Narrow Bandpass Filter for Next Indonesian Generation Coastal Surveillance Satellite Reception

Indonesia, with its long coastline, faces numerous challenges, including flooding and coastal erosion, which are intensified by climate change. Im-mediate detection and monitoring are crucial, and satellite technology plays an essential role in this process. This paper presents the design, development, simulation, fabrication, and analysis of a microstrip bandpass filter (BPF) tailored for coastal satellite reception in Indonesia. Operating within the 3.7 GHz to 4.2 GHz range, the BPF is designed to enhance signal quality by allowing the selective passage of desired frequency bands while reducing interference. The filter prioritizes high gain and narrow bandwidth, which improves the signal-to-noise ratio at the demodulator. The results show that the filter can be effectively integrated into coastal monitoring systems, providing a reliable tool for early warning and disaster prevention. It also contributes to advancements in RF filtering technology, designed for high precision under harsh environmental conditions.