Filter and antenna module

An antenna module comprising a filter and a polarization antenna, the filter comprising:

• at least one input port connected to an antenna, the at least one input port being configured to input a first polarization signal and a second polarization signal that are input from the antenna;
• at least one output port for outputting a first output signal corresponding to the first polarization signal and a second output signal corresponding to the second polarization signal, the first and the second output signals having been subjected to filter processing for making a desired frequency electric signal of each of the first and the second polarization signals pass through the first and the second output signals, respectively;
• and
• a resonator group comprising a plurality of resonators,
• wherein the resonator group excites a first excitation mode and a second excitation mode perpendicular to each other by the input first and second polarization signals, whereby the at least one output port outputs the first and the second output signals corresponding to the first and second polarization signals, respectively,
• wherein the resonator group comprises a first resonator connected to the at least one input port and a second resonator connected to the at least one output port, and
• wherein the first resonator comprises:
• a rectangular first slot opening;
• a rectangular second slot opening, a long side of the second slot opening being perpendicular to a long side of the first slot opening;
• a first feeder configured to propagate the first polarization signal, the first feeder being electromagnetically coupled to the first slot opening;
• and
• a second feeder configured to propagate the second polarization signal, the second feeder being electromagnetically coupled to the second slot opening.

A filter comprising:

• at least one input port connected to an antenna, the at least one input port being configured to input a first polarization signal and a second polarization signal that are input from the antenna;
• at least one output port for outputting a first output signal corresponding to the first polarization signal and a second output signal corresponding to the second polarization signal, the first and the second output signals having been subjected to filter processing for making a desired frequency electric signal of each of the first and the second polarization signals pass through the first and the second output signals, respectively;
• and
• a resonator group comprising a plurality of resonators,
• wherein the resonator group excites a first excitation mode and a second excitation mode perpendicular to each other by the input first and second polarization signals, whereby the at least one output port outputs the first and the second output signals corresponding to the first and second polarization signals, respectively, wherein
• the resonator group uses a via hole array formed on a laminated substrate as an electrical boundary wall.