So the two patch antennas are designed to resonate at the frequency 5.8GHz. now to enhance the mutuel coupling bewteen them, they put a structure of 3 SRR that act kinda like a filter for certain frequencies therefore better isolation will be obtained. now for the reconfiguration part, is kinda confusing for me, they add 6 pin diodes to enhance gain, how is that? if anyone could explain me the theory behind it or even link some refference that could help me understand this design, i'd be greateful.
link to article : Article CSRR INTEGRATED RECONFIGURABLE MIMO ANTENNA FOR ISOLATION ENCHANCEMENT
I am having trouble making sense of it. I don't know how the PIN diodes are biased on or off when the ends are shorted together by the rings. However, that works fine in a simulation where problems like that don't have to be solved if you don't want to. Are these microstrip antennas on a 1.7 mm substrate over ground? I'm not sure. If so, I didn't expect much coupling between the V antennas anyway, as the radiation is mainly from the top and bottom edges, with nulls left and right.
Maybe the antennas are monopoles without a ground behind the patches? Then the V antennas would couple.
I am confused about the polar diagrams. I think they are in the two vertical planes. They don't look omnidirectional to me, and I can't find the power scale.
Dear Oussama Zeggai , as I understand by different activation of pin-diodes can be changed the level of mutual coupling between two patch antennas. In the general case, two connected patch antennas will have more gain than only the one patch antenna. With help of CSRR with different shorting, you can change mutual coupling and can change the common effective surface of two antennas elements
Yes they re micro strip anteena on 1.7mm fr5 substrate. They refer to a "on" diode with state "1" and "0" if its off.
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