Filter based on Chebyshev impedance transformer network technology

A Chebyshev, network technology, applied in the direction of waveguide-type devices, electrical components, circuits, etc., can solve problems such as no change

Active Publication Date: 2016-01-13
CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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  • Abstract
  • Description
  • Claims
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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

Method used

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  • Filter based on Chebyshev impedance transformer network technology
  • Filter based on Chebyshev impedance transformer network technology
  • Filter based on Chebyshev impedance transformer network technology

Examples

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Embodiment Construction

[0089] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0090] This design adopts the electromagnetic simulation software ADS, based on the Chebyshev impedance transformation network technology, simulates the model through the network synthesis method, and designs a 2220-2290MHz lumped parameter filter.

[0091] 1. Design index requirements

[0092] Table 12220~2290MHz lumped parameter filter design requirements

[0093] name

Passband / MHz

Stopband / MHz

Ap / dB

As / dB

VSWR

Index value

2220～2290

2180 / 2330

＜0.3

＞40

＜1.2

[0094] 2. Design description and simulation schematic diagram

[0095] This design is a lumped parameter bandpass filter with passband frequency of 2220-2290MHz and stopband cutoff frequency of 2180MHz and 2330MHz respectively. The design structure based on Chebyshev type filter is adopted, and the optimal best component values. Its spe...

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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...

Claims

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Application Information

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IPC IPC(8): H01P1/203H01P1/202
Inventor 汤舰
Owner CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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