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High-rejection LTCC (low temperature co-fired ceramic) low-pass filter

A low-pass filter, high-rejection technology, applied in the field of electronics, can solve problems such as increasing the difficulty of design and processing, high in-band insertion loss, etc.

Active Publication Date: 2014-07-23
SUZHOU BOHAI CHUANGYE MICRO SYST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the size of 1206 (3.2mm×1.6mm) has become a standard package size for microwave chip devices. Under such size conditions, it is generally possible to realize 5th-order to 7th-order low-pass filters, and achieve higher-order low-pass filters. The pass filter will increase the difficulty of design and processing and bring higher in-band insertion loss, which cannot meet the actual needs

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0026] Figure 1 shows a prototype circuit of a 5th-order Chebyshev low-pass filter. In order to improve the out-of-band rejection of the filter, three reactance components are added to the prototype circuit in this embodiment, including inductor L3, L4 and capacitor C4 form a transmission zero point, such as figure 2 shown. These three transmission zeros are generated by the parallel resonant cavity inductance L1, capacitor C4, series resonant cavity inductance L3, capacitor C1 and series resonant cavity inductance L4, capacitor C3 respectively, and the position of the transmission zero can be controlled by the value of the reactive element of the resonant cavity. Through the design of the tr...

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Abstract

The invention discloses a high-rejection LTCC (low temperature co-fired ceramic) low-pass filter which comprises an input terminal, an output terminal and a grounding terminal. Out-of-band rejection of the filter is improved by adding a transmission zero outside a band, and reactance elements are connected according to a certain topological structure by the aid of LTCC multilayer ceramic technology to achieve functions of the low-pass filter. A filter packaging structure is a standard 1206 packaging structure, and grounding layers inside the filter are connected through a weldable conductor printed by the side face of an LTCC substrate to form a grounding electrode of the filter. The low-pass filter has the advantages of small size, low cost, low insertion loss, high out-of-band rejection, fine temperature stability, convenience in use and the like, and batch production is facilitated.

Description

[0001] technical field [0002] The invention belongs to the field of electronic technology, and relates to a high-rejection low-pass filter, and in particular to a low-temperature co-fired ceramic (LTCC) low-pass filter considering the packaging structure. Background technique [0003] The low-pass filter is an important passive device in the radio frequency circuit. Its main function is to reduce the passage of other signals as much as possible while passing the signal in the passband with low loss. A good low-pass filter not only requires low in-band loss and high out-of-band rejection, but also requires as small a volume as possible. [0004] The traditional low-pass filter generally adopts the Chebyshev low-pass filter prototype circuit. The out-of-band rejection of this filter increases with the increase of the order, but the problem caused by the increase of the order is the number of components. increase and an increase in filter insertion loss. In addition, the mi...

Claims

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Application Information

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IPC IPC(8): H03H7/01
Inventor 黄勇汪杰张慧景展丙章
Owner SUZHOU BOHAI CHUANGYE MICRO SYST
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