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 5mm x 5mm
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 or controversial designs
Keep it simple but original

9. Needs contrasting color for dimensions
Cingular Logo design
Needs contrasting color for dimensions

10. Football Design Do not use white on black background– Needs contrasting color for dimensions

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

12. Batman
Top Section (enlarged)
Full Dimension Drawing

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

14. “Hi” design

15. UNC-Charlotte Crown design

16. 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

17. Eagle head

18. Clover Design

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

20. Dilbert 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
Arrayed design printed on special transparency paper
Number of good antenna per wafer = 13

24. Approximately 70 complete antenna per wafer
Satellite Dish
Approximately 70 complete antenna per wafer

25. 105 complete antenna per wafer
Simple Spiral
Approximately
105 complete antenna per wafer

26. Assignment – due next class
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 be 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
AutoCAD available on MOSAIC under Mechanical Engineering – Autodesk
AutoCAD tutorial on the Engr 1202 ECE web site
TA available to help