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# <a name="Just In Time CPA Design: Septemb"></a> Just In Time CPA Design: September 11, 2003

"Version 2" Cylindrical Patch Antenna design.

Construction, from the inside out:

1. 5.25" OD 1/8" thick Al airframe module (the avionics module)
2. 0.005" soft copper (ground plane)
3. 1/16" double-sticky foam PE tape (dielectric)
4. 0.005" double-sided PCB (corporate feed network and radiator)

More information:

- Here's information on calculating the [[Er of polyethylene foam tape|PeFoamTapeEr]].
- Attached below is an Excel spreadsheet that calculates the CPA dimension, AND generates EAGLE commands to lay up the antennas: cpa\_calculator\_6.xls.
- Attache below is the EAGLE CAD and Gerber files of the 3 different antennas: cylindrical\_patch\_antennas.zip.