Flat panel antennas (FPAs) have emerged as a crucial technology for satellite communication (SATCOM) applications that offering compact, lightweight, and electronically steerable solutions compared to traditional mechanically scanned antennas. This paper provides a comprehensive survey of FPAs, focusing on their design trends, integration with beamforming integrated circuits (BFICs), and key challenges in their development. The study explores advancements in phased array antennas, emphasizing their role in improving beam steering, efficiency, and scalability for next-generation SATCOM applications. A comparative analysis of existing FPA designs, frequency bands, and performance metrics is presented. Furthermore, this paper highlights major challenges such as thermal management, power efficiency, bandwidth limitations, and complexity in calibration. The future scope of FPAs is discussed, including the adoption of GaN-based amplifiers, hybrid beamforming techniques, and AI-driven optimization strategies. These advancements are expected to enhance the efficiency, scalability, and applicability of FPAs in satellite communications, 5G networks, and beyond.