JPH04131002U - polarization switcher - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a polarization plane switching device that maintains mechanical assembly strength and does not cause deterioration of electrical characteristics due to assembly reasons. [Structure] The cylindrical portion 14a (FIG. 1) of the yoke 14 is a loose fit in the free end region facing the microwave ferrite rod 4 with respect to the waveguide 2, and an interference fit in the base region facing the dielectric 6. By configuring the rods to have different diameters, on the one hand, the force applied to the ferrite rod 4 is reduced to maintain the electrical characteristics, and on the other hand, the force acting on the dielectric body 6 is strengthened to improve mechanical assembly strength. Measure.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is based on a polarization plane switcher, more specifically, a polarization plane switcher, more specifically, a polarization plane switcher, in which a polarization plane switch is used. A microwave ferrite rod that functions as a Faraday rotator, and this ferrite A dielectric material is inserted in contact with both end surfaces of the rod, and the microwave is applied to the outer peripheral surface of the waveguide. In addition to installing a coil device to apply a magnetic field to the ferrite rod, this coil device Regarding the polarization switcher, which has a yoke for guiding magnetic flux from both end faces of the device to the inner peripheral surface. do.

0002

[Conventional technology]

For example, a polarization switcher used for satellite broadcast reception is a parabolic antenna. The received waves are received by In other words, it is used to pass only the received waves of the desired channel. Traditionally, this A type of polarization plane switch that utilizes the Faraday effect of ferrite is used. It is. Figure 6 shows an example of such a polarization plane switcher, which uses non-magnetic gold. A microwave ferrite that functions as a Faraday rotator is installed in the waveguide 2 consisting of a A dielectric rod 4 is inserted at both ends of the dielectric rod 4, which functions as an input/output impedance matching device. The body is arranged. The figure shows only the input side dielectric 6, and the output side dielectric is not shown. It is omitted. On the outer peripheral surface of the waveguide 2, there is a coil bobbin 10 and a coil wound thereon. A coil device 8 consisting of a coil 12 is configured to apply a magnetic field to the microwave ferrite rod 4. It is arranged as a giving means. A magnetic material is applied from the end surface to the inner peripheral surface of the coil device 8. A yoke 14 made of metal is provided.

0003 The polarization plane switch configured in this way changes the magnitude of the current flowing through the coil device 8. It is possible to switch between horizontal and vertical polarization by adjusting the strength of the magnetic field. can. In other words, the linearly polarized wave incident on the dielectric 6 undergoes impedance conversion here. is generated by the coil device 8 while passing through the ferrite rod 4. The plane of polarization is rotated and adjusted as appropriate according to the strength of the magnetic field, and the desired channel is transmitted through the output dielectric. Selectively passes only the received waves of the channel.

0004

[Problem that the idea aims to solve]

When assembling this type of polarization switcher, first insert the ferrite rod 4 into the waveguide 2. After inserting the waveguide 2 and the dielectric 6, the coil device 8 is mounted on the outer peripheral surface of the waveguide 2, and then By press-fitting the cylindrical part of the yoke 14 between the waveguide 2 and the coil device 8, Set each member in a fixed relationship. The cylindrical portion of the yoke 14 is flat to the area of the ferrite rod 4. The cylindrical portion of the yoke 14 is connected between the waveguide 2 and the coil device 8. A strong force is applied to the ferrite rod 4 through the waveguide 2 when it is inserted and fixed in the . The strong mechanical stress applied to the ferrite rod 4 in this way This causes deterioration of the electrical characteristics of the light rod 4. Also, for ferrite rod 4 If a strong force is applied to the dielectric 6, the clamping force applied to the dielectric 6 will be weaker, and the mechanical There is a risk that the assembly strength will decrease.

[0005] This invention maintains mechanical assembly strength while improving electrical characteristics due to assembly reasons. It is an object of the present invention to provide a polarization plane switching device that does not cause deterioration.

[0006]

[Means to solve the problem]

In order to achieve the above purpose, the present invention has developed a polarization switching device having the structure described at the beginning. The cylindrical part of the yoke extends at least from the dielectric side to the microwave ferrite rod side. The end of the microwave ferrite rod is inserted beyond the contact part of the The cylindrical part is a loose fit in the free end region facing the microwave ferrite rod with respect to the waveguide. The base region facing the dielectric is configured with different diameters to provide an interference fit. It is characterized by

[0007]

[Effect]

The free end region of the yoke cylindrical part faces the microwave ferrite rod with respect to the waveguide. The difference is that the base area facing the dielectric is a tight fit. On the one hand, by configuring the ferrite rod to a diameter that reduces the force applied to the ferrite rod, the electrical On the other hand, the force acting on the dielectric material is strengthened to obtain mechanical assembly strength. can be done.

[0008]

【Example】

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

[0009] FIG. 1 shows an example of a polarization plane switching device constructed according to the present invention. illustration The basic structure of the polarization switcher is the same as that shown in FIG. In other words, inside the waveguide 2 , a microwave ferrite rod 4 is inserted, and a dielectric material (for example, a dielectric material 6) is attached to both ends of the rod. to be placed. On the outer peripheral surface of the waveguide 2, from the coil bobbin 10 and the coil 12, A coil device 8 is provided. A magnetic metal yaw is attached to both end faces of the coil device 8. 14 is provided.

0010 The cylindrical portion 14a of the yoke 14 extends from the dielectric 6 side to the microwave ferrite rod 4 side. and the end of the microwave ferrite rod 4 beyond the abutting part of the two. The cylindrical portion 14a has a free end facing the microwave ferrite rod 4 with respect to the waveguide 2. The area is a loose fit, and the base area facing the dielectric 6 is an interference fit. The tapered surface gradually becomes larger in diameter from the base region toward the free end region. is attached.

[0011] Next, the assembly process of the polarization switcher shown in FIG. 1 will be explained.

0012 First, the microwave ferrite rod 4 and the dielectric 6 are inserted into the waveguide 2. next A coil device 8 (not shown) is mounted on the outer peripheral surface of the waveguide 2. Next, waveguide 2 The yoke 14 is fitted between the coil device 8 and the yoke 14 from the free end side of the cylindrical portion by interference fitting. Press fit.

[0013] In the polarization plane switching device configured in this way, the cylindrical portion 14a of the yoke 14 is Since the free end is a loose fit to the waveguide 2, the microwave ferrite rod 4 No large force is applied to the base of the cylindrical portion 14a of the yoke 14. Since it is an interference fit to the waveguide 2, the mechanical clamping force to the dielectric 6 is low. There is nothing to do. Therefore, the electrical characteristics of the microwave ferrite rod 4 are reduced. It also does not reduce the mechanical bonding force between each component. stomach.

[0014] In the embodiment of FIG. 2, the base of the cylindrical portion 14b of the yoke 14 has the outer diameter of the waveguide 2. Although it has a smaller diameter than the above, it is not tapered for the above reason. to this structure Therefore, the electrical characteristics of the microwave ferrite rod 4 are not deteriorated, and It has the effect of not reducing the mechanical bonding force between each component. can play.

[0015] The cylindrical portion 14c of the yoke 14 in FIG. 3 also has no taper and almost faces the dielectric 6. The area facing the microwave ferrite rod 4 has a small diameter (interference fit), and the area facing the microwave ferrite rod 4 has a large diameter. Diameter (clearance fit). With this structure, the embodiments shown in Figs. 1 and 2 can also be It can have the same action and effect.

[0016] Figure 4 shows two types of bias having the structures of Figure 1 (present invention) and Figure 6 (conventional), respectively. Several hundred samples were prepared for each wavefront switching device, and the insertion loss was calculated for each wavefront switching device. This figure shows the results of comparative measurements of loss characteristics. What can be seen from Figure 4 is that this invention Therefore, the characteristics (characteristic line 41) of the polarization plane switching device constructed are as follows: Compared to the characteristics of the converter (characteristic line 42), the insertion loss decreases (the curve shifts to the left). It was confirmed that not only the variation in insertion loss is small (the width of the curve is narrow), but also the variation in insertion loss is small (the width of the curve is narrow). It is something that can be tolerated.

[0017] Figure 5 shows the insertion loss characteristics (characteristic line 51) of the polarization switcher according to the present invention and the conventional polarization This shows the insertion loss characteristics (characteristic line 52) of the surface switching device. From Figure 5, the present invention It can be seen that the insertion loss is reduced compared to the prior art.

[0018]

[Effect of the idea]

As described above, according to the present invention, the yoke cylindrical portion is connected to the waveguide by the microwave. The free end area facing the ferrite rod is a loose fit and the base facing the dielectric. By configuring different diameters to provide an interference fit in the area, on the one hand, the ferrite It aims to maintain electrical properties by reducing the force applied to the rod, and on the other hand, it acts on the dielectric material. The mechanical assembly strength can be improved by increasing the force. In other words, according to this invention Therefore, it is possible to provide a polarization plane switching device with excellent electrical characteristics and excellent assembly strength. can.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the main parts of a polarization plane switching device constructed according to an embodiment of the present invention.

FIG. 2 is a longitudinal cross-sectional view of essential parts showing a modified embodiment of the polarization switcher of FIG. 1;

FIG. 3 is a longitudinal cross-sectional view of essential parts showing another modified embodiment of the polarization switcher in FIG. 1;

FIG. 4 is a distribution curve diagram showing measurement results of insertion loss characteristics of the polarization switch of the present invention and a conventional polarization switch.

FIG. 5 is a characteristic diagram showing insertion loss characteristics of a polarization switch according to the present invention and a conventional polarization switch.

FIG. 6 is a vertical cross-sectional view of the main parts of a conventional polarization switcher.

[Explanation of symbols]

2 Waveguide 4 Microwave ferrite rod 6 Dielectric 8 Coil device 14 York 14a Yoke cylindrical part 14b Yoke cylindrical part 14c Yoke cylindrical part

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Masuo Kato Fuji Electric, 5-36-11 Shinbashi, Minato-ku, Tokyo Within Kagaku Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A microwave ferrite rod functioning as a Faraday rotator and an impedance conversion dielectric material abutting both end surfaces of the ferrite rod are inserted into a waveguide made of a non-magnetic metal, and the waveguide is In the polarization plane switching device, a coil device for applying a magnetic field to the microwave ferrite rod is provided on the outer circumferential surface of the microwave ferrite rod, and a yoke for guiding magnetic flux is arranged from both end surfaces of the coil device to the inner circumferential surface of the polarization plane switching device. The cylindrical part of the yoke is inserted at least from the dielectric side to the microwave ferrite rod side beyond the abutting part of the two to the end of the microwave ferrite rod, and the cylindrical part is inserted into the microwave ferrite rod with respect to the waveguide. A polarization plane switching device characterized in that the polarization plane switching device is configured to have different diameters so that opposing free end regions are a loose fit and a base region facing a dielectric body is an interference fit.