A planar sector antenna suitable for small WLAN card terminal

In this paper, a planar antenna and the 6-sector arrangement for a small card type mobile terminal used in the wireless local area network (WLAN) system are proposed. The radiation characteristics, particularly the tilted main beam in vertical plane and current distribution are calculated and discussed. We show that the 6-sector beams of half power width of 60 degrees are obtained by the proposed arrangement that is in a rectangular configuration of 10.6 mm × 44 mm at 25 GHz band, and this is suited to a built-in antenna mounted on the edge of the card type mobile terminal like a PCMCIA card.