A Switched Dual Antenna Array for Mobile Computing Networks

International Journal of Electronics, Vol. 89, No. 4, 2002, pp. 325-335.

Abstract: The 2.4 GHz license-free ISM band is used extensively for hosting high performance mobile computing networks. The demand for wireless mobile computing networks with high aggregate throughput and channel quality, are countered by the high levels of multipath noise in indoor environments. Although the use of directive antennas has shown good results in overcoming the multipath effect, antennas with large directivity cannot be used in a mobile computing network without affecting the functionality of the wireless protocol used. This paper presents a solution to this problem, introducing a dual antenna diversity scheme for the 2.4 GHz ISM band and its beam selector circuit for controlling the diversity scheme. The proposed antenna produces an omni-directional pattern and two directional patterns with very large nulls in their azimuth pattern, while its low complexity and low cost allows easy integration into consumer products.

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