CN218633887U - Multiplexer and communication equipment comprising same - Google Patents
Multiplexer and communication equipment comprising same Download PDFInfo
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- CN218633887U CN218633887U CN202222599582.2U CN202222599582U CN218633887U CN 218633887 U CN218633887 U CN 218633887U CN 202222599582 U CN202222599582 U CN 202222599582U CN 218633887 U CN218633887 U CN 218633887U
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Abstract
The utility model relates to a multiplexer and communication equipment comprising the same, the multiplexer comprises a transmitting filter, the transmitting filter is provided with an input end, an output end, M series branches, P parallel branches and a coupling branch, wherein M and P are natural numbers, and the parallel branches comprise at least one resonator and at least one inductor; m +1 connecting nodes are arranged among the input end, the M serial branches and the output end; the J-th parallel branch comprises at least two inductors connected in series, and one end of the coupling branch is connected with the I-th connection node N I The other end of the coupling branch is connected with the two stringsAnd the coupling point of the inductor is connected, wherein I is more than or equal to 1 and less than or equal to M, and J is more than I and less than or equal to M +1.
Description
Technical Field
The present invention relates to a communication device, and more particularly, to a communication device including a multiplexer.
Background
Portable communication devices, such as mobile phones, notebooks, personal Digital Assistants (PDAs), global Positioning Systems (GPS), and beidou, communicate via various communication networks. The portable communication device generally includes an rf front end module, where a multiplexer is a main component of the rf front end module, and as the 5G business increases, the demand for the multiplexer is also increasing.
Fig. 1 shows a circuit configuration diagram of a conventional duplexer, and particularly, a circuit configuration diagram of a transmitting filter in the conventional duplexer. As shown in fig. 1, the duplexer includes a transmission filter Tx and a reception filter Rx, the transmission filter Tx being connected between a common port 1 and a transmission port 2, the common port 1 being an external port for transmitting and receiving electric waves through an antenna. The transmitting filter Tx comprises resonators s1-s4 arranged in series between a common port 1 and a transmitting port 2, the resonator s1 is arranged between a node N1 and a node N2, the resonator s2 is arranged between the node N2 and the node N3, the resonator s3 is arranged between the node N3 and the node N4, the resonator s4 is arranged between the node N4 and a node N5, parallel branches are arranged between the nodes N2-N5 and the ground potential respectively, a resonator, such as the resonators p1-p4 shown in fig. 1, is arranged on each parallel branch, the resonator p1 is connected with the ground potential through an inductor L1, the resonator p2 is connected with the ground potential through an inductor L2, and the resonator p3 and the resonator p4 are connected with the ground potential through a common inductor L3; one end of the inductor L4 is connected with the node N5, and the other end of the inductor L4 is connected with the ground potential. The receive filter Rx is connected between the common port 1 and the receive port 3.
Fig. 2 is a graph of a prior art duplexer frequency response and fig. 3 is a graph of a prior art duplexer isolation. In the prior art, the improvement of the isolation on the right side of the passband of the duplexer is mainly realized by increasing the inductance value of the inductor L3 on the parallel branch of the transmitting filter Tx and further pulling the far transmission zero on the right side of the passband closer. However, increasing the inductance value of the inductor L3 deteriorates the suppression effect of the transmission filter Tx on the second harmonic and the third harmonic, and also increases the insertion loss of the transmission filter Tx.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to above-mentioned technical problem, the circuit to transmitting filter in the multiplexer has carried out design carefully, designs one kind and can effectively improve the multiplexer of multiplexer isolation, can avoid worsening the suppression effect of transmitting filter Tx to second harmonic and third harmonic to and avoid increasing the insertion loss of transmitting filter Tx.
A brief summary of the present invention will be given below in order to provide a basic understanding of some aspects of the present invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.
According to the utility model discloses an aspect provides a multiplexer includes: the transmitting filter is provided with an input end, an output end, M series branches, P parallel branches and a coupling branch, wherein M and P are natural numbers, and the parallel branches comprise at least one resonator and at least one inductor; m +1 connecting nodes are arranged among the input end, the M serial branches and the output end; the J-th parallel branch comprises at least two inductors connected in series, and one end of the coupling branch is connected to the I-th connection node N I And the other end of the coupling branch is connected to the coupling point of the two inductors connected in series, wherein I is more than or equal to 1 and less than or equal to M, and J is more than or equal to I and less than or equal to M +1.
Furthermore, the value of I is 1, and the value of J is M +1.
Further, the coupling branch comprises a capacitance unit, and the capacitance value of the capacitance unit is 0.001pf-10pf.
Furthermore, the inductance value of the inductor connected with the ground potential in the two inductors of the J-th parallel branch is 0.001nH-10nH.
Furthermore, the multiplexer further includes a matching circuit, and the matching circuit is disposed at the input end and/or the output end.
Further, the plurality of series circuits have a series resonance unit selected from one of a single resonator unit, a series connection of the resonator unit and an inductance element, and a parallel connection of the resonator unit and a capacitance element.
Further, the other parallel branches except the jth parallel branch are connected to the variable module.
Further, the variable module is a ground potential, a common inductor, or a combination thereof.
Furthermore, the passband frequency range of the transmission filter is 1710MHz to 1788MHz.
According to another aspect of the present invention, there is provided a communication device including the multiplexer of any one of the above.
According to a further aspect of the present invention, there is provided a communication device, comprising the multiplexer according to any one of the above embodiments.
The utility model discloses a scheme can help improving multiplexer isolation.
Drawings
The above and other objects, features and advantages of the present invention will be more readily understood from the following description of the specific contents of the present invention with reference to the accompanying drawings. The drawings are only for the purpose of illustrating the principles of the invention. The dimensions and relative positioning of the elements in the figures are not necessarily drawn to scale.
Fig. 1 shows a schematic circuit configuration diagram of a duplexer in the prior art;
figure 2 shows a prior art diplexer frequency response graph;
figure 3 shows a prior art duplexer isolation curve;
fig. 4 shows a block diagram of the circuit structure of the duplexer of the present invention;
fig. 5-8 show specific circuit structure diagrams of the transmitting filter in the duplexer according to the present invention;
figure 9 shows a frequency response plot for a comparative duplexer;
figure 10 shows a frequency response graph of a duplexer of the present invention;
fig. 11 is a comparison graph of the frequency response measurement results of the duplexer of the comparative example and the duplexer of the present invention;
FIG. 12 is a graph comparing isolation measurements of a duplexer of a comparative example and a duplexer of the present invention;
Detailed Description
Exemplary disclosures of the present invention will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an implementation of the present invention have been described in the specification. It will be appreciated, however, that in the development of any such actual embodiment, numerous implementation-specific decisions may be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Here, it should be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure closely related to the solution according to the present invention is shown in the drawings, and other details not closely related to the present invention are omitted.
It is to be understood that the invention is not limited to the described embodiments, since the description proceeds with reference to the drawings. Herein, features between different embodiments may be replaced or borrowed where feasible, and one or more features may be omitted in one embodiment.
Fig. 4 shows a block diagram of the basic circuit structure of the transmitting filter in the duplexer according to the present invention. As shown in fig. 4, the duplexer of the present invention includes a transmitting filter Tx and a receiving filter Rx, the present invention does not specifically limit the topology and the order of the receiving filter Rx in the duplexer, and the receiving filter is disposed between the common terminal a and the receiving terminal C. The common port a is an external port that transmits and receives an electric wave through an antenna.
The utility model discloses a duplexer in transmit filter Tx set up between common terminal A (input) and transmit terminal B (output), transmit filter Tx includes M series connection branch SL 1 -SL M P parallel branches PL 1 -PL P Coupled branchCP and at least one matching branch MC. M and P are natural numbers, the numerical value of M is equal to the number of the serial branches, the numerical value of P is equal to the number of the serial branches, and M and P can be the same numerical value.
In particular, M series branches SL 1 -SL M Arranged in sequence between a common terminal A and an emission terminal B, the common terminal A being connected to a series branch SL 1 Between adjacent series branches and mth series branch SL M And the transmitting terminal B, namely M +1 connecting nodes N 1 -N M+1 。
In particular, the I-th parallel branch PL I Is connected to the connection node N I+1， The other end of the variable module MU is connected to the variable module MU, the variable module MU is selected from ground potential, common inductance or a combination of the above options, and I is more than or equal to 1 and less than or equal to P. When the I-th parallel branch PL I When the variable module MU connected to the other end of the first branch line PL includes a common inductor I At least one of the parallel branches is connected with one end of the common inductor after being connected with the other parallel branch in parallel.
Further, in the series branch SL 1 -SL M Are respectively provided with a series resonance unit SZ 1 -SZ M In the parallel branch PL 1 -PL M Are respectively provided with parallel resonance units PZ 1 -PZ P 。
Further, for the series resonant unit SZ 1 -SZ M And parallel resonance unit PZ 1 -PZ P It may be one form selected from among a separate resonator unit, a series connection of a resonator unit and an inductance element, and a parallel connection of a resonator unit and a capacitance element.
Further, the resonator unit includes at least one resonator or a plurality of resonators, and when the resonator unit includes a plurality of resonators, the plurality of resonators are connected in series and/or in parallel.
Further, when the series resonant unit SZ 1 -SZ M And parallel resonance unit PZ 1 -PZ M Selected from the series connection of the resonator unit with at least one inductive element, or the resonator unit with a capacitive elementThe inductance value of the inductance element or the capacitance value of the capacitance element may be equal or different between different resonance units.
The utility model discloses a transmitting filter in transmitting filter structure in duplexer is provided with the matching branch circuit MC, and the matching branch circuit MC can set up between common port A and the ground potential and/or between transmitting port B and the ground potential. The matching branch MC is used for impedance matching to avoid signal loss due to signal reflection. The matching branch MC may be various series-parallel combinations of capacitances and/or inductances.
The utility model discloses a transmitting filter in duplexer still is provided with coupling branch CP, and coupling branch CP includes electric capacity unit Cm.
The capacitance unit Cm in the coupling branch CP is at least composed of one capacitor or a plurality of capacitors, and when the capacitance unit Cm is composed of a plurality of capacitors, the plurality of capacitors can be connected in series and/or in parallel, and the capacitance value of the capacitance unit Cm is set to be between 0.001pf and 10pf. One end of the capacitance unit Cm in the coupling branch CP is connected to the connection node N I Wherein I is more than or equal to 1 and less than or equal to M. Meanwhile, the other end of the capacitor unit Cm in the coupling branch CP passes through the coupling point N CL Connected to parallel branch PL J Wherein J is more than I and less than or equal to M +1. Coupling point N CL And the ground potential, an inductance unit Lm is arranged between the inductor unit Lm and the ground potential, the inductance unit Lm is at least composed of one inductor or a plurality of inductors, when the inductance unit Lm is composed of a plurality of inductors, the plurality of inductors can be connected in series and/or in parallel, and the inductance value of the inductance unit Lm is set to be 0.001-10nH. The utility model discloses a to the meticulous design of above-mentioned coupling branch CP connected mode to promote the isolation of duplexer.
It can understand, in the utility model discloses in the coupling branch CP the connected node that electric capacity unit's one end is connected to is nimble changeable, and the connected mode of the other end of electric capacity unit is also equally diversified, regardless of aforementioned connected mode.
Referring to fig. 5, fig. 5 schematically shows a specific circuit configuration diagram of the transmit filter Tx in fig. 4.
Specifically, the multiplexer includes a transmission filterTx, a transmission filter is connected between a common port a, which is an external port that transmits and receives an electric wave through an antenna, and a transmission port B. The transmit filter Tx comprises 4 series branches SL connected in series between a common port a and a transmit port B 1 -SL 4 Between the common port a, the 4 series branches and the transmission port B there are connection nodes N1-N5, wherein a series resonant unit SZ is arranged between the connection node N1 and the connection node N2 1 A series resonance unit SZ composed of a resonator s11 and arranged between a connection node N2 and a connection node N3 2 A series resonance unit SZ composed of a resonator s22 and arranged between a connection node N3 and a connection node N4 3 A series resonance unit SZ composed of a resonator s33 and arranged between a connection node N4 and a connection node N5 4 Is constituted by the resonator s 44.
The connection node N2 is connected with a parallel branch PL 1 Parallel branch PL 1 A resonator p11 is arranged on the upper part; the connection node N3 is connected with a parallel branch PL 2 Parallel branch PL 2 A resonator p22 is arranged on the upper part; the connection node N4 is connected with a parallel branch PL 3 Parallel branch PL 3 A resonator p33 is arranged on the upper part; the connection node N5 is connected with a parallel branch PL 4 Parallel branch PL 3 On which a resonator p44 is arranged.
Further, one end of the resonator p11 is connected to the connection node N2, the other end of the resonator p11 is connected to the inductor L1, and the resonator p11 and the inductor L1 form a parallel branch PL 1 Upper parallel resonance unit PZ 1 (ii) a One end of the resonator p22 is connected to the connection node N3, the other end of the resonator p22 is connected to the inductor L2, and the resonator p22 and the inductor L2 form a parallel branch PL 2 Upper parallel resonant unit PZ 2 (ii) a Parallel resonant unit PZ 1 And parallel resonance unit PZ 2 The interconnect is then connected to ground potential. The resonator p33 constitutes a parallel resonance unit PZ 3 The resonator p44 constitutes a parallel resonance unit PZ 4 Parallel resonant cell PZ 3 And parallel resonance unit PZ 4 After being connected in parallel, the common inductor L3 is connected with a coupling point N CL Connecting node N CL By an electricityThe inductor L4 is connected to ground potential. Specifically, the inductance values of the inductor L1, the inductor L2, and the inductor L3 may be set to 0.01 to 10nH.
One end of the inductor L5 is connected to the node N5, and the other end of the inductor L5 is connected to the ground potential, thereby forming a matching branch MC.
The coupling branch is formed by connecting the capacitor C1 and the inductor L4 in series. A coupling point N is arranged between the capacitor C1 and the inductor L4 CL . One end of the capacitor C1 is connected to the connection node N1, and the other end of the capacitor C1 is connected to the coupling node N CL The capacitance value of the capacitor C1 is about 0.05pf; one end of the inductor L4 is connected to the coupling point N CL The other end of the inductor L4 is connected to ground potential, and the inductance of the inductor L4 is about 0.15nH.
It will be further understood by those skilled in the art that the specific circuit structure of the duplexer transmit filter in fig. 5 is merely exemplary and should not be considered as a limitation to the specific circuit structure of the transmit filter in the duplexer of the present invention, and the specific circuit structure of the duplexer transmit filter can be modified in various ways without departing from the limitations described in the foregoing block diagram.
Alternatively, referring to fig. 4-6 in combination, for the parallel branch PL of the transmit filter of fig. 5 3 Parallel resonance unit PZ composed of upper resonator p33 3 And parallel branch PL 4 Parallel resonance unit PZ composed of upper resonator p44 4 In the case of a solution in which the parallel branches are connected to ground together via a common inductor L3, this can be replaced by the solution shown in fig. 6, i.e. the parallel branch PL 3 Parallel resonance unit PZ composed of upper resonator p33 3 Connected to earth potential solely by an inductor L6, parallel branch PL 4 Parallel resonance unit PZ composed of upper resonator p44 4 Connected to the inductor L4 solely through the inductor L3.
Alternatively, referring to fig. 4,5 and 7 in combination, the parallel branch PL of the transmitting filter in fig. 5 can be used 1 Parallel resonance unit PZ composed of upper resonator p11 and inductor L1 1 Instead, it is constituted only by the resonator p11; will shunt branch PL 2 Parallel resonance unit PZ composed of upper resonator p22 and inductor L2 2 Instead of being constructed only of resonators p22Forming; the resonator p11 is connected in parallel with the resonator p22 and then connected to the ground potential via a common inductor L7.
Alternatively, referring to fig. 4,5 and 8 in combination, the parallel branch PL of the transmitting filter in fig. 5 can be used 2 Parallel resonance unit PZ composed of upper resonator p22 and inductor L2 2 Instead, it is constituted only by the resonator p22; parallel branch PL to be constituted only by resonator p22 2 Parallel resonant unit PZ of 2 With parallel resonant cells PZ 3 Parallel resonant unit PZ 4 After being connected in parallel, the inductor L4 is connected to the inductor L3 through a shared inductor.
It should be further understood by those skilled in the art that, although the transmission filter in the present embodiment adopts a 4-series 4-parallel structure, the circuit structure of the transmission filter may be a transmission filter having any order and topology, and for example, may be 5-series 4-parallel, series 3-parallel, 3-series 2-parallel, 3-series 4-parallel, or 4-series 4-parallel, etc. including any number of series resonant cells and parallel resonant cells. All such variations, combinations and permutations are within the scope of the present disclosure.
For comparison, the duplexer of the present invention and the duplexer of the comparative example have frequency response characteristics and isolation performance. It is right the utility model discloses a duplexer carries out corresponding capability test with the duplexer of comparative example, and the duplexer of comparative example is the duplexer of not adopting above-mentioned improvement measure. This is explained in detail below with reference to fig. 9 to 12.
Fig. 9 is an isolation curve diagram of a duplexer of a comparative example, fig. 10 is an isolation curve diagram of a duplexer of the present invention, fig. 11 is a comparison diagram of frequency response measurement results of a duplexer of the present invention and a duplexer of the present invention, wherein R11 is a frequency response test result of a duplexer of the present invention, and R21 is a frequency response test result of a duplexer of the comparative example; fig. 12 is a comparison graph of isolation measurement results of a duplexer of a comparative example and a duplexer of the present invention, wherein R12 is an isolation test result of the duplexer of the present invention, R22 is an isolation test result of the duplexer of the comparative example, dB (S (1, 4)) is an insertion loss of a transmitting filter, dB (S (1, 5)) is an insertion loss of a receiving filter, and dB (S (4, 5)) is an isolation of the duplexer.
As is clear from fig. 9-12, the isolation of the receiving filter in the duplexer of the present invention between the passband frequencies 1.802GHz-1.880GHz is above 60 dB. And compare the worst isolation of receiving filter in the duplexer of comparative example in frequency 1.880GHz department, the utility model discloses a duplexer successfully makes the isolation of receiving filter in this frequency department promote to 68.027dB. The utility model can improve the worst isolation and simultaneously meet the requirement of the receiving terminal on the threshold value of the isolation when the receiving terminal prevents the radio frequency power output by the transmitting terminal from the antenna from interfering the normal work of the receiving filter; furthermore, the utility model discloses a duplexer does not worsen other duplexer performances.
The utility model provides a multiplexer is the module that can handle fourth generation communication standard (4G), fifth generation communication standard (5G) or can handle the device of carrier aggregation and double connection. This multiplexer includes aforementioned emission filter, the utility model discloses can effectively improve the multiplexer of multiplexer isolation, avoid worsening the emission filter to the suppression effect of secondary harmonic and third harmonic to and avoid increasing emission filter's insertion loss. Illustratively, the multiplexer may be, for example, a quadruplex multiplexer having four filters, including a B1 receiving filter having a passband frequency range of 2110MHz to 2170MHz, a B1 transmitting filter having a passband frequency range of 1920MHz to 1980MHz, a B3 receiving filter having a passband frequency range of 1802MHz to 1880MHz, and a B3 transmitting filter having a passband frequency range of 1710MHz to 1788MHz. Wherein the B3 transmit filter may be a transmit filter having the aforementioned circuit structure.
It should be understood by those skilled in the art that the multiplexer of the present invention can refer to various types of multiplexers such as duplexers, triplexers, quadroplexers, etc.
Further, the multiplexer may be used in a communication device, exemplified by a mobile phone, a personal digital assistant, an electronic game device, a wearable terminal, and the like.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that these descriptions are made only by way of example and not as limitations to the scope of the invention. Various modifications and adaptations of the present invention may occur to those skilled in the art, which are within the spirit and scope of the present invention.
Claims (10)
1. A multiplexer, comprising:
the transmitting filter is provided with an input end, an output end, M series branches, P parallel branches and a coupling branch, wherein M and P are natural numbers, and each parallel branch comprises at least one resonator and at least one inductor;
m +1 connecting nodes are arranged among the input end, the M serial branches and the output end;
the J-th parallel branch comprises at least two inductors connected in series, and one end of the coupling branch is connected to the I-th connection node N I The other end of the coupling branch is connected to the coupling point of the two inductors connected in series, wherein I is more than or equal to 1 and less than or equal to M, and J is more than or equal to I and less than or equal to M +1.
2. The multiplexer of claim 1, wherein: the value of I is 1, and the value of J is M +1.
3. The multiplexer of claim 1 or 2, wherein: the coupling branch comprises a capacitor unit, and the capacitance value of the capacitor unit is 0.001pf-10pf.
4. A multiplexer as claimed in claim 3, wherein: and the inductance value of an inductor connected with the ground potential in the two inductors of the J-th parallel branch is 0.001nH-10nH.
5. The multiplexer of claim 1, wherein: the multiplexer also comprises a matching circuit, and the matching circuit is arranged at the input end and/or the output end.
6. The multiplexer of claim 1, wherein: the M series circuits have a series resonant cell selected from one of a separate resonator cell, a series connection of a resonator cell and an inductive element, and a parallel connection of a resonator cell and a capacitive element.
7. The multiplexer of claim 6, wherein: the other parallel branches except the J-th parallel branch are connected to the variable module.
8. The multiplexer of claim 7, wherein: the variable module is ground potential, a common inductor, or a combination thereof.
9. The multiplexer of claim 8, wherein: the passband frequency range of the emission filter is 1710 MHz-1788 MHz.
10. A communication device, characterized by: the communication device comprising a multiplexer according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222599582.2U CN218633887U (en) | 2022-09-30 | 2022-09-30 | Multiplexer and communication equipment comprising same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222599582.2U CN218633887U (en) | 2022-09-30 | 2022-09-30 | Multiplexer and communication equipment comprising same |
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| CN218633887U true CN218633887U (en) | 2023-03-14 |
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| CN202222599582.2U Active CN218633887U (en) | 2022-09-30 | 2022-09-30 | Multiplexer and communication equipment comprising same |
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