Hi
I am trying to find technique to improve isolation between ports of a multiple feed slot ring antenna.
Generally there are dual feed which are orthogonal and the port isolation between them is well below -30 dB.
I tried to make annular slot ring antenna with slant polarization and also vertical or horizontal polarization. However the non orthogonal feeds have port isolation below -10dB.
O would really apprecitate if anyone can comment on suitable technique usuagea in this scenerio to put myself in right direction.
Thank you
The port isolation can be improved by placing parasitic strips among the feeding ports. The parasitic strips reduced the coupling among the ports.
Thank you Shahid Basir for your response.
I came across few works describing using of decouple line for port isolation.
Is that parasitic strips are similar to decouple lines ?
It would be very helpful if you can add any references.
Thanks
Dear Shabir Basir,
Pl. go through attached text document. Here we have shown three non orthogonal ring resonator excitation configuration where in high isolation typically 20 can be achieve, depending upon type of EBG structure selected. Hope it may help you.
Dear Shrivastav a.k.
Thank you for your response and explanation with the diagram.
It is a good technique to reduce port isolation.
However, can you comment on using this technique for multiple port isolation applied to same ring resonator? Will this same technique can work for dual feed, triple feed or quad feed ring antennas?
Dear Laxmikant Minz
The technique to reduce port isolation. which I have described in my first answer will work for multiple port isolation applied to same ring resonator and also work for dual feed, triple feed or quad feed ring antennas provided you have real-estate space available on your antenna PCB.
Thanks Shrivastav a.k. for your input. i tried this before but was not sure that it can work. as I was checking the e-field distribution over the radiating ring layer getting coupled to 2nd and third feed ...There was not much coupling through the ground layer. So I was doubtful in continue to use EBG technique. But will try more in improving port isolation using EBG technique after your suggestion.
Thanks
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