Filter formed by loading metal wire on microstrip line

Abstract

The utility model discloses a filter formed by loading a metal wire on a microstrip line. The filter comprises the microstrip line and the metal wire, the metal wires are connected with the central conduction band of the microstrip line and are periodically distributed on one side of the central conduction band of the microstrip line; the lengths of the metal wires are gradually reduced, the reduction amplitudes are different from one another, when the metal wires are long at the beginning, the reduction amplitude of the lengths of the metal wires is small, and when the metal wires are short at the back, the reduction amplitude of the lengths of the metal wires is large; the widths of the metal wires are the same; the filter formed by loading the metal wire on the microstrip line has a band-stop effect, and is simple in structure and convenient to manufacture.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of microwave filter, especially is a kind of filter based on microstrip line. BACKGROUND

[0002] Filter is an important microwave component, and has wide application in microwave communication field.The filter based on microstrip line is compatible with planar technology, so it attracts the interest of many researchers.However, the filter based on microstrip line is mostly low-pass or band-pass filter, and the band-stop filter structure based on microstrip line is very few, and in practical application, band-stop filter with various characteristics is also needed, therefore, the utility model provides a filter based on microstrip line with band-stop effect. SUMMARY

[0003] The utility model provides a filter based on microstrip line with band-stop effect to solve the technical problems.

[0004] To achieve the above object, the utility model adopts the following technical scheme: a filter formed by loading metal wire on microstrip line, including microstrip line, metal wire;The metal wire is connected with the center conductor of microstrip line, and is periodically distributed on one side of the center conductor of microstrip line;

[0005] The length of the metal wire gradually decreases, and the amplitude of decrease is different before and after, when the metal wire is longer at the beginning, the amplitude of decrease of the length of the metal wire is smaller, and when the metal wire is shorter later, the amplitude of decrease of the length of the metal wire is larger;

[0006] The width of the metal wire is the same.

[0007] Preferably, in the filter formed by loading metal wire on microstrip line, the microstrip line is realized by double-sided printed circuit board.

[0008] Compared with prior art, the filter based on microstrip line provided by the utility model has band-stop effect, and the structure is simple and convenient to manufacture. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is the structural schematic diagram of an embodiment of the utility model;

[0010] Figure 2 It is the utility model Figure 1 It is the enlarged view of part A in the utility model;

[0011] Figure 3 It is the filter formed by loading metal wire on microstrip line provided by the utility model, that is Figure 1 The transmission characteristic curve of the structure shown. Detailed Implementation

[0012] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0013] It should be noted that when a component is described as being "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is described as being "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0014] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0015] The filter formed by loading metal lines onto a microstrip line includes a microstrip line and metal lines. The metal lines are all connected to the central conduction band of the microstrip line and are periodically distributed on one side of the central conduction band of the microstrip line. The length of the metal lines gradually decreases, and the rate of decrease is different at the beginning. When the metal lines are longer, the rate of decrease in the length of the metal lines is smaller, and when the metal lines are shorter, the rate of decrease in the length of the metal lines is larger. The width of the metal lines is the same.

[0016] Preferably, in the filter formed by loading metal lines on a microstrip line, the microstrip line is implemented using a double-sided printed circuit board.

[0017] One embodiment of this utility model is as follows: Figure 1 , Figure 2 As shown, the filter formed by loading metal lines on a microstrip line includes a microstrip line 1 and a metal line 2; the metal line 2 is connected to the central conductor 3 of the microstrip line and is periodically distributed on one side of the central conductor 3 of the microstrip line.

[0018] The length of the metal wire 2 gradually decreases, and the rate of decrease is different at the beginning and the end. When the metal wire is longer at the beginning, the rate of decrease in the length of the metal wire is smaller, and when the metal wire is shorter later, the rate of decrease in the length of the metal wire is larger.

[0019] All metal lines 2 have the same width. Furthermore, the microstrip lines are implemented using a double-sided printed circuit board.

[0020] According to the technical solution proposed in this utility model, we fabricated a sample using a double-sided printed circuit board with a dielectric constant of 2.65 and a dielectric substrate thickness of 1.0 mm. The width of the center conductor of the microstrip line was 2.73 mm. Eight metal lines were loaded on one side of the center conductor of the microstrip line. The length of the first metal line from the left end was l = 18 mm. The length of the second metal line was 0.5 mm less than the first, the third metal line was 0.5 mm less than the second, and so on. However, with the sixth metal line, the reduction in length increased to twice its original value, and its length was 1.0 mm less than the fifth metal line. Similarly, the length of the seventh metal line was 1.0 mm less than the sixth, and the length of the eighth metal line was also 1.0 mm less than the seventh. The width of all metal lines was w = 0.2 mm. The distance between any two adjacent metal lines was d = 5.8 mm.

[0021] Figure 3 Given Figure 1 The transmission characteristic curve of the structure shown is derived from... Figure 3 It can be seen that a |S| appears in the frequency range of 2.31 GHz to 3.02 GHz. 21 |A stopband less than -45dB, therefore, utilizing Figure 1 The structure shown can realize a microstrip line-based bandstop filter.

[0022] It should be noted that the above-mentioned technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification; and, for those skilled in the art, improvements or modifications can be made based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims of this utility model.

Claims

1. A filter formed by loading a microstrip line with a metal line, characterized by, The metal wires are connected with the center conductor of the microstrip line and are periodically distributed on one side of the center conductor of the microstrip line. The length of the metal wires gradually decreases, and the decreasing amplitude is different before and after. The width of the metal wires is the same.

2. The filter formed by loading a metal line on a microstrip line according to claim 1, wherein The microstrip line is realized by using a double-sided printed circuit board.

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