CN210958380U - Multiplexer and communication device - Google Patents
Multiplexer and communication device Download PDFInfo
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- CN210958380U CN210958380U CN201922488500.5U CN201922488500U CN210958380U CN 210958380 U CN210958380 U CN 210958380U CN 201922488500 U CN201922488500 U CN 201922488500U CN 210958380 U CN210958380 U CN 210958380U
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Abstract
The utility model relates to a multiplexer and communication device. The multiplexer includes a first filter, a second filter, a common terminal, and a common ground terminal, the first filter and the second filter being connected to the common terminal, the first filter including longitudinally coupled resonators and a capacitance, a ground side of the capacitance being connected to the common ground terminal, the second filter including a ladder circuit including at least one first series resonator and at least one parallel resonator, a ground side of at least one of the at least one parallel resonator being connected to the common ground terminal. The utility model discloses a multiplexer can effectively improve communication quality.
Description
Technical Field
The utility model relates to an use elastic wave technical field, especially relate to a multiplexer and have communication device of this multiplexer.
Background
In recent years, with the development of mobile communication systems, mobile phones and mobile information terminals have rapidly spread, and manufacturers are still competing for smaller terminals with higher performance. Multiplexers (e.g., duplexers) are receiving increased attention and research as one of the components of mobile communication devices.
Fig. 1 shows a conventional duplexer. The duplexer comprises a first filter 10 and a second filter 20. The first filter 10 and the second filter 20 are connected to the common terminal 30, the first filter 10 includes a longitudinal coupling resonator 101 and a capacitor 102, and the second filter 20 includes a ladder circuit including three series resonators and three parallel resonators. Wherein the capacitor 102 and the longitudinal coupling resonator 101 are connected in parallel to improve signal attenuation, and the longitudinal coupling resonator 101 and the capacitor 102 are connected to the same ground terminal 103 to facilitate miniaturization of the duplexer. However, in the configuration of the common ground terminal, the isolation of the duplexer is reduced, and the communication quality of the duplexer is deteriorated.
SUMMERY OF THE UTILITY MODEL
Based on the above-mentioned defects in the prior art, an object of the present invention is to provide a multiplexer capable of improving communication quality and a communication device having the same.
Therefore, the utility model provides the following technical scheme.
The utility model provides a multiplexer, which comprises a first filter, a second filter, a common terminal and a common grounding terminal,
the first filter and the second filter are connected to the common terminal,
the first filter includes a longitudinally coupled resonator and a capacitor, a ground side of the capacitor is connected to the common ground terminal,
the second filter comprises a ladder circuit comprising at least one first series resonator and at least one parallel resonator,
a ground side of at least one of the at least one parallel resonator is connected to the common ground terminal.
In at least one embodiment, the parallel resonator connected to the common ground terminal is closer to the common terminal than other parallel resonators not connected to the common ground terminal.
In at least one embodiment, there are a plurality of the parallel resonators connected to the common ground terminal.
In at least one embodiment, the wiring on the common ground terminal side of the plurality of parallel resonators is a common wiring, and the common wiring is connected to the common ground terminal.
In at least one embodiment, other parallel resonances not connected to the common ground terminal are connected to a common terminal different from the common ground terminal.
In at least one embodiment, there are two of the parallel resonators connected to the common ground terminal.
In at least one embodiment, the multiplexer further comprises a first ground terminal, the longitudinally coupled resonators being connected with the first ground terminal.
In at least one embodiment, the multiplexer includes a receive terminal and a transmit terminal, the receive terminal being connected to the first filter and the transmit terminal being connected to the second filter.
In at least one embodiment, the number of the parallel resonators is plural, and the number of the first series resonators is plural.
In at least one embodiment, the first filter is a receive filter and the second filter is a transmit filter.
The utility model also provides a communication device, communication device includes any one of the above-mentioned embodiment the multiplexer.
Through adopting foretell technical scheme, the utility model provides a multiplexer all is connected to sharing ground terminal through the ground connection side that makes at least one shunt resonator in the ground connection side of the electric capacity in the first wave filter and the second wave filter, can effectively improve multiplexer's communication quality.
It will be appreciated that a communication device having such a multiplexer has the same advantageous effects.
Drawings
Fig. 1 is a schematic diagram showing a configuration of a conventional duplexer.
Fig. 2 shows a schematic structural diagram of a first embodiment of a multiplexer according to the present invention.
Fig. 3 shows a frequency-attenuation characteristic diagram of the multiplexer in fig. 3.
Fig. 4 shows a schematic structural diagram of a second embodiment of a multiplexer according to the present invention.
Description of the reference numerals
10 a first filter; 101 longitudinally coupled resonators; 102 a capacitor; 103 a ground terminal; 20 a second filter; 30 a common terminal;
1 a first filter; 11 longitudinally coupling the resonators; 111 a first wiring; 112 a first ground terminal; 12 capacitors; 121 a second wiring; 122 a third wiring; 13 a second series resonator; 131 a fourth wiring;
2 a second filter; 21 a first series resonator; 211 a fifth wiring; 22 a parallel resonator; 221 a sixth wiring; 222 a second ground terminal; 223 a third ground terminal; 224 a seventh wiring;
3 a common terminal; 4 common ground terminal; 5 a receiving terminal; 6 a transmission terminal; x, Y curve.
Detailed Description
Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the invention, and is not intended to exhaust all possible ways of practicing the invention, nor is it intended to limit the scope of protection of the invention.
(first embodiment)
A first embodiment of the multiplexer according to the invention is explained in detail below with reference to fig. 2 and 3.
In the present embodiment, as shown in fig. 2, the multiplexer includes a first filter 1, a second filter 2, a common terminal 3, a common ground terminal 4, a reception terminal 5, and a transmission terminal 6. Wherein the first filter 1 and the second filter 2 are both connected to a common terminal 3. The reception terminal 5 is connected to the first filter 1, and the transmission terminal 6 is connected to the second filter 2. In the present embodiment, the first filter 1 is a reception filter, and the second filter 2 is a transmission filter. The multiplexer outputs the transmission signal transmitted from the transmission terminal 6 to the common terminal 3 by filtering, and outputs the reception signal from the common terminal 3 to the reception terminal 5 by filtering.
The first filter 1 comprises a longitudinal coupling resonator 11, a capacitor 12 and a second series resonator 13. One side of the longitudinally coupled resonator 11 is connected to the reception terminal 5 via a wire, the other side is connected in series to the second series resonator 13 via a first wire 111, one side of the capacitor 12 is connected to the first wire 111 via a second wire 121, the other side is connected to the common ground terminal 4 via a third wire 122, and the opposite side of the second series resonator 13 from the first wire 111 is connected to the common terminal 3 via a fourth wire 131. Wherein the longitudinally coupled resonator 11 is also connected to the first ground terminal 112.
The second filter 2 comprises a ladder circuit comprising three first series resonators 21 and three parallel resonators 22. The three first series resonators 21 are connected in series by wires, the first series resonator 21 on the right end (from the perspective of fig. 2) is connected to the transmission terminal 6, and the first series resonator 21 on the left end (from the perspective of fig. 2) is connected to the common terminal 3 by a fifth wire 211.
Of the three parallel resonators 22, one side of the parallel resonator 22 located at the rightmost end (from the perspective of fig. 2) is connected to the transmission terminal 6 by a wire, and the other end is connected to the common ground terminal 4 by a sixth wire 221. One end of the parallel resonator 22 located at the leftmost end (based on the perspective of fig. 2) is connected to the wiring between the two first series resonators 21 (i.e., the first series resonator 21 at the left end and the first series resonator 21 in the middle), and the other end is connected to the second ground terminal 222. One end of the parallel resonator 22 located in the middle is connected to a wire between the two first series resonators 21 (i.e., the first series resonator 21 on the right end and the first series resonator 21 in the middle), and the other end is connected to the third ground terminal 223.
In this embodiment, the multiplexer may be, for example, a duplexer.
In the present embodiment, as shown in fig. 3, a curve X in fig. 3 represents a frequency-attenuation characteristic curve when the capacitor and the longitudinally coupled resonator in the first filter share the ground terminal in the related art, and a curve Y represents a frequency-attenuation characteristic curve of the multiplexer in the present embodiment.
As can be seen from fig. 3, the attenuation characteristic of the multiplexer of the present embodiment is significantly improved in a specific frequency band (for example, approximately in the range of 940MHz to 960 MHz), that is, the communication quality is improved.
(second embodiment)
A second embodiment of the multiplexer according to the invention is explained in detail below with reference to fig. 4.
In the present embodiment, as shown in fig. 4, the multiplexer also includes a first filter 1, a second filter 2, a common terminal 3, a common ground terminal 4, a reception terminal 5, and a transmission terminal 6. Wherein the first filter 1 and the second filter 2 are both connected to a common terminal 3. The reception terminal 5 is connected to the first filter 1, and the transmission terminal 6 is connected to the second filter 2.
In this embodiment, the structure of the first filter 1 is basically the same as that of the first filter in the first embodiment, and is not described here again.
In the present embodiment, the structure of the second filter 2 is different from that of the first embodiment. The concrete description is as follows.
In the present embodiment, as shown in fig. 4, the second filter 2 includes a ladder circuit including four first series resonators 21 and four parallel resonators 22.
As in the first embodiment, the four first series resonators 21 are connected in series by wiring, the right first series resonator 21 is connected to the transmission terminal 6 by wiring, and the left first series resonator 21 is connected to the common terminal 3 by wiring.
Unlike the first embodiment, of the four parallel resonators 22, the two parallel resonators 22 on the right side are connected to different ground terminals, respectively, and the two parallel resonators 22 on the left side are each connected to the common ground terminal 4 through the seventh wire 224. Further, of the four parallel resonators 22, two parallel resonators 22 on the common terminal side are connected to the common ground terminal 4 via the same common seventh wiring 224 (common wiring). Of course, the present embodiment is not limited to this, and the two parallel resonators 22 on the right side may be connected to one common terminal different from the common ground terminal 4. That is, other parallel resonators 22 not connected to the common ground terminal 4 may be connected to a common terminal different from the common ground terminal 4.
In the present embodiment, by adopting the above-described technical means, the communication quality of the multiplexer can be improved.
Through adopting above-mentioned technical scheme, according to the utility model discloses a multiplexer has following advantage at least:
the utility model discloses an among the multiplexer, through the ground side that makes the electric capacity in the first filter and the ground side of at least one parallel resonator in the second filter all be connected to sharing ground terminal, can effectively improve multiplexer's communication quality.
The above embodiments of the present invention have been described in detail, but it should be added that:
(1) although it is described in the above embodiment that the number of the first series resonators and the number of the parallel resonators are three or four, respectively, the present invention is not limited thereto, and the number of the first series resonators and the number of the parallel resonators may be set as needed in actual circumstances, and may be one, two, five or more, respectively.
(2) Although it is described in the second embodiment that both of the two parallel resonators on the left side are connected to the common ground terminal, the present invention is not limited thereto, and any one of the two parallel resonators on the left side may be connected to the common ground terminal. It should be understood that when there are a plurality of parallel resonators, at least one of the parallel resonators may be connected to the common ground terminal, and may be a parallel resonator close to the common terminal or a parallel resonator far from the common terminal.
Furthermore, the utility model also provides a communication device, this communication device includes foretell multiplexer. The communication device may be, for example, a mobile phone.
Claims (11)
1. Multiplexer, characterized in that the multiplexer comprises a first filter (1), a second filter (2), a common terminal (3) and a common ground terminal (4),
the first filter (1) and the second filter (2) are connected to the common terminal (3),
the first filter (1) comprises a longitudinal coupling resonator (11) and a capacitance (12), the ground side of the capacitance (12) being connected to the common ground terminal (4),
the second filter (2) comprises a ladder circuit comprising at least one first series resonator (21) and at least one parallel resonator (22),
the ground side of at least one parallel resonator (22) of the at least one parallel resonator (22) is connected to the common ground terminal (4).
2. Multiplexer according to claim 1, characterized in that the parallel resonator (22) connected to the common ground terminal (4) is closer to the common terminal (3) than the other parallel resonators (22) not connected to the common ground terminal (4).
3. Multiplexer according to claim 1, characterized in that there are a plurality of parallel resonators (22) connected to the common ground terminal (4).
4. The multiplexer according to claim 3, wherein the wiring on the common ground terminal (4) side of the plurality of parallel resonators (22) is a common wiring, and the common wiring is connected to the common ground terminal (4).
5. Multiplexer according to claim 3, characterized in that the other parallel resonators (22) not connected to the common ground terminal (4) are connected to a common terminal different from the common ground terminal (4).
6. Multiplexer according to claim 3 or 4, characterized in that there are two parallel resonators (22) connected to the common ground terminal (4).
7. Multiplexer according to claim 1, characterized in that it further comprises a first ground terminal (112), the longitudinally coupled resonator (11) being connected with the first ground terminal (112).
8. Multiplexer according to claim 1, characterized in that the multiplexer comprises a receive terminal (5) and a transmit terminal (6),
the receiving terminal (5) is connected to the first filter (1),
the transmission terminal (6) is connected to the second filter (2).
9. Multiplexer according to claim 1, characterized in that the number of parallel resonators (22) is plural and the number of first series resonators (21) is plural.
10. Multiplexer according to claim 1, characterized in that the first filter (1) is a receive filter and the second filter (2) is a transmit filter.
11. A communication device, characterized in that it comprises a multiplexer according to any one of claims 1 to 10.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922488500.5U CN210958380U (en) | 2019-12-31 | 2019-12-31 | Multiplexer and communication device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922488500.5U CN210958380U (en) | 2019-12-31 | 2019-12-31 | Multiplexer and communication device |
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| CN210958380U true CN210958380U (en) | 2020-07-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532201A (en) * | 2021-02-07 | 2021-03-19 | 成都频岢微电子有限公司 | Layout structure for improving out-of-band rejection of surface acoustic wave receiving filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532201A (en) * | 2021-02-07 | 2021-03-19 | 成都频岢微电子有限公司 | Layout structure for improving out-of-band rejection of surface acoustic wave receiving filter |
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