Graphene has recently gained considerable attention for its potential role in microwave applications, primarily due to its tunable properties. Through the application of a voltage bias, graphene can shift its resistance values from high to low ranges, enhancing its appeal for various applications. In recent years, significant research interest has been directed toward single-layer carbon films, commonly referred to as graphene, along with modified carbon-based materials such as intercalated graphite, expandable graphite, reduced graphene oxide (RGO), and graphite exfoliation techniques. Producing a few layers of graphene is straight forward, and the cost-effectiveness of graphene does not compromise its tunability. At the midpoint between the microstrip lines, there are few-layer graphene (FLG) flakes, and these lines are connected to a voltage network analyzer at both ends. Utilizing FLG flakes is also applicable in designing tunable patch antennas. Elevating the bias voltage via the bias tees lowers the resistance of the graphene, consequently boosting the transmission across the microstrip line. A prototype has been tested to operate within the frequency range extending from direct current (DC) to 8 GHz. The measured coefficient varies between − 19 dB at 4.5 GHz, achieved by modulating the bias voltage from 2 V (representing minimum attenuation) to 6 V (representing maximum attenuation).