Title:
DUPLEXER AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/088477
Kind Code:
A1
Abstract:
Provided are a duplexer and an electronic device. A suppression zero point can be generated at a low-frequency end of a transmission filter by means of a tuning unit circuit, and a zero point position in a wider frequency band range is changed by means of adjusting design parameters in the tuning unit circuit, such that the requirement for an out-of-band suppression index of a receiving filter is satisfied in a specific frequency band. The duplexer comprises: a transmission filter and a receiving filter, wherein the transmission filter and the receiving filter are connected to an antenna terminal, and a tuning unit circuit is connected between the receiving filter and the antenna terminal in series; and the tuning unit circuit comprises a series tuning circuit connected between the receiving filter and the antenna terminal and a parallel tuning circuit connected between a connection point, that is between the series tuning circuit and the receiving filter, and a grounding end, and an inductor is connected between the parallel tuning circuit and the grounding end.
Inventors:
PANG WEI (CN)
BIAN ZIPENG (CN)
BIAN ZIPENG (CN)
Application Number:
PCT/CN2020/111349
Publication Date:
May 14, 2021
Filing Date:
August 26, 2020
Export Citation:
Assignee:
UNIV TIANJIN (CN)
ROFS MICROSYSTEM TIANJIN CO LTD (CN)
ROFS MICROSYSTEM TIANJIN CO LTD (CN)
International Classes:
H03H9/70
Foreign References:
| CN110943711A | 2020-03-31 | |||
| CN1945987A | 2007-04-11 | |||
| CN109639255A | 2019-04-16 | |||
| CN1711681A | 2005-12-21 | |||
| US9899986B2 | 2018-02-20 |
Attorney, Agent or Firm:
CHINA SMART INTELLECTUAL PROPERTY LTD. (CN)
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