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Branching filter

A demultiplexer and filter technology, applied in impedance networks, electrical components, multi-terminal-pair networks, etc., can solve problems such as the deterioration of demultiplexer characteristics, and achieve the effect of good characteristics

Inactive Publication Date: 2017-08-08
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, currently, in a duplexer that uses a via column to form a path from a common port to at least one of the two filters, due to the inductance of the via column, a circuit breaker occurs between the common port and at least one of the two filters. There is a problem that the characteristics of the wave splitter are deteriorated compared with the design time due to the mismatch of impedance

Method used

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Embodiment Construction

[0034] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, refer to figure 1 , the circuit configuration of the demultiplexer according to one embodiment of the present invention will be described. The demultiplexer 1 of the present embodiment is a demultiplexer for separating a first signal having a frequency in a first frequency band and a second signal having a frequency in a second frequency band different from the first frequency band.

[0035] The duplexer 1 of the present embodiment includes a common port 2 , a first signal port 3 , a second signal port 4 , a first filter 10 , a second filter 20 , a connection path 30 , and a first capacitor C41 .

[0036] The first filter 10 is disposed between the common port 2 and the first signal port 3 to selectively pass signals of frequencies within the first passband. The first frequency band may also be consistent with the first passband, or may be a part of the...

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Abstract

The invention provides a branching filter. The branching filter includes a first filter provided between a common port and a first signal port, and a second filter provided between the common port and a second signal port. The branching filter further includes a connection path and a first capacitor. The connection path includes a first inductor, and connects the common port and the first filter. The first capacitor is provided between the connection path and the ground. The second filter is connected to the connection path. The first capacitor is connected to the first inductor at a first branch point located at any position in the first inductor.

Description

technical field [0001] The present invention relates to a wave splitter for separating a plurality of signals having different frequencies. Background technique [0002] In recent years, in small-sized mobile communication devices typified by mobile phones and smartphones, multi-functionalization and multi-system (multi-band) development are advancing. In addition, in this small mobile communication device, from the viewpoint of miniaturization, space saving, and cost reduction, antennas commonly used in multiple applications with different frequency bands and systems are widely used, and the antennas are separated by using a demultiplexer. The structure of multiple signals sent and received by an antenna. [0003] Generally, a demultiplexer for separating two signals with different frequency bands has a common port, a first signal port, a second signal port, a first filter disposed between the common port and the first signal port, and a first filter disposed between the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/46
CPCH03H7/461H03H7/0115H03H7/463H03H7/46
Inventor 北见学塚本和宽
Owner TDK CORPARATION