Filter based on Chebyshev impedance transformer network technology

Abstract

The invention relates to a filter based on Chebyshev impedance transformer network technology. The filter comprises the following design steps: giving pass band and stop band insertion attenuation values of the filter to be designed, and obtaining the number N of elements of a low-pass filter and normalized element values according to the corresponding technical formulas, charts and parameters; according to the cut-off frequency and signal source internal resistance of the filter, selecting structure style (capacitor input type or inductor input type) of a ladder network, and calculating true value of each element; calculating and selecting characteristic impedance values of high / low impedance of transmission line section, and calculating lateral dimension of each transmission line; and calculating the length of each high / low impedance line section according to actual element values of the filter. The filter has the advantages of small structure dimension, easy processing and manufacturing, easy element matching and the like, has good linearity, has adjustable parameters, and finally, gives a computer simulation result; and the integratedly-design microwave filter needs the minimum elements.

Description

technical field [0001] The invention relates to a filter design based on Chebyshev impedance transformation network technology, which belongs to the field of microwave electronic circuits. Background technique [0002] With the advent of the information age, signal processing and filter design have become an indispensable content in the field of information science and technology. However, the basic theory of filter design has not changed for half a century, and the existing technology only supports one filter implementation method, such as passive LRC filter, active RC filter, digital filter, switched capacitor filter The first step from index requirements to actual design is based on the basic work of many predecessors such as O.J.Zoble and R.M.Foster. The resulting design theory has led to the stylization of the initial design of the filter: transforming the given index into a transfer function in the S domain or z domain, or into an LC filter structure. Designing filte...

AI Technical Summary

Problems solved by technology

However, the basic theory of filter design has not changed for half a century, and the existing technology only supports one filter implementation method, such as passive LRC filter, active RC filter, digital filter, switched capacitor filter The first step from index requirements to actual design is based on the basic work of many predecessors such as O.J.Zoble and R.M.Foster

Images