JP2530115Y2 - YIG device - Google Patents

Description

[Detailed description of the invention]

[0001]

In the present invention, the open surface of a pot-shaped magnetic core having a central axis is covered with a plate-shaped magnetic core, and a YIG element is arranged between the end surface of the central axis and the plate-shaped magnetic core. The present invention relates to a YIG device used for a resonator or a filter of an oscillation circuit, by applying a current to a coil wound around a central axis to apply a magnetic field to a YIG element to cause the YIG element to resonate and oscillate.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional YIG device. A central axis 12 is integrally formed at an axial center position in the pot-shaped magnetic core 11, and the open surface of the pot-shaped magnetic core 11 is
Covered with 3. End face of central shaft 12 and plate-shaped magnetic core 1
3, a YIG element 14 is arranged. That is, the YIG element 14 is attached to one end of a support rod 15 parallel to the inner surface of the plate-shaped magnetic core 13, and the other end of the support rod 15 is
Is fixed to the inner surface of the plate-shaped magnetic core 13. A hybrid integrated circuit board 17 is fixed to the inner surface of the plate-shaped magnetic core 13.

[0003] A semi-circular coupling ring 18 is mounted on the substrate 17 so that the YIG element 14 is located at the center, and the coupling ring 18 is formed on the substrate 17. An amplifier connected to an oscillation circuit having the element 14 as a resonator and amplifying the oscillation output is also provided on the substrate 1.
7 is formed. A coil 19 is wound around the central axis 12 so that a current can flow through the coil 19 to apply a magnetic field to the YIG element 14. The application of the magnetic field causes the YIG element 14 to oscillate resonantly and function as a resonator. When used as an oscillator, its oscillation output is led out through a coaxial output terminal (connector) 21 attached to the plate-shaped magnetic core 13.

[0004]

Conventionally, a 45-nickel alloy (45% by weight of Ni, the balance being Fe, so-called PB) is used as the pot-shaped magnetic core 11. When this 45 nickel alloy is melted and formed into a shape, that is, when the crucible-shaped magnetic core 11 is formed by casting, the linearity of the magnetic field-current characteristic is poor and the hysteresis is large. Therefore, since the oscillation frequency corresponds to the strength of the magnetic field applied to the YIG element, the linearity of the oscillation frequency with respect to the control current is poor, and the same magnitude is obtained when the control current is increased and when the control current is decreased. Even with such a control current, the oscillation frequency is considerably different. For this reason, a pot-shaped magnetic core of a cast product can be manufactured at low cost, but has not been put to practical use.

In other words, conventionally, a pot-shaped magnetic core 11 having a center axis 12 is formed by cutting a forged product of a 45 nickel alloy column. The product obtained by cutting this forged product has better linearity and hysteresis of magnetic field-current characteristics than the product made by casting.
1.3 to 1.5 times better. However, the machining cost is extremely high due to the cutting process, and the raw material in the space inside the crucible-shaped magnetic core is wasted.

[0006]

According to the invention, the crucible-shaped magnetic core having a central axis comprises a sendust casting.

[0007]

FIG. 1 shows an embodiment of the present invention, in which parts corresponding to those in FIG. 2 are denoted by the same reference numerals. In the present invention, the pot-shaped magnetic core 11 having the central axis 12 is formed of a sendust casting. The plate-shaped magnetic core 13 is formed by cutting a 45 nickel alloy.

[0008]

As described above, in the present invention, since the wedge-shaped magnetic core having the central axis is formed of a Sendust casting, Sendust has good linearity in magnetic-current characteristics.
Since the saturation level is high and the hysteresis is small,
5 Compared to a 5 nickel alloy machined product, overall characteristics such as the linearity of the oscillation frequency with respect to the control current and the oscillation frequency deviation with respect to the same control current when the control current is increased and decreased are 20 to 30%. Improved. Moreover, since the material is inexpensive and a cast product, it can be manufactured at low cost.

As described above, when a 45-nickel alloy cut product is used as the plate-shaped magnetic core 13, the open end surface of the pot-shaped magnetic core 11 and the plate-shaped magnetic core 13 can be brought into good contact. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional YIG device.

Claims (1)

(57) [Scope of request for utility model registration] An open surface of a pot-shaped magnetic core having a central axis is covered with a plate-shaped magnetic core, a YIG element is disposed between an end surface of the central axis and the plate-shaped magnetic core, and a YIG element is provided on the central axis. A YIG device for applying a magnetic field to the YIG element by applying a current to a wound coil, wherein the pot-shaped magnetic core is formed of a sendust casting.
device.