EP1903631A1 - Koaxial-Hohlraumresonator - Google Patents

Koaxial-Hohlraumresonator Download PDF

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Publication number
EP1903631A1
EP1903631A1 EP07018585A EP07018585A EP1903631A1 EP 1903631 A1 EP1903631 A1 EP 1903631A1 EP 07018585 A EP07018585 A EP 07018585A EP 07018585 A EP07018585 A EP 07018585A EP 1903631 A1 EP1903631 A1 EP 1903631A1
Authority
EP
European Patent Office
Prior art keywords
head
resonator
resonator element
cavity
stem
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Withdrawn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
EP07018585A
Other languages
English (en)
French (fr)
Inventor
Gianpietro Villa
Vittorio Tansini
Mario Bandera
Giampietro Magni
Fabio Tansini
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.)
Kathrein SE
Original Assignee
Kathrein Werke KG
MT Srl
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 Kathrein Werke KG, MT Srl filed Critical Kathrein Werke KG
Publication of EP1903631A1 publication Critical patent/EP1903631A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/06—Cavity resonators

Definitions

  • coaxial cavity resonator to be used over a frequency range from 10 MHz to 4 GHz.
  • Coaxial cavity resonators are widely used in telecommunications, e.g. in the fabrication of passive filters or oscillators.
  • resonator elements generally of cylindrical shape, within a resonant cavity.
  • mushroom-shaped resonator elements are known, i.e. having a mushroom head possibly of electrically conductive material.
  • the electric field is concentrated between the resonator head and the cavity cover.
  • the resonators so formed have limits in terms of size reduction while maintaining maximum CW (continuous wave) and PEP (peak envelope) powers.
  • the purpose of the present inventors is to find a solution to at least some of prior art drawbacks and particularly the problems as set out hereinbefore.
  • a resonator element head as defined in claim 1, by a resonating element as defined in claim 6 and by a coaxial resonator as defined in claim 10.
  • Figures 1 and 2 show a head 52 of a resonator element for a coaxial cavity resonator.
  • the head 52 is made of an electrically conductive material (such as aluminum, brass and is preferably silver-plated) and has an outer lateral surface 521, a top side 522 and a bottom side 523.
  • an electrically conductive material such as aluminum, brass and is preferably silver-plated
  • the head 52 defines by its shape at least one open cavity 8, formed in the bottom side 523, i.e. the side that is designed to face towards the bottom of the resonant cavity.
  • the transverse dimension of the head 52 is inversely proportional to the operating frequency.
  • the open cavity 8 has a substantially and/or generally annular conformation.
  • the head 52 may be mounted in a resonant cavity 3, such as the one as shown in Figure 3, that already has a stem or support 51 integral with the bottom of the resonant cavity.
  • Figure 3 shows a body 2 having a resonant cavity 3 with the stem 51 being part of the body 2, this design shall be apparently intended without limitation.
  • the stem 51 may also be a component separate from the body 2 joined thereto by mechanical coupling, welding, gluing or else.
  • the diameter of the stem 51 is directly proportional to the resonance frequency, i.e. the smaller the diameter the lower the resonance frequency.
  • the transverse dimension of the stem 51 is dependent on the transverse dimension of the head 52.
  • the head 52 and the stem 51 which are electrically connected to each other, form a resonator element 5.
  • the outer lateral surface 521 is higher than traditional heads, and the annular cavity 8 can be formed thereby.
  • the height of the outer lateral surface 521 is inversely proportional to the resonance frequency (the greater the height the lower the resonance frequency) and inversely proportional to the quality or Q factor.
  • the cavity 8 on the bottom side 523 of the head 52 of the resonator 5 and the outer surface 521 allow the operating power to be increased.
  • the presence of the cavity 8 and the outer surface 521 allow the size of the resonator element 5 and the resonant cavity 3 to be minimized with the quality or Q factor being substantially unaltered.
  • the top surface 522 of the head 52 of the resonator element 5 is substantially and/or generally flat and parallel to the cover 4.
  • the lateral surface 521 may have a larger area than the top surface 522.
  • the total coupling of the resonator 5 in the cavity 3 is further increased, thanks to the prevalent addition (unlike traditional solutions) of the coupling with the walls of the resonant cavity 3 to the coupling with the cover 4 only.
  • a resonator element 5 is provided, that has a head 52 with a stem 51 joined thereto.
  • the free end of the stem 51 may be equipped with fastener means 512 such as a threaded blind hole.
  • the free end of the stem 51 may be secured to the bottom of the resonant cavity by other means, such as by welding or gluing.
  • the head 52 is usually joined to the stem 51 in a coaxial position.
  • the head 52 has a tubular portion 524 with a portion of the stem 51 therein.
  • the head 52 of the resonator has a blind hole 12 at the top side 522, which is designed to receive a tuning screw 11 for fine resonance frequency adjustment.
  • Figure 6 shows a coaxial cavity resonator 1 comprising an electrically conductive body 2 (e.g. made of aluminum or brass of preferably of a silver-plated material) with at least one resonant cavity 3 therein.
  • an electrically conductive body 2 e.g. made of aluminum or brass of preferably of a silver-plated material
  • the resonant cavity 3 has an opening 31 and a bottom 32.
  • a cover 4 of electrically conductive material (such as aluminum or brass and preferably of a silver-plated material) is further provided for closing the opening of the resonant cavity 3.
  • At least one resonator element 5 of an electrically conductive material is held in the resonant cavity 3, and is mechanically and electrically joined to the bottom 32 of the resonant cavity 3.
  • the resonator element 5 has a stem 51, which extends axially along an axis X, and has an end 522 secured to the bottom 32 of the resonant cavity 3.
  • the resonator element 5 further has a head 52 attached to the stem 51, which has an outer lateral surface 521, a top side 522 opposite to the stem 51 and a bottom side 523.
  • the head 52 defines by its shape at least one cavity 8 facing towards the bottom 32 of the resonant cavity 3.
  • the cavity 8 has a substantially and/or generally annular extension around the axis of extension X.
  • the head 52 has a tubular portion 524 (of cylindrical or prismatic shape) with a portion of the stem 51 therein.
  • the resonator 1 further has means 11, 12 for fine adjustment of the resonance frequency of the resonator element 5.
  • the means 11, 12 for adjusting the resonance frequency of the resonator element 5 include a screw 11 passing through the cover 4, having a free end to be fitted in a blind hole 12 formed on the top side 522 of the head 52.
  • the present resonator may be used over a frequency range from 10 MHz to 4 GHz, e.g. in the fabrication of filters, duplexers, multiplexers.
  • the electric field concentrates in the space between the outer lateral surface 521 of the head 52 of the resonator 5 and the inner walls of the resonant cavity 3 of the body 2.
  • the low electric field on the head of the resonator causes the influence of the cover 4 on the resonant cavity 3 to be dramatically reduced, wherefore the resonant cavity 3 shall no longer be silver plated (thereby affording a considerable cost reduction).
  • Silver plating is also not required on the resonator head 52, due to its poor contribution to the Q factor.
  • the magnetic field concentrates in the stem 51.

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  • Control Of Motors That Do Not Use Commutators (AREA)
EP07018585A 2006-09-22 2007-09-21 Koaxial-Hohlraumresonator Withdrawn EP1903631A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20061803 ITMI20061803A1 (it) 2006-09-22 2006-09-22 Risonatore a cavita' coassiale

Publications (1)

Publication Number Publication Date
EP1903631A1 true EP1903631A1 (de) 2008-03-26

Family

ID=38669671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07018585A Withdrawn EP1903631A1 (de) 2006-09-22 2007-09-21 Koaxial-Hohlraumresonator

Country Status (2)

Country Link
EP (1) EP1903631A1 (de)
IT (1) ITMI20061803A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2337149A1 (de) * 2009-12-16 2011-06-22 Alcatel Lucent Hohlraumresonator
CN102608431A (zh) * 2012-03-12 2012-07-25 浙江大学 1GHz～8GHz同轴线-介质圆波导谐振腔及介电参数测试方法
CN102623778A (zh) * 2012-03-20 2012-08-01 中国计量学院 双层公用端口腔体合路器
KR20160004564A (ko) * 2014-07-03 2016-01-13 장익수 Pim을 최소화하는 공진기 및 이를 이용한 공진기 필터
KR20160034747A (ko) * 2014-09-22 2016-03-30 주식회사 필트론 Pim을 최소화하고 아크 발생을 방지하는 공진기 및 공진기 필터
US10644376B2 (en) 2014-02-13 2020-05-05 Kathrein-Werke Kg High-frequency filter having a coaxial structure
CN112563703A (zh) * 2020-12-31 2021-03-26 苏州波发特电子科技有限公司 一种5g滤波器的谐振杆装配结构
WO2023221596A1 (zh) * 2022-05-18 2023-11-23 深圳麦时科技有限公司 气溶胶产生装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3480889A (en) * 1966-07-25 1969-11-25 Patelhold Patentverwertung Temperature stabilized cavity resonator
US4437076A (en) * 1981-02-17 1984-03-13 Matsushita Electric Industrial Co., Ltd. Coaxial filter having a plurality of resonators each having a bottomed cylinder
EP0660437A1 (de) * 1993-12-24 1995-06-28 Matsushita Electric Industrial Co., Ltd. Dielektrischer koaxialer Resonator
WO2000002285A1 (en) * 1998-07-01 2000-01-13 Telefonaktiebolaget Lm Ericsson (Publ) A cavity resonator
WO2000013256A2 (en) * 1998-08-26 2000-03-09 Allgon Ab Coaxial cavity resonator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3480889A (en) * 1966-07-25 1969-11-25 Patelhold Patentverwertung Temperature stabilized cavity resonator
US4437076A (en) * 1981-02-17 1984-03-13 Matsushita Electric Industrial Co., Ltd. Coaxial filter having a plurality of resonators each having a bottomed cylinder
EP0660437A1 (de) * 1993-12-24 1995-06-28 Matsushita Electric Industrial Co., Ltd. Dielektrischer koaxialer Resonator
WO2000002285A1 (en) * 1998-07-01 2000-01-13 Telefonaktiebolaget Lm Ericsson (Publ) A cavity resonator
WO2000013256A2 (en) * 1998-08-26 2000-03-09 Allgon Ab Coaxial cavity resonator

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2337149A1 (de) * 2009-12-16 2011-06-22 Alcatel Lucent Hohlraumresonator
CN102608431A (zh) * 2012-03-12 2012-07-25 浙江大学 1GHz～8GHz同轴线-介质圆波导谐振腔及介电参数测试方法
CN102608431B (zh) * 2012-03-12 2014-01-29 浙江大学 1GHz～8GHz同轴线-介质圆波导谐振腔及介电参数测试方法
CN102623778A (zh) * 2012-03-20 2012-08-01 中国计量学院 双层公用端口腔体合路器
US10644376B2 (en) 2014-02-13 2020-05-05 Kathrein-Werke Kg High-frequency filter having a coaxial structure
KR20160004564A (ko) * 2014-07-03 2016-01-13 장익수 Pim을 최소화하는 공진기 및 이를 이용한 공진기 필터
KR20160034747A (ko) * 2014-09-22 2016-03-30 주식회사 필트론 Pim을 최소화하고 아크 발생을 방지하는 공진기 및 공진기 필터
CN112563703A (zh) * 2020-12-31 2021-03-26 苏州波发特电子科技有限公司 一种5g滤波器的谐振杆装配结构
WO2023221596A1 (zh) * 2022-05-18 2023-11-23 深圳麦时科技有限公司 气溶胶产生装置

Also Published As

Publication number Publication date
ITMI20061803A1 (it) 2008-03-23

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