Waveguide isolator

Abstract

The utility model provides a waveguide isolator which comprises a waveguide cavity, ferrite and a ceramic chip, the ferrite and the ceramic chip are both installed in the waveguide cavity, and one side of the ferrite is connected with the ceramic chip. By utilizing the advantages of good heat resistance and high breakdown voltage of ceramic, the defects of low absorption loss, low breakdown voltage and insufficient heat resistance of the existing resin composite material taking base iron powder as a wave absorbing agent are overcome, and the ceramic is adopted as an absorber. In practical application, various electrical properties can be effectively improved, the consistency can be ensured, and the reflection power is improved. Parts are easy and convenient to install, electrical performance consistency can be free of adjustment, and power resistance is high.

Description

Technical Field

[0001] The utility model relates to the technical field of isolators, in particular to a waveguide isolator. Background Art

[0002] The isolator is a device with microwave unidirectional transmission characteristics. It controls the transmission of electromagnetic waves in a certain direction and is an indispensable component of various microwave subsystems. When an external bias magnetic field is applied, gyromagnetic characteristics are generated, causing the electromagnetic waves propagating in the ferrite to undergo polarization rotation and absorb electromagnetic wave energy. It is often used to isolate the feed source from the load and eliminate the effects of frequency drift caused by electromagnetic wave reflection. The function of the absorption load is to absorb excess microwaves and stabilize the system signal. It is a key material for the isolator. The electrical properties of the isolator depend on the characteristics of the absorption load. The current absorption load mostly uses a composite of magnetic metal powder and organic resin. Due to the low absorption loss and poor thermal stability of the resin material, the performance of the absorber is greatly limited. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a waveguide isolator in view of the deficiencies of the prior art.

[0004] The utility model provides a technical solution to the above technical problem as follows: a waveguide isolator, comprising: a waveguide cavity, a ferrite, and a ceramic sheet, wherein the ferrite and the ceramic sheet are both installed in the waveguide cavity, and one side of the ferrite is connected to the ceramic sheet.

[0005] The beneficial effects of the technical solution of the utility model are: utilizing the advantages of good heat resistance and high breakdown voltage of ceramics to overcome the weaknesses of low absorption loss, low breakdown voltage and insufficient heat resistance of the resin composite material with base iron powder as the absorber, and using ceramics as the absorber. In practical application, it can effectively improve various electrical properties and ensure consistency, and increase reflected power. The parts are easy to install, the consistency of electrical performance can be achieved without adjustment, and the power resistance is strong.

[0006] Furthermore, a matching block is connected to the other side of the ferrite, and the matching block is located at the top center of the waveguide cavity. Both ends of the matching block and both ends of the ceramic sheet are provided with bevels.

[0007] The beneficial effect of adopting the above further technical solution is that the matching block optimizes the standing wave coefficient of the X-band isolator and also widens the frequency.

[0008] Furthermore, the inclination angle of the bevel is 20°, the matching block is a copper-silver-plated matching block, and the matching block is welded in the waveguide cavity.

[0009] The beneficial effects of adopting the above further technical solution are: the copper-silver-plated matching block enhances the device performance, improves the signal transmission quality, and has strong corrosion resistance. The angled design of the bevel optimizes the standing wave coefficient of the X-band isolator and can also widen the frequency.

[0010] Furthermore, the waveguide cavity comprises: an upper cavity and a lower cavity, the upper cavity is connected to the lower cavity by bolts, and the ceramic sheet is installed in the lower cavity.

[0011] The beneficial effect of adopting the above further technical solution is: adopting a split waveguide cavity, fixing the upper cavity and the lower cavity by screw fastening, which is convenient for installation and disassembly, and can also effectively reduce the loss of device insertion.

[0012] Furthermore, strip-shaped grooves are provided on both sides of the interior of the lower cavity, and the ceramic sheets are installed in the strip-shaped grooves.

[0013] The beneficial effect of adopting the above further technical solution is that the provision of the strip-shaped groove facilitates the stable installation of the ceramic sheet, prevents the ceramic sheet from shaking, and improves the stability and reliability of the waveguide isolator.

[0014] Furthermore, flanges are provided at both ends of the upper cavity and the lower cavity, and connecting holes are provided on the flanges.

[0015] The beneficial effect of adopting the above further technical solution is that connection holes are respectively opened on the flange plate for integrally fixing the waveguide circulator.

[0016] Furthermore, the ferrite is a rectangular structure, the ferrite is located at the center of the ceramic sheet, and the ferrite is a lithium ferrite material.

[0017] The beneficial effect of adopting the above further technical solution is that the device has the characteristics of high power and good temperature stability. The ferrite is located at the center of the ceramic sheet, which can ensure that when the ferrite is magnetized under the magnetic field of the permanent magnet, the ferrite magnetization magnetic field strength is ensured while effectively ensuring various electrical performance indicators. The ferrite is a rectangular ferrite, and a high-power, high Curie temperature material is used, so that the device has the characteristics of high power and good temperature stability.

[0018] Furthermore, the outer side of the waveguide cavity is covered with a magnetic circuit, the magnetic circuit is a U-shaped structure, permanent magnets are respectively arranged on both sides of the inside of the magnetic circuit, the permanent magnets are rectangular structures, and the positions of the permanent magnets correspond to the positions of the ferrites.

[0019] The beneficial effect of adopting the above further technical solution is that the permanent magnet has a strong magnetic field strength, which can ensure that when the ferrite is magnetized under the magnetic field of the permanent magnet, the magnetic field strength of the ferrite magnetization is ensured, and various electrical performance indicators can be effectively guaranteed.

[0020] Furthermore, the waveguide cavity is a copper-silver-plated I-type structure.

[0021] The beneficial effect of adopting the above further technical solution is: the copper-silver-plated waveguide cavity enhances the performance of the device, improves the signal transmission quality, and has strong corrosion resistance. The waveguide cavity adopts an I-junction structure, which is a two-end waveguide isolator. The ferrite produces different field shift effects on the waveforms transmitted in two directions. The ceramic sheet close to the ferrite can be regarded as an absorption sheet. Due to the different deviations caused by the transmission in two directions, the electric field of the forward transmission wave is biased to the side without the attenuation sheet, while the electric field of the reverse transmission wave is biased to the side of the absorption sheet, thereby realizing the isolation function with very small forward attenuation and large reverse attenuation.

[0022] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is one of the structural schematic diagrams of the waveguide isolator provided in an embodiment of the utility model.

[0024] Figure 2 The second structural schematic diagram of the waveguide isolator provided in the embodiment of the utility model.

[0025] Explanation of the accompanying drawings: 1. upper cavity; 2. matching block; 3. ferrite; 4. ceramic sheet; 5. strip groove; 6. lower cavity; 7. permanent magnet; 8. magnetic circuit; 9. waveguide cavity. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0027] like Figure 1 and Figure 2 As shown, a waveguide isolator provided by an embodiment of the utility model includes: a waveguide cavity 9, a ferrite 3, and a ceramic sheet 4. The ferrite 3 and the ceramic sheet 4 are both installed in the waveguide cavity 9, and one side of the ferrite 3 is connected to the ceramic sheet 4.

[0028] The beneficial effects of the technical solution of the utility model are: utilizing the advantages of good heat resistance and high breakdown voltage of ceramics to overcome the weaknesses of low absorption loss, low breakdown voltage and insufficient heat resistance of the resin composite material with base iron powder as the absorber, and using ceramics as the absorber. In practical application, it can effectively improve various electrical properties and ensure consistency, and increase reflected power. The parts are easy to install, the consistency of electrical performance can be achieved without adjustment, and the power resistance is strong.

[0029] In order to overcome the deficiencies in the prior art and improve the reflected power, the utility model provides a waveguide isolator, which can be an X-band waveguide isolator. The waveguide cavity is formed by arranging a copper block (matching block) at the center of an upper cavity 1, arranging a ceramic sheet 4 and a ferrite 3 on a lower cavity 6, and a magnetic circuit 8 is arranged outside the waveguide cavity, and a permanent magnet 7 is arranged inside the magnetic circuit 8.

[0030] In the first aspect, the X-band waveguide isolator (waveguide isolator) provided by the utility model includes: the waveguide cavity is copper-plated with silver, and a matching block 2, a ceramic sheet 4 and a ferrite 3 are arranged in the waveguide cavity. A strip groove 5 is opened in the lower cavity 6 to accommodate a ceramic sheet 4. A magnetic circuit 8 is opened on one side of the lower cavity 6, and a permanent magnet 7 is respectively accommodated on both sides of the magnetic circuit 8. The waveguide cavity has an I-shaped structure, and the waveguide cavity includes: an upper cavity 1, and a lower cavity 6 corresponding to the upper cavity 1 above and below and fixed by a plurality of screws (which can also be bolts).

[0031] The depth of the strip grooves 5 of the lower cavity 6 corresponds to the thickness of the ceramic sheet 4 , and the strip grooves 5 are arranged as a group on both sides of the lower cavity 6 .

[0032] The matching block 2 is made of silver-plated copper and is installed at the center of the upper cavity 1 by welding.

[0033] The matching block 2 includes: two sides of the matching block 2 are cut at a 20° bevel.

[0034] The ceramic sheet 4 includes: two sides of the ceramic sheet 4 are cut at a 20° bevel.

[0035] The ferrite 3 includes: the ferrite 3 is in a rectangular shape, and the ferrite 3 is placed on a ceramic sheet 4 .

[0036] The magnetic circuit 8 is U-shaped, and the permanent magnet 7 is rectangular, has a strong magnetic field strength, and is fixed by bonding.

[0037] The upper cavity 1 and the lower cavity 6 are connected with a flange, and the flange is vertically arranged with the matching end faces of the upper cavity 1 and the lower cavity 6, and the flange is respectively provided with connecting holes.

[0038] 1. By using ceramics (ceramic sheets) as absorbers in the upper and lower cavities, the advantages of good heat resistance and high breakdown voltage are overcome to overcome the weaknesses of low absorption loss, low breakdown voltage and insufficient heat resistance of the current resin composite materials using base iron powder as absorbers.

[0039] 2. A copper-silver-plated matching block 2 is provided at the center of the upper cavity 1, so that the standing wave coefficient of the X-band isolator (waveguide isolator) can be optimized and the frequency can be widened.

[0040] 3. Ferrite 3 is a rectangular high-power ferrite, and uses lithium ferrite material, so that the device (waveguide isolator) has the characteristics of high power and good temperature stability.

[0041] 4. A split waveguide cavity is used, and the upper cavity 1 and the lower cavity 6 are fixed by screws, which is convenient for installation and disassembly, and can also effectively reduce the loss of device insertion.

[0042] 5. The upper cavity 1, the lower cavity 6 and the matching block 2 are all copper-plated with silver, which enhances the performance of the device, improves the signal transmission quality, and has strong corrosion resistance.

[0043] like Figure 1 and Figure 2 As shown, further, the other side of the ferrite 3 is connected to a matching block 2, and the matching block 2 is located at the top center of the waveguide cavity 9. Both ends of the matching block 2 and both ends of the ceramic sheet 4 are provided with bevels.

[0044] The beneficial effect of adopting the above further technical solution is that the matching block optimizes the standing wave coefficient of the X-band isolator and also widens the frequency.

[0045] like Figure 1 and Figure 2 As shown, further, the inclination angle of the bevel is 20°, the matching block 2 is a copper-silver-plated matching block, and the matching block 2 is welded in the waveguide cavity 9.

[0046] The beneficial effects of adopting the above further technical solution are: the copper-silver-plated matching block enhances the device performance, improves the signal transmission quality, and has strong corrosion resistance. The angled design of the bevel optimizes the standing wave coefficient of the X-band isolator and can also widen the frequency.

[0047] like Figure 1 and Figure 2 As shown, further, the waveguide cavity 9 includes: an upper cavity 1 and a lower cavity 6 , the upper cavity 1 is connected to the lower cavity 6 by bolts, and the ceramic sheet 4 is installed in the lower cavity 6 .

[0048] The beneficial effect of adopting the above further technical solution is: adopting a split waveguide cavity, fixing the upper cavity and the lower cavity by screw fastening, which is convenient for installation and disassembly, and can also effectively reduce the loss of device insertion.

[0049] The waveguide isolator provided in the embodiment of the present utility model can be applied in, but not limited to, the X-band and the K-band.

[0050] The X-band waveguide isolator (waveguide isolator) comprises an upper cavity 1, a lower cavity 6, a ceramic sheet 4, a ferrite 3, a matching block 2, a magnetic circuit 8, and a permanent magnet 7. The waveguide cavity 9 comprises an upper cavity (upper cavity) and a lower cavity (lower cavity) corresponding to each other. The upper cavity (upper cavity) is provided with a copper block (matching block), the lower cavity (lower cavity) is provided with a ceramic sheet 4, the ceramic sheet 4 is provided with a ferrite 3, the outside of the waveguide cavity is provided with a magnetic circuit 8, and the inside of the magnetic circuit 8 is provided with a permanent magnet 7. The X-band waveguide isolator (waveguide isolator) of the utility model has easy installation of parts, electrical performance consistency that can be adjusted without adjustment, and strong power resistance.

[0051] In the waveguide cavity, a matching block 2 is arranged in the waveguide upper cavity (upper cavity), a ceramic sheet 4 is in the lower cavity 6, the ceramic sheet 4 is provided with a ferrite 3, a magnetic circuit 8 is provided outside the cavity, a permanent magnet 7 is provided in the magnetic circuit 8, the permanent magnet 7 is accommodated in the magnetic circuit 8, the magnetic circuit 8 is clamped on one side of the waveguide cavity, and the magnetic circuit is fixed to the waveguide cavity by bonding.

[0052] The waveguide cavity is in an I-shaped structure and is made of copper plated with silver. The waveguide cavity includes an upper cavity 1 and a lower cavity 6 corresponding to the upper cavity 1 and fixed by a plurality of screws.

[0053] The matching block 2 is correspondingly arranged on the upper cavity 1 , and the matching block 2 is arranged at the center position of the upper cavity 1 .

[0054] The ceramic sheet 4 is correspondingly arranged on the lower cavity 6, and the lower cavity 6 is provided with a strip-shaped groove (strip-shaped groove 5). The ceramic sheet 4 is arranged in the groove (strip-shaped groove 5) of the lower cavity 6. The ceramic sheet 4 is fixed in the groove (strip-shaped groove 5) of the lower cavity 6 by bonding.

[0055] The ferrite 3 is correspondingly arranged on the ceramic sheet 4 , and the ferrite 3 is arranged at the center of the ceramic sheet 4 .

[0056] The waveguide cavity is made of copper-plated silver material.

[0057] The waveguide cavity is divided into an upper cavity 1 and a lower cavity 6 and fixed with screws.

[0058] The matching block 2 is made of copper-plated silver material.

[0059] The two ends of the matching block 2 are beveled at 20°.

[0060] The matching block is fixed at the center of the upper cavity 1 by welding.

[0061] The two ends of the ceramic sheet 4 are cut at a 20° bevel.

[0062] The ferrite 3 is square or rectangular and is fixed in the middle of the ceramic sheet 4 by bonding.

[0063] The magnetic circuit 8 is U-shaped. The permanent magnets 7 are bonded to the inner sides of both ends of the U-shaped magnetic circuit (magnetic circuit).

[0064] The permanent magnet 7 is a square permanent magnet or a rectangular permanent magnet.

[0065] The magnetic circuit is fixed to the side surface of the lower cavity 6 by bonding.

[0066] like Figure 1 and Figure 2 As shown, further, strip grooves 5 are provided on both sides of the interior of the lower cavity 6 , and the ceramic sheets 4 are installed in the strip grooves 5 .

[0067] The beneficial effect of adopting the above further technical solution is that the provision of the strip-shaped groove facilitates the stable installation of the ceramic sheet, prevents the ceramic sheet from shaking, and improves the stability and reliability of the waveguide isolator.

[0068] like Figure 1 and Figure 2 As shown, further, both ends of the upper cavity 1 and the lower cavity 6 are provided with flanges, and the flanges are provided with connecting holes.

[0069] The beneficial effect of adopting the above further technical solution is that connection holes are respectively opened on the flange plate for integrally fixing the waveguide circulator.

[0070] like Figure 1 and Figure 2 As shown, further, the ferrite 3 is a rectangular structure, the ferrite 3 is located at the center of the ceramic sheet 4, and the ferrite 3 is a lithium ferrite material.

[0071] The beneficial effect of adopting the above further technical solution is that the device has the characteristics of high power and good temperature stability. The ferrite is located at the center of the ceramic sheet, which can ensure that when the ferrite is magnetized under the magnetic field of the permanent magnet, the ferrite magnetization magnetic field strength is ensured while effectively ensuring various electrical performance indicators. The ferrite is a rectangular ferrite, and a high-power, high Curie temperature material is used, so that the device has the characteristics of high power and good temperature stability.

[0072] like Figure 1 and Figure 2As shown, further, the outer side of the waveguide cavity 9 is covered with a magnetic circuit 8, and the magnetic circuit 8 is a U-shaped structure. Permanent magnets 7 are respectively provided on both sides of the inside of the magnetic circuit 8, and the permanent magnets 7 are rectangular structures. The positions of the permanent magnets 7 correspond to the positions of the ferrites 3.

[0073] The beneficial effect of adopting the above further technical solution is that the permanent magnet has a strong magnetic field strength, which can ensure that when the ferrite is magnetized under the magnetic field of the permanent magnet, the magnetic field strength of the ferrite magnetization is ensured, and various electrical performance indicators can be effectively guaranteed.

[0074] like Figure 1 and Figure 2 As shown, further, the waveguide cavity 9 is a copper-silver-plated I-type structure.

[0075] The beneficial effect of adopting the above further technical solution is: the copper-silver-plated waveguide cavity enhances the performance of the device, improves the signal transmission quality, and has strong corrosion resistance. The waveguide cavity adopts an I-junction structure, which is a two-end waveguide isolator. The ferrite produces different field shift effects on the waveforms transmitted in two directions. The ceramic sheet close to the ferrite can be regarded as an absorption sheet. Due to the different deviations caused by the transmission in two directions, the electric field of the forward transmission wave is biased to the side without the attenuation sheet, while the electric field of the reverse transmission wave is biased to the side of the absorption sheet, thereby realizing the isolation function with very small forward attenuation and large reverse attenuation.

[0076] A waveguide isolator provided by the utility model can be an X-band waveguide isolator, including a waveguide cavity and a ferrite 3. The waveguide cavity includes an upper cavity 1 and a lower cavity 6 corresponding to each other. A matching block 2 is provided at the center of the upper cavity 1, and strip grooves 5 are provided on both sides of the lower cavity 6. A ceramic sheet 4 is provided in the strip groove 5, and a ferrite 3 is provided on the surface of the ceramic sheet 4.

[0077] Furthermore, the matching block 2 is a copper-plated silver metal matching block with 20° bevels cut at both ends, and is respectively arranged at the center of the upper cavity 1.

[0078] Furthermore, the ceramic sheet 4 is an absorption material with a high dielectric constant and cut at two ends at an angle of 20°, and is arranged in the strip groove 5 of the lower cavity 6.

[0079] Furthermore, the ferrite 3 is placed at the center of the ceramic sheet 4 .

[0080] It is also possible to ensure that when the ferrite 3 is magnetized under the magnetic field of the permanent magnet 7, various electrical performance indicators can be effectively guaranteed while ensuring the intensity of the magnetizing magnetic field of the ferrite 3.

[0081] Furthermore, the ferrite 3 is a rectangular ferrite and is made of high-power, high Curie temperature material, so that the device has the characteristics of high power and good temperature stability.

[0082] Furthermore, the sides, top and bottom of the upper cavity 1 and the lower cavity 6 are encapsulated with magnetic circuits 8 .

[0083] Furthermore, permanent magnets 7 are respectively disposed inside both ends of the magnetic circuit 8 .

[0084] The magnetic circuit group includes: a magnetic circuit 8 clamped in the lower cavity 6, permanent magnets 7 at the inner edges of both ends of the magnetic circuit 8, and the distance between the permanent magnets 7 is equal to the outer dimension distance of the lower cavity 6; when the magnetic circuit 8 and the permanent magnet 7 encapsulate the upper cavity 1 and the lower cavity 6, the permanent magnet 7 covers the ferrite 3, so that the ferrite 3 is fully magnetized.

[0085] Furthermore, the upper cavity 1 and the lower cavity 6 are fixed by screws, and a split waveguide cavity is adopted. The upper cavity 1 and the lower cavity 6 are fixed by screws, which is convenient for installation and disassembly and can effectively reduce the loss of device insertion.

[0086] Furthermore, the two ports of the upper cavity 1 and the lower cavity 6 are respectively connected with flanges, and the flanges are vertically arranged with the adapting end faces of the upper cavity 1 and the lower cavity 6, and the flanges are respectively provided with connecting holes for the overall fixation of the waveguide circulator.

[0087] The waveguide cavity adopts an I-shaped junction structure, which is a two-end waveguide isolator. The ferrite produces different field shift effects on the waveforms transmitted in two directions. The ceramic sheet close to the ferrite can be regarded as an absorber. Due to the different deviations caused by the transmission in two directions, the electric field of the forward transmission wave is biased to the side without the attenuation sheet, while the electric field of the reverse transmission wave is biased to the side of the absorber, thereby realizing the isolation function with very small forward attenuation and large reverse attenuation.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A waveguide isolator, It is characterized in that include: A waveguide cavity, a ferrite, and a ceramic sheet. The ferrite and the ceramic sheet are both installed in the waveguide cavity, and one side of the ferrite is connected to the ceramic sheet.

2. A waveguide isolator according to claim 1, It is characterized in that The other side of the ferrite is connected with a matching block, and the matching block is located at the top center of the waveguide cavity. Both ends of the matching block and both ends of the ceramic sheet are provided with bevels.

3. A waveguide isolator according to claim 2, It is characterized in that The inclination angle of the bevel is 20°, the matching block is a copper-silver-plated matching block, and the matching block is welded in the waveguide cavity.

4. A waveguide isolator according to claim 1, It is characterized in that The waveguide cavity comprises an upper cavity and a lower cavity, the upper cavity is connected to the lower cavity by bolts, and the ceramic sheet is installed in the lower cavity.

5. A waveguide isolator according to claim 4, It is characterized in that Strip grooves are arranged on both sides of the interior of the lower cavity, and the ceramic sheets are installed in the strip grooves.

6. A waveguide isolator according to claim 4, It is characterized in that Both ends of the upper cavity and the lower cavity are provided with flanges, and the flanges are provided with connecting holes.

7. A waveguide isolator according to claim 1, It is characterized in that The ferrite is a rectangular structure, the ferrite is located at the center of the ceramic sheet, and the ferrite is a lithium ferrite material.

8. A waveguide isolator according to claim 1, It is characterized in that The outer side of the waveguide cavity is covered with a magnetic circuit, which is a U-shaped structure. Permanent magnets are respectively arranged on both sides of the inner side of the magnetic circuit, which are rectangular structures. The positions of the permanent magnets correspond to the positions of the ferrites.

9. A waveguide isolator according to claim 1, It is characterized in that The waveguide cavity is a copper-silver-plated I-type structure.

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