𝜃, 𝜑)
4𝜋
(d Ω) and
F(θ, φ) = Normalized Radiation Intensity = (Elevation Angle, Azimuth Angle)
Equation 4Highlights, the Antenna Input Impedance, defined as:

6
Where ZA = antenna impedance at the input terminals of an antenna when it operates in transmit-
ting mode (ohms)
RA = antenna resistance at the input terminals of an antenna when it operates in transmitting mode
(ohms)
XA = antenna reactance at the input terminals of an antenna when it operates in transmitting mode
(ohms)
In general, the RA parameter from below Equation is mainly made up of two resistances (Rr and
RL) of the antenna
Where
If we assume that the antenna is connected/attached to a signal/function generator/source with
internal impedance, when the antenna is used in the transmitting mode of operation then internal
impedance is defines as listed below:
Where
solving these equations above at high level will permits to obtain the some of the antenna charac-
teristics. where on the other hand feko simulator/simulation software package is based on the
method of moments (mom) integral formulation of james maxwell’s equations, in order to solve
for antenna characteristics, such as antenna gain, antenna input impedance, etc.
per constantine a. balanis the following simplified rectangular patch antenna equations and for-
mulas can be utilized to design microstrip antenna for a given relative permittivity and/or dielec-
tric constant of the substrate material (epsilon r, εr), the resonate frequency (fr), and the substrate
height (h):
Equation 5 Determine the patch width W:
Where v0= The velocity of light in free-space (Constant value)
fr = The resonant frequency
𝜀𝑟 = The dielectric constant of the substrate

7
Equation 6 Determine the actual patch length L:
Where ∆𝐿= The extended incremental length of the patch =
fr = The resonant frequency
Equation 5 and equation 6 above allows for the computation of a rectangular microstrip antenna
mechanical dimensions such the actual patch length and width for the purpose of a practical de-
sign of patch antenna
3. ANTENNA DESIGN AESSESSMENT SIMULATION AND DISCUSSION OF
RESULTS
The testing, experimental, comparison and evaluation of the square RF GPS only passive patch
and active GPS/GLONAS Spatch antenna design and simulation of the proposed two antennas is
performed using FEKO which has not been previously investigated and/or studied at the FEKO
simulation level. The RF GPS only passive patch and active GPS/GLONASS patch antenna will
be compared and contrasted mostly from the total passive gain in FEKO simulation environment
viewpoint. The photo of each of the respective two test and presented antennas under evaluation
and assessment are outlined and shown in Figure 3, Figure 4, Figure 5, and Figure 6. Figure 3
depicts the Front View of the dual band active GPS/GLONASS antenna. From the Figure 4 we
can see the Top View of the dual band active GPS/GLONASS antenna. Figure 5 depicts the Front
View of the RF GPS only L1 square/rectangular passive patch antenna. From the Figure 6 we can
see the Top View of the RF GPS only L1 square/rectangular passive patch antenna.

8
3.1. Active GPS/GLONASS Patch Antenna Front View Photo
Figure 3. Dual Band Constellation Active GPS/GLONASS Patch Antenna
3.2. Active GPS/GLONASS PatchAntenna Top View Photo
Figure 4. Dual Band Constellation Active GPS/GLONASS Patch Antenna
3.3. RF GPS Only Passive Patch Antenna Front View Photo
Figure 5. RF GPS Only Passive Patch Antenna

9
3.4. RF GPS Only Passive Patch Antenna Top View Photo
Figure 6. RF GPS Only Passive Patch Antenna
3.5. RF GPS Antenna Samples Consideration for the Evaluation
Table 1. One sample of each antenna used for the model simulation in the FEKO environment
Dual-Band Active GPS/GLONASS
Patch Antenna
1
RF GPS Only Passive Patch Anten-
na
1
3.6. Range of Operating and Simulation Frequency Requirements
The active GPS/GLONASS patch, RF GPS Only L1 passive patch antenna frequencies were used
for the purpose of this paper test and simulation activities:
 RF GPS Only L1 passive patch antenna Frequency, GPS (L1): 1.57542 GHz
 Active GPS/GLONASS patch antenna: 1575 to 1610 MHz, Center Frequency
(fc)= 1.5925 GHz)
The proposed antennas [RF GPS L1 Passive Patch and active GPS/GLONASS] patch antenna
characteristic was simulated by using FEKO simulation software package. An analysis was con-
ducted next and finally total gain for each of the sample antenna were observed from the
POSTFEKO environment.
4. FEKO DESIGN PARAMETERS AND SIMULATION RESULTS
We initially performed and conducted the proposed two antennas physical dimension measure-
ments of patch length/width, substrate length/width/height followed that by antenna modelling,
simulation and data results analysis activities within the CADFEKO and POSTFEKO software
package domain for the following antenna samples:
 RF GPS Only L1 passive patch antenna
 Active GPS/GLONASS patch antenna

10
4.1. Antenna Samples for FEKO Simulation
Table 2. Antenna substrate and radiating element dimensions
Patch Size & Application Reference & Device Under
Test (DUT) Antenna
RF GPS L1 Only Single Passive Patch Antenna (L1-,
1.57542 GHz)
 Substrate Size: 24.9 x 24.8 x 4.5 mm
 Radiating Element Size: 12.25 x 12.25
mm
Reference
Dual Band Active GPS/GLONASS Antenna (1.5925
GHz)
 Substrate Size: 24.7 x 24.7 x 4.5 mm
 Radiating Element Size: 12.25 x 12.25
mm
DUT
4.2. Design Parameters within FEKO Simulation Environment
Table 3. FEKO Mesh and Loss Tangent Parameters for RF GPS only Passive Patch and Active
GPS/GLONASS Patch Antenna
RF GPS and GPS/GLONASS
Antenna Component
Parameter Value
RF GPS only Passive Patch An-
tenna Operating at , 1.57542 GHz
Mesh-Wire Segment Ra-
dius
1.587e-3 mm
Dielectric Loss Tangent
for Porcelain Material
2.1e-14 mm
Active GPS/GLONASS Patch An-
tenna Operating at 1.5925 GHz
Mesh-Wire Segment Ra-
dius
1.569e-3 mm
Dielectric Loss Tangent
for Porcelain Material
2.0e-14 mm
4.3. Reference RF GPS Only L1 Passive Patch Antenna
Modeling, design, and simulation based on the following design parameters listed in Table 4
below.
Table 4. Design Parameters of Reference RF GPS only Passive Patch Antenna Structure
Parameter Value
Feed Length 0.5 mm
Operating Frequency 1.57542 GHz
Ground Plane Length 95 mm
Ground Plane Width 95 mm
Radiating Element Length 12.25 mm
Radiating Element Width 12.25 mm
Substrate Length 24.8 mm
Substrate Width 24.9 mm
Substrate Thickness 4.5 mm
Substrate Dielectric Constant (Relative
Permittivity) for Ceramic/Porcelain Material
5.5 mm

11
Figure 7outlined below indicates the CADFEKO RF GPS patch antenna model that is pin fed
voltage source of excitation (1 V, 50 Ω) Top View, Figure 8plot below shows graphic representa-
tion of the Cross Section Image of the GPS only (L1 frequency, 1.57542 GHz) passive patch an-
tenna on a finite square/rectangular orange color ground plane, square purple color substrate with
dielectric constant value of 5.5 mm and a square dark blue color radiating element created in
POSTFEKO. Figure 9 and Figure 10 depict the Front and Side View of the RF GPS only passive
patch antenna generated in the POSTFEKO environment.
Figure 7. RF GPS Patch antenna operating at 1.57542 GHz (Top View-CADFEKO v2020)
Figure 8. RF GPS Patch operating at 1.57542 GHz (Cross Section Image-POSTFEKO v2020)
Orange Color=Ground Plane
-Purple Color=Substrate
-Dark Blue=Radiating Ele-
ment

12
Figure 9. RF GPS Passive Patch operating at 1.57542 GHz (Front View-POSTFEKO v2020)
Figure 10. RF GPS Passive Patch operating at 1.57542 GHz (Side View-POSTFEKO v2020)
4.4. Simulated Far Field of Reference RF GPS only Structure Passive Patch
Antenna
Figure 11. Patch antenna operating at 1.57542 GHz rectangular plot
Using Figure 11, the passive gain is approximately 3.791dBi of the presented antenna and it can be
determined by taking the difference in gain angle/delta between 30 and 90 degree angles in the 2D
plot graphic.

13
Figure 11 shows the simulated passive gain of the proposed antenna and we selected substrate
material to be Ceramic/Porcelain with dielectric constant/relative permittivity=5.5 mm to model,
design, and simulate the presented RF GPS (L1) only passive patch antenna.
4.5. Device Under Test (DUT) Active GPS/GLONASS Patch Antenna
Modeling, design, and simulation based on the following design parameters listed in table 5 be-
low.
Table 5. Design Parameters of Device Under Test (DUT) Active GPS/GLONASS Structure Patch Antenna
Parameter Value
Feed Length 0.5 mm
Operating Frequency 1.5925 GHz
Ground Plane Length 95 mm
Ground Plane Width 95 mm
Radiating Element Length 12.25 mm
Radiating Element Width 12.25 mm
Substrate Length 24.7 mm
Substrate Width 24.7 mm
Substrate Thickness 4.5 mm
Substrate Dielectric Constant (Relative
Permittivity) for Ceramic/Porcelain Material
5.5 mm
Figure 12 plot shows the Top View of the active GPS/GLONAS Spatch antenna geometry with a
square/rectangular orange color ground plane, square purple color substrate with dielectric con-
stant value of 5.5 mm and a square dark blue color radiating element where the model was creat-
ed in CADFEKO. Figure 13, Figure 14, and Figure 15 depicts the Cross Section View, Front
View, and Side View respectively of the active GPS/GLONAs Spatch antenna within the
POSTFEKO environment.
Figure 12. GPS/GLONASS Patchoperating at 1.5925 GHz(Top View-CADFEKO v2020)

14
Figure 13. GPS/GLONASS Patch operating at 1.5925 GHz (Cross Section-POSTFEKO v2020)
Figure 14. GPS/GLONASS Patch operating at 1.5925 GHz (Front View)
-Orange Color=Ground Plane
-Dark Blue=Radiating Element-

15
Figure 15. GPS/GLONASS Patch operating at 1.5925 GHz (Side View)
4.6. Simulated Far Field of GPS/GLONASS Structure Patch Antenna
Figure 16. Patch antenna passive gain at 1.5925 GHz rectangular plot
In the 2D model plot from Figure 16, we can see about 0.85dBi passive gain, by taking the differ-
ence in gain between 30 and 90 degrees.
Figure 16 simulated the passive gain of the proposed antenna and we selected substrate material
to be Ceramic/Porcelain with dielectric constant/relative permittivity=5.5 mm to model, design,
and simulate the presented GPS/GLONASS patch antenna.
5. CONCLUSION
This paper describes the GPS (L1 1.57542 GHz) frequency)patch antenna performance and com-
pares it to that of GPS/GLONASS patch antenna with ceramic/porcelain substrate material. These
two antennas can be used in modern automotive applications. The models for each antenna were
developed and then simulated on FEKO. The performance characteristic, such as passive gain in
dBi were found, 3.791 dBi for GPS and 0.85 dBi for GPS/GLONASS delta between 30 and 90
degrees. The simulated results show an improved passive gain for the antenna. Thus, the pro-
posed GPS/GLONASS will meet the needs of future automotive applications in robust way
.Furthermore, other characteristics such as wide band width and efficiency are examined.

16
6. FUTURE WORK SUGGESTIONS
In future work this presented antenna can be modified, further studied and simulated in each of
the following manners:
 The substrate material type can be changed from ceramic/porcelain to non-ceramic ver-
sion/variant.
 The proposed antenna performance can be further improved by selecting a thick substrate
whose relative permittivity is in the lower/smaller value than the presented dielectric con-
stant of 5.5 mm.
 The mechanical dimensions of each antenna can be altered and simulated, in order to en-
hance antenna major performance parameters, such as Directivity, Impedance, Current and
Polarization.
 The verification, validation and testing of the proposed RF GPS only patch and
GPS/GLONASS patch antenna component can also be conducted at the system vehicle
level, where each of the presented antenna can be installed and mounted on an optimal ve-
hicle roof location area prior to the start of the testing and antenna performance parameters
experimental measurement can be ascertained.
 The testing, assessment and evaluation of the presented RF GPS only (L1 1575.42 MHz
frequency) and GPS/GLONASS patch antenna can be carried out in Anechoic Chamber
and/or Indoor Antenna Range, in order to measure the basic antenna performance parame-
ters and/or characteristics, such as Radiation Pattern, Radiation Efficiency, Directivity, Im-
pedance, Polarization and Current draw and/or Antenna Surface Current.
REFERENCES
[1] Constantine A. Balanis, Antenna Theory Analysis and Design, 2nd ed., New York: Wiley, 1997, p. 1-
3, 58-61, 73-77, 722-750, 839-871
[2] Fawwaz T. Ulaby, Fundamentals of Applied Electromagnetics, 2001 Media Edition, Prentice Hall,
p.347-354
[3] Wikipedia, https://www.wikipedia.org
AUTHORS
Gholam Aghashirin graduated from Ryerson University, Toronto, Ontario Canada
with a B.Eng. in Electrical, Electronics and Communication Systems, earned his
M.Sc. in Electrical and Computer Engineering from Oakland University, Rochester,
Michigan, USA and he is currently a Ph.D. candidate in Electrical and Computer
Engineering at Oakland University, Rochester, Michigan, USA. He has worked as
an Engineer in advanced engineering projects, assignments in the automotive indus-
tries at various level of complexity and leadership roles in the field and space of
Global Telematics, Automotive Radio Head Units, Navigation Systems, Instrument
Clusters, Voice Recognition, Dialog, Hands-Free Systems, Electrical and Electron-
ics ADAS and Automated Driving L2 and L3 Systems. His research interests in-
clude Electromagnetics, Location Technologies, antenna design, modeling, simulations at the component,
vehicle level, antenna range and antenna experimental measurements.
Hoda S. Abdel-Aty-Zohdy received the B.A.Sc. degree (with First Class Honors)
in Electrical and Communications Engineering from Cairo University, the M.A.Sc
and Ph.D. degrees in Electrical Engineering from the University of Waterloo, ON,
Canada. Dr.AbdelAty-Zohdy is a Professor of Electrical and Computer Engineer-
ing, The John F. Dodge Chair Professor of Engineering, 2012-2014; Director of the

17
Microelectronics & Bio-Inspired Systems Design Lab at Oakland University, Rochester, MI, USA. Her
research and teaching focus on Circuits, Devices, VLSIC, H/W deep-learning, Electronic-Nose, and Bio-
Inspired IC chips for high fidelity classifications. She organized, chaired, served on several conferences
and committees for the IEEE/CASS and as Distinguished Lecturer 2004-2006,
Adam Timmons received the Ph.D. degree in Materials Science from Dalhousie
University, Halifax, Nova Scotia, Canada. Dr. Timmons is a Adjunct Professor
within the Department of Mechanical Engineering at McMaster University, Hamil-
ton, ON, Canada. He has many professional and academic appointments and holds
a large number of patents.
Mohamed A. Zohdy received the B.A.Sc degree in Electrical Engineering from
University of Cairo, the M.A.Sc and Ph.D. (Medal) from the University of Water-
loo, ON, Canada. Dr. Mohamed is a Professor of Electrical and Computer Engi-
neering at Oakland University, Rochester, MI, USA. Professor Zohdy research
focus is in the area of Advanced control and estimation, intelligent npattern infor-
mation processing, neural, fuzzy, evolutionary systems, chaos control, smart simu-
lation, hybrid systems.

International Journal of Computer Science, Engineering and Applications (IJCSEA)

More Related Content

Similar to International Journal of Computer Science, Engineering and Applications (IJCSEA) (20)

Recently uploaded (20)

International Journal of Computer Science, Engineering and Applications (IJCSEA)