A one-dimension single-polarized tapered slot antenna array fed by microstrip line is proposed. A modified transformer is used to obtain the impedance matching from microstrip line to slot line in the operating band. A 1: 8 microstrip line power divider is designed to feed the 8-element array. The experimental results also show that the proposed antenna array achieves a ratio impedance bandwidth of 16.5:1 for VSWR < 2 from 0.8 to 13.2 GHz, and exhibits good radiation patterns over the operating band that the cross polarized levels are better than 15 dB.
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