A Dual‐Band Fractal Radiator: Design and Performance Analysis

The growing demand for compact and efficient dual‐band antennas in modern wireless and satellite systems motivates the need for designs that offer high gain, low cross‐polarization, and broad operational versatility. Based on concentric spiral shape, developed from square iterations, this research proposes a low‐profile linearly polarized printed fractal radiator. Both the scaling factor ( Sf$$ {\mathrm{S}}_{\mathrm{f}} $$ ) and the rotation angle ( θ$$ \theta $$ ) control the design of the antenna, allowing it to operate in two bands with a fixed aperture. The suggested radiator attains resonance at 10.50$$ 10.50 $$ and 12.50$$ 12.50 $$  GHz, which correspond to X‐ and Ku‐band frequencies, using a RO‐5880 substrate with a dielectric constant 2.2. The simulated and measured findings demonstrate excellent agreement with gain of 9.67$$ 9.67 $$ and 11.28$$ 11.28 $$  dBi, cross‐polarization levels below −37$$ -37 $$  dB, and radiation efficiencies over 80%$$ 80\% $$ . The proposed small‐sized dual‐band antennas meet the need for efficient, innovative wireless and satellite systems. These findings confirm that the antenna is suitable for wireless and DBS applications, and they hint at its potential applicability to IoT and 5G with the minimal design up‐gradation.