Radio frequency front-end circuit

A radio frequency front-end circuit comprising:

• a duplexer circuit including a transmission filter set such that a fundamental frequency band of a transmission signal falls within a pass band of the transmission filter, and a reception filter set such that a fundamental frequency band of a reception signal falls within a pass band of the reception filter, a first end of the transmission filter and a first end of the reception filter being connected to each other through a common junction;
• a low noise amplifier connected to a second end of the reception filter;
• and
• a phase adjustment circuit connected between the reception filter and the low noise amplifier;
• wherein
• on a Smith chart that is divided into four quadrants by a first line representing pure resistance, and by a second line that interconnects points along an outer periphery of the Smith chart at each of which a phase is 90°, and a point of reference impedance, the phase adjustment circuit executes phase adjustment such that, at a particular frequency different from a fundamental frequency of the reception signal, a quadrant in which a phase of the low noise amplifier when looked at from the reception filter is present and a quadrant in which a phase when looking at the reception filter from the low noise amplifier is present are not in a conjugate relation and are positioned on opposite sides of the second line;
• and
• the phase adjustment circuit includes a first inductor connected between a first line electrode of a first balanced line connecting the reception filter and the low noise amplifier, and a ground, and a second inductor connected between a second line electrode of a second balanced line connecting the reception filter and the low noise amplifier, and the ground.