With the rapid advancement of wireless communication technologies, the importance of RF and microwave systems has significantly increased. Among various components within these systems, the power divider plays a critical role in efficiently distributing and combining signals across transmission and reception paths. In high-power environments such as satellite communication, radar systems, broadcast transmitters, and military communication equipment, power dividers must not only handle high power levels but also maintain low insertion loss and excellent reflection characteristics. To meet these demanding requirements, various power divider structures have been developed, with the Gysel power divider emerging as a promising solution due to its high power-handling capability, superior isolation, and efficient thermal dissipation characteristics. By utilizing grounded resistors, the Gysel structure offers high circuit stability and thermal performance. However, in high-frequency applications, high-power resistors exhibit parasitic inductance and capacitance due to their physical structure, causing performance degradation. These parasitic elements must be considered to ensure accurate circuit operation. In this paper, the impact of parasitic components in high-power resistors on the performance of a Gysel power divider is analyzed. A compensation circuit is proposed to mitigate these effects and improve impedance matching.
To verify the approach, a Gysel power divider operating at 400[MHz] is designed. The design achieves reflection loss and isolation loss below -20[dB] while maintaining equal in-phase output signals. Measurement results confirm that the compensation circuit effectively reduces the impact of parasitics, enhancing overall performance in high-power applications.