An antenna device for transmitting and receiving electromagnetic waves, wherein
the antenna device includes a transmitter section and a receiver section. The receiver
section includes a receiving antenna structure selectively switchable between a
plurality of configuration states. The antenna structure may be switched by a switching
device, which is controlled by a control device. The selective switching is effected
based upon a first measure representing a reflection coefficient measured at the
transmitter section. A method for transmitting and receiving electromagnetic waves
includes receiving a measure representing a reflection coefficient and controlling
a switching device to selectively switch an antenna structure between a plurality
of antenna configuration states in response to the measure representing the reflection coefficient.
