[AMPS] Properties of plastics at 10 GHz

[Dave Kirkby]

> So Delrin has virtually no loss at 10GHz, however, it melts readily in 
> roller coils at HF?
> 
> 
> Rich...
> 
> R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  
> 

Absorption peaks can be very narrow. That's why I asked for data at 10GHz, and 
did not do as some suggested and stick some plastic in the microwave oven 
(2.4 GHz). The reason all microwave ovens use 2.4 GHz is that there is a water 
absorption peak at 2.4 GHz. Hence you can not make assumptions about the loss 
at one frequency from the loss at another.

Ceramic insulators are often used at RF, where their loss is low. However,
they are pretty lossy in the visable (that's why you can's see through them). 
Same goes for PTFE -its not exactly transparent, but a good RF diectric. RF a
and light are still the same electromagnetic spectrum.

G8WRB

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