JPS58131803A - Ferrite fixing method of nonreversible circuit - Google Patents

Abstract

PURPOSE:To suppress the temperature rise in a ferrite at high power flowing in a circulator, by providing ruggedness for a metal contact surface being a main heat dissipating surface of the ferrite, increasing the contact area and the effect of heat dissipation. CONSTITUTION:Grooves are provided on a plane where the ferrite is in contact with a matching projected surface 2 to spread the surface area, and the cutting of the ferrite is deeper possibly to the degree that the high frequency characteristics are satisfied, allowing to take out the heat generated in the ferrite due to the ferrite loss at the high power input from the inside of ferrite effectively and to dissipate the heat to external space via a waveguide. Thus, the thermal gradient to the vertical direction to the bonding surface of the ferrite is decreased, the ferrite performance is much more satisfied than conventional ones, allowing to improve the power-resistance characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to heat dissipation measures and fixing methods in ferrite in high-power irreversible circuits (glazed circulators, unidirectional tubes, etc.) using ferrite.

The structure of a microwave band Y-branch type circulator using ferrite is shown in FIG. 1, and the structure of a unidirectional tube is shown in FIG.

In Figure 1, two types of structures are shown in Figures (a) and (b) and Figures (c) and (d). Figures (a) and (e) are front views; b) and figure (a) are the respective A-A'
FIG. 3 is a sectional view of a cut surface.

In Figure 2, Figure (a) is a front view, and Figure (b) is a front view.
) is a cross-sectional view taken along the line A-A'.

In both figures, 1 is a ferrite, 2 is an alignment plate or a protruding surface for alignment, 3 is a waveguide section, and 4 is a magnet section.

FIG. 1 shows a case where the ferrite plate 1 is provided facing the inner wall surface of the waveguide, and a case where the ferrite plate 1 is provided facing the inner wall surface of the waveguide.
Two types of structures are shown: one in which it is fixed so as to be sandwiched between the H-planes of

In these cases, ferrite 1 is fixed to the matching plate (or to the waveguide wall if no matching plate is required) by adhesive or soldering, and matching plate 2 is attached to the waveguide. It may be fixed to the part 3 with adhesive or soldering like the ferrite, or it may be made integrally as a partially protruding surface of the waveguide part. FIG. 3, which will hereinafter be referred to as an alignment projecting surface, shows an example of the shape of the ferrite used for these. (
The figure on the left side of each figure a), (b), and (c) is a plan view,
The right side is a side view.

To describe an example of use in relation to Figures 1 and 2, Figure 3 (a
) shape is shown in Fig. 1(a), and Fig. 3(b)
The shape shown in FIG. 1(c) is used in the case of the unidirectional tube shown in FIG. 1(c), and the shape shown in FIG. 3(c) is used in the case of the unidirectional tube shown in FIG.

Magnetic materials such as ferrite have very poor thermal conductivity properties.

Therefore, using a circulator as an example, when a high power signal passes through, the heat generated in the ferrite due to circulator loss (mainly loss in the ferrite part) is
Due to the poor thermal conductivity of ferrite, there are
A large temperature gradient occurs in the ferrite in the direction perpendicular to the waveguide tube axis, and when the temperature exceeds a certain point, the ferrite characteristics change, causing deterioration of the circulator characteristics such as increased insertion loss and decreased isolation. . Furthermore, as the temperature of the ferrite increases, the strength of the adhesive that fixes the ferrite decreases, and in bad cases, the ferrite may fall off and the reflected power may destroy the amplifier.

Therefore, the same applies to C unidirectional tubes in which the ferrite has been conventionally cooled by reducing the thickness of the ferrite.

In order to eliminate these drawbacks, the present invention provides unevenness on the metal contact surface side, which is the main heat dissipation surface of the ferrite, to increase the contact area and improve the heat dissipation effect. In addition to suppressing the increase in ferrite performance and eliminating the increase in insertion loss during high power input, it also improves the power resistance characteristics by preventing the adhesive strength of adhesives etc. from decreasing. Rotation will be explained in detail.

FIG. 4 shows an embodiment in which the present invention is applied to a Y-branch type circulator, in which 1 is a ferrite, 2 is a matching projecting surface manufactured integrally with a waveguide, 3 is a waveguide portion, and 4 is a magnet, and 5 is an adhesive or high-temperature solder that fixes the ferrite.

In the present invention, as shown in this figure, the ferrite is attached to the protruding surface 2 (including the direct wall of the waveguide and the matching plate; hereinafter the same 0) in contact with the protruding surface 2 for alignment as shown in FIG. 4(a). or(
By creating a groove as shown in b) and expanding the surface area of the surface, and at the same time making the cut in the ferrite as deep as possible to satisfy high frequency characteristics, the heat generated in the ferrite due to ferrite loss during high power input can be reduced. is effectively pulled out from inside the ferrite and released into the external space via a waveguide. This reduces the thermal gradient in the direction perpendicular to the bonding surface of the ferrite, satisfies the performance of the siferite compared to the conventional one under high power, and improves the power resistance characteristics. In Fig. 5, the ferrite 1 is fixed. Alignment protruding surface 2
5(a) and 5(b), by fitting the grooves of the alignment projection surface 2 into the grooves of the ferrite, as shown in FIGS. 5(a) and 5(b). It is possible to minimize the amount of adhesive or solder used to fix the ferrite between the ferrite and the alignment protrusion 2, thereby reducing the deterioration of heat conduction properties, which is even more effective in increasing power consumption. is obtained.

The shape of the groove provided in the ferrite varies depending on the shape of the ferrite incorporated in the circuit, but for example, if the surface in contact with the waveguide is circular, it may be a straight groove as shown in Figure 6(a). In addition, the same shape can be considered, such as a large number of concentric circles or a combination of radial and concentric circles as shown in FIG.

Although the present invention has been explained in detail above using a junction type circulator as an example, the same applies to phase shifter type and other types of circulators, and the effect is the same in the case of a unidirectional tube. As shown in the figure, by providing unevenness (the figure shows multiple grooves in the axial direction) on the surfaces where the ferrite and waveguide face each other, the dissipation of heat generated in the ferrite part is improved and the power resistance is improved. Can you enhance its properties?

In the figure, 5' indicates adhesive or solder when the groove is provided only in the ferrite, and in other cases indicates a protrusion from the tube wall side that fits into the groove of the ferrite.

In addition, in the case of a circulator, the shape of the groove provided in the ferrite is determined by the electrical performance (insertion loss, isolation, V
Since it is necessary to maintain the symmetry of the terminals (SWR1, etc.), it is desirable that the shape is symmetrical when viewed from each terminal, and various examples thereof are shown in FIG. Figure (1)
is an example suitable for a 4-port case.

Further, since the heat generation of ferrite in a circulator or the like is maximum at the center, it is effective to make the groove spacing closer toward the center.

As explained above, by providing unevenness on both the waveguide side contact surface of the ferrite provided in various circulators, unidirectional tubes, etc., or on both the ferrite and the surface on the dedicated suction tube side that is in contact with the ferrite, the heat dissipation effect can be significantly improved. This reduces loss in the ferrite due to heat generated in the ferrite when electromagnetic waves pass through it, and has the advantage of greatly improving power durability compared to conventional structures such as circulators and unidirectional tubes.

Further, in the case of a circulator, the uneven grooves provided to improve the heat dissipation effect appear to have the same shape no matter which terminal it is viewed from, so a circulator with good symmetry of characteristics can be obtained.

[Brief explanation of drawings]

Figure 1 is a structural diagram of a conventional Y-branch circulator.
) and (c) are front views, (b) and (d) are cross-sectional views, Figure 2 (a) is an external (front) view of a conventional unidirectional tube, and (b) is a cross-sectional view (internal structure). , FIG. 3 is a shape diagram of conventionally used ferrites, FIG. 4 is a sectional view of the internal structure of an embodiment of the Y-branch circulator of the present invention, and FIG. 5 is another embodiment of the Y-branch circulator of the present invention. 6 is an example of the shape of grooves provided in each ridge ferrite in an embodiment of the present invention, FIG. 7 is an embodiment of the present invention in a unidirectional tube, and FIG. 8 is a groove provided in the ferrite. Examples of various shapes are shown. 1... Ferrite 21111-... Matching plate or matching protrusion surface, 3... Waveguide section, 4... Magnet section, 5-... Ferrite fixing agent, 5 '...
・φ・Protrusion from the pipe wall side that fits into the ferrite fixing agent or ferrite groove Agent Patent attorney Takashi Honma Figure 7 (a) (b) (c)
(d) Figure 2 (b) / Figure 3 (α9 (b) (C) Figure 4 Figure 5 Figure 6 ((1) (6) Figure 7 Cb) (a) (e) ( b) (f) (c) (9) (d) (h) (i) (j) (k) (1)

Claims (4)

[Claims] (1) In a circulator and a unidirectional tube having a structure in which ferrite is attached to a metal matching plate or a matching protruding surface provided on the H-plane, E-plane, or linear plane of the waveguide,
A method for fixing a ferrite in an irreversible circuit, characterized in that a mounting surface of the ferrite is provided with unevenness. (2) At the same time that the ferrite is provided with unevenness, the metal matching plate or matching protruding surface provided on the H-plane, E-plane, or line surface of the waveguide in contact with the ferrite is also fitted with the unevenness provided on the ferrite. A method for fixing ferrite in a nonreciprocal circuit according to claim (1), characterized in that unevenness is provided. (3) If the circulator is a multi-boat,
A method for fixing a ferrite in a non-reciprocal circuit according to claim (1), wherein the shape of the unevenness provided on the ferrite is the same when viewed from each boat. (4) When the circulator is multi-port,
Make sure that the shape of the unevenness provided on the ferrite and the shape of the unevenness provided on the metal matching plate or matching protruding surface provided on the H-plane, E-plane, or linear surface of the waveguide are the same when viewed from each port. A method for fixing ferrite in an irreversible circuit according to claim (2).