With the proliferation of communications, the need to build small, compact, multi-band, and high-gain antennas are clearly felt. Therefore, researchers make great efforts to improve the radiation characteristics and reduce the size of the antenna (Lee et al., 2016). Over the past few decades, microstrip antennas have been widely used in this field. Microstrip antennas have advantages over conventional antennas, such as their small size, which is used in wireless devices, airplanes, and satellites. Various methods reduce the dimensions and increase the microstrip antenna gain (Balanis, 2005).Common methods for designing a multi-band antenna include fractalization, the use of various slots, incomplete ground structure, and parasitic elements. Also, antenna miniaturization methods include the use of high dielectric constant materials, short-circuit microstrip antennas, shorting posts, and the use of cross-slots. The use of materials with high dielectric constant causes surface waves and reduces bandwidth and efficiency. In the shorting post method, the input impedance of the antenna power supply is sensitized to the distance between the shorting posts and the power cable. The method of cross-slots of equal length in the center of the patch is used in double-band antennas. All methods have problems such as decreasing gain and increasing the size of the antenna (