3. Antenna Design - Review
In antenna design, an important design parameter is the wavelength of the EM wave
Wavelength is a function of frequency
Antenna length is typically either
1 wavelength
¼ wavelength
½ wavelength

4. Frequency vs wavelength

5. Wavelength Calculations
Wavelength units:
l (wavelength) m/cycle
f (frequency) cycles/sec = hertz
c (speed of light) m/sec = 3.0 x 108 m/sec
Wavelength equation
l = c / f
m/cycle = (m/sec) / (cycles/sec)

6. Sample calculation Find the wavelength of a frequency of 850 MHz
Convert 850 MHz to Hz
850 MHz = 850 x Hz = 8.50 x 108 Hz
Use wavelength equation
l= c/f where c = speed of light = 3.0 x 108 m/sec
l = (3.0 x 108 m/sec ) / (8.50 x 108 cycles/sec)
l = .353 m/cycle
Convert to cm gives
l = 35.3 cm/cycle
For a ¼ wavelength antenna = (35.3cm/cycle)/4=8.825cm/cycle

8. Design Criteria Maximum size 20mm x 20mm Minimum size 10mm x 10mm
Can be rectangular – does not have to be square
Lines need to be about 0.5 mm thick
No sharp corners
Length must equal wavelength of chosen application
Must have a picture frame around the design to allow for cutting into individual antenna
No offensive, controversial, sexual, gang sign, etc. designs
Keep it simple but original

9. Some of these designs did not follow the design criteria
Some previous designs
Some of these designs did not follow the design criteria

10. “Hi” design

11. Aladdin’s Lamp Dimensions not in contrasting color
Lots of wasted space

12. XBOX design Note-DO NOT USE WHITE ON BLACBACKGROUND

13. Batman
Top Section (enlarged)
Full Dimension Drawing

14. UNC-Charlotte Crown design

15. Overall frame size 10.0mm x 8.00 mm
UNCC 49er Pick
Overall frame size 10.0mm x 8.00 mm
Lots of wasted space

16. Eagle head

17. Clover Design

18. Tree Design

19. UNCC
Design does not have to be square – can be rectangular provided no side is larger than 20mm

20. Dilbert Dimension Drawing Way too complex but cool
Final design is mm long

21. The Dilbert Antenna Design

22. The goal of the dimension drawing is to create a “mask”
Your mask will be used to create your design on your wafer
It will be printed full size and repeated in rows and columns to fill 100mm wafer
Your mask will be created on a special transparency sheet
Your design will be black to block light with a clear background to allow light to pass
It is a low cost alternative to expensive glass masks which can cost $500 or more each

23. Antenna Design to Mask Formation – Head Design
Arrayed design printed on special transparency paper
Number of good antenna per wafer = 13

24. Antenna Design to Mask Formation – Tree Design
Arrayed design printed on special transparency paper
Number of good antenna per wafer = 49

25. Antenna Design to Mask Formation – Triangle Design
Arrayed design printed on special transparency paper
Number of good antenna per wafer = 21

26. Satellite Dish Antenna Mask
Approximately 70 complete antenna per wafer

27. Air Force Logo Antenna mask
16 complete antenna per wafer

28. Death Star Antenna Mask
Approximately 42 complete antenna per wafer

29. Antenna Symbol Antenna Mask
Approximately 42 complete antenna per wafer

30. Approximately 36 complete antenna per wafer
UNCC Antenna Mask
Approximately 36 complete antenna per wafer

31. Approximately 84 complete antenna per wafer
Dodge Charger Mask
Approximately 84 complete antenna per wafer

32. UNCC Crown Antenna Mask
Approximately 20 complete antenna per wafer

33. Simple Spiral Antenna Design
Approximately
105 complete antenna per wafer

34. Mask Tradeoffs For antennas, size counts, larger is a better antenna
For lower cost, smaller is better – more antenna per wafer gets unit cost lower
For higher quality – use a full length wavelength design
For lower cost – use a ¼ wavelength design

35. Assignment One per team required – additional designs are allowed
Dimension drawing for your team’s antenna design
Overall length must match your antenna design length
All corners to be rounded
Must Not print on “Black” background
Dimensions must be in a contrasting color
Keep it simple
Preview design before submission
Must have a dimensioned frame (box) around the design. This is necessary as a cutting guide for slicing the wafer into individual antenna. Length and width of frame must be specified.
AutoCAD available on MOSAIC under Mechanical Engineering – Autodesk
AutoCAD tutorial on the Engr 1202 ECE web site
TA will work with each team to create their design