This paper presents a high altitude platform (HAP) communication system which applies the idea of satellite communication technology to it. The communication platform can offer extensive circular coverage on the ground when the base station and antenna are deployed on a high-altitude platform with a fixed height of 20 kilometers. The platform uses the theoretical concept of satellite communication to transfer the issues with air equipment to the ground in order to solve them because the current HAP communication system model will face significant challenges in its actual implementation, which will be primarily focused on the air base station side. By using merely a circularly polarized microstrip patch antenna, the antenna on the air base station side is made simpler. The ground terminal side adopts a combination of a small parabolic antenna and power amplifier (the power amplifier includes the downlink low-noise amplifier function, similar to the very small aperture terminal (VSAT)), which greatly reduces the size of the terminal antenna and is easy to operate and carry. At the same time, because the terminal side has a strong receiving capacity, it can ensure long-distance communication with high-altitude base stations.