Efficient dual-polarization multi-input and multi-output system

1. An electronic device having an isolation circuitry comprising:

a input configured to receive a dual-polarized signal over a radio-frequency cable;

a filter configured to filter the dual-polarized signal to obtain a first polarized signal having a first frequency;

a delay configured to delay the first polarized signal to be out of phase with a component of the dual-polarized signal corresponding to the first polarized signal;

summing circuitry configured to add the delayed first polarized signal to the dual-polarized signal to cancel the corresponding component of the dual-polarized signal corresponding to the first polarized signal to generate a second polarized signal having a second frequency;

a first output configured to output the first polarized signal to a first path; and

a second output configured to output the second polarized signal to a second path.

2. The electronic device of claim 1 , wherein the filter comprises a physical bandpass filter configured to block all frequencies outside of a pass frequency range that includes the first frequency.

3. The electronic device of claim 1 , wherein the filter comprises an N-path bandpass filter configured to block all frequencies outside of a pass frequency range that includes the first frequency.

4. The electronic device of claim 1 , wherein the filter comprises a physical notch filter that is configured to block a block frequency range that includes the second frequency.

5. The electronic device of claim 1 , wherein the filter comprises an N-path notch filter that is configured to block a block frequency range that includes the second frequency.

6. The electronic device of claim 1 , comprising an amplifier configured to amplify the delayed first polarized signal before the summing circuitry adds the delayed first polarized signal to the dual-polarized signal.

7. The electronic device of claim 1 , wherein the summing circuitry comprises a summing amplifier.

8. The electronic device of claim 1 , comprising first processing circuitry configured to:

receive the first polarized signal from the first output; and

perform a first process on the first polarized signal.

9. The electronic device of claim 8 , wherein the first processing circuitry comprises a processor or an antenna.

10. The electronic device of claim 8 , comprising second processing circuitry configured to:

receive the second polarized signal from the second output; and

perform a second process on the second polarized signal.

11. The electronic device of claim 10 , wherein the second processing circuitry comprises a processor or an antenna.

12. Isolation circuitry, comprising:

an input configured to receive a dual-polarized signal having a first polarized component having a first frequency and a second polarized component have a second frequency;

an N-path filter having a frequency response configured to remove the second polarized component from the dual-polarized signal to derive a first signal having the first polarized component;

a delay configured to delay the first signal to be out of phase with the first polarized component of the dual-polarized signal;

summing circuitry configured to add the delayed first signal to the dual-polarized signal to cancel out the first polarized component of the dual-polarized signal to generate a second signal having the second polarized component;

a first output configured to output the first signal; and

a second output configured to output the second signal.

13. The isolation circuitry of claim 12 , wherein the N-path filter comprises an N-path bandpass filter configured to pass a first frequency range including the first polarized component while blocking all other frequencies.

14. The isolation circuitry of claim 12 , comprising an amplifier configured to amplify the delayed first signal before the summing circuitry adds the delayed first signal to the dual-polarized signal, wherein an amount of amplification to compensate for attenuation of the first polarized component due to the N-path filter or the delay.

15. A method, comprising:

receiving, at an input to isolation circuitry, a dual-polarized signal;

filtering the dual-polarized signal using a filter to obtain a first polarized signal having a first frequency;

delaying the first polarized signal to be out of phase with a component of the dual-polarized signal corresponding to the first polarized signal;

adding the delayed first polarized signal to a copy of the dual-polarized signal to cancel the corresponding component of the dual-polarized signal corresponding to the first polarized signal to derive a second polarized signal having a second frequency;

outputting the first polarized signal to a first path after filtering the dual-polarized signal; and

outputting the derived second polarized signal to a second path.

16. The method of claim 15 , comprising amplifying, using an amplifier, the delayed first polarized signal to have an amplitude equal to an amplitude of the corresponding component.

17. The method of claim 16 , wherein a length of delay is based at least in part on a period of delay introduced by the amplifier.

18. The method of claim 16 , wherein an amount of amplification of the amplifier is set to compensate for attenuation in the filter during filtration.

19. The method of claim 15 , wherein filtering the dual-polarized signal comprises filtering the dual-polarized signal with a physical bandpass filter or an N-path bandpass filter, wherein the filter is configured to pass a pass frequency range that includes the first polarized signal and block all other frequencies.

20. The method of claim 15 , wherein filtering the dual-polarized signal comprises filtering the dual-polarized signal with a physical notch filter or an N-path notch filter, wherein the filter is configured to block a block frequency range that includes the second polarized signal and pass all other frequencies including the first polarized signal.