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Piezoelectric Foam
Kirt's Cogitations™ #3

These original Kirt's Cogitations™ may be reproduced (no more than 5, please) provided proper credit is given to me, Kirt Blattenberger.

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   Cog·i·ta·tion [koj-i-tey'-shun] – noun: Concerted thought or
                                        reflection; meditation; contemplation.
   Kirt [kert] – proper noun: RF Cafe webmaster.


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Piezoelectric Foam

Piezoelectric foam? Researchers have discovered that polypropylene foam (used widely in packaging) acquires piezoelectric properties after it is zapped with several thousand volts. Air in the pores break down into electrons and positively charged ions that cling to opposite walls of the cavities. It is already being used in keypads and musical instrument pickups. Future applications include conformable ultrasound arrays for medical instrumentation and even embedded ultrasonic "bar code" type configurations built into products for security and identification. The only drawback that needs to be overcome is the material loses its piezoelectric properties above 55° C.
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RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

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