Abstract
A dual polarised four-beam antenna array for the 1850-1990 MHz frequency band is presented. The polarisations are /spl plusmn/45/spl deg/ to vertical. The antenna has eight inputs corresponding to two orthogonal polarisations and four beams. The return loss and cross-polar isolation for a single Butler beam exceeds 15 and 22 dB, respectively. The radiation pattern is similar to an ideal Butler pattern and the cross-polarisation level is <-21 dB in the beams.
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