A modified circular-patch monopole antenna's design and analysis are presented in this study. The antenna design is modest, measuring 21.5 × 13 × 1.6 mm3. Affordable FR4 dielectric material is utilized in the proposed antenna design. To achieve the ultra-wideband antenna operating frequency, the modified circular monopole antenna is changed by inserting the ellipse between the radiator and feedline with the rectangular slotted lowered ground plane. The proposed antenna operates in the 4.1–13.3 GHz frequency range. The ground plane alteration helps in enhancing the bandwidth in the lower as well as higher frequency of the antenna. The antenna has a reflection coefficient value of more than − 18 dB. Furthermore, in the UWB band, the antenna's lowest and highest gain values are 2 dB and 3.2 dB, respectively. Thus, it can be stated that the suggested antenna is appropriate for utilization in UWB applications.