The Wullenweber antenna for the secondary surveillance radar is proposed and numerically analyzed. The unbalanced fed ultra low profile inverted L antenna with a rectangular parasitic element is used as element antenna. The actual gain of element antenna is 7 dB. The three element phased array antenna mounted on the side of sixty-gonak pyramid with its radius of base surface of 1,400 mm is studied at the design frequencies from 1.03 GHz to 1.09 GHz. The element antennas are excited with same amplitude and phase delay with 60 degrees. The directivity becomes 14.2 dBi at the elevation angle of 19 degree.
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