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 S11 value is –31.78 dB. The measured transmission coefficients (S21 and S31) 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.