LTCC (Low Temperature Co-fired Ceramic)-based one-split-to-three bandpass filtering power divider

Abstract

The invention discloses an LTCC (Low Temperature Co-fired Ceramic)-based one-split-to-three bandpass filtering power divider. The LTCC (Low Temperature Co-fired Ceramic)-based one-split-to-three bandpass filtering power divider includes a bandpass filter and a one-split-to-three power divider; the bandpass filter comprises a first input port, a first input inductor, four stages of parallel resonant units, a first output inductor, and a z-shaped inter-stage coupling strip line, wherein the four stages of parallel resonant units are connected with one another sequentially; the one-split-to-threepower divider is composed of a compact three-dimensional integrated structure; and the first output inductor of the passband filter is connected with the input capacitor plate of the power divider, so that the one-split-to-three bandpass filtering power divider can be formed. According to the LTCC (Low Temperature Co-fired Ceramic)-based one-split-to-three bandpass filtering power divider of theinvention, three-dimensional integration is realized through the low temperature co-fired ceramic (LTCC) process technology, and therefore, the miniaturization of the power divider is realized. The power divider of the invention has the advantages of flatness in passband, the consistency of power and phases of the output signals of three output ports, high port matching performance, good isolationbetween ports and high stability, and can be widely applied to communication systems such as communication system radio frequency front ends and mobile terminal systems.

Description

technical field [0001] The invention relates to an LTCC-based one-to-three band-pass filter power splitter, which belongs to the field of microwave technology. Background technique [0002] With the continuous development of wireless radio frequency communication technology, microwave radio frequency circuits are more and more widely used. As a key part of microwave circuits, the performance requirements for filters and power splitters are also getting higher and higher. The power divider is a multi-port passive microwave network used to distribute or synthesize signals, mainly used in microwave power amplification and linearization circuits. From the mid-1950s to the 1960s, Wilkinson power dividers appeared. Because of their simple structure and the output ports meeting the requirements of both isolation and matching, they are more widely used. With the rapid development of modern communication technology, the traditional Wilkinson structure is far from meeting the require...

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Problems solved by technology

[0003] In 2010, P. Cheong proposed to use a resonant circuit with a band-pass response to replace the quarter-wavelength converter in the traditional Wilkinson power divider. This type of structure has a small size and high isolation, but the out-of-band suppression is poor.

In 2011, Garcia proposed a filter power splitter in which the filter and the power splitter are cascaded together in the article. Although the structure is relatively simple, the size is large

In the past ten years, scholars have gradually begun to pay attention to the research on filter power dividers. At present, there are still many problems in this technology, such as large size and insufficient bandwidth.

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