A New Type of High-Power Microwave Impedance Tuner Based on Load-Pull With a Rapid Calibration Method

Abstract

Abstract-For the measurement of microwave device in high-power, traditional methods are inefficient, inaccurate and not on-line real-time measurement. A new type of high-power microwave impedance tuner (26.5 GHz ∼ 40 GHz) based on load-pull technique and a corresponding rapid calibration method based on curve fitting are proposed. A new structure using increased width rectangular waveguide slotted in the center is adopted as the main transmission line. In order to prevent the leak of electromagnetic waves transferring in rectangular waveguide, two choke grooves are added in upper cover plate of the waveguide cavity. The results (standing wave ratio range of 1.02 ∼ 10.98, insertion loss of 0.063 dB at minimum standing wave ratio) show by practical measurement that this structure and method are feasible. The device can meet the requirement of design, and the new method has less time for calibration.

High‐power impedance tuner utilising substrate‐integrated evanescent‐mode cavity technology and external linear actuators

“…The design of traditional low-loss impedance tuners focuses on coaxial and waveguide mechanical approaches which employ motors for automatic control. While they usually handle high power and present good RF performance, mechanical tuners are bulky, heavy, expensive, and too slow for many applications [9,10]. Therefore, electronically tunable impedance tuners have recently attracted more attention [11][12][13].…”

Resonant Impedance Tuners: Theory, Design, Power Handling, and Repeatability

“…Some of these technologies include varactors and p-i-n diodes placed along transmission lines [14], [15], [16], [17], microelectromechanical systems (MEMS) [18], [19], and ferromagnetic tuners [20]. Another popular implementation is the coaxial slug impedance tuner [21], [22], [23]. Despite the wide variety of presented technologies, there has been very little work on rigorous designs that result in maximum impedance coverage or optimal loss.…”