Integrated dielectric filter

Abstract

The utility model discloses an integrated dielectric filter, which comprises a body and dielectric coaxial resonators arranged in the body, the number of the resonators is at least two, one end of each resonator is close to a first surface of the body, and the other end of each resonator is close to a second surface of the body. The first surface is provided with a groove along the axial direction of the resonator; the cross section of the groove covers the cross section of the resonator; a boss is arranged in the groove in the axial direction of the groove, and the height of the boss is smaller than the depth of the groove. According to the utility model, the stepped structure is arranged in the groove, so that the inductive coupling amount between adjacent resonant cavities can be increased, the high-frequency passband is wider, and the insertion loss is smaller after the bandwidth is wider. Meanwhile, the inductance values of the multiple resonant cavities are reduced, the capacitance values of the multiple resonant cavities are increased, high-frequency transmission zero approximation is achieved, and better out-of-band rejection is obtained.

Description

Technical Field

[0001] The utility model relates to the field of filters, in particular to a connected dielectric filter. Background Art

[0002] With the rapid development of wireless communication technology, the electronics industry has increasingly higher requirements for the miniaturization of electronic devices. Communication products are developing in the direction of small size, low insertion loss, and high out-of-band suppression. In the fields of handheld devices, radios, drones, etc., the requirements for miniaturized electronic components are becoming increasingly higher.

[0003] In conventional filter circuit design, single-sided coupling is used, which has limited coupling strength, making it difficult to widen the signal transmission bandwidth and close the transmission zero point, forcing the design to require larger and more resonant units. Utility Model Content

[0004] The present invention overcomes the shortcomings of the prior art, such as limited coupling strength, difficulty in widening the signal transmission bandwidth, and difficulty in compressing the transmission zero point, and provides a one-piece dielectric filter. To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a one-piece dielectric filter, characterized in that it comprises: a body and a dielectric coaxial resonator arranged in the body, the number of the resonators being at least two, one end of the resonator being close to the first surface of the body, and the other end being close to the second surface of the body, the first surface being provided with a groove along the axial direction of the resonator; the cross section of the groove covering the cross section of the resonator; a boss being provided in the groove along the axial direction of the groove, the height of the boss being less than the depth of the groove.

[0005] In a preferred embodiment of the present invention, a circuit board is provided on the second surface of the body.

[0006] In a preferred embodiment of the present invention, a silver layer is provided outside the main body.

[0007] In a preferred embodiment of the present invention, the number of the boss is one, and the boss is located in the middle of the groove.

[0008] In a preferred embodiment of the present invention, the boss is arranged between two adjacent resonators.

[0009] In a preferred embodiment of the present invention, the number of the bosses is at least two, and the bosses are evenly arranged along the resonator.

[0010] In a preferred embodiment of the present invention, the heights of the plurality of bosses are the same.

[0011] In a preferred embodiment of the present invention, a plurality of the resonators are evenly arranged along the body.

[0012] In a preferred embodiment of the present invention, the cross section of the boss does not contact the cross section of the resonator.

[0013] The present invention solves the defects in the background technology and has the following beneficial effects:

[0014] The stepped structure of the grooves in this invention increases the inductive coupling between adjacent resonant cavities, widening the high-frequency passband. With a wider bandwidth, insertion loss is reduced. Simultaneously, the inductance of the multiple resonant cavities themselves is reduced, while the capacitance of the multiple resonant cavities themselves is increased, bringing the high-frequency transmission zero point closer and achieving better out-of-band suppression. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, they can also obtain drawings of other embodiments based on these drawings.

[0016] Figure 1 Schematic diagram of a one-piece dielectric filter according to one embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the circuit position of a one-piece dielectric filter described in one embodiment of the present utility model;

[0018] Figure 3 This is a schematic internal diagram of a one-piece dielectric filter according to an embodiment of the present invention.

[0019] The reference numerals are as follows:

[0020] 1-body; 101-resonator; 2-boss; 3-circuit board; 4-first resonant cavity; 5-second resonant cavity; 6-third resonant cavity; 7-fourth resonant cavity. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purposes, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner. Therefore, they only show the structures related to the present invention. It should be noted that, unless there is a conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0024] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0025] A one-piece dielectric filter, such as Figure 1 As shown, it includes: a body 1 and a dielectric coaxial resonator 101 arranged in the body 1, the number of resonators 101 is at least two, one end of the resonator 101 is close to the first surface of the body 1, and the other end is close to the second surface of the body 1, and the first surface is provided with a groove along the axial direction of the resonator 101; the cross section of the groove covers the cross section of the resonator 101; a boss 2 is provided in the groove along the axial direction of the groove, and the height of the boss 2 is less than the depth of the groove.

[0026] That is to say, the groove is divided into at least three connected groove bodies by the boss 2, and the three connected groove bodies are arranged in a stepped manner.

[0027] like Figure 2As shown, the second surface of the body 1 is provided with a circuit board 3. Specifically, the first surface and the second surface are arranged opposite to each other. Except for the surface on which the circuit board 3 is arranged, the other five surfaces of the body 1 are all provided with a silver layer.

[0028] In the present invention, the slots can increase the resonant frequency, and then reduce the resonant frequency from the side where the circuit board is set, so that the overall length of the resonant cavity is shorter and a smaller volume is obtained.

[0029] There is one boss 2, which is located in the middle of the groove. The cross section of the boss 2 does not touch the cross section of the resonator 101. In other words, although the boss 2 is provided, it does not structurally affect the operation of the resonant cavity.

[0030] The resonators 101 are evenly arranged along the body 1 , and the boss 2 is disposed between two adjacent resonators 101 .

[0031] There are at least two bosses 2, and the bosses 2 are evenly arranged along the resonator 101. The bosses 2 have the same height, that is, the bosses 2 have the same size.

[0032] like Figure 3 As shown, in one embodiment of the present invention, there are four resonators, which respectively correspond to the first resonant cavity 4, the second resonant cavity 5, the third resonant cavity 6 and the fourth resonant cavity 7. The boss 2 is disposed between the second resonator and the third resonator.

[0033] That is to say, the stepped structure in the groove can increase the inductive coupling between the first resonant cavity 4 and the second resonant cavity 5, and increase the inductive coupling between the third resonant cavity 6 and the fourth resonant cavity 7, so that the high-frequency passband is wider. With a wider bandwidth, the insertion loss is smaller.

[0034] At the same time, the inductance of the first resonant cavity 4 and the second resonant cavity 5 is reduced, and the capacitance of the first resonant cavity 4 and the second resonant cavity 5 is increased, so that the high-frequency transmission zero point is approached, and better out-of-band suppression is obtained.

[0035] In summary, the utility model provides a dielectric filter with small size, low insertion loss, high out-of-band suppression and wide passband.

[0036] The above embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, and these variations and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A one-piece dielectric filter, characterized in that: include: A body and a dielectric coaxial resonator disposed within the body, wherein the number of the resonators is at least two, one end of the resonator is close to the first surface of the body, and the other end is close to the second surface of the body, the first surface is provided with a groove along the axial direction of the resonator; the cross section of the groove covers the cross section of the resonator; a boss is provided in the groove along the axial direction of the groove, and the height of the boss is less than the depth of the groove.

2. The one-piece dielectric filter according to claim 1, characterized in that: A circuit board is provided on the second surface of the body.

3. The one-piece dielectric filter according to claim 1, characterized in that: A silver layer is arranged outside the main body.

4. The one-piece dielectric filter according to claim 1, characterized in that: The number of the boss is one, and the boss is located in the middle of the groove.

5. The one-piece dielectric filter according to claim 1, characterized in that: The boss is arranged between two adjacent resonators.

6. The one-piece dielectric filter according to claim 1, characterized in that: The number of the bosses is at least two, and the bosses are evenly arranged along the resonator.

7. The one-piece dielectric filter according to claim 1, characterized in that: The heights of the plurality of bosses are the same.

8. The one-piece dielectric filter according to claim 1, characterized in that: A plurality of the resonators are evenly arranged along the body.

9. The one-piece dielectric filter according to claim 1, characterized in that: A cross section of the boss does not contact a cross section of the resonator.

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