Design of a Broadband Miniaturized Microstrip Grid Array Antenna with Slow Wave Transmission Lines

This paper presents a broadband and miniaturized antenna based on zigzag slow-wave transmission line by analyzing the surface current distribution and radiation characteristics of the microstrip grid array antenna. The antenna has a total of eight grid elements, which change the long side of the traditional microstrip grid into a zigzag slow-wave transmission line, thereby reducing the lateral area of the antenna by 42.5%, and the impedance bandwidth is increased from the original 2.7% to 17.5%, the peak gain reaches 14dBi.