Abstract
Global System for Mobile Communication (GSM) is the most popular system used for mobile telecommunications especially in Europe and Asia. The critical success factors in GSM depends on the BTS (Base Transceiver Station) coverage, however in certain areas the signal is so weak and the communication can be lost. To solve this problem an additional antenna can be used on the user's side (mobile station) which is able to increase the received signal level. In this research, Helix antenna with variation of turn has implemented to be an aditional antenna in mobile device. The Helical antenna was designed on the 900 MHz which is known as GSM 900. The antenna was measured in order to obtain some parameters such as operating frequency, bandwidth, VSWR, gain, radiation pattern and HPBW. The measured results show that Helix antenna resonates at frequency 900 MHz with VSWR 1.09, bandwidth 50 MHz and HPBW 400. The qualitative test by implementing the Helix antenna directly connected to the GSM modem shows that the received signal level can increase about 6 dB.
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