US3838367A - Microstrip filter comprising a ferromagnetic resonant body - Google Patents

Microstrip filter comprising a ferromagnetic resonant body Download PDF

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Publication number
US3838367A
US3838367A US00408512A US40851273A US3838367A US 3838367 A US3838367 A US 3838367A US 00408512 A US00408512 A US 00408512A US 40851273 A US40851273 A US 40851273A US 3838367 A US3838367 A US 3838367A
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United States
Prior art keywords
conductors
magnetic
waves
transmission line
frequency
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Expired - Lifetime
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US00408512A
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English (en)
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H Bex
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US Philips Corp
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US Philips Corp
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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
    • H01P1/218—Frequency-selective devices, e.g. filters using ferromagnetic material the ferromagnetic material acting as a frequency selective coupling element, e.g. YIG-filters
    • 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
    • H01P1/203—Strip line filters

Definitions

  • ABSTRACT A YIG crystal filter, notably for use in mixing circuits, by means of which, in addition to a frequency separation, a separation of even and odd waves on a double line can be realized.
  • the transmission properties are substantially improved by interconnecting points of the double line at the area of the YIG crystal by means of a transmission line having a length of one half wavelength related to the magnetic resonant frequency of the YIG crystal,
  • This signal is filtered out by means of a YIG crystal filter. Therefore, the two conductors are symmetrically arranged with respect to the pre-polarized magnetic body such that the magnetic field of the even waves on the transmission line is mainly perpendicular to the prepolarization direction at the area of the body, so that coupling to the precession field takes place, whilst the magnetic field of the odd waves is mainly parallel to the pre-polarization direction, with the result that the coupling is nil or at least insignificant.
  • FIG. 1 is a diagrammatic representation of a double mixing circuit of a known kind in which the filter according to the invention is used.
  • the conductors L3,'L4 are terminated by a detour line L5, the length of which is equal to one half wavelength at the resonant frequency.
  • FIG. 2 also shows lines of force M of the high frequency magnetic field which is generated by even waves on the conductors L3 and L4. These lines of force enclose the two conductors L3 and L4 and are directed mainly perpendicular to the magnetic field H at the area of the sphere Y1. As is known, under these circumstances a precession of the magnetic vector about the direction of the field I-I,, occurs. This precession is maximum if the frequency of the waves corresponds to the magnetic resonant frequency of the medium which is determined by the strength of the field H The even waves, representing the desired intermediate frequency signal of 2,000 MHz, therefore, as strongly magnetically coupled to the sphere Y1.
  • the detour line L5 is absent, with the result that the currents of the even waves in the vicinity of the sphere can be much smaller than the maximum value.
  • the conductors system L3, L4, L5, L6, L7 is arranged, as is shown in the plan view of FIG. 4, on one side of the filter plate.
  • the diameter of the spheres amounts to, for example, 0.8 mm and that of the coupling opening to 4 mm.
  • a conductor system L8, L9, L10, L11, L12, of the same shape as the first system but rotated through with respect thereto, is provided on the other side.
  • FIG. 5 shows a cross-sectional view. Analogous to the FIGS. 2 and 3, the first condutor system is provided on a dielectric carrier D1 and is coupled to the sphere Y1.
  • the spheres Y1 and Y2 are connected to carrier rods H1 and H2 which are inserted into holes in the carriers D1 and D2.
  • the crystal axes of the spheres Y1 and Y2 can be oriented such that the temperature influence is minimum.
  • the spheres are magnetically coupled to each other via the opening K and are tuned to the same frequency. As is known, a band-filter action is thus obtained.
  • the detour line L10 constitutes a short-circuit for the even waves between the conductors L8 and L9 and the earthed intermediate plate A. It is thus prevented that the even waves can proceed on the conductors L11 and L12 to the generator G2, which would lead to losses.
  • the filter can be modified in various manners within the scope of the invention.
  • a single sphere can be used instead of two spheres.
  • the filter is used in a single mixing circuit, it is not necessary for the two crossed transmission lines to consist of two conductors each. In such a case one of the transmission lines can consist of a single conductor like in the known filters.
  • An electric band-pass filter in which a first transmission line is magnetically coupled to a second transmission line, extending perpendicular thereto, by way of at least one body of ferro-magnetic material which is magnetically pre-polarized in the direction perpendicular to the directions of the transmission lines with a strength such that magnetic resonance occurs at the desired band-pass frequency, the first transmission line being formed by two conductors and an earthed return conductor, it being possible for even and odd waves to appear on the said two conductors, the said two conductors being symmetrically arranged with respect to the magnetic body such that the magnetic field of the

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Superheterodyne Receivers (AREA)
US00408512A 1972-11-04 1973-10-23 Microstrip filter comprising a ferromagnetic resonant body Expired - Lifetime US3838367A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7214941A NL7214941A (fr) 1972-11-04 1972-11-04

Publications (1)

Publication Number Publication Date
US3838367A true US3838367A (en) 1974-09-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00408512A Expired - Lifetime US3838367A (en) 1972-11-04 1973-10-23 Microstrip filter comprising a ferromagnetic resonant body

Country Status (7)

Country Link
US (1) US3838367A (fr)
JP (1) JPS5244694B2 (fr)
CA (1) CA1002129A (fr)
FR (1) FR2205753B1 (fr)
GB (1) GB1448254A (fr)
IT (1) IT1001616B (fr)
NL (1) NL7214941A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939429A (en) * 1973-07-07 1976-02-17 U.S. Philips Corporation Tunable high frequency input circuit for a television receiver that tunes both VHF and UHF channels and can be readily integrated
US4169253A (en) * 1978-05-08 1979-09-25 Loral Corporation Frequency offset technique for YIG devices
US4292357A (en) * 1979-07-25 1981-09-29 Eagle-Picher Industries, Inc. Zinc/zinc oxide laminated anode assembly
US4521753A (en) * 1982-12-03 1985-06-04 Raytheon Company Tuned resonant circuit utilizing a ferromagnetically coupled interstage line
US4543543A (en) * 1982-12-03 1985-09-24 Raytheon Company Magnetically tuned resonant circuit
US4600906A (en) * 1982-12-03 1986-07-15 Raytheon Company Magnetically tuned resonant circuit wherein magnetic field is provided by a biased conductor on the circuit support structure
US4609892A (en) * 1985-09-30 1986-09-02 Motorola, Inc. Stripline filter apparatus and method of making the same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973204A (en) * 1975-02-25 1976-08-03 Hewlett-Packard Company YIG tuned mixer
GB2131627B (en) * 1982-12-03 1987-08-26 Raytheon Co A magnetically tuned resonant circuit
JPH02134154A (ja) * 1988-11-15 1990-05-23 Yuzo Sugiura 灸用もぐさの成形器具

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3560884A (en) * 1969-04-16 1971-02-02 Westinghouse Electric Corp Multiplexing device having tunable ferromagnetic resonators interposed between two out-of-phase transmission lines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3560884A (en) * 1969-04-16 1971-02-02 Westinghouse Electric Corp Multiplexing device having tunable ferromagnetic resonators interposed between two out-of-phase transmission lines

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939429A (en) * 1973-07-07 1976-02-17 U.S. Philips Corporation Tunable high frequency input circuit for a television receiver that tunes both VHF and UHF channels and can be readily integrated
US4169253A (en) * 1978-05-08 1979-09-25 Loral Corporation Frequency offset technique for YIG devices
US4292357A (en) * 1979-07-25 1981-09-29 Eagle-Picher Industries, Inc. Zinc/zinc oxide laminated anode assembly
US4521753A (en) * 1982-12-03 1985-06-04 Raytheon Company Tuned resonant circuit utilizing a ferromagnetically coupled interstage line
US4543543A (en) * 1982-12-03 1985-09-24 Raytheon Company Magnetically tuned resonant circuit
US4600906A (en) * 1982-12-03 1986-07-15 Raytheon Company Magnetically tuned resonant circuit wherein magnetic field is provided by a biased conductor on the circuit support structure
US4609892A (en) * 1985-09-30 1986-09-02 Motorola, Inc. Stripline filter apparatus and method of making the same

Also Published As

Publication number Publication date
FR2205753B1 (fr) 1978-11-17
IT1001616B (it) 1976-04-30
GB1448254A (en) 1976-09-02
DE2353750A1 (de) 1974-05-09
NL7214941A (fr) 1974-05-07
JPS5244694B2 (fr) 1977-11-10
AU6211773A (en) 1975-05-08
FR2205753A1 (fr) 1974-05-31
DE2353750B2 (de) 1977-03-10
CA1002129A (en) 1976-12-21
JPS4979441A (fr) 1974-07-31

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