2.2 Ghz S-Band Helical Antenna Design for Earth Surveillance LAPAN-TUBSAT Data Acquisition in Indonesia Regional Security

Abstract

It is necessary to have an LAPAN-TUBSAT (Lembaga Penerbangan dan Antariksa Nasional/ National Institute of Aeronautics and Space) (Technische University of Berlin Satellite) satellite data receiving system that is low cost and can be placed in various parts of Indonesia. This system will later spear head the data receiver and this meets all areas detected by the earth surveillance method in real time and can be recorded at the Earth Station. By using a helical antenna that is engineered independently with the rules of the S band at 2.22 GHz, it will be able to control the Indonesian region. The construction of this receiving antenna uses a helical antenna, a receiver antenna system that combines helix asa feed horn on a parabolic antenna is designed to be able to work at a center frequency of 2,220 MHz, a bandwidth of 27 MHz, LHCP polarization, and a minimum gain of 10 dB. With a Parabolic shaped reflection antenna with Prime Focus. With motor antenna is a full motion antenna with a perstep movement of 0.25 degrees on Azimuth and elevation. The Design will be acquisition the data from satellite, and with the helical antenna. The Helical that by requirement of the 2,22 GHz design. With the LHCP (Left Hand Circular Polarization) and with the a bandwidth of 27 MHz. for the antenna parabola as a catcher of signal from satellite we use type of Primefocus wichis the point focal in the central face of parabola and we will put feed Horn that include inside is the Helical feed antenna. Antenna have a spesification Movement is 0,25 degrees per second With the successful engineering of the development of Helical antenna, it can also later apply it to various other satellites with adjustments to the dimensions of the antenna only and the receiving system.