Hi, I'd need some help with the calculation and simulation of a rectangular microstrip antenna.
The question is rather simple. We have a dielectrica of given thickness and e_r. Now we shall combine it with another material with given e_r. The thickness shall vary. These two materials shall be stacked upon each other.
But how to calculate now a resulting e_r_total of both materials?
I know it is very basic and perhaps one should know it, but I can't remind how to solve this.
Regards, Christoph
Hi, I'm sorry. I don't quite understand the mentioned page. It doesn't really solve my problem.
I searching for a formular or a way how to calculate one epsilon_r from two different dielectrica with different epsilon_r, as I have seen it once with capacitors. But I can't remember how to calculate it. It should be almost the same with microstrip antennas as the are capacitors, no?
Perhaps I didn't describe my problem very precisely.
I stumbled across this recently. Thankfully, I didn't trip.
Regards, Bob Monsen
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Hi,
In the simple case of two stacked dielectrics (e_r1 & e_r2) of the same thickness, it would seem to me that the reciprocal of the resultant e_r might just equal the sum of the reciprocals of both e_r1 and e_r2. This follows from the simple formula for two capacitors in series where the presence or absence of the central plate doesn't change the capacitance.
Cheers - Joe
Hi,
Ten minutes later I found this -
which uses the alternative form of the expression for two capacitors in series. All you have to do now is to re-work the expression for dielectric slabs of differing thicknesses.
Best of luck - Joe
Thanks a lot. I think this is it. Just couldn't remember my physics class ;-)
Regards, Christoph
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