US3681716A - Tunable microminiaturized microwave filters - Google Patents

Tunable microminiaturized microwave filters Download PDF

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Publication number
US3681716A
US3681716A US46597A US3681716DA US3681716A US 3681716 A US3681716 A US 3681716A US 46597 A US46597 A US 46597A US 3681716D A US3681716D A US 3681716DA US 3681716 A US3681716 A US 3681716A
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Prior art keywords
substrate
magnetic field
face
filter
parts
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US46597A
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English (en)
Inventor
Bernard Chiron
Louis Duffau
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Lignes Telegraphiques et Telephoniques LTT SA
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Lignes Telegraphiques et Telephoniques LTT SA
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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
    • H01P1/215—Frequency-selective devices, e.g. filters using ferromagnetic material

Definitions

  • the present invention concerns strip circuits. It is mainly directed to an improvement of high power tunable filters.
  • high power means powers of a few watts and peak powers of several kilowatts.
  • tunable is meant a filter the cutoff frequency of which can be shifted along a frequency band covering about one octave.
  • the tunable filters according to the invention are made of a conductive pattern of strips operating as a filter and deposited on a substrate made at least partly of an adjustable permeability ferrite material, two plugs connected to the pattern, a continuous conductive backing for said substrate and external means for establishing an adjustable D.C. magnetic field within said ferrite part of said substrate.
  • the filter is a one or multicell pattern according to current practice.
  • One of such well known patterns as described in the above mentioned book consists in three parallel strips for each cell of the filter.
  • the substrate for such strip pattern is wholly or partly made of a ferrite material the permeability of which is sensitive to an external magnetic field.
  • the substrate When the substrate is partly made of ferrite material, the substrate underlaying at least part of the central strip of at least one cell is made of ferrite.
  • the conductive pattern consists of a disk and two diametrally opposed strips, the ferrite underlies the disk shaped conductor.
  • FIGS. 1, 2, 3, 8 and 9 show plan views of filters according to the invention.
  • FIGS. 4 and 10 show cut-views of filters according to the invention.
  • FIG. 5 shows the variation of the permeability of a ferrite material with respect to an external D.C. magnetic field.
  • FIGS. 6 and 7 show the transmission characteristics of a filter according to FIG. 1.
  • FIG. 11 shows the transmission characteristics of the filter of FIGS. 9 and 10.
  • FIG. 1 shows a first embodiment of the filter consisting of three strips 1, 2, 3 coating a homogeneous magnetic material substrate 4. Strips 1 and 3 are the input and output strips of the filter and are connected to coaxial plugs not shown. Their width is selected so as to provide impedance matching with the plugs.
  • the underface of the substrate is entirely coated with a metal sheet which does not appear on the top view.
  • strip 2 The dimensions of strip 2 are chosen according to the above cited mathematical process in order to obtain the filtering characteristic required. External means, not shown on the figure, are provided to establish a DC. magnetic field within the substrate either perpendicular to the plane of the strips or along this plane and parallel to the width of the strips.
  • FIG. 2 shows an embodiment in which the strips 1, 2, 3 are deposited and a composite substrate made of three parts 5, 6 and 7.
  • the central part 6 is made of magnetic material as was the substrate 4 in the preceding embodiment.
  • Parts 5 and 7 are made of a non-magnetic dielectric material with low microwave losses such for instance as alumina.
  • the medium strip 2 lies entirely on part 6 of the substrate.
  • Input and output strip conductors l and 3 are deposited on the dielectric parts of the substrate.
  • the substrate is made of a central part 6' of magnetic material and external parts 5 and 7' are made of dielectric material. As shown, the central part 6' of the substrate is shorter than the central strip 2 of the filter. An external means not shown on the drawing establishes a D.C. magnetic field within the substrate part 6'.
  • the central strip 2 of the filter lies partly on the magnetic material 6' and partly on the dielectric material 5'.
  • the wavelength is related to the permeability of the substrate and will therefore vary when the permeability changes.
  • FIG. 4 shows a sectional view of the above embodiments of the invention along a plane perpendicular to the substrate faces and to the length of the strips in which 2 refers to the section of the central strips, 6 shows the substrate and 10, the continuous metal coating of the underface of the substrate.
  • the housing which usually carries the connecting plugs has not been shown.
  • the external means for establishing the D.C. magnetic field within the substrate is shown as consisting of the two permanent magnets 11 and 11' associated with two electromagnets made of a ferrite core 13 and 13' surrounded by respectively coils l4 and 14'. The two coils are series connected.
  • the D.C. field due to the permanent magnets is selected so as to maintain the resonance frequency at the center of the band.
  • a ferrite shunt l5 closes the magnetic circuit in order to prevent any loss of magnetic energy and stray magnetic fields.
  • FIG. 5 shows the variation of the effective permeability of the commercially available ferrite sold by TRANS-TECH under the type reference G. 1004 with respect to the magnetic field, the measurement being carried at 7 GHz. Between points A and B of the curve, the variation law is monotonic and decreasing with increasing magnetic field value. As is obvious, part CD of the curve could also be used, but for technological reasons, it is obviously preferred to use the lower field part of the curve.
  • FIG. 6 shows the measured resonance curve of a filter according to FIG. I designed with the following data:
  • FIG. 7 shows the variation of the resonance frequency of the above filter with the external magnetic field. As has been measured in the frequency band between 6.5 and 7.5 GHz, the bandwidth and the attenuation remain substantially the unchanged.
  • FIGS. 8 and 9 show two filter designs using microstrip technology.
  • the central conductors 2 and 2 respectively are capacitatively coupled with the external conductors which are designed as impedance matching sections shown respectively at 1 3 and 1 3 Such patterns are well known from the teaching of Matthaei.
  • the substrate is at least partially made of ferromagnetic material in the region which underlies central conductor 2.
  • FIG. 10 shows a cut view of a filter design according to the pattern shown in FIG. 8. The characteristics of this filter are represented in FIG. 11. Insertion loss a (interrupted line) and the central operating frequency (continuous line) are given for different values of D.C. magnetic field.
  • the substrate 4 supports on its upper face the conductive pattern and lies in a casing 22 made of an aluminum alloy which defines with the upper face of the substrate an airfilled cavity.
  • Casing 22 acts as the conductive plane shown at 10 in FIG. 4.
  • Two mild steel wafers 20 and 21 are set in openings of casing 22 so as to concentrate the magnetic field in the vicinity of the central conductor 2 of the conductive pattern.
  • the magnetic field is established by the two permanent magnets 11 and 11' associated with the electromagnets l4 and 14'.
  • Shield 23 made of mild steel concentrates the magnetic field around the circuit.
  • Casing 22 carries two output connectors which have been omitted for the sake of clarity.
  • Permanent magnets 11 and 11' establish within conductor 2 a magnetic field chosen so that the central operating frequency of the filter corresponds to the lower extremity of the band in which the filter is tunable. Additional field due to electromagnets l4 and 14 is added to the permanent magnet field so as to bring the central frequency of the filter to the desired value.
  • Thickness of substrate 4 is 1.0 mm. It is made of a ferrite supplied by Lignes Brassiques et Telephoniques under the trade type number 6307.
  • the magnetic field due to magnets 11 and 11 is 1,800 Oersteds.
  • the maximum value of the magnetic field is 4,000 Oersteds.
  • the tuning range of the filter is 6.2 to 9 Gl-lz as shown in FIG. 11. In this frequency range, insertion loss remains lower than 5 dB.
  • a tunable microwave filter comprising in combination:
  • a composite substrate including a first rectangular dielectric ferromagnetic part and at least one second rectangular dielectric non-ferromagnetic part, said first and second parts being arranged side by side in contact with each other;
  • magnetic shielding means for concentrating said magnetic field within said substrate.
  • a tunable microwave filter according to claim 1 in which said means for establishing an adjustable D.C. magnetic field consists in two permanent magnets located on both sides of said substrate and two electromagnets located on both sides of said substrate serially connected to an adjustable current feed.
  • a tunable microwave filter comprising in combination:
  • a composite substrate including a first part of insulating dielectric non-magnetic material and a tionship being such that Ian (27TI41 tam (271412 VMGQ) A0 i 2 A0 where:
  • M is the wavelength in air of the energy propagating in the filter
  • e is the permittivity of the dielectric of said substrate first part

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US46597A 1969-06-18 1970-06-16 Tunable microminiaturized microwave filters Expired - Lifetime US3681716A (en)

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FR6920290A FR2050584A5 (enrdf_load_stackoverflow) 1969-06-18 1969-06-18

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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3733563A (en) * 1971-12-07 1973-05-15 Mini Of Defense Microstrip circulator wherein related microstrip patterns are disposed on opposing surfaces of dielectric substrate
US4020429A (en) * 1976-02-12 1977-04-26 Motorola, Inc. High power radio frequency tunable circuits
US4169252A (en) * 1978-05-05 1979-09-25 Motorola, Inc. Individually packaged magnetically tunable resonators and method of construction
EP0157216A1 (en) * 1984-03-08 1985-10-09 Sony Corporation Magnetic apparatus
US4590448A (en) * 1985-09-25 1986-05-20 The United States Of America As Represented By The Secretary Of The Navy Tunable microwave filters utilizing a slotted line circuit
FR2604306A1 (fr) * 1986-09-18 1988-03-25 Bardin Jean Claude Dispositif hyperfrequence a accord par materiau ferromagnetique
US5053734A (en) * 1989-03-24 1991-10-01 Hitachi Metals, Ltd. Magnetostatic wave device
DE4033180A1 (de) * 1990-10-19 1992-04-23 Ant Nachrichtentech Abstimmbarer koaxialer hohlraumresonator
DE4122290C1 (enrdf_load_stackoverflow) * 1991-07-05 1992-11-19 Ant Nachrichtentechnik Gmbh, 7150 Backnang, De
EP0986127A3 (en) * 1998-09-11 2001-08-29 Murata Manufacturing Co., Ltd. Nonreciprocal circuit device and its manufacturing method
US6501971B1 (en) * 1996-10-30 2002-12-31 The United States Of America As Represented By The Secretary Of The Navy Magnetic ferrite microwave resonator frequency adjuster and tunable filter
US20040000976A1 (en) * 2002-06-27 2004-01-01 Killen William D. High efficiency resonant line
US20040000972A1 (en) * 2002-06-27 2004-01-01 Killen William D. High efficiency interdigital filters
US20040000971A1 (en) * 2002-06-27 2004-01-01 Killen William D. High efficiency stepped impedance filter
US20040164907A1 (en) * 2003-02-25 2004-08-26 Killen William D. Slot fed microstrip antenna having enhanced slot electromagnetic coupling
US20040189527A1 (en) * 2003-03-31 2004-09-30 Killen William D High efficiency crossed slot microstrip antenna
US20040227687A1 (en) * 2003-05-15 2004-11-18 Delgado Heriberto Jose Passive magnetic radome
US20040239577A1 (en) * 2003-05-30 2004-12-02 Delgado Heriberto Jose Efficient radome structures of variable geometry
US20050007289A1 (en) * 2003-07-07 2005-01-13 Zarro Michael S. Multi-band horn antenna using frequency selective surfaces
US20050052268A1 (en) * 2003-09-05 2005-03-10 Pleskach Michael D. Embedded toroidal inductors
US20050057415A1 (en) * 2003-08-25 2005-03-17 Rawnick James J. Antenna with dynamically variable operating band
US20050057423A1 (en) * 2003-09-03 2005-03-17 Delgado Heriberto J. Active magnetic radome
US20050078048A1 (en) * 2003-10-08 2005-04-14 Delgado Heriberto Jose Feedback and control system for radomes
US20050212642A1 (en) * 2004-03-26 2005-09-29 Harris Corporation Embedded toroidal transformers in ceramic substrates
US20060176139A1 (en) * 2005-02-10 2006-08-10 Harris Corporation Embedded toroidal inductor
EP1376743B1 (en) * 2002-06-27 2006-08-23 Harris Corporation High efficiency low pass filter
US7528686B1 (en) 2007-11-21 2009-05-05 Rockwell Collins, Inc. Tunable filter utilizing a conductive grid

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3355680A (en) * 1965-03-29 1967-11-28 E & M Lab Microwave ferrite devices having particular arrangements for the magnetizing source
US3448409A (en) * 1967-11-24 1969-06-03 Bell Telephone Labor Inc Integrated microwave circulator and filter
US3456213A (en) * 1966-12-19 1969-07-15 Rca Corp Single ground plane junction circulator having dielectric substrate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3355680A (en) * 1965-03-29 1967-11-28 E & M Lab Microwave ferrite devices having particular arrangements for the magnetizing source
US3456213A (en) * 1966-12-19 1969-07-15 Rca Corp Single ground plane junction circulator having dielectric substrate
US3448409A (en) * 1967-11-24 1969-06-03 Bell Telephone Labor Inc Integrated microwave circulator and filter

Cited By (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3733563A (en) * 1971-12-07 1973-05-15 Mini Of Defense Microstrip circulator wherein related microstrip patterns are disposed on opposing surfaces of dielectric substrate
US4020429A (en) * 1976-02-12 1977-04-26 Motorola, Inc. High power radio frequency tunable circuits
US4169252A (en) * 1978-05-05 1979-09-25 Motorola, Inc. Individually packaged magnetically tunable resonators and method of construction
EP0157216A1 (en) * 1984-03-08 1985-10-09 Sony Corporation Magnetic apparatus
US4590448A (en) * 1985-09-25 1986-05-20 The United States Of America As Represented By The Secretary Of The Navy Tunable microwave filters utilizing a slotted line circuit
FR2604306A1 (fr) * 1986-09-18 1988-03-25 Bardin Jean Claude Dispositif hyperfrequence a accord par materiau ferromagnetique
US5053734A (en) * 1989-03-24 1991-10-01 Hitachi Metals, Ltd. Magnetostatic wave device
DE4033180A1 (de) * 1990-10-19 1992-04-23 Ant Nachrichtentech Abstimmbarer koaxialer hohlraumresonator
DE4122290C1 (enrdf_load_stackoverflow) * 1991-07-05 1992-11-19 Ant Nachrichtentechnik Gmbh, 7150 Backnang, De
US5430417A (en) * 1991-07-05 1995-07-04 Aft Advanced Ferrite Technology Gmbh Tunable matching network
US6501971B1 (en) * 1996-10-30 2002-12-31 The United States Of America As Represented By The Secretary Of The Navy Magnetic ferrite microwave resonator frequency adjuster and tunable filter
EP0986127A3 (en) * 1998-09-11 2001-08-29 Murata Manufacturing Co., Ltd. Nonreciprocal circuit device and its manufacturing method
US6472960B1 (en) 1998-09-11 2002-10-29 Murata Manufacturing Co., Ltd. Complex circuit board with an electrode and air gap between dielectric and magnetic substrates
US20040000972A1 (en) * 2002-06-27 2004-01-01 Killen William D. High efficiency interdigital filters
US20040000976A1 (en) * 2002-06-27 2004-01-01 Killen William D. High efficiency resonant line
US20040000971A1 (en) * 2002-06-27 2004-01-01 Killen William D. High efficiency stepped impedance filter
EP1376754A1 (en) * 2002-06-27 2004-01-02 Harris Corporation High efficiency resonant line
EP1376741A1 (en) * 2002-06-27 2004-01-02 Harris Corporation High efficiency interdigital filters
EP1376745A1 (en) * 2002-06-27 2004-01-02 Harris Corporation High efficiency stepped impedance filter
US6750740B2 (en) 2002-06-27 2004-06-15 Harris Corporation High efficiency interdigital filters
US6781486B2 (en) 2002-06-27 2004-08-24 Harris Corporation High efficiency stepped impedance filter
EP1376743B1 (en) * 2002-06-27 2006-08-23 Harris Corporation High efficiency low pass filter
US6963259B2 (en) 2002-06-27 2005-11-08 Harris Corporation High efficiency resonant line
AU2003204648B2 (en) * 2002-06-27 2004-12-02 Harris Corporation High efficiency resonant line
AU2003204881B2 (en) * 2002-06-27 2004-11-25 Harris Corporation High efficiency stepped impedance filter
US20040164907A1 (en) * 2003-02-25 2004-08-26 Killen William D. Slot fed microstrip antenna having enhanced slot electromagnetic coupling
US6982671B2 (en) 2003-02-25 2006-01-03 Harris Corporation Slot fed microstrip antenna having enhanced slot electromagnetic coupling
US20040189527A1 (en) * 2003-03-31 2004-09-30 Killen William D High efficiency crossed slot microstrip antenna
US6995711B2 (en) 2003-03-31 2006-02-07 Harris Corporation High efficiency crossed slot microstrip antenna
US20040227687A1 (en) * 2003-05-15 2004-11-18 Delgado Heriberto Jose Passive magnetic radome
US7006052B2 (en) 2003-05-15 2006-02-28 Harris Corporation Passive magnetic radome
US20040239577A1 (en) * 2003-05-30 2004-12-02 Delgado Heriberto Jose Efficient radome structures of variable geometry
US6975279B2 (en) 2003-05-30 2005-12-13 Harris Foundation Efficient radome structures of variable geometry
US20050007289A1 (en) * 2003-07-07 2005-01-13 Zarro Michael S. Multi-band horn antenna using frequency selective surfaces
US6985118B2 (en) 2003-07-07 2006-01-10 Harris Corporation Multi-band horn antenna using frequency selective surfaces
US6992628B2 (en) 2003-08-25 2006-01-31 Harris Corporation Antenna with dynamically variable operating band
US20050057415A1 (en) * 2003-08-25 2005-03-17 Rawnick James J. Antenna with dynamically variable operating band
US7030834B2 (en) 2003-09-03 2006-04-18 Harris Corporation Active magnetic radome
US20050057423A1 (en) * 2003-09-03 2005-03-17 Delgado Heriberto J. Active magnetic radome
US20050052268A1 (en) * 2003-09-05 2005-03-10 Pleskach Michael D. Embedded toroidal inductors
US6990729B2 (en) 2003-09-05 2006-01-31 Harris Corporation Method for forming an inductor
US20050156698A1 (en) * 2003-09-05 2005-07-21 Harris Corporation Embedded toroidal inductors
US20050229385A1 (en) * 2003-09-05 2005-10-20 Harris Corporation Embedded toroidal inductors
US7253711B2 (en) 2003-09-05 2007-08-07 Harris Corporation Embedded toroidal inductors
US7513031B2 (en) 2003-09-05 2009-04-07 Harris Corporation Method for forming an inductor in a ceramic substrate
US20050078048A1 (en) * 2003-10-08 2005-04-14 Delgado Heriberto Jose Feedback and control system for radomes
US7088308B2 (en) 2003-10-08 2006-08-08 Harris Corporation Feedback and control system for radomes
US20050212642A1 (en) * 2004-03-26 2005-09-29 Harris Corporation Embedded toroidal transformers in ceramic substrates
US7196607B2 (en) 2004-03-26 2007-03-27 Harris Corporation Embedded toroidal transformers in ceramic substrates
US20060176139A1 (en) * 2005-02-10 2006-08-10 Harris Corporation Embedded toroidal inductor
US7158005B2 (en) 2005-02-10 2007-01-02 Harris Corporation Embedded toroidal inductor
US7528686B1 (en) 2007-11-21 2009-05-05 Rockwell Collins, Inc. Tunable filter utilizing a conductive grid

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FR2050584A5 (enrdf_load_stackoverflow) 1971-04-02

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