Filter isolation using a circulator

A method of providing filter isolation comprising:

• receiving a first signal at a first port of a circulator, the first port communicatively coupled to a first filter;
• directing, by the circulator, the first signal received at the first port away from a second port of the circulator and toward a third port of the circulator, the second port communicatively coupled to a second filter such that the circulator directs the first signal away from the second filter;
• receiving a second signal at the third port of the circulator;
• and
• directing, by the circulator, the second signal received at the third port to the second port and away from the first port such that the circulator directs the second signal toward the second filter and away from the first filter, the circulator 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.

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 circulator communicatively coupled to the first filter at a first port of the circulator and communicatively coupled to the second filter at a second port of the circulator, the circulator configured to:
• receive a first signal at a third port of the circulator and direct the first signal from the third port to the first port and away from the second port such that the circulator directs the first signal toward the first filter and away from the second filter;
• receive a second signal filtered by the second filter at the second port of the circulator and direct the second signal from the second port to the third port and away from the first port such that the circulator directs the second signal away from the first filter;
• and
• provide at least 10 decibels of isolation between the first filter and the second filter.

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 circulator communicatively coupled to the first filter at a first port of the circulator and communicatively coupled to the second filter at a second port of the circulator, the first port being substantially impedance matched with the first filter and the second port being substantially impedance matched with the second filter, the circulator configured to:
• receive a first signal at a third port of the circulator and direct the first signal from the third port to the first port and away from the second port such that the circulator directs the first signal toward the first filter and away from the second filter;
• and
• receive a second signal filtered by the second filter at the second port of the circulator and direct the second signal from the second port to the third port and away from the first port such that the circulator directs the second signal away from the first filter.