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Abstract
VHF-A/G is a radio communication device operating in the frequency range of 117.975 MHz - 137 MHz. This device is utilized as a means of communication between Air Traffic Control officers at an Air Traffic Service (ATS) unit and pilots in aircraft. The VHF-A/G equipment is required to be placed inside the Control Tower, with the VHF-A/G antenna mandated to be positioned atop the Control Tower. Typically, antennas used are narrowband antennas, effective only in receiving or transmitting signals within specific frequencies. If one wishes to use such an antenna on other frequencies, adjustments (matching) are required. Hence, the author has conceptualized designing an antenna capable of operating across various frequencies within the VHF A/G frequency range. In the design process, electromagnetic simulations using CST Studio 2021 allow for in-depth analysis of antenna characteristics, including impedance, radiation efficiency, and radiation patterns. It is hoped that simulation results demonstrate that the resulting antenna can achieve performance meeting VHF A/G requirements, producing consistent radiation patterns and high efficiency across the targeted frequency range.