Authors: Yongguang Li, Ru Meng and Qi Zhu
Source: FERMAT, Volume 18, Communication 9, Nov-Dec, 2016
Abstract: A novel design of X-band digital high-power phase shifter (PS) based on ferrite-circulator is presented. As verification of the presented design, a digital high-power ferrite-circulator-based PS of 180° is designed. Simulated results show that return losses and insertion losses are better than -22.87dB and -0.32dB at center frequency 9.25GHz, respectively. Results also indicate great consistency in both states. A power-handling capacity of 280kW is achieved under vacuum condition, and the switching time is within the level of microsecond. Moreover, the proposed structure is easily fabricated.
Microwave phase shifter (PS) is very important in radar, communication systems. Specially, microwave PSs with high power-handling capacity are of great interest. There are many kinds of phase shifters widely used such as p-i-n diode PSs, mechanical waveguide PSs and ferrite PSs. A p-i-n diode PS has an extremely short response time, and its performance is great under low power-handling capacity [1]. A mechanical waveguide PS is suitable in high-power application but its switching time is dozens of millisecond, and it easily sparks [2]. A ferrite PS is widely used in radar system where high power and reliability in needed, and has a relatively short response time on the order of microseconds [3]. To realize higher power-handling capacity and shorter response time, a novel design of digital high-power PS based on ferrite-circulator for X-band is presented. Finally, a digital high-power ferrite-circulator-based PS of 180° at center frequency 9.25GHz is designed as verification of the presented design.
Index Terms: Digital high-power phase shifter, ferrite-circulator, switching time
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Investigation of X-band Digital High-Power Circulator-Based Phase Shifter