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Slot Antennas With an Extended Ground for Multiple-Antenna Systems in Compact Wireless Devices

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2 Author(s)
Ming-Iu Lai ; Grad. Inst. of Commun. Eng., Nat. Taiwan Univ., Taipei ; Shyh-Kang Jeng

In this letter, new slot antennas with an extended ground are proposed. They are easily built as internal antennas in a compact wireless device. Originated from lambda/4 slot antennas, an additional vertical L-shaped metallic sheet as an extended ground and a main radiator is added to reduce the antenna size. The sheet is designed close to a ground plane, and its height can be chosen according to the available space of a given device. These features offer more design flexibility for antenna and mechanical engineers. In this letter, antennas for WLAN are designed and implemented as examples, and a four-element antenna design using the resultant antennas is demonstrated, showing that the multiple-antenna design occupies only a small region in the system board. With these design examples the proposed structures can be a promising solution for multiple-antenna systems in compact wireless devices.

Published in:

IEEE Antennas and Wireless Propagation Letters  (Volume:8 )