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High selectivity broadband multi-order bandpass filter based on ltcc technology

A band-pass filter, high selectivity technology, applied in the direction of waveguide devices, circuits, electrical components, etc., can solve the problems of complex circuits, poor low-frequency DC blocking performance, large structure volume, etc., and achieve the goal of reducing the size of the circuit Effect

Inactive Publication Date: 2017-04-19
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the structure designed in the past are: (1) the low-frequency DC blocking performance is not good; (2) the structure is large and the circuit is complicated

Method used

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  • High selectivity broadband multi-order bandpass filter based on ltcc technology
  • High selectivity broadband multi-order bandpass filter based on ltcc technology
  • High selectivity broadband multi-order bandpass filter based on ltcc technology

Examples

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Effect test

Embodiment

[0028] According to the above high-selectivity broadband multi-order bandpass filter circuit model, from the port P 1 to port P 2 There are two different transmission paths (the open / short coupled line and the odd / even mode characteristic impedance between the open coupled line is Z oo and Z oe ), two pairs of open-circuit / short-circuit coupling lines form transmission path 1; two pairs of open-circuit coupling lines and two loaded short-circuit lines form transmission path 2. Since the overall model is a centrosymmetric circuit structure, it is very convenient to use odd / short-circuit Dual-mode theory for analysis. As for the transmission path 1, since the middle has a short-circuit characteristic, the short-circuit characteristic in the middle does not change when the odd / even mode is excited. For the transmission path 2, when the even mode is excited from two ports, the middle of the transmission path 2 is an open-circuit characteristic; when the odd mode is excited from t...

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Abstract

The invention discloses a novel high-selectivity broadband multi-order band-pass filter. Multilayer three-dimensional winding and interlayer coupling are realized by adopting an LTCC process, and two pairs of open circuit / short circuit coupling lines, two pairs of open circuit coupling lines, two short circuit lines, a metal plate and a plurality of metal through holes are formed. The magnitude of the coupling amount can be effectively controlled by adjusting the parameters of the coupling line intervals, line widths and the like, so that the bandwidth is flexibly controlled. Two different transmission paths are arranged between a circuit input port and an output port; the two pairs of open circuit / short circuit coupling lines form a transmission path; the two pairs of open circuit coupling lines and the two loaded short circuit lines form a transmission line 2; three-dimensional winding distribution is adopted, so that the circuit size is effectively reduced. The metal plate is positioned in the center, so that residual coupling among different parts is effectively isolated. By adopting the filter, high band-pass characteristic and a plurality of out-of-band zero points are realized under the coactions of the two transmission paths. The filter is simple in structural design, is small in size, has high electrical performance, and is easy for realizing circuit integration and system encapsulation.

Description

technical field [0001] The invention relates to the technical field of microwave filters, in particular to a high-selectivity broadband multi-order bandpass filter based on LTCC technology. Background technique [0002] With the rapid development of communication technology, people have higher and higher requirements for information transmission systems. As an important component in modern communication systems, microwave filters are closely related to the development of communication technology. Research on new filters And applications are becoming more and more important under the urgent needs of miniaturization, planarization, modularization and reliability development of modern radio frequency / microwave circuit systems, so it is of great significance and value to design miniaturized broadband filters with high selectivity . In order to improve the frequency selectivity of the filter, cascading band-stop filters is one of the commonly used methods. The disadvantage is th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/212
Inventor 高欣冯文杰车文荃洪美玲赵超颖
Owner NANJING UNIV OF SCI & TECH
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