| As a key component of various wireless transmitters,power amplifiers are widely used in satellite communications and electronic countermeasures systems.Driven by the rapid development of military and civilian equipment,there are more and more application scenarios for high-power,ultra-wideband,and high-efficiency power amplifiers.Among them,solid-state power amplifiers have become the most popular due to their low operating voltage,small size,stable performance,and high synthesis efficiency.One of the millimeter wave radar transmitter power sources with application prospects and development potential.The power divider is one of the core components of the solid state power amplifier.The Gysel power divider adds an isolation resistance on the basis of the Wilkinson power divider to achieve a higher power capacity and provide more solutions for power distribution and synthesis in high-power microwave devices.In this paper,according to the application trend of power division network,the structure of the Gysel power divider is optimized and explored,and combined with the advantages of the rectangular waveguide low insertion loss and wide frequency band,the E-plane Gysel rectangular waveguide power divider with excellent performance is designed.A 100 W Ku-band solid-state power amplifier was completed based on the foundation.In this paper,the traditional Gysel circuit topology is successfully implemented on the Eplane rectangular waveguide.In order to expand the broadband performance,a branch is added between the two isolated ends of the traditional Gysel topology and multi-section stepped impedance matching is introduced to design a broadband E-plane Gysel rectangular waveguide.Splitters.Secondly,based on the T-junction,the Gysel isolation network is introduced through the waveguide probe transmission to design a plane-like two-channel Eplane Gysel waveguide power divider.On this basis,two 1:1 power dividers and unequal dividers are designed.: 1 power divider design A three-way equally divided Gysel rectangular waveguide power divider is implemented.The actual test results show that the isolation between the output ends is less than-16 dB,and the insertion loss is less than 0.3dB.The use of a three-way equally divided waveguide power splitter and two-way equally divided basic power amplifier module to achieve six-channel signal distribution and synthesis has realized the research of high-power Ku-band solid-state power amplifiers.First,the gain amplifier,driver amplifier and final stage power amplifier chip are selected according to the design index,and the basic power amplifier cavity combining two high isolation power splitters and waveguide-probe transition is simulated and designed,and finally the drive amplifier module and the final stage are used.The power amplifier module is cascaded,combining the three-way equally divided Gysel waveguide power divider and the two-way equally divided basic power amplifier cavity cascade to form a six-channel signal distribution and synthesis method.The output power in the 12-18 GHz working frequency band reaches100 W,passive power The combined network efficiency is greater than 92%,the power added efficiency is greater than 15%,and the power gain is greater than 53 dB,which meets the design specifications. |
