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WO2007013740A1 - Filtre couple par des plaques conductrices possedant une surface incurvee - Google Patents

Filtre couple par des plaques conductrices possedant une surface incurvee Download PDF

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Publication number
WO2007013740A1
WO2007013740A1 PCT/KR2006/002457 KR2006002457W WO2007013740A1 WO 2007013740 A1 WO2007013740 A1 WO 2007013740A1 KR 2006002457 W KR2006002457 W KR 2006002457W WO 2007013740 A1 WO2007013740 A1 WO 2007013740A1
Authority
WO
WIPO (PCT)
Prior art keywords
input
output
filter
resonator
coupling
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.)
Ceased
Application number
PCT/KR2006/002457
Other languages
English (en)
Inventor
Man-Seok Uhm
Ju-Seop Lee
So-Hyeun Yun
In-Bok Yom
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.)
Electronics and Telecommunications Research Institute ETRI
Original Assignee
Electronics and Telecommunications Research Institute ETRI
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
Priority claimed from KR1020050123773A external-priority patent/KR100703719B1/ko
Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Priority to US11/996,770 priority Critical patent/US7796000B2/en
Publication of WO2007013740A1 publication Critical patent/WO2007013740A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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

Definitions

  • the present invention relates to a resonator filter using conductive plates having a curved surface; and more particularly, to a resonator filter using conductive plates having a curved surface as an input/output connecting member by disposing conductive plates having a curved surface shaped similar to a resonator at an input or/ and an output, connecting the conductive plates with the curved surface to an inside conductive probe (a core probe of a coaxial connector) of an input connector and/or an output connector to increase a coupling amount of an input and/or an output and arranging a supplementary conductive member above the conductive plate to finely tune the coupling amount.
  • a comb-line filter is used as an example to describe a resonator filter coupled with conductive plates having a curved surface according to the present invention because the present invention will be well-adapted to a filter such as the comb-line filter or an interdigital filter.
  • the present invention is not limited by the comb-line filter.
  • Such a narrow band filter must have a high frequency selectivity to effectively use the available frequency resource. Therefore, the narrow band filter is developed as a high order filter.
  • the narrow band filter must also have a function of eliminating an unwanted adjacent harmonic frequency band signal except for the signal in pass-band. Since the comb-line filter satisfies the above mentioned characteristics of the narrow band filter, the comb-line filter is widely and commonly used as constitution parts for a wireless communication system.
  • the comb-line filter according to the related art will be described with reference to Fig. 1 hereinafter.
  • FIG. 1 is a perspective view of a comb-line filter having resonators connected to an input/output connector in accordance with the conventional art.
  • the conventional comb-line filter includes an input/output coaxial connector 12 for inputting or outputting a signal; a plurality of resonators 13 for resonating; and a housing 11 for housing the comb-line filter.
  • the conventional comb-line filter generally includes the conductive resonators 13 made of good conductors and the conductive resonators 13 are connected to a shorting part in side by side. Because the comb-line filter is smaller than other type of filters having transmission lines, it is possible to avoid the un-wanted harmonic signal in adjacent harmonic frequency band.
  • the comb-line filter includes the resonators shaped like a rod in the housing 11 and the input/output unit 12 is made of a coaxial connector.
  • the input unit 12 is connected to a first resonator and the output unit 12 is connected to a last resonator.
  • the resonators 13 are electrically coupled one another through iris (inductive coupling) or probe (capacitive coupling).
  • the first conventional technology proposes to use a dielectric material instead of using an air layer in order to reduce a volume of the comb-line filter that controls the coupling amount by an air space between resonators as shown in FIG. 1. That is, rod shaped holes are formed at a dielectric box, and the hole are filled with dielectric material. The resonators are coupled through a thin conductive strip formed on the dielectric box.
  • the adjustable coupling amount is limited by the size of the strip and the space.
  • Such a limitation of designing the filter requests numerous trials and errors to develop a filter part satisfying a target specification. If stringent specifications are required, it is very difficult to manufacture the part to satisfy the specifications. Therefore, it requires to add a functional part to modify or to control the coupling amount after the manufacturing the filter.
  • the narrow gap is generally required to obtain a required coupling amount between the resonators. That is, the filter with the iris has shorter length than a filter without the iris. Therefore, the comb-line filter for the microwave band-pass filter is generally designed to have iris between the resonators. However, it requires a fine manufacturing process since a size of the iris influences the electrical performance significantly. Also, the manufactured iris cannot be replaced.
  • the second conventional technology gives advantages in manufacturing the housing, it is difficult to replace the probe manually. Also, it is impossible to finely tune after manufacturing because the iris coupling uses a tuning screw to fine tune.
  • the intellectual wireless communication system processes various frequency bands and communication schemes. Such an intellectual wireless communication system must have a function of communicating with other system in a selected frequency. Therefore, the intellectual wireless communication system requires a filter that tunes a center frequency.
  • a third conventional technology was introduced in US Patent Publication No. 210109, entitled "Electrically tunable comb-line filters tuned by tunable dielectric capacitors".
  • a variable dielectric capacitor is coupled to the resonators in the comb-line filter.
  • the variable dielectric capacitor controls a capacitance value by controlling voltage. That is, the resonance frequency is electrically controlled by changing the capacitance value through voltage, which was controlled using a tuning screw.
  • the third conventional technology is distinguished from the present invention because the third conventional technology relates to changing of the resonance frequency and the present invention related to changing of input/output coupling amount. That is, the third conventional technology allows the resonator to change a center frequency using the variable dielectric capacitor. On the contrary, the present invention increases the coupling amount using a support member having curved surfaces similar to the resonator and controls the coupling amount by additionally forming a portion on the support member.
  • the first, the second and the third conventional technologies relates to a coupling between resonators, miniaturization and electric-control of resonance frequency in a conventional comb-line filter.
  • the input unit and the output unit are directly connected to the resonators and the resonators are separated from one another using a probe supporting member according to the conventional art.
  • a filter must provide a center frequency and a bandwidth identical to a designing value in order to develop the filter satisfying strict performance specifications.
  • a dielectric or a conductive plate was used to control the coupling amount as a supplementary coupling device.
  • an object of the present invention to provide a resonator filter using conductive plates having a curved surface as an input/output connecting member by disposing conductive plates having a curved surface shaped similar to a resonator at an input or/and an output, connecting the conductive plates with the curved surface to an inside conductive probe (a core probe of a coaxial connector) of an input connector and/or an output connector to increase a coupling amount of an input and/or an output.
  • a resonator filter including: a plurality of resonators for resonating; input and output coaxial connectors; an input/output supporting means formed between the input coaxial connector and one of the resonators and/or between an output supporting means formed between the output coaxial connector and other resonator for electrically and mechanically supporting the input/output coupling; and a connecting means for connecting the input/output supporting means and the input/output coaxial connector, wherein the input/output supporting means is a conductive plate with a curved surface having a center axis similar to the resonators.
  • the resonator filter may further include a coupling means to be controlled above the input/output supporting means to control an input/output coupling amount.
  • the resonator filter may further include a tuning screw above the resonators to tune a resonant frequency and frequency response characteristic.
  • an input/output coupling structure of a comb-line filter is modified according to the present invention to have a wide bandwidth characteristic and to effectively control an input/output coupling amount.
  • a conductive plate with a curved surface similar or identical to a center axis of a rod shaped resonator is disposed front of a first (and/or a last) resonator in a comb-line filter and the conductive plate is connected to a pin of an input( and/or an output) coaxial connector.
  • Such a coupling structure makes the input/output connector to be mechanically stable compared to a conventional coupling structure that directly connects an input/output connector to a resonator.
  • the coupling structure increases the electrical coupling amount of the input/output unit and allows controlling of coupling amount by additionally connecting a supplementary conductive member to the conductive plate.
  • the filter using the conductive plate according to the present invention increase the coupling amount compared to a filter using a probe or a flat conductive plate by disposing the conductive plate with a curved surface having a predetermined length of arc identical or similar to a resonator front (and/or back) of a resonator, connecting an input/output unit to the resonator through the conductive plate. Also, the filter using the conductive plate according to the present invention has more stable mechanical coupling structure since the input/output connector is connected to the conductive plate in order to be electrically connected to the resonator. Also, the supplementary conductive member is coupled on the conductive plate to control the coupling amount.
  • a resonator filter according to the present invention includes conductive plates having a curved surface that connect a resonator and an input connector and an output connector to control the coupling amount thereof and to maintain a stable coupling structure, mechanically.
  • the resonator filter according to the present invention also includes a coupling controlling conductive member to finely control the coupling amount. Therefore, the resonator filter made of conductive material can be developed to satisfy strict performance specifications according to the present invention.
  • FIG. 1 is a perspective view of a comb-line filter having resonators coupled with an input/output connector in accordance with the conventional art
  • FIG. 2 is a perspective view of a resonator filter having conductive plates having a curved surface in accordance with a preferred embodiment of the present invention
  • FIG. 3 is a view showing a resonator filter using conductive plates having a curved surface to connect an input connector and an output connector to resonator in accordance with a preferred embodiment of the present invention
  • Fig. 4 is a graph showing coupling amounts of a filter using conductive plates having a curved surface and a filter without conductive plates.
  • FIG. 5 is a graph showing variation of coupling amount when a coupling controlling conductive member is disposed in a resonator filter having conductive plates having a curved surface in accordance with a preferred embodiment of the present invention. Best Mode for Carrying Out the Invention
  • FIG. 2 is a perspective view of a resonator filter having conductive plates having a curved surface in accordance with a preferred embodiment of the present invention.
  • the resonator filter according to the present invention may be a comb line filter or an interdigitial filter having conductive plates 22 with a curved surface or a rod shaped conductive plates 22, which is connected to a resonator 13 and surrounded by air or dielectric material.
  • the resonator filter according to the present invention has a core probe
  • the filter according to the present invention provides wide bandwidth characteristics and controls an input/output coupling amount.
  • the resonator filter includes: a plurality of resonators 13 each having a shape of a rod; an input coaxial connector 12 and an output coaxial connector 12, conductive plates 22 with a curved surface disposed between the input coaxial connector 12 and a first resonators 13 and between the output coaxial connector 12 and a last resonator 13 for electrically and me- chanically supporting an input coupling and an output coupling; a core probe 21 for connecting the conductive plates 22 and the input coaxial connector 21 and/or the output coaxial connector 12.
  • the resonator filter according to the present invention further includes a coupling controlling conductive member 23 formed on the conductive plate 22 to control an input/output coupling amount. Furthermore, the resonator filter according to the present embodiment further includes a tuning screw 31 to finely tune a resonant frequency and a response characteristic as shown in Fig. 3.
  • the conductive plate 22 with a curved surface is an input and/or output coupling conductive plates having a shape of a rod.
  • the conductive plate 22 is directly connected to the core probe 21 of the input coaxial connector 12 and/or the output coaxial connector 12, has a length same or similar to the center axis of the resonators 13 and has a predetermined arc.
  • the conductive plate 22 connects the input/output unit to the resonator to mechanically stable the input/output units and to increase the electrical coupling amount in the input/output units compared to the input/output unit directly connected to the resonator.
  • the coupling controlling conductive member 23 and the conductive plate 22 are joined together using adhesive such as epoxy or a bolt.
  • the tuning screw 31 shown in Fig. 3 controls the resonant frequency of the electric filter. That is, the parallel capacitance value which denotes the coupling amount can be controlled according to a distance between the tuning screw and the resonator. As a result, a manufacturing error and a designing error can be corrected.
  • FIG. 3 is a view showing a resonator filter using conductive plates having a curved s urface to connect an input connector and an output connector to resonator in accordance with a preferred embodiment of the present invention.
  • the filter according to the present invention has the input/output coupling structure configured of the input/output coaxial connectors 12, the core probe 21, the conductive plates 22 with the curved surface or the rod shaped, the coupling controlling conductive member 23, the first resonator or the last resonator 13 and the tuning screw 31.
  • the coupling amount and the resonant frequency are decided according to the group delay characteristics of the obtained reflection coefficient. That is, the greatest value of the group delay characteristics of the reflection coefficient becomes the resonant frequency and the value thereof denote the coupling amount. Since the value thereof is in reverse proportional to the coupling amount, the greater value denotes smaller coupling amount. On contrary, the smaller value denotes the larger coupling amount.
  • Fig. 4 is a graph showing coupling amounts of a filter using conductive plates having a curved surface and a filter without conductive plates.
  • Fig. 4 shows the group delay values obtained from the filter having the conductive plate with the curved surface according to the present invention and another filter without the conductive plate with respect to the width (W).
  • the filter with the conductive plate having the similar shape of the resonator provides greater coupling amount compared to the filter without the conductive plate. Also, the variation amount is also greater so it is convenience to use such characteristics to control the coupling amount.
  • FIG. 5 is a graph showing variation of coupling amount when a coupling controlling conductive member is disposed in a resonant filter having conductive plates having a curved surface in accordance with a preferred embodiment of the present invention.
  • FIG. 5 shows coupling amount variation when the coupling conductive member to be controlled is disposed on the conductive plates. As shown in Fig. 5, the coupling amount is varied according to the height of the coupling controlling member putted on the conductive plate.
  • the coupling controlling conductive member and the conductive plate are coupled through the adhesive such as the epoxy or the bolt.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

L'invention concerne un filtre de résonateur mettant en oeuvre des plaques conductrices possédant une surface incurvée pour connecter un connecteur coaxial d'entrée/sortie à un résonateur. Ce filtre de résonateur comprend plusieurs résonateurs pour résonance, un connecteur coaxial d'entrée/sortie, une unité de support d'entrée/sortie formée entre le connecteur coaxial d'entrée et l'un des résonateurs et/ou entre une unité de support de sortie formée entre le connecteur coaxial de sortie et un autre résonateur pour supporter électriquement et mécaniquement l'accouplement d'entrée/sortie et une unité de connexion pour connecter l'unité de support d'entrée/sortie et le connecteur coaxial d'entrée/sortie, cette unité de support d'entrée/sortie étant une plaque conductrice avec une surface incurvée possédant un axe central similaire aux résonateurs.
PCT/KR2006/002457 2005-07-26 2006-06-26 Filtre couple par des plaques conductrices possedant une surface incurvee Ceased WO2007013740A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/996,770 US7796000B2 (en) 2005-07-26 2006-06-26 Filter coupled by conductive plates having curved surface

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20050068011 2005-07-26
KR10-2005-0068011 2005-07-26
KR10-2005-0123773 2005-12-15
KR1020050123773A KR100703719B1 (ko) 2005-07-26 2005-12-15 곡면형 도체판으로 결합된 공진기 필터

Publications (1)

Publication Number Publication Date
WO2007013740A1 true WO2007013740A1 (fr) 2007-02-01

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Application Number Title Priority Date Filing Date
PCT/KR2006/002457 Ceased WO2007013740A1 (fr) 2005-07-26 2006-06-26 Filtre couple par des plaques conductrices possedant une surface incurvee

Country Status (1)

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WO (1) WO2007013740A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009084416A1 (fr) * 2007-12-27 2009-07-09 Nec Corporation Structure de connexion pour module sans fil et appareil sans fil

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05167305A (ja) * 1991-12-12 1993-07-02 Sumitomo Metal Mining Co Ltd 導体製のビスを設けた誘電体帯域通過フィルタ
JP2002299909A (ja) * 2001-03-30 2002-10-11 Nec Corp 共振器のアンテナ結合方式及び結合アンテナ
JP2003110304A (ja) * 2002-09-18 2003-04-11 Matsushita Electric Ind Co Ltd 誘電体フィルタ
JP2003234601A (ja) * 2002-02-06 2003-08-22 Soshin Electric Co Ltd フィルタ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05167305A (ja) * 1991-12-12 1993-07-02 Sumitomo Metal Mining Co Ltd 導体製のビスを設けた誘電体帯域通過フィルタ
JP2002299909A (ja) * 2001-03-30 2002-10-11 Nec Corp 共振器のアンテナ結合方式及び結合アンテナ
JP2003234601A (ja) * 2002-02-06 2003-08-22 Soshin Electric Co Ltd フィルタ
JP2003110304A (ja) * 2002-09-18 2003-04-11 Matsushita Electric Ind Co Ltd 誘電体フィルタ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009084416A1 (fr) * 2007-12-27 2009-07-09 Nec Corporation Structure de connexion pour module sans fil et appareil sans fil

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