The applications of magnetrons are greatly limited because of the poor output spectrum of the free-running magnetron.Currently, one of the best ways to solve this problem is injection locking. However, the injection l...The applications of magnetrons are greatly limited because of the poor output spectrum of the free-running magnetron.Currently, one of the best ways to solve this problem is injection locking. However, the injection locking theory which is widely used nowadays is based on the simplified oscillator, which does not include the frequency pushing effect of the magnetron. In this paper, the theory of injection locking magnetrons with frequency pushing effect is systematically studied.Analytical analysis shows that the locking bandwidth turns larger with the consideration of the pushing parameter(α), and the increase of locking bandwidth is expanded with α increasing. Experimental results show that the locking bandwidth is expanded by 0.3 MHz, 1 MHz, and 1.6 MHz compared with the locking bandwidth from the conventional locking theory under an injection ratio(ρ) of 0.05, 0.075, and 0.1, respectively. This research provides a more accurate prediction of the properties of the injection-locked magnetron.展开更多
The response of uniaxial anisotropic ferromagnetic particles with linear reaction dynamics subjected to alternating current(AC)or direct current(DC)bias magnetic field is evaluated by the reaction-diffusion equation f...The response of uniaxial anisotropic ferromagnetic particles with linear reaction dynamics subjected to alternating current(AC)or direct current(DC)bias magnetic field is evaluated by the reaction-diffusion equation for the probability distribution function of the molecular concentration in the spherical coordinate system.The magnetization function and the probability distribution function of the magnetic particles in the reaction system are derived by using the Legendre polynomials and Laplace transform.We discuss the characteristics of magnetization and probability distribution of the magnetic particles with different anisotropic parameters driven by a DC and AC magnetic fields,respectively.It is shown that both the magnetization and the probability distribution decrease with time increasing due to the reaction process.The uniformity of the probability distribution and the amplitude of the magnetization are both affected by the anisotropic parameters.Meanwhile,the difference between the case with linear reaction dynamics and the non-reaction case is discussed.展开更多
基金Project supported by the Sichuan Science and Technology Program,China(Grant No.2019YFG0419)the National Natural Science Foundation of China(Grant No.61601312)
文摘The applications of magnetrons are greatly limited because of the poor output spectrum of the free-running magnetron.Currently, one of the best ways to solve this problem is injection locking. However, the injection locking theory which is widely used nowadays is based on the simplified oscillator, which does not include the frequency pushing effect of the magnetron. In this paper, the theory of injection locking magnetrons with frequency pushing effect is systematically studied.Analytical analysis shows that the locking bandwidth turns larger with the consideration of the pushing parameter(α), and the increase of locking bandwidth is expanded with α increasing. Experimental results show that the locking bandwidth is expanded by 0.3 MHz, 1 MHz, and 1.6 MHz compared with the locking bandwidth from the conventional locking theory under an injection ratio(ρ) of 0.05, 0.075, and 0.1, respectively. This research provides a more accurate prediction of the properties of the injection-locked magnetron.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.62001398 and 61731013)the China West Normal University of Sichuan,China(Grant Nos.416681 and 416682).
文摘The response of uniaxial anisotropic ferromagnetic particles with linear reaction dynamics subjected to alternating current(AC)or direct current(DC)bias magnetic field is evaluated by the reaction-diffusion equation for the probability distribution function of the molecular concentration in the spherical coordinate system.The magnetization function and the probability distribution function of the magnetic particles in the reaction system are derived by using the Legendre polynomials and Laplace transform.We discuss the characteristics of magnetization and probability distribution of the magnetic particles with different anisotropic parameters driven by a DC and AC magnetic fields,respectively.It is shown that both the magnetization and the probability distribution decrease with time increasing due to the reaction process.The uniformity of the probability distribution and the amplitude of the magnetization are both affected by the anisotropic parameters.Meanwhile,the difference between the case with linear reaction dynamics and the non-reaction case is discussed.
