Filter, branching filter and communication apparatus

A branching filter comprising:

• a converter circuit, provided with a single-type common terminal and two balanced terminals, for performing conversion between a balanced line and an unbalanced line;
• two receiving filter units coupled respectively to the balanced terminals and two output terminals of the converter circuit and allowing passage of a signal in a pass band;
• a bridging capacitor arranged to extend across the converter circuit and one of the receiving filter units in a bridging manner;
• and
• a transmitting filter coupled between the common terminal and a transmitting terminal,
• wherein a first inductance at an output terminal of one of the receiving filter units is electromagnetically coupled to a second inductance at a balanced terminal of the other receiving filter unit.

A communication apparatus comprising a filter including:

• a converter circuit, provided with a single-type common terminal and two balanced terminals, for performing conversion between a balanced line and an unbalanced line;
• two filter units coupled respectively to the balanced terminals of the converter circuit and allowing passage of a signal in a pass band;
• and
• a bridging capacitor arranged to extend across the converter circuit and one of the filter units in a bridging manner,
• wherein a first inductance of an opposite-side line of one of the filter units relative to the converter circuit is electromagnetically coupled to a second inductance of a line coupling the other filter unit and the converter circuit.