Prof. J. Joubert

confidencehandElectronics - Devices

Nov 27, 2013 (3 years and 6 months ago)

93 views

1. Project number



EM18

2.
Project title:


Design of a chipless RFID tag for conveyor belt
tracking using multi
-
resonant dipole antennas

3.
Study leader:




Prof J Joubert

4.

Intended degree

programme

for this project
:


Electronic Engineering

5.
Researc
h
g
roup:




Electromagnetism

6. Nature of the project:


Design


7.
Brief description of the project

RFID technology is a data identification technology that operates wirelessly using the
transmission and reception of RF waves propagating through free space
. All RFID
systems use a transponder (tag) as the labelling device and a reader connected to a
knowledge database to interrogate the transponders and communicate with them. RFID
has become an application specific technology with many different alternatives
. When
considering low
-
cost applications of RFID such as item level tracking in warehouses and
transport vehicles the most appropriate RFID technology is chipless RFID. This is
because the cost per tag is lower than all other forms of RFID since there is n
o
microcontroller or on
-
board battery source and the tags may be fully printable.
For t
his
project
multi
-
resonant
dipole
antenna
s

have to be
utilized
to design
and construct a
6
-
bit
prototype transponder
using
full
-
wave simulations

and measurements
.

8.
Wh
at will be expected of the student

8.1 Nature of deliverables



A literature survey on chipless RFID systems and tags.



A Matlab computer code to analyze a simple dipole antenna using the Method of
Moments.



A design for a 6
-
bit prototype transponder using mu
lti
-
resonant dipole antennas with
full
-
wave simulated results.



Manufactured prototype of the transponder (tag) with measured results.

8.2 New knowledge, skills and engineering tools to be mastered by the student



The student will have to study the literatur
e to familiarize himself/herself with the
design of chipless RFID tags
,
dipole antennas

and multi
-
resonant dipole antennas.




The student will need to learn to use CST Microwave Studio (a full
-
wave
electromagnetic analysis software package).



The student wil
l need to master the theory required to design a chipless 6
-
bit
prototype transponder for a RFID system.


1. Project number



EM19

2.
Project title:


Design of a
wideband
dual
-
polarized high gain
reader antenna for a
chipless RFID
system

3.
Study leader
:




Prof J Joubert

4.

Intended degree

programme

for this project
:


Electronic Engineering

5.
Research
g
roup:




Electromagnetism

6. Nature of the project:


Design

7.
Brief description of the project

RFID technology is a data identification technology that

operates wirelessly using the
transmission and reception of RF waves propagating through free space. All RFID
systems use a transponder (tag) as the labelling device and a reader connected to a
knowledge database to interrogate the transponders and commun
icate with them. RFID
has become an application specific technology with many different alternatives. When
considering low
-
cost applications of RFID such as item level tracking in warehouses and
transport vehicles the most appropriate RFID technology is ch
ipless RFID.
For t
his
project
the student has to design a wideband dual
-
polarized high gain reader antenna for
such an RFID system,

using
full
-
wave simulations

and measurements
.

8.
What will be expected of the student

8.1 Nature of deliverables



A literatu
re survey on
wideband
dual
-
polarized high gain
antennas
.




A Ma
tlab computer code to analyze a basic antenna
.



A design for a
wideband dual
-
polarized high gain reader antenna for a chipless RFID
system

with full
-
wave simulated results.



Manufactured prototype

of the
wideband dual
-
polarized high gain reader antenna

with measured results.

8.2 New knowledge, skills and engineering tools to be mastered by the student



The student will have to study the literature to familiarize himself/herself with the
design
of wi
deband dual
-
polarized high gain reader antennas
.





The student will need to learn to use CST Microwave Studio (a full
-
wave
electromagnetic analysis software package).



The student will need to master the theory required to design a
wideband dual
-
polarized h
igh gain reader antenna

for a RFID system.

1. Project number



EM20

2.
Project title:


Design of a compact ultra
-
wideband (UWB)
bandpass filter

3.
Study leader:




Prof J Joubert

4.

Intended degree

programme

for this project
:


Electronic Engineering

5.
Research
g
roup:




Electromagnetism

6. Nature of the project:


Design

7.
Brief description of the project

In 2002, the Federal Communications Commission (FCC) in the USA allowed UWB
communication in the 3.1

10.6 GHz band having a

10 dB bandwidth greater
than 500
MHz and a prescribed maximum equivalent isotropic radiated power spectral density. In
such a system an UWB filter is one of the key components, which should exhibit wide
bandwidth with low insertion loss over the whole band. In order to meet the F
CC limit,
good selectivity at both lower and upper frequency ends and flat group
-
delay response
over the whole band is also required. For this project the student must design such a filter
with compact dimensions for integration as part of an UWB antenna.

8.
What will be expected of the student

8.1 Nature of deliverables



A literature survey on
ultra
-
wideband bandpass filters
.



A Matlab computer code to analyze the equivalent circuit representation of a
wideband filter.



A design for a
compact ultra
-
wideband
bandpass filter

with full
-
wave simulated
results.



Manufactured prototype of the
compact ultra
-
wideband bandpass filter

with measured
results.

8.2 New knowledge, skills and engineering tools to be mastered by the student



The student will have to study the l
iterature to familiarize himself/herself with the
design of compact ultra
-
wideband bandpass filter.




The student will need to learn to use CST Microwave Studio (a full
-
wave
electromagnetic analysis software package).



The student will need to master the the
ory required to design a
compact ultra
-
wideband bandpass filter
.

1. Project number



EM21

2.
Project title:


Design of a superdirective 3
-
element array for
adaptive beamforming

3.
Study leader:




Prof J Joubert

4.

Intended degree

programme

for this pro
ject
:


Electronic/Electrical Engineering

5.
Research
g
roup:




Electromagnetism

6. Nature of the project:


Design

7.
Brief description of the project

A small array composed of three monopole elements with very small element spacing is
considered for appli
cation in adaptive beamforming. The properties of this 3
-
port array
are governed by strong mutual coupling.
F
or signal
-
to noise maximization, it is not
sufficient to adjust the weights to compensate

for the effects of mutual coupling.
A
n RF
-
decoupling netw
ork (RF
-
DN)
may be used to cancel the effects of mutual coupling
.

The
array with closely spaced elements together with the RF
-
DN represent
s

a superdirective
antenna.

For this project the student has to design
such

a superdirective 3
-
element array
for adapt
ive beamforming
, using full
-
wave simulations and measurements.

8.
What will be expected of the student

8.1 Nature of deliverables



A literature survey on monople arrays and decoupling networks.



A Matlab computer code to analyze a basic array of 3 monopole
s.



A design for a
superdirective 3
-
element array for adaptive beamforming

with full
-
wave simulated results.



Manufactured prototype of the
superdirective 3
-
element array for adaptive
beamforming

with measured results.

8.2 New knowledge, skills and engineeri
ng tools to be mastered by the student



The student will have to study the literature to familiarize himself/herself with the
design of arrays for adaptive beamforming.





The student will need to learn to use CST Microwave Studio (a full
-
wave
electromagneti
c analysis software package).



The student will need to master the theory required to design a
superdirective 3
-
element array for adaptive beamforming
.



1. Project number



EM22

2.
Project title:


Design of a microstrip patch antenna with enhanced
perfo
rmance using combined electric
-

and
magnetic
-
conductor ground planes

3.
Study leader:




Prof J Joubert

4.

Intended degree

programme

for this project
:


Electronic Engineering

5.
Research
g
roup:




Electromagnetism

6. Nature of the project:


Investigative

7.
Brief description of the project

Microstrip patch antennas have been used extensively in wireless

communication because
of their light weight and ease of fabrication

and inte
gration with the electronics
.
However, they are narrowband

(<5%) and have low g
ains (
typically
6
dBi)
. Since the
invention

of high
-
impedance surfaces with forbidden frequency bands, or

the so
-
called
high
-
impedance
-
surface electromagnetic band
-
gap structures

(HIS
-
EBGs), researchers in
electromagnetics have reported

their characterizat
ion, design and applications in
microwave components

and antennas
. The application of these surfaces in planar

antennas in general, and microstrip patch antennas in particular, where

the perfect electric
conductor (PEC) ground plane is replaced by an

HIS,
has been promising. It has been
shown that these artificial ground

planes can improve the input impedance matching and
increase

the bandwidth.
For this project the student has to design such
a
microstrip patch
antenna with enhanced performance using combin
ed electric
-

and magnetic
-
conductor
ground planes
, using full
-
wave simulations and measurements.

8.
What will be expected of the student

8.1 Nature of deliverables



A literature survey on
microstrip patch antennas radiating above electric
-

and
magnetic
-
con
ducting ground planes
.



A design
of

a
microstrip patch antenna with enhanced performance using combined
electric
-

and magnetic
-
conductor ground planes

with
simulated results.



Manufactured prototype of the
microstrip patch antenna with enhanced performance
using combined electric
-

and magnetic
-
conductor ground planes

with measured
results.

8.2 New knowledge, skills and engineering tools to be mastered by the student



The student will have to study the literature to familiarize himself/herself with the
design
of
patch antennas
.





The student will need to learn to use CST Microwave Studio (a full
-
wave
electromagnetic analysis software package).



The student will need to master the theory required to design a
microstrip patch
antenna with enhanced performance usin
g combined electric
-

and magnetic
-
conductor ground planes.






1. Project number



EM23

2.
Project title:


Design of a

ring
-
slot microstrip a
ntenna

with a
wideband feed to obtain circular polarization for
satellite communication

3.
Study leader:




Pro
f J Joubert

4.

Intended degree

programme

for this project
:


Electronic Engineering

5.
Research
g
roup:




Electromagnetism

6. Nature of the project:


Investigative

7.
Brief description of the project

C
ircularly
polarized microstrip antennas are widely

empl
oyed in satellite
c
ommunications and navigation systems. Ring microstrip antennas have recently
attracted the

interest of research because of their attractive features such as

relatively low
profile, light weight, ease of fabrication, and compact

size
.

Var
ious techniques can be
found in literature that enhance

impedance matching and axial
-
ratio bandwidths.

8.
What will be expected of the student

8.1 Nature of deliverables



A literature survey on
circularly polarized antennas
.



A design
of

a
microstrip
ring
-
s
lot antenna with

a wideband feed to obtain circular
polarization

with simulated results.



Manufactured prototype of
a
microstrip ring
-
s
lot antenna

with measured results.

8.2 New knowledge, skills and engineering tools to be mastered by the student



The stude
nt will have to study the literature to familiarize himself/herself with the
design of
circularly polarized microstrip antennas
.





The student will need to learn to use CST Microwave Studio (a full
-
wave
electromagnetic analysis software package).



The stude
nt will need to master the theory required to design a
microstrip ring
-
slot
antenna with a wideband feed to obtain circular polarization
.


1. Project number



EM24

2.
Project title:


Miniaturization of patch antennas u
sing a

metamaterial
-
inspired t
echni
que

3.
Study leader:




Prof J Joubert

4.

Intended degree

programme

for this project
:


Electronic Engineering

5.
Research
g
roup:




Electromagnetism

6. Nature of the project:


Investigative

7.
Brief description of the project

Metamaterials is a
relatively

new term describing a concept of artificial, man
-
made
materials composed of small cells containing at least two different natural materials.
Metamaterials can exhibit much more pronounced electromagnetic properties than
natural materials or even completel
y new properties such as a negative index of refraction
or an electromagnetic band gap.

Microstrip patch antennas have been used extensively in wireless

communication because
of
advantages in terms of
light weight and ease of fabrication
.

Over the
recent p
ast

the
need for small, compact and low cost antennas has increased tremendously for
applications such as wireless communications and radar. Microstrip patch antennas,
though popular for these applications, are difficult to miniaturize, since their resonan
t
frequency is determined by the dominant

mode of the patch cavity
.
Various

miniaturization techniques
have been suggested, including the use of

shorting posts,
active loading or high permittivity dielectrics
.

It is also possible to use the
concept of
meta
materials to lower the resonance of
patch antennas
by

partially loading the patch
cavity with a properly designed homogeneous and isotropic mu negative metamaterial
.
This pro
ject will be an investigation into

the pos
sibilities of miniaturization of
rectang
ular
patch antennas using complementary split ring resonators
between the patch and the
ground plane.

8.
What will be expected of the student

8.1 Nature of deliverables



A literature survey on
the topic of
miniaturization of
microstrip patch antennas
using
metamaterials
.



A
report on the possibilities to miniaturize patch antennas using metamaterials, with
examples and a qualitative
investigation

of the
degradation

of efficiency

and
bandwidth as function of the level of miniaturization.



Manufactured prototyp
e of
a miniaturized patch antenna using metamaterials.

8.2 New knowledge, skills and engineering tools to be mastered by the student



The student will have to study the literature to familiarize himself/herself with the
design of patch antennas

and the desi
gn of metamaterials
.





The student will need to learn to use CST Microwave Studio (a full
-
wave
electromagnetic analysis software package).



The student will need to master the theory required to design a
reduced
-
size
microstrip patch
antenna using metamater
ials
.