parabolic reflector

1. SQUARE MICROSTRIP PATCH ANTENNA
Umair CU-169-2016C BS.c Electrical Engineering, 7th
Semester
CECOS UNIVERSITY KHYBER PAKHTUNKHWA,
PESHAWAR, PHASE 6
HAYATABAD
Introduction
Construction and Working
⮚The microstrip
consists of a very thin
metallic strip or patch
placed on a ground
plane with a dielectric
material in-between.
⮚The radiating
element and feed lines
are placed by the
process of photo-
etching on the
dielectric material.
⮚The patch or
microstrip is chosen to
be square, circular or
rectangular in shape
for the ease of
analysis and
fabrication
Disadvantages
⮚It offers low
efficiency due to
dielectric losses
and conductor
losses.
⮚It offers lower
gain.
⮚It has higher level
of cross
polarization
radiation.
⮚It has lower power
handling capability.
⮚It has inherently
lower impedance
bandwidth.
⮚The microstrip
antenna structure
radiates from feeds
and other junction
points.
Advantages
⮚Smaller in size.
⮚They are easy to
fabricate and
comfortable on
curved parts of the
device.
⮚The microstrip
patches of various
shapes e.g.
rectangular,
square, triangular
etc. are easily
etched.
⮚They have lower
fabrication cost
and hence they can
be mass
manufactured.
⮚They are capable
of supporting
multiple frequency
bands (dual, triple).
⮚They support dual
polarization types
viz. linear and
circular both.
⮚They are light in
weight.
Application
⮚Used in Space craft
applications
⮚Used in Air craft
applications
⮚Used in Telemedicine.
⮚Used in Mobile and satellite
communication.
The Micrstrip patch antenna Model
versus Reality is shown the model
was designed in HFSS and then it is
printed.
Square Patch Antenna
Simulation
⮚The length of the
metal patch should be
λ/2.
⮚When the antenna is
excited, the waves
generated within the
di-electric undergo
reflections and the
energy is radiated
from the edges of the
metal patch which is
very low.
Parabolic Reflector Antenna
Name: Muhammad Usman
ID: Cu-10-2019
BSc. Electrical Engineering, 7th Semester
CECOS University of IT & Emerging Sciences, Hayatabad, Peshawar, Khyber pukhtunkhawa
Pakistan
i
Parabolic Antenna:
A type of reflector which has a reflecting
surface having the shape of a paraboloid that
is used to collect and radiated the electro-
magnetic energy is known as Parabolic
Reflector. It is regarded as the simplest and
popular form of reflector antenna.
When energy from the feed element when
strikes the polished surface then it is re-
radiated in a particular direction.
The parabolic reflector is sometimes referred
as a dish antenna and its distinctive shape
offers high gain and narrow bandwidth.
It is regarded as a reflective device that is
used both at transmitting as well as receiving
antenna.
(1).https://www.tutorialspoint.com/antenna_theory/
antenna_theory_parabolic_reflector.htm
(2). Shamshad, Fahad, and Muhammad Amin.
"Simulation comparison between HFSS, CST
and WIPL-D for design of dipole, horn and
parabolic reflector antenna." Advances in
Computational Mathematics and its
Applications (ACMA) 1.4 (2012): 203-207.
Antenna design and simulation is a
challenging discipline. We achieved excellent
results by developing a horn feed parabolic
mirror antenna founded on various efficiency
factors and simulating it on HFSS. Analysis of
outcomes helps us to draw conclusions. We
anticipate that the horn fed dish antenna will
be more efficient when utilized in an
application based on an examination of the
major parameters.
3Dplot
Consider having a parabolic reflector in
receiving mode and where the feed element is
present at the focus. The crucial function of the
parabolic reflector is to change the spherical
wave into a plane wave.
So, at the focus when a feed antenna is placed
which is nothing but an isotropic source then t
he waves are emitted from the source.
The radiating element used at the focus is
generally horn antenna which are used to
illuminate the reflecting surface.
Thus, the waves emitted from the source,
incident on the surface of the reflector and are
further reflected back as a plane wave of
circular cross-section.
Radiation pattern
Introduction
Applications Parabolic Reflector
antenna
Horn Feeding Element
Conclusion:
References:
The high directive gain offered by these
antennas makes it suitable for various
applications like:
• Satellite communication
• TV signal broadcasting
• Wireless communication
• Radio astronomy
• Parabolic microphones
Design of Parabolic Reflector
Antenna
Parameters Parabolic Reflector
Antenna
When looking at parabolic reflector antenna
systems there are a number of parameters
and terms that are of importance:
Focus: The focus or focal point of the
parabolic reflector is the point at which any
incoming signals are concentrated. When
radiating from this point the signals will be
reflected by the reflecting surface and travel in
a parallel beam and to provide the required
gain and beamwidth.
Vertex: This is the innermost point at the
centre of the parabolic reflector. Focal length
The focal length of a parabolic antenna is the
distance from its focus to its vertex. One
important element of the parabolic reflector
antenna theory is its focal length. To ensure
that the antenna operates correctly, it is
necessary to ensure that the radiating
element is placed at the focal point. To
determine this it is necessary to know the
focal length.
Frequency: the designing frequency of
parabolic reflector is 10 GHz.