High harmonic suppression circulator with defected ground structure (DGS)

Abstract

The invention discloses a high harmonic suppression circulator of a defected ground structure (DGS), which comprises a central circuit and a matching medium, the central circuit comprises a grounding plate, a ferrite substrate and a nonreciprocal junction from top to bottom, the grounding plate is provided with a grid structure etched by the DGS, and distributed capacitance and distributed inductance in circuit transmission are changed. A high-harmonic suppression circulator with a defected ground structure (DGS) plays a role in stop band, generates resonance at some frequency points, and achieves the effect of improving the harmonic suppression capability.

Description

Technical Field

[0001] The present invention relates to the field of high harmonic suppression circulators, and in particular to a high harmonic suppression circulator with a DGS defect ground structure. Background Art

[0002] With the continuous development of miniaturization and high-precision of signal systems, the internal size of RF transceiver modules is getting smaller and smaller. In the final subsystem, the space used for signal transmission is constantly compressed, and the out-of-band suppression and harmonic suppression capabilities of the final filter are getting stronger and stronger. In order to weaken the impact on the entire system caused by the reduction of the harmonic suppression capability of the filter after space compression, the circulator in the front stage of the final filter is now required to bring higher harmonic suppression. The method to improve the harmonic suppression capability of the circulator is mainly to increase the normalized internal field of the device, but it inevitably leads to the deterioration of the bandwidth, which will eventually affect the overall performance of the system. Summary of the Invention

[0003] In order to solve the technical problem of how to improve the harmonic suppression of the circulator without causing bandwidth deterioration, the present invention proposes a high harmonic suppression circulator with a DGS defective ground structure. A high-harmonic suppression circulator with a DGS defective ground structure includes a central circuit and a matching medium. The central circuit comprises, from top to bottom, a ground plate, a ferrite substrate, a non-reciprocal junction, a ferrite substrate, and a ground plate. The ground plate is provided with a grid structure etched with a DGS defective ground structure to change the distributed capacitance and distributed inductance in circuit transmission.

[0004] Among them, the function of the grounding plate is to connect the electronic equipment or electrical system to the ground wire to ensure the safety and stability of the equipment; Among them, the role of the matching medium is filtering, that is, removing the clutter signal in the circuit and improving the purity and stability of the signal; matching, that is, matching the impedance of different parts in the circuit to ensure smooth signal transmission; Among them, the role of the grid structure is to change the distributed inductance and distributed capacitance in circuit transmission, thereby achieving a stopband effect.

[0005] Furthermore, a high harmonic suppression circulator with a DGS defective ground structure is provided, wherein the number of the grid structures is 3 and the grid structures are aligned on the Y section of the circulator.

[0006] Furthermore, a high harmonic suppression circulator with a DGS defect ground structure, wherein the ferrite substrate is garnet ferrite; Among them, garnet ferrite has good magnetic properties and can show strong magnetic response under the action of external magnetic field.

[0007] Furthermore, a high harmonic suppression circulator with a DGS defect ground structure is provided, wherein the magnetization intensity of the garnet ferrite is 4πMs=1800Gs, the resonance linewidth is 16Oe, and the dielectric constant is 14.5.

[0008] Furthermore, a high harmonic suppression circulator with a DGS defective ground structure is provided, wherein the central circuit is a quasi-triangle structure.

[0009] Furthermore, a high harmonic suppression circulator with a DGS defect ground structure is provided, wherein the matching medium is ceramic and has a dielectric constant of 30.

[0010] Furthermore, a high harmonic suppression circulator with a DGS defect ground structure is provided, wherein the normalized internal field value of the high harmonic suppression circulator is 1.6, corresponding to an internal magnetic field of 563 Oe.

[0011] Furthermore, a high harmonic suppression circulator of a DGS defective ground structure is provided, wherein the high harmonic suppression circulator further includes a magnet and a temperature patch; The magnet, ground plate, ferrite substrate, central circuit, ferrite substrate, ground plate, magnet, and temperature patch are stacked and placed inside the housing from bottom to top. A grid structure with DGS defect structure etching is provided on the ground plate.

[0012] Furthermore, a high harmonic suppression circulator with a DGS defective ground structure, wherein the housing is fastened to the cover plate by threaded engagement; The various components are fastened together by means of threaded engagement between the cover plate and the housing.

[0013] Furthermore, a high harmonic suppression circulator of a DGS defect ground structure is provided, wherein the grid structure includes a periodic or non-periodic setting.

[0014] The beneficial effects of the present invention are as follows: a periodic or non-periodic grid structure is etched on the ground metal plate of the stripline using the DGS defect ground structure, thereby changing the distributed capacitance and distributed inductance on the transmission circuit, acting as a stopband, generating resonance at certain frequency points, and achieving the effect of improving the harmonic suppression capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the existing band traditional circulator.

[0016] Figure 2 It is a structural diagram of a high harmonic suppression circulator with a DGS defective ground structure.

[0017] Figure 3 This is a diagram of the internal structure of the high harmonic suppression circulator housing of the DGS defective ground structure.

[0018] In the figure, 1-center circuit, 2-matching medium, 3-ferrite substrate, 4-grid structure, 5-ground plate, 6-non-reciprocal junction, 7-magnet, 8-temperature patch, 9-cover plate. DETAILED DESCRIPTION

[0019] The present invention is further described below, but the protection scope of the present invention is not limited to the following description.

[0020] As attached Figure 1 As shown, the central circuit structure of the traditional L-band circulator is, from top to bottom, a ground plate 5, a ferrite substrate 3, a non-reciprocal junction, a ferrite substrate 3, and a ground plate 5. This design can have a good response in the L-band.

[0021] As attached Figure 2 As shown, a high-harmonic suppression circulator with a DGS defective ground structure includes a central circuit 1 and a matching medium 2. The central circuit 1 comprises, from top to bottom, a ground plate 5, a ferrite substrate 3, a non-reciprocal junction, a ferrite substrate 3, and a ground plate 5. The structure and position of its components are basically the same as those of a traditional circulator. The only difference is that a grid structure 4 with a DGS defective ground structure etched on the ground plate 5 changes the distributed capacitance and distributed inductance in circuit transmission, achieving a certain suppression and improvement effect on harmonics.

[0022] A high harmonic suppression circulator with a DGS defective ground structure, the implementation principle is as follows: Based on the traditional circulator design, three grid structures 4 are etched on the ground plate 5, and the grid structures 4 are roughly aligned on the circulator Y section to change the distributed inductance and distributed capacitance in the circuit transmission and play a stopband role.

[0023] A high harmonic suppression circulator of a DGS defective ground structure, the implementation steps are as follows: Based on the dielectric constant of the selected ferrite, the approximate size of the DGS structure is first calculated. Then, through simulation, the specific shape and size of the DGS structure and circuit structure are optimized: Step 1: Determine the basic material parameters for the circulator design based on parameters such as passband frequency, size, and power capacity. The selected ferrite substrate 3 is garnet ferrite with a magnetization intensity of 4πMs=1800Gs, a resonance linewidth of 16Oe, and a dielectric constant of 14.5. The matching medium 2 is ceramic with a dielectric constant of 30. Step 2: Determine the appropriate normalized internal field value based on the selected material and passband frequency. Set the normalized internal field value to 1.6, which corresponds to an internal magnetic field of approximately 563 Oe. Step 3: Calculate the center circuit 1 structure and adopt a triangle-like center circuit 1 structure to make the circulator respond within the required passband; Step 4: Adjust the size of the grid structure 4 to optimize the stopband frequency to the second harmonic position of the circulator operating frequency; Step 5: Use simulation software to optimize the dimensions of the central circuit 1 and the grid structure 4 so that the circulator's passband performance and out-of-band harmonic suppression capabilities meet the requirements. Step 6: As attached Figure 3 As shown, after determining the size of the central circuit 1 and the grid structure 4, referring to the simulation settings and results, the magnet 7, grounding plate 5, ferrite substrate 3, central circuit 1, ferrite substrate 3, grounding plate 5, magnet 7, and temperature patch 8 are overlapped and placed inside the shell from bottom to top in sequence, and the various components are fastened together through the threaded fit of the cover plate 9 and the shell to complete the production of the circulator.

[0024] The frequency range of this embodiment is 999-1121 MHz. In actual design, the frequency range can be modified as long as the calculation circuit and DGS structure meet the requirements. The DGS structure in this embodiment has only one resonant point. A grid can also be added to make the DGS structure respond at the circulator's third harmonic frequency, thereby achieving the effect of multi-harmonic suppression.

[0025] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high harmonic suppression circulator with a DGS defect ground structure, comprising a central circuit (1) and a matching medium (2), wherein the central circuit (1) comprises, from top to bottom, a ground plate (5), a ferrite substrate (3), a non-reciprocal junction (6), a ferrite substrate (3), and a ground plate (5), characterized in that: The ground plate (5) is provided with a grid structure (4) etched with a DGS defect ground structure, which changes the distributed capacitance and distributed inductance in circuit transmission.

2. The high harmonic suppression circulator of the DGS defective ground structure according to claim 1, characterized in that: The number of the grid structures (4) is 3, and the grid structures (4) are aligned on the Y section of the circulator.

3. The high harmonic suppression circulator of the DGS defective ground structure according to claim 1, characterized in that: The ferrite substrate (3) is garnet ferrite.

4. The high harmonic suppression circulator of the DGS defective ground structure according to claim 3, characterized in that: The magnetization intensity of the garnet ferrite is 4πMs=1800Gs, the resonance line width is 16Oe, and the dielectric constant is 14.

5.

5. The high harmonic suppression circulator of the DGS defective ground structure according to claim 1, characterized in that: The central circuit (1) is a triangular-like structure.

6. The high harmonic suppression circulator of the DGS defective ground structure according to claim 1, characterized in that: The matching medium (2) is ceramic, and has a dielectric constant of 30.

7. The high harmonic suppression circulator of the DGS defective ground structure according to claim 1, characterized in that: The normalized internal field value of the high harmonic suppression circulator is 1.6, corresponding to an internal magnetic field of 563 Oe.

8. The high harmonic suppression circulator of the DGS defective ground structure according to claim 1, characterized in that: The high harmonic suppression circulator further includes a magnet (7) and a temperature patch (8); The magnet (7), ground plate (5), ferrite substrate (3), central circuit (1), ferrite substrate (3), ground plate (5), magnet (7), and temperature patch (8) are sequentially stacked and placed inside the housing from bottom to top.

9. The high harmonic suppression circulator of the DGS defective ground structure according to claim 8, characterized in that: The housing is fastened by threaded engagement with the cover plate (9).

10. The high harmonic suppression circulator of the DGS defective ground structure according to claim 1, characterized in that: The grid structure (4) comprises a periodic or aperiodic arrangement.

Images