Attenuator

Abstract

An attenuator is composed of a first resistor, a second resistor, and a micro-strip line. The length of the micro-strip line is lambda / 4, and the two ends of the micro-strip line are respectively connected with the first resistor and the second resistor. The first resistor and the second resistor are of the same resistance. Lambda is the wavelength corresponding to the center frequency of the attenuator. The attenuator of invention has the characteristics of simple structure, flexible design and compact structure, can adapt to the requirement of high bands, can be applied to various needed circuits and systems, and can be easily generalized to other bands, especially high bands. A series of difficulties in high-frequency application of attenuators are solved.

Description

technical field [0001] The present invention relates to an attenuator, in particular to an attenuator using a microstrip line, in particular to an attenuator with smaller parasitic parameters and lower precision requirements. Background technique [0002] Traditional MIC circuit attenuators include π-type attenuators and T-type attenuators. Among them, the π-type attenuator is widely used. However, it has many shortcomings in thin-film circuits and microwave high-frequency circuits, which limit its scope of application and frequency of use. [0003] figure 1 is the schematic diagram of the π-type attenuator model; figure 1 The resistance of the π-type attenuator in the 11 <-16dB, where S 11 is the reflection coefficient of the input port. [0004] Its main shortcomings and deficiencies are: [0005] (1) The resistance of the two grounding resistances of the π-type attenuator is large and the length is long, so the parasitic effect caused by the high frequency of th...

AI Technical Summary

Problems solved by technology

[0005] (1) The two grounding resistors of the π-type attenuator have a large resistance value and a long length, so the parasitic effect caused by the high-frequency microwave is relatively large, which leads to unsatisfactory simulation results obtained by calculating the theoretical resistance value and poor standing waves. The insertion loss value has a large deviation from the expected

[0006] (2) A microstrip connection is required between the three resistors, but the length and impedance of the microstrip connection itself are not included in the calculation, which further leads to poor standing waves, and the insertion loss value deviates from the expected value

[0007] (3) The three resistors are connected in π type, so it is difficult to adjust the resistance and connect them

[0008] (4) The resistance in the middle has extremely high requirements on precision, and has a great influence on standing wave and insertion loss

This causes the π-shaped attenuator to be prone to design deviation, and the resistance adjustment of the resistor is more complicated

It also limits its application in high frequency

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