Duplexer, substrate for duplexer, and electronic apparatus

A duplexer comprising:

• a transmit filter connected between a common terminal and a transmit terminal;
• a receive filter connected between the common terminal and a reception terminal;
• a capacitor connected in parallel with one of the transmit filter and the receive filter and provided between two terminals of the common terminal, the transmission terminal, and the reception terminal;
• an insulating layer;
• foot pads that include the common terminal, the transmission terminal and the reception terminal and are formed on one surface of the insulating layer;
• and
• an interconnection formed on another surface opposite to the one surface of the insulating layer,
• wherein the capacitor includes a capacitor forming unit formed with at least one foot pad of the foot pads and the interconnection formed to be included in an area where the at least one foot pad is formed.

A substrate for a duplexer comprising:

• an insulating layer;
• a mounting unit that mounts a transmit filter connected between a common terminal and a transmission terminal, and a receive filter connected between the common terminal and a reception terminal;
• a capacitor connected in parallel with one of the transmit filter and the receive filter and provided between two terminals of the common terminal, the transmission terminal, and the reception terminal;
• foot pads that include the common terminal, the transmission terminal and the reception terminal and are formed on one surface of the insulating layer;
• and
• interconnections formed on another surface opposite to the one surface of the insulating layer,
• wherein the capacitor includes two capacitor forming units that are formed with at least one foot pad of the foot pads and two of the interconnections that overlap with two opposing sides of the at least one foot pad, and are connected in parallel with each other.

A substrate for a duplexer comprising:

• an insulating layer;
• a mounting unit that mounts a transmit filter connected between a common terminal and a transmission terminal, and a receive filter connected between the common terminal and a reception terminal;
• a capacitor connected in parallel with one of the transmit filter and the receive filter and provided between two terminals of the common terminal, the transmission terminal and the reception terminal;
• foot pads that include the common terminal, the transmission terminal, and the reception terminal and are formed on one surface of the insulating layer;
• and
• an interconnection formed on another surface opposite to the one surface of the insulating layer,
• wherein the capacitor includes a capacitor forming unit formed with at least one foot pad and the interconnection formed to be included in an area where the at least one foot pad is formed.

An electronic apparatus including a duplexer, the duplexer comprising:

• a transmit filter connected between a common terminal and a transmission terminal;
• a receive filter connected between the common terminal and a reception terminal;
• a capacitor connected in parallel with one of the transmit filter and the receive filter and provided between two terminals of the common terminal, the transmission terminal, and the reception terminal;
• and
• a package including:
• an insulating layer;
• foot pads that include the common terminal, the transmission terminal and the reception terminal and are formed on one surface of the insulating layer;
• and
• interconnections formed on another surface opposite to the one surface of the insulating layer,
• wherein the capacitor is composed of two capacitor forming units that are connected in parallel with each other and are formed with at least one foot pad of the foot pads and two of the interconnections that overlap with two opposing sides of the at least one food pad respectively.