Miniaturized substrate integrated waveguide filter with controllable passband number

Abstract

The utility model belongs to the technical field of filters, and particularly relates to a miniaturized substrate integrated waveguide filter with controllable passband number, which comprises a filter assembly. Comprising a lower-layer metal plate, a dielectric substrate arranged at the top of the lower-layer metal plate, an upper-layer metal plate arranged at the top of the dielectric substrate, a snakelike microstrip resonator arranged in the middle of the surface of the upper-layer metal plate, and a first excitation port and a second excitation port which are arranged at the two ends of the upper-layer metal plate; wherein the snakelike microstrip resonator is composed of an upper part and a lower part, when the upper part and the lower part have the same length, a single-passband filter is formed, and when the upper part and the lower part have different lengths, a dual-passband filter is formed; the structure is reasonable, the snakelike microstrip resonator is embedded in the upper metal surface of the substrate integrated waveguide, and the filter with a smaller size is realized by adopting an innovative method; meanwhile, on the premise that the size of the whole SIW is not changed, single-passband and double-passband conversion is achieved only by adjusting the length of the snakelike microstrip resonator.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to a miniaturized substrate integrated waveguide filter with controllable passband quantity. Background Art

[0002] With the rapid development of wireless communication technology, the performance requirements for RF devices are becoming increasingly higher. As one of the key components of RF devices, bandpass filters need to have a more compact structure, superior filtering performance, and easier integration. Substrate-integrated waveguide structures combine the advantages of planar microstrip lines and metal rectangular waveguides. They have the advantages of low cost, low radiation loss, low insertion loss, high quality factor, and compact structure, making them widely used in filter design. To further improve filtering performance, scholars have proposed a variety of design methods that combine substrate-integrated waveguide structures with other structures.

[0003] Currently, most single-bandpass filters are designed by introducing complementary resonant rings, perturbation metal vias, and coupling slots, while dual-bandpass filters tend to be implemented using defective ground structures, dual-mode technology, and multilayer structures. Some existing technologies have employed substrate-integrated waveguide technology and coplanar waveguide technology to design wide-stopband bandpass filters. This design suppresses high-order modes by placing metal vias at the center of the resonant cavity, achieving wide stopband performance. However, electromagnetic leakage results in high insertion loss. Other designs achieve wide stopband performance by adjusting the coupling strength of the TE101 and TE102 modes within the cavity, but the filter's lower stopband performance is poor. Other designs implement bandpass filters with adjustable center frequency and bandwidth by incorporating perturbation metal vias and slot structures into a circular substrate-integrated waveguide resonant cavity. However, these designs lack transmission zeros and exhibit subpar filtering performance. Therefore, designing a high-frequency bandpass filter with a compact structure, low loss, and excellent out-of-band suppression is of great significance and practical value. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract and title of the utility model to avoid obscuring the purpose of this section, the abstract and the title of the utility model, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the problems existing in the existing technology, the present utility model is proposed.

[0006] Therefore, the purpose of the present invention is to provide a miniaturized substrate-integrated waveguide filter with a controllable number of passbands. A serpentine microstrip resonator is embedded in the upper metal surface of the substrate-integrated waveguide, and an innovative method is used to realize a smaller filter. At the same time, without changing the size of the entire SIW, single-passband and dual-passband conversion can be achieved by simply adjusting the length of the serpentine microstrip resonator.

[0007] In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0008] A miniaturized substrate-integrated waveguide filter with controllable passband number, comprising:

[0009] The filter assembly includes a lower metal plate, a dielectric substrate disposed on top of the lower metal plate, an upper metal plate disposed on top of the dielectric substrate, a serpentine microstrip resonator disposed in the middle of the surface of the upper metal plate, and a first excitation port and a second excitation port disposed at both ends of the upper metal plate;

[0010] The serpentine microstrip resonator consists of two parts, an upper part and an lower part. When the upper and lower parts are of the same length, a single-passband filter is formed. When the upper and lower parts are of different lengths, a dual-passband filter is formed.

[0011] As a preferred solution of the miniaturized substrate-integrated waveguide filter with controllable passband number described in the utility model, metal through holes are provided on both sides of the lower metal plate, the dielectric substrate and the upper metal plate.

[0012] As a preferred solution of the miniaturized substrate-integrated waveguide filter with controllable passband number described in the utility model, the material of the dielectric substrate is ZYF300CA-P, with a relative dielectric constant of 3, a loss tangent of 0.0018, and a thickness of 0.762 mm.

[0013] As a preferred solution of the miniaturized substrate-integrated waveguide filter with controllable passband number described in the present invention, the first excitation port and the second excitation port adopt a trapezoidal structure.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] A serpentine microstrip resonator is embedded in the upper metal surface of the substrate integrated waveguide, and an innovative method is used to realize a smaller filter. At the same time, without changing the size of the entire SIW, single-passband and dual-passband conversion can be achieved by only adjusting the length of the serpentine microstrip resonator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive labor. Among them:

[0017] Figure 1 This is a schematic structural diagram of the utility model.

[0018] In the figure, 100 is a filter component, 110 is a lower metal plate, 120 is a dielectric substrate, 130 is an upper metal plate, 140 is a serpentine microstrip resonator, 150 is a first excitation port, 160 is a second excitation port, and 170 is a metal through hole. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing the embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0023] The utility model provides the following technical solutions: a miniaturized substrate-integrated waveguide filter with controllable passband number, in which a serpentine microstrip resonator is embedded in the upper metal surface of the substrate-integrated waveguide, using an innovative method to achieve a smaller filter size; at the same time, without changing the overall SIW size, single-passband and dual-passband conversion can be achieved by simply adjusting the length of the serpentine microstrip resonator;

[0024] Figure 1 FIG2 shows a schematic structural diagram of an embodiment of a miniaturized substrate-integrated waveguide filter with controllable passband number according to the present invention, wherein the main body thereof includes a filter assembly 100;

[0025] The filter assembly 100 includes a lower metal plate 110, a dielectric substrate 120 mounted on top of the lower metal plate 110, an upper metal plate 130 mounted on top of the dielectric substrate 120, a serpentine microstrip resonator 140 mounted in the middle of the surface of the upper metal plate 130, and a first excitation port 150 and a second excitation port 160 mounted at both ends of the upper metal plate 130.

[0026] The serpentine microstrip resonator 140 consists of two parts, an upper part and an lower part. When the upper and lower parts are of the same length, a single-passband filter is formed. When the upper and lower parts are of different lengths, a dual-passband filter is formed.

[0027] Metal through holes 170 are provided on both sides of the lower metal plate 110 , the dielectric substrate 120 and the upper metal plate 130 ;

[0028] The dielectric substrate 120 is made of ZYF300CA-P, with a relative dielectric constant of 3, a loss tangent of 0.0018, and a thickness of 0.762 mm.

[0029] The first excitation port 150 and the second excitation port 160 have a trapezoidal structure.

[0030] Combine Figure 1 This embodiment provides a miniaturized substrate-integrated waveguide filter with controllable passband numbers. The specific principles are as follows: a serpentine microstrip resonator 140 is embedded in the upper metal surface of the substrate-integrated waveguide, using an innovative method to achieve a smaller filter size. Furthermore, without changing the overall SIW size, single-passband and dual-passband conversion is achieved simply by adjusting the length of the serpentine microstrip resonator 140. The serpentine microstrip resonator 140 consists of an upper and lower portion. When the upper and lower portions are the same length, a single-passband filter is formed; when the upper and lower portions are of different lengths, a dual-passband filter is formed.

[0031] While the present invention has been described above with reference to specific embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, as long as no structural conflicts exist, the various features of the embodiments disclosed herein may be combined with one another in any manner, and the omission of an exhaustive description of these combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A miniaturized substrate-integrated waveguide filter with controllable passband number, characterized in that: include: A filter assembly (100) comprises a lower metal plate (110), a dielectric substrate (120) arranged on top of the lower metal plate (110), an upper metal plate (130) arranged on top of the dielectric substrate (120), a serpentine microstrip resonator (140) arranged in the middle of the surface of the upper metal plate (130), and a first excitation port (150) and a second excitation port (160) arranged at both ends of the upper metal plate (130); The serpentine microstrip resonator (140) is composed of an upper and lower part. When the upper and lower parts are of the same length, a single-passband filter is formed. When the upper and lower parts are of different lengths, a dual-passband filter is formed.

2. The miniaturized substrate-integrated waveguide filter with controllable passband number according to claim 1, characterized in that: Metal through holes (170) are provided on both sides of the lower metal plate (110), the dielectric substrate (120) and the upper metal plate (130).

3. The miniaturized substrate-integrated waveguide filter with controllable passband number according to claim 1, characterized in that: The dielectric substrate (120) is made of ZYF300CA-P, has a relative dielectric constant of 3, a loss tangent of 0.0018, and a thickness of 0.762 mm.

4. The miniaturized substrate-integrated waveguide filter with controllable passband number according to claim 1, characterized in that: The first excitation port (150) and the second excitation port (160) adopt a trapezoidal structure.

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