Patent ID: 7405697

Claim:
A diversity radio antenna, comprising a ground substrate, first and second elongated antenna elements, each extending between respective first and second opposing ends thereof in a plane parallel to and spaced from the ground substrate, and an excitation electrode interposed between the respective first ends, each antenna element having one grounding point connectable to the ground substrate, wherein the first antenna element has a first ground connector switch means selectively connecting or disconnecting the first antenna grounding point to the ground substrate, and the second antenna element has a second ground connector switch means selectively connecting or disconnecting the second antenna grounding point to the ground substrate, wherein the first and second ground connector switch means are configured to connect both the first and second antenna elements to ground at the same time for adapting the antenna to a circularly-polarised radio wave, and the first and second ground connector switch means are also configured to connect one of the first and second antenna elements to ground, and to disconnect the other of the first and second antenna elements from ground for adapting the antenna to a linearly-polarised radio wave.