This document summarizes the design of a square patch microstrip antenna for circular polarization using IE3D software. It describes the steps taken to design the antenna such as defining substrate parameters, drawing the rectangular patch and adding probe feeds. Simulation results are presented for S-parameters, VSWR, Smith charts, current distribution and radiation patterns. Comparisons are made by changing the dielectric constant and patch dimensions to study their effects on bandwidth and beamwidth. The presentation aims to share the antenna design process and analyze the impact of varying design parameters on the antenna's radiation performance.

1. Presentation Antenna Engineering In Topic Design Of Square Patch Microstrip Antenna for Circular Polarization Using IE3D Software

2. By Mr. Anon Mosuwan 51-3506-016-7 & Mr. PratanSrikamonpattanawut51-3506-030-8 ENET R-41

3. Abstract Communication between humans was first by sound through voice. With the desire for slightly more distance communication came, devices such as drums, then, visual methods such as signal flags and smoke signals were used. These optical communication devices, of course, utilized the light portion of the electromagnetic spectrum. It has been only very recent in human history that the electromagnetic spectrum, outside the visible region, has been employed for communication, through the use of radio. One of humankind’s greatest natural resources is the electromagnetic spectrum and the antenna has been instrumental in harnessing this resource.

4. Aim and Objective Microstrip patch antenna used to send onboard parameters of article to the ground while under operating conditions. The aim of the report is to design and fabricate a probe-fed Square Microstrip Patch Antenna and study the effect of antenna dimensions Length (L),and substrate parameters relative Dielectric constant (εr), substrate thickness (t) on the radiation parameters of Bandwidth and Beam-width.

5. Design of Square Patch Microstrip Antenna for Circular Polarization using IE3D Simulator Given specifications were, 1. Dielectric constant (εr) = 2.55 2. Frequency (fr) = 3.0 GHz. 3. Height (h) = 1/16 Inch = 1.59 mm. 4. Velocity of light (c) = 3×108 ms-1 . 5. Practical width (W) , W = 30 mm. 6. Loss Tangent (tan δ) = 0.001. 7. Practical Length (L) L = 30 mm.

6. 1. Start Zeland Program Manager.

7. 2. Click on M-Grid().

8. 3. Go to File>>>New and then press ()

9. 4. Define Substrate Parameters and then click “OK”

10. 5. Click “OK” again for go to M-Grid window

11. 6. Click on Entity >>> Rectangle .

12. 7. Define the parameter follow below figure

13. 8. After step 7. you will see this figure

14. 9. Press “shift+A “ for define X and Y coordinate of Probe feed

15. 10. After 9 step you’ll see this below figure

16. 11. Press “shift+A “ again for define second X and Y coordinate of Probe feed

17. 12. After 11 step you’ll see this below figure

18. 13. Go to Entity >>> Probe-Feed to Patch

19. 14. Define the parameter follow below figure

20. 15. You’ll see this below figure

21. 16. Go to Process >>> Simulate… and then define the parameter follow this below figure

22. 17. Enter Frequency Rang for simulate

23. 18. After 17 step the window will show this below figure and then click “OK” for start the simulation

24. 19. After the simulation S parameter dB[s(1,1)]

25. 20. After the simulation S parameter dB[s(2,2)]

26. 21. After the simulation VSWR Port 1

27. 22. After the simulation VSWR Port 2

28. 23. After the simulation Smith Chart S(1,1)

29. 24. After the simulation Smith Chart S(2,2)

30. 25. After the simulation Current Distribution

31. 26. After the simulation Elevation Pattern Gain Display

32. 27. After the simulation Total Field Gain vs. Frequency

33. 28. After the simulation Axial-Ratio vs. Frequency

34. Comparison when change Dielectric constant (εr) from 2.55 to be 10

35. 1. Comparison S(1,1) Parameter Before After

36. 2. Comparison S(2,2) Parameter Before After

37. Before After 3. Comparison VSWR port 1

38. Before After 4. Comparison VSWR port 2

39. Before After 5. Comparison Smith Chart S(1,1)

40. Before After 6. Comparison Smith Chart S(2,2)

41. Before After 7. Comparison 3D Distribution

42. Before After 8. Comparison Elevation Pattern Gain Display

43. Before After 9. Comparison Total Field Gain vs. Frequency

44. Before After 10. Comparison Axial-Ratio vs. Frequency

45. Comparison when change Practical width (W) from 30 mm to be 60 mm andPractical Length (L)from 30 mm to be 60 mm

46. 1. Comparison S(1,1) Parameter Before After

47. 2. Comparison S(2,2) Parameter Before After

48. Before After 3. Comparison VSWR port 1

49. Before After 4. Comparison VSWR port 2

50. Before After 5. Comparison Smith Chart S(1,1)

51. Before After 6. Comparison Smith Chart S(2,2)

52. Before After 7. Comparison 3D Distribution

53. Before After 8. Comparison Elevation Pattern Gain Display

54. Before After 9. Comparison Total Field Gain vs. Frequency

55. Before After 10. Comparison Axial-Ratio vs. Frequency

56. Question ?

57. Thank you for attention our presentation (^_^)