An electronically scanned array with beam switching using a coupled phase-locked loop array

This paper presents an ESA with beam-switching capability. Using a type-II CPLLA and a reference signal, this EAS steers its pattern by a DC control voltage, reduces the beam-pointing error arising from phase errors, and holds its operating frequency stably at the reference frequency. By one switch and two buffer amplifiers, it switches its pattern between the sum and difference patterns. Utilizing prescalers, its beam-scanning range is significantly extended. Thus, it has the potential for target tracking applications.