Circuit isolation using a signal splitter/combiner

1. A system of providing filter isolation comprising:

a first filter configured to pass a first frequency range;

a second filter configured to pass a second frequency range; and

a signal splitter/combiner communicatively coupled to the first filter at a first port of the signal splitter/combiner and communicatively coupled to the second filter at a second port of the signal splitter/combiner, the signal splitter/combiner configured to:

receive a first signal filtered by the first filter at the first port of the signal splitter/combiner;

direct the first signal from the first port to a third port of the signal splitter/combiner and away from the second port such that the signal splitter/combiner directs the first signal away from the second filter, and

reduce a roll off requirement of one or more of the first filter and the second filter, the one or more of the first filter and the second filter having a roll off based on the reduced roll off requirement.

2. The system of claim 1 , wherein the signal splitter/combiner is further configured to:

receive a second signal filtered by the second filter at the second port of the signal splitter/combiner; and

direct the second signal from the second port to the third port and away from the first port such that the signal splitter/combiner directs the second signal away from the first filter.

3. The system of claim 1 , wherein the signal splitter/combiner is further configured to:

receive a second signal from the third port;

divide the second signal into a first signal portion and a second signal portion;

direct the first signal portion to the first port such that the first filter receives the first signal portion; and

direct the second signal portion to the second port such that the second filter receives the second signal portion.

4. The system of claim 3 , wherein the first filter is configured to filter out the first signal portion.

5. The system of claim 3 , wherein the second filter is configured to pass the second signal portion.

6. The system of claim 1 , wherein the first port of the signal splitter/combiner provides substantial impedance matching with the first filter and the second port of the signal splitter/combiner provides substantial impedance matching with the second filter.

7. The system of claim 1 , wherein the first frequency range and the second frequency range are separated by a guard band of less than 30 megahertz.

8. The system of claim 1 , wherein:

the first filter is included in a first-band circuit associated with a first communication band; and

the second filter is included in a second-band circuit associated with a second communication band.

9. The system of claim 1 , wherein:

the first filter is associated with an uplink band of a communication band; and

the second filter is associated with a downlink band of the communication band.

10. The system of claim 1 , wherein:

the first filter is included in a first duplexer; and

the second filter is included in a second duplexer.

11. A method of providing filter isolation comprising:

receiving a first signal filtered by a first filter at a first port of a signal splitter/combiner, the first port communicatively coupled to the first filter; and

directing, by the signal splitter/combiner, the first signal received at the first port away from a second port of the signal splitter/combiner and toward a third port of the signal splitter/combiner, the second port communicatively coupled to a second filter such that the signal splitter/combiner directs the first signal away from the second filter, the signal splitter/combiner being configured to reduce a roll off requirement of one or more of the first filter and the second filter, the one or more of the first filter and the second filter having a roll off based on the reduced roll off requirement.

12. The method of claim 11 further comprising:

receiving a second signal filtered by the second filter at the second port; and

directing, by the signal splitter/combiner, the second signal received at the second port away from the first port and toward the third port such that the signal splitter/combiner directs the second signal away from the first filter.

13. The method of claim 11 , further comprising:

receiving a second signal at the third port of the signal splitter/combiner;

dividing, by the signal splitter/combiner, the second signal into a first signal portion and a second signal portion;

directing, by the signal splitter/combiner, the first signal portion to the first port such that the first filter receives the first signal portion; and

directing, by the signal splitter/combiner, the second signal portion to the second port such that the second filter receives the second signal portion.

14. The method of claim 13 , further comprising filtering out the first signal portion by the first filter.

15. The method of claim 11 , wherein the first port of the signal splitter/combiner provides substantial impedance matching with the first filter and the second port of the signal splitter/combiner provides substantial impedance matching with the second filter.

16. The method of claim 11 , wherein:

the first filter is included in a first-band circuit associated with a first communication band; and

the second filter is included in a second-band circuit associated with a second communication band.

17. The method of claim 11 , wherein:

the first filter is associated with an uplink path of a signal booster; and

the second filter is associated with a downlink path of the signal booster.

18. The method of claim 11 , wherein:

the first filter is included in a first duplexer; and

the second filter is included in a second duplexer.

19. A system of providing filter isolation comprising:

a first filter configured to pass a first frequency range, the first filter being included in a first duplexer;

a second filter configured to pass a second frequency range, the second filter being included in a second duplexer; and

a signal splitter/combiner communicatively coupled to the first filter at a first port of the signal splitter/combiner and communicatively coupled to the second filter at a second port of the signal splitter/combiner, the signal splitter/combiner being configured to:

receive a first signal filtered by the first filter at the first port of the signal splitter/combiner; and

direct the first signal from the first port to a third port of the signal splitter/combiner and away from the second port such that the signal splitter/combiner directs the first signal away from the second filter.

20. A system of providing filter isolation comprising:

a first filter configured to pass a first frequency range;

a second filter configured to pass a second frequency range; and

a signal splitter/combiner communicatively coupled to the first filter at a first port of the signal splitter/combiner and communicatively coupled to the second filter at a second port of the signal splitter/combiner, the first port providing substantial impedance matching with the first filter and the second port providing substantially impedance matching with the second filter, the signal splitter/combiner being configured to:

receive a first signal filtered by the first filter at the first port of the signal splitter/combiner; and

direct the first signal from the first port to a third port of the signal splitter/combiner and away from the second port such that the signal splitter/combiner directs the first signal away from the second filter.