WO2014180147A1 - 一种介质滤波装置 - Google Patents

一种介质滤波装置 Download PDF

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Publication number
WO2014180147A1
WO2014180147A1 PCT/CN2013/090256 CN2013090256W WO2014180147A1 WO 2014180147 A1 WO2014180147 A1 WO 2014180147A1 CN 2013090256 W CN2013090256 W CN 2013090256W WO 2014180147 A1 WO2014180147 A1 WO 2014180147A1
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WIPO (PCT)
Prior art keywords
metal cavity
dielectric
filter device
gasket
dielectric resonator
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PCT/CN2013/090256
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English (en)
French (fr)
Inventor
卜伟
康玉龙
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中兴通讯股份有限公司
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Publication of WO2014180147A1 publication Critical patent/WO2014180147A1/zh

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00Resonators of the waveguide type
    • H01P7/10Dielectric resonators

Definitions

  • the present invention relates to the field of filter technologies for mobile communication devices, and in particular, to a media filter device.
  • a dielectric material can be used instead of a conventional metal material, and the volume of the filter can be reduced under the same index.
  • Research on dielectric filters has been a hot topic in the communications industry. As an important component of wireless communication products, dielectric filters are of particular importance for the miniaturization of communication products.
  • the existing Transverse Magnetic (TM) mode dielectric filter structure is shown in FIG. 1.
  • the TM mode dielectric filter is mainly composed of a dielectric resonator column 103, a sealing cover 102, a tuning screw 101, and a metal cavity 104. composition.
  • the dielectric resonator column 103 is a hollow cylinder type, and a high electric field distribution exists at the joint portion of the upper and lower end faces and the metal cavity 104.
  • the upper end surface 103 of the dielectric resonator column is in close contact with or suspended from the metal cavity 104, and the lower end surface is in a short-circuit state in contact with the metal cavity 104.
  • the lower surface of the dielectric resonator column in the TM mode dielectric filter is in good contact with the surface of the metal cavity.
  • the lower surface of the dielectric resonator column 103 is directly soldered to the inner bottom surface of the metal cavity 104 so as to be in close contact with the bottom surface of the metal cavity 104.
  • the sealing cover 102 and the metal cavity 104 are fixed by screws to form a closed cavity.
  • the technical problem to be solved by the present invention is to provide a dielectric filter device in which a dielectric resonator column and a metal cavity can achieve good contact without soldering.
  • the medium filtering device includes: a dielectric resonator column, a metal cavity, a sealing cover, and a tuning screw, wherein the dielectric resonator column is located in a closed space composed of a sealing cover and a metal cavity.
  • a tuning screw is mounted on the sealing cover;
  • the device further includes: a gasket; the lower end of the dielectric resonator column is provided with a clamping component matched with the gasket, and when the gasket is fixedly connected with the bottom surface of the metal cavity, the clamping component is pressed to make the lower surface of the dielectric resonator column and the metal cavity The bottom surface of the body is in close contact.
  • the latching component at the lower end of the dielectric resonator column is a protrusion.
  • the latching component at the lower end of the dielectric resonator column is a step, and the pad edge is provided with a recess that matches the step.
  • the pad is fixed to the bottom surface of the metal cavity by adhesive bonding or by threading or by an interference fit.
  • the bottom surface of the metal cavity is provided with an upward screw, and the upward screw passes through the pad and is fixedly engaged with the nut of the upper surface of the pad.
  • the upward screw is inserted into the metal cavity from the outside, or the upward screw is integrally formed with the metal cavity.
  • the gasket has a dielectric constant of ⁇ 30.
  • the gasket has a dielectric constant ⁇ 10.
  • the gasket material is made of aluminum oxide or polytetrafluoroethylene.
  • FIG. 1 is a schematic diagram of a prior art TM mode dielectric filter
  • FIG. 2 is a schematic structural view of a dielectric filter device according to a first embodiment of the present invention
  • 3 is a schematic structural view of a dielectric filter device according to a second embodiment of the present invention
  • FIG. 1 is a schematic diagram of a prior art TM mode dielectric filter
  • FIG. 2 is a schematic structural view of a dielectric filter device according to a first embodiment of the present invention
  • 3 is a schematic structural view of a dielectric filter device according to a second embodiment of the present invention
  • FIG. 1 is a schematic diagram of a prior art TM mode dielectric filter
  • FIG. 2 is a schematic structural view of a dielectric filter device according to a first embodiment of the present invention
  • 3 is a schematic structural view of a dielectric filter device according to a second embodiment of the present invention
  • FIG. 1 is a schematic diagram of a prior art TM mode dielectric filter
  • FIG. 2 is a schematic structural
  • a first embodiment of the present invention includes the following components: a dielectric resonator column 203, a metal cavity 204, a sealing cover 202, and a tuning screw 201, wherein the dielectric resonator column 203 is located
  • the interior of the enclosed space consisting of the sealing cover 202 and the metal cavity 204 is a resonant cavity.
  • the sealing cover 202 is mounted with a tuning screw 201 for adjusting the resonant frequency.
  • the device further includes: a spacer 205; a lower end of the dielectric resonator column 203 is provided with a latching member that cooperates with the pad 205, and the latching member may be a protrusion or a step 206 as shown in FIG. 2, and the protrusion or the step 206 may also Located on the outer side of the hollow cylindrical dielectric resonator column 203, then the substrate 205 is also located at the periphery of the dielectric resonator column 203.
  • the rim of the spacer 205 is provided with a recess that coincides with the step 206.
  • the step 206 is used to receive the downward force of the pad 205.
  • the clamping member is pressed so that the lower bottom surface of the dielectric resonator column 203 is in close contact with the bottom surface of the metal cavity 204.
  • the bottom surface of the dielectric resonator column 203 is plated with silver or copper.
  • the dielectric constant of the gasket is ⁇ 30.
  • the dielectric constant of the gasket is ⁇ 10.
  • the gasket material may be aluminum oxide or polytetrafluoroethylene, but is not limited to these two materials.
  • a dielectric filter device includes the following components: a dielectric resonator column 303, a metal cavity 304, a sealing cover 302, and a tuning screw 301, wherein the dielectric resonator column 303 is located
  • the interior of the enclosed space consisting of the sealing cover 302 and the metal cavity 304 is a resonant cavity.
  • the sealing cover 302 is mounted with a tuning screw 301 for adjusting the resonant frequency.
  • the device further includes: a pad 306; a lower end of the dielectric resonator column 303 is provided with a latching member that cooperates with the pad 306, and the latching member can be a step 308.
  • the rim of the pad 306 is provided with a recess that coincides with the step 308.
  • the bottom surface of the metal cavity 304 is fixed by a thread.
  • the upper surface of the metal cavity 304 is provided with an upward screw 307.
  • the upper screw 307 passes through the gasket 306 and is fixed to the nut 305 on the upper surface of the gasket 306. .
  • the pressing step 308 causes the lower bottom surface of the dielectric resonator column 303 to be in close contact with the bottom surface of the metal cavity 304.
  • the upward screw 307 is inserted into the metal cavity 304 from the outside or integrally formed with the metal cavity 304.
  • the bottom surface of the dielectric resonator column 303 is plated with silver or copper.
  • the dielectric constant of the gasket is ⁇ 30.
  • the dielectric constant of the gasket is ⁇ 10.
  • the gasket material may be aluminum oxide or polytetrafluoroethylene, but is not limited to these two materials.
  • the dielectric resonator column 303 is loaded into the metal cavity 304 and concentric with the screw hole on the bottom surface of the metal cavity 304.
  • the upper screw 307 is driven from the outside into the screw hole at the bottom of the metal cavity 304, passes through the pad 306, and is screwed into the nut 305 to lock;
  • a dielectric filter device as shown in FIG. 4, includes the following components: a dielectric resonator 403, a metal cavity 404, a sealing cover 402, and a tuning screw 401, wherein the dielectric resonator 403 is located
  • the inside of the closed space composed of the sealing cover 402 and the metal cavity 404 is a resonant cavity, and the sealing cover 402 is mounted with a tuning screw 401 for adjusting the resonant frequency.
  • the device further includes: a gasket 406; a lower end of the dielectric resonator column 403 is provided with a latching member that cooperates with the gasket 406, and the latching member can be a step 408.
  • the lining of the pad 406 is provided with a recess that coincides with the step 408.
  • the bottom surface of the metal cavity 404 is fixed by a threaded engagement. Specifically, the bottom surface of the metal cavity 404 is provided with a threaded hole, and the threaded hole is engaged with the downward screw 405 passing through the gasket 406. At this time, the pressing step 408 causes the lower bottom surface of the dielectric resonator column 403 to be in close contact with the inner bottom surface of the metal cavity 404.
  • the bottom surface of the dielectric resonator column 403 is plated with silver or copper.
  • the dielectric constant of the gasket is ⁇ 30.
  • the dielectric constant of the gasket is ⁇ 10.
  • the gasket material may be aluminum oxide or polytetrafluoroethylene, but is not limited to these two materials.
  • the spacer 406 is loaded into the inner bottom of the dielectric resonator column 403; 2) the dielectric resonator column 403 is loaded into the metal cavity 404 and concentric with the screw hole of the bottom surface of the metal cavity 404;
  • the dielectric resonator device provided by the embodiment of the invention has the advantages that the dielectric resonator column and the metal cavity are in close contact without soldering, and the filter performance of the dielectric resonator is stable and reliable, the production process is simple, and the cost is low.
  • the temperature drift coefficient of the entire filter is compensated by adjusting the temperature expansion coefficient of the gasket material.
  • the Q factor of the quality factor is improved under the same volume, and the Q value of the medium cavity is maximized.
  • the technical solution provided by the embodiments of the present invention can be applied to the filter technology field of a communication device, and can also make the dielectric resonator column and the bottom surface of the metal cavity be in good contact without welding, thereby ensuring continuity of impedance and improving filtering. Performance and productivity increase costs.

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Abstract

本发明公开了一种介质滤波装置,包括:介质谐振柱、金属腔体、密封盖板和调谐螺钉,其中,介质谐振柱位于由密封盖板与金属腔体组成的封闭空间的内部,密封盖板上安装有调谐螺钉;该装置还包括:衬垫;该介质谐振柱下端设有与衬垫配合的卡位部件,衬垫与金属腔体内底面连接固定时,压迫卡位部件使得介质谐振柱下底面与金属腔体内底面紧密接触。本发明在无需焊接的情况下还能够使介质谐振柱与金属腔体底面良好接触,保证阻抗的连续性,提高滤波器的性能并提升生产效率降低成本。

Description

一种介质滤波装置
技术领域 本发明涉及移动通讯设备的滤波器技术领域, 尤其涉及一种介质滤波装置。 背景技术 电磁波在高介电常数物质中传播时, 其波长可以缩短, 利用这一理论, 可采用介 质材料代替传统金属材料, 在相同指标下, 滤波器的体积可以缩小。 对于介质滤波器 的研究一直是通信行业的热点。 介质滤波器作为无线通信产品重要部件, 对通信产品 的小型化具有特别重要的意义。 现有的横向磁场 (Transverse Magnetic, 简称为 TM) 模介质滤波器结构如图 1所 示, 通常 TM模介质滤波器主要由介质谐振柱 103、密封盖板 102、调谐螺钉 101和金 属腔体 104组成。 根据 TM模介质滤波器谐振腔的工作原理, 在正常工作时, 介质谐 振柱 103为空心圆柱型, 其上下端面及金属腔体 104结合部位存在高电场分布。 介质 谐振柱的上端面 103与金属腔体 104紧密接触或悬空, 下端面与金属腔体 104接触呈 短路状态。 如果下端面接触不充分, 会造成阻抗不连续, 场能量无法传输出去, 介质 的高介电常数、 高品质因数发挥不出来, 甚至会烧毁介质。 因此, TM模介质滤波器 中介质谐振柱下表面与金属腔体表面接触是否良好尤为关键。 介质谐振柱 103下表面直接焊接在金属腔体 104内底面上, 从而与金属腔体 104 底面紧密接触。密封盖板 102与金属腔体 104通过螺钉进行固定, 形成一个密闭腔体。 由于介质谐振柱 103的温度系数与金属材料不同, 一旦这种谐振腔受温度影响出现膨 胀或收缩时, 焊锡容易脱落, 严重影响滤波器的性能和使用寿命。 同时对介质谐振柱 103焊接工艺的要求非常高, 影响整个滤波器的成本和产能。 实用新型内容 本发明要解决的技术问题是, 提供一种介质滤波装置, 其介质谐振柱与金属腔体 能够在无需焊接的情况下实现良好接触。 本发明采用的技术方案是, 所述介质滤波装置, 包括: 介质谐振柱、 金属腔体、 密封盖板和调谐螺钉, 其中, 介质谐振柱位于由密封盖板与金属腔体组成的封闭空间 的内部, 密封盖板上安装有调谐螺钉; 所述装置还包括: 衬垫; 所述介质谐振柱下端设有与衬垫配合的卡位部件, 衬垫 与金属腔体内底面连接固定时, 压迫卡位部件使得介质谐振柱下底面与金属腔体内底 面紧密接触。 优选地, 所述介质谐振柱下端的卡位部件为突起。 优选地, 所述介质谐振柱下端的卡位部件为台阶, 所述衬垫边沿设有与所述台阶 吻合的凹部。 优选地, 所述衬垫与金属腔体内底面通过粘贴固定或者通过螺纹咬合固定或者通 过过盈配合固定。 优选地, 当所述衬垫与金属腔体内底面是通过螺纹咬合固定时, 所述金属腔体内 底面设有一向上螺钉, 所述向上螺钉穿过衬垫且与衬垫上表面的螺母咬合固定。 优选地, 所述向上螺钉为从外侧插入所述金属腔体, 或者所述向上螺钉与所述金 属腔体一体成型。 优选地, 当所述衬垫与金属腔体内底面是通过螺纹咬合固定时, 所述金属腔体内 底面设有一螺纹孔, 所述螺纹孔与穿过衬垫的向下螺钉咬合固定。 优选地, 所述衬垫的介电常数≤30。 优选的, 所述衬垫的介电常数≤10。 优选地, 所述衬垫材料采用三氧化二铝或者聚四氟乙烯。
采用上述技术方案, 本发明实施例至少具有下列优点: 本发明实施例所述介质滤波装置, 在无需焊接的情况下还能够使介质谐振柱与金 属腔体底面良好接触, 保证阻抗的连续性, 提高滤波器的性能并提升生产效率降低成 本。 附图说明 图 1 为现有技术 TM模介质滤波器的示意图; 图 2 为本发明第一实施例的介质滤波装置结构示意图; 图 3 为本发明第二实施例的介质滤波装置结构示意图; 图 4 为本发明第三实施例的介质滤波装置结构示意图。 具体实施方式 为更进一步阐述本发明实施例为达成预定目的所采取的技术手段及功效, 以下结 合附图及较佳实施例, 对本发明实施例进行详细说明如后。 本发明第一实施例, 一种介质滤波装置, 如图 2所示, 包括以下组成部分: 介质 谐振柱 203、 金属腔体 204、 密封盖板 202和调谐螺钉 201, 其中, 介质谐振柱 203位 于由密封盖板 202与金属腔体 204组成的封闭空间的内部, 该封闭空间为谐振腔, 密 封盖板 202上安装有调谐螺钉 201, 用于调节谐振频率。 该装置还包括: 衬垫 205 ; 介质谐振柱 203下端设有与衬垫 205配合的卡位部件, 该卡位部件可以为突起或者如图 2所示为台阶 206, 该突起或台阶 206也可以位于空 心圆柱型介质谐振柱 203的外侧, 那么此时衬底 205也位于介质谐振柱 203外围。 优选的,如图 2所示, 当介质谐振柱 203下端的卡位部件为台阶 206时,衬垫 205 边沿设有与台阶 206吻合的凹部。 台阶 206用于承接衬垫 205向下的施力。 衬垫 205与金属腔体 204内底面通过粘贴固定或者通过过盈配合固定时, 压迫卡 位部件使得介质谐振柱 203下底面与金属腔体 204内底面紧密接触。 介质谐振柱 203 下底面镀银或铜。 衬垫的介电常数≤30, 优选的, 衬垫的介电常数≤10。 衬垫材料可以采用三氧化二铝或者聚四氟乙烯, 但不限于这两种材料。 在衬垫 205与金属腔体 204内底面通过粘贴固定的情况下, 本实施例的介质滤波 装置的装配步骤可以按照下面的流程进行:
1 ) 在金属腔体 204底部涂抹粘合剂, 涂抹面积通过工装限制;
2) 将衬垫 205装入介质谐振柱 203内侧底部;
3 )使用工装和工具将介质谐振柱 203装入金属腔体 204底部,使得衬垫 205与粘 合剂充分压接接触;
4) 装配密封盖板 202; 5 ) 装配并调整调谐螺钉 201, 通过调整旋入腔内深度来控制谐振频率。
本发明第二实施例, 一种介质滤波装置, 如图 3所示, 包括以下组成部分: 介质 谐振柱 303、 金属腔体 304、 密封盖板 302和调谐螺钉 301, 其中, 介质谐振柱 303位 于由密封盖板 302与金属腔体 304组成的封闭空间的内部, 该封闭空间为谐振腔, 密 封盖板 302上安装有调谐螺钉 301, 用于调节谐振频率。 该装置还包括: 衬垫 306; 介质谐振柱 303下端设有与衬垫 306配合的卡位部件, 该卡位部件可以为台阶 308。 衬垫 306边沿设有与台阶 308吻合的凹部。 衬垫 306与金属腔体 304内底面通过螺纹咬合固定, 具体的, 金属腔体 304内底 面设有一向上螺钉 307, 向上螺钉 307穿过衬垫 306且与衬垫 306上表面的螺母 305 咬合固定。 此时, 压迫台阶 308使得介质谐振柱 303下底面与金属腔体 304内底面紧 密接触。 向上螺钉 307为从外侧插入金属腔体 304或者与金属腔体 304—体成型。 介 质谐振柱 303下底面镀银或铜。 衬垫的介电常数≤30, 优选的, 衬垫的介电常数≤10。 衬垫材料可以采用三氧化二铝或者聚四氟乙烯, 但不限于这两种材料。 本实施例的介质滤波装置的装配步骤可以按照下面的流程进行:
1 ) 将衬垫 306装入介质谐振柱 303内侧底部;
2) 将介质谐振柱 303装入金属腔体 304, 并与金属腔体 304底面的螺孔同心。
3 )将螺母 305放置于衬垫 306顶端并与衬垫 306上的通孔同心,使用工具限制螺 母 305不旋转;
4)将向上螺钉 307从外侧打入金属腔体 304底部的螺孔, 穿过衬垫 306, 旋入螺 母 305锁固;
5 ) 装配密封盖板 302;
6) 装配并调整调谐螺钉 301, 通过调整旋入腔内深度来控制谐振频率。 本发明第三实施例, 一种介质滤波装置, 如图 4所示, 包括以下组成部分: 介质 谐振柱 403、 金属腔体 404、 密封盖板 402和调谐螺钉 401, 其中, 介质谐振柱 403位 于由密封盖板 402与金属腔体 404组成的封闭空间的内部, 该封闭空间为谐振腔, 密 封盖板 402上安装有调谐螺钉 401, 用于调节谐振频率。 该装置还包括: 衬垫 406; 介质谐振柱 403下端设有与衬垫 406配合的卡位部件, 该卡位部件可以为台阶 408。 衬垫 406边沿设有与台阶 408吻合的凹部。 衬垫 406与金属腔体 404内底面通过螺纹咬合固定, 具体的, 金属腔体 404内底 面设有一螺纹孔, 螺纹孔与穿过衬垫 406的向下螺钉 405咬合固定。 此时, 压迫台阶 408使得介质谐振柱 403下底面与金属腔体 404内底面紧密接触。 介质谐振柱 403下 底面镀银或铜。 衬垫的介电常数≤30, 优选的, 衬垫的介电常数≤10。 衬垫材料可以采用三氧化二铝或者聚四氟乙烯, 但不限于这两种材料。 本实施例的介质滤波装置的装配步骤可以按照下面的流程进行:
1 ) 将衬垫 406装入介质谐振柱 403内侧底部; 2) 将介质谐振柱 403装入金属腔体 404, 并与金属腔体 404底面螺纹孔同心;
3 )将向下螺钉 405从顶面穿过介质谐振柱 403、 衬垫 406与金属腔体 404底面螺 纹孔咬合;
4) 装配密封盖板 402;
5 ) 装配并调整调谐螺钉 401, 通过调整旋入腔内深度来控制谐振频率
本发明实施例提供的介质谐振装置的优势在于: 无需焊接即可保证介质谐振柱与金属腔体紧密接触, 且介质谐振器的滤波性能稳 定可靠, 生产工艺简单, 成本较低。 通过调整衬垫材料的温度膨胀系数来补偿整个滤 波器的温漂系数。 同体积下比传统焊接方案, 品质因数 Q值有所提升, 最大限度发挥 出介质腔的 Q值。 通过具体实施方式的说明, 应当可对本发明为达成预定目的所采取的技术手段及 功效得以更加深入且具体的了解, 然而所附图示仅是提供参考与说明之用, 并非用来 对本发明加以限制。 工业实用性 本发明实施例提供的技术方案可以应用于通讯设备的滤波器技术领域, 在无需焊 接的情况下还能够使介质谐振柱与金属腔体底面良好接触, 保证阻抗的连续性, 提高 滤波器的性能并提升生产效率降低成本。

Claims

权 利 要 求 书 、 一种介质滤波装置, 包括: 介质谐振柱、 金属腔体、 密封盖板和调谐螺钉, 其 中, 介质谐振柱位于由密封盖板与金属腔体组成的封闭空间的内部,
所述装置还包括:衬垫;所述介质谐振柱下端设有与衬垫配合的卡位部件, 衬垫与金属腔体内底面连接固定时, 压迫卡位部件使得介质谐振柱下底面与金 属腔体内底面紧密接触。 、 根据权利要求 1所述的介质滤波装置, 其中, 所述介质谐振柱下端的卡位部件 为突起。 、 根据权利要求 1所述的介质滤波装置, 其中, 所述介质谐振柱下端的卡位部件 为台阶, 所述衬垫边沿设有与所述台阶吻合的凹部。 、 根据权利要求 1所述的介质滤波装置, 其中, 所述衬垫与金属腔体内底面通过 粘贴固定或者通过螺纹咬合固定或者通过过盈配合固定。 、 根据权利要求 4所述的介质滤波装置, 其中, 当所述衬垫与金属腔体内底面是 通过螺纹咬合固定时, 所述金属腔体内底面设有一向上螺钉, 所述向上螺钉穿 过衬垫且与衬垫上表面的螺母咬合固定。 、 根据权利要求 5所述的介质滤波装置, 其中, 所述向上螺钉为从外侧插入所述 金属腔体, 或者所述向上螺钉与所述金属腔体一体成型。 、 根据权利要求 4所述的介质滤波装置, 其中, 当所述衬垫与金属腔体内底面是 通过螺纹咬合固定时, 所述金属腔体内底面设有一螺纹孔, 所述螺纹孔与穿过 衬垫的向下螺钉咬合固定。 、 根据权利要求 1所述的介质滤波装置, 其中, 所述衬垫的介电常数≤30。 、 根据权利要求 8所述的介质滤波装置, 其中, 所述衬垫的介电常数≤10。
0、 根据权利要求 1至 9中任一项所述的介质滤波装置, 其中, 所述衬垫材料采用 三氧化二铝或者聚四氟乙烯。
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