EP1746681A1 - Filtre en plastique en forme de peigne avec un poteau métallique pour augmenter la dissipation thermique - Google Patents

Filtre en plastique en forme de peigne avec un poteau métallique pour augmenter la dissipation thermique Download PDF

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Publication number
EP1746681A1
EP1746681A1 EP05015764A EP05015764A EP1746681A1 EP 1746681 A1 EP1746681 A1 EP 1746681A1 EP 05015764 A EP05015764 A EP 05015764A EP 05015764 A EP05015764 A EP 05015764A EP 1746681 A1 EP1746681 A1 EP 1746681A1
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EP
European Patent Office
Prior art keywords
base
inner conductor
coaxial resonator
coaxial
resonators
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP05015764A
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German (de)
English (en)
Inventor
Olaf Bartz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to EP05015764A priority Critical patent/EP1746681A1/fr
Priority to PCT/EP2006/005549 priority patent/WO2007009532A1/fr
Publication of EP1746681A1 publication Critical patent/EP1746681A1/fr
Withdrawn legal-status Critical Current

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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
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators

Definitions

  • the present invention relates to a coaxial resonator with a sidewall formed from a plastic material coated with a layer of conductive material, and to a microwave filter comprising a plurality of coupled resonators including at least one such coaxial resonator.
  • the microwave region of the electromagnetic spectrum finds widespread use in various fields of technology. Exemplary applications include wireless communication systems, such as mobile communication and satellite communication systems, as well as navigation and radar technology.
  • the growing number of microwave applications increases the possibility of interference occurring within a system or between different systems. Therefore, the microwave region is divided into a plurality of distinct frequency bands.
  • microwave filters are utilized to perform band-pass and band reject functions during transmission and/or reception. Accordingly, the filters are used to separate the different frequency bands and to discriminate between wanted and unwanted signal frequencies so that the quality of the received and of the transmitted signals is largely governed by the characteristics of the filters. Commonly, the filters have to provide for a small bandwidth and a high filter quality.
  • the coverage area is' divided into a plurality of distinct cells.
  • Each cell is assigned to a base station which comprises a transceiver that has to communicate simultaneously with a plurality of mobile devices located within its cell.
  • This communication has to be handled with minimal interference.
  • base stations and mobile devices communicating based on GSM in the 900 MHz band must be protected from interference signals caused by communications based on GSM in the 1800 MHz band or UMTS.
  • the base stations and mobile devices should not transmit outside their designated frequency band. Therefore, the frequency range utilized for the communications signals associated with the cells is separated from adjacent frequencies by the use of microwave filters in the base station as well as in the mobile devices.
  • the same microwave filters are also used to divide the frequency range into a first frequency band, that is used by the base station to transmit signals to the mobile devices (downlink), and a second frequency band, that is used by the mobile devices to transmit signals to the base station (uplink), in order to isolate the transmitter from the receiver.
  • the filters must have a high attenuation outside their pass-band and a low pass-band insertion loss in order to satisfy efficiency requirements and to preserve system sensitivity.
  • such communication systems require an extremely high frequency selectivity in both the base stations and the mobile devices' which often approaches the theoretical limit.
  • microwave filters include a plurality of resonant sections which are coupled together in various configurations.
  • Each resonant section constitutes a distinct resonator and usually comprises a space contained within a closed or substantially closed conducting surface. Upon suitable external excitation, an oscillating electromagnetic field may be maintained within this space.
  • the resonant sections or individual resonators exhibit marked, resonance effects and are characterized by the respective resonant frequency and band-width.
  • coaxial resonator One particular type of resonator regularly used to build microwave filters is known as coaxial resonator.
  • This resonator structure is short-circuited at one end and open circuited at the other end, i.e. comprises a housing defining a cavity and having a longitudinal axis, and a coaxial inner conductor electrically connected to the housing at only, one end.
  • the housing comprises a base, from which the inner conductor extends upwardly, and a sidewall extending upwardly from the base, and in a certain distance above the open end of the inner conductor, the housing is enclosed by a cover so that a gap exists between one end of the inner conductor and the inner surface of the cover.
  • Such coaxial resonators are also referred to as combline resonators, and can essentially be regarded as a section of coaxial transmission line that is short-circuited at one end and capacitively loaded (open) at the other end.
  • Microwave energy may be coupled into the cavity by a magnetic loop antenna located near the inner conductor at the short-circuited end of the transmission line.
  • the free space between the top of the inner conductor and the cover is referred to as the capacitive gap.
  • the resonant frequency of a coaxial resonator is determined by various factors such as the length of the cavity, the length of the inner conductor and the size of the capacitive gap.
  • a hole may be provided in the cover above the inner conductor, in which hole a tuning screw is placed. Adjusting the tuning screw one can change the capacitive gap and thus control the resonant frequency.
  • the inner conductor may be provided as a partly hollow component and the tuning screw may be arranged to at least partly penetrate this inner conductor.
  • Such a resonator structure is referred to as re-entrant combline resonator.
  • the tuning screw may also be disposed in holes provided in the sidewalls or the base of the housing.
  • the distinct resonators coupled together to form the filter have a predetermined resonant frequency and band width or pass-band.
  • the resonant frequency is largely determined by the size and shape of the resonator structure, the dimensions of a particular resonator have to be thoroughly calculated and the production process has to be carefully controlled.
  • microwave filters from a unitary metallic body including a plurality of recesses forming the resonant sections.
  • a metallic cover plate is secured to the body to close the recesses.
  • the body is formed by die-casting or by milling from a solid piece of metal.
  • microwave filters are relatively expensive to manufacture, and for every filter, large amounts of material are required.
  • a general problem of microwave filters is that they have to be as small and lightweight as possible while simultaneously retaining the desired filter characteristics. This is particularly true for filters utilized in modern mobile communications systems such as base station filters.
  • One solution to overcome the above problems is to construct the filter and its resonant sections from a plastic material which is coated on its interior surface with a conductive material in order to provide the closed or substantially closed conducting surface.
  • This microwave filter consists of a plurality of coupled coaxial resonators.
  • the sidewalls and the bases together with the inner conductors of all coaxial resonators are integrally constructed in one piece by a framework formed from a moldable material, such as plastic, which is plated with a conductive layer.
  • the framework may be produced in a cost-efficient manner by injection molding.
  • the cover of the housing may likewise be formed from a moldable material which is then plated with a conductive layer, or may be formed from a suitable conductive material, such as aluminum. The cover may be secured to the remainder of the housing by snap-fitting.
  • a similar plastic microwave filter consisting of a plurality of coupled coaxial resonators is known from US 3,896,545 .
  • coaxial resonators are subject to thermal expansion and contraction of their housing and other components such as e.g. the inner conductor, which potentially lead to a change in resonant frequency as the temperature varies.
  • plastic materials plated with a conductive layer and used to build the above plastic filters consisting of coupled coaxial resonators have a higher coefficient of thermal expansion than aluminum or other well known materials for this type of filter.
  • plastic materials coated with a conductive layer exhibit a much lower thermal conductivity as compared to the metallic materials alternatively utilized to build microwave filters.
  • the heat generated by the loss of the filter in the inner conductive layer cannot be dissipated efficiently (because of the low thermal conductivity), and gives rise to a substantial increase of the temperature of the conductive layer and eventually the entire housing and inner conductor of the individual coaxial resonators.
  • the increase of temperature of the conductive layer causes extra losses which further heat up the filter.
  • microwave filters constructed from plastic material coated with a conductive layer regularly exhibit insufficient filter performance with significant detuning of the filter caused by a high temperature increase during operation of the filter and thus high thermal expansion. Therefore, the power capability of such filters is reduced. Further, the high temperature induced expansion leads to high mechanical stress which significantly reduces the service life of the filters.
  • the coaxial resonator of the present invention comprises a housing defining a cavity and having a base, a sidewall extending upwardly from the base, and an upper cover. On all surfaces defining the cavity, a conductive material is disposed (i.e. the walls are made of conductive material or are plated with a layer of conductive material).
  • a major portion of the housing, which portion at least includes the sidewall of the housing, is made from a plastic material coated at least on its inside surface, i.e. the surface forming the boundary of the cavity, with a layer of conductive material such as e.g. silver.
  • An inner conductor extends upwardly from the base and is electrically connected to the base.
  • the base and the inner conductor are made from metal or metal material, i.e. they comprise one or more different metals or metal materials and do not comprise plastic material.
  • the invention is based on the finding that the base and the inner conductor are those parts of the coaxial resonator at which the highest current densities occur and at which accordingly the largest amounts of heat are generated during use of the resonator.
  • the construction of the base and the inner conductor of metal material allows for a very efficient dissipation of heat generated during use of the coaxial resonator.
  • the arrangement, according to which the main part of the housing of the resonator including the sidewall is made of plastic material plated with a conductive layer, provides the advantage of low weight and low-cost production, e.g. utilizing injection molding.
  • the coaxial resonator according to the present invention combines the latter advantages with a high frequency stability even during high power applications.
  • coaxial resonators may advantageously be utilized to form a microwave filter including a plurality of coupled resonators.
  • the advantages of the above prior art plastic microwave filters are essentially retained while the performance of the filters for high power applications is substantially increased, with the temperature induced frequency shift or detuning and the losses being reduced. Further, due to a lower degree of expansion mechanical stress is minimized.
  • the weight and size of the coaxial resonators as well as of microwave filters utilizing these coaxial resonators can be reduced by the possibility of using thinner walls. For example, when molding sidewalls from plastic, the wall thickness can be made substantially lower, e.g. lower than 3 mm, as compared to sidewalls constructed from aluminum, which require wall thicknesses of about 5 mm.
  • the plastic components of the coaxial resonator can advantageously be manufactured by injection molding. In particular, it is advantageously possible to use pure plastic materials in order to facilitate injection molding.
  • the base of the coaxial resonator comprises or is made of copper, aluminum, iron, steel, invar or brass, or a combination of these materials.
  • aluminum is preferred for reasons of weight and costs.
  • the base is coated with a conductive layer, such as e.g. silver, at least on the side facing the cavity defined by the housing.
  • the inner conductor comprises or is made of copper, aluminium, iron, steel, invar or brass, or a combination of these materials.
  • aluminum is preferred for reasons of weight and costs.
  • the inner conductor is coated with a conductive layer, such as e.g. silver.
  • preferred metals or metal materials for the construction of the base and the inner conductor have a thermal conductivity of at least 10 W/(m K), preferably at least 200 W/(m K) and most preferably at least 350 W/(m K) at 23 °C. Further, it is preferred if the coefficient of thermal expansion of these metals or metal materials is lower than 25 ⁇ 10 -6 K -1 and preferably lower than 19 ⁇ 10 -6 K -1 at this temperature.
  • the base and the inner conductor can be provided as separate elements which are fixed together, e.g. by means of screws or bolts, by soldering or brazing, by using a suitable adhesive, or by means of mating threads provided on the base and on the inner conductor. It can be advantageous if the inner conductor is releasably attached to the base. In this way, the inner conductor of a coaxial resonator can be replaced with an inner conductor having other dimensions in order to change, if necessary, the resonant frequency of the resonator. Alternatively, the base and the inner conductor are advantageously integrally formed in one piece. The latter construction provides for ease of manufacture and ensures high thermal and electric conductivity between the base and the inner conductor.
  • the base and/or the inner conductor are formed by milling, die-casting, cold extrusion, deep drawing or forming from thin metal. This is particularly advantageous if the base and the inner conductor are integrally formed in one piece. Cold extrusion and deep drawing provide the advantage that the base and/or the inner conductor can be precisely dimensioned while using a low amount of material, and may thus be produced in a particularly cost-efficient manner.
  • the cover similar to the sidewall, is made from a plastic material coated with a conductive layer such as e.g. silver.
  • a conductive layer such as e.g. silver.
  • the cover is formed from metal material.
  • the sidewall is attached to the base by means of screws, clamps, an adhesive or snap-fitting.
  • a releasable connection between the base and the sidewall provides the advantage that the sidewall and/or the base and/or the inner conductor may be replaced with a differently dimensioned component in order to change the resonant frequency of the coaxial resonator.
  • the present invention also relates to a microwave filter comprising a plurality of coupled resonators, wherein the plurality of coupled resonators includes one or several of the above defined coaxial resonators according to the present invention.
  • the plurality of coupled resonators only includes coaxial resonators according to the present invention.
  • the bases of two or more of the coaxial resonators of the invention may be integrally formed in one piece. Such a common base may also integrally include one or more of the inner conductors of the respective coaxial resonators.
  • the sidewalls of two or more of the coaxial resonators of the invention may be integrally formed in one piece.
  • a microwave filter comprising a plurality of coaxial resonators may be produced in a very cost-efficient manner.
  • the connection between these components may be adapted such that it is possible to replace one or both of these components with a differently dimensioned component in order to change the filter characteristics.
  • a microwave filter comprising a plurality of coupled resonators including at least one of the coaxial resonators of the present invention
  • the individual coaxial resonators are formed as separate elements which are mechanically connected to form the filter. It has been realized that the filter characteristics are largely governed by the dimensions of the individual resonators, and that the coupling between these resonators is less critical. Thus, a plurality of resonators, each closely meeting particular specifications, may be mechanically coupled together without impairing the desired filter performance. In this way, a microwave filter with specific filter characteristics may be produced in a very flexible and cost-efficient way.
  • a coaxial resonator 1 is shown in cross section which is to be used in a microwave filter comprising a plurality of coupled resonators.
  • the resonator 1 comprises a hollow housing 2 constituted by a plate shaped base 3, a sidewall 4 extending upwardly from the base 3, and a plate shaped cover 5 secured to the upper end of the sidewall 4.
  • the housing 2 encloses and defines a resonator cavity 1a.
  • the base 3 and the cover 5 may have, e.g., a circular or rectangular shape.
  • the sidewall 4 may have a cylindrical configuration or may have a rectangular cross section.
  • the coaxial resonator 1 further comprises a cylindrical inner conductor 6 centrally connected at its lower end 7 to the base 3 of the housing 2.
  • the inner conductor 6 and the base 3 are integrally formed in one piece.
  • the inner conductor 6 may be attached to the base 3 by means of screws or bolts, by soldering or brazing, by using a suitable adhesive, or by means of mating threads provided on the base 3 and on the inner conductor 6.
  • the inner conductor 6 extends upwardly from the base 3 along the longitudinal axis of the housing 2.
  • the inner conductor 6 has a length which is lower than the length of the housing 2, so that a capacitive gap is formed between the upper end 8 of the inner conductor 6 and the cover 5 of the housing 2.
  • the base 3 and the inner conductor 6 may be formed as a solid element, in the embodiment shown in Figure 1, the base 3 and the inner conductor 6 are formed from sheet metal, e.g. by means of cold extrusion. Thus, the inner conductor 6 is a hollow component. In this way, the weight and the costs of the resonator 1 are reduced.
  • the coaxial resonator 1 further comprises a tuning screw 9 extending through a hole provided in the cover 5 above the inner conductor 6.
  • the tuning screw 9 can be moved into or out of the coaxial resonator 1 in order to change the capacitive gap between the top 8 of the inner conductor 6 and the cover 5, and to thereby adjust the resonant frequency of the resonator 1.
  • the sidewall 4 consists of plastic material 10 which is provided on its inside surface with a conductive coating in the form of a layer 11 of metal material.
  • the cover 5 also consists of plastic material 10 having a conductive coating in the form of a layer 11 of metal material.
  • the conductive layer 11 is provided only on the surface of the cover 5 which is to be disposed in facing relationship with the resonator cavity 1a.
  • the conductive layer 11 is also disposed on the edges and/or the other surface of the cover 11.
  • the conductive layer 11 may also be disposed on surfaces of the sidewall 4 other than the inside surface. While the arrangement shown in Figure 1 is preferred for reasons of weight and costs, it is also possible that the cover 5 is made from metal material. It should be noted, that in Figure 1 the thickness of the layers 11 has been exaggerated for the purpose of illustration.
  • the base 3 and the inner conductor 6 consist of metal material.
  • the base 3 is secured to the lower circumferential edge of the sidewall 4 such that a good electric connection is established between the base 3 and the conductive layer 11 on the inside surface of the sidewall 4.
  • the field in the resonator 1 is excited by an external circuit (not shown) through suitable coupling means (not shown), which may e.g. comprise an aperture or a coupling loop and radiate a wave into the resonator cavity.
  • suitable coupling means may e.g. comprise an aperture or a coupling loop and radiate a wave into the resonator cavity.
  • the highest current densities occur in the region of the base 3 and the inner conductor 6. Due to the fact that these elements are formed from metal material, the heat generated by the electric currents is efficiently dissipated. Therefore, the current induced rise in temperature of the resonator 1 as well as a corresponding change of the dimensions of the resonator 1 is limited. Thus, the resonator 1 yields excellent frequency stability.
  • the weight of the resonator 1 is kept low, because the sidewall 4 and the cover 5, i.e. the major portion of the housing 2, essentially consist of plastic material 10.
  • FIG 2 shows a cross sectional view of a microwave filter 12 comprising four coaxial resonators 1 of the type shown in Figure 1 which are coupled together in series in a linear arrangement.
  • the coaxial resonators 1 forming a microwave filter will be coupled together in a two-dimensional array.
  • each coaxial resonator 1 comprises a hollow housing 2 enclosing and defining a resonator cavity 1a and constituted by a plate shaped base 3, a sidewall 4 extending upwardly from the base 3, and a plate shaped cover 5 secured to the upper end of the sidewall 4.
  • the base 3 and the inner.conductor 6 are made from metal material, and the sidewall 4 as well as the cover 5 are made from plastic material coated with a conductive layer.
  • a perspective view of the microwave filter 12 is shown with the covers 5 of the coaxial resonators 1 removed. It should be noted that in Figures 2 and 3 the conductive layers 11 are not shown for the sake of simplicity.
  • the field in the filter 12 is excited and extracted by means of suitable coupling means 13a and 13b, respectively, which may e.g. comprise an aperture or a coupling loop.
  • the base component 14 consist of metal material and is secured to the lower edges of the sidewall component 16.
  • the cover component 15 and the sidewall component 16 consists of plastic material 10 which is provided at least on the surface facing the resonator cavities 1a with a conductive coating in the form of a layer of metal material (not shown in Figures 2 and 3).
  • the individual coaxial resonators 1 are coupled by three coupling windows 17.
  • One of the coupling windows 17 is provided in the common sidewall section 18 between each two adjacent coaxial resonators 1.
  • the sequence of the resonators 1 between the input coupling 13a and the output coupling 13b constitutes the electromagnetic path of the microwave filter 12.
  • a respective tuning screw 19 is provided which is arranged to extend through a hole in the common cover component 15 into the respective window 17.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP05015764A 2005-07-20 2005-07-20 Filtre en plastique en forme de peigne avec un poteau métallique pour augmenter la dissipation thermique Withdrawn EP1746681A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP05015764A EP1746681A1 (fr) 2005-07-20 2005-07-20 Filtre en plastique en forme de peigne avec un poteau métallique pour augmenter la dissipation thermique
PCT/EP2006/005549 WO2007009532A1 (fr) 2005-07-20 2006-06-09 Filtre de melange en plastique pourvu d'un montant metallique pour l'accroissement de la dissipation thermique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05015764A EP1746681A1 (fr) 2005-07-20 2005-07-20 Filtre en plastique en forme de peigne avec un poteau métallique pour augmenter la dissipation thermique

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EP1746681A1 true EP1746681A1 (fr) 2007-01-24

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WO (1) WO2007009532A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008132422A1 (fr) * 2007-04-30 2008-11-06 Isotek Electronics Limited Résonateur accordable en mode tem à compensation thermique
EP2118957A1 (fr) * 2007-03-12 2009-11-18 Ace Technologies Corp. Procédé de fabrication d'un dispositif rf et dispositif rf fabriqué selon ce procédé
CN101916895A (zh) * 2010-08-20 2010-12-15 深圳市大富科技股份有限公司 腔体滤波器及腔体滤波器制造方法
CN101938025A (zh) * 2010-08-24 2011-01-05 深圳市大富科技股份有限公司 通信设备、腔体滤波器及其盖板
CN101938026A (zh) * 2010-08-24 2011-01-05 深圳市大富科技股份有限公司 通信设备、腔体滤波器及其盖板
WO2013058779A1 (fr) * 2011-10-18 2013-04-25 Prism Microwave, Inc. Procédé de fabrication d'un filtre rf, ainsi que filtre rf
WO2013117074A1 (fr) * 2012-02-08 2013-08-15 武汉凡谷电子技术股份有限公司 Filtre à cavité de puissance haute fréquence en matière plastique
JP2014143517A (ja) * 2013-01-23 2014-08-07 Nippon Hoso Kyokai <Nhk> 高周波フィルタ
WO2014086844A3 (fr) * 2012-12-05 2015-01-08 Cuptronic Technology Ltd. Métallisation de filtres à cavité polymères
CN108123194A (zh) * 2016-11-30 2018-06-05 凯镭思通讯设备（上海）有限公司 一种薄壁拉伸腔体滤波器及制作方法
EP3561948A4 (fr) * 2017-01-13 2019-12-25 Huawei Technologies Co., Ltd. Résonateur à cavité, filtre et dispositif de télécommunication
CN113131114A (zh) * 2019-12-31 2021-07-16 深圳市大富科技股份有限公司 腔体滤波器及其盖板组件以及通信设备

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CN102709629A (zh) * 2012-02-08 2012-10-03 武汉凡谷电子技术股份有限公司 中频段大功率腔体滤波器
CN102544657A (zh) * 2012-02-08 2012-07-04 武汉凡谷电子技术股份有限公司 高频段大功率塑料腔体滤波器
CN102544656A (zh) * 2012-02-08 2012-07-04 武汉凡谷电子技术股份有限公司 腔体滤波器

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EP1391963A1 (fr) * 2002-08-20 2004-02-25 Allen Telecom Inc. Résonateurs et filtres à cavité métallique chargée avec tube diélectrique

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US3896545A (en) 1973-10-12 1975-07-29 Gen Dynamics Corp Method of making a molded waveguide filter with integral tuning posts
US5329687A (en) 1992-10-30 1994-07-19 Teledyne Industries, Inc. Method of forming a filter with integrally formed resonators
US6167739B1 (en) * 1996-08-05 2001-01-02 Adc Solitra Oy Filter and a method for manufacturing a filter
US6335668B1 (en) * 1998-12-18 2002-01-01 Telefonaktiebolaget Lm Ericsson (Publ) Cavity filter
EP1391963A1 (fr) * 2002-08-20 2004-02-25 Allen Telecom Inc. Résonateurs et filtres à cavité métallique chargée avec tube diélectrique

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2118957A1 (fr) * 2007-03-12 2009-11-18 Ace Technologies Corp. Procédé de fabrication d'un dispositif rf et dispositif rf fabriqué selon ce procédé
EP2118957A4 (fr) * 2007-03-12 2010-12-22 Ace tech corp Procédé de fabrication d'un dispositif rf et dispositif rf fabriqué selon ce procédé
US8286327B2 (en) 2007-03-12 2012-10-16 Ace Technologies Corporation Method for manufacturing radio frequency device
CN101636873B (zh) * 2007-03-12 2013-01-02 Ace技术株式会社 制造rf装置的方法及用该方法制造的rf装置
WO2008132422A1 (fr) * 2007-04-30 2008-11-06 Isotek Electronics Limited Résonateur accordable en mode tem à compensation thermique
CN101916895A (zh) * 2010-08-20 2010-12-15 深圳市大富科技股份有限公司 腔体滤波器及腔体滤波器制造方法
CN101938025A (zh) * 2010-08-24 2011-01-05 深圳市大富科技股份有限公司 通信设备、腔体滤波器及其盖板
CN101938026A (zh) * 2010-08-24 2011-01-05 深圳市大富科技股份有限公司 通信设备、腔体滤波器及其盖板
WO2013058779A1 (fr) * 2011-10-18 2013-04-25 Prism Microwave, Inc. Procédé de fabrication d'un filtre rf, ainsi que filtre rf
US9190707B2 (en) 2011-10-18 2015-11-17 Prism Microwave, Inc. Method for manufacturing an RF filter and an RF filter
WO2013117074A1 (fr) * 2012-02-08 2013-08-15 武汉凡谷电子技术股份有限公司 Filtre à cavité de puissance haute fréquence en matière plastique
WO2013117075A1 (fr) * 2012-02-08 2013-08-15 武汉凡谷电子技术股份有限公司 Filtre à cavités multiples pour applications en intérieur
WO2014086844A3 (fr) * 2012-12-05 2015-01-08 Cuptronic Technology Ltd. Métallisation de filtres à cavité polymères
JP2014143517A (ja) * 2013-01-23 2014-08-07 Nippon Hoso Kyokai <Nhk> 高周波フィルタ
CN108123194A (zh) * 2016-11-30 2018-06-05 凯镭思通讯设备（上海）有限公司 一种薄壁拉伸腔体滤波器及制作方法
WO2018098940A1 (fr) * 2016-11-30 2018-06-07 凯镭思通讯设备（上海）有限公司 Filtre à cavité d'étirement à paroi mince et son procédé de fabrication
EP3561948A4 (fr) * 2017-01-13 2019-12-25 Huawei Technologies Co., Ltd. Résonateur à cavité, filtre et dispositif de télécommunication
US10978775B2 (en) 2017-01-13 2021-04-13 Huawei Technologies Co., Ltd. Cavity resonator, filter, and communications device
CN113131114A (zh) * 2019-12-31 2021-07-16 深圳市大富科技股份有限公司 腔体滤波器及其盖板组件以及通信设备

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