Microwave attenuator based on novel topological structure

Abstract

A microwave attenuator based on a novel topological structure comprises a plurality of periodical absorption structures, thin-film resistors and matched microstrip lines. Each periodical absorption structure comprises a low-impedance microstrip line and a resistor, grounding through punching is not needed, even absorption of high-frequency microwave signal energy is achieved, attenuation values of microwave signals of various frequencies in a working bandwidth are the same, reflection signals of any frequencies in the bandwidth can be reduced to an extremely-low level, and good matching is achieved. Compared with a traditional thin-film resistance attenuator, application frequency is substantially improved, in-band standing waves are improved, in-band flatness is good, punching is not needed, and the technology can be realized more easily.

Description

technical field [0001] The invention relates to a topology structure of a microwave attenuator, in particular to a microstrip attenuator comprising several periodic absorption structures, thin film resistors, and 50-ohm characteristic impedance microstrip lines, belonging to the field of microwave design. Background technique [0002] Attenuators are common components in microwave RF systems. Attenuators based on planar structures are a common circuit form in attenuator circuits, including Pi-type attenuators and T-type attenuators, which usually work in the frequency band below X. However, with the rapid development of communication, remote sensing, navigation and other industries and the continuous advancement of science and technology, the operating frequency of microwave radio frequency systems has been continuously improved, and Ka-band and even higher millimeter-wave frequency band microwave systems have begun to be used. [0003] At higher frequencies, such as in the...

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Problems solved by technology

[0003] At higher frequencies, such as in the Ka band, traditional Pi-type attenuators and T-type attenuators have the following problems: the parasitic parameters of the resistor itself, the microstrip connected to the resistor, etc. are greatly affected, resulting in a standing wave difference of the attenuator, which needs to be redesigned When the matching circuit is designed, the attenuation value deviates greatly from the theoretical calculation; the attenuation value slopes with the frequency, even if the matching circuit design is carried out, the in-band flatness is still poor; there must be a ground resistance, so there must be a ground via hole, and The performance of the attenuator is very sensitive to the distance from the ground via to the resistor, resulting in complex process implementation

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