KR100809753B1 - Ferrite Disk for Circulator - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ferrite disk for inducing irreversible characteristics in a non-radioactive dielectric waveguide circulator and a method of manufacturing the same. More specifically, the main component of the ferrite disk is a spinel mainly composed of nickel-zinc (Ni + Zn), manganese-zinc (Mn + Zn), and copper-zinc (Cu + Zn) contained in iron (Fe2O3). (spinel type) ferrite, the first additive to obtain a low dielectric constant of 10 or less is to add germanium powder (Ge), cerium powder (Ce) and silicon powder (Si), and to have a large saturation magnetic flux density A second ferrite sintered powder is prepared by adding chromium powder (Cr), titanium powder (Ti), and cobalt powder (Co), respectively. In addition, a bar-shaped molded body having a constant diameter is manufactured, and the first ferrite sintered powder is inserted therein, followed by compression molding. To produce a ferrite disk for a non-radioactive dielectric waveguide shuffler.

Ferrite Disc, Spinel Type, Non-Radio Dielectric Waveguide Shutter

Description

Manufacturing method of ferrite disk for shuffler {Ferrite Disk for Circulator}

Fig. 1: Scheme structure and ferrite disk of non-radioactive dielectric waveguide

Figure 2: Sintered rod-like ferrite sintered body and cut ferrite disc

3 is a microstructure of the surface of the ferrite disk according to the present invention

<Detailed Description of Details>

1: upper conductor plate, 2: lower conductor plate, 3: dielectric waveguide, 4: ferrite disc, 4a: rod-shaped ferrite sintered body, 5a: ferrite particle, 5b: polished ferrite particle, 6: ferrite grain boundary

Generally, ferrite disks used in non-radial dielectric waveguide circulators should be made of high density sintered body with high saturation flux density, and use millimeter wave band using higher frequency than microwave band. To be used in non-radioactive dielectric waveguides, it must have the same low dielectric constant as dielectric waveguides, and ferrite discs for millimeter-wave band shufflers must have high volume manufacturing processes.

The non-radioactive dielectric waveguide shuffler for the millimeter wave band is inserted between the upper and lower conductor plates at intervals of less than half the wavelength of the frequency used, so that it is the main material of the dielectric waveguide with low dielectric constant to ensure insulation between the upper and lower conductor plates. Polytetrafluoroethylene (PTFE, ε = 2.0 ~ 2.21) is used to lower the impedance. This is a reason why dielectric waveguides between upper and lower conductor plates must provide low impedance because the frequency of use is quite high, from 30 GHz to 300 GHz.

Therefore, the ferrite disk located at the center of the non-radiative dielectric waveguide shroud should not only have a low dielectric constant but also be made of a high density disk having a high saturation magnetic flux density for irreversible characteristics. This is because the high saturation magnetic flux density of the ferrite disk increases the irreversible characteristics of the shuffler of the non-radioactive dielectric waveguide, and the low dielectric constant reduces the impedance of the shuffler, thereby improving the signal gain efficiency of the applied RF signal.

In general, ferrite magnetic materials include spinel types such as nickel-zinc (Ni + Zn), manganese-zinc (Mn + Zn), and copper-zinc (Cu + Zn). ) I prefer a lot of magnetic materials. However, the spinel-type ferrite disk as described above has a high saturation magnetic flux density and a dielectric constant of 13 or more, and thus is not suitable for use in a non-radioactive dielectric waveguide shuffler.

In addition, the conventional spinel type ferrite takes a method of adding various metal components to increase the saturation magnetic flux density, but in this case, the hysteresis loss and the eddy current loss are high. In particular, when the eddy current loss is increased, the electromagnetic wave flowing through the non-radioactive dielectric waveguide is not smooth, and the RF signal is trapped in the ferrite, resulting in poor RF transmission signal gain efficiency.

Therefore, the ferrite disk of the non-radioactive dielectric waveguide shuffler has a high saturation flux density, low dielectric constant, and low eddy current loss. Therefore, an advanced method is required in the manufacturing method. Do.

In order to solve the above technical problem, the present invention is a method of manufacturing a ferrite disk for a non-radioactive dielectric waveguide shuffler, the main component of the ferrite disk is nickel-zinc (Ni + Zn), manganese contained in iron (Fe 2 O 3) -In order to obtain a low dielectric constant of 10 or less based on zinc (Mn + Zn) and copper-zinc (Cu + Zn) components, germanium powder (Ge) and silicon powder (Si) are added.

Preferably, the germanium powder (Ge) significantly lowers the dielectric constant of the ferrite disk, and another additive component is chromium powder (Cr), titanium powder (Ti) and cobalt powder (Co) as an additive component, respectively, and the microstructure of the sintered compact. It is made up of these uniform crystals to improve the saturation magnetic flux density of the sintered body. At this time, in the sintering process of the ferrite sintered powder, the oxygen saturation concentration of the ferrite is maintained by adjusting the pressure of the sintering temperature, oxygen and nitrogen atmosphere.

In addition, in order to form into a ferrite disk shape constituting a non-radial dielectric waveguide, the ferrite sintered powder is filled into a molded body made of a stainless steel metal having a rod-molder of a constant diameter. It is molded by the Auto Hydraulic to provide a bar-shaped ferrite sintered body. In addition, the bar-shaped ferrite sintered body is cut to a certain thickness in the shape of a disk, and then the surface of the polishing to produce a ferrite disk.

The present invention relates to a method of manufacturing a ferrite disk 4, which is a magnetic material used in a circulator for a non-radioactive dielectric waveguide.

More specifically, the main material components are high purity nickel-zinc (Ni + Zn), manganese-zinc (Mn + Zn) and copper-zinc (Cu + Zn) contained in iron (Fe ₂ O ₃ ). The first additive component I is a germanium powder (Ge), cerium powder (Ce) and silicon powder (Si) material to have a low dielectric constant of ferrite, and the second additive component II is chromium powder (Cr), Ferrite magnetic powder containing a small amount of titanium powder (Ti), cobalt powder (Co), or the like was used as a raw material.

At this time, the mixed ferrite powder was wet milled in a ball mill and dried, and then calcined at 650 ° C. for 6 hours. At this time, the calcination atmosphere gas was given oxygen gas to remove oxygen from the calcined powder that may occur during the calcining process. To prevent the first sintered ferrite sintered powder was prepared, which has the effect of reducing the shrinkage that occurs significantly when molding the ferrite sintered powder and sintered again at high temperature.

According to the present invention, a rod-molder made of a stainless steel material having a diameter φ of 2.7 ± 0.2 [mm] or 3.7 ± 0.2 [mm] is manufactured, and a rod-shaped sintered ferrite sintered powder is inserted thereinto. (Rode Type) by compression molding in a high pressure hydraulic press (Auto Hydraulic), it is sintered at a temperature between 1100 ℃ to 1300 ℃ to prepare a secondary sintered rod-shaped ferrite sintered body (4a). In particular, the sintering atmosphere gas was oxygen and nitrogen, and the oxygen to nitrogen ratio was 1: 0, 1: 1, 0: 1.

In addition, the secondary sintered ferrite sintered body 4a is cut into a size t between 0.28 ± 0.02 [mm] or 0.5 ± 0.02 [mm] using a wire cutter. The cut ferrite disk was polished for at least 1 hour using a lapping / polishing machine.

The manufactured ferrite disk 4 has a high saturation magnetisation (Saturation Magnetisation), a Curie temperature (Curie temperature) is a spinel (Spinels) type ferrite disk (4) having a low dielectric constant can be obtained. In the present invention, more detailed examples are shown in Table 1, Table 2 and Table 3.

In Example 1, Table 1 shows the main component of the ferrite sintered body 4a as nickel-zinc (Ni + Zn) and shows the content and properties of each additive.

division Main ingredient (wt%) Additive I (wt%) Additive Ingredient II (% by weight) Saturated magnetic flux density (G) Permittivity (ε) Fe ₂ O ₃ NiO ZnO Ce ₂ O ₃ GeO ₂ SiO2 CrO ₃ TiO ₂ Co One 60 15 15 5 0 0 5 0 0 5000 8.7 2 60 15 15 0 5 0 0 5 0 4890 9.5 3 60 15 15 0 0 5 0 0 5 4940 10.2

In Example 2, the main component of the ferrite sintered body 4a is manganese-zinc (Mn + Zn), and shows the content and properties of each additive.

division Main ingredient (wt%) Additive I (wt%) Additive Ingredient II (% by weight) Saturated magnetic flux density (G) Permittivity (ε) Fe ₂ O ₃ NiO MnO Ce ₂ O ₃ GeO ₂ SiO2 CrO ₃ TiO ₂ Co One 60 15 15 3 2 0 4 One 0 4760 6.3

In Example 3, the main component of the ferrite sintered body 4a is manganese-zinc (Mn + Zn), and shows the content and properties of each additive.

division Main ingredient (wt%) Additive I (wt%) Additive Ingredient II (% by weight) Saturated magnetic flux density (G) Permittivity (ε) Fe ₂ O ₃ NiO CuO Ce ₂ O ₃ GeO ₂ SiO2 CrO ₃ TiO ₂ Co One 60 15 15 2.5 0.5 2.0 3 2 0 3400 6.8

In the method of manufacturing the ferrite disc 4, the present invention will be described as follows.

The sintering temperature of the ferrite sintered body composed of the main component and the additive component in Examples 1, 2 and 3 is between 1150 ° C and 1300 ° C, in particular, the sintering atmosphere gas is oxygen and nitrogen, and oxygen to nitrogen The saturation magnetic flux density and dielectric properties were the best when the ratio was 1: 1.

In Examples 1, 2, and 3, the cerium powder (Ce) and the germanium powder (Ge) of the additive component I lower the dielectric constant of ferrite, but when 5.0 wt% or more is added, the saturation magnetic flux density is high. It can be seen that the phenomenon is greatly falling. Therefore, the content of the additive component I is preferably adjusted to 5.0% by weight or less.

In Examples 1, 2 and 3, the chromium powder (Cr), titanium powder (Ti) and cobalt powder (Co) of the additive component II are components that can reduce the eddy current loss of ferrite, but more than two kinds of additives are added. When the component powder is 5.0 wt% or more, the RF signal gain efficiency decreases as the frequency of use of the shuffler increases. Accordingly, the total content of the additive ingredient II is preferably controlled to 5.0 wt% or less.

In the present invention, Fig. 1 shows the circulator structure and ferrite disk 4 of the non-radioactive dielectric waveguide, Fig. 2 is a sintered rod-like ferrite sintered body 4a and a cut ferrite disk, and Fig. 3 shows The microstructure of the surface of the ferrite disk according to the invention is shown. In the non-radial dielectric waveguide of FIG. 1, 1 is an upper conductor plate, 2 is a lower conductor plate, 3 is a dielectric waveguide, and 4 is a ferrite disk.

In addition, 4a of FIG. 2 is a rod-like ferrite sintered body, and the cut ferrite disk is cut into a shape having a thickness t and a diameter φ. 5a of FIG. 3 shows ferrite particles, and it can be seen that the particle size is much smaller and uniform than 10 μm. 5b shows the shape of the ferrite particles polished surface, 6 is a figure showing the distance between the ferrite particles (5a) and particles (5a), it can be seen that the spacing between the particles is very dense.

The ferrite disk of the present invention increases the irreversible characteristics of the shuffler by high saturation magnetic flux density, and the impedance of the shuffler is reduced by the low dielectric constant, so that the signal transmission gain of the applied RF signal is excellent.

Therefore, the ferrite disk manufactured according to the present invention is used as a core component of the magnetic material for the non-radioactive dielectric waveguide shuffler used in the Q band (33 to 50 GHz) or the V band (50 to 75 GHz), and the millimeter wave band having excellent irreversible characteristics is excellent. Provided is a manufacturing method that is manufactured by using a reciprocator and capable of mass production.

Claims (3)

In the method of manufacturing a ferrite disk for a shuffler of a non-radioactive dielectric waveguide, The main components of the ferrite disk are nickel-zinc (Ni + Zn), manganese-zinc (Mn + Zn) and copper-zinc (Cu + Zn) contained in iron (Fe2O3), In order for the ferrite disk to have a low dielectric constant of 10 or less, cerium powder (Ce), germanium powder (Ge) and silicon powder (Si) are respectively added to the main components of the ferrite disk. In order to have a high saturation magnetic flux density of ferrite disks, ferrite disks for non-radiative dielectric waveguides are manufactured by adding chromium powder (Cr), titanium powder (Ti) and cobalt powder (Co), respectively. Manufacturing Method The method of claim 1, The main components of the ferrite disk are nickel-zinc (Ni + Zn), manganese-zinc (Mn + Zn) and copper-zinc (Cu + Zn) contained in iron (Fe2O3), In order for the ferrite disk to have a low dielectric constant of 10 or less, cerium powder (Ce), germanium powder (Ge) and silicon powder (Si) are respectively added to the main components of the ferrite disk. In order to have a high saturation magnetic flux density of the ferrite disk, chromium powder (Cr), titanium powder (Ti) and cobalt powder (Co) were respectively added and wet-pulverized with a ball mill. After drying at room temperature and calcining at 650 ° C. for 6 hours, the primary ferrite sintered powder was prepared by injecting oxygen gas into the calcination atmosphere gas in order to prevent the oxygen component from releasing powder during the calcination process. Fill the ferrite sintered powder into a stainless steel molded body with a rod-shaped mold having a diameter of 2.7 ± 0.2 [mm] or 3.7 ± 0.2 [mm], and then press-form the hydraulic press into a hydraulic press. Sintered at a temperature between 1300 ℃ to prepare a rod-like ferrite sintered body, A method for producing a ferrite disc for a shuffler of a non-radioactive dielectric waveguide characterized in that it is manufactured under a sintering atmosphere gas concentration of sintering temperature and oxygen to nitrogen gas of 1: 1. The method of claim 2, The sintered rod-like ferrite sintered body was cut into a thickness (t) of 0.28 ± 0.02 [mm] or 0.5 ± 0.02 [mm] using a wire cutter. Method for producing a ferrite disk for shuffler of a non-radioactive dielectric waveguide, characterized in that the cut ferrite disk is polished for more than 1 hour using a polishing machine

Images