Radio Rib Antenna of RITSAT-2B (Download PDF)


Download PDF of This Page (Size: 410.61 K)

Radial Rib antenna (RRA) is a world class technology demonstrated in-orbit on 22.05. 2019 at 2: 20 pm IST in the RISAT-2B spacecraft. This 3.6 metre antenna was folded & stowed during launch and later successfully unfurled & deployed in-orbit. The deployment was completed in 7 mins and 20 seconds.

This image show in radio Rib antenna

This Image Show in Radio Rib Antenna

This image show in radio Rib antenna


  • This antenna was designed indigenously by ISRO team in a record time of 13 months. Alternate import option would have taken about 3 - 4 years. Successful deployment of RRA in RISAT-2B establishes the combination of all skills mastered by ISRO indigenously.

  • Implementation of light weight structure, hinge mechanism, design of newer mesh, actuators etc. , were some of the challenges involved in the realisation of this antenna.

  • All such key technological elements require very high level of expertise in handling space based antenna system, excellent workmanship and building redundancy apart from managing its in-orbit deployment.


  • RISAT-2B was placed into an orbit of 555 km with an inclination of 37 degree to the equator.

  • This is the fourth flight unit of the RISAT programme and it would be used for reconnaissance, strategic surveillance and disaster management.

  • ISRO successfully launched radar imaging satellite RISAT-2B on-board PSLV-C46 from Sriharikota.

  • It has been developed for military and general surveillance purposes. The data will also be used in fields of agriculture, forestry and disaster management support.

  • RISAT-2B is equipped with a synthetic aperture radar that can take pictures of the earth during day and night, and also under cloudy conditions.

  • With this advanced earth observation satellite, ISRO has introduced a complex new technology. That is a 3.6 metre unfurlable radial rib antenna. This is also going to be the technology of the future.

  • RISAT-2B is going to RISAT-2, which was placed in the orbit in 2009. RISAT-2 was RISAT-1’s replacement, a microwave remote sensing satellite that was launched in 2012. RISAT-2 was actively used India to monitor activities in camps across the border in Pakistan to thwart infiltration bids by terrorists.

- Published/Last Modified on: July 30, 2019

Science/Technology, Defense

Doorsteptutor material for CLAT GK-Current-Affairs is prepared by worlds top subject experts- fully solved questions with step-by-step exaplanation- practice your way to success.

Developed by: