CST – Computer Simulation Technology

Development of Electronically Scanned Planar Antenna Array for Airborne IFF Application
A.K. Singh, D.K. Tiwari, Reena Sharma, T. Balakrishnan
1st January 0001
IFF, monopulse comparator, scanning, phase shifters,beam steering unit
This paper describes the design and development of an Electronically Scanned airborne, lightweight IFF Planar Antenna Array for indigenous Airborne Surveillance system. The antenna aperture dimension has been fixed to 1.12m × 0.7m based on the platform constraint that gives aperture gain of 18 dB at boresight. The antenna configuration is optimized to make it compact and lightweight to meet the platform requirement. The antenna is capable of scanning ± 60° electronically in the azimuth plane with the help of 8 digital phase shifters and a Beam Steering Unit (BSU). The BSU has been designed and developed using state-of the art technology involving Xilinx Vertex2Pro based processor board and Phase shifter Interface Card (PIC). The sidelobe level requirement is -24 dB in azimuth plane. Also, there is a requirement of SUM and DIFFERENCE pattern from the same aperture for monopulse implementation with the DIFFERENCE pattern covering all the sidelobes of the SUM pattern to achieve Receiver Sidelobe Suppression (RSLS) functionality. The antenna needs to have a power handling capability of 5 kW (peak), 50 Watt (avg.) and weight less than 12 Kg. The theoretical design is carried out and implemented using microstrip line circuits. The simulation has been carried out in IE3D and the simulation results are found to be in good agreement with the measured results. The antenna is tested for its VSWR, impedance bandwidth, radiation pattern & gain. A bandwidth of 20% for a VSWR of 1.5:1 is achieved. The sidelobe level at boresight in azimuth plane is found to be better than -24 dB. The measured gain is better than 18.5 dBi over the operating frequency band. A satisfactory result is obtained in its scanning peformance.

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