WO2015168883A1 - 一种横磁（tm）模介质滤波器 - Google Patents

一种横磁（tm）模介质滤波器 Download PDF

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Publication number
WO2015168883A1
WO2015168883A1 PCT/CN2014/076963 CN2014076963W WO2015168883A1 WO 2015168883 A1 WO2015168883 A1 WO 2015168883A1 CN 2014076963 W CN2014076963 W CN 2014076963W WO 2015168883 A1 WO2015168883 A1 WO 2015168883A1
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WO
WIPO (PCT)
Prior art keywords
dielectric resonator
main cover
elastic
boss
cover plate
Prior art date
Application number
PCT/CN2014/076963
Other languages
English (en)
French (fr)
Inventor
袁本贵
郭玲
方群
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2014/076963 priority Critical patent/WO2015168883A1/zh
Priority to CN201480032799.0A priority patent/CN105308790B/zh
Priority to EP14891261.1A priority patent/EP3133691B1/en
Priority to EP18198755.3A priority patent/EP3518341B1/en
Priority to CA2948038A priority patent/CA2948038C/en
Publication of WO2015168883A1 publication Critical patent/WO2015168883A1/zh
Priority to US15/343,742 priority patent/US10333188B2/en

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Classifications

    • 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
    • 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
    • H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with 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
    • H01P1/207—Hollow waveguide filters
    • 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

Definitions

  • the present invention relates to a filter, and more particularly to a transverse magnetic (TM) mode dielectric filter.
  • the filter is widely used in the field of communication, especially in the field of radio frequency communication.
  • the filter is used to select the communication signal, filter out the clutter or interference signal outside the frequency of the communication signal, and retain the required in the passband. signal.
  • the current metal coaxial cavity filter has gradually failed to meet the demand due to its large size, Q value and power limitation. Since the dielectric filter has a high Qf and power capacity, it can be miniaturized, so the advantage is very obvious.
  • TM (Transverse Magnetic) mode dielectric filter has the above advantages, but because the TM filter needs to fully contact the upper and lower surfaces of the dielectric resonator and the cavity for long-term performance to ensure good performance and stability, how to fix the dielectric resonator Become the most critical technology.
  • a typical TM mode dielectric filter includes a cavity, a dielectric resonator disposed in the cavity, and a main cover.
  • the purpose of fixing a dielectric resonator is generally achieved by providing an elastic member such as a spacer or a thin cover plate which generates an elastic force to the dielectric resonator between the dielectric resonator and the main cover. Since the elastic member is partially located in the cavity, the elastic member needs to be electroplated in order to ensure electrical performance, thereby resulting in complicated process and high processing cost; and the elastic member is elastic, and has a certain curvature inside the cavity, causing current distribution. Uneven, affecting electrical performance; high-precision fit between elastic parts and cavities, elastic parts and main cover, elastic parts and media, to improve the difficulty of processing and assembly. Summary of the invention
  • the invention provides a transverse magnetic (TM) mode dielectric filter, which has low precision control requirements, low cost, and high reliability of electrical performance, thereby improving intermodulation performance and ensuring long-term stability.
  • TM transverse magnetic
  • a transverse magnetic (TM) mode dielectric filter including a housing, a dielectric resonator, a main cover plate, and an elastic member;
  • a cylindrical resonant cavity is formed in the housing, and an opening is disposed at one end of the resonant cavity of the housing;
  • the dielectric resonator is columnar, disposed in the resonant cavity and disposed coaxially with the resonant cavity; one end of the dielectric resonator is disposed on a bottom surface of the resonant cavity;
  • the main cover is fixed between the elastic member and the open end of the housing;
  • the main cover has an inner surface and an outer surface; a central portion of the inner surface of the main cover is attached to the other end of the dielectric resonator, and a peripheral edge thereof is attached to the open end of the housing;
  • the elastic member includes a plurality of elastic lobes; a plurality of the elastic lobes are evenly arranged around the axial direction of the dielectric resonator; one end of each of the elastic lobes is fixedly connected to the main cover, and the other end faces the
  • the central axis of the dielectric resonator extends to form a free end, and the free end of the elastic lobes elastically acts on a central portion of the outer surface of the main cover to provide an elastic force toward the dielectric resonator.
  • an inner surface of the main cover is a flat surface, and an end surface of the other end of the dielectric resonator is flush with an open end surface of the housing.
  • a central portion of an outer surface of the main cover is provided with a first boss, and the first boss is along a central axis of the dielectric resonator a protrusion and a protruding surface; the free end of the elastic flap elastically abuts against the protruding surface to elastically deform the elastic flap.
  • the cross-section of the first protrusion is the same as the outer edge shape of the cross-section of the dielectric resonator, the first The outer diameter of the boss is equal to or slightly larger than the outer diameter of the dielectric resonator.
  • annular groove is disposed between a periphery and a central portion of the outer surface of the main cover.
  • the elastic member further includes a positioning ring disposed around a central axis of the dielectric resonator and surrounding the outer surface of the main cover Each of the elastic flaps is fixed to the inner side of the ring of the positioning ring, and one end of the elastic flap is fixedly connected to the main cover plate through the positioning ring.
  • the positioning ring is integrally formed with a plurality of the elastic petals.
  • the elastic member is formed by a mechanically processed manner to form a plurality of strip-shaped grooves at the through hole by a plate having a through hole at the center, the strip shape One end of the groove is closed, the other end is open, and the open end thereof communicates with the through hole; between the two adjacent strip grooves The elastic flap is formed, and the positioning ring is formed at the closed end of the strip groove.
  • the TM mode dielectric filter further includes a tuning screw and a nut; the dielectric resonator is a hollow columnar structure;
  • a center of the main cover is provided with a threaded hole, and the tuning screw is screwed to the threaded hole, one end of which is located in the dielectric resonator, and the tuning screw is disposed between the inner wall of the dielectric resonator There is a gap; the nut is screwed to the tuning screw and abuts against the main cover.
  • a central portion of the main cover is further provided with a second protrusion, and the second protrusion is along a central axis of the dielectric resonator a protruding hole; the threaded hole is formed on the second boss, the nut abuts against the second boss, and the free ends of the plurality of elastic petals are located around the second boss.
  • the second boss in a case where a first boss is disposed at a central portion of an outer surface of the main cover, the second boss is disposed at the The second boss is connected to the first boss in a stepped shape, and the protruding surface is an annular stepped surface surrounding the second boss.
  • the main cover is matched with the housing and the dielectric resonator, and the elastic member is disposed at the outer surface of the main cover, and the elastic member does not need to be plated to reduce the processing cost, and the main cover is used.
  • the plate transmits the force, does not require high precision between the elastic member and the dielectric resonator, and has low tolerance requirements, thereby reducing the processing cost; generating pressure toward the dielectric resonator by a plurality of uniformly distributed elastic lobes, using the main cover The pressure is transmitted to the dielectric resonator, so that the pressure applied to the end face of the dielectric resonator is uniformly distributed in the axial direction, ensuring that the internal current density of the resonant cavity is uniform, and the electrical performance is ensured, so the intermodulation performance can be greatly improved and the long-term stability is maintained. , to avoid breakage of the dielectric resonator.
  • FIG. 1 is an exploded perspective view of a TM mode dielectric filter provided by a preferred embodiment of the present invention
  • FIG. 2 is an axial cross-sectional view of the TM mode dielectric filter of FIG.
  • Figure 3 is a schematic view of the main cover of the TM mode dielectric filter of Figure 1;
  • Figure 4 is a schematic illustration of the elastic members of the TM mode dielectric filter of Figure 1.
  • the present invention provides a transverse magnetic (TM) mode dielectric filter, which may be a TM01 main mode dielectric filter, and may of course be other forms of TM mode dielectric. filter.
  • the TM mode dielectric filter includes a housing 1, a dielectric resonator 2, a main cover 3, and an elastic member 4.
  • the main cover 3 and the elastic member 4 are fixed to the casing 1 and fix the dielectric resonator 2 in the casing 1; the elastic member 4 can provide an elastic force to the main cover 3 to subject the upper end surface of the dielectric resonator 2 to the main The flat pressure of the cover plate 3 is downward, thereby improving the intermodulation performance of the dielectric resonator 2.
  • a cylindrical resonant cavity 10 is formed in the housing 1, and an opening is formed in the housing 1 at one end of the resonant cavity 10.
  • the housing 1 is made of a metal material or a plastic alloy material, and has a certain metal element therein to shield electromagnetic waves.
  • the dielectric resonator 2 is columnar and disposed in the resonant cavity 10 and disposed coaxially with the resonant cavity 10, and one end of the dielectric resonator 2 abuts against the bottom surface of the resonant cavity 10.
  • the dielectric resonator 2 is generally made of a ceramic medium in which a rare metal such as rare earth can be doped. In the present embodiment, the dielectric resonator 2 is a hollow columnar structure.
  • the dielectric resonator 2 in the field of the TM mode dielectric filter, has a hollow columnar structure, and the dielectric resonator 2 has a columnar shape as a whole.
  • the central axis position defines a through hole penetrating through the dielectric resonator 2.
  • the center of the bottom surface of the resonant cavity 10 is provided with a positioning structure that cooperates with the dielectric resonator 2.
  • the positioning structure is a boss 10, and the positioning convexity
  • the outer diameter of the stage 10 is matched with the inner diameter of the dielectric resonator 2, and the outer diameter of the positioning boss 11 is matched with the inner diameter size and tolerance of the dielectric resonator 2 to achieve the bottom end of the dielectric resonator 2 and the housing 1.
  • the positioning ensures that the dielectric resonator 2 is not loosened when it is mounted on the positioning boss 11 on the bottom surface of the resonant cavity 10, and the dielectric resonator 2 is in a free state at this time, and can be replaced.
  • the positioning structure may be a positioning blind hole, the aperture of which matches the outer diameter of the dielectric resonator, and the dielectric harmonic
  • the vibrator 2 has a hollow structure or a solid column shape, and one end thereof can be inserted into the positioning blind hole to achieve positioning.
  • the main cover 3 has opposing inner and outer surfaces.
  • the inner surface of the main cover 3 is located on the surface inside the cavity 10, and the outer surface is the surface of the main cover 3 outside the cavity 10.
  • the central portion of the inner surface of the main cover 3 is attached to the other end of the dielectric resonator 2, and its peripheral edge is fitted to the open end of the casing 1.
  • the inner surface of the main cover 3 is flat, and the other end surface of the dielectric resonator 2 is flush with the open end surface of the casing 1.
  • the height of the dielectric resonator 2 is the same as the depth of the resonant cavity 10.
  • the peripheral edge of the main cover 3 is attached to the open end of the housing 1, and the main cover 3 is The central portion can be abutted and attached to the dielectric resonator 2 to facilitate the assembly connection while reducing the processing difficulty.
  • the inner surface of the main cover 3 is flat to ensure uniform current distribution in the cavity and to ensure the electrical performance of the filter.
  • the inner surface of the main cover 3 may not be a flat surface, and a central portion thereof may be provided with a protrusion that can abut against the end surface of the dielectric resonator 2 and make the dielectric resonator 2 The end face may be out of flush with the open end face of the housing 1.
  • the main cover plate 3 is made of metal material.
  • the main cover plate 3 can be made of aluminum, copper, steel, etc., so that the material having certain conductive properties can be used, and the main cover plate 3 can be realized by machine or die casting. .
  • the elastic member 4 is disposed at an outer surface of the main cover 3, and the elastic member 4 includes a positioning ring 42 and a plurality of elastic petals 41.
  • the positioning ring 42 is disposed around the central axis of the dielectric resonator 2 and is fixedly coupled to the outer periphery of the main cover 3.
  • the elastic flap 41 is fixed to the inner side of the ring of the positioning ring 42.
  • One end of the elastic flap 41 is fixedly connected to the main cover 3 through the positioning ring 42.
  • the positioning ring 42 can facilitate the assembly and connection of the plurality of elastic petals 41.
  • a plurality of elastic petals 41 are arranged around the axial direction of the dielectric resonator 2.
  • Each of the elastic petals 41 extends toward the central axis of the dielectric resonator 2 to form a free end; the free end of the elastic flap 41 elastically acts on the central portion of the outer surface of the main cover 3 to provide an elastic force toward the dielectric resonator 2.
  • the elastic flap 41 itself is elastic, and its free end relatively moves to generate an elastic force by utilizing the elastic deformation of the elastic flap itself.
  • the plurality of elastic petals 41 are plural and evenly distributed around the dielectric resonator 2, a uniform pressure toward the dielectric resonator 2 can be generated around the dielectric resonator 2, and the pressure applied to the main cover 3 is uniformly distributed around the circumference.
  • the upper end surface of the dielectric resonator 2 is simultaneously subjected to a uniform downward pressure of the main cover 3, which ensures that the internal current density of the resonant cavity 10 is uniform, so that the intermodulation performance of the dielectric resonator 2 can be improved. Since the pressure distribution is uniform and stable, there is no problem that the dielectric resonator 2 is broken due to excessive interference or excessive pressure due to excessive tolerance accumulation.
  • the elastic flap 41 and the positioning ring 42 are both plate-shaped, and the elastic flap 41 is flush with the positioning ring 42 in a free state for processing.
  • the positioning ring 42 and the plurality of elastic petals 41 may be integrally formed, and the elastic member 4 is mechanically processed by a plate having a through hole at the center, such as machine punching, wire cutting, or laser cutting, in a radial direction at the through hole.
  • a plurality of strip-shaped grooves 40 are defined. One end of the strip-shaped groove 40 is closed, the other end is open, and the open end thereof communicates with the through-hole 40.
  • the elastic flap 41 is formed between the adjacent two-shaped grooves 40, and the strip-shaped groove 40 is formed.
  • a positioning ring 42 is formed at the closed end to facilitate processing.
  • the number and size of the elastic flaps 41 can be determined according to actual product requirements, and the pressure formed is also different depending on the number and size of the elastic flaps 41.
  • the elastic member 4 can be made of spring steel, so that the elastic member 4 has the advantages of being elastic and stable for a long time, and the filter performance can be ensured for a long period of time, and the performance can be maintained even under severe environmental temperature.
  • the elastic member 4 may be made of a material having elasticity, a steel plate, or a composite material having elasticity, which can provide long-lasting stable elasticity.
  • the central portion of the outer surface of the main cover 3 is provided with a first boss 31, and the first boss 31 protrudes along the central axis of the dielectric resonator 2, and is formed with a protruding surface 31a;
  • the protruding surface 31a of the first boss 31 is away from the dielectric resonator with respect to the peripheral edge portion of the outer surface of the main cover 3, and the free end of the elastic flap 41 elastically abuts against the protruding surface 31a.
  • the central portion of the main cover 3 can have a height difference with respect to the periphery thereof, and the free end of the elastic flap 41 is away from the dielectric resonator after the elastic member 4, the main cover 3, and the housing 1 are assembled.
  • the elastic petals 41 are elastically deformed to generate an elastic force, thereby supplying pressure to the first boss 31 and the dielectric resonator 2.
  • the cross-section of the first boss 31 is the same as the outer edge shape of both the cross sections of the dielectric resonator 2, and the outer diameter of the first boss 31 is equal to or slightly larger than the outer diameter of the dielectric resonator 2 to ensure that the dielectric resonator is subjected to Uniform force.
  • the outer edge of the cross section of the first boss 31 is circular, that is, the first boss 31 is cylindrical, and the outer edge of the cross section of the dielectric resonator 2 is also circular. Accordingly, the outer peripheral edges of the cross sections of the first boss 31 and the dielectric resonator 2 may both be square or have other shapes.
  • the central portion of the main cover 3 may further be provided with a second boss 32.
  • the second boss 32 protrudes along the central axis of the dielectric resonator 2.
  • the threaded hole 30 is opened on the second boss 32, and the nut 6 abuts.
  • the free ends of the plurality of elastic petals 41 are located around the second boss.
  • the nut 6 and the elastic flap 41 respectively abut against different positions, and the second boss 32 can avoid the nut 6 from being elastic when the nut 6 is rotated.
  • the flap 41 affects disassembly.
  • the second boss 32 is disposed on the first boss 31, and the second boss 32 is connected to the first boss 32 in a stepped shape, and the protruding surface 31a is a ring shape surrounding the second boss. Step surface.
  • the main cover 3 is structurally arranged to prevent the nut 6 from hitting the elastic flap 41 while ensuring effective deformation of the elastic flap 41.
  • An annular groove 33 is provided between the periphery and the central portion of the outer surface of the main cover 3, and the thickness of the region between the center and the periphery of the main cover 3 can be reduced by the annular groove 33, and the annular groove 33 can ensure the force acting.
  • the tensile force generated by the deformation of the first boss 31 due to the force can be absorbed well and timely through the annular groove 33, because the area of the main cover 3 behind the annular groove 33 is increased. Thin, which facilitates deformation between the central portion of the main cover 3 and the peripheral edge, the reaction force generated on the first boss 31 is relatively small, so that the force of the elastic flap 41 can be sufficiently applied to the dielectric resonator 2.
  • the TM mode dielectric filter may further include a plurality of fastening screws 7 which are evenly arranged along the open end of the housing 1 so as to be received between the elastic member 4 and the main cover 3. Uniform force to ensure electrical performance.
  • the fastening screw 7 is threadedly connected to the open end of the housing 1 through the set ring 42 and the periphery of the main cover 3, and the elastic member 4 and the main cover 3 are fixed to the housing 1 by fastening screws 7 for convenient installation. And disassembly maintenance.
  • the fastening screw 7 is made of steel to ensure a certain structural strength and to ensure the reliability of the connection between the elastic member 4, the main cover 3 and the housing 1.
  • the fixed connection between the elastic member 4, the main cover 3, and the casing 1 may be achieved by welding, riveting, snapping, or the like.
  • the TM mode dielectric filter may also include a tuning screw 5 and a nut 6.
  • the center of the main cover 3 is provided with a threaded hole 30, and the tuning screw 5 is screwed to the threaded hole 30, and the nut 6 is screwed to the tuning screw 5 to lock the tuning screw 5 to the main cover 3.
  • One end of the tuning screw 5 is located in the dielectric resonator 2, and a gap is provided between the tuning screw 5 and the inner wall of the dielectric resonator 2, and tuning is performed by the tuning screw 5 to effect filtering.
  • the dielectric resonator 2 may be a solid column shape, and tuning and filtering may be performed by other means without providing the tuning screw 5 and the nut 6.
  • the invention cooperates with the structure of the main cover plate 3 by the elastic member 4, and realizes the interference crimping by utilizing the elasticity of the elastic valve 31, and does not require the dielectric resonator 2 to have a large interference amount, and is generated by a plurality of uniformly distributed elastic petals.
  • the pressure toward the dielectric resonator 2 causes a uniform and stable pressure around the dielectric resonator 2, which ensures that the internal current density of the resonator 10 is uniform and ensures electrical performance, so the intermodulation performance can be greatly improved. Improve and maintain long-term stability, avoiding the problem of improper pressure control and media breakage at ambient temperature.
  • the main cover 3 is fitted to the housing 1 and the dielectric resonator 2, and the elastic member 4 is disposed at the outer surface of the main cover 3.
  • the elastic member 4 does not need to be plated, thereby reducing the processing cost and eliminating the need for high precision between components.
  • the requirements for tolerances are low, thereby reducing the processing cost, and effectively solving the problems of various types of components, complicated assembly, and high precision requirements in the prior art.
  • the components of the TM mode dielectric filter provided by the present invention are connected by screw assembly without using a soldering scheme, and the elastic component 4 can still improve the intermodulation performance, and the dielectric resonator can be easily removed and replaced, so that Assembly and maintenance of TM mode dielectric filters.
  • a plurality of TM mode dielectric filters may constitute a filter module, wherein the plurality of housings 1 may have an integrated structure, that is, a plurality of resonant cavities may be opened on one large housing, and the plurality of elastic members may be In one piece, it is also possible to match multiple components with multiple resonators.
  • the elastic flap 41 and the positioning ring 42 are both plate-shaped, so as to be processed. It should be noted that the elastic flap 41 and the positioning ring 42 are not limited to a plate shape. In other embodiments, the elastic The flap 41 can also be rod-shaped or cylindrical, and the retaining ring 42 can also be annular block, frame or other shape.
  • the plurality of elastic petals 41 are connected to the unitary structure by the positioning ring 42, and the elastic petals 41 are fixedly coupled to the main cover by the positioning ring.
  • the elastic member 4 may include only a plurality of elastic petals 41.
  • the elastic petals 41 are mutually independent members, and the elastic petals 41 may be fixedly connected to the main cover one by one, and the elastic petals 41 are
  • the elongated strip has one end fixedly connected to the main cover 41 directly, for example, can be fastened by screws; the free end of the elastic flap 41 abuts against the first boss.
  • the first boss may be provided with a plurality of positioning structures, and the positioning structure may be a positioning hole, a positioning bump, a positioning groove, etc., and the positioning structure and the free end of the elastic flap are one-to-one Coordination, in order to facilitate the positioning of the free end of the elastic flap, to ensure that the strip-shaped elastic flap does not move, so that a plurality of elastic flaps are arranged above the main cover around the first boss, and the screw is tightened, and the layout is more flexible.
  • the deformation effect of the elastic flap 41 can be improved by using the first boss 31 as In another embodiment, the central portion of the main cover 3 may not be provided with the first boss 31.
  • the elastic flap 41 In the free state, the elastic flap 41 is designed to have a bent shape, and the free end thereof is bent toward the dielectric resonator 2, thereby making the elasticity The free end of the flap 41 can directly abut against the central portion of the outer surface of the main cover 3. After assembly, the free end can be moved away from the dielectric resonator but the elastic flap 41 is elastically deformed to provide pressure to the dielectric resonator. .
  • the free end of the elastic flap 41 abuts against the first boss, that is, the free end of the elastic flap 41 directly abuts against the main cover to apply a force to the central portion of the main cover 3;
  • a separate member may be provided at a central portion of the outer surface of the main cover to form a force receiving member that protrudes from the main cover, and the free end of the elastic flap 41 abuts against the force receiving member.

Abstract

一种横磁（TM）模介质滤波器，包括壳体、介质谐振器、主盖板及弹性件；介质谐振器设置在壳体的谐振腔中；主盖板固定在弹性件与壳体的开口端之间；弹性件包括多个弹性瓣；多个弹性瓣绕介质谐振器的轴向均匀排布；各弹性瓣的一端与主盖板固定连接，其自由端弹性作用于主盖板的外表面中心部位，以提供朝向介质谐振器的弹力。通过均布的多个弹性瓣产生朝向介质谐振器的压力，使介质谐振器周围产生均匀稳定的压力，保证谐振腔内部电流密度均匀一致，因此互调性能可以大幅提升且保持长期稳定；主盖板与壳体及介质谐振器贴合配合，弹性件设置于主盖板的外表面处，弹性件无需电镀处理，且不需要高精度的要求，从而降低加工成本。

Description

一种橫磁 ( TM ) 盾滤波審
技^!城
本发明涉及一种滤波器， 尤其涉及一种横磁（TM )模介质滤波器。 背景技术
滤波器作为一种频率选择装置被广泛应用于通信领域，尤其是射频通信领 域，在基站中滤波器用于选择通信信号， 滤除通信信号频率外的杂波或干扰信 号， 保留通带内需要的信号。 随着通讯领域对滤波器小型化、 高性能、 大功率 的可量产要求的逐步提升， 目前金属同轴腔体滤波器因其体积大， Q值和功率 受限等因素已经逐步不能满足需求，介质滤波器因具有较高的 Qf和功率容量， 可以实现小型化， 因此优势十分明显。
TM(Transverse Magnetic,横磁)模介质滤波器具备了上述的优势，但因 TM 滤波器需要将介质谐振器和腔体的上下表面长期充分接触才能保证性能良好 和稳定， 因此如何固定介质谐振器成为最关键的技术。通常的 TM模介质滤波 器包括腔体、 设置于腔体的介质谐振器和主盖板。
在现有技术中，通常通过在介质谐振器和主盖板之间设置对介质谐振器产 生弹性作用力的垫片、薄盖板等弹性件来达到固定介质谐振器的目的。 由于弹 性件会有部分位于腔体内， 为保证电气性能均需要对弹性件进行电镀，从而导 致工艺复杂，加工成本较高；且弹性件为产生弹力，在腔体内部具有一定弯曲， 造成电流分布不均， 影响电气性能； 弹性件与腔体、 弹性件与主盖板、 弹性件 与介质之间均要求高精度配合， 提高加工装配难度。 发明内容
本发明提供一种横磁（TM )模介质滤波器， 精度控制要求低， 成本低， 且能够保证电气性能的高可靠性， 从而可提升互调性能并保证长期稳定。
提供了一种横磁（TM )模介质滤波器， 包括壳体、 介质谐振器、 主盖 板及弹性件；
所述壳体内形成有柱状的谐振腔，所述壳体上位于所述谐振腔的一端处设 有开口； 所述介质谐振器为柱状， 其设置在所述谐振腔中并与所述谐振腔同轴设 置； 所述介质谐振器的一端 ·ί氏靠于所述谐振腔的底面； 其特征在于，
所述主盖板固定在所述弹性件与所述壳体的开口端之间；
所述主盖板具有相对的内表面与外表面；所述主盖板的内表面的中心部位 贴合于所述介质谐振器的另一端、 其周缘贴合于所述壳体的开口端；
所述弹性件包括多个弹性瓣；多个所述弹性瓣绕所述介质谐振器的轴向均 匀排布； 各所述弹性瓣的一端与所述主盖板固定连接、 另一端朝向所述介质谐 振器的中轴线延伸形成自由端，所述弹性瓣的自由端弹性作用于所述主盖板的 外表面中心部位， 以提供朝向所述介质谐振器的弹力。
在第一种可能的实现方式中， 所述主盖板的内表面为平面， 所述介质谐振 器的另一端端面与所述壳体的开口端端面平齐。
结合前述任一种实现方式，在第二种可能的实现方式中， 所述主盖板的外 表面中心部位设有第一凸台， 所述第一凸台沿所述介质谐振器的中轴线突起， 并形成有突出面； 所述弹性瓣的自由端弹性抵靠于所述突出面， 以使所述弹性 瓣产生弹性形变。
结合前述第二种可能的实现方式，在第三种可能的实现方式中， 所述第一 凸台的横截面与所述介质谐振器的横截面二者的外边缘形状相同， 所述第一 凸台的外径等于或略大于所述介质谐振器的外径。
结合前述任一种实现方式，在第四种可能的实现方式中， 所述主盖板的外 表面的周缘与中心部位之间设有环形槽。
结合前述任一种实现方式，在第五种可能的实现方式中， 所述弹性件还包 括定位环， 所述定位环绕介质谐振器的中轴线设置， 并与所述主盖板的外表面 周缘固定连接； 各所述弹性瓣固定于所述定位环的环内侧， 所述弹性瓣的一端 通过所述定位环与所述主盖板固定连接。
结合第五种可能的实现方式，在第六种可能的实现方式中， 所述定位环与 多个所述弹性瓣一体成型。
结合第六种可能的实现方式，在第七种可能的实现方式中， 所述弹性件由 中心设有通孔的板材通过机械加工方式在通孔处开设多个条形槽，所述条形槽 的一端闭合、 另一端开口， 其开口端连通至所述通孔； 相邻两所述条形槽之间 形成所述弹性瓣， 所述条形槽的闭合端处形成所述定位环。
结合前述任一种实现方式，在第八种可能的实现方式中， 所述 TM模介质 滤波器还包括调谐螺杆及螺母； 所述介质谐振器为中空的柱状结构；
所述主盖板的中心设有螺纹孔， 所述调谐螺杆螺纹连接于所述螺纹孔， 其 一端位于所述介质谐振器中，且所述调谐螺杆与所述介质谐振器的内壁之间设 有间隙； 所述螺母螺纹连接于所述调谐螺杆， 并抵靠于所述主盖板。
结合第八种可能的实现方式，在第九种可能的实现方式中， 所述主盖板的 中心部位还设有第二凸台， 所述第二凸台沿所述介质谐振器的中轴线突起； 所 述螺纹孔开设在所述第二凸台上， 所述螺母抵靠于所述第二凸台上， 多个所述 弹性瓣的自由端位于所述第二凸台的四周。
结合第九种可能的实现方式，在第十种可能的实现方式中，在所述主盖板 的外表面中心部位设有第一凸台的情况下，所述第二凸台设置在所述第一凸台 上，且所述第二凸台与所述第一凸台连接呈阶梯形， 所述突出面为环绕在所述 第二凸台四周的环形的阶梯面。
本发明提供的 TM模介质滤波器， 主盖板与壳体及介质谐振器贴合配合， 弹性件设置于主盖板的外表面处， 弹性件无需进行电镀处理， 降低加工成本， 利用主盖板传递作用力， 不需要弹性件与介质谐振器之间高精度的要求，对公 差要求低，从而降低加工成本； 通过均布的多个弹性瓣产生朝向介质谐振器的 压力， 利用主盖板将压力传递给介质谐振器，使介质谐振器端面受到的压力在 轴向上分布均勾稳定， 保证谐振腔内部电流密度均勾一致， 保证电气性能， 因 此互调性能可以大幅提升且保持长期稳定， 避免介质谐振器破碎。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施 例中所需要使用的附图作简单地介绍，显而易见地， 下面描述中的附图仅仅是 本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的 前提下， 还可以根据这些附图获得其他的附图。
图 1是本发明优选实施方式提供的 TM模介质滤波器的分解示意图； 图 2是图 1中 TM模介质滤波器的轴向剖面图； 图 3是图 1中 TM模介质滤波器的主盖板的示意图；
图 4是图 1中 TM模介质滤波器的弹性件的示意图。 实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是 全部的实施例。基于本发明中的实施例， 本领域普通技术人员在没有作出创造 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。
如图 1至图 4所示， 本发明提供的一种横磁（ TM )模介质滤波器， 该 TM 模介质滤波器可以为 TM01主模介质滤波器，当然也可以为其他形式的 TM模 介质滤波器。 TM模介质滤波器包括壳体 1、 介质谐振器 2、 主盖板 3、 及弹性 件 4。主盖板 3与弹性件 4固定于壳体 1， 并将介质谐振器 2固定在壳体 1内； 弹性件 4可向主盖板 3提供弹力， 以使介质谐振器 2的上端表面受到主盖板 3 向下的均匀压力， 从而提高介质谐振器 2的互调性能。
壳体 1内形成有柱状的谐振腔 10， 壳体 1上位于谐振腔 10的一端处设有 开口。 壳体 1为金属材质或者塑料合金材质制成， 其内具有一定金属元素以起 到屏蔽电磁波作用。 介质谐振器 2为柱状， 其设置在谐振腔 10并与谐振腔 10 同轴设置， 介质谐振器 2的一端抵靠于谐振腔 10的底面。 介质谐振器 2—般 为陶瓷介质制成， 其中可掺杂稀土等稀有金属。 本实施例中， 介质谐振器 2 为中空的柱状结构， 可以理解的是， 在 TM模介质滤波器领域中， 介质谐振器 2为中空的柱状结构是指， 介质谐振器 2整体为柱状， 其中心轴线位置开设有 一贯穿介质谐振器 2的通孔。
本实施例中， 谐振腔 10的底面中心位置设有与介质谐振器 2相配合的定 位结构， 本实施例中， 由于介质谐振器 2为中空的柱状结构， 定位结构为凸台 10， 定位凸台 10的外径与介质谐振器 2的内径相配合， 定位凸台 11的外径与 介质谐振器 2的内径尺寸与公差相匹配， 以实现介质谐振器 2的底端与壳体 1 之间的定位，保证介质谐振器 2安装在谐振腔 10底面的定位凸台 11上时不松 动， 且介质谐振器 2此时处于自由状态， 可以进行替换。 此处， 在另外的实施 方式中， 定位结构可以为定位盲孔， 其孔径与介质谐振器外径相配合， 介质谐 振器 2为中空结构或实心柱状其一端均可插入到定位盲孔中以实现定位。
主盖板 3 具有相对的内表面与外表面。 此处， 可以理解的是， 主盖板 3 的内表面位于谐振腔 10内的表面，外表面为主盖板 3位于谐振腔 10外的表面。 主盖板 3的内表面中心部位贴合于介质谐振器 2的另一端、其周缘贴合于壳体 1的开口端。 作为优选， 主盖板 3的内表面为平面， 介质谐振器 2的另一端端 面与壳体 1 的开口端端面平齐。 本实施例中， 介质谐振器 2的高度与谐振腔 10的深度相同， 主盖板 3与壳体 1装配后， 主盖板 3的周缘与壳体 1开口端 贴合，主盖板 3的中心部位即可抵靠并贴合于介质谐振器 2，以利于装配连接， 同时可降低加工难度。 主盖板 3 的内表面为平面可保证谐振腔内电流分布均 匀， 保证滤波器的电气性能。 此处， 作为另外的实施方式， 主盖板 3的内表面 也可以不是平面， 其中心部位可以设置凸起， 该凸起能够抵靠于介质谐振器 2 的端面， 并使得介质谐振器 2的端面可以与壳体 1的开口端端面不平齐。
本实施例中， 由于仅主盖板 3的内表面位于谐振腔 10中， 只需主盖板 3 的内表面电镀以保证谐振腔 10内的电气性能， 外表面可电镀亦可不电镀， 以 减少加工工序并降低加工成本。主盖板 3为金属材质制成，如主盖板 3可以为 铝、 铜、 钢等制成， 使其具有一定导电性能的材质均可， 主盖板 3可以通过机 加或者压铸等方式实现。
弹性件 4设置于主盖板 3的外表面处， 弹性件 4包括定位环 42及多个弹 性瓣 41。 定位环 42绕介质谐振器 2的中轴线设置， 并与主盖板 3的外表面周 缘固定连接。 弹性瓣 41固定于定位环 42的环内侧， 弹性瓣 41的一端通过定 位环 42与主盖板 3固定连接， 利用定位环 42能够方便多个弹性瓣 41的装配 连接。 多个弹性瓣 41绕介质谐振器 2的轴向均勾排布。各弹性瓣 41朝向介质 谐振器 2的中轴线延伸形成自由端； 弹性瓣 41的自由端弹性作用于主盖板 3 的外表面中心部位， 以提供朝向介质谐振器 2的弹力。 弹性瓣 41 自身具有弹 性， 其自由端相对移动利用弹性瓣自身的弹性形变可产生弹力。
由于弹性瓣 41为多个， 且环绕介质谐振器 2均布， 从而可在介质谐振器 2的四周产生均匀的朝向介质谐振器 2的压力， 保证主盖板 3受到的压力在四 周均匀分布，介质谐振器 2的上端面同时受到主盖板 3向下均匀的压力， 可保 证谐振腔 10内部电流密度均勾一致，因此可以提升介质谐振器 2的互调性能。 由于压力分布均匀稳定，不会因为涉及公差累计较多而使介质谐振器 2过盈或 压力过大而在温度循环变化时导致介质谐振器 2破碎的问题。
作为优选， 弹性瓣 41与定位环 42均为板状， 弹性瓣 41在自由状态下与 定位环 42平齐， 以便于加工制备。 定位环 42与多个弹性瓣 41可以为一体成 型，弹性件 4由中心设有通孔的板材通过机械加工方式，如机加冲压、线切割、 或激光切割等方法沿径向在通孔处开设多个条形槽 40，条形槽 40的一端闭合、 另一端开口， 其开口端连通至通孔 40， 相邻两条形槽 40之间形成所述弹性瓣 41， 条形槽 40的闭合端处形成定位环 42， 从而便于加工制备。 弹性瓣 41的 数目及尺寸可根据实际产品需要进行确定， 其形成的压力亦因弹性瓣 41的数 目及尺寸而不同。 弹性件 4可以为弹簧钢制成， 以使弹性件 4均有弹性稳定持 久的优点， 可以保证滤波器性能长期稳定， 即使在环境温度恶劣下也能保证性 能不变。 此处， 作为另外的实施方式， 弹性件 4亦可为具有弹性的钢板、 或具 有弹性的复合材料等能够提供长久持续稳定弹性的材质制成。
本实施例中， 主盖板 3的外表面中心部位设有第一凸台 31， 第一凸台 31 沿所述介质谐振器 2的中轴线突起， 并形成有突出面 31a; 在介质谐振器 2的 中轴线上， 第一凸台 31的突出面 31a相对主盖板 3的外表面周缘部位远离介 质谐振器， 弹性瓣 41的自由端弹性抵靠于所述突出面 31a。 利用第一凸台 31 可使得主盖板 3的中心部位相对其周缘存在高度差， 在弹性件 4、 主盖板 3、 与壳体 1装配后使弹性瓣 41的自由端向远离介质谐振器 2方向移动， 弹性瓣 41发生弹性形变而产生弹力， 从而向第一凸台 31及介质谐振器 2提供压力。
第一凸台 31的横截面与介质谐振器 2的横截面二者的外边缘形状相同， 第一凸台 31的外径等于或者略大于介质谐振器 2的外径， 以保证介质谐振器 受力均匀。 在本实施例中， 第一凸台 31的横截面的外边缘为圓形， 即第一凸 台 31为圓柱形， 介质谐振器 2的横截面外边缘亦为圓形。 相应地， 第一凸台 31与介质谐振器 2的横截面外周缘可均为方形或其他形状。
主盖板 3的中心部位还可以设有第二凸台 32， 第二凸台 32沿所述介质谐 振器 2的中轴线突起， 螺纹孔 30开设在第二凸台 32上， 螺母 6抵靠于第二凸 台 32上， 多个弹性瓣 41的自由端位于第二凸台的四周。 螺母 6与弹性瓣 41 分别抵靠于不同位置， 利用第二凸台 32可避免旋转螺母 6时螺母 6碰到弹性 瓣 41而影响拆装。
本实施例中， 第二凸台 32设置在第一凸台 31上， 且第二凸台 32与第一 凸台 32连接呈阶梯形， 突出面 31a为环绕在第二凸台四周的环形的阶梯面。 主盖板 3结构设置合理， 在保证弹性瓣 41有效形变的同时， 可避免螺母 6碰 到弹性瓣 41。
主盖板 3的外表面的周缘与中心部位之间设有环形槽 33， 利用环形槽 33 可减小主盖板 3的中心与周缘之间的区域的厚度， 环形槽 33可以保证当力作 用在第一凸台 31上时，第一凸台 31因受力发生形变产生的拉力能很好且及时 的通过环形槽 33吸收掉，因为增加了环形槽 33后下方的主盖板 3区域足够薄， 利于主盖板 3中心部位相对周缘之间的形变， 对第一凸台 31产生的反作用力 会相对较小， 从而能保证弹性瓣 41的力充分施加在介质谐振器 2上。
本实施例中， TM模介质滤波器进一步可以包括多个紧固螺钉 7， 多个紧 固螺钉 7沿壳体 1的开口端均匀排布，以使得弹性件 4与主盖板 3之间受力均 匀， 保证电气性能。 紧固螺钉 7依次穿设定位环 42及主盖板 3的周缘与壳体 1的开口端螺纹连接， 利用紧固螺钉 7将弹性件 4及主盖板 3固定至壳体 1， 方便安装及拆卸维护。紧固螺钉 7为钢材质制成，以保证其具有一定结构强度， 保证弹性件 4、 主盖板 3及壳体 1之间连接的可靠性。 此处， 作为另外的实施 方式， 亦可通过焊接、 铆接、 卡接等方式实现弹性件 4、 主盖板 3及壳体 1之 间的固定连接。
TM模介质滤波器还可以包括调谐螺杆 5及螺母 6。 主盖板 3的中心设有 螺纹孔 30，调谐螺杆 5螺纹连接于螺纹孔 30， 螺母 6与调谐螺杆 5螺纹连接， 以使调谐螺杆 5锁紧于主盖板 3。 调谐螺杆 5的一端位于介质谐振器 2中， 且 调谐螺杆 5与介质谐振器 2的内壁之间设有间隙，通过调谐螺杆 5进行调谐以 实现滤波。 此处， 作为另外的实施方式， 介质谐振器 2可以为实心的柱状， 而 无需设置调谐螺杆 5及螺母 6， 而通过其他方式进行调谐并实现滤波。
本发明通过弹性件 4与主盖板 3的结构配合， 利用弹性瓣 31的弹性实现 过盈压接， 不需要介质谐振器 2具有较大的过盈量，通过均布的多个弹性瓣产 生朝向介质谐振器 2的压力，使介质谐振器 2周围产生均匀稳定的压力， 可保 证谐振腔 10内部电流密度均勾一致， 保证电气性能， 因此互调性能可以大幅 提升且保持长期稳定，避免压力控制不当导致环境温度下介质破碎的问题。主 盖板 3与壳体 1及介质谐振器 2贴合配合，弹性件 4设置于主盖板 3的外表面 处， 弹性件 4无需进行电镀处理， 降低加工成本， 不需要部件之间高精度的要 求， 对公差要求低， 从而降低加工成本， 有效解决了现有技术中部件种类多、 装配复杂、 精度要求高的问题。
本发明提供的 TM模介质滤波器的各部件之间利用螺纹装配连接，而不釆 用焊接方案， 利用弹性件 4依然能够提升互调性能，且介质谐振器可以方便地 拆下进行更换， 以便对 TM模介质滤波器进行装配及维护。
本实施例中， 多个 TM模介质滤波器可以构成滤波器模块， 其中多个壳体 1可以为一体式结构， 即可在一个大壳体上开设多个谐振腔， 多个弹性件可以 为一体成型， 亦可为多个部件分别与多个谐振器——配合。
上述实施方式为发明的一种具体实施方式， 此外， 在上述实施方式中， 可 以通过对 TM模介质滤波器的部分技术特征进行一些修改及替换，以达到相同 或相似的技术效果，这些修改及替换包括但不局限于以下实施方式中的一种或 多种。
在上述实施方式中， 弹性瓣 41与定位环 42均为板状， 以便于加工制备， 需要说明的是，弹性瓣 41与定位环 42并不局限于板状，在其他的实施方式中， 弹性瓣 41还可以为杆状或柱状， 定位环 42还可以为环形的块状、框状或其他 形状。
在上述实施方式中， 利用定位环 42将多个弹性瓣 41连接为一体式结构， 弹性瓣 41通过定位环固定连接于主盖板。 作为另一种的实施方式， 弹性件 4 可仅包含多个弹性瓣 41， 各弹性瓣 41之间为相互的独立的部件， 可逐一将弹 性瓣 41与主盖板固定连接， 弹性瓣 41为长条形， 其一端直接与主盖板 41固 定连接， 比如可以通过螺钉紧固； 弹性瓣 41的自由端抵靠于第一凸台。 更进 一步， 为了便于弹性瓣 41的定位， 第一凸台上可以设有多个定位结构， 定位 结构可以为定位孔、 定位凸点、 定位槽等， 定位结构与弹性瓣的自由端一对一 配合， 以便于弹性瓣的自由端的定位， 保证条形的弹性瓣不窜动， 使多个弹性 瓣绕着第一凸台均勾布局在主盖板上方， 通过螺钉紧固， 布局更灵活。
在上述实施方式中， 利用第一凸台 31可提高弹性瓣 41的形变效果，作为 另外的实施方式， 主盖板 3的中心部位可以不设置第一凸台 31， 在自由状态 下， 弹性瓣 41被设计成弯折形状， 其自由端朝向介质谐振器 2弯折， 从而使 得弹性瓣 41的自由端能够直接抵靠于主盖板 3的外表面中心部位，在装配后， 自由端可朝向远离介质谐振器方向移动而是弹性瓣 41发生弹性形变， 以向介 质谐振器提供压力。
在上述实施方式中， 弹性瓣 41 的自由端抵靠于第一凸台， 即弹性瓣 41 的自由端直接抵靠于主盖板上， 以对主盖板 3的中心部位施加作用力； 作为另 外的实施方式，可以在主盖板的外表面中心部位设置单独的部件形成突出于主 盖板的受力件， 弹性瓣 41的自由端抵接于该受力件。 例如， 在将调谐螺杆、 螺母及主盖板装配后， 再装配弹性件， 并使弹性瓣 41的自由端抵靠于螺母， 从而利用螺母作为受力件， 弹性瓣间接对主盖板施加作用力。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对其限 制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通技术人员 应当理解： 其依然可以对前述各实施例所记载的技术方案进行修改， 或者对其 中部分技术特征进行等同替换； 而这些修改或者替换， 并不使相应技术方案的 本质脱离本发明各实施例技术方案的精神和范围。

Claims

权 利 要 求
1、 一种横磁（TM )模介质滤波器， 包括壳体、 介质谐振器、 主盖板及弹 性件；
所述壳体内形成有柱状的谐振腔，所述壳体上位于所述谐振腔的一端处设 有开口；
所述介质谐振器为柱状， 其设置在所述谐振腔中并与所述谐振腔同轴设 置； 所述介质谐振器的一端 ·ί氏靠于所述谐振腔的底面； 其特征在于，
所述主盖板固定在所述弹性件与所述壳体的开口端之间；
所述主盖板具有相对的内表面与外表面；所述主盖板的内表面的中心部位 贴合于所述介质谐振器的另一端、 其周缘贴合于所述壳体的开口端；
所述弹性件包括多个弹性瓣；多个所述弹性瓣绕所述介质谐振器的轴向均 匀排布； 各所述弹性瓣的一端与所述主盖板固定连接、 另一端朝向所述介质谐 振器的中轴线延伸形成自由端，所述弹性瓣的自由端弹性作用于所述主盖板的 外表面中心部位， 以提供朝向所述介质谐振器的弹力。
2、 如权利要求 1所述的 ΤΜ模介质滤波器， 其特征在于， 所述主盖板的 内表面为平面， 所述介质谐振器的另一端端面与所述壳体的开口端端面平齐。
3、 如权利要求 1或 2所述的 ΤΜ模介质滤波器， 其特征在于， 所述主盖 板的外表面中心部位设有第一凸台，所述第一凸台沿所述介质谐振器的中轴线 突起， 并形成有突出面； 所述弹性瓣的自由端弹性抵靠于所述突出面， 以使所 述弹性瓣产生弹性形变。
4、 如权利要求 3所述的 ΤΜ模介质滤波器， 其特征在于， 所述第一凸台 的横截面与所述介质谐振器的横截面二者的外边缘形状相同， 所述第一凸台 的外径等于或略大于所述介质谐振器的外径。
5、 如权利要求 1至 4任一项所述的 ΤΜ模介质滤波器， 其特征在于， 所 述主盖板的外表面的周缘与中心部位之间设有环形槽。
6、 如权利要求 1至 5任一项所述的 ΤΜ模介质滤波器， 其特征在于， 所 述弹性件还包括定位环， 所述定位环绕介质谐振器的中轴线设置， 并与所述主 盖板的外表面周缘固定连接； 各所述弹性瓣固定于所述定位环的环内侧， 所述 弹性瓣的一端通过所述定位环与所述主盖板固定连接。
7、 如权利要求 6所述的 TM模介质滤波器， 其特征在于， 所述定位环与 多个所述弹性瓣一体成型。
8、 如权利要求 7所述的 TM模介质滤波器， 其特征在于， 所述弹性件由 中心设有通孔的板材通过机械加工方式在通孔处开设多个条形槽，所述条形槽 的一端闭合、 另一端开口， 其开口端连通至所述通孔； 相邻两所述条形槽之间 形成所述弹性瓣， 所述条形槽的闭合端处形成所述定位环。
9、 如权利要求 1至 8任一项所述的 TM模介质滤波器， 其特征在于， 所 述 TM模介质滤波器还包括调谐螺杆及螺母；所述介质谐振器为中空的柱状结 构；
所述主盖板的中心设有螺纹孔， 所述调谐螺杆螺纹连接于所述螺纹孔， 其 一端位于所述介质谐振器中，且所述调谐螺杆与所述介质谐振器的内壁之间设 有间隙； 所述螺母螺纹连接于所述调谐螺杆， 并抵靠于所述主盖板。
10、 如权利要求 9所述的 TM模介质滤波器， 其特征在于， 所述主盖板的 中心部位还设有第二凸台， 所述第二凸台沿所述介质谐振器的中轴线突起； 所 述螺纹孔开设在所述第二凸台上， 所述螺母抵靠于所述第二凸台上， 多个所述 弹性瓣的自由端位于所述第二凸台的四周。
11、 如权利要求 10所述的 TM模介质滤波器， 其特征在于， 在所述主盖 板的外表面中心部位设有第一凸台的情况下，所述第二凸台设置在所述第一凸 台上，且所述第二凸台与所述第一凸台连接呈阶梯形， 所述第一凸台的突出面 为环绕在所述第二凸台四周的环形的阶梯面。
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