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Hi, I contruct stripline 30 dB Backward Directional coupler with substrate Air - PCB(Er=2.3) - Air.
I have problem with very small or zero directivity.
Coupled port 13
Directivity 32 is very bad
1 ------------------------------------------- 2...
Very good books about DC is
RF & MW Coupled-Line Circuits (1999) by Bahl.
I recomanded frist simulate Odd and Even Mode impedance for individual sections, and after this model full DC.
Good luck
hfss boundaries
Hi, you must draw, radiation boundary around radiate face(s), antena. Min length is lamda/4 around this face(s).
My experience is, lamda/3 is better for better results.
Good Luck
Re: [Help-40pts] Microstrip Filters
Hi, in Designer is possible deffine your concrete substrate and sumulate your concrete fiter on this material.
This procedure is explaned in manual.
Hi E.
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