JPH0615308U - Circulator - Google Patents

Abstract

(57) [Summary] [Purpose] To realize a low-cost circulator. [Structure] Insertion holes having a corresponding shape are formed in the substrate at the junctions of the junction microstrip lines 5a to 5c formed on the substrate. Conductive conductor surfaces 6a and 6b are formed on both surfaces of the ferrite 6 embedded in the insertion hole. further,
Since the conductor surface 6a of the ferrite 6 and the junction type microstrip lines 5a to 5c are electrically adhered by the conductive adhesive 12, the circulation operation can be realized when an appropriate magnetic field is applied to the ferrite 6. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a circulator suitable for use in a millimeter-wave band high-frequency circuit.

[0002]

[Prior art]

 As is well known, in a microwave band or millimeter wave band radar, a circulator in which a plurality of input terminals are irreversible is used in a high frequency circuit section. FIG. 3 is a perspective view showing an example of the circulator 1 used in the millimeter wave band. As shown in this figure, this circulator 1 has rectangular waveguides 1a, 1b, 1c joined in a Y shape, and a ferrite rod 2 of a predetermined size is provided at the center of the H plane Y branch which is the joined portion. Is provided.

In such a structure, when a predetermined DC magnetic field is applied along the axial direction of the ferrite rod 2, the phase shift excited in the ferrite rod 2 causes an input to the opening A to the rectangular waveguide. The microwave is bent toward the rectangular waveguide 1b and output from the opening B. Similarly, the millimeter wave entering from the opening B propagates to the opening C, and the millimeter wave entering from the opening C propagates to the opening A, which is a circulation operation.

Next, FIG. 4 is a perspective view showing an example of the circulator 3 used in the microwave band. In this figure, 4 is a ferrite substrate composed of a ground conductor 4a and a ferrite 4b. A well-known Y-junction strip line 5 is formed on the ferrite substrate 4. Further, a permanent magnet 10 is arranged on the lower surface of the substrate 4 at a position facing the circular joint 5 d. With such a configuration, the ferrite 4b facing the circular junction 5d is magnetized, thereby establishing the circulation operation. That is, the input of the terminal 5a is output to the terminal 5b and the input of the terminal 5b is output to the terminal 5c. Further, the input of the terminal 5c comes to be output to the terminal 5a.

[0005]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional circulator, the ferrite 4b itself is used as the substrate. In general, since the ferrite 4b is fragile to impact and is easily chipped, it is difficult to process, which causes the cost increase of the ferrite substrate 4. As a result, there is a problem that the circulator 3 becomes expensive. The present invention has been made in view of the above circumstances, and an object thereof is to realize a low-cost circulator.

[0006]

[Means for Solving the Problems]

 The circulator according to the present invention is a circulator in which a predetermined magnetic field is applied to a junction type microstrip line formed on a substrate, and an insertion hole having a shape corresponding to the junction part of the junction type microstrip line is formed in the substrate. A conductive conductor surface is formed on both sides, and a ferrite embedded in the insertion hole and a conductive adhesive means for electrically bonding the conductor surface and the microstrip line are provided. There is.

[0007]

[Action]

 According to the above configuration, ferrite is embedded in the insertion hole formed in the substrate. The conductor surface of the ferromagnetic material and the strip line formed on the substrate are bonded by the conductive bonding means. Then, when an appropriate magnetic field is applied to the strip line, the circulation operation is performed. Therefore, it becomes possible to construct a circulator using an ordinary printed circuit board.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the structure of a circulator 7 according to an embodiment of the present invention. In this figure, the difference from the configuration shown in FIG. 4 is that a normal printed circuit board 11 is used as the substrate of the circulator 7. That is, 11a is a ground conductor made of, for example, copper foil, and 11b is a dielectric having a predetermined dielectric constant. The printed board 11 is composed of the ground conductor 11a and the dielectric 11b. 6 is a ferrite, which is formed in a short cylindrical shape. The ferrite 6 is embedded in an insertion hole provided in the printed board 11. The insertion hole is provided at a portion corresponding to the conventional circular joint 5d (see FIG. 4). Gold is vapor-deposited on the upper and lower surfaces of the ferrite 6 to form conductor surfaces 6a and 6b, respectively. Next, the relationship between the ferrite 6 and the strip line 5 will be described with reference to FIG.

In FIG. 2, terminals 5a, 5b, 5c each made of a microstrip line are provided at positions corresponding to the conventional Y-junction type strip line 5 in the same manner. Here, a conductive adhesive 12 is applied to each of the joints between the terminals 5a, 5b, 5c and the ferrite 6, so that the conductor surface 6a of the ferrite 6 and the terminals 5a, 5b, 5c are respectively connected. It is electrically connected.

According to the circulator having such a configuration, when the permanent magnet 10 applies a predetermined static magnetic field in the axial direction of the ferrite 6 and magnetizes the ferrite 6, a circulation operation equivalent to that of the conventional example described above is realized. It In this way, the ferrite 6 is used only in the portion corresponding to the conventional circular joint 5d, and the same circulation operation as the conventional one can be obtained. That is, according to this embodiment, the circulator operation equivalent to the conventional one can be realized by using the normal printed circuit board 11, so that the circulator becomes an extremely low cost. Here, the diameter r and the thickness t of the ferrite 6 are determined according to the used frequency and the resonance mode (mode).

If the ferrite 6 having a large magnetic field is used and magnetized in advance, the ferrite 6 itself has a static magnetic field, so that the permanent magnet 10 for applying an external magnetic field becomes unnecessary. By doing so, the work of attaching the magnet is not required, and the cost can be further reduced.

[0012]

[Effect of device]

 As described above, according to the present invention, the ferromagnetic body 6 is embedded in the insertion hole formed in the substrate 11. The conductor surface 6a of the ferromagnetic body 6 and the strip line 5 formed on the substrate 11 are adhered by the conductive adhering means 12, so that when a suitable magnetic field is applied to the strip line 5, the circulation occurs. The action is taken. Therefore, there is an effect that a low-cost circulator using the ordinary printed circuit board 11 can be realized.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of a circulator according to an embodiment of the present invention.

FIG. 2 is a plan view showing a configuration of a circulator according to the same embodiment.

FIG. 3 is a perspective view showing a configuration of a circulator used in a conventional microwave band.

FIG. 4 is a perspective view showing a configuration of a circulator used in a conventional millimeter wave band.

[Explanation of symbols]

 5: Microstrip line 6: Ferrite 7: Circulator 11: Printed circuit board

Claims (1)

[Scope of utility model registration request] 1. A circulator in which a predetermined magnetic field is applied to a junction type microstrip line formed on a substrate, wherein an insertion hole having a shape corresponding to the junction part of the junction type microstrip line is formed in the substrate, A conductive conductor surface is formed on the substrate, and ferrite is embedded in the insertion hole; and conductive bonding means for electrically bonding the conductor surface and the bonded microstrip line. Circulator.