With the development of communication technology, people have higher and higher requirements for communication quality. Traditional array antennas require complex feed networks and the necessary phase shifters. Conventional reflector antennas are bulky and difficult to manufacture. It is therefore necessary to analyze the traditional characteristics of reflective array antennas to accommodate future adaptability. The microstrip antenna has the advantages of small size, simple structure and small outer shape. Therefore, the working principle and design process of the reflective microstrip array antenna are introduced in detail. A dual-loop antenna operating at was designed, which simplifies the shape of the antenna and achieves a beam pointing of 30°. Compared with similar literature, the new unit antenna has a simple structure, can realize beam orientation without a phase shifter, can work in the low frequency range of 5G, and has high engineering value.