Adaptive antenna apparatus including adaptive controller for adaptive controlling at least two antenna elements

A radio communication apparatus comprising:

• an adaptive antenna apparatus;
• and
• a radio communication circuit for transmitting and receiving a radio signal received by the adaptive antenna apparatus,
• wherein the adaptive antenna apparatus comprises at least two antenna elements including:
• a first antenna element having an electrical length L1 larger than λ/2 and equal to or smaller than a predetermined upper-limit wavelength, where λ is a wavelength of a radio signal, and
• a second antenna element having an electrical length L2 equal to or larger than a predetermined lower-limit wavelength and equal to or smaller than λ/2;
• and
• wherein the adaptive antenna apparatus further comprises a controller for adaptively controlling the adaptive antenna apparatus to form a radiation pattern of the adaptive antenna apparatus including a plurality of nulls substantively in a direction of an interference wave by adjusting at least one of an amplitude and a phase of each radio signal received by the first and second antenna elements.

A radio communication apparatus comprising:

• an adaptive antenna apparatus;
• and
• a radio communication circuit for transmitting and receiving a radio signal received by the adaptive antenna apparatus,
• wherein the adaptive antenna apparatus comprises:
• at least three first antenna elements respectively having electrical lengths L1, L1′ and L1″, each larger than λ/2 and equal to or smaller than a predetermined upper-limit wavelength, where λ is a wavelength of a radio signal;
• and
• a controller for adaptively controlling the adaptive antenna apparatus to form a radiation pattern of the adaptive antenna apparatus including a plurality of nulls substantively in a direction of an interference wave by adjusting at least one of an amplitude and a phase of each radio signal received by the respective first antenna elements, and
• wherein at least two of the electrical lengths L1, L1′ and L1″ are different from each other.