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US 4,801,901 AGranted
Non-ferrite non-reciprocal phase shifter and circulator
AssigneeHittite Microwave Corporation
InventorYalcin Ayasli
Life of this patent
Estimating the term…
Abstract
A non-reciprocal phase shifter including a transmission medium connected between first and second terminals and having a predetermined phase shift which is the same in each direction and an amplifier circuit connected between the first and second terminals for introducing its inherent phase shift in one direction and a phase shift in excess of its inherent phase shift in the other direction for establishing a non-reciprocal phase shift; and a circulator made from such a phase shifter.
Claims14
A non-reciprocal bi-directional phase shifter comprising:
- a monolithic, non-ferrite circuit including:
- a transmission medium connected between first and second terminals and having a predetermined phase shift which is the same is each direction;
- and
- an amplifier circuit connected in parallel with the transmission medium between the first and second terminals, said amplifier circuit operating to introduce its inherent phase shift in one direction and a phase shift in excess of its inherent phase shift in the other direction for establishing a non-reciprocal phase shift between said first and second terminals.
1 more element
A three-port circulator comprising:
- three bi-directional phase shifters each including a transmission medium connected between first and second terminals and having a predetermined phase shift which is the same in each direction;
- and
- an amplifier circuit connected in parallel with the transmission medium between the first and second terminals for introducing its inherent phase shift in one direction and a phase shift in excess of its inherent phase shift in the other direction for establishing a non-reciprocal phase shift;
- said phase shifters being interconnected in a ring with the first terminal of each shifter being interconnected with the second terminal of another.
1 more element
A four-port circulator comprising:
- at least one non-reciprocal bi-directional phase shifter including a transmission medium connected between first and second terminals and having a predetermined phase shift which is the same in each direction;
- and an amplifier circuit connected in parallel with the transmission medium between the first and second terminals for introducing its inherent phase shift in one direction and a phase shift in excess of its inherent phase shift in the other direction for establishing a non-reciprocal phase shift;
- a second bi-directional phase shifter;
- and
- a passive four-port coupling network interconnecting said first and second phase shifters.
2 more elements
Dependencies are inferred from the claim text.