Demonstrator of S band active antenna with T/R modules

The paper presents realization, mechanical solution and measurements results of transmit and receive systems used in the Demonstrator of S-band Active Antenna. The transmit system contains T/R modules, where individual module supplies half of antenna row of planar array. The 16 antenna rows form in elevation plane cosecant squared type transmit antenna pattern and fin-beam receive antenna pattern. In azimuth plane, pencil-beam radiation pattern is formed. Five elevation positions of the receive beam is electronically set by means of digital phase shifters and attenuators applied in a receive beam forming network. The results of antenna radiation pattern measurements on a tower setup are shown. Additional information about a Control and Diagnostic System is described as well.