Abstract
In the wireless local network (WLAN), the antennas with omnidirectional beam pattern are very useful due to wide scanning range. However, they have a relatively short scanning length because of a low antenna gain. This limitation could be more critical in higher frequency due to high atmospheric attenuation. To increase the antenna gain, the vertical array was employed (K. Wei, et al., “A MNG-TL Loop Antenna Array With Horizontally Polarized Omnidirectional Patterns,” IEEE Transaction on Antennas and Propagation, Vol.60, No.6, pp.2702–2710, 2012). However, the study on omnidirectionally steerable beam patterns is not nearly done.
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