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Duplexer

A duplexer and filter technology, which is applied in the field of duplexers, can solve problems such as increased insertion loss, and achieve the effect of suppressing large-scale

Pending Publication Date: 2022-03-11
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] If an LC low-pass filter and an LC high-pass filter are used as the matching circuit of the duplexer, there is a problem of increased insertion loss
[0008] In addition, in the case where capacitor electrodes and inductor electrodes are provided on a multilayer substrate formed by laminating a plurality of base material layers to form a duplexer, if an LC low-pass filter and an LC high-pass filter are provided as matching circuits, it is necessary to There is a problem of increasing the size of the duplexer due to the formation of a large number of components on a multilayer substrate

Method used

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Embodiment Construction

[0019] Hereinafter, the form for implementing this invention is demonstrated based on drawing. In addition, each embodiment has shown the embodiment of this invention by way of example, and this invention is not limited to the content of embodiment. In addition, the contents described in different embodiments can also be implemented in combination, and the implementation contents in this case are also included in the present invention. In addition, the drawings are used to help the understanding of the specification, and sometimes they are schematically drawn, and the depicted components or the ratio of dimensions between the components may not match the components or the ratio of dimensions between the components described in the specification. Case. In addition, in the drawings, components described in the specification may be omitted, or the number of components described in the specification may be omitted and drawn.

[0020] figure 1 , figure 2 A duplexer 100 accordi...

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Abstract

The invention provides a duplexer which is small in insertion loss and suppresses enlargement. The duplexer is provided with a low-band bandpass filter (LBF) provided between the common input / output terminal (CT) and the low-band input / output terminal (LT), and a high-band bandpass filter (HBF) provided between the common input / output terminal (CT) and the high-band input / output terminal (HT). The low-band bandpass filter (LBF) is configured from a device having a plurality of LC resonators (LC11-LC13) of first to last stages in this order from a common input / output terminal (CT) toward a low-band input / output terminal (LT). The high-frequency band bandpass filter (HBF) is configured from a device having a plurality of LC resonators (LC21-LC24) of first to last stages in this order from the common input / output terminal (CT) toward the high-frequency band input / output terminal (HT), and a matching capacitor (MC) is provided between the common input / output terminal (CT) and the low-frequency band bandpass filter (LBF). The capacitance of the capacitor (C11) of the first-stage LC resonator (LC11) of the low-band band-pass filter (LBF) is smaller than the capacitance of the capacitor (C13) of the last-stage LC resonator (LC13).

Description

technical field [0001] The present invention relates to a duplexer, and more specifically, to a duplexer including a low-band band-pass filter and a high-band band-pass filter. Background technique [0002] Patent Document 1 and Patent Document 2 disclose a bandpass filter. These bandpass filters are constructed by capacitively coupling and magnetically coupling a plurality of LC resonators. Each LC resonator is composed of a conductive conductor or an inductor composed of a conductive conductor and a wiring conductor, and a capacitor composed of an end electrode provided at one end of the conductive conductor of the inductor and a ground electrode. [0003] A duplexer can be configured by combining a plurality of such bandpass filters. For example, by providing a common input-output terminal, a low-band input-output terminal, and a high-band input-output terminal, a low-band bandpass filter is provided between the common input-output terminal and the low-band input-output...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/075H03H7/38H03H7/46
CPCH03H7/075H03H7/38H03H7/46H03H7/463H03H7/1775H03H7/0115H03H7/09H03H2001/0085H03H7/1766
Inventor 山崎裕太郎元山洋人谷口哲夫上西雄二
Owner MURATA MFG CO LTD