Abstract:
Background In modern radar and communication systems, power amplifiers determine the system's transmission output power and bandwidth, thereby affecting key performance metrics such as operating range and resolution. As operating frequencies continue to rise, the output power of a single power amplifier device is limited and cannot fully meet the current demands of radar and communication systems for broadband and high power. Therefore, it is necessary to design power synthesizer to achieve multi-channel power synthesis.
Purpose In order to achieve broadband high-power synthesis output in the microwave bands, this paper presents a novel high-power, broadband four-way rectangular waveguide TE10 mode to circular waveguide TE01 mode conversion power synthesizer.
Methods This mode conversion power synthesizer consists of two parts, namely the structure of four rectangular waveguide TE10 mode synthesis and transformation to cross waveguide TE22 mode, and the structure of cross waveguide TE22 mode transformation to overmoded circular waveguide TE01 mode.
Results The simulation results show that in the Ku-band of 15.2−18.2 GHz, the synthesis efficiency of TE10-TE01 mode is greater than 99.4%, and it can withstand a maximum pulse power output of 1.6 MW. The back-to-back cold test of the experimental verification sample shows that the lowest synthesis efficiency of the power synthesizer in the frequency band of 15.2−18.2 GHz is 94%.
Conclusions The simulation results and cold test show that the mode conversion power synthesizer has the characteristics of wide working bandwidth, high synthesis efficiency, and high power capacity, which can effectively solve the problem of high-power synthesis output in microwave and millimeter-wave bands.
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