Ka-band full-band waveguide isolator

Abstract

The utility model discloses a Ka-band full-band waveguide isolator, comprising a waveguide isolator cavity, the waveguide isolator cavity comprises an upper cavity and a lower cavity, the opposite end surfaces of the upper cavity and the lower cavity are respectively provided with a Y-shaped matching step, the middle part of the Y-shaped matching step is provided with a circular step, the circular step is provided with a ferrite, and the ferrite is provided with a magnetic field. The upper cavity and the lower cavity are internally provided with load cavities, the load cavities are internally provided with absorbers, the absorbers are packaged in the load cavities through absorber cover plates, the upper cavity and the lower cavity are internally provided with magnetic field cavities, the magnetic field cavities are internally provided with permanent magnets, and the permanent magnets are bonded through magnetic field cover plates for packaging; according to the utility model, the bandwidth of the device can be broadened through the Y-shaped matching step, the round step is arranged on the Y-shaped matching step, and the round ferrite is directly pasted on the round step, so that the bandwidth of the device can be further broadened.

Description

Technical Field

[0001] This utility model relates to the field of isolator technology, specifically to a Ka-band full-frequency waveguide isolator. Background Technology

[0002] An isolator is a three-port device with unidirectional transmission characteristics, with the third port connected to an external load. It controls the transmission of electromagnetic waves along a certain circumferential direction. When an external bias magnetic field is applied, it generates gyromagnetic properties, causing the electromagnetic waves propagating in ferrite to undergo polarization rotation and absorb electromagnetic wave energy. It is often used for isolation between the feed and the load, eliminating the frequency drift caused by electromagnetic wave reflection. In practical applications, it can effectively improve the standing wave ratio of the entire system, protect the feed, and provide full-duplex transmission and reception. This invention particularly relates to an upper and lower cavity Ka-band product with wide usable bandwidth, low interference, and small size, widely used in satellite communications. Its short wavelength supports high-speed data transmission and high-capacity communication, suitable for high-speed mobile communications and wide coverage applications; it is also used in terrestrial mobile communications, providing high-speed data transmission and video communication applications, such as mobile terminal devices on high-speed trains and buses; and it is also widely used in aviation communications, supporting high-speed data transmission and high-definition video transmission. With the continuous development of microwave technology, the requirements for various indicators of waveguide isolators are becoming increasingly higher, and the usage environments are becoming more diversified. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a Ka-band full-band waveguide isolator. By using a Y-shaped matching step, the bandwidth of the device can be broadened. The Y-shaped matching step has a circular step, and a circular ferrite is directly attached to the circular step, which can further broaden the bandwidth of the device.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a Ka-band full-frequency waveguide isolator, comprising a waveguide isolator cavity, the waveguide isolator cavity including an upper cavity and a lower cavity, Y-shaped matching steps respectively provided in the opposite end faces of the upper cavity and the lower cavity, each branch of the Y-shaped matching step corresponding to three ports on the corresponding end faces of the upper cavity and the lower cavity, a circular step provided in the middle of the Y-shaped matching step, ferrite provided on the circular step, a load cavity provided inside the upper cavity and the lower cavity, an absorber provided inside the load cavity, the absorber being fixed in the load cavity by adhesive bonding, and the absorber being encapsulated in the load cavity by an absorber cover plate, and the absorber cover plate being fixed in a slot provided on the side of the upper and lower cavities by screws, a magnetic field cavity provided inside the upper cavity and a permanent magnet provided inside the magnetic field cavity, the permanent magnet being fixed in the magnetic field cavity by adhesive bonding, and encapsulated by a magnetic field cover plate.

[0005] This utility model further defines the technical solution as follows:

[0006] Preferably, the Y-shaped matching step is an integrated structure consisting of a first step and a second step, with a groove provided between the first step and the second step, and a circular step provided on the second step.

[0007] Preferably, the upper cavity and the lower cavity are respectively provided with corresponding positioning holes, and the two are positioned and fixed by the positioning holes and screws.

[0008] Preferably, the magnetic field cover is provided with a circular air outlet.

[0009] Preferably, the ferrite has a circular cross-section and is made of nickel-zinc material.

[0010] Preferably, the absorber is slope-shaped and made of carbonyl iron.

[0011] Preferably, the Y-shaped matching step, the magnetic field cover plate, and the cavity are made of the same material, namely metal.

[0012] The beneficial effects of this utility model are:

[0013] (1) The upper cavity and lower cavity of this utility model are provided with Y-shaped matching steps, and a groove is provided between the first step and the second step. This not only can broaden the bandwidth of the device, but also reduce the number of steps, reduce the processing difficulty, and improve the overall precision requirements.

[0014] (2) The present invention sets a circular matching step on the second step, and the ferrite is placed at the center of the circular step. This enables the ferrite 11 to be magnetized under the magnetic field of the permanent magnet 10. While ensuring the magnetization magnetic field strength of the ferrite 11, it can also effectively ensure various electrical performance indicators, and further broaden the bandwidth of the device.

[0015] (3) The ferrite of this utility model is a high-power ferrite and uses nickel-zinc ferrite material, which makes the device have the characteristics of high power and good temperature stability.

[0016] (4) The upper cavity and the lower cavity of this utility model are respectively provided with corresponding positioning holes. The two are positioned and fixed by positioning holes and screws, which not only facilitates installation and disassembly, but also effectively reduces the loss of device insertion, and at the same time reduces the processing difficulty. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is an exploded view of the structure of this utility model;

[0019] Figure 3This is a schematic diagram of the Y-shaped matching step structure in this utility model. Detailed Implementation

[0020] The technical solution of this utility model will be described in detail below, but the protection scope of this utility model is not limited to the embodiments described.

[0021] like Figure 1-3 As shown, a Ka-band full-band waveguide isolator includes a waveguide isolator cavity, which includes an upper cavity 1 and a lower cavity 2. The upper cavity and the lower cavity are respectively provided with corresponding positioning holes 3, and the two are positioned and fixed by positioning holes and screws.

[0022] Y-shaped matching steps 4 are provided in the opposite end faces of the upper cavity and the lower cavity, and each branch of the Y-shaped matching step is respectively set in three ports 5 on the corresponding end faces of the upper cavity and the lower cavity.

[0023] The Y-shaped matching step 4 is an integrated structure composed of a first step 6 and a second step 7. A groove 8 is provided between the first and second steps. A circular step 9 is provided on the second step, and a ferrite 10 is provided on the circular step. The ferrite has a circular cross-section and is made of nickel-zinc material. Load chambers 11 are provided inside the upper and lower cavities. An absorber 12 is provided in each load chamber. The absorber is fixed in the load chamber by adhesive bonding and is sealed in the load chamber by an absorber cover plate 13. The absorber 12 is sloping and is made of carbonyl iron. The absorber cover plate is fixed in the slots 18 provided on the side of the upper and lower cavities by screws. Magnetic field cavities 14 are provided inside the upper and lower cavities. Permanent magnets 15 are provided in the magnetic field cavities. The permanent magnets are fixed in the magnetic field cavities by adhesive bonding and are sealed by magnetic field cover plate 16. The magnetic field cover plate has a circular vent hole 17. The Y-shaped matching step, magnetic field cover plate and cavity are made of the same material, all of which are metal.

[0024] In this embodiment, flanges are connected to two opposite ports of the upper cavity and the lower cavity, and the flanges are perpendicular to the fitting end faces of the upper cavity and the lower cavity.

[0025] The working principle of this embodiment is as follows: The waveguide cavity adopts a Y-shaped junction structure, which is a three-terminal waveguide Y-junction isolator. The third end is connected to the load. It can be regarded as a device in which three identical waveguides are coupled to the waveguide cavity through a large coupling hole. That is, after the TE10 wave input from the first port enters the waveguide cavity, it excites the TM110 standing wave in the upper magnetic field cavity and the lower magnetic field cavity. If there is no external bias field, the ferrite will not be magnetized. The TM110 standing wave will couple an equal amount of energy at the second port and the load port. If the size of this pair of ferrites is appropriate, and the direction and magnitude of the external bias magnetic field are appropriate, the field distribution in the cavity will rotate 30° around the central axis due to the gyromagnetic effect, so that the two transverse magnetic closed curves of the standing wave in the cavity are equal in amplitude and out of phase at the load port. At this time, the microwave electromagnetic field is only coupled to the second port. Similarly, the electromagnetic wave input from the second port is only coupled to the third port. The third port is connected to the load, thereby realizing the isolation function.

[0026] In addition to the embodiments described above, this utility model may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by this utility model.

Claims

1. A Ka-band full-frequency waveguide isolator, comprising a waveguide isolator cavity, characterized in that: The waveguide isolator cavity includes an upper cavity and a lower cavity. Y-shaped matching steps are respectively provided on the opposite end faces of the upper and lower cavities. Each branch of the Y-shaped matching step is respectively located at one of the three ports on the corresponding end faces of the upper and lower cavities. A circular step is provided in the middle of the Y-shaped matching step, and ferrite is provided on the circular step. Both the upper and lower cavities have load cavities inside, and absorbers are provided within the load cavities. The absorbers are fixed in place by adhesive bonding and encapsulated within the load cavities by absorber cover plates. These absorber cover plates are fixed to slots on the sides of the upper and lower cavities by screws. Both the upper and lower cavities have magnetic field cavities inside, and permanent magnets are provided within these magnetic field cavities. The permanent magnets are fixed in place within the magnetic field cavities and encapsulated by magnetic field cover plates.

2. The Ka-band full-frequency waveguide isolator according to claim 1, characterized in that: The Y-shaped matching step is an integrated structure consisting of a first step and a second step, with a groove provided between the first step and the second step, and a circular step provided on the second step.

3. The Ka-band full-frequency waveguide isolator according to claim 1, characterized in that: The upper cavity and the lower cavity are respectively provided with corresponding positioning holes, and the two are positioned and fixed by the positioning holes and screws.

4. The Ka-band full-frequency waveguide isolator according to claim 1, characterized in that: The magnetic field cover plate is provided with a circular air outlet.

5. The Ka-band full-frequency waveguide isolator according to claim 1, characterized in that: The ferrite has a circular cross-section and is made of nickel-zinc material.

6. The Ka-band full-frequency waveguide isolator according to claim 1, characterized in that: The absorber is slope-shaped and made of carbonyl iron.

7. The Ka-band full-frequency waveguide isolator according to claim 1, characterized in that: The Y-shaped matching step, magnetic field cover plate, and cavity are made of the same material, all of which are metal.

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