Linear ceramic waveguide filter and bent ceramic waveguide filter thereof

Abstract

The utility model relates to the technical field of wireless communication, in particular to a linear ceramic waveguide filter and a bent ceramic waveguide filter thereof. The linear ceramic waveguide filter comprises a port waveguide, a strip-shaped waveguide, a first-class rectangular waveguide and a second-class rectangular waveguide, a containing groove is formed in the port waveguide, and the strip-shaped waveguide, the first-class rectangular waveguide and the second-class rectangular waveguide are sequentially arranged in the containing groove; resonant cavities and flanges which are communicated with the accommodating grooves and are coaxial are arranged on the strip-shaped waveguide, the first-class rectangular waveguide and the second-class rectangular waveguide; an adjusting and coordinating block is arranged in each flange; and ceramic is filled in each resonant cavity. The bent ceramic waveguide filter comprises the linear ceramic waveguide filters which are arranged on the two sides of a bent waveguide. According to the utility model, the anti-pressure capability is improved, the cross zero point can be flexibly changed, and the bending installation requirement can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless communication, in particular to a linear ceramic waveguide filter and a curved ceramic waveguide filter. Background Art

[0002] Filters are indispensable electronic components in microwave communication systems, and their performance determines the quality of the communication system. With the advent of 5G communication technology, the number of 5G base station antenna ports has increased from the traditional 8 ports to 64 ports and 128 ports, which has greatly increased the demand for filters. Therefore, small-volume, lightweight, and high-performance filters have emerged. The dielectric waveguide filter combines the excellent performance of the cavity filter and the traditional dielectric filter, making it the best choice for 5G communication equipment.

[0003] Traditional dielectric waveguide filters are air-filled metal cavity structures, and the metal edges play the role of electromagnetic shielding and structural support. However, the large size and weight of these traditional dielectric waveguide filters can no longer meet the requirements of miniaturization and lightweighting of 5G base stations.

[0004] With the improvement of dielectrics, existing dielectric waveguide filters are filled and pressed with high dielectric constant ceramic materials to play the role of electromagnetic wave conduction and structural support. At the same time, the resonator made of ceramic powder materials has the advantages of small size, easy circuit integration, high temperature stability, and no frequency restrictions in use. However, due to its structure, the dielectric waveguide filter filled with high dielectric constant ceramic materials cannot flexibly change the crossover zero point like the dielectric waveguide filter with traditional metal cavity structure; in addition, the use of ceramic materials for filling and pressing leads to a weakened pressure resistance and easy breakage.

[0005] In summary, it is necessary to provide a linear ceramic waveguide filter and a curved ceramic waveguide filter that can flexibly change the crossover zero point and have strong pressure resistance to solve the problems existing in the prior art. Utility Model Content

[0006] The utility model aims to provide a linear ceramic waveguide filter and a curved ceramic waveguide filter. The specific technical scheme is as follows:

[0007] In a first aspect, the utility model provides a linear ceramic waveguide filter, comprising a port waveguide, a strip waveguide, a first type of rectangular waveguide and a second type of rectangular waveguide; a receiving groove is arranged on the port waveguide, and the strip waveguide, the first type of rectangular waveguide and the second type of rectangular waveguide are arranged in the receiving groove in sequence; a resonant cavity and a flange that are connected to the receiving groove and coaxial are arranged on the strip waveguide, the first type of rectangular waveguide and the second type of rectangular waveguide; a tuning block is arranged in each of the flanges; a dielectric material is filled in each of the resonant cavities; and the dielectric material comprises ceramics.

[0008] Optionally, the ceramics filled in each of the resonant cavities form a Möbius ring structure.

[0009] Optionally, the linear ceramic waveguide filter further comprises a tuning screw which can be screwed in and out at the center position of each resonant cavity.

[0010] Optionally, the tuning block includes stacked metal sheets.

[0011] Optionally, rolled steel strips are arranged between adjacent metal sheets in the tuning block.

[0012] Optionally, the flange arranged on the strip waveguide is arranged close to the first type rectangular waveguide and is accommodated in the resonant cavity of the first type rectangular waveguide.

[0013] Optionally, the flange arranged on the first type rectangular waveguide is arranged close to the second type rectangular waveguide and is accommodated in the resonant cavity of the second type rectangular waveguide.

[0014] Optionally, buffer pads are provided on the inner wall and the outer wall of each flange.

[0015] In a second aspect, the utility model provides a curved ceramic waveguide filter, comprising a curved waveguide and the linear ceramic waveguide filter; the linear ceramic waveguide filters are arranged on both sides of the curved waveguide; the curved waveguide is arranged on a side of the second type of rectangular waveguide away from the first type of rectangular waveguide; a resonant curved cavity is arranged on the curved waveguide; and air is filled in the resonant curved cavity.

[0016] Optionally, the flange arranged on the second-type rectangular waveguide is arranged close to the curved waveguide and is accommodated in the resonant curved cavity of the curved waveguide.

[0017] The application of the technical solution of the utility model has at least the following beneficial effects:

[0018] (1) The utility model provides a linear ceramic waveguide filter and a curved ceramic waveguide filter, wherein a tuning block is arranged in each flange, that is, the flange is used to wrap the tuning block so that the entire waveguide (including the strip waveguide, the first type of rectangular waveguide and the second type of rectangular waveguide) will not be deformed during heavy pressure, which greatly improves the pressure resistance, so that the linear ceramic waveguide filter and the curved waveguide filter as a whole can maintain signal transmission under a complex pressure resistance working environment.

[0019] (2) In the utility model, the ceramics filled in each of the resonant cavities form a Möbius ring structure, and the Möbius ring structure is used to change the position of the crossover zero point, so that the linear ceramic waveguide filter and the curved ceramic waveguide filter can generate a maximum of the same number of crossover zero points as the order; the tuning screw can be screwed in and out at the center of each of the resonant cavities, and the resonant frequency of the linear ceramic waveguide filter and the curved ceramic waveguide filter can be changed by screwing the tuning screw in and out, thereby flexibly changing the crossover zero point.

[0020] (3) The tuning block in the present invention includes stacked metal sheets; a rolled steel wire is arranged between adjacent metal sheets in the tuning block; the tuning block with such a specific structure is convenient for signal transmission on the one hand, and convenient for reducing the resonant wavelength on the other hand, thereby reducing the structural dimensions of the linear ceramic waveguide filter and the curved ceramic waveguide filter, and can meet the requirements of 5G base stations for miniaturization of waveguide filters.

[0021] (4) The utility model provides a curved ceramic waveguide filter that can meet the curved installation requirements of actual application scenarios.

[0022] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0024] Figure 1 This is a schematic structural diagram of a linear ceramic waveguide filter according to Embodiment 1 of the present utility model;

[0025] Figure 2 This is a schematic structural diagram of a curved ceramic waveguide filter according to Embodiment 2 of the present utility model;

[0026] Among them, 1. Port waveguide, 1.1. Receiving groove, 2. Strip waveguide, 3. First type rectangular waveguide, 4. Second type rectangular waveguide, 5. Resonant cavity, 6. Flange, 7. Tuning block, 8. Möbius ring structure, 9. Tuning screw, 10. Bent waveguide. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0028] Embodiment 1:

[0029] See also Figure 1 A linear ceramic waveguide filter, comprising a port waveguide 1, a strip waveguide 2, a first type rectangular waveguide 3 and a second type rectangular waveguide 4; a receiving groove 1.1 is arranged on the port waveguide 1, and the strip waveguide 2, the first type rectangular waveguide 3 and the second type rectangular waveguide 4 are detachably arranged in the receiving groove 1.1 by bolts in sequence; a resonant cavity 5 and a flange 6 which are connected to the receiving groove 1.1 and are coaxial are arranged on the strip waveguide 2, the first type rectangular waveguide 3 and the second type rectangular waveguide 4; a tuning block 7 is arranged in each flange 6, that is, the flange 6 is used to wrap the tuning block 7 so that the wave can be retracted during the heavy pressure process. The guide as a whole (including the strip waveguide 2, the first type of rectangular waveguide 3 and the second type of rectangular waveguide 4) will not be deformed, which greatly improves the pressure resistance, so that the linear waveguide filter as a whole can maintain signal transmission under a complex pressure-resistant working environment; the flange 6 arranged on the strip waveguide 2 is arranged close to the first type of rectangular waveguide 3 and is accommodated in the resonant cavity 5 of the first type of rectangular waveguide 3; the flange 6 arranged on the first type of rectangular waveguide 3 is arranged close to the second type of rectangular waveguide 4 and is accommodated in the resonant cavity 5 of the second type of rectangular waveguide 4; each of the resonant cavities 5 is filled with a dielectric material; the dielectric material is ceramic.

[0030] The ceramics filled in each of the resonant cavities 5 form a Möbius ring structure 8. The Möbius ring structure 8 is used to form an independent and mutually influencing loop. Since the Möbius ring has no difference between the front and back sides, the multiple signals flowing into the Möbius ring structure 8 cancel each other out due to opposite phases to generate a crossover zero point. At this time, the crossover zero point is not restricted by the frequency of a special signal. At the same time, the closed loop of the Möbius ring facilitates the signal to meet when it flows. Even if the signal sources of different frequencies cannot be completely eliminated due to different powers, the remaining signal sources to be eliminated will encounter the remaining signal sources on the Möbius ring, thereby changing the generation position of the crossover zero point, so that the linear ceramic waveguide filter can generate at most the same number of crossover zero points as the number of orders.

[0031] The linear ceramic waveguide filter also includes a tuning screw 9 that can be screwed in and out at the center of each resonant cavity 5. The resonant frequency of the linear ceramic waveguide filter can be changed by screwing the tuning screw 9 in and out, thereby flexibly changing the crossover zero point.

[0032] The tuning block 7 includes stacked metal sheets; a rolled steel sheet (not shown) is arranged between adjacent metal sheets in the tuning block 7. The tuning block 7 with this specific structure is convenient for signal transmission on the one hand, and convenient for reducing the resonant wavelength on the other hand, thereby reducing the structural size of the linear ceramic waveguide filter.

[0033] Buffer pads (such as rubber strips, not shown in the figure) are arranged on the inner wall and the outer wall of each flange 6 to reduce the wear of the tuning block 7, the first type rectangular waveguide 3 and the second type rectangular waveguide 4.

[0034] Embodiment 2:

[0035] See also Figure 2 On the basis of the linear ceramic waveguide filter described in Example 1, according to the bending installation requirements of the actual application scenario, the linear ceramic waveguide filter needs to add a curved waveguide 10. Specifically, the curved ceramic waveguide filter also includes a curved waveguide 10, and the linear ceramic waveguide filter described in Example 1 is arranged on both sides of the curved waveguide 10; the curved waveguide 10 is arranged on the side of the second type rectangular waveguide 4 away from the first type rectangular waveguide 3; a resonant curved cavity (not shown in the figure) is arranged on the curved waveguide 10; air is filled in the resonant curved cavity to form an evanescent mode waveguide; the flange 6 arranged on the second type rectangular waveguide 4 is arranged close to the curved waveguide 10 and is accommodated in the resonant curved cavity of the curved waveguide 10; buffer pads (such as rubber strips) are arranged on the inner wall and the outer wall of the flange 6 to reduce the wear of the tuning block 7 and the curved waveguide 10.

[0036] The linear ceramic waveguide filter described in Example 1 and the curved ceramic waveguide filter described in Example 2 both adopt the following working principle:

[0037] The ceramics filled in each of the resonant cavities 5 form a Möbius ring structure 8, and the Möbius ring structure 8 is used to change the generation position of the crossover zero point, so that the linear ceramic waveguide filter and the curved ceramic waveguide filter can generate a maximum of the same number of crossover zero points as the order number; the resonant frequency of the linear ceramic waveguide filter and the curved ceramic waveguide filter is changed by screwing in and out the tuning screw 9, thereby flexibly changing the crossover zero point; the flange 6 is used to wrap the tuning block 7 so that the waveguide as a whole will not be deformed during the heavy pressure process, which greatly improves the pressure resistance, so that the linear ceramic waveguide filter and the curved waveguide filter as a whole can maintain signal transmission under a complex pressure resistance working environment.

[0038] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A linear ceramic waveguide filter, characterized in that: The invention comprises a port waveguide (1), a strip waveguide (2), a first type of rectangular waveguide (3) and a second type of rectangular waveguide (4); a receiving groove (1.1) is arranged on the port waveguide (1), and the strip waveguide (2), the first type of rectangular waveguide (3) and the second type of rectangular waveguide (4) are arranged in sequence in the receiving groove (1.1); a resonant cavity (5) and a flange (6) which are connected to the receiving groove (1.1) and are coaxial are arranged on the strip waveguide (2), the first type of rectangular waveguide (3) and the second type of rectangular waveguide (4); a tuning block (7) is arranged in each flange (6); and a dielectric material is filled in each resonant cavity (5); the dielectric material comprises ceramic.

2. The linear ceramic waveguide filter according to claim 1, characterized in that: The ceramics filled in each of the resonant cavities (5) form a Möbius ring structure (8).

3. The linear ceramic waveguide filter according to claim 2, characterized in that: It also includes a tuning screw (9) which can be screwed in and out at the center of each resonant cavity (5).

4. The linear ceramic waveguide filter according to claim 1, characterized in that: The tuning block (7) comprises stacked metal sheets.

5. The linear ceramic waveguide filter according to claim 4, characterized in that: A rolled steel wire is arranged between adjacent metal sheets in the tuning block (7).

6. The linear ceramic waveguide filter according to claim 1, characterized in that: The flange (6) arranged on the strip waveguide (2) is arranged close to the first type rectangular waveguide (3) and is accommodated in the resonant cavity (5) of the first type rectangular waveguide (3).

7. The linear ceramic waveguide filter according to claim 1, characterized in that: The flange (6) arranged on the first type rectangular waveguide (3) is arranged close to the second type rectangular waveguide (4) and is accommodated in the resonant cavity (5) of the second type rectangular waveguide (4).

8. The linear ceramic waveguide filter according to claim 1, characterized in that: Buffer pads are arranged on the inner wall and the outer wall of each flange (6).

9. A curved ceramic waveguide filter, characterized in that: The invention comprises a curved waveguide (10) and a linear ceramic waveguide filter as claimed in any one of claims 1 to 8; the linear ceramic waveguide filters are arranged on both sides of the curved waveguide (10); the curved waveguide (10) is arranged on a side of the second type rectangular waveguide (4) away from the first type rectangular waveguide (3); a resonant curved cavity is arranged on the curved waveguide (10); and air is filled in the resonant curved cavity.

10. The bent ceramic waveguide filter according to claim 9, characterized in that: The flange (6) arranged on the second type rectangular waveguide (4) is arranged close to the curved waveguide (10) and is accommodated in the resonant curved cavity of the curved waveguide (10).

Images