I have a WiFi application that we need to encapsulate for environmental reasons. We did some test shoots with Krayden PA2692 since the molder had experience with it. It's a polyamide material. The datasheet didn't give any RF parameters, but searching indicates the dielectric constant should be in the 2.5-2.8 range. RF performance once encapsulated was about 30% of free air. Does anyone have any suggestions for classes of material or what parameters matter most?
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\$\begingroup\$ Stray air capacitance effects on tuning or impedance matching are amplified by Dk, loss tangent, moisture absorption rate, adhesion, thermal conductance are most important. \$\endgroup\$– Tony Stewart EE75Commented Apr 2, 2019 at 18:22
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\$\begingroup\$ There are many grades of polyamide and polyolefin \$\endgroup\$– Tony Stewart EE75Commented Apr 2, 2019 at 18:23
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\$\begingroup\$ Also Parylene is used by some, \$\endgroup\$– Tony Stewart EE75Commented Apr 2, 2019 at 18:30
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