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A balanced, series-fed microstrip array antenna having 8 elements is investigated. The transmission line which feeds the elements is located below the elements plane. It is shown that the bandwidth of the antenna is 10% for SWR = 2, and that the average sidelobe level is −19 dB. The gain varies between 6.2 to 11.8 dBi. Very low cross-polarization was achieved.
We present here two linear arrays mounted in the same aperture: the first array with 4 elements at 2.7 GHz (spacing 0.7λ) and the second array with 4 elements at 7.0 GHz (spacing 1.8λ). It is shown that by special design of the single high frequency element grating lobes are eliminated. The isolation between the two arrays is better than 14 dB.
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