CN204088530U - Nested type openings ring band stop filter - Google Patents

Abstract

The utility model discloses a kind of nested type openings ring band stop filter.It comprises substrate, input transmission line, exports transmission line, three under shed ring structure pasters, three rectangular patches, U-shaped paster, rectangular metal ground plates; The upper surface of substrate is provided with input transmission line, exports transmission line, three under shed ring structure pasters, three rectangular patches, U-shaped pasters, the lower surface of substrate is provided with rectangular metal ground plate, the input left end of transmission line is connected with the left end of substrate, the input right-hand member of transmission line is connected with the lower end, left side of U-shaped paster, export the left end of transmission line to be connected with the lower end, right side of U-shaped paster, export the right-hand member of transmission line to be connected with the right-hand member of substrate, three under shed ring structure pasters are equally spaced arranged on the upper surface of substrate.Nested type openings ring band stop filter of the present utility model has the advantages such as simple and compact for structure, filtering performance good, size is little, save material, quality is light.

Description

Nested Split Square Loop Bandstop Filter

technical field

The utility model relates to a microwave filter, in particular to a nested open square ring band rejection filter.

Background technique

With the rapid development of radio technologies such as radar technology and wireless communication, microwave radio frequency circuits and systems have received more and more attention. The microwave filter is one of the important components, and its performance determines the working quality of the system to a large extent. Systems with various functions have been developed one after another, making microwave spectrum resources increasingly tight and frequency intervals shrinking, which puts forward higher requirements for filters. Among them, the microstrip filter is widely used because of its high performance, small size, short design cycle, easy integration, and easy processing with photolithography technology. In recent years, the development of high-performance substrate materials has enabled microstrip filters to be applied in a large frequency range, making microstrip filters the most commonly used filter type.

The band stop filter is one of the important components of the filter, which is used to suppress signals in a certain frequency band and allow signals outside the frequency band to pass. According to the components used, it is divided into passive and active filters. Passive filter is a filter composed of only passive components, which is formed by using the principle that the reactance of capacitive and inductive components changes with frequency. Active filters consist of passive components and active devices. In recent years, there are also many literatures on the wide stopband low-pass filter. The wide stopband low-pass filter has the advantages of low in-band loss, small fluctuation, small reflection coefficient, etc., and has a wide stopband , which can effectively suppress high-frequency spurious signals, is an important direction for the development of today's filters.

Utility model content

The utility model provides a nested open square ring band-stop filter, and the technical scheme is as follows:

The nested open square ring band stop filter includes a substrate, an input transmission line, an output transmission line, three lower open ring structure patches, three rectangular patches, a U-shaped patch, and a rectangular metal ground plate; the upper surface of the substrate is provided with Input transmission line, output transmission line, three lower open ring structure patches, three rectangular patches, U-shaped patch, the lower surface of the substrate is provided with a rectangular metal grounding plate, the left end of the input transmission line is connected with the left end of the substrate, and the input transmission line The right end is connected to the left lower end of the U-shaped patch, the left end of the output transmission line is connected to the right lower end of the U-shaped patch, the right end of the output transmission line is connected to the right end of the substrate, and the three lower split ring structure patches are arranged at equal intervals. On the upper surface of the substrate, the upper ends of the three lower split ring structure patches are respectively connected to the lower ends of the three rectangular patches, and the upper ends of the rectangular patches on the left and right sides are respectively connected to the lower ends of the input transmission line and the output transmission line. The upper end of the patch is connected with the lower end of the U-shaped patch.

The substrate is made of glass fiber epoxy resin material, the length of the substrate is 17mm-19mm, and the width is 8mm-10mm. The length of the input transmission line and the output transmission line are both 6mm-7mm, and the width is 0.5mm-1.5mm. The arrangement spacing of the three lower split ring structure patches is 0.5 mm to 1.5 mm, and the lower split ring structure patch consists of the first square split ring patch, the second square split ring patch, and the third square split ring patch. Composed of patches and watch-shaped patches, the total length and width of the first square split ring patch are 3.5mm to 4.5mm, and the gap width is 0.1mm to 0.3mm; the total length of the second square split ring patch and the total width are 3.1mm to 3.3mm, and the gap width is 0.1mm to 0.3mm; the total length and total width of the third square split ring patch are both 2.3mm to 2.4mm, and the gap width is 0.1mm to 0.3mm; The watch-shaped patch is composed of two small rectangular patches and a large square patch. The side length is 0.4 mm to 0.6 mm. The lengths of the three rectangular patches are all 0.1mm-0.3mm, and the widths are all 0.9mm-1.1mm. The U-shaped patch is composed of two vertical rectangular patches and one horizontal rectangular patch. The patch has a length of 5.3 mm to 5.5 mm and a width of 0.5 mm to 1.5 mm. The length of the rectangular metal grounding plate is 17mm-19mm, and the width is 8mm-10mm.

The nested open square ring band-stop filter of the utility model has the advantages of simple and compact structure, good filtering performance, small size, material saving, light weight and the like.

Description of drawings

Fig. 1 is a schematic diagram of the front structure of a nested open square ring band-stop filter;

Fig. 2 is a schematic diagram of the back structure of a nested open square ring band-stop filter;

Fig. 3 is a structural schematic diagram of a lower split ring structure patch;

Fig. 4 is the filter performance curve diagram of nested open square ring bandstop filter;

Fig. 5 is a diagram of the surface current density distribution of the nested open square ring band-stop filter at 5.5 GHz.

Detailed ways

As shown in Figures 1 to 3, the nested open square ring band-stop filter includes a substrate 1, an input transmission line 2, an output transmission line 3, three lower open ring structure patches 4, three rectangular patches 5, and a U-shaped patch sheet 6, rectangular metal ground plate 7; the upper surface of the substrate 1 is provided with an input transmission line 2, an output transmission line 3, three lower split ring structure patches 4, three rectangular patches 5, a U-shaped patch 6, and the substrate 1 The lower surface is provided with a rectangular metal ground plate 7, the left end of the input transmission line 2 is connected to the left end of the substrate 1, the right end of the input transmission line 2 is connected to the left lower end of the U-shaped patch 6, and the left end of the output transmission line 3 is connected to the U-shaped patch 6 The right end of the output transmission line 3 is connected to the right end of the substrate 1, the three lower split ring structure patches 4 are arranged on the upper surface of the substrate 1 at equal intervals, and the upper ends of the three lower split ring structure patches 4 They are respectively connected to the lower ends of the three rectangular patches 5, the upper ends of the rectangular patches 5 on the left and right sides are respectively connected to the lower ends of the input transmission line 2 and the output transmission line 3, and the upper end of the middle rectangular patch 5 is connected to the U-shaped patch 6. The lower end is connected.

The substrate 1 is made of glass fiber epoxy resin material, the length of the substrate 1 is 17mm-19mm, and the width is 8mm-10mm. The length of the input transmission line 2 and the output transmission line 3 is 6mm-7mm, and the width is 0.5mm-1.5mm. The arrangement spacing of the three lower split ring structure patches 4 is 0.5mm to 1.5mm, and the lower split ring structure patch 4 is composed of the first square split ring patch 8, the second square split ring patch 9, the second square split ring patch Three square split ring patches 10 and a watch-shaped patch 11, wherein the total length and total width of the first square split ring patch 8 are 3.5 mm to 4.5 mm, and the width of the gap is 0.1 mm to 0.3 mm; The total length and total width of the split ring patch 9 are both 3.1 mm to 3.3 mm, and the gap width is 0.1 mm to 0.3 mm; the total length and total width of the third square split ring patch 10 are both 2.3 mm to 2.4 mm, The width of the notch is 0.1mm-0.3mm; the watch-shaped patch 11 is composed of two small rectangular patches and a large square patch, the length of the two small rectangular patches is both 0.4mm-0.6mm, and the width is 0.1mm. mm～0.3mm, the side length of the large square patch is 0.4mm～0.6mm. The lengths of the three rectangular patches 5 are all 0.1mm-0.3mm, and the widths are all 0.9mm-1.1mm. The U-shaped patch 6 is composed of two vertical rectangular patches and one horizontal rectangular patch, wherein the lengths of the two vertical rectangular patches are both 1.4mm-1.6mm, and the widths are 0.3mm-0.5mm. The length of the rectangular patch is 5.3 mm to 5.5 mm, and the width is 0.5 mm to 1.5 mm. The length of the rectangular metal grounding plate 7 is 17mm-19mm, and the width is 8mm-10mm.

Example 1

A glass fiber epoxy resin material with a dielectric constant of 4.4 is selected to make a microstrip substrate with a thickness of 1.6mm. The substrate has a length of 18 mm and a width of 9 mm. Both the length of the input transmission line and the output transmission line are 6.5mm, and the width is 1mm. The arrangement spacing of the three lower split ring structure patches is 1mm, and the lower split ring structure patch consists of the first square split ring patch, the second square split ring patch, the third square split ring patch, and the watch-shaped patch Composition, wherein the total length and total width of the first square split ring patch are both 4mm, and the gap width is 0.2mm; the total length and total width of the second square split ring patch are both 3.2mm, and the gap width is 0.2mm; The total length and width of the third square split ring patch are both 2.3mm, and the gap width is 0.2mm; the watch-shaped patch is composed of two small rectangular patches and a large square patch, of which two small rectangular patches The length of each is 0.5mm, the width is 0.2mm, and the side length of the large square patch is 0.5mm. The three rectangular patches all have a length of 0.2 mm and a width of 1 mm. The U-shaped patch is composed of two vertical rectangular patches and one horizontal rectangular patch. The length of the two vertical rectangular patches is 1.5mm, and the width is 0.4mm. 1mm. The rectangular metal ground plate has a length of 18mm and a width of 9mm. The various performance indicators of the nested open square ring band-stop filter are tested with CST software, and the obtained S-parameter curve is shown in Figure 4. It can be seen from Figure 4 that in the frequency band of 4.64GHz to 6.26GHz, the transmission coefficients are all less than -3dB, and a good band-stop filtering function is realized. Figure 5 shows the surface current density distribution of the filter at 5.5GHz.

Claims (7)

1. a nested type openings ring band stop filter, it is characterized in that comprising substrate (1), input transmission line (2), export transmission line (3), three under shed ring structure pasters (4), three rectangular patches (5), U-shaped paster (6), rectangular metal ground plate (7), the upper surface of substrate (1) is provided with input transmission line (2), export transmission line (3), three under shed ring structure pasters (4), three rectangular patches (5), U-shaped paster (6), the lower surface of substrate (1) is provided with rectangular metal ground plate (7), the left end of input transmission line (2) is connected with the left end of substrate (1), the right-hand member of input transmission line (2) is connected with the lower end, left side of U-shaped paster (6), the left end exporting transmission line (3) is connected with the lower end, right side of U-shaped paster (6), the right-hand member exporting transmission line (3) is connected with the right-hand member of substrate (1), three under shed ring structure pasters (4) are equally spaced arranged on the upper surface of substrate (1), the upper end of three under shed ring structure pasters (4) is connected with the lower end of three rectangular patches (5) respectively, the upper end of the rectangular patch (5) of the left and right sides respectively with input transmission line (2), the lower end exporting transmission line (3) is connected, the upper end of middle rectangular patch (5) is connected with the lower end of U-shaped paster (6).

2. a kind of nested type openings ring band stop filter as claimed in claim 1, it is characterized in that described substrate (1) is glass-epoxy material, the length of substrate (1) is 17mm ~ 19mm, and width is 8mm ~ 10mm.

3. a kind of nested type openings ring band stop filter as claimed in claim 1, it is characterized in that described input transmission line (2), export transmission line (3) length be 6mm ~ 7mm, width is 0.5mm ~ 1.5mm.

4. a kind of nested type openings ring band stop filter as claimed in claim 1, it is characterized in that the arrangement pitches of three described under shed ring structure pasters (4) is 0.5mm ~ 1.5mm, under shed ring structure paster (4) is made up of the first square openings ring paster (8), the second square openings ring paster (9), the 3rd square openings ring paster (10), wrist watch shape paster (11), wherein the total length of the first square openings ring paster (8) and overall width are 3.5mm ~ 4.5mm, and gap width is 0.1mm ~ 0.3mm; Total length and the overall width of the second square openings ring paster (9) are 3.1mm ~ 3.3mm, and gap width is 0.1mm ~ 0.3mm; Total length and the overall width of the 3rd square openings ring paster (10) are 2.3mm ~ 2.4mm, and gap width is 0.1mm ~ 0.3mm; Wrist watch shape paster (11) is made up of two little rectangular patches and a large square patch, and wherein the length of two little rectangular patches is 0.4mm ~ 0.6mm, and width is 0.1mm ~ 0.3mm, and the length of side of large square patch is 0.4mm ~ 0.6mm.

5. a kind of nested type openings ring band stop filter as claimed in claim 1, it is characterized in that the length of three described rectangular patches (5) is 0.1mm ~ 0.3mm, width is 0.9mm ~ 1.1mm.

6. a kind of nested type openings ring band stop filter as claimed in claim 1, it is characterized in that described U-shaped paster (6) is made up of two perpendicular rectangular patches and a horizontal rectangular patch, wherein the length of two perpendicular rectangular patches is 1.4mm ~ 1.6mm, width is 0.3mm ~ 0.5mm, the length of horizontal rectangular patch is 5.3mm ~ 5.5mm, and width is 0.5mm ~ 1.5mm.

7. a kind of nested type openings ring band stop filter as claimed in claim 1, it is characterized in that the length of described rectangular metal ground plate (7) is 17mm ~ 19mm, width is 8mm ~ 10mm.