Dual frequency band integrated antenna array

Frequently, the antennas of collocated Primary Surveillance Radar (PSR) and Secondary Surveillance Radar (SSR) are situated separately with a common rotational axis. That is not too advantageous in modern individual secondary radar systems, where large vertical apertures (LVA) antennas, quite comparable with the vertical aperture of the PSR antenna are more popular due to their higher gain and lower earth reflection induced problems. A design of new integrated antenna arrays of 3-D PSR and MSSR with no compromise regarding the antenna parameters is presented.