| 摘要 |
Devices (1) comprising antennas (2) for exchanging radio frequency signals are provided with conductive planes (11,12) with slots (10) comprising open ends and closed ends. Connection points (13,14) are located near the slots (10) more closely to the closed ends than to the open ends. The conductive planes (11,12) do not operate against ground surfaces, to keep the antenna small. Perimeters of the conductive planes (11,12) are between 50% and 200% of a wavelength of the radio frequency signals, to get sufficient antenna performances and bandwidths. Radio modules (16) with conductive shieldings are mounted on non-conductive areas (15) of the conductive planes (11, 12), to exchange radio frequency signals in three directions. The lengths of the slots (10) are 10%-50% of the wavelength. A distance (d) from the connection point (13,14) to a nearest side of the conductive plane (11,12) in a direction perpendicular to the slot (10) at the closed end is at least 2% of the wavelength. ® KIPO & WIPO 2007
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