Composite filter, duplexer and communication apparatus

A duplexer comprising:

• a single unitary dielectric block having an outer conductor on external surfaces thereof;
• a plurality of inner conductors disposed in the dielectric block;
• a plurality of filters with different frequencies, each said filter comprising a respective plurality of resonators, each said resonator comprising a corresponding one of said inner conductors;
• a first one of said filters being disposed in a first portion of said dielectric block and comprising substantially only a first dielectric material;
• a second one of said filters being disposed in a second portion of said dielectric block and comprising substantially only a second dielectric material;
• a coupling hole formed in said dielectric block between said first and second filters for coupling said first and second filters in common to an antenna connector;
• and
• the dielectric constant of said first dielectric material and the dielectric constant of said second dielectric material being different from each other;
• said first filter disposed in said first portion of said dielectric block is a transmitting-side filter;
• said second filter disposed in said second portion of said dielectric block is a receiving-side filter.

A duplexer comprising:

• a single unitary dielectric block having an outer conductor on external surfaces thereof;
• a plurality of inner conductors disposed in the dielectric block;
• a plurality of filters with different frequencies, each said filter comprising a respective plurality of resonators, each said resonator comprising a corresponding one of said inner conductors;
• a first one of said filters being disposed in a first portion of said dielectric block and comprising substantially only a first dielectric material;
• a second one of said filters being disposed in a second portion of said dielectric block and comprising substantially only a second dielectric material;
• a ground hole formed in said dielectric block between said first and second filters;
• and
• the dielectric constant of said first dielectric material and the dielectric constant of said second dielectric material being different from each other;
• said first filter disposed in said first portion of said dielectric block is a transmitting-side filter;
• said second filter disposed in said second portion of said dielectric block is a receiving-side filter.

A duplexer comprising:

• a single unitary dielectric block having an outer conductor on external surfaces thereof;
• a plurality of inner conductors disposed in the dielectric block;
• a plurality of filters with different frequencies, each said filter comprising a respective plurality of resonators, each said resonator comprising a corresponding one of said inner conductors;
• a first one of said filters being disposed in a first portion of said dielectric block and comprising substantially only a first dielectric material;
• a second one of said filters being disposed in a second portion of said dielectric block and comprising substantially only a second dielectric material;
• first and second external coupling holes formed in said dielectric block for coupling to said first and second filters, respectively;
• and
• the dielectric constant of said first dielectric material and the dielectric constant of said second dielectric material being different from each other;
• said first filter disposed in said first portion of said dielectric block is a transmitting-side filter;
• said second filter disposed in said second portion of said dielectric block is a receiving-side filter.