Ultra Wide Band Antenna for High Speed Microwave Applications
1. UWB ANTENNA FOR
MICROWAVE
APPLICATIONS
Prepared by: Ahmed Tarek
Omar Hussien
Sherif Shawki
Sherif Zahran
Supervised by: DR/Mahmoud Abdallah
2. Agenda
What is Antenna.
What is UWB.
What is Micro-strip antenna.
Initial Design Results.
Single micro-strip antenna.
Circular & Rectangular UWB antenna.
3. Antenna
Antenna: Is an electrical device which
converts electric power into radio waves, and
vice versa.
Theory of operation.
4. Antenna Parameters
Radiation pattern :
Plot of the relative field strength of the radio waves
emitted by the antenna at different angles.
Antenna directivity:
The ratio of the radiation intensity in a given
direction from the antenna to the radiation intensity
averaged over all directions.
5. Antenna Gain:
Parameter which measures the degree of directivity
of the antenna's radiation pattern.
Antenna Polarization:
Is the orientation of the electric field of the radio
wave with respect to the Earth's surface and is
determined by the physical structure of the antenna and
by its orientation.
6. Input impedance:
Electro-magnetic wave travels through the
different parts of the antenna, at each interface
some fraction of the wave's energy will reflect back
to the source.
8. UWB
UWB: Ultra Wide Band, Also known as(ultra
band).
A series of very short baseband pulses with
time duration in nano-seconds that exist on
ALL frequencies simultaneously.
UWB in the frequency range from 3.1 to
10.6 GHz.
9. UWB transmissions transmit information by
generating small pulses at specific time
intervals.
Each pulse occupies a large BW, overcoming
The multipath fading but not the ISI.
10. UWB pulses are very short so most signal
reflections do not overlap the original pulse (less
than 1nsec).
(less than 60 cm for a 500 MHz pulse, less than 23 cm for a 1.3 GHz pulse), up to
1.3 Gp/sec providing a continuous stream of UWB pulses according to
application.
it operates parallel to other systems so energy
has to be low to get no interference.
11. UWB coexistence with systems
No interference with systems because of low
power.
Power limit for UWB Tx is -41.3 dBm/MHz.
High data rates according to Shannon's theory.
15. Why UWB?
High data rate and capacity(400-800Mbps ).
High speed.
High Security (cannot jam the large BW).
Low power (operates at low energy level).
Working parallel with other systems.
Fading overcoming.
18. Patch antenna
Radio antenna with a low
profile.
Narrowband.
Wide-beam antenna.
Simple to fabricate and
easy to modify and
customize.
Multiple feed points.
19. Advantages
Relatively inexpensive to manufacture and
design.
The ability to create high gain arrays in a low-
profile antenna.
The ability to have polarization diversity.
54. Future goals
Design and Implementation of UWB Antenna
which receives signals within range of 3.1-10.6
GHz.
With minimum interference with other bands
i.e.: Wifi, Bluetooth ,...etc