Hybrid type filter solution

A radio frequency (RF) duplexer, comprising:

• a common resonator being coupled to at least one chamber of an air cavity filter, the common resonator having a common resonator bottom wall, a plurality of common resonator side walls and a common resonator post, a first common resonator side wall of the plurality of common resonator side walls having a first window and a second common resonator side wall of the plurality of common resonator side walls having a second window;
• a first ceramic waveguide filter, CWGF, having a first opening in a first CWG wall of the first CWGF, the first opening being parallel to and at least partially aligned with the first window of the common resonator to couple energy between the common resonator and the first CWGF;
• and
• a second CWGF having a second opening in a second CWG wall of the second CWGF, the second opening being parallel to and at least partially aligned with the second window of the common resonator to couple energy between the common resonator and the second CWGF.

A dual band duplexer, comprising:

• a common resonator coupled on a first side of the common resonator to a chamber of a first air cavity filter and separately coupled on the first side to a chamber of a second air cavity filter;
• a first air cavity resonator having a first side coupled to a second side of the common resonator, the second side of the common resonator being opposite the first side of the common resonator;
• a second air cavity resonator having a first side coupled to the second side of the common resonator;
• a first ceramic waveguide filter, CWGF, coupled at an end wall to a second side of the first air cavity resonator, the second side of the first air cavity resonator being opposite the first side of the first air cavity resonator;
• and
• a second CWGF coupled at an end wall to a second side of the second air cavity resonator, the second side of the second air cavity resonator being opposite the first side of the second air cavity resonator.

An electromagnetic filter, comprising:

• an air cavity filter having:
• a bottom wall, parallel side walls, a first end wall at a first end of the air cavity filter, the first end wall having a first input/output port, and a second end wall at a second end of the air cavity filter opposite the first end of the air cavity filter;
• a first chamber at the first end of the air cavity filter, the first chamber being formed in part by the first end wall and the parallel side walls;
• and
• a second chamber at the second end of the air cavity filter, the second chamber having a resonator post, the second chamber being formed in part by a second end wall and the parallel side walls, a first side wall of the parallel side walls having a first window located in the second chamber;
• and
• a ceramic waveguide filter, CWGF, having parallel first and second broad walls, the first broad wall being adjacent to the first side wall of the parallel side walls, the first broad wall having an opening at least partially aligned with the first window located in the second chamber, the second broad wall having a second input/output port.