Antenna apparatus including multiple antenna portions on one antenna element

A wireless communication apparatus transmitting and receiving multiple radio signals, the wireless communication apparatus comprising an antenna apparatus,

• wherein the antenna apparatus comprising a first and a second feed ports respectively provided at positions on an antenna element, the antenna element being simultaneously excited through the first and the second feed ports so as to simultaneously operate as a first and a second antenna portions respectively associated with the first and the second feed ports,
• wherein the antenna apparatus further comprises:
• an electromagnetic coupling adjuster provided between the first and the second feed ports, the electromagnetic coupling adjuster changing a resonant frequency of the antenna element and producing isolation between the first and the second feed ports at a isolation frequency;
• and
• impedance matching circuits for shifting an operating frequency of the antenna element from the changed resonant frequency to the isolation frequency.