Abstract
Based on substrate integrated waveguide (SIW) technology and the standard single layer printed circuit board (PCB) process, a slot antenna array with three beams at X-band is designed and realized. A slot antenna unit based on SIW technology is analyzed and designed at 10GHz. S parameters and radiation patterns are given. Finally, a 3×1 antenna array is connected with the Butler matrix as a beam-forming network. The antenna array can produce −45 degree, 45 degree and 0 degree beam when different input ports are excited. The antenna array has a peak isolation between input ports better than 30dB, and a peak gain of 10.5dBi.
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