Filter apparatus

A filter apparatus comprising:

• a multilayer body including a plurality of dielectric layers that are layered, the multilayer body including a first surface and a second surface;
• an input terminal, an output terminal, and a ground terminal provided on the second surface;
• a ground electrode connected to the ground terminal;
• a plate electrode provided closer to the first surface than to the ground electrode;
• a first line electrically connected to the input terminal and the plate electrode;
• a second line electrically connected to the output terminal and the plate electrode;
• a third line and a fourth line connecting the plate electrode and the ground terminal to each other;
• and
• a first capacitor electrode and a second capacitor electrode between the plate electrode and the second surface, and connected to the first line and the second line, respectively;
• wherein
• the first line is capacitively coupled to the second line;
• and
• when the multilayer body is viewed in a plan view from a layering direction;
• the plate electrode covers a portion of a space providing capacitive coupling between the first line and the second line;
• the first capacitor electrode and the second capacitor electrode partially overlap with each other;
• and
• the plate electrode covers the first capacitor electrode and the second capacitor electrode.