WO2019228102A1 - 一种小型化滤波器 - Google Patents

一种小型化滤波器 Download PDF

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Publication number
WO2019228102A1
WO2019228102A1 PCT/CN2019/083931 CN2019083931W WO2019228102A1 WO 2019228102 A1 WO2019228102 A1 WO 2019228102A1 CN 2019083931 W CN2019083931 W CN 2019083931W WO 2019228102 A1 WO2019228102 A1 WO 2019228102A1
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WIPO (PCT)
Prior art keywords
resonance
resonant
coupling
arm
structures
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PCT/CN2019/083931
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English (en)
French (fr)
Inventor
李敦穁
尹泽
谢瑞华
杨岳
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罗森伯格技术（昆山）有限公司
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Publication of WO2019228102A1 publication Critical patent/WO2019228102A1/zh

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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
    • H01P1/207—Hollow waveguide 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
    • H01P1/20327—Electromagnetic interstage coupling
    • H01P1/20354—Non-comb or non-interdigital filters
    • H01P1/20381—Special shape resonators
    • 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
    • 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
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • 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
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/08—Strip line resonators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Definitions

  • the invention relates to a filter, in particular to a miniaturized filter.
  • the purpose of the present invention is to overcome the shortcomings of the prior art and provide a miniaturized filter that facilitates the design of the out-of-band suppression zero point in a limited tiny space.
  • a miniaturized filter includes a cabinet and at least two signal terminals provided on the cabinet, and the cabinet is provided with at least two layers and signals along its longitudinal direction.
  • a resonance unit that performs signal transmission at the end, and a shielding wall is provided between adjacent two layers of resonance units.
  • Each layer of resonance units includes a plurality of resonance structures that are vertically fixed in the box. At least two of the resonance structures are integrally formed. of.
  • the signal ends are disposed on the same side of the box.
  • the connected resonant structures are connected by a connecting rod, the connecting rod and the resonant structure are integrally formed, and coupling occurs between two adjacent resonant structures in the resonant structures connected in the same layer, and the same There is no coupling relationship between the unconnected resonant structures.
  • the resonance structure includes a resonance long arm and a resonance short arm which are vertically arranged, and a connection portion connecting the resonance long arm and the resonance short arm, and the length of the resonance long arm is greater than the length of the resonance short arm.
  • part or all of the lower end of the resonance short arm is formed with a bent portion bent in a direction close to the resonance long arm.
  • the resonance long arm, the resonance short arm, and the connection part are connected in an approximately H-shaped resonance structure.
  • a tuning groove is formed between the top of the resonance long arm, the connecting portion and the top of the resonance short arm, and the box is provided with a plurality of resonance tuning screws protruding into the tuning groove, each The tuning groove corresponds to a resonant tuning screw.
  • the shielding wall is vertically arranged in the box body, and an end portion of the shielding wall is integrally formed with or fixedly attached to the inner wall of the box body.
  • the shielding wall is provided with at least one first opening for coupling between adjacent two layers of resonance units, and the box body is further provided with a coupling adjusting screw that extends into the first opening.
  • the shielding wall is provided with at least one second opening
  • the box body is further provided with a zero-point coupling adjusting screw extending into the second opening.
  • the box body is provided with a plurality of resonance tuning screws that protrude into the tuning grooves, and each tuning groove corresponds to a resonance tuning screw.
  • a coupling gap is formed between two adjacent resonance structures of each layer, and a plurality of coupling tuning screws protruding into the coupling gap are provided on the box, and each coupling gap corresponds to one coupling tuning screw.
  • the resonance unit adopts a multilayer layout design, and the transmission zero design is relatively convenient.
  • the miniaturized H-type resonance structure is adopted, so that the coupling type and the coupling polarity of the zero point can be conveniently controlled, the use range is wider, and it can flexibly meet various customer requirements in a limited space.
  • Fine-tuning screws are installed at the groove of the H-shaped resonance structure, which can effectively adjust the resonance frequency within a certain range and improve the yield.
  • the H-type resonance units that have a coupling relationship are stably connected to each other to form a whole and be processed separately, which controls the accuracy and improves the consistency of the product.
  • FIG. 1 is a schematic diagram of an explosion structure of a filter of the present invention
  • FIG. 2 is a schematic structural diagram of a filter after the front cover of the present invention is unloaded
  • FIG. 3 is a schematic plan view of the structure of the present invention.
  • FIG. 4 is a schematic structural diagram of a resonance unit according to the present invention.
  • FIG. 5 is a schematic structural diagram of a resonator after assembly according to another embodiment of the present invention.
  • FIG. 6 is a schematic diagram of the exploded structure of FIG. 5.
  • a miniaturized filter disclosed in an embodiment of the present invention includes a cabinet 100, a signal terminal 110, and at least two layers of resonance units 120.
  • the cabinet 100 specifically includes a body 101, The front cover plate 102 and the rear cover plate 103.
  • the main body 101 preferably has a rectangular parallelepiped structure. The front and rear sides are open, and the remaining end surfaces are closed. The front cover plate 102 and the rear cover plate 103 are respectively closed. It is fixed on the front and rear sides of the opening of the box 100.
  • the signal terminal 110 is disposed on the cabinet 100, and at least two signal terminals 110 are provided.
  • the signal terminals 110 may be distributed on the same side of the body 101, or on different sides, or may be respectively disposed on the front and rear covers of the box 100.
  • the signal terminal 110 specifically includes a signal input terminal 111 and a signal output terminal 112.
  • two signal terminals 110 are provided on the body 101, and the two signal terminals 110 are distributed on the same side of the body 100, each of which is a signal.
  • the input terminal 111 and one signal output terminal 112 may of course be provided with more than two signal terminals 110, such as two signal input terminals 111 and one signal output terminal 112.
  • a hollow cavity 130 is formed in the body, and the resonance unit 120 is disposed in the cavity 130.
  • the multilayer resonance units 120 are distributed in the cavity 130 along the longitudinal direction of the cavity 130 (that is, the front-back direction of the cabinet 100 in FIG. 1).
  • the design of the multilayer resonance unit 120 in the body 101 makes the design of the zero point of the filter relatively convenient.
  • Each layer of the resonance unit 120 is vertically fixed in the body 101 as a whole. In this embodiment, the lower end of the resonance unit 120 is fixed on the bottom wall of the cavity 130.
  • each layer of the resonance unit 120 includes multiple resonance structures 121, and the multiple resonance structures 121 are distributed in the cavity 130 along the lateral direction of the cavity (that is, the left-right direction in FIG. 1).
  • Each resonance structure 121 is integrally formed and All are fixed in the cavity 130 vertically, and the multiple resonance structures 121 are all located on the same plane.
  • two resonance structures 121 or more than three resonance structures 121 having a coupling relationship are connected through a connecting rod 140 to be integrally formed.
  • each layer of the resonance unit 120 is designed as a whole and is integrally formed.
  • each layer of the resonance unit 120 may be connected between two adjacent resonance structures 121 through a connecting rod 140, and other resonance structures 121 are not connected.
  • two adjacent two resonance structures 121 are connected by a connecting rod 140, and other resonance structures 121 are not connected, and so on.
  • Whether the resonance structures 121 are connected is mainly designed according to the requirements of product structure and performance. It should be noted that coupling occurs between two adjacent resonant structures 121 between resonant structures 121 connected on the same layer, and there is no coupling relationship between resonant structures 121 that are not connected on the same layer.
  • Each layer of the resonance unit 120 is provided with a signal access portion (not shown) at one end of the body side wall (defined as the left side wall of the body for convenience of description) of the signal end 110, and the resonance unit 120 communicates with the signal through the signal access portion
  • the terminal 110 realizes signal transmission.
  • each layer of the resonance unit 120 corresponds to one signal terminal 110.
  • two layers of the resonance unit 120 are provided in the body 101, of which one layer of the resonance unit 120 and the signal input terminal 11 Signal transmission is performed, and another layer of resonance unit 120 and signal output terminal 112 perform signal transmission.
  • each resonant structure 121 specifically includes a resonant long arm 123, a resonant short arm 124, and a connecting portion 125, wherein the resonant long arm 123 and the resonant short arm 124 are both vertically disposed in the body 101, and the resonant long arm
  • the length of 123 is longer than the length of the resonant short arm 124.
  • the connecting portion 125 connects the two resonance arms 123 and 124, and two ends thereof are integrally formed with the corresponding resonance long arm 123 and the resonance short arm 124.
  • a downward recessed tuning groove 126 is formed between the top of the resonance long arm 123, the connection portion 125 and the top of the resonance short arm 124, for adjusting the resonance frequency.
  • the resonance long arm 123, the resonance short arm 124, and the connection portion 125 in this embodiment preferably have or are approximately H-shaped resonance structures. Due to the electromagnetic characteristics of the H-type resonance structure, when two H-type resonance structures are on the same plane and adjacent to each other (that is, two adjacent resonance structures 121 of each layer of resonance unit), one of them is rotated along its own central axis by 180 After that, its coupling polarity will be inductive and capacitive. If two adjacent resonant structures 121 generate a coupling form that is based on capacitive coupling as the main inductive coupling, then the two resonant structures 121 The distance between them does not change.
  • each layer of the resonance unit 120 is composed of four resonance structures 121, of which the lower end of the resonance short arm 124 of the three resonance structures 121 is formed with a bent portion 127, and one is not designed with the bent portion 127.
  • the replacement design is two with bends 127, two without or other simple alternatives, etc.
  • the bending portion 127 is not limited to being formed by bending the lower end of the resonance short arm 124 in the direction close to the resonance long arm 123. It can also be integrally formed in other positions of the resonance structure 121 according to actual design requirements, as shown in FIG. 6 .
  • a shielding wall 150 is provided between two adjacent layers of resonance units 120 to prevent signal crosstalk between the resonance units 120.
  • the shielding wall 150 is vertically located inside the body 101 and its end is integrally formed with or fixedly attached to the inner wall of the body 101.
  • the shielding wall 150 is provided with at least one first opening 151 for coupling between adjacent two layers of resonance units 120.
  • the shielding wall 150 is far from the left side wall of the body 101 (that is, close to the left side wall).
  • a first opening 151 is formed at one end of the right side wall of the body 101, and the first opening 151 communicates with the two rightmost resonance structures 121 of the two adjacent resonance units 120, so that the two resonance structures 121 are coupled, thereby Coupling of the two-layer resonance unit 120 is achieved.
  • the two H-type resonance structures are parallel to each other (that is, two adjacent layers of resonance units 120). Opening holes in different parts of the shielding wall 150 can facilitate capacitive or inductive coupling.
  • At least one second opening 152 may be provided on the shielding wall 150 to facilitate the generation of the filter transmission zero point.
  • the setting position of the second opening 152 is based on the formed zero point between the two-layer resonance unit 120 (that is, Null value in the frequency response) position.
  • the sizes of the first opening 151 and the second opening 152 are designed according to actual needs.
  • the shielding wall 150 can be provided with other resonance units 120 according to needs. Coupling adjustment or to facilitate the creation of openings such as transmission zero.
  • the body is provided with a plurality of resonance tuning screws 160 protruding into the tuning groove 126, and each tuning groove 126 corresponds to a resonance tuning screw 160, which can effectively adjust the resonance frequency within a certain range and improve the yield.
  • a coupling gap 170 is formed between two adjacent resonance structures 121 of each layer, and a plurality of coupling adjusting screws 180 extending into the coupling gap 170 are provided on the body 101, and each coupling gap 170 corresponds to one coupling adjusting screw 180.
  • the main body 101 is also provided with a coupling adjusting screw 180 extending into the first opening 151 and a zero-point adjusting adjusting screw 190 extending into the second opening 152.
  • the resonance unit of the present invention adopts a multi-layer arrangement design, and is designed as a miniaturized H-type resonance structure in combination with the resonance structure 121 to realize the convenient design of the out-of-band suppression zero point in a limited micro space, thereby flexibly meeting various customer requirements in a limited space. Wider range of use.

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

Abstract

本发明揭示了一种小型化滤波器，包括一箱体和设置在箱体上的至少两个信号端，所述箱体内沿其纵向设置有至少两层与信号端进行信号传输的谐振单元，相邻两层谐振单元之间设置有屏蔽墙，每层谐振单元包括多个竖向固定于箱体内的谐振结构，所述谐振结构中至少有两个是一体成型的。本发明实现在有限微小空间中方便设计带外抑制零点。

Description

一种小型化滤波器 技术领域
本发明涉及一种滤波器，尤其是涉及一种小型化滤波器。
背景技术
随着通信技术日新月异的发展，客户对体积的要求越来越苛刻。往往需要在有限的微小空间设计谐振器以及抑制零点来满足带内带外插损抑制要求，而传统的几种同轴及其加载变形谐振单元已很难满足这种微小体积下的设计要求。
发明内容
本发明的目的在于克服现有技术的缺陷，提供一种在有限微小空间中方便设计带外抑制零点的小型化滤波器。
为实现上述目的，本发明提出如下技术方案：一种小型化滤波器，包括一箱体和设置在箱体上的至少两个信号端，所述箱体内沿其纵向设置有至少两层与信号端进行信号传输的谐振单元，相邻两层谐振单元之间设置有屏蔽墙，每层谐振单元包括多个竖向固定于箱体内的谐振结构，所述谐振结构中至少有两个是一体成型的。
优选地，所述信号端设置在箱体的同一侧面上。
优选地，所述相连的谐振结构之间通过连接杆连接，所述连接杆与谐振结构一体成型，所述同一层相连的谐振结构中相邻的两个谐振结构之间发生耦合，所述同一层不相连的谐振结构之间没有耦合关系。
优选地，所述谐振结构包括竖向设置的谐振长臂和谐振短臂，及连接谐振长臂和谐振短臂的连接部，所述谐振长臂的长度大于谐振短臂的长度。
优选地，部分或全部所述谐振短臂的下端形成有向靠近谐振长臂方向折弯的折弯部。
优选地，所述谐振长臂、谐振短臂和连接部连接呈或近似呈H型谐振结构。
优选地，所述谐振长臂的顶部、连接部与谐振短臂的顶部之间形成有调谐凹槽，所述箱体上设置有多个伸入到调谐凹槽内的谐振调螺，每个调谐凹槽对应一个谐振调螺。
优选地，所述屏蔽墙在箱体内竖向设置且其端部与箱体的内壁一体成型或固定贴合。
优选地，所述屏蔽墙上开设有至少一个使相邻两层谐振单元之间耦合的第一开孔，所述箱体上还设置有伸入到第一开孔内的耦合调螺。
优选地，所述屏蔽墙上开设有至少一个第二开孔，所述箱体上还设置有伸入到第二开孔内的零点耦合调螺。
优选地，所述箱体上设置有多个伸入到调谐凹槽内的谐振调螺，每个调谐凹槽对应一个谐振调螺。
优选地，每层相邻两个谐振结构之间形成有耦合间隙，所述箱体上设置有多个伸入到所述耦合间隙的耦合调螺，每个耦合间隙对应一个耦合调螺。
本发明的有益效果是：
1、谐振单元采用多层排布设计，传输零点设计相对方便。
2、采用小型化的H型谐振结构，从而方便地控制耦合类型和零点的耦合极性，使用范围更广，可以在有限空间灵活满足各种客户要求。
3、H型谐振结构凹槽处加装微调螺钉，可实现在一定范围内对谐振频率进行有效调节，提高了成品率。
4、为了有效控制安装精度，提高调试一致性，将有耦合关系的H型谐振单元都彼此稳定地连接，成为一片整体单独加工，控制了精度，提高了 产品一致性。
附图说明
图1是本发明滤波器的爆炸结构示意图；
图2是本发明滤波器前盖板卸载后的结构示意图；
图3是本发明的俯视结构示意图；
图4是本发明谐振单元的结构示意图；
图5是本发明另一实施例谐振器组装后的结构示意图；
图6是图5的爆炸结构示意图。
附图标记：
100、箱体，101、本体，102、前盖板，103、后盖板，110、信号端，111、信号输入端，112、信号输出端，120、谐振单元，121、谐振结构，123、谐振长臂，124、谐振短臂，125、连接部，126、调谐凹槽，127、折弯部，130、腔体，140、连接杆，150、屏蔽墙，151、第一开孔，152、第二开孔，160、谐振调螺，170、耦合间隙，180、耦合调螺，190、零点耦合调螺。
具体实施方式
下面将结合本发明的附图，对本发明实施例的技术方案进行清楚、完整的描述。
结合图1～图3所示，本发明实施例所揭示的一种小型化滤波器，包括箱体100、信号端110和至少两层谐振单元120，其中，箱体100具体包括一本体101、前盖板102和后盖板103，本体101优选呈或近似呈长方体的结构，其前、后两侧面均为开口状，其余端面为闭合状，前盖板102和后盖板103分别盖合固定在箱体100开口的前、后侧面上。
信号端110设置在箱体100上，至少设置两个信号端110，信号端110可以分布于本体101的同一侧面上，也可以是不同侧面上，也可分别设置在箱体100的前后盖板上102、103上。信号端110具体包括信号输入端111 和信号输出端112，如本实施例中，本体101上设置有两个信号端110，两个信号端110分布于本体100的同一侧面上，分别是一个信号输入端111和一个信号输出端112，当然也可设置两个以上信号端110，如两个信号输入端111和一个信号输出端112等。
本体内形成一中空的腔体130，谐振单元120设置于该腔体130内。具体地，本体101内设置至少两层谐振单元120，多层谐振单元120在腔体130内沿腔体130纵向(即图1中箱体100的前后方向)分布。本体101内多层谐振单元120的设计，使得滤波器的零点设计相对方便。每层谐振单元120则整体竖向固定于本体101内，本实施例中，谐振单元120的下端固定于腔体130的底壁上。
结合图4所示，每层谐振单元120包括多个谐振结构121，多个谐振结构121在腔体130内沿腔体横向(即图1中左右方向)分布，每个谐振结构121一体成型且均竖向固定于腔体130内，且多个谐振结构121均位于同一平面上。优选地，将有耦合关系的两个谐振结构121或者三个以上的多个谐振结构121通过连接杆140连接，一体成型。本实施例1中，因两个信号端设置在靠近谐振单元120两端的本体101的一个同一侧面上，所以相应设计每层谐振单元120都是一个整体，是一体成型的，具体地，相邻两个谐振结构121之间通过一连接杆140连接，连接杆140与谐振结构121一体成型，每层谐振单元120一体成型的结构，增加了结构稳定性及提高安装精度，且由于每层谐振单元120可以整体单独加工，控制了精度提高了产品一致性。在其他可替换实施例中，结合图5和图6所示，每层谐振单元120也可以是相邻的两个谐振结构121之间通过一连接杆140连接，其它谐振结构121之间不相连；或者是相邻的三个谐振结构121之间两两之间通过连接杆140连接，其它谐振结构121之间则不相连，依次类推。主要根据产品结构及性能的需求来设计谐振结构121之间是否相连。 需要说明的是，同一层相连的谐振结构121之间相邻的两个谐振结构121之间发生耦合，而同一层不相连的谐振结构121之间则没有耦合关系。
每层谐振单元120靠近设置信号端110的本体侧壁(为了方便描述，定义为本体的左侧壁)的一端上设置信号出入部(图未示)，谐振单元120通过该信号出入部与信号端110实现信号传输，本实施例中，每层谐振单元120对应一个信号端110，如本实施例中，本体101内对应设置两层谐振单元120，其中一层谐振单元120与信号输入端11进行信号传输，另一层谐振单元120与信号输出端112进行信号传输。
本实施例中，每个谐振结构121具体包括谐振长臂123、谐振短臂124和连接部125，其中，谐振长臂123和谐振短臂124均竖向设置于本体101内，且谐振长臂123的长度长于谐振短臂124的长度。连接部125连接这两个谐振臂123、124，且其两端与对应的谐振长臂123、谐振短臂124之间一体成型。
优选地，谐振长臂123的顶部、连接部125与谐振短臂124的顶部之间形成有向下凹陷的调谐凹槽126，用于调节谐振频率。
本实施例的谐振长臂123、谐振短臂124和连接部125之间优选呈或近似呈H型谐振结构。由于H型谐振结构的电磁特殊性，当两个H型谐振结构处于同一平面且相邻(即每层谐振单元的相邻两个谐振结构121)时，将其中一个沿它自身中心轴旋转180度后，其耦合极性会感性、容性互易，如相邻两个谐振结构121之间产生以容性耦合为主感性耦合为辅的一种耦合形式，那么将两个谐振结构121之间的距离不发生变化，只将这两个谐振结构121中间的一个沿中心轴旋转180度后，两者之间的耦合形式发生变化，原来为辅的感性耦合增强，可能变成以感性耦合为主以容性耦合为辅，也有可能仍是以容性耦合为主感性耦合为辅但感性耦合增强了。利用H型谐振结构这一特点，在有限微小空间中设计带外抑制零点非常方便，有极大优势。
另外，基于滤波器的设计参数要求考虑，每层谐振单元120的部分或者全部的谐振结构121的谐振短臂124的下端设计有向靠近谐振长臂123方向折弯的折弯部127，用于调节谐振结构121的谐振频率，弯折部127延伸出的越长频率越低，且该折弯部127结构的设计，明显减小了每个谐振结构121的尺寸，有效降低了整个滤波器重量和体积。如本实施例中，每层谐振单元120由四个谐振结构121组成，其中三个谐振结构121的谐振短臂124的下端形成有折弯部127，一个没有设计折弯部127，如也可以替换设计为两个具有折弯部127，两个没有或其他简单的替换方案等。另外，折弯部127也不限于由谐振短臂124的下端向靠近谐振长臂123方向折弯形成，也可以根据实际设计需要，一体成型于谐振结构121的其他位置上，如图6所示。
相邻两层谐振单元120之间设置有屏蔽墙150，用于防止谐振单元120之间的信号串扰。本实施例中，屏蔽墙150竖直位于在本体101内竖向设置且其端部与本体101的内壁一体成型或固定贴合。优选地，屏蔽墙150上开设有至少一个第一开孔151，用于使相邻两层谐振单元120之间耦合，本实施例中，在屏蔽墙150远离本体101的左侧壁(即靠近本体101的右侧壁)的一端开设一第一开孔151，该第一开孔151连通相邻两层谐振单元120最右端的两个谐振结构121，使这两个谐振结构121耦合，从而实现这两层谐振单元120的耦合。另外，由于H型谐振结构上述耦合极性会感性、容性互易的电磁特殊性，当两个H型谐振结构所处平面相互平行(即相邻两层谐振单元120)时，在它们之间的屏蔽墙150不同部位开孔，可以方便得到容性或感性的耦合。
更进一步地，屏蔽墙150上还可开设有至少一个第二开孔152，便于产生滤波器传输零点，第二开孔152的设置位置根据两层谐振单元120之间的形成的零点(即，频率响应中的空值)位置而设置。第一开孔151和第二开孔152的大小根据实际需要设计，当然，屏蔽墙150上除第一、第 二开孔151、152外，还可根据需要，开设其他用于谐振单元120之间耦合调节或便于产生传输零点等开孔。
本体上设置有多个伸入到调谐凹槽126内的谐振调螺160，每个调谐凹槽126对应一个谐振调螺160，可实现在一定范围内对谐振频率进行有效调节，提高了成品率。每层相邻两个谐振结构121之间形成有耦合间隙170，本体101上设置有多个伸入到该耦合间隙170的耦合调螺180，每个耦合间隙170对应一个耦合调螺180。另外，本体101上还设置有伸入到第一开孔151内的耦合调螺180，及伸入到第二开孔152内的零点耦合调螺190，这些调螺的设置，使得本发明在采用特殊的H型谐振结构缩小了每个谐振结构121的电尺寸的同时，又保持了滤波器参数可以有效调节，从而在降低了整个滤波器重量和体积同时，成品率更高，从而降低了滤波器成本。
本发明的谐振单元采用多层排布设计，结合谐振结构121设计为小型化的H型谐振结构，实现在有限微小空间中方便设计带外抑制零点，从而在有限空间灵活满足各种客户要求，使用范围更广。
本发明的技术内容及技术特征已揭示如上，然而熟悉本领域的技术人员仍可能基于本发明的教示及揭示而作种种不背离本发明精神的替换及修饰，因此，本发明保护范围应不限于实施例所揭示的内容，而应包括各种不背离本发明的替换及修饰，并为本专利申请权利要求所涵盖。

Claims (10)

  1. 一种小型化滤波器，其特征在于，包括一箱体和设置在箱体上的至少两个信号端，所述箱体内沿其纵向设置有至少两层与信号端进行信号传输的谐振单元，相邻两层谐振单元之间设置有屏蔽墙，每层谐振单元包括多个竖向固定于箱体内的谐振结构，所述谐振结构中至少有两个是一体成型的。
  2. 根据权利要求1所述的小型化滤波器，其特征在于，所述相连的谐振结构之间通过连接杆连接，所述连接杆与谐振结构一体成型，所述同一层相连的谐振结构中相邻的两个谐振结构之间发生耦合，所述同一层不相连的谐振结构之间没有耦合关系。
  3. 根据权利要求1所述的小型化滤波器，其特征在于，所述谐振结构包括竖向设置的谐振长臂和谐振短臂，及连接谐振长臂和谐振短臂的连接部，所述谐振长臂的长度大于谐振短臂的长度。
  4. 根据权利要求3所述的小型化滤波器，其特征在于，部分或全部所述谐振短臂的下端形成有向靠近谐振长臂方向折弯的折弯部。
  5. 根据权利要求3所述的小型化滤波器，其特征在于，所述谐振长臂、谐振短臂和连接部连接呈或近似呈H型谐振结构。
  6. 根据权利要求3所述的小型化滤波器，其特征在于，所述谐振长臂的顶部、连接部与谐振短臂的顶部之间形成有调谐凹槽，所述箱体上设置有多个伸入到调谐凹槽内的谐振调螺，每个调谐凹槽对应一个谐振调螺。
  7. 根据权利要求1所述的小型化滤波器，其特征在于，所述屏蔽墙在箱体内竖向设置且其端部与箱体的内壁一体成型或固定贴合。
  8. 根据权利要求1或7所述的小型化滤波器，其特征在于，所述屏蔽墙上开设有至少一个使相邻两层谐振单元之间耦合的第一开孔，所述箱体上还设置有伸入到第一开孔内的耦合调螺。
  9. [根据细则91更正 14.08.2019]　
    根据权利要求1或7所述的小型化滤波器，其特征在于，所述屏蔽墙上开设有至少一个第二开孔，所述箱体上还设置有伸入到第二开孔内的零点耦合调螺。
  10. 根据权利要求1所述的小型化滤波器，其特征在于，每层相邻两个谐振结构之间形成有耦合间隙，所述箱体上设置有多个伸入到所述耦合间隙的耦合调螺，每个耦合间隙对应一个耦合调螺。
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