Patent ID: 6559740
Filing Date: 2003-05-06
Classification: H01P

Abstract:
A tunable, cross-coupled, bandpass filter comprising:a housing having a plurality of sequential resonator cavities which start with a beginning cavity and end with an ending cavity, an input port connected to said housing which is to transmit an electromagnetic signal into said beginning cavity, an outlet port connected to said housing which is to receive from said ending cavity a filtered electromagnetic signal which has matured from said electromagnetic signal; a resonator mounted within each of said resonator cavities; each of said resonator cavities having an in-line coupler for coupling said electromagnetic signal between a said resonator of one said cavity and a resonator of a subsequent directly adjacent said cavity; a cross-coupler disposed between a first said cavity and a second said cavity of said cavities, said first cavity being non-sequential to said second cavity, said cross-coupler providing cross-coupling of an electromagnetic field of said electromagnetic signal between said first cavity and said second cavity, said cross-coupler including a printed circuit board; said printed circuit board including a compression board, said compression board being constructed of a dielectric material; said printed circuit board comprising a dielectric layer and an electrically conductive layer, a significant portion of said electrically conductive layer being located between said compression board and said dielectric layer.