A Compact Ultra‐Wideband Power Divider With Enhanced Performance and Error‐Tolerant Design Using Microstrip Lines

ABSTRACT This paper presents a compact ultra‐wideband (UWB) power divider that uses microstrip lines to achieve stable performance over a wide frequency range. The circuit is designed for wideband operation as well as being easily fabricated using standard FR‐4 substrate. Simulation results show that a bandwidth of 5.38 GHz is achieved in the frequency range of 1.6–7.0 GHz and the minimum S 11 value is –31.78 dB. The measured transmission coefficients (S 21 and S 31 ) are in close agreement with the simulated data, both around –3.56 dB, confirming consistent power splitting. The proposed design has been optimized through a detailed parametric study and demonstrates improved isolation and reduced reflection while maintaining simple rectangular geometry. Compared with previous multilayer or high‐cost laminate designs, the proposed FR‐4‐based divider achieves 125% fractional bandwidth and high fabrication tolerance while maintaining a simple geometry suitable for wide‐band microwave and communication systems.