A ltcc balanced bandpass filter based on multi-frequency coupling

A band-pass filter, balanced technology, applied in waveguide-type devices, resonators, circuits, etc., can solve the problems that affect the original performance of lumped elements, and the parameters of lumped elements cannot be accurately controlled, and achieve out-of-band suppression. Good, compact structure, high common mode rejection ratio effect

Active Publication Date: 2019-12-10
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

But as the frequency increases, parasitic effects and unwanted coupling may affect the original performance of the lumped element, so the parameters of the lumped element cannot be accurately controlled, and the distributed resonator will not have the same question

Method used

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  • A ltcc balanced bandpass filter based on multi-frequency coupling
  • A ltcc balanced bandpass filter based on multi-frequency coupling
  • A ltcc balanced bandpass filter based on multi-frequency coupling

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Embodiment Construction

[0029] The technical solutions adopted in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The drawings in the following description are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to these drawings without creative work.

[0030] Such as figure 1 As shown, the embodiment of the present invention provides a LTCC balanced filter based on multi-coupling common-mode signal suppression. The entire filter is an LTCC multilayer structure consisting of seven dielectric substrates, eight conductor layers and six metal Composed of through holes; two half-wavelength open-line resonators are respectively connected by microstrip lines located in three different conductor layers through metal through holes, and are distributed in a front-to-back and left-right symmetrical structure; each layer of dielectric substrate is composed of the bottom A...

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Abstract

The invention discloses an LTCC balanced band-pass filter based on multi-frequency coupling, comprising two half-wavelength resonators and two groups of feeders. The two half-wavelength resonators are each composed of micro-strip lines in three different conductor layers, and the micro-strip lines in different conductor layers are connected by metal through holes. First coupling regions (211) of the two half-wavelength resonators are coupled to each other in the form of parallel coupling. The two groups of feeders (501, 502, 503) are disposed in the same conductor layer, and feed second coupling regions (411) of the two half-wavelength resonators under the feeders in the form of vertical coupling. The size of the filter is reduced effectively. The filter has high common-mode rejection ratio. Source-load coupling is introduced between the feeders, three transmission zeros are produced, and the selectivity of pass band is improved.

Description

technical field [0001] The invention relates to a balanced band-pass filter, in particular to a balanced band-pass filter based on LTCC technology which can be applied to radio frequency front-end circuits by using a feed structure to suppress common-mode signals. Background technique [0002] With the rapid development of modern wireless communication systems, there is an increasing demand for balanced circuits, and balanced filters are one of the important passive components, which usually occupy a large area for traditional printed circuits. Therefore, the miniaturization of the filter is very important. [0003] Existing planar balanced filters have been studied a lot and have good performance, but their size is very large, which makes it difficult for practical applications. Therefore, low-temperature co-fired ceramic (LTCC) technology can significantly reduce the size of the circuit and has the advantages of low cost, good high-frequency performance, and low insertion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203H01P7/08
CPCH01P1/203H01P7/08
Inventor 李园春陈钦创
Owner SOUTH CHINA UNIV OF TECH
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