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A dual-mode circular high order cavity filter of substrate integration waveguide

A substrate-integrated waveguide and circular cavity technology, applied in the high-frequency field, can solve the problems of inability to design and process, the influence of metallized through holes of the SIW main mode filter is too large, and achieve flat band-pass characteristics and reduced tolerances. , the effect of increasing the cavity size

Inactive Publication Date: 2008-07-09
SOUTHEAST UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Technical problem: the purpose of this invention is to propose a substrate integrated waveguide high-order dual-mode circular cavity filter, which is used to solve the problem of the performance of the SIW main mode filter in the high-frequency field due to the too small cavity. The influence of the through hole is too large, which leads to the contradiction that it cannot be designed and processed. On the other hand, it provides a design idea of ​​a millimeter-wave filter with simple design and large operating bandwidth.

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  • A dual-mode circular high order cavity filter of substrate integration waveguide
  • A dual-mode circular high order cavity filter of substrate integration waveguide
  • A dual-mode circular high order cavity filter of substrate integration waveguide

Examples

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Embodiment 1

[0020] Embodiment 1 Ka-band two-cavity dual-mode filter

[0021] The filter structure is shown in Figure 3. 31 is an inductive metal coupling window, 32 is two symmetrical circular dual-mode cavities, and 33 is an input and output microstrip line for testing. The radius of the circular cavity of a single substrate integrated waveguide is 5.45mm, and the whole filter is composed of two identical cavity folds, the layout is relatively compact, and the whole filter is centrally symmetrical. The substrate adopts Rogers5880 with a dielectric constant of 2.2 and a thickness of 0.5mm. A substrate with a higher dielectric constant can reduce the cavity size. The measured transmission characteristics of the filter are shown by the solid line in Figure 4. The measured loss is about 1.7dB. This loss includes the loss caused by the test connector, microstrip feeder and gradient line. After deducting these effects, the actual loss of the filter will be smaller. The filter is designed in...

Embodiment 2

[0022] Embodiment 2 Q-band two-cavity dual-mode filter

[0023] In order to better verify the characteristics of the circular high-order dual-mode filter, Example 2 designs a two-cavity filter with the same principle in the Q-band, which is composed of two identical circular cavity folds, and the entire filter The device is centrally symmetrical. The radius of the circular cavity is 4mm, and the substrate is Rogers5880 with a thickness of 0.254mm and a dielectric constant of 2.2. The measured transmission characteristics of the filter are shown in the solid line in Figure 6. The measured loss is about 2.39dB, including the loss of the test connector, microstrip feeder and gradient line. The filter is designed in the Q band, the 3dB passband bandwidth is approximately from 39.3GHz to 44.3GHz, and the relative bandwidth is 12%. The test results are very consistent with the simulation results, the four poles in the band and the zeros outside the band are very obvious, and the l...

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Abstract

A substrate integrated waveguide high-order dual-mode circular cavity filter relates to a millimeter-wave filter which is realized by using a substrate integrated waveguide high-order mode circular cavity; the invention can be applied in the communication system and other fields, in particular on the application occasions of high-frequency, low loss and high integration degree. The dual-mode circular cavity filter adopts a substrate integrated waveguide technology, the upper surface and the lower surface of a medium substrate (1) are coated with an upper surface metal copper (7) and a lower surface metal copper (8), a metalizing through hole array (2) penetrates the medium substrate (1), the upper surface metal copper (7) and the lower surface metal copper (8); a circular cavity (3) structure is formed by the surrounding of the metalizing through hole array, a first inductive coupling hole (61) and a second inductive coupling hole (62) are arranged on the circumference of the circular cavity, the central lines of the two inductive coupling holes are mutually vertical, the first inductive coupling hole is externally provided with a first metalizing through hole (4), and the second inductive coupling hole is externally provided with a second metalizing through hole (5).

Description

technical field [0001] The invention relates to a millimeter wave filter, which is realized by using a substrate integrated waveguide (Substrate Integrated Waveguide SIW) high-order mode circular cavity, which can be applied to communication systems and other fields, and is especially suitable for high frequency, low loss and Highly integrated applications. Background technique [0002] The filter is one of the important basic unit circuits of the circuit system, and its performance has an important impact on the overall selectivity, noise figure, gain, and sensitivity of the system. Commonly used in microwave and millimeter wave circuits are filters based on metal waveguides and filters based on planar circuits such as microstrip lines and coplanar lines. Filters based on metal waveguides usually have the advantages of high Q value, low loss, and good selectivity, but they require high processing precision, high cost, large volume, and are difficult to integrate with activ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/207H01P1/20H01P5/08
Inventor 董元旦洪伟
Owner SOUTHEAST UNIV