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Garnet ferrite and a non-reciprocal circuit element applying the same

A circuit component, red ferrite technology, applied in electrical components, circuits, iron compounds, etc., can solve the problems of increased half-value amplitude and increased insertion loss of isolators, and achieves small temperature changes in characteristics and low loss. , the effect of small loss

Inactive Publication Date: 2005-03-30
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the above A 3 B 5 o 12 The composition formula, or the above Y 3-3x-z Gd 3x Ca z Fe 5-5y-z-5e al 5y sn z o 12 In the conventional garnet ferrite represented by the composition formula of , although the absolute value of α above can be reduced as the addition amount of Gd increases, there is a problem that the half-value amplitude (ΔH) of the ferromagnetic resonance increases, and in Increased insertion loss of isolators used in high frequency bands such as microwave bands

Method used

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  • Garnet ferrite and a non-reciprocal circuit element applying the same
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  • Garnet ferrite and a non-reciprocal circuit element applying the same

Examples

Experimental program
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Effect test

Embodiment

[0085] Embodiment (1-1~1-24)

[0086] According to the composition of each sample shown in Tables 1-2 below, Y 2 o 3 Powder, Gd 2 o 3 Powder, Fe 2 o 3 Powder, Co 3 o 4 Powder, SiO 2 Powder, Al 2 o 3The powders were mixed, and after drying the mixture, it was calcined at 1200° C. for 4 hours to obtain a calcined product. Next, the calcined product was put into the same ball mill as above together with an organic binder, and wet pulverized for 20 hours. The pulverized product is mainly fired at 1350°C to 1500°C in air or in an oxygen atmosphere to obtain Y 3-x Gd x Fe t-2y-z co y Si y Al z o 12 Garnet ferrite samples having such a composition (Examples 1-1 to 1-24).

[0087] The 4πMs of the garnet red ferrite samples of Examples 1-1 to 1-24, the magnetization temperature coefficient α (-35) at -35°C to +25°C, and the magnetization temperature coefficient at +25°C to +85°C were obtained. The temperature coefficient of magnetization α (85) and the ferromagnetic ...

Embodiment 2-1～2-3

[0123] In accordance with the composition of each sample shown in Table 5 below, except for the use of Y 2 o 3 Powder, Gd 2 o 3 Powder, Fe 2 o 3 Powder, Co 3 o 4 Powder, SiO 2 Powder, Al 2 o 3 Powder, SnO 2 or ZrO 2 or HfO 2 Except that, the same process as the above-mentioned embodiment was carried out to obtain Y 1.9 Gd 1 Ca 0.1 Fe 4.563 co 0.01 Si0.01 D. 0.1 Al 0.2 o 12 Garnet ferrite samples (Examples 2-1 to 2-3) having such a composition (wherein D is Zr, Hf, or Sn). Table 5 shows the results of obtaining 4πMs, α(-35), α(85), and ΔH of the garnet ferrite samples of Examples 2-1 to 2-3.

Embodiment 3-1

[0138] In accordance with the composition of each sample shown in Table 7 below, except using Y 2 o 3 Powder, Gd 2 o 3 Powder, Fe 2 o 3 Powder, Co 3 o 4 Powder, SiO 2 Powder, In 2 o 3 Powder, Al 2 o 3 Except for the powder, it was processed in the same manner as in the above-mentioned examples to obtain Y 2 Gd 1 Fe 4.563 co 0.01 Si 0.01 In 0.1 Al 0.2 o 12 A garnet ferrite sample having such a composition (Example 3-1). Table 7 shows the results of 4πMs, α(-35), α(85) and ΔH of the garnet ferrite sample of Example 3-1.

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Abstract

A garnet ferrite for a non-reciprocal circuit element expressed by the formula Y3-xGdxFet-2y-zCoySiyAlzO12 (where 0.2<=x<=1.5, 0.005<=y<=0.015, 0<=z<=1.5, 4.75<=t<=5) is provided. The absolute temperature coefficient alphaof 4piMs and the ferromagnetic resonance half-width DeltaH are low. In addition, an isolator is provided, wherein the isolator includes a magnetic assembly made up of a main body (the garnet ferrite element) and a plurality of center conductors disposed on the upper surface of the main body so that each of the center conductors intersect at a predetermined angle while being electrically insulated from each other, a magnet for applying a direct current magnetic field to the magnetic assembly, matching capacitors, and a yoke (upper and lower cases) for holding all the components. Loss is low in a high-frequency band, such as the microwave band.

Description

technical field [0001] The present invention relates to a garnet red ferrite suitable for non-reciprocal circuit elements used in high-frequency bands such as microwaves and non-reversible circuit elements using the garnet red ferrite, in particular to a 4πMS The absolute value of the temperature coefficient (α) and the technology that can reduce the half-value amplitude of the strong magnetic resonance. Background technique [0002] Conventionally, Mn—Zn ferrite, Ni—Zn ferrite, lithium ferrite, YIG ferrite, etc. have been known as high frequency magnetic materials. In addition, in wireless communication equipment such as mobile phones, high-frequency magnetic materials are used as non-reciprocal circuit element materials for the purpose of stabilizing the operation of the amplifier and preventing cross-modulation, etc., provided between the antenna and the amplifier. [0003] Even among the above-mentioned magnetic materials, YIG ferrite is known to have 3 Fe 5 o 12 Thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00C04B35/26H01P1/36H01P1/383H01P1/387
CPCH01P1/387
Inventor 高馆金四郎
Owner ALPS ALPINE CO LTD
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