Antenna apparatus and radio communication apparatus

A radio communication apparatus, comprising:

• an antenna apparatus including
• a feeding electrode;
• a loop-shaped radiation electrode in a non-ground region of a substrate to operate at a resonance frequency in a basic mode and a resonance frequency in a higher mode,
• the feeding electrode having a first end connected to a feeding portion to supply a current of a predetermined frequency,
• the loop-shaped radiation electrode extending in a state where a base end of the loop-shaped radiation electrode is connected to a second end of the feeding electrode and having an open end facing the second end of the feeding electrode;
• a capacitance portion to pass a current of the resonance frequency in the higher mode and to block a current of the resonance frequency in the basic mode, the capacitance portion being formed by a gap between the open end of the loop-shaped radiation electrode and the feeding electrode;
• a first reactance circuit to pass a current of the resonance frequency in the basic mode and to block a current of the resonance frequency in the higher mode, the first reactance circuit being disposed near the capacitance portion on a side of the base end of the loop-shaped radiation electrode;
• and
• a second reactance circuit to pass a current of the resonance frequency in the higher mode, the second reactance circuit being disposed near a position on a side of the open end of the loop-shaped radiation electrode where a maximum current of the resonance frequency in the higher mode is obtained.