US3680012A - Microwave band-pass filter having constant bandwidth as filter is tuned - Google Patents

Microwave band-pass filter having constant bandwidth as filter is tuned Download PDF

Info

Publication number
US3680012A
US3680012A US8315A US3680012DA US3680012A US 3680012 A US3680012 A US 3680012A US 8315 A US8315 A US 8315A US 3680012D A US3680012D A US 3680012DA US 3680012 A US3680012 A US 3680012A
Authority
US
United States
Prior art keywords
filter
cavities
rods
band
free end
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.)
Expired - Lifetime
Application number
US8315A
Other languages
English (en)
Inventor
Jean-Noel Moreau
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Application granted granted Critical
Publication of US3680012A publication Critical patent/US3680012A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure

Definitions

  • a filter comprising a plurality of cavities coupled to each 521 0.5. CI. ..333/73 w, 333/83 other by means of meta] probes, the cavities have respective [51] Int. Cl. .l'l03b 7/10 tuning rods which extend therein and whose crss secfina
  • the present invention relates to microwave band-pass filters and in particular to band-pass filters which can be adjusted through a relatively wide frequency range.
  • band-pass filters for microwaves with cascade-coupled resonant cavities, whose walls are of material of good electrical conductivity and which are the seat of oscillation at respective resonance frequencies, determined by the dimensions of the cavity.
  • the filter band-width should maintain a constant absolute value throughout its range of adjustment.
  • a band-pass filter for microwaves comprising: a plurality of cavities, metal probes extending through the walls common to two adjacent cavities and isolated therefrom, and tuning rods, respectively extending into said cavities, said rods having a dielectric constant which differs from that of the medium bounded by said walls and the cross-section of said tuning rods not being constant over the whole of their length.
  • F IG. 1 is an example of a band-pass filter, shown in section;
  • FIG. 2 is an explanatory diagram
  • FIG. 3 is an example of a control rod used in the band-pass filter of FIG. I in accordance with the present invention.
  • copper cavities I0, ll, 12 and 13, with their control rods 30, 31, 32 and 33 of quartz, are coupled with one another by metal probes l4, l5 and 16 located in respective insulating passages l7, l8 and 19.
  • the terminal cavities l0 and 13 are coupled to the corresponding terminals and 2! by probes 22 and 23 passing through the insulating passages 24 and 25.
  • the dielectric medium in the cavities is air.
  • the four cavity filter thus formed is known per se. It will be observed that for given metal probes, the width of the pass-band of the filter varies with the band-center frequency in accordance with a law which depends upon the diameter of the control rods.
  • the curves 40, 41 and 42 show, as a function of the resonance frequency expressed in Gc/s, and for conventional single diameter control rods whose diameter is of 10, 8 and 6 mm respectively, the variation in the corresponding band-width intervals, AB, expressed in Mc/s, in relation to the minimum band-width, which is used as a common reference for all the three curves.
  • a rod with a section which is not constant throughout the length thereof makes it possible to achieve the desired compensation within a wide frequency range and thus to obtain a constant band-width within this range.
  • each of the tuning rods 30 to 33 comprises three dielectric sections 50, 51 and 52, the diameter of which increases from the free end of the rOd.
  • the uppermost part of the other end of each tuning rod preferably includes a metal screw (not shown) running in a corresponding threaded cylindrical part in a conVentional manner, thus making it possible to vary the depth of penetration of the dielectric rod into the cavity, as indicated by the arrows 35.
  • the free end of such a tuning rod is shown in perspective in FIG. 3, showing the three dielectric sections 50, SI and 52 with different diameters and different lengths DI and D2 in so far as sections 51 and 52 are concerned.
  • the section 50 is fitted into the wall of the cavity in the manner indicated above or in any manner suitable for the vertical displacement thereof.
  • a rod of this kind was made of quartz and the diameters of the parts 50, 51 and 52 were respectively 10, 8 and 6 mm, D being equal to 9 mm and D to 6 mm.
  • a band variation of less than 10 percent was thus obtained in a 4-cavity tunable filter with a tuning range of 7.1 to 7.7 Gc/s.
  • Filters of this kind find application in numerous fields and in particular in transmitter-receiver systems for telecommunication, e.g. in radio links.
  • a band-pass filter for microwaves comprising:

Landscapes

  • Control Of Motors That Do Not Use Commutators (AREA)
US8315A 1969-02-17 1970-02-03 Microwave band-pass filter having constant bandwidth as filter is tuned Expired - Lifetime US3680012A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6903852A FR2032034A5 (enrdf_load_stackoverflow) 1969-02-17 1969-02-17

Publications (1)

Publication Number Publication Date
US3680012A true US3680012A (en) 1972-07-25

Family

ID=9029176

Family Applications (1)

Application Number Title Priority Date Filing Date
US8315A Expired - Lifetime US3680012A (en) 1969-02-17 1970-02-03 Microwave band-pass filter having constant bandwidth as filter is tuned

Country Status (4)

Country Link
US (1) US3680012A (enrdf_load_stackoverflow)
JP (1) JPS4922343B1 (enrdf_load_stackoverflow)
FR (1) FR2032034A5 (enrdf_load_stackoverflow)
GB (1) GB1294974A (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851281A (en) * 1973-06-11 1974-11-26 Raytheon Co Impedance matched waveguide device
JPS58131801A (ja) * 1982-01-31 1983-08-05 Nippon Dengiyou Kosaku Kk 帯域通過ろ波器
US6092924A (en) * 1998-02-10 2000-07-25 Denver Instrument Company Microwave moisture analyzer: apparatus and method
US6247246B1 (en) 1998-05-27 2001-06-19 Denver Instrument Company Microwave moisture analyzer: apparatus and method
US6297715B1 (en) 1999-03-27 2001-10-02 Space Systems/Loral, Inc. General response dual-mode, dielectric resonator loaded cavity filter
US6356171B2 (en) 1999-03-27 2002-03-12 Space Systems/Loral, Inc. Planar general response dual-mode cavity filter
US20030107459A1 (en) * 2001-10-30 2003-06-12 Kazuaki Takahashi Radio frequency module and method for manufacturing the same
US20170237142A1 (en) * 2016-02-12 2017-08-17 Huawei Technologies Canada Co., Ltd. Rod-Switched Tunable Filter
US20170237143A1 (en) * 2016-02-17 2017-08-17 Northrop Grumman Systems Corporation Cavity resonator with thermal compensation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5117756A (ja) * 1974-08-02 1976-02-12 Kubota Ltd Yuatsushitsushikitabankuratsuchi

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3226662A (en) * 1961-01-24 1965-12-28 Int Standard Electric Corp Mechanical frequency control in a klystron tube comprising a directly attached rectangular cavity resonator
US3311839A (en) * 1965-12-16 1967-03-28 Northern Electric Co Compensated tunable cavity with single variable element
US3353122A (en) * 1962-08-24 1967-11-14 Marconi Co Ltd Waveguide filters having adjustable tuning means in narrow wall of waveguide
US3392354A (en) * 1965-12-23 1968-07-09 Sylvania Electric Prod Multiple-diameter smooth-surface waveguide tuning post
US3428918A (en) * 1966-05-26 1969-02-18 Us Army Multiplexer channel units
US3443199A (en) * 1966-12-30 1969-05-06 Microwave Ass Wave frequency multiplier employing a nonlinear device in a band-pass filter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3226662A (en) * 1961-01-24 1965-12-28 Int Standard Electric Corp Mechanical frequency control in a klystron tube comprising a directly attached rectangular cavity resonator
US3353122A (en) * 1962-08-24 1967-11-14 Marconi Co Ltd Waveguide filters having adjustable tuning means in narrow wall of waveguide
US3311839A (en) * 1965-12-16 1967-03-28 Northern Electric Co Compensated tunable cavity with single variable element
US3392354A (en) * 1965-12-23 1968-07-09 Sylvania Electric Prod Multiple-diameter smooth-surface waveguide tuning post
US3428918A (en) * 1966-05-26 1969-02-18 Us Army Multiplexer channel units
US3443199A (en) * 1966-12-30 1969-05-06 Microwave Ass Wave frequency multiplier employing a nonlinear device in a band-pass filter

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851281A (en) * 1973-06-11 1974-11-26 Raytheon Co Impedance matched waveguide device
JPS58131801A (ja) * 1982-01-31 1983-08-05 Nippon Dengiyou Kosaku Kk 帯域通過ろ波器
US6092924A (en) * 1998-02-10 2000-07-25 Denver Instrument Company Microwave moisture analyzer: apparatus and method
US7148455B2 (en) 1998-05-27 2006-12-12 Denver Instrument Company Microwave moisture analyzer: apparatus and method
US6247246B1 (en) 1998-05-27 2001-06-19 Denver Instrument Company Microwave moisture analyzer: apparatus and method
US6297715B1 (en) 1999-03-27 2001-10-02 Space Systems/Loral, Inc. General response dual-mode, dielectric resonator loaded cavity filter
US6356171B2 (en) 1999-03-27 2002-03-12 Space Systems/Loral, Inc. Planar general response dual-mode cavity filter
US20030107459A1 (en) * 2001-10-30 2003-06-12 Kazuaki Takahashi Radio frequency module and method for manufacturing the same
US6791438B2 (en) * 2001-10-30 2004-09-14 Matsushita Electric Industrial Co., Ltd. Radio frequency module and method for manufacturing the same
US20170237142A1 (en) * 2016-02-12 2017-08-17 Huawei Technologies Canada Co., Ltd. Rod-Switched Tunable Filter
US9979063B2 (en) * 2016-02-12 2018-05-22 Huawei Technologies Cananda Co., Ltd. Rod-switched tunable filter
US20170237143A1 (en) * 2016-02-17 2017-08-17 Northrop Grumman Systems Corporation Cavity resonator with thermal compensation
US9865909B2 (en) * 2016-02-17 2018-01-09 Northrop Grumman Systems Corporation Cavity resonator with thermal compensation

Also Published As

Publication number Publication date
FR2032034A5 (enrdf_load_stackoverflow) 1970-11-20
JPS4922343B1 (enrdf_load_stackoverflow) 1974-06-07
GB1294974A (enrdf_load_stackoverflow) 1972-11-01

Similar Documents

Publication Publication Date Title
US2749523A (en) Band pass filters
US3737816A (en) Rectangular cavity resonator and microwave filters built from such resonators
US4268809A (en) Microwave filter having means for capacitive interstage coupling between transmission lines
US4179673A (en) Interdigital filter
US4037182A (en) Microwave tuning device
US4143344A (en) Microwave band-pass filter provided with dielectric resonator
US4216448A (en) Microwave distributed-constant band-pass filter comprising projections adjacent on capacitively coupled resonator rods to open ends thereof
US4138652A (en) Dielectric resonator capable of suppressing spurious mode
EP0574396B1 (en) High-frequency band-pass filter
US4142164A (en) Dielectric resonator of improved type
US3680012A (en) Microwave band-pass filter having constant bandwidth as filter is tuned
US4890079A (en) Di-electric bandpass filter
US4620168A (en) Coaxial type tunable hyperfrequency elimination band filter comprising of dielectric resonators
US3693115A (en) Mechanical tunable bandpass filter
US3691487A (en) Helical resonator type filter
US4837534A (en) Ceramic block filter with bidirectional tuning
US4020428A (en) Stripline interdigital band-pass filter
US3496498A (en) High-frequency filter
US4389624A (en) Dielectric-loaded coaxial resonator with a metal plate for wide frequency adjustments
US4603311A (en) Twin strip resonators and filters constructed from these resonators
US5418509A (en) High frequency comb-like filter
US2694186A (en) Wave filter
US3538463A (en) Microwave filter
US4224587A (en) Comb-line bandpass filter
US3353122A (en) Waveguide filters having adjustable tuning means in narrow wall of waveguide