WO2021114018A1 - 微带滤波器 - Google Patents

微带滤波器 Download PDF

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Publication number
WO2021114018A1
WO2021114018A1 PCT/CN2019/124002 CN2019124002W WO2021114018A1 WO 2021114018 A1 WO2021114018 A1 WO 2021114018A1 CN 2019124002 W CN2019124002 W CN 2019124002W WO 2021114018 A1 WO2021114018 A1 WO 2021114018A1
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WIPO (PCT)
Prior art keywords
transmission line
microstrip filter
substrate
resonant
unit
Prior art date
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Ceased
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PCT/CN2019/124002
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English (en)
French (fr)
Inventor
庄智强
王超
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AAC Technologies Holdings Shenzhen Co Ltd
AAC Technologies Pte Ltd
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AAC Acoustic Technologies Shenzhen Co Ltd
AAC Technologies Pte Ltd
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Application filed by AAC Acoustic Technologies Shenzhen Co Ltd, AAC Technologies Pte Ltd filed Critical AAC Acoustic Technologies Shenzhen Co Ltd
Priority to PCT/CN2019/124002 priority Critical patent/WO2021114018A1/zh
Publication of WO2021114018A1 publication Critical patent/WO2021114018A1/zh
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters

Definitions

  • the present invention relates to the field of communication technology, in particular to a microstrip filter.
  • Mobile terminals include antenna modules, resulting in more and more complex environments for microstrip filters, miniaturization, low profile, low loss, low tolerance, and broadband filtering.
  • the design of the device has become a challenge.
  • the microstrip filter is a low-profile filter structure.
  • the existing microstrip filter has disadvantages such as large loss in millimeter wave applications, and it is difficult to meet the needs of broadband operation on a low-thickness dielectric substrate.
  • the purpose of the present invention is to provide a microstrip filter with low loss and wide bandwidth.
  • the present invention provides a microstrip filter.
  • the microstrip filter includes a substrate, a transmission line arranged on the substrate, a grounding member, and at least two resonant units.
  • the transmission line is used for signal transmission, and the resonant units are parallel to each other. It is provided that one end of each resonant unit is electrically connected to the grounding member, and the other ends of every two adjacent resonant units are electrically connected through the transmission line.
  • the resonance unit is arranged perpendicular to the transmission line.
  • the length of the resonance unit is a quarter of the wavelength length of the signal transmitted by the transmission line.
  • the resonance units are arranged at intervals.
  • the resistance of the transmission line is 45-55 ⁇ .
  • the thickness of the substrate is less than 70 ⁇ m.
  • the distances between the resonant units are equal.
  • the resonant unit includes three.
  • the substrate includes a first surface and a second surface opposite to each other, the transmission line and the resonance unit are arranged on the first surface of the substrate, and the grounding member is arranged on the second surface of the substrate.
  • the substrate is provided with ground holes with the same number as the resonant unit
  • the microstrip filter further includes a ground post, the ground post is located in the ground hole, and each resonant unit passes through one ground
  • the column is electrically connected to the grounding member.
  • the microstrip filter of the present invention includes a substrate, a transmission line provided on the substrate, a grounding member, and at least two resonant units.
  • the transmission line is used to transmit signals, and the resonant unit Are arranged in parallel, one end of each resonant unit is electrically connected to the grounding member, and the other end of each two adjacent resonant units is electrically connected through the transmission line, the performance of the microstrip filter is good , Can be applied to thinner substrates, microstrip filter has small insertion loss, relatively wide bandwidth, and low tolerance, and has broad application prospects in millimeter wave communications.
  • FIG. 1 is a schematic diagram of a three-dimensional structure of a microstrip filter provided by an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of an exploded structure of a microstrip filter provided by an embodiment of the present invention.
  • Fig. 3 is a schematic diagram of an enlarged structure at A in Fig. 1.
  • FIG. 4 is a graph of S characteristic parameters of a microstrip filter provided by an embodiment of the present invention.
  • the present invention provides a microstrip filter 10.
  • the microstrip filter 10 includes a substrate 11, a transmission line 12 disposed on the substrate 11, a grounding member 13, and at least two resonance units 14.
  • the transmission line 12 is used to transmit signals.
  • the resonant units 14 are arranged in parallel, one end of each resonant unit 14 is electrically connected to the grounding member 13, and the other end of each two adjacent resonant units 14 passes through the transmission line 12 is electrically connected, and each of the resonant units 14 is electrically connected to the ground member 13.
  • the grounding member 13 is grounded.
  • the resonance unit 14 can filter the signal transmitted on the transmission line 12.
  • the substrate 11 may be a printed circuit board substrate 11 (Printed Circuit Board, PCB).
  • the microstrip filter 10 of the present invention can meet the bandwidth requirement even when the thickness of the substrate 11 is relatively thin. Specifically, the thickness of the substrate 11 is less than 70 ⁇ m, for example, the thickness of the substrate 11 may be 60 ⁇ m.
  • the substrate 11 includes a first surface and a second surface that are opposed to each other.
  • the transmission line 12, the grounding member 13, and at least two resonance units 14 are arranged on both surfaces of the substrate 11. Specifically, the transmission line 12 and the resonance unit 14 are arranged on the first surface of the substrate 11, and the grounding member 13 is arranged on the second surface of the substrate 11.
  • the substrate 11 is provided with ground holes 111 in the same number as the resonant unit 14.
  • the transmission line 12, the grounding member 13, and the at least two resonant units 14 may also be arranged on the same surface of the substrate 11, for example, they are all arranged on the first surface of the substrate 11. At this time, the substrate 11 may not have a ground hole 111. .
  • the transmission line 12 includes an input terminal 121 and an output terminal 122 opposite to each other.
  • the input terminal 121 is used for inputting a signal
  • the output terminal 122 is used for outputting a signal.
  • the transmission line 12 is linear.
  • the transmission line 12 may be a copper wire, and the transmission performance of the copper wire is better.
  • the resistance of the transmission line 12 is 45-55 ⁇ , preferably 50 ⁇ .
  • the length of the transmission line 12 is not limited. By changing the length of the transmission line 12, the coupling strength between the resonant units 14 can be adjusted.
  • the grounding member 13 is used for grounding.
  • the material of the grounding member 13 is preferably copper.
  • the shape of the grounding member 13 may be a sheet shape, that is, the grounding member 13 is a grounding sheet.
  • the resonant unit 14 is a wire capable of transmitting signals.
  • the resonant unit 14 is a short-circuit line, that is, the resonant unit 14 is grounded through the grounding member 13.
  • Each resonant unit 14 is substantially perpendicular to the transmission line 12.
  • the included angle b between the resonant unit 14 and the transmission line 12 is 85° to 95°.
  • the resonant unit 14 is perpendicular to the transmission line 12.
  • the resonance units 14 are arranged at intervals. When the number of resonance units 14 is greater than two, the distance L1 between the resonance units 14 is equal.
  • the distance L1 between two adjacent resonant units 14 is not limited, that is, the length of the transmission line 12 between two adjacent resonant units 14 is not limited, and the coupling strength between two adjacent resonant units 14 can be controlled by The length of the connected transmission line 12 can be adjusted.
  • the length L2 of the resonance unit 14 is a quarter of the wavelength length of the signal transmitted by the transmission line 12.
  • the microstrip filter 10 may also include grounding posts (not shown) in the same number as the resonant unit 14, each grounding post is located in a grounding hole 111, the grounding post can conduct electricity, and each resonating unit 14 passes through a grounding post. It is electrically connected to the grounding member 13.
  • the number of resonant units 14 is at least two. In the present invention, three resonant units 14 are taken as an example for description.
  • the resonance unit 14 specifically includes a first resonance unit 141, a second resonance unit 142 and a third resonance unit 143.
  • the first resonance unit 141 is perpendicular to the transmission line 12.
  • the length of the first resonance unit 141 is a quarter of the wavelength length of the signal transmitted by the transmission line 12.
  • the first resonance unit 141 includes opposite first and second ends.
  • the first end of the first resonant unit 141 is electrically connected to the transmission line 12, and the second end of the second resonant unit 142 is electrically connected to the grounding member 13.
  • the second end of the second resonance unit 142 is electrically connected to the grounding member 13 through a grounding pole.
  • the second resonance unit 142 is perpendicular to the transmission line 12.
  • the length of the second resonance unit 142 is a quarter of the wavelength length of the signal transmitted by the transmission line 12.
  • the second resonance unit 142 includes opposite third and fourth ends.
  • the third end of the second resonant unit 142 is electrically connected to the transmission line 12, and the fourth end of the second resonant unit 142 is electrically connected to the grounding member 13.
  • the fourth end of the second resonance unit 142 is electrically connected to the grounding member 13 through a grounding pole.
  • the third resonance unit 143 is perpendicular to the transmission line 12.
  • the length of the third resonance unit 143 is a quarter of the wavelength length of the signal transmitted by the transmission line 12.
  • the third resonance unit 143 includes opposite fifth and sixth ends.
  • the fifth end of the third resonance unit 143 is electrically connected to the transmission line 12, and the sixth end of the third resonance unit 143 is electrically connected to the grounding member 13.
  • the sixth end of the third resonance unit 143 is electrically connected to the grounding member 13 through a grounding pole.
  • the distance between the first resonance unit 141 and the second resonance unit 142 is equal to the distance between the second resonance unit 142 and the third resonance unit 143.
  • S11 is the port reflection coefficient of the microstrip filter 10 of the present invention
  • S21 is the transmission coefficient.
  • the microstrip filter 10 of the present invention has good performance when the substrate is thin. For example, when the thickness of the substrate 11 is 60 ⁇ m, the center frequency of the microstrip filter 10 is 30.5GHz, the relative bandwidth is 45.9%, and the insertion loss is less than 0.6dB, which meets the requirements of the 5G millimeter wave communication system. Broad application prospects.
  • the microstrip filter of the present invention includes a substrate, a transmission line provided on the substrate, a grounding member, and at least two resonant units.
  • the transmission line is used to transmit signals, and the resonant unit Are arranged in parallel, one end of each resonant unit is electrically connected to the grounding member, and the other end of each two adjacent resonant units is electrically connected through the transmission line, the performance of the microstrip filter is good , Can be applied to thinner substrates, microstrip filter has small insertion loss, relatively wide bandwidth, and low tolerance, and has broad application prospects in millimeter wave communications.

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  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

本发明涉及通讯技术领域，尤其涉及一种微带滤波器。微带滤波器包括基板和设置在基板上的传输线、接地件、至少两个谐振单元，所述传输线用于传输信号，所述谐振单元之间平行设置，每个所述谐振单元的一端和所述接地件电性连接，每相邻的两个所述谐振单元的另一端通过所述传输线电性连接。本发明的微带滤波器具有损耗小、带宽较宽的优点。

Description

微带滤波器 技术领域
本发明涉及通讯技术领域，尤其涉及一种微带滤波器。
 背景技术
随着社会不断发展，移动终端的功能不断增加，移动终端中包括天线模组，造成了微带滤波器的环境越来越复杂，小型化、低剖面、低损耗、低公差、宽带化的滤波器的设计已然成为一种挑战。
微带滤波器是一种低剖面的滤波器结构，现有的微带滤波器在毫米波的应用中具有损耗大等缺点，并且在较低厚度的介质基板上难以满足宽带工作的需求。
因此，有必要提供一种损耗小、带宽较宽微带滤波器的以解决上述问题。
 技术问题
本发明的目的在于提供一种损耗小、带宽较宽微带滤波器。
 技术解决方案
本发明的技术方案如下：
本发明提供一种微带滤波器，所述微带滤波器包括基板和设置在基板上的传输线、接地件、至少两个谐振单元，所述传输线用于传输信号，所述谐振单元之间平行设置，每个所述谐振单元的一端和所述接地件电性连接，每相邻的两个所述谐振单元的另一端通过所述传输线电性连接。
优选地，所述谐振单元相对所述传输线垂直设置。
优选地，所述谐振单元的长度为所述传输线传输信号的波长长度的四分之一。
优选地，所述谐振单元之间间隔设置。
优选地，所述传输线的电阻为45~55Ω。
优选地，所述基板的厚度小于70μm。
优选地，所述谐振单元的数量大于两个时，所述谐振单元之间的距离相等。
优选地，所述谐振单元包括三个。
优选地，所述基板包括相对的第一表面和第二表面，所述传输线和所述谐振单元设置在所述基板的第一表面，所述接地件设置在所述基板的第二表面。
优选地，所述基板上开设和所述谐振单元数量一致的接地孔，微带滤波器还包括接地柱，所述接地柱位于所述接地孔内，每个所述谐振单元通过一个所述接地柱和所述接地件电性连接。
 有益效果
本发明实施方式相对于现有技术而言，本发明的微带滤波器包括基板和设置在基板上的传输线、接地件、至少两个谐振单元，所述传输线用于传输信号，所述谐振单元之间平行设置，每个所述谐振单元的一端和所述接地件电性连接，每相邻的两个所述谐振单元的另一端通过所述传输线电性连接，微带滤波器的性能好，能适用于厚度较薄的基板，微带滤波器的插入损耗小，相对带宽很宽，公差低，在毫米波通信中具有广阔的应用前景。
 附图说明
图1为本发明实施例提供的微带滤波器的立体结构示意图。
图2为本发明实施例提供的微带滤波器的爆炸结构示意图。
图3为图1中A处的放大结构示意图。
图4为本发明实施例提供的微带滤波器的S特性参数曲线图。
 本发明的实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产 品或设备固有的其它步骤或单元。
需要说明的是，在本发明中涉及“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本发明要求的保护范围之内。
请一并参照图1和图2，本发明提供一种微带滤波器10，微带滤波器10包括基板11和设置在基板11上的传输线12、接地件13、至少两个谐振单元14。传输线12用于传输信号，所述谐振单元14之间平行设置，每个谐振单元14的一端和接地件13电性连接，每相邻的两个所述谐振单元14的另一端通过所述传输线12电性连接，每个所述谐振单元14都和所述接地件13电性连接。接地件13是接地的，在传输线12上传输信号时，谐振单元14能对传输线12上传输的信号滤波。
基板11可以为印刷电路板基板11(Printed Circuit Board，PCB)。本发明的微带滤波器10能在基板11的厚度较薄时也能满足带宽需求。具体的，基板11的厚度小于70μm，如基板11的厚度可以为60μm。基板11包括相对设置的第一表面和第二表面。传输线12、接地件13、至少两个谐振单元14设置在基板11的两个表面上。具体的，传输线12、谐振单元14设置在基板11的第一表面，接地件13设置在基板11的第二表面。基板11上开设和谐振单元14数量一致的接地孔111。可以理解，传输线12、接地件13、至少两个谐振单元14也可以设置在基板11的同一个表面上，如都设置在基板11的第一表面，此时基板11上可以不开设接地孔111。
请参阅图3，传输线12包括相对的输入端121和输出端122。输入端121用于输入信号，输出端122用于输出信号。优选地，传输线12呈直线状。传输线12可以为铜线，铜线的传输性能较好。传输线12的电阻为45~55Ω，优选为50Ω。传输线12的长度不做限定，改变传输线12的长度，可以对谐振单元14之间的耦合强度进行调整。
接地件13用于接地。接地件13的材质优选为铜。接地件13的形状可以为片状，即接地件13为一个接地片。
谐振单元14为一能传输信号的线材，具体的，谐振单元14为短路线，即谐振单元14通过接地件13接地。每个谐振单元14都相对传输线12大致垂直，具体的，谐振单元14和传输线12之间的夹角b为85°~95°，优选谐振单元14都相对传输线12垂直。谐振单元14之间间隔设置。在谐振单元14的数量大于两个时，谐振单元14之间的距离L1相等。两相邻谐振单元14之间的距离L1不做限定，即两相邻谐振单元14之间传输线12的长度不做限定，两相邻的两个谐振单元14之间的耦合强度可通过控制其间连接的传输线12长度来调整。谐振单元14的长度L2为传输线12传输信号的波长长度的四分之一。谐振单元14和传输线12电性连接时，谐振单元14的端部和传输线12电性连接。微带滤波器10还可以包括和谐振单元14数量一致的接地柱（图未示），每个接地柱分别位于一个接地孔111内，接地柱能导电，每个谐振单元14分别通过一个接地柱和接地件13电性连接。
谐振单元14的数量为至少两个，本发明中，以三个谐振单元14为例进行说明。谐振单元14具体包括第一谐振单元141、第二谐振单元142和第三谐振单元143。
第一谐振单元141相对传输线12垂直。第一谐振单元141的长度为传输线12传输信号的波长长度的四分之一。第一谐振单元141包括相对的第一端和第二端。第一谐振单元141的第一端和传输线12电性连接，第二谐振单元142的第二端和接地件13电性连接。具体的，第二谐振单元142的第二端通过一个接地柱和接地件13电性连接。
第二谐振单元142相对传输线12垂直。第二谐振单元142的长度为传输线12传输信号的波长长度的四分之一。第二谐振单元142包括相对的第三端和第四端。第二谐振单元142的第三端和传输线12电性连接，第二谐振单元142的第四端和接地件13电性连接。具体的，第二谐振单元142的第四端通过一个接地柱和接地件13电性连接。
第三谐振单元143相对传输线12垂直。第三谐振单元143的长度为传输线12传输信号的波长长度的四分之一。第三谐振单元143包括相对的第五端和第六端。第三谐振单元143的第五端和传输线12电性连接，第三谐振单元143的第六端和接地件13电性连接。具体的，第三谐振单元143的第六端通过一个接地柱和接地件13电性连接。第一谐振单元141和第二谐振单元142的距离，等于第二谐振单元142和第三谐振单元143的距离。
请结合图4所示，S11为本发明的微带滤波器10的端口反射系数，S21为传输系数，本发明的微带滤波器10，在基板较薄时，微带滤波器10的性能好，如在基板11的厚度为60μm时，微带滤波器10的中心频率为30.5GHz，相对带宽为45.9%，插入损耗小于0.6dB，符合5G毫米波通信系统的要求，在毫米波通信中具有广阔的应用前景。
本发明实施方式相对于现有技术而言，本发明的微带滤波器包括基板和设置在基板上的传输线、接地件、至少两个谐振单元，所述传输线用于传输信号，所述谐振单元之间平行设置，每个所述谐振单元的一端和所述接地件电性连接，每相邻的两个所述谐振单元的另一端通过所述传输线电性连接，微带滤波器的性能好，能适用于厚度较薄的基板，微带滤波器的插入损耗小，相对带宽很宽，公差低，在毫米波通信中具有广阔的应用前景。
以上所述的仅是本发明的实施方式，在此应当指出，对于本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出改进，但这些均属于本发明的保护范围。

Claims (10)

  1. 一种微带滤波器，其特征在于：所述微带滤波器包括基板和设置在基板上的传输线、接地件、至少两个谐振单元，所述传输线用于传输信号，所述谐振单元之间平行设置，每个所述谐振单元的一端和所述接地件电性连接，每相邻的两个所述谐振单元的另一端通过所述传输线电性连接。
  2. 根据权利要求1所述的微带滤波器，其特征在于：所述谐振单元相对所述传输线垂直设置。
  3. 根据权利要求1所述的微带滤波器，其特征在于：所述谐振单元的长度为所述传输线传输信号的波长长度的四分之一。
  4. 根据权利要求1所述的微带滤波器，其特征在于：所述谐振单元之间间隔设置。
  5. 根据权利要求1所述的微带滤波器，其特征在于：所述传输线的电阻为45~55Ω。
  6. 根据权利要求1所述的微带滤波器，其特征在于：所述基板的厚度小于70μm。
  7. 根据权利要求1所述的微带滤波器，其特征在于：所述谐振单元的数量大于两个时，所述谐振单元之间的距离相等。
  8. 根据权利要求7所述的微带滤波器，其特征在于：所述谐振单元包括三个。
  9. 根据权利要求1所述的微带滤波器，其特征在于：所述基板包括相对的第一表面和第二表面，所述传输线和所述谐振单元设置在所述基板的第一表面，所述接地件设置在所述基板的第二表面。
  10. 根据权利要求9所述的微带滤波器，其特征在于：所述基板上开设和所述谐振单元数量一致的接地孔，微带滤波器还包括接地柱，所述接地柱位于所述接地孔内，每个所述谐振单元通过一个所述接地柱和所述接地件电性连接。
PCT/CN2019/124002 2019-12-09 2019-12-09 微带滤波器 Ceased WO2021114018A1 (zh)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102055050A (zh) * 2009-10-29 2011-05-11 鸿富锦精密工业（深圳）有限公司 带通滤波器
US20160181678A1 (en) * 2013-07-04 2016-06-23 Thomson Licensing Band-rejection filter
CN110048198A (zh) * 2018-01-16 2019-07-23 南京航空航天大学 基于表面等离子激元传输线的滤波器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102055050A (zh) * 2009-10-29 2011-05-11 鸿富锦精密工业（深圳）有限公司 带通滤波器
US20160181678A1 (en) * 2013-07-04 2016-06-23 Thomson Licensing Band-rejection filter
CN110048198A (zh) * 2018-01-16 2019-07-23 南京航空航天大学 基于表面等离子激元传输线的滤波器

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