Patent ID: 6522217
Filing Date: 2003-02-18
Classification: H01P

Abstract:
A tunable HTS filter comprising:(a) an enclosure having a first inner surface, a second inner surface spaced apart from and opposite to said first inner surface, and at least one other inner surface connecting said first and second inner surfaces to form said enclosure, wherein at least said inner surfaces of said enclosure are constructed of a conductive material, and wherein said enclosure is fitted with an input connector and an output connector; (b) an HTS filter circuit within said enclosure, said HTS filter circuit comprising a substrate having a front surface spaced apart from and opposite to said second inner surface, a back surface in grounding contact with said first inner surface, an HTS filter element on said front surface, said HTS filter element comprising one or more HTS resonators, an input transmission line coupling said HTS filter element to said input connector, and an output transmission line coupling said HTS filter element to said output connector; (c) a plate within said enclosure, said plate having a front surface spaced a distance apart from and opposite to said HTS filter circuit, and a back surface opposite to said second inner surface, wherein said front surface is covered with an HTS film on at least the portion of said front surface opposite said one or more resonators of said HTS filter element; (d) an actuator connected to said plate and to one or more of said first inner surface, said second inner surface and said HTS filter circuit, said actuator defining said distance at which said front surface of said plate is spaced apart from said front surface of said HTS filter element, provided that said actuator connection is non-conductive between said plate and said HTS filter circuit; and (e) a tuning controller connected to said actuator to adjust said distance between said front surface of said plate and said HTS filter element of said HTS filter circuit.