Improving microstrip directional coupler directivity for VHF 80-120 MHz range

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#1 21677167 24 Mar 2017 20:44

Puneet Chandhok Puneet Chandhok

Anonymous

Post #1
21677167 24 Mar 2017 20:44

Dear All,

I am working on a microstrip directional coupler for VHF Range from 80-120 MHz,

how can I improve the directivity of the forward and reflected ports?
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#2 21677168 25 Mar 2017 22:37

Kevin Angelo Ma Kevin Angelo Ma

Anonymous

Post #2
21677168 25 Mar 2017 22:37

Have you tried VSWR? I've read somewhere that in general the directivity depends upon the different velocity of the odd and even mode in the structure. So equalizing these 2 velocities the directivity should improve.
Techniques to do this are:
1) Add lumped capacitors at the end of the lines
2)Dielectric overlays
3)Wiggy lines
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