EP1258941A2 - Filtre ordre minimal avec cavités couplées pour canaux de télévision UHF - Google Patents

Filtre ordre minimal avec cavités couplées pour canaux de télévision UHF Download PDF

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Publication number
EP1258941A2
EP1258941A2 EP02425250A EP02425250A EP1258941A2 EP 1258941 A2 EP1258941 A2 EP 1258941A2 EP 02425250 A EP02425250 A EP 02425250A EP 02425250 A EP02425250 A EP 02425250A EP 1258941 A2 EP1258941 A2 EP 1258941A2
Authority
EP
European Patent Office
Prior art keywords
filter
resonators
coupling
coupled
uhf
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Withdrawn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
EP02425250A
Other languages
German (de)
English (en)
Other versions
EP1258941A3 (fr
Inventor
Daniele Valenti
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.)
COM-TECH Srl
Original Assignee
Comtech 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 Comtech SRL filed Critical Comtech SRL
Publication of EP1258941A2 publication Critical patent/EP1258941A2/fr
Publication of EP1258941A3 publication Critical patent/EP1258941A3/fr
Withdrawn legal-status Critical Current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
    • 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

  • This invention is a passive radio frequency (RF) filter with coupled cavities specifically conceived for UHF TV broadcasting.
  • RF radio frequency
  • the most commonly used filters are band-pass filters featuring at least six resonance cavities and requiring high quality factor resonators to limit insertion losses.
  • some filter configurations employ four band-pass resonators with two extra resonators acting as band stop.
  • these systems are not completely reliable as regards adjustment and frequency response since they are not based on canonical electrical designs.
  • the EP 1 045 470 A2 Patent describes a generalized filter according to classical configurations, the specific object of the invention being its peculiar capacitive coupling which can be adjusted between resonators 2 and 5.
  • This invention consists of a filter made up of four resonators only, and featuring all the requirements for perfect filtering of a television channel.
  • the main advantages of this invention are a reduction in loss with a given resonator quality factor, a greater mechanical and thermal stability, and a decrease in the size, weight and cost of the device.
  • the filter which is the subject of the invention requires high accuracy and symmetry in the frequency response, and cannot be built by means of present-day techniques.
  • the filter is made up of four cylindrical brass resonators (1) placed in the corresponding square cavities (2). Each resonator features a fixed part (3) and a mobile part (4).
  • the mobile part (4) is driven by means of a small steel rod (5) controlled by a mechanical adjustment device made up of a control clamp (6) placed on steel spacing bars (7).
  • the resonators are cascade-coupled by means of adjustable magnetic loops (8) placed between the cavities.
  • the main electrical section of the filter is uniquely designed in that it has a sign reversal in the mutual coupling of the two middle resonators.
  • the generalized coupling between the first and the fourth resonators is carried out in a dual way by means of the adjustable magnetic loop (12).
  • the end resonators are electrically coupled to the connectors (13) by a highly efficient technique which has been carefully worked out and which employs adjustable probes (14) through connector rotation and locking.
  • the shape of all the parts used for adjustment has been optimized by means of precise calculations and electromagnetic simulations so as to make coupling adjustment as easy as possible, with minimum variations within the design band.
  • Filter thermal stability is ensured by the use of special materials such as INVAR steel, as well as by accurate calculations and simulations aimed at finding out the optimum shapes of the resonance structures.
  • the whole device is held inside a screened case made in sheet-brass.
  • All internal parts of the filter are silver-plated in order to improve its high-frequency characteristics.
  • the filter which is the subject of the invention is particularly innovative as to adjustment simplicity and response quality, thanks to the unique coupling configuration.
  • the electrical design of the invention permits precise adjustment with the generalized response attenuation poles placed at the frequencies of the main interferences, corresponding, in the case of analogue transmissions, to the frequencies of 3 rd Order IMD.
  • global selectivity allowing for a reduction in desirable emissions is ensured, according to all current regulations worldwide.
  • Fig. 4 shows the frequency response of a typical channel adjustment.
  • a second-choice configuration will consist of a six-resonance cavity filter, featuring a cascade-coupled cavity in front of each input coupling.
  • the filter will feature eight resonance cavities characterized by two cascade-coupled cavities in front of each input coupling.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Superheterodyne Receivers (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
EP02425250A 2001-05-18 2002-04-22 Filtre ordre minimal avec cavités couplées pour canaux de télévision UHF Withdrawn EP1258941A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITSO20010002 ITSO20010002A1 (it) 2001-05-18 2001-05-18 Filtro di ordine minimo a cavita' accoppiate per canali televisivi uhf.
ITSO20010002 2001-05-18

Publications (2)

Publication Number Publication Date
EP1258941A2 true EP1258941A2 (fr) 2002-11-20
EP1258941A3 EP1258941A3 (fr) 2003-08-27

Family

ID=11456911

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02425250A Withdrawn EP1258941A3 (fr) 2001-05-18 2002-04-22 Filtre ordre minimal avec cavités couplées pour canaux de télévision UHF

Country Status (2)

Country Link
EP (1) EP1258941A3 (fr)
IT (1) ITSO20010002A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1321997A3 (fr) * 2001-12-21 2003-11-05 Radio Frequency Systems, Inc. Structure de couplage capacitif réglable
JP2007300171A (ja) * 2006-04-27 2007-11-15 Japan Radio Co Ltd 帯域通過フィルタ
CN100364169C (zh) * 2005-11-28 2008-01-23 浙江三维通信股份有限公司 带可调电容耦合结构的腔体滤波器
EP1885017A1 (fr) * 2006-07-24 2008-02-06 Matsushita Electric Industrial Co., Ltd. Filtre passe-bande accordable
EP2077600A1 (fr) * 2007-12-27 2009-07-08 THOMSON Licensing Système de couplage de filtre de cavité
EP2421085A1 (fr) * 2010-08-19 2012-02-22 Alcatel Lucent Filtre pour signaux de fréquence radio
WO2015008150A3 (fr) * 2013-06-25 2015-06-25 Powerwave Technologies S.A.R.L. Agencement de couplage entre résonateurs de filtre à cavité
CN109713414A (zh) * 2019-03-01 2019-05-03 江苏德是和通信科技有限公司 一种有限传输零点位置可调的调频带通滤波器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2325401C3 (de) * 1973-05-18 1985-05-15 Georg Dr.-Ing. 8152 Feldkirchen-Westerham Spinner Koppelanordnung zwischen Hochfrequenzkreisen
NZ248549A (en) * 1993-08-31 1997-01-29 Deltec New Zealand Loop coupler for resonator: rotates to adjust loaded q
US5841330A (en) * 1995-03-23 1998-11-24 Bartley Machines & Manufacturing Series coupled filters where the first filter is a dielectric resonator filter with cross-coupling
DE19623144A1 (de) * 1996-06-10 1997-12-11 Bosch Gmbh Robert Mikrowellenfilter, bestehend aus mehreren Koaxial-Resonatoren

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1321997A3 (fr) * 2001-12-21 2003-11-05 Radio Frequency Systems, Inc. Structure de couplage capacitif réglable
US6836198B2 (en) 2001-12-21 2004-12-28 Radio Frequency Systems, Inc. Adjustable capacitive coupling structure
CN100364169C (zh) * 2005-11-28 2008-01-23 浙江三维通信股份有限公司 带可调电容耦合结构的腔体滤波器
JP2007300171A (ja) * 2006-04-27 2007-11-15 Japan Radio Co Ltd 帯域通過フィルタ
EP1885017A1 (fr) * 2006-07-24 2008-02-06 Matsushita Electric Industrial Co., Ltd. Filtre passe-bande accordable
EP2077600A1 (fr) * 2007-12-27 2009-07-08 THOMSON Licensing Système de couplage de filtre de cavité
US8143973B2 (en) 2007-12-27 2012-03-27 Pl Technologies Ag Cavity filter coupling system
EP2421085A1 (fr) * 2010-08-19 2012-02-22 Alcatel Lucent Filtre pour signaux de fréquence radio
WO2015008150A3 (fr) * 2013-06-25 2015-06-25 Powerwave Technologies S.A.R.L. Agencement de couplage entre résonateurs de filtre à cavité
CN109713414A (zh) * 2019-03-01 2019-05-03 江苏德是和通信科技有限公司 一种有限传输零点位置可调的调频带通滤波器
CN109713414B (zh) * 2019-03-01 2023-11-21 江苏德是和通信科技有限公司 一种有限传输零点位置可调的调频带通滤波器

Also Published As

Publication number Publication date
ITSO20010002A1 (it) 2002-11-18
EP1258941A3 (fr) 2003-08-27

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