Title:
DUPLEXER AND PACKAGING METHOD THEREFOR, AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/273198
Kind Code:
A1
Abstract:
Embodiments of the present application provide a duplexer and a packaging method therefor, and an electronic device. The duplexer comprises a substrate and a piezoelectric chip, a transmit filter and a receive filter are disposed on a first surface of the piezoelectric chip, the transmit filter is connected in series between a transmit end and an antenna end, the receive filter is connected in series between a receive end and the antenna end, and the first surface of the piezoelectric chip covers a first surface of the substrate; the transmit filter comprises a first parallel branch and a first inductor, the first parallel branch is connected in series to the first inductor, and the first inductor is grounded; the first parallel branch is a first parallel branch close to the transmit end in the transmit filter, and a winding direction of the first inductor on the first surface is a counterclockwise direction. In the duplexer provided in the embodiments of the present application, a winding direction of an inductor connected to the ground in series with the first parallel branch close to the transmit end is a counterclockwise direction, such that deterioration of the degree of isolation of the duplexer can be avoided, and the degree of isolation of the duplexer in a receive frequency band is effectively guaranteed.
Inventors:
CHEN JING (CN)
Application Number:
PCT/CN2021/138102
Publication Date:
January 05, 2023
Filing Date:
December 14, 2021
Export Citation:
Assignee:
SPREADTRUM COMM SHANGHAI CO (CN)
International Classes:
H03H9/10; H03H9/72
Foreign References:
| CN113422590A | 2021-09-21 | |||
| US20140111286A1 | 2014-04-24 | |||
| CN111697945A | 2020-09-22 | |||
| CN110943711A | 2020-03-31 | |||
| CN109802644A | 2019-05-24 |
Attorney, Agent or Firm:
LEADER PATENT & TRADEMARK FIRM (CN)
Download PDF: