Prof Josaphat invented many antennas for mobile satellite communications and radar. One of the antenna is Dual band circularly polarized antennas as shown above for mobile ground station of Engineering Test Satellite – VIII (ETS-VIII) of Japan. This antenna was developed by collaboration with National Institute of Communication Technology (NICT) in 2002-2006.
Reference :
Josaphat Tetuko Sri Sumantyo, Koichi Ito, and Masaharu Takahashi, “Dual Band Circularly Polarized Equilateral Triangular Patch Array Antenna for Mobile Satellite Communications,” IEEE Transaction on Antennas and Propagation, Vol. 53, Issue 11, pp. 3477 – 3485, November 2005 (New Jersey: IEEE) ISSN: 0018-926X
Josaphat Tetuko Sri Sumantyo and Koichi Ito, “Simple Satellite-Tracking Dual-band Triangular-patch Array Antenna for ETS-VIII Applications,” Radiomatics – Journal on Communications Engineering, Vol.2, No.1, May 2005 (Bandung: Radiomatics) Print ISSN 1693-5152
Mobile Satellite Communication Antenna, Japan patent No. 2003-014301, 23 January 2003.
Mobile Satellite Communication Antenna, International patent No. PCT/JP03/05162 or WO 2004/066443 (118 countries), 23 April 2003.