High Gain Microstrip Square Patch Array Antenna 4 x 4 Element 2.3 GHz for 5G Communication in Indonesia

Abstract

This paper presents the design and implementation of a microstrip square patch array antenna with 4x4 element operates on a frequency of 2.3 GHz, to be exact at 2.345 GHz for 5G communication in Indonesia. Antenna substrate is FR-4 Epoxy, in which $\varepsilon$r is 4.75, tan is 0.02), and height is 1.6 mm. This antenna is designed to have a gain greater than 10 dBi. In the This antenna design study, there are three stages. First, single element microstrip patch antenna design with gain 1.65 dBi, then a 2x2 array element with a gain of 7.18 dBi, and then an array of 4x4 element with a gain of 12.15 dBi. All antenna simulation design process using CST Microwave Studio. Based on the design results above, the microstrip square patch array antenna with 4x4 element with a gain of 12.15 dBi is selected, then fabricated into a prototype and its characteristic size in the anechoic space. Then measurement results are analyzed and compared with simulation. Based on the results of the simulation design square microstrip patch array antenna with 4x4 element for center frequency of 2.345 GHz, it is found that S11 of -12.20 dB or 1.26 VSWR with 61.7 MHz bandwidth, and gain of 12.15 dBi. Meanwhile, from the measurement results from the antenna prototype obtained S11 of-11.45 dB or VSWR 1.55 with a bandwidth of 58.2 MHz, and a gain of 12.08 dBi. This antenna is expected to be used as a alternative antenna for 5G communication in Indonesia at 2.3 GHz (S band) with gain above 10 dBi.