A frequency tunable LTCC filter

Abstract

The utility model relates to filter field, concretely is a kind of adjustable frequency's LTCC filter, including LTCC filter shell, the inside of LTCC filter shell is provided with several interlinked through -holes, the one end of several interlinked through -holes is penetrated and comes out LTCC filter shell, the other end of several interlinked through -holes is respectively provided with filter loading capacitor, the ground end of filter loading capacitor is penetrated interlinked through -hole, interlinked through -hole is used to draw the ground port of filter loading capacitor to come out LTCC filter shell outside, the ground port that comes out LTCC filter shell outside is provided with ground capacitor, LTCC filter shell inside is provided with filter resonator, to realize the frequency accurate control of LTCC filter, solve the frequency parameter deviation problem after LTCC filter production, improve the qualified rate of production, conducive to mass production.

Description

Technical Field

[0001] This invention relates to the field of filters, and in particular to tunable frequency LTCC filters. Background Technology

[0002] LTCC filters are radio frequency front-end filters based on low-temperature co-fired ceramic (LTCC) technology. They offer advantages such as high-frequency performance, small size, and low cost, and are widely used in 5G communications, satellites, and high-speed electronic systems. They are typically manufactured using thick-film printing processes. A key feature is their high degree of three-dimensional integration, making them suitable for miniaturized surface mount processes. With the continuous improvement of system integration and miniaturization, microwave filters manufactured using LTCC technology have rapidly gained popularity in the communications field.

[0003] With the development of communication technology, wireless frequency band coverage is becoming increasingly dense. To avoid mutual electromagnetic interference, the requirements for filter specifications in the communication field are becoming increasingly stringent. Since the internal circuitry of LTCC filters is typically implemented using thick-film printing technology, the precision control range of this process is between ±5µm and ±10µm. This precision is well-suited for manufacturing L and S band filters. However, when the required frequency reaches the C band or higher, due to the inherent precision of the thick-film process, the internal pattern dimensional accuracy of filters manufactured using conventional methods cannot meet the requirements. This leads to deviations in filter frequency parameters, significantly reducing the yield rate and hindering mass production.

[0004] The present invention aims to solve the technical problems existing in the prior art. To this end, an adjustable frequency LTCC filter is proposed. Utility Model Content

[0005] The purpose of this invention is to provide an adjustable frequency LTCC filter to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An adjustable frequency LTCC filter includes an LTCC filter housing. The LTCC filter housing has several interconnecting vias inside. One end of each interconnecting via extends out of the LTCC filter housing, and the other end of each interconnecting via is provided with a filter loading capacitor. The ground terminal of the filter loading capacitor passes through the interconnecting via. The interconnecting via is used to lead the ground port of the filter loading capacitor out of the LTCC filter housing. The ground port leading out of the LTCC filter housing is provided with a grounding capacitor. A filter resonator is disposed inside the LTCC filter housing.

[0007] As a further improvement of this utility model: one end of the LTCC filter housing is provided with an output port, and the other end of the LTCC filter housing is provided with an input port.

[0008] As a further improvement of this utility model: the filter resonator is provided with input / output coupling structures on both sides, and the two input / output coupling structures are respectively connected to the output port and the input port.

[0009] Compared with the prior art, the beneficial effects of this utility model are: the device facilitates fine-tuning of the frequency of the manufactured LTCC filter, thereby compensating for the frequency offset caused by processing errors and the difference in individual consistency between batches, realizing precise frequency control of the LTCC filter, solving the problem of frequency parameter deviation after LTCC filter production, improving the production qualification rate, and facilitating mass production. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of an adjustable frequency LTCC filter.

[0011] Figure 2 This is a schematic diagram of the internal structure of an adjustable frequency LTCC filter.

[0012] Figure 3 This is a schematic diagram of the input port structure of an adjustable frequency LTCC filter.

[0013] 1-LTCC filter housing, 2-interconnect via, 3-filter loading capacitor, 4-filter resonator, 5-input / output coupling structure, 6-output port, 7-input port. Detailed Implementation

[0014] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0015] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0016] Please see Figure 1In this embodiment of the present invention, an adjustable frequency LTCC filter includes an LTCC filter housing 1. The LTCC filter housing 1 has several interconnecting holes 2 inside. One end of each interconnecting hole 2 extends out of the LTCC filter housing 1, and the other end of each interconnecting hole 2 is provided with a filter loading capacitor 3. The grounding terminal of the filter loading capacitor 3 passes through the interconnecting hole 2. The interconnecting hole 2 is used to lead the grounding port of the filter loading capacitor 3 out of the LTCC filter housing 1. A grounding capacitor is provided at the grounding port outside the LTCC filter housing 1. A filter resonator 4 is provided inside the LTCC filter housing 1. By adjusting the grounding capacitor using laser adjustment, the conductor of the grounding capacitor can be adjusted to an open circuit state, thereby adjusting the size of the filter loading capacitor 3, and thus changing the frequency of the LTCC filter. This achieves fine-tuning of the LTCC filter frequency after manufacturing, thereby compensating for frequency offsets caused by processing errors and differences in individual consistency between batches, and realizing precise control of the LTCC filter frequency.

[0017] Please see Figure 1 and Figure 3 The LTCC filter housing 1 has an output port 6 at one end and an input port 7 at the other end.

[0018] Please see Figure 2 The filter resonator 4 has input / output coupling structures 5 on both sides, and the two input / output coupling structures 5 are connected to the output port 6 and the input port 7 respectively.

[0019] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0020] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An adjustable frequency LTCC filter, comprising an LTCC filter housing (1), characterized in that, The LTCC filter housing (1) has several interconnecting holes (2) inside. One end of each interconnecting hole (2) extends out of the LTCC filter housing (1), and the other end of each interconnecting hole (2) is provided with a filter loading capacitor (3). The grounding end of the filter loading capacitor (3) extends through the interconnecting hole (2). The interconnecting hole (2) is used to lead the grounding port of the filter loading capacitor (3) out of the LTCC filter housing (1). The grounding port led out of the LTCC filter housing (1) is provided with a grounding capacitor. The LTCC filter housing (1) has a filter resonator (4) inside.

2. The adjustable frequency LTCC filter according to claim 1, characterized in that, The LTCC filter housing (1) has an output port (6) at one end and an input port (7) at the other end.

3. The adjustable frequency LTCC filter according to claim 1, characterized in that, The filter resonator (4) is provided with input / output coupling structures (5) on both sides, and the two input / output coupling structures (5) are connected to the output port (6) and the input port (7) respectively.

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