A Miniaturized Waveguide Impedance Matching Device

Abstract

The present invention provides a mini-type waveguide impedance match device. The device comprises a first waveguide tube, an impedance match gradual changing waveguide and a second waveguide radiation port. The first waveguide tube is filled with a high dielectric constant medium body; one end of the impedance match gradual changing waveguide is coaxially sleeved on a first waveguide tube, and the other end of the impedance match gradual changing waveguide is coaxially sleeved on second waveguide radiation port; and the first waveguide tube passes through the impedance match gradual changing waveguide and stretches into the second waveguide radiation port, and the length of the part, stretching into the second waveguide, of the first waveguide tube is smaller than the axial direction length of the second waveguide radiation port to form the impedance match between the first waveguide tube and the second waveguide tube. The high dielectric constant medium body in the first waveguide tube is led into the metal horn-shaped impedance match gradual changing waveguide and a cylindrical ridge waveguide radiation port, the calibers and the axial direction length of two ends of the horn-shaped metal impedance match gradual changing waveguide and the inner axial direction length of the part, stretching into the second waveguide radiation port, of the first waveguide tube are tuned to realize impedance matching.

Description

technical field [0001] The invention relates to the technical field of microwaves and antennas, in particular to a miniaturized waveguide impedance matching device. Background technique [0002] In the design of microwave devices, the characteristics of the transmission line are very important. Usually, the size and electrical performance characteristics of microwave devices are determined by the waveguide system of the transmission line. In the waveguide system, the metal waveguide is a hollow metal tube filled with a medium, which has the advantages of small conductor loss, large power capacity, simple structure, and no radiation loss. [0003] Ordinary metal waveguides are usually filled with air (or vacuum state), but some microwave devices contain high dielectric constant dielectric bodies, and high dielectric constant dielectric bodies are embedded in metal waveguides to form a For metal waveguides, the dielectric constant ε of the filled medium is generally greater t...

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Problems solved by technology

[0004] In the guided wave system, the commonly used impedance matching scheme between the metal waveguide filled with high dielectric constant dielectric body and the air (or vacuum) medium is the ladder impedance matching method. This matching method is usually based on the dielectric constant of the filled medium. ε and the air medium choose the dielectric constant to be ε 1 , ε 2 The medium of ...where ε>ε 1 >ε 2 ......>1, so that the metal waveguide aperture of the high dielectric constant dielectric body can be gradually changed to the same size as the ordinary metal waveguide. After optimization, the impedance matching with the metal waveguide filled with air medium can be realized. This matching The method not only has a large volume at the matching transition end, but also requires many types of media, and the process is difficult to realize and the cost is high. Moreover, the impedance matching performance is closely related to the length of the metal waveguide filled with a dielectric constant of ε, which makes this matching method in practical applications. The limitations are obvious

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