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US 11,973,490 B2Granted
Non-reciprocal filter
AssigneeThe Trustees of Columbia University in the City of New York
InventorsJose Antonio Bahamonde, Ioannis Kymissis
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Abstract
A non-reciprocal filter with parametric amplification to obtain non-reciprocal propagation of forward and reverse signals is disclosed. The non-reciprocal filter may include two asymmetrical transmission lines and a current source. The filter, when implemented in the acoustics domain using surface acoustic waves (SAW), may operate in a phase-coherent or a phase-incoherent degenerate mode, providing low insertion loss and high decibels of isolation.
Claims16
A filter comprising:
- a first port and a second port, wherein an input signal propagates from the first port to the second port;
- a third port different from the first and second ports;
- a first transmission line connected to the first port and the third port;
- a second transmission line connected to the second port and the third port;
- and
- a current source connected to the third port, wherein the current source provides a modulation signal to the third port,
- wherein the length of the first transmission line is different from the length of the second transmission line, and
- the first and second transmission lines each comprises at least one capacitor and at least one inductor.
5 more elements
Dependencies are inferred from the claim text.