Filter apparatus and radio-frequency front end circuit incorporating the same

A filter apparatus comprising:

• an input terminal;
• a first ground electrode and a second ground electrode opposed to each other;
• a first filter connected to the input terminal and having a first passband;
• and
• a second filter connected to the input terminal and having a second passband higher than the first passband;
• wherein
• each of the first filter and the second filter includes resonators in a plurality of stages between the first ground electrode and the second ground electrode;
• a first resonator in a first stage connected to the input terminal in the first filter includes:
• a first capacitor connected to the second ground electrode;
• and
• a first inductor connected between the first capacitor and the first ground electrode;
• a second resonator in a first stage connected to the input terminal in the second filter includes:
• a second capacitor connected between the input terminal and the second ground electrode;
• and
• a second inductor connected between the second capacitor and the second ground electrode;
• and
• the second inductor includes:
• a first via connected to the second capacitor;
• a second via connected to the second ground electrode;
• and
• a first line electrode connecting the first via and the second via to each other.