gh seminar ppt
Post on 28-Oct-2015
107 Views
Preview:
DESCRIPTION
TRANSCRIPT
PAPER PRESENTATION ON
“DESIGN OF FREQUENCY RECONFIGURABLE MICROSTRIP PATCH ANTENNA”
PRESENTED BY- RAJASTHAN TECHNICAL UNIVERSITY,KOTA
GHANSHYAM SINGH RAJASTHAN (INDIA)
1
PRESENTATION PLAN
2
1. Introduction1. Introduction
2. Need of reconfiguration technique2. Need of reconfiguration technique
3. Description of reconfigurable Antennas3. Description of reconfigurable Antennas
5. Simulation and results5. Simulation and results
6. Conclusion6. Conclusion
4. Basic design method 4. Basic design method
INTRODUCTION
About Antenna:-
Wireless communication systems have developed rapidly in
recent years. an antenna as a front component is required
to have a wide band, good radiation performances and
sometimes switchable ability.
Importance of Switchable ability:-
To obtain the switchable ability of the antenna, the concept
of a reconfigurable antenna was proposed . The reconfigurable
characteristics of antennas are very valuable for many
modern wireless communication and radar system applications3
4
The patch antennas can reconfigure by cutting rectangular or half-circular slots Different types of slots in the patch element are used and their dimensions have been varied in order to observe the relationship between maximum attainable linear phase range and the loss performance
Patch antenna:-
Microstrip Line Feed
Coaxial Feed
Aperture Coupled Feed
Proximity Coupled Feed
5
FEED TECHNIQUES OF PATCH ANTENNA
6
AntennaDesign
OptimizationSimulation
Reconfigurable antenna implementation
A frequency reconfigurable antenna
A reconfigurable radiation pattern
antenna
A reconfigurable polarization antenna
Combinations of the above stated
categories
7
CATEGORIES OF RECONFIGURABLE ANTENNAS
Group 1: Antennas using switches
Group 2: Antennas using capacitors or
varactors
Group 3: Antennas using physical
angular alteration
Group 4:Antennas using different biasing
networks
Group 5: Antenna arrays
Group 6: Antennas using reconfigurable
feeding networks
8
RECONFIGURABLE ANTENNAS CLASSIFICATION
Cognitive radio
Plug and play reconfigurable satellites
Multiple Input Multiple Output (MIMO)
communication systems
Cellular and personal communication
systems
Military applications
9
RECONFIGURABLE ANTENNAS APPLICATIONS
10
Basic design method
A new reconfiguration design technique is proposed by using slot configuration in the microstrip rectangular and circular patch antennas with two diodes connected inside the slot with on and off state working strategy. The frequency reconfiguration can be obtained by switching between the diodes.
The frequency can be varied in three different steps.
Both two diodes(D1 OFF , D2 OFF) are in off state
One diode D1 is in ON and another diode D2 is in OFF state
Both two diodes(D1 ON , D2 ON) are in ON state
11
L D1 D2
W
D1=OFF & D2= OFF
l
w
d
t
s
CASE-1 Diode D1 OFF & D2 OFF
12
13
14
L D1 D2
W
D1=ON & D2= OFF
l
w
d
t
s
CASE –II Diode D1-ON & D2- OFF
15
16
17
L D1 D2
W
D1=ON & D2= ON
l
w
d
t
s
CASE-III Doide D1- ON & D2-ON
18
19
Light weight and low volume.
Low profile planar configuration which can be
easily made
conformal to host surface.
Low fabrication cost, hence can be
manufactured in large
quantities.
Supports both, linear as well as circular
polarization.
Can be easily integrated with microwave
integrated circuits (MICs).
Capable of dual and triple frequency operations.
Mechanically robust when mounted on rigid
surfaces.
20
ADVANTAGES OF PATCH ANTENNA
Narrow bandwidth
Low efficiency
Low Gain
Extraneous radiation from feeds and junctions
Poor end fire radiator except tapered slot
antennas
Low power handling capacity.
Surface wave excitation
21
DISADVANTAGES OF PATCH ANTENNA
In this seminar the first aspect is the design of
recon- figurable antennas. These antennas are
reviewed, classified and grouped. They are
categorized into different groups based on their
reconfiguration techniques and they are classified
based on their reconfigurability properties.
Reconfigurable antenna designs, their
reconfiguration techniques and their applications
are reviewed. And a implementation is presented
and results are compared.22
CONCLUSIONS
THANKS
23
top related