WO2014083881A1 - Isolateur à absorption de ferrite - Google Patents

Isolateur à absorption de ferrite Download PDF

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Publication number
WO2014083881A1
WO2014083881A1 PCT/JP2013/068953 JP2013068953W WO2014083881A1 WO 2014083881 A1 WO2014083881 A1 WO 2014083881A1 JP 2013068953 W JP2013068953 W JP 2013068953W WO 2014083881 A1 WO2014083881 A1 WO 2014083881A1
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Prior art keywords
opening
ferrite
isolator
absorption type
input
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PCT/JP2013/068953
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English (en)
Japanese (ja)
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長谷川　隆
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株式会社村田製作所
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Publication of WO2014083881A1 publication Critical patent/WO2014083881A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/32—Non-reciprocal transmission devices
    • H01P1/36—Isolators
    • H01P1/365—Resonance absorption isolators

Definitions

  • the present invention relates to a ferrite absorption isolator, and more particularly to a ferrite absorption isolator used in a microwave band or the like.
  • an isolator has a characteristic of transmitting a signal only in a specific direction and not transmitting in a reverse direction, and is mounted on a transmission circuit unit of a mobile communication device such as a mobile phone.
  • a ferrite absorption type isolator the thing of patent documents 1 and 2 is known, for example.
  • This type of isolator is a magnetic field (circularly polarized wave) that rotates at the intersection when two high-frequency currents with the same amplitude and phase that differ by a quarter wavelength flow through two orthogonal lines (having four openings). ) Occurs, and the phenomenon that the turning direction of circularly polarized waves is reversed according to the electromagnetic wave traveling directions of the two lines is used.
  • a ferrite is placed at the intersection and a static magnetic field is applied by a permanent magnet, and a positive circularly polarized wave or a negatively circularly polarized wave is generated by a reflected wave from the sub line according to the traveling direction of the electromagnetic wave propagating through the main line.
  • a positive circular polarization occurs, the signal is absorbed by the magnetic loss of the ferrite, and when a negative circular polarization occurs, the signal passes through without any magnetic loss.
  • a reactance element that reflects a signal is connected to an end of the sub line.
  • the isolator described in Patent Document 3 is made to reduce the size, and as shown in FIGS. 25 and 26, a joining conductor 115 having three openings P1, P2, and P3 is formed on the ferrite 110, and
  • the junction conductor 115 includes a main line disposed between the first opening P1 and the second opening P2, and a sub line that branches from the main line and reaches the third opening P3.
  • the main line resonates.
  • the reactance element (capacitor C or inductor L) is connected to the third opening P3, and the reactance element is connected to the ground.
  • impedance matching capacitors C111 and C112 are connected to the first opening P1 and the second opening P2, respectively.
  • an object of the present invention is to provide a ferrite absorption isolator capable of securing a relatively large isolation.
  • the ferrite absorption isolator according to the first aspect of the present invention is With ferrite, A bonding conductor having a first opening, a second opening, a third opening and a fourth opening, disposed in the ferrite; A permanent magnet for applying a DC magnetic field to the ferrite; With The joint conductor is composed of a main line disposed between the first opening and the second opening, and two sub lines branched from the main line to reach the third opening and the fourth opening, respectively. Two of the four openings are input / output ports, and reactance elements are connected to the remaining two openings, and the reactance elements are connected to the ground, It is characterized by.
  • the ferrite absorption isolator according to the second aspect of the present invention is With ferrite, A bonding conductor having a first opening, a second opening, a third opening, a fourth opening, and a fifth opening disposed in the ferrite; A permanent magnet for applying a DC magnetic field to the ferrite; With The junction conductor includes a main line disposed between the first opening and the second opening, and three sub lines branched from the main line to reach the third opening, the fourth opening, and the fifth opening, respectively. Consists of Two of the five openings are input / output ports, and reactance elements are connected to the remaining three openings, and the reactance elements are connected to the ground, It is characterized by.
  • the reflected wave from the sub line to which the reactance element is connected to the incident wave from the input opening are adjusted so that their phases are shifted by about 90 degrees and the amplitude is about half.
  • the phase of the reflected wave from the sub line to which the reactance element is connected is opposite to the incident wave from the input opening so that the amplitude is equal. It has been adjusted. As a result, negative elliptically polarized waves are generated in the forward direction, and linearly polarized waves are generated in the reverse direction.
  • FIG. 1 is an equivalent circuit diagram of a ferrite absorption isolator according to a first embodiment. It is a graph which shows the characteristic of the ferrite absorption type isolator which is the 1st example. It is a graph which shows the characteristic of the ferrite absorption type isolator which is the 2nd example. It is a graph which shows the characteristic of the ferrite absorption type isolator which is 3rd Example. It is a perspective view which shows the ferrite absorption type isolator which is 4th Example.
  • the ferrite absorption isolator 1 ⁇ / b> A includes a ferrite 10 and a joint conductor 15 having four openings P ⁇ b> 1, P ⁇ b> 2, P ⁇ b> 3, P ⁇ b> 4 arranged on the surface of the ferrite 10. And a pair of permanent magnets 20 for applying a DC magnetic field to the ferrite 10, capacitors C1 and C2 as reactance elements, and a mounting substrate 30.
  • the joining conductor 15 is a thin film formed by vapor deposition using a conductive metal or a thick film formed by applying and baking a conductive paste.
  • the two sub lines branched from the main line arranged between the openings P1 and P2 of the joint conductor 15 extend in the direction substantially orthogonal to the main line and extend upward from the back side of the ferrite 10 to the bottom surface. It wraps around and further wraps around to the surface side.
  • the ends of the two sub-lines are an opening P3 and an opening P4, respectively.
  • One ends of capacitors C1 and C2 are connected to the opening P3 and the fourth opening P4, respectively.
  • the main line means a conductor between the openings P1 and P2
  • the sub-line means a conductor branched from the substantially central portion of the main line to reach the openings P3 and P4.
  • the mounting substrate 30 is formed with an input terminal electrode 31, an output terminal electrode 32, relay terminal electrodes 33 and 34, and ground terminal electrodes 41 and 42, respectively.
  • the ferrite 10 and the permanent magnet 20 have the same area, and the ferrite 10 is mounted on the mounting substrate 30 with the permanent magnets 20 attached to both side surfaces.
  • one end (opening P1) of the main line is connected to the input terminal electrode 31, the other end (opening P2) is connected to the output terminal electrode 32, and the end portions (openings P3 and P4) of the sub line are relay terminal electrodes. 33 and 34, respectively.
  • One end of the capacitor C ⁇ b> 1 is connected to the relay terminal electrode 33, and the other end is connected to the ground terminal electrode 41.
  • One end of the capacitor C ⁇ b> 2 is connected to the relay terminal electrode 34, and the other end is connected to the ground terminal electrode 42.
  • the reflected wave from the sub-line to which the capacitors C1 and C2 are connected is reflected with respect to the incident wave from the opening P1 or the opening P2.
  • the phase is adjusted to be about 90 degrees and the amplitude is adjusted to about half.
  • the reflected wave from the sub line to which the capacitors C1 and C2 are connected has an opposite phase to the incident wave from the opening P1 or the opening P2, and the amplitude is equal. It has been adjusted to be.
  • negative elliptically polarized waves are generated in the forward direction, and linearly polarized waves are generated in the reverse direction.
  • the negative elliptical polarization has a permeability of almost zero near the magnetic resonance point, high-frequency energy is concentrated outside the ferrite 10 and propagates with low loss.
  • the linearly polarized wave has a large magnetic permeability near the magnetic resonance point, high-frequency energy is concentrated inside the ferrite 10 and is absorbed by the ferrite 10 due to magnetic resonance loss.
  • the input return loss of the ferrite absorption isolator 1A according to the first embodiment is shown in FIG. 4A
  • the isolation is shown in FIG. 4B
  • the insertion loss is shown in FIG. 4C
  • the output return loss is shown.
  • the ferrite 10 used had a saturation magnetization of 80 mT, a size having a main surface length of 1.0 mm, a main surface height of 0.5 mm, and a thickness of 0.15 mm.
  • Capacitors C1 and C2 have a capacitance of 9 pF.
  • the impedance between the input terminal and the output terminal is 7 ⁇ , and the electrical characteristics are normalized by the input / output 7 ⁇ .
  • the insertion loss is 0.75 dB and the isolation is 12.9 dB.
  • the characteristics of the ferrite absorption isolator 100A shown in FIG. 25 are indicated by thin lines in FIGS. 4 (A) to 4 (D), respectively.
  • a ferrite 110 having a saturation magnetization of 80 mT, a main surface length of 0.8 mm, a main surface height of 0.5 mm, and a thickness of 0.15 mm was used.
  • Capacitor C has a capacitance of 9 pF.
  • the impedance between the input end and the output end is 10 ⁇ , and the electrical characteristics are normalized by the input / output 10 ⁇ .
  • the insertion loss is 0.45 dB and the isolation is 6.6 dB.
  • the isolator 1A of the first embodiment is greatly improved in isolation. This is because the isolation is ensured for every two sub-lines, and the isolation as a whole increases.
  • the ferrite absorption type isolator 1A is incorporated in a transmission circuit module of a mobile communication device, for example.
  • the mounting board 30 may be a printed wiring board for mounting a power amplifier in the transmission circuit module.
  • the ferrite 10 provided with the joining conductor 15 and having the permanent magnet 20 attached thereto is supplied to the assembling process of the transmission module. This also applies to the embodiments shown below.
  • the ferrite absorption type isolator according to the second embodiment has the same configuration as the isolator 1A according to the first embodiment, and both capacitors C1 and C2 have a capacity of 6 pF.
  • the input return loss is shown in FIG. 5 (A)
  • the isolation is shown in FIG. 5 (B)
  • the insertion loss is shown in FIG. 5 (C)
  • the output return loss is shown in FIG. 5 (D).
  • the impedance between the input terminal and the output terminal is 9 ⁇ , and the electrical characteristics are normalized by the input / output 9 ⁇ .
  • the insertion loss is 0.56 dB and the isolation is 8.6 dB.
  • the ferrite absorption type isolator according to the third embodiment has the same configuration as the isolator 1A according to the first embodiment, and the capacitor C1 has a capacitance of 9 pF and the capacitor C2 has a capacitance of 6 pF.
  • the input return loss is shown in FIG. 6 (A)
  • the isolation is shown in FIG. 6 (B)
  • the insertion loss is shown in FIG. 6 (C)
  • the output return loss is shown in FIG. 6 (D).
  • the impedance between the input end and the output end is 8 ⁇ , and the electrical characteristics are normalized by the input / output 8 ⁇ .
  • the insertion loss is 0.66 dB and the isolation is 10.9 dB.
  • the ferrite absorption type isolator 1B according to the fourth embodiment is obtained by branching three sub-lines from the main line in the junction conductor 15, and each end of the sub-line is opened. P3, opening P4 and opening P5 are connected to capacitors C1, C2 and C3 as reactance elements, respectively.
  • a relay terminal electrode 35 and a ground terminal electrode 43 are additionally formed on the mounting substrate 30.
  • the end (opening P5) of the third sub-line is connected to the relay terminal electrode 35, and one end of the capacitor C3 is connected to the relay terminal electrode 35, and the other end is connected to the ground terminal electrode 43.
  • the operation of the ferrite absorption isolator 1B according to the fourth embodiment is the same as that of the isolator 1A.
  • the input return loss is shown in FIG. 10A
  • the isolation is shown in FIG. 10B
  • the insertion loss is shown. 10 (C)
  • the output return loss is shown in FIG. 10 (D).
  • the ferrite 10 used had a saturation magnetization of 80 mT, a size having a main surface length of 1.3 mm, a main surface height of 0.5 mm, and a thickness of 0.15 mm.
  • Capacitors C1, C2, and C3 have a capacitance of 9 pF.
  • the impedance between the input terminal and the output terminal is 7 ⁇ , and the electrical characteristics are normalized by the input / output 7 ⁇ . In the 824 to 849 MHz band, the insertion loss is 0.98 dB and the isolation is 14.4 dB.
  • the configuration of the bonding conductor 15 is the same as that of the isolator 1A according to the first embodiment, and inductors L1 and L2 are used as reactance elements. Further, capacitors C11 and C12 dropped to the ground are connected to the openings P1 and P2 which are the input end and the output end, respectively. Capacitors C11 and C12 are for matching input / output impedances.
  • the mounting substrate 30 is formed with an input terminal electrode 31, an output terminal electrode 32, relay terminal electrodes 33, 34, and ground terminal electrodes 41, 42, 43, respectively.
  • One end (opening P1) of the main line is connected to the input terminal electrode 31, the other end (opening P2) is connected to the output terminal electrode 32, and the end parts (openings P3 and P4) of the sub line are connected to the relay terminal electrodes 33 and 34.
  • One end of the inductor L1 is connected to the relay terminal electrode 33 and the other end is connected to the ground terminal electrode 41.
  • One end of the inductor L2 is connected to the relay terminal electrode 34, and the other end is connected to the ground terminal electrode 42.
  • One end of the capacitor C ⁇ b> 11 is connected to the input terminal electrode 31, and the other end is connected to the ground terminal electrode 43.
  • the capacitor C12 has one end connected to the output terminal electrode 32 and the other end connected to the ground terminal electrode 43.
  • the operation of the ferrite absorption type isolator 1C according to the fifth embodiment is basically the same as that of the isolator 1A.
  • the input return loss is shown in FIG. 14A
  • the isolation is shown in FIG.
  • the loss is shown in FIG. 14C
  • the output return loss is shown in FIG.
  • the ferrite 10 used had a saturation magnetization of 80 mT, a size having a main surface length of 1.0 mm, a main surface height of 0.5 mm, and a thickness of 0.15 mm.
  • the inductances of the inductors L1 and L2 are both 2nH.
  • Capacitors C11 and C12 have a capacitance of 14 pF.
  • the impedance between the input terminal and the output terminal is 7 ⁇ , and the electrical characteristics are normalized by the input / output 7 ⁇ .
  • the insertion loss is 2.53 dB and the isolation is 18.0 dB.
  • the isolation can be improved by increasing the number of branches.
  • the characteristics of the ferrite absorption isolator 100B shown in FIG. 26 are indicated by thin lines in FIGS. 14 (A) to (D), respectively.
  • the ferrite 110 having a saturation magnetization of 80 mT, a size having a main surface length of 0.8 mm, a main surface height of 0.5 mm, and a thickness of 0.15 mm was used.
  • the inductance of the inductor L is 2 nH.
  • the capacitances of the capacitors C111 and C112 are both 8 pF.
  • the impedance between the input end and the output end is 10 ⁇ , and the electrical characteristics are normalized by the input / output 10 ⁇ .
  • the insertion loss is 1.33 dB and the isolation is 9.2 dB.
  • the isolator 1C according to the fifth embodiment is greatly improved in isolation.
  • the sub-line is branched into two lines from one place in the substantially central portion of the main line.
  • Other configurations are the same as those of the isolator 1A according to the first embodiment.
  • the operation of the ferrite absorption type isolator according to the sixth embodiment is basically the same as that of the isolator 1A.
  • the input return loss is shown in FIG. 16A
  • the isolation is shown in FIG. Is shown in FIG. 16C
  • the output return loss is shown in FIG.
  • the ferrite 10 used had a saturation magnetization of 80 mT, a size having a main surface length of 1.0 mm, a main surface height of 0.5 mm, and a thickness of 0.15 mm.
  • Capacitors C1 and C2 have a capacitance of 9 pF.
  • the impedance between the input terminal and the output terminal is 7 ⁇ , and the electrical characteristics are normalized by the input / output 7 ⁇ . In the 824 to 849 MHz band, the insertion loss is 0.78 dB and the isolation is 13.0 dB.
  • the ferrite absorption type isolator 1D has an opening P1 as an input port and an opening P3 as an output port. Capacitors C1 and C2 are connected.
  • the line extending from the opening P1 to the opening P3 is the main line, and the two lines branched from the main line and reaching the opening P2 and the opening P4, respectively, are the sub lines.
  • the mounting substrate 30 is formed with an input terminal electrode 31, an output terminal electrode 32, relay terminal electrodes 33 and 34, and ground terminal electrodes 41 and 42, respectively.
  • One end (opening P1) of the main line is connected to the input terminal electrode 31, the other end (opening P3) is connected to the output terminal electrode 32, and the end parts (openings P2, P4) of the sub line are connected to the relay terminal electrodes 33, 34.
  • One end of the capacitor C 1 is connected to the relay terminal electrode 34, and the other end is connected to the ground terminal electrode 42.
  • One end of the capacitor C ⁇ b> 2 is connected to the relay terminal electrode 33, and the other end is connected to the ground terminal electrode 41.
  • the operation of the ferrite absorption isolator 1D having the above configuration is basically the same as that of the isolator 1A.
  • the input return loss is shown in FIG. 20A
  • the isolation is shown in FIG. Is shown in FIG. 20C
  • the output return loss is shown in FIG.
  • the ferrite 10 used had a saturation magnetization of 80 mT, a size having a main surface length of 1.0 mm, a main surface height of 0.5 mm, and a thickness of 0.15 mm.
  • Capacitors C1 and C2 have a capacitance of 9 pF.
  • the impedance between the input end and the output end is 10 ⁇ , and the electrical characteristics are normalized by the input / output 10 ⁇ . In the 824 to 849 MHz band, the insertion loss is 1.75 dB and the isolation is 13.2 dB.
  • the ferrite absorption isolator 1E As shown in FIGS. 21 to 24, the ferrite absorption isolator 1E according to the eighth embodiment has an opening P3 as an input port and an opening P4 as an output port.
  • the opening P1 and the opening P2 each have a reactance element.
  • Capacitors C1 and C2 are connected.
  • the line extending from the opening P3 to the opening P4 is the main line, and the two lines branching from the main line and respectively reaching the opening P1 and the opening P2 are sub-lines.
  • the mounting substrate 30 is formed with an input terminal electrode 31, an output terminal electrode 32, relay terminal electrodes 33 and 34, and a ground terminal electrode 44, respectively.
  • One end (opening P3) of the main line is connected to the input terminal electrode 31, the other end (opening P4) is connected to the output terminal electrode 32, and the end portions (openings P1, P2) of the sub line are connected to the relay terminal electrodes 33, 34.
  • One end of the capacitor C ⁇ b> 1 is connected to the relay terminal electrode 33, and the other end is connected to the ground terminal electrode 44.
  • One end of the capacitor C ⁇ b> 2 is connected to the relay terminal electrode 34, and the other end is connected to the ground terminal electrode 44.
  • the operation of the ferrite absorption isolator 1E having the above configuration is basically the same as that of the isolator 1A.
  • the input return loss is shown in FIG. 24A
  • the isolation is shown in FIG. Is shown in FIG. 24C
  • the output return loss is shown in FIG.
  • the ferrite 10 used had a saturation magnetization of 80 mT, a size having a main surface length of 1.0 mm, a main surface height of 0.5 mm, and a thickness of 0.15 mm.
  • Capacitors C1 and C2 have a capacitance of 9 pF.
  • the impedance between the input end and the output end is 8 ⁇ , and the electrical characteristics are normalized by the input / output 8 ⁇ . In the 824 to 849 MHz band, the insertion loss is 1.74 dB and the isolation is 9.5 dB.
  • the ferrite absorption type isolator according to the present invention is not limited to the above embodiment, and can be variously modified within the scope of the gist thereof.
  • the routing shape of the joining conductor is arbitrary, and the size of the ferrite, the numerical value of the saturation magnetization, and the numerical value of the reactance element shown in each example are not limited thereto. Further, the size, shape, structure, etc. of the mounting substrate are arbitrary.
  • the present invention is useful for ferrite absorption isolators, and is particularly excellent in that a relatively large isolation can be secured.

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Abstract

Dans l'isolateur à absorption de ferrite de l'invention, une isolation relativement importante est préservée. Plus précisément, l'isolateur à absorption de ferrite de l'invention de l'invention, est équipé : d'une ferrite (10) ; d'un conducteur de liaison (15) qui est disposé sur la ferrite (10), et qui possède une première ouverture (P1), une seconde ouverture (P2), une troisième ouverture (P3) et une quatrième ouverture (P4) ; et d'un aimant permanent (20) qui applique un champ magnétique de courant continu sur la ferrite (10). Le conducteur de liaison (15) est constitué d'un chemin principal disposé entre les première et seconde portes (P1, P2), et de deux chemins secondaires dérivant du chemin principal pour mener aux troisième et quatrième portes (P3, P4), prend pour ports d'entrée/sortie deux ouvertures parmi les quatre mentionnées, et connecte des éléments réactance (C1, C2) ou (L1, L2) aux deux ouvertures restantes. Ces éléments réactance sont connectés à la terre.
PCT/JP2013/068953 2012-11-27 2013-07-11 Isolateur à absorption de ferrite WO2014083881A1 (fr)

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Application Number Priority Date Filing Date Title
JP2012-258229 2012-11-27
JP2012258229 2012-11-27

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WO2014083881A1 true WO2014083881A1 (fr) 2014-06-05

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2338014A1 (de) * 1972-07-26 1974-02-07 Mitsubishi Electric Corp Isolator
JPS4936249A (fr) * 1972-08-04 1974-04-04
JPS5080055A (fr) * 1973-11-13 1975-06-28
WO2011077803A1 (fr) * 2009-12-26 2011-06-30 株式会社村田製作所 Isolateur de type à résonance magnétique

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2338014A1 (de) * 1972-07-26 1974-02-07 Mitsubishi Electric Corp Isolator
FR2197245A1 (fr) * 1972-07-26 1974-03-22 Mitsubishi Electric Corp
US3835420A (en) * 1972-07-26 1974-09-10 Mitsubishi Electric Corp Isolator
GB1446778A (en) * 1972-07-26 1976-08-18 Mitsubishi Electric Corp Isolator
JPS4936249A (fr) * 1972-08-04 1974-04-04
JPS5080055A (fr) * 1973-11-13 1975-06-28
WO2011077803A1 (fr) * 2009-12-26 2011-06-30 株式会社村田製作所 Isolateur de type à résonance magnétique
CN102668235A (zh) * 2009-12-26 2012-09-12 株式会社村田制作所 磁共振型隔离器
US8319576B2 (en) * 2009-12-26 2012-11-27 Murata Manufacturing Co., Ltd. Magnetic resonance isolator

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