What is Antenna ?! What is microstrip Antenna ?! What is UWB ?! Difference between rectangular & circular Patch antenna !

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.

7. Antenna
 Mode: Patch antenna.
 Type: Monopole antenna.

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.

12. UWB vs. narrowband

13. UWB Applications
 AUTOMOTIVE INDUSTRY
-Back collision avoidance.
-Wireless key.
-Moving objects detection while driving.
-Improving airbags activation and suspension performance.
 COMMUNICATION
-High multipath areas.
-Low range-high rates areas.
-Home personal area networks.
(pcs,hd TV, hr printer, hr scanner,hd cameras, game consoles)

14. UWB Applications
 Security Apps
-Ground penetrating radars(GPR).
-Through wall surveillance.
-Tracking applications(specially indoors unlike GPS)
For children,personnel,equipments,cars
-Guarding objects (ex. in museums).

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.

16. Micro-strip antenna

17. Micro-strip antenna Types
 Patch
-Square.
-Rectangular.
-Circular.
-Elliptical.
 Planar Inverted F Antenna (PIFA).
 Folded Inverted Conformal Antenna (FICA).

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.

20. Matching
Matched Unmatched

21. Matched return loss

22. Unmatched return loss

23. Matching rules

24. UWB ANTENNA

25. Circular Antenna Rectangular Antenna

26. Circular return loss

27. Rectangular return loss

28. 3D PATTERNS
NORMALIZED SCALE
Fo=5 GHz

29. 1GHz
Circular Rectangular

30. 2GHz
Circular Rectangular

31. 3GHz
Circular Rectangular

32. 4GHz
Circular Rectangular

33. 5GHz
Circular Rectangular

34. 6GHz
Circular Rectangular

35. 7GHz
Circular Rectangular

36. 8GHz
Circular Rectangular

37. 9GHz
Circular Rectangular

38. 10GHz
Circular Rectangular

39. 11GHz
Circular Rectangular

40. 12GHz
Circular Rectangular

41. E-PLANE 2D
PATTERN
NORMALIZED SCALE
X-Y Plane
Theta=90

42. 1Ghz
Circular Rectangular

43. 2Ghz
Circular Rectangular

44. 3Ghz
Circular Rectangular

45. 4Ghz
Circular Rectangular

46. 5Ghz
Circular Rectangular

47. 6Ghz
Circular Rectangular

48. 7Ghz
Circular Rectangular

49. 8Ghz
Circular Rectangular

50. 9Ghz
Circular Rectangular

51. 10Ghz
Circular Rectangular

52. 11Ghz
Circular Rectangular

53. 12Ghz
Circular Rectangular

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

55. Any questions ?
Thank you