Antenna device and communication terminal apparatus

A communication terminal apparatus comprising:

• a plate-shaped radiating element arranged within a casing;
• a frame-shaped radiating element arranged along an inner side surface or an outer side surface of the casing to surround the plate-shaped radiating element;
• and
• a feeding unit that includes a feeding circuit and a frequency stabilizing circuit and that is connected between the plate-shaped radiating element and the frame-shaped radiating element;
• wherein
• the plate-shaped radiating element and the frame-shaped radiating element are connected to the feeding circuit through the frequency stabilizing circuit as a result of a first terminal portion of the frequency stabilizing circuit being connected to the frame-shaped radiating element, a second terminal portion of the frequency stabilizing circuit being connected to the plate-shaped radiating element, and a third terminal portion of the frequency stabilizing circuit being connected to the feeding circuit.