Development of Aperture Coupled Closed form Formulae _LOwer Mode.ppt

Microstrip

1. Development of Compact Design
Formulae For Aperture Coupled MPA for
Satellite Communication Applications
By: Amit Ghosh, Samik Chakraborty, SwarnadiptoGhosh, Dipankar Saha, Sunday
CookeyEkpo, Stephen Alabi

2. Overview
•Introduction and analysis to Aperture coupled MPA
•Closed form equations are presented for designing aperture coupled microstrip antennas to
ensure impedance matching with the feed network with a low return loss over a wide
frequency band.
•The features like compactness, integrability with printed circuits, shielding of the radiating
patch from the radiation emanating from the feed structure
•Satellite communication in fields like high-speed video streaming, mobile computing, and
communications.
•Planar antennas array: 32 X 32 elements

3. An Aperture coupled MPA
MPA
Patch
Substrate
Ground
Feed
Substrate

4. MPA
Patch
Substrate
Ground
Feed
Substrate

5. MPA
Patch
Substrate
Ground
Feed
Substrate
Aperture

6. MPA
Ground
Feed Line
Aperture

7. MPA
Ground
Feed Line
Aperture

8. MPA
Ground
Feed Line
Aperture

9. M: Equivalent Magnetic Current in Aperture
H field of the patch

10. M.H dvcoupling

14. Y
o,βcharacterizetherectangular
patchantennaasamicrostripline
ofwidthb
(G
r+jB
open) is the edge
admittance of the patch.
??????1 = ??????0

15. Equivalent Circuit Model
(w,Є
rem,β
m,Z
om)aremicrostriplineparameters
(l
w, Є
res,β
s,Y
os) are the correspondingslotlineparameters

16. Development of Closed Form Design Formulae

17. Development of Closed Form Design Formulae

18. •Thus we get:

19. For average error=0.69%, max error = −2.6%

20. UsingcorrelationtechniquesandtruncationofBesselFunctionupto7
th
ordertermweobtaintheInput
Impedanceatthefeedlineconsideringthepresenceofpatchandslotcanbeexpressedinclosed
form:

21. MPA
APERTURE
FEED

22. Single MPA
Return loss vs. frequency plot for single
aperture coupled patch (simulated)
Radiationpatternforsingleaperturecoupled
patch(simulated)
antenna substrate, thickness=1.5875 mm, Єr=2.4
for feedline substrate, thickness=0.79375 mm, Єr=2.4.
resonant length= 3.70mm and patch width =5.60 mm
1.85 GHz
79.2 deg

23. 4x4 array of aperture coupled
MPA

24. 4x4 array of aperture coupled
MPA

25. 4x4 array of aperture coupled
MPA

26. 4x4 array of aperture coupled
MPA

27. 4x4 array of aperture coupled
MPA

28. 4x4 array
Results

29. 4x4 array
Results
Returnlossvs.frequencyplotfor
aperture-coupledmicrostriparray
(experimental)
Radiation pattern for aperture-coupled
microstrip array (experimental)
Next, moving to32x32 Aperture coupled MPA

30. 32x32 Aperture coupled MPA

31. 32x32 Aperture coupled MPA

32. 32x32 Aperture coupled MPA

33. 32x32 Aperture coupled MPA Results
Elevation plane radiation pattern of 32X32 aperture coupled
microstrip patch antenna array

34. Thank You