ABSTRACT
II
ABSTRACT
Although the traditional technique of impedance matching can not realize fast and
stablely dynamic load match, its load, in many industrial applications, including the
plasma applications and microwave fluidizing drying, is dynamic, which calls for an
intelligent system of impedance matching for rapid detection and matching of dynamic
load. At present, such products have been developed in foreign countries, but not sold in
the domestic market. Thus, after the author making a research on a high-power
microwave intelligent technique of impedance matching, modeling and simulating with
the electromagnetism simulation software CST, and validating through establishing a
test system, a simple impedance matching system has been initially built.
This paper mainly studied the high-power microwave intelligent technique of
impedance matching by means of simulation and experiments, which contains triple
probe detection technology, three-pin tuned technology and a fast matching method.
The author made mathematical derivation of the formulae used for the operating
principles of triple probe detection and three-pin impedance tuner, establishing a test
system to verify its feasibility, among which the three-pin impedance tuner is
emphatically researched. Through simulation and experiments, the optimum pin spacing
with one-quarter of a guide wavelength was determined and tested. then the author
analyzed the matching range of three-pin impedance tuner through simulation
qualitative reasoning. Based on the above study, this article presents a method for fast
matching by means of cascaded rule and look-up table, combined with detection
technology and tuned technology, and introduces the process of intelligent impedance
matching, and verifies the result with the matching system. At last, the paper introduces
the photonic crystal waveguide by analyzing its working principle and model simulation,
and studied how to realize impedance matching with photonic crystal waveguide, along
with some factors influencing its adjustable range.
The innovation of this paper is: First, analyzing the working principle of three-pin
impedance tuner by cascaded rule; second, presenting a method for fast impedance
matching through combining cascaded rule and look-up table; third, applying the
structure of photonic crystal waveguide into impedance tuner to get a new one.
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