WO2020248688A1 - 介质谐振器 - Google Patents

介质谐振器 Download PDF

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Publication number
WO2020248688A1
WO2020248688A1 PCT/CN2020/084349 CN2020084349W WO2020248688A1 WO 2020248688 A1 WO2020248688 A1 WO 2020248688A1 CN 2020084349 W CN2020084349 W CN 2020084349W WO 2020248688 A1 WO2020248688 A1 WO 2020248688A1
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Prior art keywords
dielectric
resonator
metal
gasket
cavity
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PCT/CN2020/084349
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English (en)
French (fr)
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杨锋
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中兴通讯股份有限公司
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Publication of WO2020248688A1 publication Critical patent/WO2020248688A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/10—Dielectric 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

Definitions

  • This application relates to the field of wireless communication, and specifically to a dielectric resonator.
  • the single resonant cavity in the existing metal cavity filter technology consists of a metal cavity 101, a cavity cover 102, a tuning screw and nut assembly 103, and a resonator 104, wherein the resonator 104 is fastened by screws, Welding, riveting, etc. are fixed to the installation step of the metal cavity 101.
  • the cavity cover 102 and the metal cavity 101 are tightly combined by cover screws or high temperature welding to form a closed electromagnetic environment.
  • the tuning screw and nut assembly 103 can tune the single cavity frequency.
  • the structure is in the resonator 104 and
  • the embodiment of the present application provides a dielectric resonator.
  • the filling material between the metal resonator and the shielding cover is changed to a dielectric gasket with ⁇ >1, thereby increasing the capacitance between the resonator and the shielding cover and reducing
  • the resonant frequency of a single cavity can solve the problem of miniaturization of the filter.
  • the embodiment of the application provides a dielectric resonator, the dielectric resonator includes a resonant cavity, a shielding cover, a tuning screw assembly, a resonator base, a dielectric gasket, and an elastic metal structure, the resonant cavity and the shielding cover
  • the plates are connected to form a closed electromagnetic environment, the resonator base is firmly connected to the resonant cavity and the dielectric gasket; the elastic metal structure is fastened to the dielectric gasket; the tuning screw assembly is tightly connected to the dielectric gasket The tuning screw assembly enters into the cavity through the threaded hole, and the single cavity frequency is adjusted by rotating the screw.
  • Figure 1 is a schematic structural diagram of an existing metal cavity filter
  • FIG. 2 is a schematic diagram of Embodiment 1 of the present application.
  • FIG. 3 is an exploded schematic diagram of Embodiment 1 of the present application.
  • FIG. 4 is a schematic diagram of Embodiment 2 of the present application.
  • Fig. 5 is a schematic diagram of Embodiment 3 of the present application.
  • Fig. 6 is a schematic diagram of Embodiment 4 of the present application.
  • the dielectric resonator of the embodiment of the present application includes a resonant cavity 201, a shielding cover 202, a tuning screw assembly 203, a resonator base 204, a dielectric gasket 205, and an elastic metal structure 206.
  • the resonant cavity 201 is made of plastic material, aluminum alloy or other metals.
  • the surface of the cavity has a metal plating layer with good conductivity such as silver or copper.
  • the bottom of the cavity can be flat, or a resonator mounting platform 2011 is provided on the bottom of the cavity. .
  • the shielding cover 202 is a thin plate made of aluminum alloy or other metal or plastic material, and the surface has a metal plating layer with good conductivity such as silver or copper; the shielding cover 202 is fastened to the resonant cavity 201 by screws or welding. Form a closed electromagnetic environment.
  • the resonator base 204 is a traditional metal resonator structure with good surface plating; the resonator base 204 is fastened to the bottom of the resonant cavity 201 by screws, riveting or welding, or fastened to the resonator mounting table 2011,
  • the installation form is not limited.
  • the dielectric gasket 205 has a ring structure with a dielectric constant ⁇ >1.
  • the upper and lower end surfaces of the dielectric gasket 205 have metallized coatings; the lower surface of the dielectric gasket 205 is firmly connected with the upper surface of the resonator base 204 by welding, bonding, and crimping.
  • the elastic metal structure 206 is an elastic washer or other metal structure that can achieve elastic contact, and the specific structure is not limited.
  • the elastic metal structure 206 is firmly connected with the upper surface of the dielectric gasket 205 by welding, bonding, and crimping.
  • the elastic metal structure 206 is in good contact with the shielding cover 202 to form a double-ended short circuit of the resonator.
  • the shielding cover 202 is provided with a threaded hole, the tuning screw assembly 203 enters the cavity through the threaded hole, and the single cavity frequency is adjusted by rotating the screw.
  • Fig. 3 is an exploded schematic diagram of Embodiment 1 of the present application, where a, b, c, d, e, and f respectively correspond to the drawing identifiers 201, 202, 203, 204, 205, and 206 in Fig. 2.
  • the dielectric resonator of the embodiment of the present application includes a metal cavity 301, a shielding cover 302, a tuning screw assembly 303, a resonator base 304, a dielectric gasket 305, and an elastic metal structure 306.
  • the resonant cavity 301 is made of aluminum alloy or other metal or plastic materials.
  • the surface of the cavity has a metal plating layer with good conductivity such as silver or copper.
  • the bottom of the cavity can be flat, or a resonator mounting table 3011 is provided on the bottom of the cavity. .
  • the shielding cover 302 is a thin plate of aluminum alloy or other metal or plastic material, and the surface is coated with silver or copper with good conductive properties; the shielding cover 302 is fastened to the resonant cavity 301 by screwing or welding , Forming a closed electromagnetic environment.
  • the resonator base 304 is a traditional metal resonator structure.
  • the resonator disk surface has a ring-shaped raised structure 3041, and the surface is well plated; the resonator base 304 is fastened to the bottom of the resonant cavity 301 by screws, riveting or welding. Or it can be fastened on the resonator mounting table 3011, and the installation form is not limited.
  • the dielectric gasket 305 has a ring-shaped structure with a dielectric constant ⁇ >1; the lower end of the dielectric gasket 305 has a ring-shaped groove structure 3051.
  • the groove size is riveted with the ring-shaped protrusion structure 3041 of the resonator base.
  • the upper and lower ends of the dielectric gasket are provided with metallized coating.
  • the elastic metal structure 306 is an elastic washer or other metal structure that can achieve elastic contact, and the specific structure is not limited; the elastic metal structure 306 and the upper surface of the dielectric gasket 305 are tightly welded, bonded, crimped, etc. Solid connection.
  • the elastic metal structure 306 is in good contact with the shielding cover 302 to form a double-ended short circuit of the resonator.
  • the shielding cover 302 is provided with threaded holes, the tuning screw assembly 303 passes through the threaded holes and enters the cavity, and the single cavity frequency is adjusted by rotating the screw.
  • the dielectric resonator of the embodiment of the present application includes a metal cavity 401, a cavity cover 402, a tuning screw assembly 403, a metal resonator base 404, a dielectric gasket 405, and an elastic metal structure 406.
  • the surface of the resonant cavity 401 has a metal plating layer with good conductivity such as silver or copper, and the bottom of the cavity can be flat, or a resonator mounting platform 4011 is provided at the bottom of the cavity.
  • the cavity cover 402 is a thin plate of aluminum alloy or other metal or plastic material, and the surface has a metal plating layer with good conductivity such as silver or copper; the cavity cover 402 is fastened to the metal cavity 401 by screws or welding Above, forming a closed electromagnetic environment.
  • the metal resonator base 404 is a traditional metal resonator structure with good surface plating; the metal resonator base 404 is fastened to the bottom of the resonant cavity 401 by screws, riveting or welding, or fastened to the resonator mounting table 4011 Above, the installation form is not limited.
  • the dielectric spacer 405 has a ring structure with a dielectric constant ⁇ >1; the dielectric spacer 405 has a ring structure with a dielectric constant ⁇ >1; the inner side of the lower end surface of the dielectric spacer 405 has a ring-shaped raised structure 4051, which The convex structure is riveted with the inner hole of the metal resonator base 404 to limit the displacement of the dielectric gasket in the horizontal direction.
  • the upper end of the dielectric gasket is provided with a metalized coating.
  • the elastic metal structure 406 is an elastic washer or other metal structure that can achieve elastic contact.
  • the specific structure is not limited; the elastic structure 406 and the upper surface of the dielectric gasket 405 are fastened by welding, bonding, crimping, etc. connection.
  • the elastic metal structure 406 is in good contact with the tuning cover 402 to form a double-ended short circuit of the resonator.
  • the tuning cover plate 402 is provided with a threaded hole, the tuning screw assembly 403 passes through the threaded hole and enters the cavity, and the screw is rotated to complete the adjustment of the single cavity frequency.
  • the dielectric resonator of the embodiment of the present application includes a metal cavity 501, a cavity cover 502, a tuning rod assembly 503, a metal resonator base 504, a dielectric spacer 505 and an elastic metal structure 506.
  • the resonant cavity 501 is made of aluminum alloy or other metals or plastic materials.
  • the surface of the cavity has a metal plating layer with good conductivity such as silver or copper.
  • the bottom of the cavity can be flat or a resonator mounting platform 5011 can be provided.
  • the tuning cover 502 is a thin plate made of aluminum alloy or other metal or plastic material, and the surface has a metal plating layer with good conductivity such as silver or copper; the tuning cover 502 is fastened to the resonant cavity 501 by screws or welding. Form a closed electromagnetic environment.
  • the metal resonator base 504 is a traditional metal resonator structure with good surface plating; the resonator 504 is fastened to the bottom of the resonant cavity 501 by screwing, riveting or welding, or fastened to the resonator mounting platform 5011 ,
  • the installation form is not limited.
  • the dielectric gasket 505 has a ring-shaped structure with a dielectric constant ⁇ >1; the lower end surface of the dielectric gasket 505 has a ring-shaped raised structure 5051 on the outside, which is riveted with the outer edge of the metal resonator base 504 to To limit the displacement of the dielectric gasket in the horizontal direction, the upper end surface of the dielectric gasket 505 has a metalized coating.
  • the elastic metal structure 506 is an elastic washer or other metal structure that can achieve elastic contact.
  • the specific structure is not limited; the elastic structure 506 and the upper surface of the dielectric gasket 505 are fastened by welding, bonding, crimping, etc. connection.
  • the elastic metal structure 506 is in good contact with the tuning cover 502 to form a double-ended short circuit of the resonator.
  • the tuning cover plate 502 is provided with a threaded hole, the tuning screw assembly 503 enters the cavity through the threaded hole, and the single cavity frequency is adjusted by rotating the screw.
  • the resonator base of the dielectric resonator of the present application is tightly connected with the resonant cavity and the dielectric gasket; the elastic metal structure is tightly connected with the dielectric gasket; the tuning screw assembly is tightly connected with the dielectric gasket, It is connected with the shielding cover plate to form a double-ended short circuit of the resonator. Since the dielectric constant of the dielectric gasket is greater than that of air, the capacitance between the resonator and the shielding cover plate is increased, and the resonance frequency of the single cavity is reduced.
  • the elastic metal structure is used to ensure that the resonator and the shielding cover are well grounded in the high and low temperature environment, and the elastic metal structure avoids the metal expansion coefficient in the high and low temperature environment It is relatively large and causes damage to the loaded media.

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Abstract

本申请提供了一种介质谐振器，所述介质谐振器包括谐振腔体、屏蔽盖板、调谐螺杆组件、谐振器底座、介质垫片以及弹性金属结构件，所述谐振腔体与屏蔽盖板连接形成封闭的电磁环境，所述谐振器底座分别与谐振腔体、介质垫片紧固连接；所述弹性金属结构件与介质垫片紧固连接；所述调谐螺杆组件与介质垫片紧固连接，并与屏蔽盖板连接形成谐振器双端短路，所述调谐螺杆组件通过螺纹孔进入到腔体内部，通过转动螺杆对单腔频率进行调节。

Description

介质谐振器
相关申请的交叉引用
本申请基于申请号为201910502991.6、申请日为2019年6月11日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此以引入方式并入本申请。
技术领域
本申请涉及无线通信领域，具体而言，涉及一种介质谐振器。
背景技术
随着通讯技术的发展，通信设备的竞争力主要体现在了小体积、轻重量、低成本的方面。滤波器作为天馈系统的重要组成部分，体积极限小型化、轻量化也成为重要演进方向。如图1所示，现有金属腔滤波器技术中的谐振单腔由金属腔体101、腔体盖板102、调谐螺杆和螺母组件103、谐振器104，其中谐振器104通过螺钉紧固、焊接、铆压等方式固定到金属腔体101的安装台阶上，腔体盖板102和金属腔体101通过盖板螺钉或者高温焊接方式紧密结合，形成封闭的电磁环境，谐振器104正上方的调谐螺杆和螺母组件103可对单腔频率进行调谐。根据平行板电容公式C＝εS/d(其中ε为两平行板间介质的介电常数，S为两个平板的正对面积，d为两平板的垂直距离)，该结构在谐振器104和腔体盖板102之间填充介质为空气，空气介电常数ε＝1，不能满足滤波器体积小型化的需求。
发明内容
本申请实施例提供了一种介质谐振器，将金属谐振器和屏蔽盖板之间的填充材料改为ε＞1的介质垫片，从而增加了谐振器与屏蔽盖板之间的电容，降低了单腔的谐振频率，可解决滤波器体积小型化的问题。
本申请实施例提供一种介质谐振器，所述介质谐振器包括谐振腔体、屏蔽盖板、调谐螺杆组件、谐振器底座、介质垫片以及弹性金属结构件，所述谐振腔体与屏蔽盖板连接形成封闭的电磁环境，所述谐振器底座分别 与谐振腔体、介质垫片紧固连接；所述弹性金属结构件与介质垫片紧固连接；所述调谐螺杆组件与介质垫片紧固连接，并与屏蔽盖板连接形成谐振器双端短路，所述调谐螺杆组件通过螺纹孔进入到腔体内部，通过转动螺杆对单腔频率进行调节。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
附图1现有的金属腔滤波器结构示意图；
附图2本申请实施例一的示意图；
附图3本申请实施例一的爆炸示意图；
附图4本申请实施例二的示意图；
附图5本申请实施例三的示意图；
附图6本申请实施例四的示意图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本申请。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
实施例一
如图2所示，本申请实施例的介质谐振器包括谐振腔体201，屏蔽盖板202，调谐螺杆组件203，谐振器底座204，介质垫片205，弹性金属结构件206。
所述谐振腔体201为塑胶材料、铝合金或其他金属，腔体表面有银或铜等导电性能良好的金属镀层，腔内底部可以为平面，或者在腔内底部设有谐振器安装台2011。
所述屏蔽盖板202为铝合金或其他金属、塑胶材料的薄板，表面有银或者铜等导电性能良好的金属镀层；屏蔽盖板202通过螺钉或者焊接的方 式紧固于谐振腔体201上，形成封闭的电磁环境。
所述谐振器底座204为传统金属谐振器结构形式，表面电镀良好；谐振器底座204通过螺钉、铆接或者焊接的方式紧固于谐振腔体201底部，或者紧固于谐振器安装台2011上，安装形式不限。
所述介质垫片205为环形结构，介电常数ε>1。介质垫片205上下两个端面有金属化涂层；介质垫片205下表面与谐振器底座204上盘面焊接、粘结、压接等结构形式紧固连接。
所述弹性金属结构件206为弹性垫圈或其他可实现弹性接触的金属结构件，具体结构不限。弹性金属结构件206与介质垫片205上表面焊接、粘结、压接等结构形式紧固连接。
所述弹性金属结构件206与所述屏蔽盖板202接触良好形成谐振器双端短路。所述屏蔽盖板202上设有螺纹孔，调谐螺杆组件203通过螺纹孔并进入到腔体内部，通过转动螺杆对单腔频率进行调节。
参照图3，图3是本申请实施例一的爆炸示意图，其中a、b、c、d、e、f分别对应附图2中的附图标识201、202、203、204、205、206。
实施例二
参照图4，本申请实施例的介质谐振器包括金属腔体301、屏蔽盖板302、调谐螺杆组件303、谐振器底座304、介质垫片305以及弹性金属结构件306。
所述谐振腔体301为铝合金或其他金属、塑胶材料，腔体表面有银或铜等导电性能良好的金属镀层，腔内底部可以为平面，或者在腔内底部设有谐振器安装台3011。
所述屏蔽盖板302为铝合金或其他金属、塑胶材料的薄板，表面有银或者铜等导电性能良好的金属镀层；屏蔽盖板302通过打螺钉或者焊接的方式紧固与谐振腔体301上，形成封闭的电磁环境。
所述谐振器底座304为传统金属谐振器结构形式，谐振器盘面有环状 凸起结构3041，表面电镀良好；谐振器底座304通过螺钉、铆接或者焊接的方式紧固于谐振腔体301底部，或者紧固于谐振器安装台3011上,安装形式不限。
所述介质垫片305为环形结构，介电常数ε>1；介质垫片305下端面有环状凹槽结构3051，该凹槽尺寸和谐振器底座环状凸起结构3041间隙铆合，以限制介质垫片在水平方向的位移，介质垫片上下端面有金属化涂层。
所述弹性金属结构件306为弹性垫圈或其他可实现弹性接触的金属结构件，具体结构不限；弹性金属结构件306与介质垫片305上表面以焊接、粘结、压接等结构形式紧固连接。
所述弹性金属结构件306与所述屏蔽盖板302接触良好形成谐振器双端短路。
所述屏蔽盖板302上设有螺纹孔，调谐螺杆组件303通过螺纹孔并进入到腔体内部，通过转动螺杆完成对单腔频率的调节。
实施例三
参照图5，本申请实施例的介质谐振器包括金属腔体401、腔体盖板402、调谐螺杆组件403、金属谐振器底座404、介质垫片405以及弹性金属结构件406。
所述谐振腔体401表面有银或铜等导电性能良好的金属镀层，腔内底部可以为平面，或者在腔内底部设有谐振器安装台4011。
所述腔体盖板402为铝合金或其他金属、塑胶材料的薄板，表面有银或者铜等导电性能良好的金属镀层；腔体盖板402通过螺钉或者焊接的方式紧固于金属腔体401上，形成封闭的电磁环境。
所述金属谐振器底座404为传统金属谐振器结构形式，表面电镀良好；金属谐振器底座404通过螺钉、铆接或者焊接的方式紧固于谐振腔体401 底部，或者紧固于谐振器安装台4011上，安装形式不限。
所述介质垫片405为环形结构，介电常数ε>1；所述介质垫片405为环形结构，介电常数ε>1；介质垫片405下端面内侧有环状凸起结构4051，该凸起结构与金属谐振器底座404内孔间隙铆合，以限制介质垫片在水平方向的位移，介质垫片上端面有金属化涂层。
所述弹性金属结构件406为弹性垫圈或其他可实现弹性接触的金属结构件，具体结构不限；弹性结构件406与介质垫片405上表面以焊接、粘结、压接等结构形式紧固连接。
所述弹性金属结构件406与所述调谐盖板402接触良好形成谐振器双端短路。
所述调谐盖板402上设有螺纹孔，调谐螺杆组件403通过螺纹孔并进入到腔体内部，转动螺杆完成对单腔频率的调节。
实施例四
参照图6，本申请实施例的介质谐振器包括金属腔体501、腔体盖板502、调谐杆组件503、金属谐振器底座504、介质垫片505以及弹性金属结构件506。
所述谐振腔体501为铝合金或其他金属、塑胶材料，腔体表面有银或铜等导电性能良好的金属镀层，腔内底部可以为平面或者设有谐振器安装台5011。
所述调谐盖板502为铝合金或其他金属、塑胶材料的薄板，表面有银或者铜等导电性能良好的金属镀层；调谐盖板502通过螺钉或者焊接的方式紧固于谐振腔体501上，形成封闭的电磁环境。
所述金属谐振器底座504为传统金属谐振器结构形式，表面电镀良好；谐振器504通过打螺钉、铆接或者焊接的方式紧固与谐振腔体501底部，或者紧固于谐振器安装台5011上,安装形式不限。
所述介质垫片505为环形结构，介电常数ε>1；介质垫片505下端面外侧有环状凸起结构5051，该凸起结构与金属谐振器底座504翻盘外沿间隙铆合，以限制介质垫片在水平方向的位移，介质垫片505上端面有金属化涂层。
所述弹性金属结构件506为弹性垫圈或其他可实现弹性接触的金属结构件，具体结构不限；弹性结构件506与介质垫片505上表面以焊接、粘结、压接等结构形式紧固连接。
所述弹性金属结构件506与所述调谐盖板502接触良好形成谐振器双端短路。
所述调谐盖板502上设有螺纹孔，调谐螺杆组件503通过螺纹孔并进入到腔体内部，通过转动螺杆完成对单腔频率的调节。
本申请的介质谐振器的谐振器底座分别与谐振腔体、介质垫片紧固连接；所述弹性金属结构件与介质垫片紧固连接；所述调谐螺杆组件与介质垫片紧固连接，并与屏蔽盖板连接形成谐振器双端短路，由于介质垫片的介电常数大于空气的介电常数，从而增加了谐振器与屏蔽盖板之间的电容，降低了单腔的谐振频率，有效减小了腔体的高度，实现滤波器的小型化；同时使用弹性金属结构件保证高低温环境下谐振器与屏蔽盖板接地良好，并且弹性金属结构件避免高低温环境下由于金属膨胀系数相对较大而造成加载介质损坏。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (10)

  1. 一种介质谐振器，包括谐振腔体、屏蔽盖板、调谐螺杆组件、谐振器底座、介质垫片以及弹性金属结构件，所述谐振腔体与屏蔽盖板连接形成封闭的电磁环境，所述谐振器底座分别与谐振腔体、介质垫片紧固连接；所述弹性金属结构件与介质垫片紧固连接；所述调谐螺杆组件与介质垫片紧固连接，并与屏蔽盖板连接形成谐振器双端短路，所述调谐螺杆组件通过螺纹孔进入到腔体内部，通过转动螺杆对单腔频率进行调节。
  2. 如权利要求1所述的介质谐振器，其中，介质垫片下端面有环状凹槽结构，凹槽尺寸和谐振器底座环状凸起结构间隙铆合，以限制介质垫片在水平方向的位移，介质垫片上下端面有金属化涂层。
  3. 如权利要求1所述的介质谐振器，其中，介质垫片下端面内侧有环状凸起结构，该凸起结构与金属谐振器底座内孔间隙铆合，以限制介质垫片在水平方向的位移，介质垫片上端面有金属化涂层。
  4. 如权利要求1所述的介质谐振器，其中，介质垫片下端面外侧有环状凸起结构，该凸起结构与金属谐振器底座翻盘外沿间隙铆合，以限制介质垫片在水平方向的位移，介质垫片上端面有金属化涂层。
  5. 如权利要求1所述的介质谐振器，其中，所述弹性金属结构件通过表面焊接、粘结或压接方式与介质垫片连接，其中，所述弹性金属结构件为弹性垫圈或其他实现弹性接触的金属结构件。
  6. 如权利要求1所述的介质谐振器，其中，所述谐振腔体为平面或设置谐振器安装台。
  7. 如权利要求1所述的介质谐振器，其中，所述谐振器底座为金属谐振器结构形式，并通过螺钉、铆接或者焊接的方式紧固于谐振腔体底部或者谐振器安装台。
  8. 如权利要求1至7任一项所述的介质谐振器，其中，所述谐 振腔体为金属或塑料材料，腔体表面有金属镀层。
  9. 如权利要求1至7任一项所述的介质谐振器，其中，所述屏蔽盖板为金属或塑料材料，盖板表面有金属镀层。
  10. 如权利要求1至7任一项所述的介质谐振器，其中，所述介质垫片为环形结构，介电常数ε>1。
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