Patent ID: 6624789
Filing Date: 2003-09-23
Classification: H01Q

Abstract:
An antenna structure (1) comprising:a ground plane (10) having a first section (12) and a second section (14) galvanically connected to the first section (12); and an antenna system (22, 24) operable in a frequency band and disposed over the ground plane (10), the antenna system comprising a receive antenna (22) and a transmit antenna (24), wherein the receive antenna (22) comprises a first radiating element (30) disposed over the first section (12) of the ground plane (10), and a first grounding strip (34) for grounding the first radiating element (30) to the first section (12) of the ground plane (10); and the transmit antenna (24) comprises a second radiating element (40) disposed over the second section (14) of the ground plane (10), and a second grounding strip (44) for grounding the second radiating element (40) to the second section (14) of the ground plane (10), characterized by a slot (20) provided between the first section (12) and the second section (14) of the ground plane (10) for improving isolation between the receive antenna and the transmit antenna, wherein the slot has an effective length (L) substantially equal to a quarter wavelength of the frequency band.