Patent ID: 8497748
Filing Date: 2013-07-30
Classification: H01P

Abstract:
1. A bandpass filter, comprising: a laminate comprising a plurality of dielectric layers; a ground electrode on or in the laminate; a first ½ wavelength resonant electrode in a first inter-layer portion of the laminate, having a strip shape; a second ½ wavelength resonant electrode in the first inter-layer portion of the laminate, in parallel with the first ½ wavelength resonant electrode, having a strip shape, and operable to output or input an unbalanced signal; a first ¼ wavelength resonant electrode between a first half portion including a first open end of the first ½ wavelength resonant electrode and a first half portion including a first open end of the second ½ wavelength resonant electrode in the first inter-layer portion, having a strip shape, comprising a ground end and an open end, in parallel to the first half portion of the first ½ wavelength resonant electrode and the first half portion of the second ½ wavelength resonant electrode, sandwiched by the first half portion of the first ½ wavelength resonant electrode and the first half portion of the second ½ wavelength resonant electrode, and operable to electronically couple with the first half portion of the first ½ wavelength resonant electrode and the first half portion of the second ½ wavelength resonant electrode; a second ¼ wavelength resonant electrode between a second half portion including a second open end of the first ½ wavelength resonant electrode and a second half portion including a second open end of the second ½ wavelength resonant electrode in the first inter-layer portion, having a strip shape, comprising a ground end and an open end, in parallel to the second half portion of the first ½ wavelength resonant electrode and the second half portion of the second ½ wavelength resonant electrode, sandwiched by the second half portion of the first ½ wavelength resonant electrode and the second half portion of the second ½ wavelength resonant electrode, and operable to electromagnetically couple with the second half portion of the first ½ wavelength resonant electrode and the second half portion of the second ½ wavelength resonant electrode; a first coupling electrode in a second inter-layer portion of the laminate, having a strip shape, facing the first half portion of the first ½ wavelength resonant electrode, comprising a first connection point which faces a half portion of the first half portion of the first ½ wavelength resonant electrode, operable to input or output one half of a differential signal, and operable to electromagnetically couple with the first half portion of the first ½ wavelength resonant electrode; a second coupling electrode in the second inter-layer portion, having a strip shape, facing the second half portion of the first ½ wavelength resonant electrode, comprising a second connection point which faces a half portion of the second half portion of the first ½ wavelength resonant electrode, operable to input or output the other half of the differential signal, and operable to electromagnetically couple with the second half portion of the first ½ wavelength resonant electrode; a third coupling electrode in the second inter-layer portion, having a strip shape, facing the first half portion of the second ½ wavelength resonant electrode, and operable to electromagnetically couple with the first half portion of the second ½ wavelength resonant electrode; a fourth coupling electrode in the second inter-layer portion, having a strip shape, facing the second half portion of the second ½ wavelength resonant electrode, and operable to electromagnetically couple with the second half portion of the second ½ wavelength resonant electrode.