A dual frequency band antenna for a multipurpose search radar for 250 - 1000 ton warships

Tactical requirements for a search radar for a small warship are difficult to implement in one single radar. The antenna presented solves this dilemma by allowing dual frequency band operation, in this case the C- and X-bands. The reasons for selecting these bands, and consideration on transmitter waveforms, are detailed. Design goals and results obtained are accounted for. A new manufacturing method has been selected which gives both good surface. The porous surface gives dramatically reduced wind loads. This means considerable savings in top weight, antenna-platform-mast, while retaining high system accuracy using track-while-scan, TWS. The accuracy is in the order of fractions of a milliradian, which matches the long range and small dispersion of modern medium-calibre naval guns.