A Compact and Wideband Wilkinson Power Divider Using Lowpass Microstrip Filters

Abstract

Power dividers are the most important tools in microwave systems such as mixers, frequency multipliers, and feeding networks in antennas. So far, in designing power dividers, various methods have been used to reduce the size and eliminate unwanted harmonics. In this paper, using a resonator structure and low pass filter, a Wilkinson power divider with I-shaped structure is designed, simulated, and fabricated. According to the results of the simulation, this structure has 6-harmonic elimination. The size of the designed power divider, due to the use of resonators, has dimensions of 0.06 × 0.07 λg2, which reflects a size reduction of 65% and indicates one of the advantages of this divider. The guided wavelength at the working frequency of the resonator is calculated at 0.97 GHz. This structure also has a relative working bandwidth of 42%, which indicates its wide operation band. The isolation value is −31 dB, which is another benefit of this power divider. This divider has been built and measured on the Rt-duroid 5880 substrate, where the responses from the simulation and real implementation have good match.