Ladas & Parry
Multiband antenna system for operating at L-band, S-band and UHF-band
 A multiband antenna system for operating at L-band, S-band and UHF-band. The antenna includes L-band antenna elements and S-band antenna elements provided in the form of quadrifilar helices spaced from each other on the surface of a hollow cylindrical insulator. UHF band antenna elements are provided in the form of a cage dipole on the surface of the hollow cylindrical insulator. The L-band antenna input is connected to a first connector through an L-band feed network card. The S-band antenna input is connected to a second connector through an S-band feed network card and the UHF-band antenna input is connected to a third connector through a split sheath balun provided along the axis of the hollow cylindrical insulator. 
Indian Space Research Organisation
H H
H01Q H01Q
inventional inventional
Thammaiahappa Kunhambu Lourdnathan Surendra Vodralli K. Changantidurga V. Venkatagiri Subramaniam Vaidyanathan Mallavalli L. Manickam
Mallikarjunaiah Sadanandan Nicholas Pal Lakshmeesha Subramanyam Subrahmanya Aswathnarayan Mahadevan Subramanya Kumar