Dielectric resonator formed by polygonal openings in a dielectric substrate, and a filter, duplexer, and communication apparatus using same

A slot mode filter comprising:

• a dielectric substrate,
• electrodes formed on both principal planes of said dielectric substrate,
• at least a pair of polygonal openings formed respectively in said electrodes,
• upper and lower conductors arranged while leaving gaps relative to said dielectric substrate,
• slot mode resonance areas formed between said openings, and input/output electrobes disposed for being electromagnetically coupled with said resonance areas.

A duplexer comprising:

• at least a first slot mode filter and a second slot mode filter,
• said first filter comprising a dielectric substrate, electrodes formed on both principal planes of said dielectric substrate, at least a pair of polygonal openings formed respectively in said electrodes, upper and lower conductors arranged while leaving gaps relative to said dielectric substrate, slot mode resonance areas formed between said openings, and input/output electrodes disposed for being electromagnetically coupled with said resonance areas,
• said second filter comprising a dielectric substrate, electrodes formed on both principal planes of said dielectric substrate, at least a pair of polygonal openings formed respectively in said electrodes, upper and lower conductors arranged while leaving gaps relative to said dielectric substrate, slot mode resonance areas formed between said openings, and input/output electrodes disposed for being, electromagnetically coupled with said resonance areas, and
• a common input/output electrode interconnecting one of the input/output electrodes of said first filter and one of the input/output electrodes of said second filter.

A communication apparatus comprising:

• at least a duplexer, a transmitting circuit, and a receiving circuit,
• said duplexer being made up of a slot mode transmitting filter comprising a dielectric substrate, electrodes formed on both principal planes of said dielectric substrate, at least a pair of polygonal openings formed respectively in said electrodes, upper and lower conductors arranged while leaving gaps relative to said dielectric substrate, slot mode resonance areas formed between said openings, and input/output electrodes disposed for being electromagnetically coupled with said resonance areas;
• a slot mode receiving filter comprising a dielectric substrate, electrodes formed on both principal planes of said dielectric substrate, at least a pair of polygonal openings formed respectively in said electrodes, upper and lower conductors arranged while leaving gaps relative to said dielectric substrate, slot mode resonance areas formed in portions of said dielectric substrate sandwiched between said openings, and input/output electrodes disposed for being electromagnetically coupled with said resonance areas;
• and a common input/output electrode interconnecting one of the input/output electrodes of said first filter and one of the input/output electrodes of said second filter,
• said transmitting circuit being connected to said transmitting filter, and said receiving circuit being connected to said receiving filter.

A dielectric resonator comprising:

• a dielectric substrate,
• electrodes formed on both principal planes of said dielectric substrate,
• a pair of polygonal openings formed respectively in said electrodes,
• upper and lower conductors arranged while leaving gaps relative to said dielectric substrate, and
• a resonance area formed between said openings;
• wherein said openings each have corners and one corner of each opening is different in shape from the other corners of that opening.

A duplexer comprising:

• at least a first filter and a second filter,
• said first filter comprising a dielectric substrate, electrodes formed on both principal planes of said dielectric substrate, at least a pair of polygonal openings formed respectively in said electrodes, upper and lower conductors arranged while leaving gaps relative to said dielectric substrate, resonance areas formed between said openings, and input/output electrodes disposed for being electromagnetically coupled with said resonance areas,
• said second filter comprising a dielectric substrate, electrodes formed on both principal planes of said dielectric substrate, at least a pair of polygonal openings formed respectively in said electrodes, upper and lower conductors arranged while leaving gaps relative to said dielectric substrate, resonance areas formed between said openings, and input/output electrodes disposed for being electromagnetically coupled with said resonance areas, and
• a common input/output electrode interconnecting one of the input/output electrodes of said first filter and one of the input/output electrodes of said second filter;
• wherein said openings each have corners and one corner of each opening is different in shape from the other corners of that opening.

A filter comprising:

• a dielectric substrate,
• electrodes formed on both principal planes of said dielectric substrate,
• at least a pair of polygonal openings formed respectively in said electrodes,
• upper and lower conductors arranged while leaving gaps relative to said dielectric substrate,
• resonance areas formed between said openings, and
• input/output electrodes disposed for being electromagnetically coupled with said resonance areas;
• wherein said openings each have corners and one corner of each opening is different in shape from the other corners of that opening.

A communication apparatus comprising:

• at least a duplexer, a transmitting circuit, and a receiving circuit,
• said duplexer being made up of a transmitting filter comprising a dielectric substrate, electrodes formed on both principal planes of said dielectric substrate, at least a pair of polygonal openings formed respectively in said electrodes, upper and lower conductors arranged while leaving gaps relative to said dielectric substrate, resonance areas formed between said openings, and input/output electrodes disposed for being electromagnetically coupled with said resonance areas;
• a receiving filter comprising a dielectric substrate, electrodes formed on both principal planes of said dielectric substrate, at least a pair of polygonal openings formed respectively in said electrodes, upper and lower conductors arranged while leaving gaps relative to said dielectric substrate, resonance areas formed in portions of said dielectric substrate sandwiched between said openings, and input/output electrodes disposed for being electromagnetically coupled with said resonance areas;
• and a common input/output electrode interconnecting one of the input/output electrodes of said first filter and one of the input/output electrodes of said second filter,
• said transmitting circuit being connected to said transmitting filter, and said receiving circuit being connected to said receiving filter;
• wherein said openings each have corners and one corner of each opening is different in shape from the other corners of that opening.