I have design a 20GHz Series feed antenna as a Tx and Rx.
Now i want 60 dB of isolation with 1*lembda spacing only kindly guide...........
You have to make them crosspolarized that is one with horizontal polarization and the other with vertical polarization. You can put a screening metal sheet between them. You can cancel the coupling between the two antennas be using signal cancelers.
We treated this point and published the the following two papers: Article Design of a Planar MIMO Antenna for LTE-Advanced
Article Mutual Coupling Reduction of MIMO Antennas using Parasitic E...
Best wishes
You have to make them crosspolarized that is one with horizontal polarization and the other with vertical polarization. You can put a screening metal sheet between them. You can cancel the coupling between the two antennas be using signal cancelers.
We treated this point and published the the following two papers: Article Design of a Planar MIMO Antenna for LTE-Advanced
Article Mutual Coupling Reduction of MIMO Antennas using Parasitic E...
Best wishes
60 dB isolation is very hard to get by cancellation (or by other means). If the initial coupling is 20 dB then you would need 40dB cancellation which requires about 1/2 degree phase stability between the breakthrough path and the cancellation signal, as well as the relative amplitudes staying within better than 0.01 dB. A combination of barrier, cross polarization and cancellation will probably be needed if it is to cope with temperature changes, for instance.
The arranged to cancel the coupled/leaked signal from the antenna and circulators, by creating 180◦ phase difference between the TX and RX reflected signals. Theoretically, with ideal devices this approach can provide infinite isolation. In practice, the isolation is limited by the electrical and geometrical imbalances.
I agree with prof Abdelhalim Zekry and also you can use EBG to make the isolation between the TX and RX.
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