I wish to try out the Farnell/Element14 Multicomp Peltier thermoelectric modules or similar, in cascade for cooling an LNA block of a sensitive microwave band receiver. 1. In general, What is the material used for the shells of these modules, eg MULTICOMP - MCPE-127-10-13 - PELTIER COOLER, 38.1W? eg. http://au.element14.com/multicomp/mcpe-127-10-13/peltier-cooler-38-1w/dp/1639751 2. Does anyone have dielectric constant values for this and similar products across a range of frequencies, ie {10, 100, 500} MHz, {1, 2, 5, 10} GHz 3. What adhesive should I use to bond these modules together? Kind regards, Julian Grodzicky
The surface is made of Al2O3 ceramics, usually. The dielectric constant should be about 8...10, depending on chemical purity. Use a bonding material that is recommended for Al2O3 ceramics. And keep water condensation in mind...
Thank you for your reply, Kai. \epsilon = 8...10, that's about a 25% variation, at best. I might see what else is in the name brand Peltier module market, rather than the Multicomp brand, even though it seems inexpensive. This is element 14's/Farnell's generic brand, and could be sourced from anywhere. The Product page say these current units come from Russia, so I'm not sure how product specification variation plays across production runs, or what the quality of the shell ceramic will be.