CN104282969A - Band stop microstrip line filter - Google Patents

Band stop microstrip line filter Download PDF

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CN104282969A
CN104282969A CN201410599269.6A CN201410599269A CN104282969A CN 104282969 A CN104282969 A CN 104282969A CN 201410599269 A CN201410599269 A CN 201410599269A CN 104282969 A CN104282969 A CN 104282969A
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transmission line
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李九生
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China Jiliang University
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Abstract

本发明公开了一种带阻微带线滤波器。它包括基板、输入传输线、锯齿形传输线、输出传输线、四分之一椭圆形接地板、方形内接对称T形耦合线;基板正面中心横向设有锯齿形传输线,基板正面四角设有四分之一椭圆形接地板,锯齿形传输线一端与输入传输线一端相连,输入传输线另一端与基板左端相连,锯齿形传输线另一端与输出传输线一端相连,输出传输线另一端与基板右端相连;基板背面设有由2×9个方形内接对称T形耦合线单元组成的内接对称T形耦合线,方形内接对称T形单元包括一个方形环和两个T形耦合线。本发明具有滤波性能好,插入损耗低,结构简单,尺寸小,制作方便,便于集成等优点。

The invention discloses a band-stop microstrip line filter. It includes a substrate, an input transmission line, a zigzag transmission line, an output transmission line, a quarter oval ground plate, and a symmetrical T-shaped coupling line connected in a square; An oval ground plate, one end of the zigzag transmission line is connected to one end of the input transmission line, the other end of the input transmission line is connected to the left end of the substrate, the other end of the zigzag transmission line is connected to one end of the output transmission line, and the other end of the output transmission line is connected to the right end of the substrate; An inscribed symmetrical T-shaped coupling line composed of 2×9 square inscribed symmetrical T-shaped coupling line units. The square inscribed symmetrical T-shaped unit includes a square ring and two T-shaped coupling lines. The invention has the advantages of good filtering performance, low insertion loss, simple structure, small size, convenient manufacture and integration.

Description

带阻微带线滤波器Band stop microstrip line filter

技术领域 technical field

本发明涉及微波滤波器,尤其涉及一种带阻微带线滤波器。 The invention relates to a microwave filter, in particular to a band-stop microstrip line filter.

背景技术 Background technique

随着雷达技术和无线通信等无线电技术的飞速发展,微波射频电路与系统越来越受到广泛的重视。微波滤波器是其中的重要组成部分之一,其性能的优劣很大程度决定了系统的工作质量。各种功能的系统相继开发,使得微波频谱资源日趋紧张,频率间隔不断缩小,这就对滤波器提出了更高的要求。其中微带滤波器以其具有较高性能、尺寸小、设计周期短、易于集成、用光刻技术易于加工等优点得到广泛的应用。近年来,高性能基板材料的研发使微带滤波器可以应用在很大的频率范围,从而使微带滤波器成为最常用的滤波器类型。 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.

低通滤波器和带阻滤波器是滤波器的重要组成之一,其用在发射端前级或接收端的后级,用于滤除不需要的高频段信号。近年来也有很多文献对宽阻带带阻滤波器进行了研究,宽阻带带阻滤波器在具有带内损耗低、波动小、反射系数小等优点的情况下,还有很宽的阻带,能有效抑制高频杂散信号,是当今滤波器发展的一个重要方向。 Low-pass filter and band-stop filter are one of the important components of the filter, which are used in the front stage of the transmitter or the rear stage of the receiver to filter out unwanted high-frequency signals. In recent years, there are also many literatures on the wide stopband bandstop filter. The wide stopband bandstop 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.

发明内容 Contents of the invention

本发明提供一种带阻微带线滤波器,技术方案如下: The invention provides a band-stop microstrip line filter, and the technical scheme is as follows:

带阻微带线滤波器包括基板、输入传输线、锯齿形传输线、输出传输线、四分之一椭圆形接地板、方形内接对称T形耦合线;基板正面中心横向设有锯齿形传输线,基板正面四角设有四分之一椭圆形接地板,锯齿形传输线一端与输入传输线一端相连,输入传输线另一端与基板左端相连,锯齿形传输线另一端与输出传输线一端相连,输出传输线另一端与基板右端相连;基板背面设有由2×9个方形内接对称T形耦合线单元组成的内接对称T形耦合线,方形内接对称T形单元包括一个方形环和两个T形耦合线。 The band-stop microstrip line filter includes a substrate, an input transmission line, a zigzag transmission line, an output transmission line, a quarter oval ground plane, and a symmetrical T-shaped coupling line inscribed in a square; a zigzag transmission line is arranged horizontally in the center of the front of the substrate, and There is a quarter oval ground plate at the four corners, one end of the zigzag transmission line is connected to one end of the input transmission line, the other end of the input transmission line is connected to the left end of the substrate, the other end of the zigzag transmission line is connected to one end of the output transmission line, and the other end of the output transmission line is connected to the right end of the substrate ; The back of the substrate is provided with an inscribed symmetrical T-shaped coupling line consisting of 2×9 square inscribed symmetrical T-shaped coupling line units. The square inscribed symmetrical T-shaped unit includes a square ring and two T-shaped coupling lines.

所述的基板为玻璃纤维环氧树脂材料,基板的长度为150mm~170mm,宽度为35mm~45mm。所述的输入传输线和输出传输线的形状大小相同,长度均为8mm~12mm,宽度均为2mm~4mm。所述的锯齿形传输线由18个纵向微带线和17个横向微带线交替连接而成,横向微带线的长度均为3.5mm~4.5mm,宽度均为2.5mm~3.5mm,纵向微带线呈左右对称,宽度均为3.5mm~4.5mm,长度为4mm~12mm。所述的四分之一椭圆形接地板为一个四分之一椭圆,其长半径均为45mm~55mm,短半径均为17mm~19mm。所述的方形内接对称T形耦合线位于基板背面的中心,总长度为60mm~80mm,总宽度为15mm~20mm。所述的左右两个相邻的方形内接对称T形单元间距为1.5mm~2.5mm,上下两个相邻的方形内接对称T形单元间距为4mm~6mm。所述的方形环的总长度为5mm~7mm,总宽度为5mm~7mm,环的宽度为0.4mm~0.8mm。所述的T形耦合线总长度为3mm~5mm,总宽度为2mm~2.5mm,线宽为0.4mm~0.8mm。 The substrate is made of glass fiber epoxy resin material, the length of the substrate is 150mm-170mm, and the width is 35mm-45mm. The shape and size of the input transmission line and the output transmission line are the same, the length is 8mm-12mm, and the width is 2mm-4mm. The zigzag transmission line is formed by alternately connecting 18 longitudinal microstrip lines and 17 transverse microstrip lines. The strip lines are left-right symmetrical, with a width of 3.5mm-4.5mm and a length of 4mm-12mm. The quarter ellipse grounding plate is a quarter ellipse with a long radius of 45mm-55mm and a short radius of 17mm-19mm. The square inscribed symmetrical T-shaped coupling line is located at the center of the back of the substrate, with a total length of 60 mm to 80 mm and a total width of 15 mm to 20 mm. The distance between the two adjacent left and right square inscribed symmetrical T-shaped units is 1.5mm-2.5mm, and the distance between the upper and lower adjacent square inscribed symmetrical T-shaped units is 4mm-6mm. The total length of the square ring is 5mm-7mm, the total width is 5mm-7mm, and the ring width is 0.4mm-0.8mm. The total length of the T-shaped coupling line is 3 mm to 5 mm, the total width is 2 mm to 2.5 mm, and the line width is 0.4 mm to 0.8 mm.

本发明具有滤波性能好,结构简单,尺寸小,制作方便,便于集成等优点。 The invention has the advantages of good filtering performance, simple structure, small size, convenient manufacture and integration.

附图说明 Description of drawings

图1是带阻微带线滤波器的正面结构图; Figure 1 is a frontal structural diagram of a bandstop microstrip line filter;

图2是带阻微带线滤波器的背面结构图; Fig. 2 is the back structure diagram of the band-stop microstrip line filter;

图3是方形内接对称T形单元的结构图; Fig. 3 is a structural diagram of a symmetrical T-shaped unit inscribed in a square;

图4是带阻微带线滤波器的性能曲线图; Fig. 4 is the performance curve diagram of band stop microstrip line filter;

图5是带阻微带线滤波器在5.1GHz时的表面电流分布图; Figure 5 is a surface current distribution diagram of the band-stop microstrip line filter at 5.1 GHz;

图6是带阻微带线滤波器在5.4GHz时的表面电流分布图; Fig. 6 is a surface current distribution diagram of the band-stop microstrip line filter at 5.4 GHz;

图7是带阻微带线滤波器在5.78GHz时的表面电流分布图。 Fig. 7 is a surface current distribution diagram of the band-stop microstrip line filter at 5.78 GHz.

具体实施方式 Detailed ways

如图1~3所示,带阻微带线滤波器包括基板1、输入传输线2、锯齿形传输线3、输出传输线4、四分之一椭圆形接地板5、方形内接对称T形耦合线6;基板1正面中心横向设有锯齿形传输线3,基板1正面四角设有四分之一椭圆形接地板5,锯齿形传输线3一端与输入传输线2一端相连,输入传输线2另一端与基板1左端相连,锯齿形传输线3另一端与输出传输线4一端相连,输出传输线4另一端与基板1右端相连;基板1背面设有由2×9个方形内接对称T形耦合线单元6组成的内接对称T形耦合线7,方形内接对称T形单元6包括一个方形环8和两个T形耦合线9。 As shown in Figures 1 to 3, the bandstop microstrip line filter includes a substrate 1, an input transmission line 2, a zigzag transmission line 3, an output transmission line 4, a quarter elliptical ground plate 5, and a symmetrical T-shaped coupling line connected in a square 6. There is a zigzag transmission line 3 in the center of the front of the substrate 1, and a quarter oval ground plate 5 is provided at the four corners of the front of the substrate 1. One end of the zigzag transmission line 3 is connected to one end of the input transmission line 2, and the other end of the input transmission line 2 is connected to the substrate 1. The left end is connected, the other end of the zigzag transmission line 3 is connected to one end of the output transmission line 4, and the other end of the output transmission line 4 is connected to the right end of the substrate 1; Connected to the symmetrical T-shaped coupling line 7 , the square inscribed symmetrical T-shaped unit 6 includes a square ring 8 and two T-shaped coupling lines 9 .

所述的基板1为玻璃纤维环氧树脂材料,基板1的长度为150mm~170mm,宽度为35mm~45mm。所述的输入传输线2和输出传输线4的形状大小相同,长度均为8mm~12mm,宽度均为2mm~4mm。所述的锯齿形传输线3由18个纵向微带线和17个横向微带线交替连接而成,横向微带线的长度均为3.5mm~4.5mm,宽度均为2.5mm~3.5mm,纵向微带线呈左右对称,宽度均为3.5mm~4.5mm,长度为4mm~12mm。所述的四分之一椭圆形接地板5为一个四分之一椭圆,其长半径均为45mm~55mm,短半径均为17mm~19mm。所述的方形内接对称T形耦合线6位于基板1背面的中心,总长度为60mm~80mm,总宽度为15mm~20mm。所述的左右两个相邻的方形内接对称T形单元7间距为1.5mm~2.5mm,上下两个相邻的方形内接对称T形单元7间距为4mm~6mm。所述的方形环8的总长度为5mm~7mm,总宽度为5mm~7mm,环的宽度为0.4mm~0.8mm。所述的T形耦合线9总长度为3mm~5mm,总宽度为2mm~2.5mm,线宽为0.4mm~0.8mm。 The substrate 1 is made of glass fiber epoxy resin material, the length of the substrate 1 is 150mm-170mm, and the width is 35mm-45mm. The shape and size of the input transmission line 2 and the output transmission line 4 are the same, the length is 8mm-12mm, and the width is 2mm-4mm. The zigzag transmission line 3 is formed by alternately connecting 18 longitudinal microstrip lines and 17 transverse microstrip lines. The microstrip line is left-right symmetrical, with a width of 3.5 mm to 4.5 mm and a length of 4 mm to 12 mm. The quarter ellipse grounding plate 5 is a quarter ellipse with a long radius of 45mm-55mm and a short radius of 17mm-19mm. The square inscribed symmetrical T-shaped coupling line 6 is located at the center of the back of the substrate 1, with a total length of 60mm-80mm and a total width of 15mm-20mm. The distance between the two adjacent left and right square inscribed symmetrical T-shaped units 7 is 1.5mm-2.5mm, and the distance between the upper and lower two adjacent square inscribed symmetrical T-shaped units 7 is 4mm-6mm. The total length of the square ring 8 is 5mm-7mm, the total width is 5mm-7mm, and the ring width is 0.4mm-0.8mm. The T-shaped coupling line 9 has a total length of 3 mm to 5 mm, a total width of 2 mm to 2.5 mm, and a line width of 0.4 mm to 0.8 mm.

实施例1Example 1

带阻微带线滤波器: Band stop microstrip line filter:

选择介电常数为4.4的玻璃纤维环氧树脂材料制作微带基板,厚度为0.5mm。基板的长度为160mm,宽度为40mm。输入传输线和输出传输线的形状大小相同,长度均为10mm,宽度均为3mm。锯齿形传输线由18个纵向微带线和17个横向微带线交替连接而成,横向微带线的长度均为4mm,宽度均为3mm,纵向微带线呈左右对称,宽度均为4mm,长度为由两端到中间依次为4mm、5mm、6mm、7mm、8mm、9mm、10mm、11mm、12mm。四分之一椭圆形接地板为一个四分之一椭圆,其长半径均为50mm,短半径均为18mm。方形内接对称T形耦合线位于基板背面的中心,总长度为70mm,总宽度为19mm。左右两个相邻的方形内接对称T形单元间距为2mm,上下两个相邻的方形内接对称T形单元间距为5mm。方形环的总长度为6mm,总宽度为6mm,环的宽度为0.6mm。T形耦合线总长度为4mm,总宽度为2.2mm,线宽为0.6mm。带阻微带线滤波器的各项性能指标采用CST软件进行测试,所得滤波器的性能曲线如附图4所示。由图可见,3dB通带范围为0GHz~5.1GHz和5.78GHz~7.0GHz,3dB阻带范围为5.1GHz~5.78GHz,插入损耗最大值为-44dB。在这些通带范围内插入损耗小,回波损耗大,在阻带范围内插入损耗大,回波损耗小,这说明滤波器具有优良的带阻滤波性能。图5、图6和图7为带阻微带线滤波器分别在5.1GHz、5.4GHz和5.78GHz时的表面电流分布图。 A glass fiber epoxy resin material with a dielectric constant of 4.4 is selected to make a microstrip substrate with a thickness of 0.5 mm. The substrate has a length of 160 mm and a width of 40 mm. The shape and size of the input transmission line and the output transmission line are the same, the length is 10mm, and the width is 3mm. The zigzag transmission line is formed by alternately connecting 18 vertical microstrip lines and 17 transverse microstrip lines. The length of the transverse microstrip lines is 4mm and the width is 3mm. The longitudinal microstrip lines are left-right symmetrical and the width is 4mm. The length is 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm from both ends to the middle. The quarter ellipse grounding plate is a quarter ellipse with a long radius of 50mm and a short radius of 18mm. A square inscribed symmetrical T-shaped coupling line is located at the center of the backside of the substrate, with a total length of 70mm and a total width of 19mm. The distance between two adjacent square inscribed symmetrical T-shaped units on the left and right is 2 mm, and the distance between two adjacent square inscribed symmetrical T-shaped units on the upper and lower sides is 5 mm. The overall length of the square ring is 6mm, the overall width is 6mm, and the width of the ring is 0.6mm. The total length of the T-shaped coupling line is 4mm, the total width is 2.2mm, and the line width is 0.6mm. Various performance indicators of the band-stop microstrip line filter are tested with CST software, and the performance curve of the obtained filter is shown in Figure 4. It can be seen from the figure that the 3dB passband ranges from 0GHz to 5.1GHz and 5.78GHz to 7.0GHz, the 3dB stopband ranges from 5.1GHz to 5.78GHz, and the maximum insertion loss is -44dB. The insertion loss is small and the return loss is large in these passband ranges, and the insertion loss is large and the return loss is small in the stopband range, which shows that the filter has excellent band-stop filtering performance. Figure 5, Figure 6 and Figure 7 are the surface current distribution diagrams of the band-stop microstrip line filter at 5.1GHz, 5.4GHz and 5.78GHz respectively.

Claims (9)

1.一种带阻微带线滤波器,其特征在于包括基板(1)、输入传输线(2)、锯齿形传输线(3)、输出传输线(4)、四分之一椭圆形接地板(5)、方形内接对称T形耦合线(6);基板(1)正面中心横向设有锯齿形传输线(3),基板(1)正面四角设有四分之一椭圆形接地板(5),锯齿形传输线(3)一端与输入传输线(2)一端相连,输入传输线(2)另一端与基板(1)左端相连,锯齿形传输线(3)另一端与输出传输线(4)一端相连,输出传输线(4)另一端与基板(1)右端相连;基板(1)背面设有由2×9个方形内接对称T形耦合线单元(6)组成的内接对称T形耦合线(7),方形内接对称T形单元(6)包括一个方形环(8)和两个T形耦合线(9)。 1. A bandstop microstrip line filter, characterized in that it comprises a substrate (1), an input transmission line (2), a zigzag transmission line (3), an output transmission line (4), a quarter oval ground plate (5 ), a symmetrical T-shaped coupling line (6) inscribed in a square; a zigzag transmission line (3) is arranged horizontally in the center of the front of the substrate (1), and a quarter oval grounding plate (5) is arranged at the four corners of the front of the substrate (1), One end of the zigzag transmission line (3) is connected to one end of the input transmission line (2), the other end of the input transmission line (2) is connected to the left end of the substrate (1), the other end of the zigzag transmission line (3) is connected to one end of the output transmission line (4), and the output transmission line (4) The other end is connected to the right end of the substrate (1); the back of the substrate (1) is provided with an inscribed symmetrical T-shaped coupling line (7) composed of 2×9 square inscribed symmetrical T-shaped coupling line units (6), The square inscribed symmetrical T-shaped unit (6) includes a square ring (8) and two T-shaped coupling lines (9). 2.如权利要求1所述的一种带阻微带线滤波器,其特征在于所述的基板(1)为玻璃纤维环氧树脂材料,基板(1)的长度为150mm~170mm,宽度为35mm~45mm。 2. A bandstop microstrip line filter as claimed in claim 1, characterized in that the substrate (1) is made of glass fiber epoxy resin material, the length of the substrate (1) is 150 mm to 170 mm, and the width is 35mm ~ 45mm. 3.如权利要求1所述的一种带阻微带线滤波器,其特征在于所述的输入传输线(2)和输出传输线(4)的形状大小相同,长度均为8mm~12mm,宽度均为2mm~4mm。 3. A bandstop microstrip line filter as claimed in claim 1, characterized in that the shape and size of the input transmission line (2) and the output transmission line (4) are the same, the length is 8mm to 12mm, and the width is the same. It is 2mm ~ 4mm. 4.如权利要求1所述的一种带阻微带线滤波器,其特征在于所述的锯齿形传输线(3)由18个纵向微带线和17个横向微带线交替连接而成,横向微带线的长度均为3.5mm~4.5mm,宽度均为2.5mm~3.5mm,纵向微带线呈左右对称,宽度均为3.5mm~4.5mm,长度为4mm~12mm。 4. A bandstop microstrip line filter as claimed in claim 1, characterized in that the zigzag transmission line (3) is formed by alternately connecting 18 longitudinal microstrip lines and 17 transverse microstrip lines, The length of the transverse microstrip line is 3.5 mm to 4.5 mm, and the width is 2.5 mm to 3.5 mm. The longitudinal microstrip line is left-right symmetrical, with a width of 3.5 mm to 4.5 mm and a length of 4 mm to 12 mm. 5.如权利要求1所述的一种带阻微带线滤波器,其特征在于所述的四分之一椭圆形接地板(5)为一个四分之一椭圆,其长半径均为45mm~55mm,短半径均为17mm~19mm。 5. A bandstop microstrip line filter as claimed in claim 1, characterized in that the quarter ellipse ground plate (5) is a quarter ellipse with a long radius of 45mm ~55mm, and the short radius is 17mm~19mm. 6.如权利要求1所述的一种带阻微带线滤波器,其特征在于所述的方形内接对称T形耦合线(7)位于基板(1)背面的中心,总长度为60mm~80mm,总宽度为15mm~20mm。 6. A bandstop microstrip line filter as claimed in claim 1, characterized in that the square inscribed symmetrical T-shaped coupling line (7) is located at the center of the back of the substrate (1), with a total length of 60 mm to 80mm, the total width is 15mm ~ 20mm. 7.如权利要求1所述的一种带阻微带线滤波器,其特征在于所述的左右两个相邻的方形内接对称T形单元(6)间距为1.5mm~2.5mm,上下两个相邻的方形内接对称T形单元(6)间距为4mm~6mm。 7. A bandstop microstrip line filter as claimed in claim 1, characterized in that the distance between the left and right two adjacent square inscribed symmetrical T-shaped units (6) is 1.5mm-2.5mm, and the upper and lower The distance between two adjacent square inscribed symmetrical T-shaped units (6) is 4 mm to 6 mm. 8.如权利要求1所述的一种带阻微带线滤波器,其特征在于所述的方形环(8)的总长度为5mm~7mm,总宽度为5mm~7mm,环的宽度为0.4mm~0.8mm。 8. A bandstop microstrip line filter as claimed in claim 1, characterized in that the total length of the square ring (8) is 5 mm to 7 mm, the total width is 5 mm to 7 mm, and the ring width is 0.4 mm ~ 0.8mm. 9.如权利要求1所述的一种带阻微带线滤波器,其特征在于所述的T形耦合线(9)总长度为3mm~5mm,总宽度为2mm~2.5mm,线宽为0.4mm~0.8mm。 9. A bandstop microstrip line filter as claimed in claim 1, characterized in that the total length of the T-shaped coupling line (9) is 3 mm to 5 mm, the total width is 2 mm to 2.5 mm, and the line width is 0.4mm~0.8mm.
CN201410599269.6A 2014-10-31 2014-10-31 Band stop microstrip line filter Pending CN104282969A (en)

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