Planar microstrip filter disposed in a case and having movable structural components spaced at intervals relative to the filter

摘要

A filter of an embodiment includes: a microstrip-line planar filter that includes an input line, resonators, and an output line, and has a passband with a center frequency f0; a metal case housing the planar filter; and structural components that include dielectric components, the structural components arranged in the metal case at an interval in the traveling direction of electromagnetic waves from the input line to the output line or in a direction perpendicular to the wavefront of the standing waves generated by the electromagnetic waves resonating in the metal case, the interval being ⅕ to ½ wavelength in terms of the electrical length of the center frequency f0.

主权项

1. A filter comprising:
a microstrip-line planar filter including an input line, a plurality of resonators, and an output line, the microstrip-line planar filter having a passband with a center frequency f0; a metal case to house the planar filter; and a plurality of structural components including dielectric components, the plurality of structural components being arranged in the metal case at a first interval in a first direction, the first direction being a traveling direction of electromagnetic waves from the input line to the output line and a direction perpendicular to a wavefront of standing waves generated by electromagnetic waves resonating in the metal case, the first interval being ⅕ to ½ wavelength in terms of an electrical length of the center frequency f0.