WO2021088477A1 - Duplexer and electronic device - Google Patents

Duplexer and electronic device Download PDF

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Publication number
WO2021088477A1
WO2021088477A1 PCT/CN2020/111349 CN2020111349W WO2021088477A1 WO 2021088477 A1 WO2021088477 A1 WO 2021088477A1 CN 2020111349 W CN2020111349 W CN 2020111349W WO 2021088477 A1 WO2021088477 A1 WO 2021088477A1
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WIPO (PCT)
Prior art keywords
series
filter
parallel
resonator
tuning
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PCT/CN2020/111349
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French (fr)
Chinese (zh)
Inventor
庞慰
边子鹏
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天津大学
诺思(天津)微系统有限责任公司
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Application filed by 天津大学, 诺思(天津)微系统有限责任公司 filed Critical 天津大学
Publication of WO2021088477A1 publication Critical patent/WO2021088477A1/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
    • H03H9/703—Networks using bulk acoustic wave devices
    • H03H9/706—Duplexers

Definitions

  • the present invention relates to the technical field of image feature calculation, in particular to a duplexer and electronic equipment.
  • Radio frequency filters and duplexers are mainly used in wireless communication systems, such as radio frequency front-ends of base stations, mobile phones, computers, satellite communications, radars, electronic countermeasures systems, and so on.
  • the main performance indicators of radio frequency filters and duplexers are insertion loss, out-of-band suppression, power capacity, linearity, isolation, device size and cost.
  • Good filter and duplexer performance can improve the data transmission rate, life and reliability of the communication system to a certain extent. Therefore, the design of high-performance filters and duplexers for wireless communication systems is very important.
  • the present invention provides a duplexer and electronic equipment.
  • a suppression zero point can be generated at the low frequency end of a transmission filter through a tuning unit circuit, and the zero point position can be changed in a wider frequency band by adjusting the design parameters of the tuning unit circuit , So as to meet the requirements of the out-of-band suppression index of the transmit filter in a specific frequency band.
  • a duplexer comprising: a transmitting filter and a receiving filter, the transmitting filter and the receiving filter are connected to an antenna terminal, and a tuning unit circuit is connected in series between the receiving filter and the antenna terminal;
  • the tuning unit circuit includes a series tuning circuit connected between a receiving filter and an antenna terminal, and a parallel tuning circuit connected between a connection point between the series tuning circuit and the receiving filter and a ground terminal, the parallel resonant circuit An inductance is connected to the ground terminal.
  • the series tuning circuit includes an impedance converter and an inductor connected in series;
  • the series tuning circuit includes an impedance converter.
  • the impedance converter is a transmission line or an LC phase shifter.
  • the parallel tuning circuit includes a resonator and a capacitor connected in parallel;
  • the parallel tuning circuit includes a resonator and a capacitor connected in series;
  • the parallel tuning circuit includes a resonator.
  • the resonator is a bulk acoustic wave piezoelectric resonator, a solid assembly acoustic wave piezoelectric resonator, or an LWR resonator.
  • a duplexer comprising: a transmitting filter and a receiving filter, the transmitting filter and the receiving filter are connected to an antenna terminal, and a tuning unit circuit is connected in series between the receiving filter and the antenna terminal;
  • the tuning unit circuit includes a series tuning circuit and a parallel tuning circuit.
  • the series tuning circuit includes at least two impedance converters connected in series between the receiving filter and the antenna terminal; the parallel tuning circuit is connected to two series impedances. Between the connection point of the converter and the ground terminal, an inductance is connected between the parallel resonant circuit and the ground terminal.
  • the impedance converter is a transmission line or an LC phase shifter.
  • the parallel tuning circuit includes a parallel resonator and a capacitor
  • the parallel tuning circuit includes a resonator and a capacitor connected in series;
  • the parallel tuning circuit includes a resonator
  • the resonator is a bulk acoustic wave piezoelectric resonator, a solid assembly acoustic wave piezoelectric resonator, or an LWR resonator.
  • An electronic device includes the duplexer in the present invention.
  • the present invention introduces a tuning unit circuit, and the tuning unit circuit structure has the advantages of more tuning parameters and a larger tuning range;
  • the tuning unit circuit introduced in the present invention has a resonator, and the resonator can be loaded with or without a mass load, so that the flexibility of parameter adjustment is higher.
  • Figure 1 is a schematic structural diagram of a duplexer in the prior art
  • FIG. 2 is a schematic diagram of the structure of the duplexer of the first embodiment
  • 3 is a schematic diagram of the structure of the duplexer of the second embodiment
  • FIG. 5 is a schematic diagram of the structure of the duplexer of the fourth embodiment.
  • Figure 6(a) is the electrical symbol of the piezoelectric acoustic resonator
  • Figure 6(b) is the equivalent electrical model diagram of the piezoelectric acoustic wave resonator
  • Fig. 7 is an impedance frequency characteristic curve diagram of the resonator shown in Fig. 6;
  • Fig. 8 is the input characteristic impedance of the antenna end of the transmitting filter in the range of 1 GHz to 2 GHz without the function of the tuning unit circuit of the duplexer in Fig. 2;
  • Fig. 9 is the input characteristic impedance of the antenna end of the transmitting filter in the range of 1 GHz to 2 GHz under the action of the tuning unit circuit of the duplexer in Fig. 2;
  • Fig. 10 is an exemplary graph, in which the solid line corresponds to the frequency characteristic curve of the input and output transmission of the transmitting filter in the duplexer in Fig. 2 and the dashed line corresponds to the frequency characteristic of the input and output transmission of the transmitting filter in the duplexer in Fig. 1 Characteristic curve
  • 11 is the frequency characteristic curve of the input and output transmission of the transmitting filter in the duplexer corresponding to the electrical lengths of the different transmission lines of the tuning unit circuit of the duplexer in FIG. 2;
  • 13 is the frequency characteristic curve of the input and output transmission of the transmitting filter in the duplexer corresponding to the area of different resonators of the tuning unit circuit of the duplexer in FIG. 2;
  • 16 is a schematic cross-sectional view of the structure of the film bulk acoustic wave resonator
  • Figure 17 is a schematic cross-sectional view of the structure of a solid-state assembly acoustic wave piezoelectric resonator
  • Figure 18 is a schematic diagram of the LWR resonator.
  • FIG. 1 shows a schematic diagram of the existing duplexer structure.
  • the duplexer 100 includes a transmitting filter 101 and a receiving filter 102.
  • the transmitting filter 101 is connected between the transmitting terminal TX and the antenna terminal A1 to filter the transmitted wave and output it to the antenna terminal. More specifically, the transmitting filter 101 includes series resonators S10, S20, S30, and S40, parallel resonators P10, P20, and P30, and matching inductance elements L10, L20, and L30.
  • the series resonators S10, S20, S30, and S40 are connected in series with each other between the TX transmitting end and the antenna end A1, and the parallel resonators P10, P20, and P30 are connected to each other at each connection point of the series resonators S10, S20, S30, and S40.
  • the ground terminals are connected in parallel with each other.
  • the ladder filter is constituted by the above-mentioned connection of series resonators S10, S20, S30, and S40 and parallel resonators P10, P20, and P30.
  • the inductance elements L10, L20, and L30 are sequentially connected between the connection point of the parallel resonators P10, P20, and P30 and the ground terminal.
  • the receiving filter 102 is connected between the antenna terminal A1 and the receiving terminal RX, and receives the received wave from the antenna terminal, filters the received wave, and outputs the received wave to the receiving terminal RX. More specifically, the receiving filter 102 includes series resonators S11, S21, S31, and S41, parallel resonators P11, P21, P31, and P41, and matching inductance elements L11, L21, L31, and L41.
  • the series resonators S11, S21, S31, and S41 are connected in series between the antenna terminal A1 and the receiving terminal RX, and the parallel resonators P11, P21, P31, and P41 are connected to the receiving terminal RX, the series resonators S11, S21, S31 and The connection points of S41 and the ground terminal are connected in parallel with each other.
  • the ladder filter is constituted by the above-mentioned connection of the series resonators S11, S21, S31, and S41 and the parallel resonators P11, P21, P31, and P41.
  • the inductance elements L11, L21, L31, and L41 are sequentially connected between the connection point of the parallel resonators P11, P21, P31, and P41 and the ground terminal.
  • the antenna end adopts the common ground inductance Lm1 to realize the matching of the antenna end.
  • An inductor L1 is connected between the TX transmitting terminal and the transmitting filter 101, and an inductor L2 is connected between the TX transmitting terminal and the ground terminal.
  • An inductor L2 is connected between the receiving terminal RX and the receiving filter 102, and an inductor L4 is connected between the receiving terminal RX and the ground terminal.
  • the series resonators and parallel resonators of the receiving filter and the transmitting filter of the duplexer 100 are connected in a ladder form, and there is a connection between the antenna end nodes of the receiving filter and the transmitting filter and the antenna.
  • a parallel matching inductor Lm1 to ground realizes impedance matching at the antenna end.
  • FIG. 2 shows a schematic structural diagram of a duplexer involved in Embodiment 1 of the present application.
  • the duplexer 200 includes a transmitting filter 201, a receiving filter 202 and a tuning unit circuit 203.
  • the transmitting filter 201 is connected between the transmitting terminal TX and the antenna terminal A1 to filter the transmitted wave and output it to the antenna terminal. More specifically, the transmitting filter 201 includes series resonators S10, S20, S30, and S40, parallel resonators P10, P20, and P30, and matching inductance elements L10, L20, and L30.
  • the series resonators S10, S20, S30, and S40 are connected in series with each other between the TX transmitting end and the antenna end A1, and the parallel resonators P10, P20, and P30 are connected to each other at each connection point of the series resonators S10, S20, S30, and S40.
  • the ground terminals are connected in parallel with each other.
  • the above-mentioned connection of series resonators S10, S20, S30, and S40 and parallel resonators P10, P20, and P30 constitute a three-stage T-type filter.
  • the inductance elements L10, L20, and L30 are sequentially connected between the connection point of the parallel resonators P10, P20, and P30 and the ground terminal.
  • the tuning unit circuit 203 is connected in series between the antenna terminal A1 and the receiving filter 202.
  • the tuning unit circuit 203 includes a series tuning circuit consisting of a transmission line TL and an inductor L0 connected in series, and a parallel tuning circuit consisting of a resonator T10 and a capacitor C0 connected in parallel, one end of the series tuning circuit is connected to the antenna terminal A1, The other end of the series tuning circuit is connected to the signal input end of the receiving filter 202; one end of the parallel tuning circuit is connected to the connection point between the series tuning circuit and the receiving filter 202, and the other end of the parallel tuning circuit It is connected to one end of the grounding inductance L5, and the other end of the grounding inductance L5 is connected to the grounding end.
  • the series tuning circuit, the parallel tuning circuit and the grounding inductor together form the tuning circuit unit 203.
  • the receiving filter 202 is connected between the tuning unit circuit 203 and the receiving end RX, and receives the received wave from the antenna end, filters the received wave, and outputs the received wave to the receiving end RX. More specifically, the receiving filter 202 includes series resonators S11, S21, and S31, parallel resonators P11, P21, and P31, and matching inductance elements L11, L21, and L31.
  • the series resonators S11, S21, and S31 are connected in series with each other between the resonant unit circuit and the receiving terminal RX, and the parallel resonators P11, P21, and P31 are connected to each other at the receiving terminal RX, and the connection points of the series resonators S11, S21, and S31.
  • the ground terminals are connected in parallel with each other.
  • a three-stage L-type filter is formed by the above-mentioned connection of series resonators S11, S21, and S31 and parallel resonators P11, P21, and P31.
  • the inductance elements L11, L21, and L31 are sequentially connected between the connection point of the parallel resonators P11, P21, and P31 and the ground terminal.
  • An inductor L1 is connected between the TX transmitting terminal and the transmitting filter 201, and an inductor L2 is connected between the TX transmitting terminal and the ground terminal.
  • An inductor L2 is connected between the receiving terminal RX and the receiving filter 202, and an inductor L4 is connected between the receiving terminal RX and the ground terminal.
  • FIG. 3 shows the circuit structure diagram of the duplexer involved in the second embodiment of the present application.
  • the duplexer 300 includes a transmitting filter 301, a receiving filter 302 and a tuning unit circuit 303.
  • the transmitting filter 301 is connected between the transmitting terminal TX and the antenna terminal A1 to filter the transmitted wave and output it to the antenna terminal. More specifically, the transmitting filter 301 includes series resonators S10, S20, S30, and S40, parallel resonators P10, P20, and P30, and matching inductance elements L10, L20, and L30.
  • the series resonators S10, S20, S30, and S40 are connected in series with each other between the TX transmitting end and the antenna end A1, and the parallel resonators P10, P20, and P30 are connected between the connection points of the series resonators S10, S20, S30, and S40. Are connected in parallel with each other.
  • the above-mentioned connection of series resonators S10, S20, S30, and S40 and parallel resonators P10, P20, and P30 constitute a three-stage T-type filter.
  • the inductance elements L10, L20, and L30 are sequentially connected between the connection point of the parallel resonators P10, P20, and P30 and the ground terminal.
  • the tuning unit circuit 303 is connected in series between the antenna terminal A1 and the receiving filter 302.
  • the tuning unit circuit 303 includes a series tuning circuit composed of a transmission line TL, and a parallel tuning circuit composed of a resonator T10, one end of the series tuning circuit is connected to the antenna terminal A1, and the other end of the series tuning circuit is connected to the receiving filter
  • the series tuning circuit, the parallel tuning circuit and the grounding inductor together form a tuning circuit unit 303.
  • the receiving filter 302 is connected between the tuning unit circuit 303 and the receiving terminal RX, and receives the received wave from the antenna terminal, filters the received wave, and outputs it to the receiving terminal RX. More specifically, the receiving filter 302 includes series resonators S11, S21, and S31, parallel resonators P11, P21, and P31, and matching inductance elements L11, L21, and L31.
  • the series resonators S11, S21, and S31 are connected in series with each other between the resonant unit circuit and the receiving terminal RX, and the parallel resonators P11, P21, and P31 are connected to each other at the receiving terminal RX, and the connection points of the series resonators S11, S21, and S31.
  • the ground terminals are connected in parallel with each other.
  • a three-stage L-type filter is formed by the above-mentioned connection of series resonators S11, S21, and S31 and parallel resonators P11, P21, and P31.
  • the inductance elements L11, L21, and L31 are sequentially connected between the connection point of the parallel resonators P11, P21, and P31 and the ground terminal.
  • An inductor L1 is connected between the TX transmitting terminal and the transmitting filter 301, and an inductor L2 is connected between the TX transmitting terminal and the ground terminal.
  • An inductor L2 is connected between the receiving terminal RX and the receiving filter 302, and an inductor L4 is connected between the receiving terminal RX and the ground terminal.
  • FIG. 4 shows the circuit structure diagram of the duplexer involved in the third embodiment of the present application.
  • the duplexer 400 includes a transmitting filter 401, a receiving filter 402, and a tuning unit circuit 403.
  • the transmitting filter 401 is connected between the transmitting terminal TX and the antenna terminal A1 to filter the transmitted wave and output it to the antenna terminal. More specifically, the transmitting filter 401 includes series resonators S10, S20, S30, and S40, parallel resonators P10, P20, and P30, and matching inductance elements L10, L20, and L30.
  • the series resonators S10, S20, S30, and S40 are connected in series with each other between the TX transmitting end and the antenna end A1, and the parallel resonators P10, P20, and P30 are connected between the connection points of the series resonators S10, S20, S30, and S40. Are connected in parallel with each other.
  • the above-mentioned connection of series resonators S10, S20, S30, and S40 and parallel resonators P10, P20, and P30 constitute a three-stage T-type filter.
  • the inductance elements L10, L20, and L30 are sequentially connected between the connection point of the parallel resonators P10, P20, and P30 and the ground terminal.
  • the tuning unit circuit 403 is connected in series between the antenna terminal A1 and the receiving filter 402.
  • the tuning unit circuit 403 includes a series tuning circuit composed of a transmission line TL, and a parallel tuning circuit composed of a capacitor C0 and a resonator T10.
  • One end of the series tuning circuit is connected to the antenna terminal A1, and the other end of the series tuning circuit is connected to the antenna terminal A1.
  • the signal input terminal of the receiving filter 402; one end of the parallel tuning circuit is connected to the connection point between the series tuning circuit and the receiving filter 402, the other end of the parallel tuning circuit is connected to one end of the grounding inductor L5, the The other end of the grounding inductance L5 is connected to the grounding terminal.
  • the series tuning circuit, the parallel tuning circuit and the grounding inductor together form a tuning circuit unit 403.
  • the receiving filter 402 is connected between the tuning unit circuit 403 and the receiving end RX, and receives the received wave at the antenna end, filters the received wave, and outputs it to the receiving end RX. More specifically, the receiving filter 402 includes series resonators S11, S21, and S31, parallel resonators P11, P21, and P31, and matching inductance elements L11, L21, and L31.
  • the series resonators S11, S21, and S31 are connected in series with each other between the resonant unit circuit 403 and the receiving end RX, and the parallel resonators P11, P21, and P31 are connected at the receiving end RX, the series resonators S11, S21, and S31. It is connected in parallel with the ground terminal.
  • a three-stage L-type filter is formed by the above-mentioned connection of series resonators S11, S21, and S31 and parallel resonators P11, P21, and P31.
  • the inductance elements L11, L21, and L31 are sequentially connected between the connection point of the parallel resonators P11, P21, and P31 and the ground terminal.
  • An inductor L1 is connected between the TX transmitting terminal and the transmitting filter 401, and an inductor L2 is connected between the TX transmitting terminal and the ground terminal.
  • An inductor L2 is connected between the receiving terminal RX and the receiving filter 402, and an inductor L4 is connected between the receiving terminal RX and the ground terminal.
  • FIG. 5 shows a circuit structure diagram of the duplexer involved in the fourth embodiment of the present application.
  • the duplexer 500 includes a transmitting filter 501, a receiving filter 502 and a tuning unit circuit 503.
  • the transmitting filter 501 is connected between the transmitting terminal TX and the antenna terminal A1 to filter the transmitted wave and output it to the antenna terminal. More specifically, the transmitting filter 501 includes series resonators S10, S20, S30, and S40, parallel resonators P10, P20, and P30, and matching inductance elements L10, L20, and L30.
  • the series resonators S10, S20, S30, and S40 are connected in series with each other between the TX transmitting end and the antenna end A1, and the parallel resonators P10, P20, and P30 are connected between the connection points of the series resonators S10, S20, S30, and S40. Are connected in parallel with each other.
  • the above-mentioned connection of series resonators S10, S20, S30, and S40 and parallel resonators P10, P20, and P30 constitute a three-stage T-type filter.
  • the inductance elements L10, L20, and L30 are sequentially connected between the connection point of the parallel resonators P10, P20, and P30 and the ground terminal.
  • the tuning unit circuit 503 is connected in series between the antenna terminal A1 and the receiving filter 502.
  • the tuning unit circuit 503 includes a series tuning circuit composed of a transmission line TL1 and a transmission line TL2, and a parallel tuning circuit composed of a resonator T10, one end of the series tuning circuit is connected to the antenna terminal A1, and the other end of the series tuning circuit is connected to The signal input end of the receiving filter 502; one end of the parallel tuning circuit is connected to the connection point between the transmission line TL1 and the transmission line TL2, the other end of the parallel tuning circuit is connected to one end of the grounding inductance L5, the grounding inductance L5 Connect the other end to the ground terminal.
  • the series tuning circuit, the parallel tuning circuit and the grounding inductor together form a tuning circuit unit 503.
  • the receiving filter 502 is connected between the tuning unit circuit 503 and the receiving end RX, and receives the received wave from the antenna end, filters the received wave, and outputs the received wave to the receiving end RX. More specifically, the receiving filter 502 includes series resonators S11, S21, and S31, parallel resonators P11, P21, and P31, and matching inductance elements L11, L21, and L31.
  • the series resonators S11, S21, and S31 are connected in series with each other between the resonant unit circuit 503 and the receiving terminal RX, and the parallel resonators P11, P21, and P31 are connected at the receiving terminal RX and the series resonators S11, S21, and S31. It is connected in parallel with the ground terminal.
  • a three-stage L-type filter is formed by the above-mentioned connection of series resonators S11, S21, and S31 and parallel resonators P11, P21, and P31.
  • the inductance elements L11, L21, and L31 are sequentially connected between the connection point of the parallel resonators P11, P21, and P31 and the ground terminal.
  • An inductor L1 is connected between the TX transmitting terminal and the transmitting filter 501, and an inductor L2 is connected between the TX transmitting terminal and the ground terminal.
  • An inductor L2 is connected between the receiving terminal RX and the receiving filter 502, and an inductor L4 is connected between the receiving terminal RX and the ground terminal.
  • Figure 6(a) is the electrical symbol of the piezoelectric acoustic wave resonator
  • Figure 6(b) is the equivalent electrical model diagram.
  • the electrical model is simplified to a resonant circuit composed of Lm, Cm and C0 .
  • the resonant circuit has two resonant frequency points: one is fs when the impedance value of the resonant circuit reaches the minimum value, and fs is defined as the series resonance frequency point of the resonator; the other is when the impedance value of the resonant circuit reaches The maximum value of fp is defined as the parallel resonance frequency of the resonator;
  • Fig. 7 shows the relationship between the impedance of the resonator and the frequency. At a certain frequency, the greater the effective electromechanical coupling coefficient, the greater the frequency difference between fs and fp, that is, the farther away the two resonance frequency points are.
  • Figure 8 shows the impedance characteristics of the TX filter seen from the antenna end A1 in the range of 1GHz-2GHz when the tuning unit circuit is not added in the first embodiment.
  • the impedance at the corresponding frequency point of m9 is relatively small;
  • Figure 9 In order to add the tuning unit circuit, the TX filter sees the impedance characteristics from the antenna terminal A1.
  • the impedance at the corresponding frequency point of m9 is a maximum value, so after adding the tuning unit circuit, the low-frequency end m9 of the TX filter corresponds to the frequency point A zero point will be generated at the frequency band, so that the out-of-band suppression level of the frequency band here is significantly improved.
  • the position of the generated zero point can be adjusted in a wide range through the parameters of the tuning unit circuit.
  • the zero point tuning range is 0.45f0 ⁇ f ⁇ 0.8f 0 , where f 0 is the corresponding center frequency of the RX filter, and f is the frequency point where the zero point is generated.
  • FIG. 10 is a graph showing the insertion loss amplitude-frequency response curve of the transmission filter 201 of the existing duplexer 100 shown in FIG. 1 and the duplexer 200 related to Embodiment 1 of the present application shown in FIG.
  • the application is for the insertion loss curve of the transmitting filter 101 of the existing duplexer 100.
  • the solid line is the insertion loss curve of the transmitting filter 201 of the duplexer 200 in the first embodiment of the application.
  • the insertion loss curve of the transmitting filter 201 of the transmitter 200 produces a zero point at about 1.5 GHz, which can greatly improve the suppression level at this frequency band.
  • FIG. 11 is a graph showing the insertion loss amplitude-frequency response curve of the transmission filter corresponding to different transmission line TL electrical lengths in the tuning unit circuit 203 of the duplexer 200 in the first embodiment of the application, which can be achieved by adjusting the transmission line in the tuning unit circuit 203
  • the electrical length realizes the improvement of the out-of-band rejection within a certain frequency band of the transmitting filter.
  • FIG. 12 is a graph showing the insertion loss amplitude-frequency response curve of the transmission filter corresponding to the characteristic impedance of different transmission lines TL in the tuning unit circuit 203 of the duplexer 200 in the first embodiment of the application, which can be achieved by adjusting the transmission line in the tuning unit circuit 203
  • the characteristic impedance realizes the improvement of out-of-band rejection in a certain frequency band of the transmitting filter.
  • FIG. 13 is a graph showing the insertion loss amplitude-frequency response curve of the transmission filter corresponding to the different resonator T10 areas in the tuning unit circuit 203 of the duplexer 200 in the first embodiment of the application, which can be adjusted by adjusting the resonance in the tuning unit circuit 203
  • the area of the transmitter T10 realizes the improvement of the out-of-band rejection within a certain frequency band of the transmitting filter.
  • FIG. 14 is a graph showing the insertion loss amplitude-frequency response curve of the transmission filter corresponding to different capacitor C0 capacitance values in the tuning unit circuit 203 of the duplexer 200 in the first embodiment of the application, which can be achieved by adjusting the capacitor in the tuning unit circuit 203
  • the capacitance value of C0 realizes the improvement of out-of-band rejection in a certain frequency band of the transmitting filter.
  • the 15 is a graph showing the insertion loss amplitude-frequency response curve of the transmission filter corresponding to the inductance of different inductors L0 in the tuning unit circuit 203 of the duplexer 200 in the first embodiment of the application, which can be adjusted by adjusting the tuning unit circuit 203
  • the inductance of the inductor L0 realizes the improvement of the out-of-band suppression in a certain frequency band of the transmitting filter.
  • the resonator T10 in the duplexer involved in the first, second, third, and fourth embodiments is a bulk acoustic wave piezoelectric resonator with an air gap and a reflective layer with Bragg impedance.
  • the solid-state assembly acoustic wave piezoelectric resonator or LWR resonator.
  • 16 shows a schematic cross-sectional view of the thin film bulk acoustic resonator structure 600
  • 611 is a semiconductor substrate material
  • 601 is an air cavity obtained by etching
  • the bottom electrode 631 of the thin film bulk acoustic resonator is deposited on the semiconductor substrate 611
  • 621 is a piezoelectric film material
  • 641 is a top electrode
  • 651, 652, and 653 are the first layer mass load, the second layer mass load, and the third layer mass load of the film bulk acoustic wave resonator, respectively.
  • the area selected by the dashed line is the overlapping area of the 601 air cavity, the upper electrode of 631, the lower electrode of 641, the mass load, and the piezoelectric layer of 621. This area is the effective resonance area.
  • FIG. 17 shows a schematic cross-sectional view of a solid-state assembly acoustic wave piezoelectric resonator structure 700, using alternately stacked materials with high acoustic impedance 771, 772, 773, 774 and low acoustic impedance materials 761, 762, 763 to replace the one in FIG. 16
  • the thickness of the high acoustic impedance material and the low acoustic impedance material is a quarter of the acoustic wave wavelength, and the number of layers of the high acoustic impedance material and the low acoustic impedance material can be freely selected.
  • 751, 752, and 753 are the first layer mass load, the second layer mass load, and the third layer mass load of the solid-state assembly acoustic wave piezoelectric resonator, respectively.
  • Figure 18 shows that the LWR resonator includes a substrate 1, a cavity 2, a positive electrode 3, a negative electrode 4, and a piezoelectric layer dielectric.
  • the positive and negative electrodes are connected through interdigitated electrodes, and the dielectric layer is located between the positive and negative electrodes. Between the fingers.
  • This figure only shows the electrode structure of one layer. In fact, the three-dimensional structure of the LWR resonator is a sandwich structure.

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.

Description

一种双工器以及电子设备Duplexer and electronic equipment 技术领域Technical field
本发明涉及图像特征计算技术领域，特别地涉及一种双工器及电子设备。The present invention relates to the technical field of image feature calculation, in particular to a duplexer and electronic equipment.
背景技术Background technique
随着无线通讯应用的发展，人们对于数据传输速率的要求越来越高，与数据传输速率相对应的是频谱资源的高利用率和频谱的复杂化。通信协议的复杂化对于射频系统的各种性能提出了严格的要求，在射频前端模块，射频滤波器、双工器起着至关重要的作用，它可以将带外干扰和噪声滤除掉以满足射频系统和通信协议对于信噪比的要求。因此对滤波器、双工器性能的持续的改善有着非常迫切的需求。With the development of wireless communication applications, people have higher and higher requirements for data transmission rates. Corresponding to the data transmission rate is the high utilization of spectrum resources and the complexity of the spectrum. The complexity of the communication protocol puts forward strict requirements on the various performance of the radio frequency system. In the radio frequency front-end module, the radio frequency filter and duplexer play a vital role. It can filter out the out-of-band interference and noise. Meet the requirements of radio frequency systems and communication protocols for signal-to-noise ratio. Therefore, there is a very urgent need for continuous improvement of the performance of filters and duplexers.
射频滤波器、双工器主要应用于无线通信系统，例如，基站的射频前端，移动电话，电脑，卫星通讯，雷达，电子对抗系统等等。射频滤波器、双工器的主要性能指标为插损、带外抑制、功率容量、线性度、隔离度、器件尺寸和成本。良好的滤波器、双工器性能可以在一定程度上提高通信系统的数据传输速率、寿命及可靠性。所以对于无线通信系统高性能滤波器、双工器的设计是至关重要的。Radio frequency filters and duplexers are mainly used in wireless communication systems, such as radio frequency front-ends of base stations, mobile phones, computers, satellite communications, radars, electronic countermeasures systems, and so on. The main performance indicators of radio frequency filters and duplexers are insertion loss, out-of-band suppression, power capacity, linearity, isolation, device size and cost. Good filter and duplexer performance can improve the data transmission rate, life and reliability of the communication system to a certain extent. Therefore, the design of high-performance filters and duplexers for wireless communication systems is very important.
发明内容Summary of the invention
本发明提供一种双工器及电子设备，通过调谐单元电路可在发射滤波器低频端产生一个抑制零点，而且通过调节调谐单元电路中的设计参数实现在较宽的频带范围内零点位置的改变，从而在特定频段满足对发射滤波器带外抑制指标的要求。The present invention provides a duplexer and electronic equipment. A suppression zero point can be generated at the low frequency end of a transmission filter through a tuning unit circuit, and the zero point position can be changed in a wider frequency band by adjusting the design parameters of the tuning unit circuit , So as to meet the requirements of the out-of-band suppression index of the transmit filter in a specific frequency band.
本发明第一方面提供的一种双工器的技术方案是：The technical solution of a duplexer provided by the first aspect of the present invention is:
一种双工器，包括：发射滤波器和接收滤波器，所述发射滤波器和接收滤波器连接于天线端子，所述接收滤波器与天线端子之间串联 有调谐单元电路；A duplexer, comprising: a transmitting filter and a receiving filter, the transmitting filter and the receiving filter are connected to an antenna terminal, and a tuning unit circuit is connected in series between the receiving filter and the antenna terminal;
所述调谐单元电路包括连接在接收滤波器与天线端子之间的串联调谐电路以及连接在串联调谐电路和接收滤波器之间的连接点与接地端之间的并联调谐电路，所述并联谐振电路与接地端之间连接有电感。The tuning unit circuit includes a series tuning circuit connected between a receiving filter and an antenna terminal, and a parallel tuning circuit connected between a connection point between the series tuning circuit and the receiving filter and a ground terminal, the parallel resonant circuit An inductance is connected to the ground terminal.
可选的，所述串联调谐电路包括串联的阻抗变换器和电感器；Optionally, the series tuning circuit includes an impedance converter and an inductor connected in series;
或者，所述串联调谐电路包括阻抗变换器。Alternatively, the series tuning circuit includes an impedance converter.
所述阻抗变换器为传输线或者LC移相器。The impedance converter is a transmission line or an LC phase shifter.
可选的，所述并联调谐电路包括并联的谐振器和电容器；Optionally, the parallel tuning circuit includes a resonator and a capacitor connected in parallel;
或者，所述并联调谐电路包括串联的谐振器和电容器；Alternatively, the parallel tuning circuit includes a resonator and a capacitor connected in series;
或者，所述并联调谐电路包括谐振器。Alternatively, the parallel tuning circuit includes a resonator.
所述谐振器为体声波压电谐振器、固态装配体声波压电谐振器或LWR谐振器。The resonator is a bulk acoustic wave piezoelectric resonator, a solid assembly acoustic wave piezoelectric resonator, or an LWR resonator.
本发明第二方面提供的一种双工器的技术方案是：The technical solution of a duplexer provided by the second aspect of the present invention is:
一种双工器，包括：发射滤波器和接收滤波器，所述发射滤波器和接收滤波器连接于天线端子，所述接收滤波器与天线端子之间串联有调谐单元电路；A duplexer, comprising: a transmitting filter and a receiving filter, the transmitting filter and the receiving filter are connected to an antenna terminal, and a tuning unit circuit is connected in series between the receiving filter and the antenna terminal;
所述调谐单元电路包括串联调谐电路和并联调谐电路，所述串联调谐电路包括至少两个串联在接收滤波器与天线端子之间的阻抗变换器；所述并联调谐电路连接在两个串联的阻抗变换器的连接点与接地端之间，所述并联谐振电路与接地端之间连接有电感。The tuning unit circuit includes a series tuning circuit and a parallel tuning circuit. The series tuning circuit includes at least two impedance converters connected in series between the receiving filter and the antenna terminal; the parallel tuning circuit is connected to two series impedances. Between the connection point of the converter and the ground terminal, an inductance is connected between the parallel resonant circuit and the ground terminal.
可选的，所述阻抗变换器为传输线或者LC移相器。Optionally, the impedance converter is a transmission line or an LC phase shifter.
所述并联调谐电路包括并联的谐振器和电容器；The parallel tuning circuit includes a parallel resonator and a capacitor;
或者，所述并联调谐电路包括串联的谐振器和电容器；Alternatively, the parallel tuning circuit includes a resonator and a capacitor connected in series;
或者，所述并联调谐电路包括谐振器；Alternatively, the parallel tuning circuit includes a resonator;
所述谐振器为体声波压电谐振器、固态装配体声波压电谐振器或LWR谐振器。The resonator is a bulk acoustic wave piezoelectric resonator, a solid assembly acoustic wave piezoelectric resonator, or an LWR resonator.
本发明第三方面提供的一种电子设备的技术方案是：The technical solution of an electronic device provided by the third aspect of the present invention is:
一种电子设备，包括本发明中的双工器。An electronic device includes the duplexer in the present invention.
与现有技术相比,本发明的有益效果是：Compared with the prior art, the beneficial effects of the present invention are:
(1)本发明引入调谐单元电路，该调谐单元电路结构具有调 谐参数更多，调谐范围更大的优点；(1) The present invention introduces a tuning unit circuit, and the tuning unit circuit structure has the advantages of more tuning parameters and a larger tuning range;
(2)本发明引入的调谐单元电路中具有谐振器，该谐振器可以加质量负载，也可以不加质量负载，使得参数调节的灵活性更高。(2) The tuning unit circuit introduced in the present invention has a resonator, and the resonator can be loaded with or without a mass load, so that the flexibility of parameter adjustment is higher.
附图说明Description of the drawings
附图用于更好地理解本发明，不构成对本发明的不当限定。其中：The drawings are used to better understand the present invention, and do not constitute an improper limitation of the present invention. among them:
图1是现有技术中的双工器的结构示意图；Figure 1 is a schematic structural diagram of a duplexer in the prior art;
图2是实施例一的双工器的结构示意图；2 is a schematic diagram of the structure of the duplexer of the first embodiment;
图3是实施例二的双工器的结构示意图；3 is a schematic diagram of the structure of the duplexer of the second embodiment;
图4是实施例三的双工器的结构示意图；4 is a schematic diagram of the structure of the duplexer of the third embodiment;
图5是实施例四的双工器的结构示意图；FIG. 5 is a schematic diagram of the structure of the duplexer of the fourth embodiment;
图6(a)是压电声波谐振器的电学符号；Figure 6(a) is the electrical symbol of the piezoelectric acoustic resonator;
图6(b)是压电声波谐振器的等效电学模型图；Figure 6(b) is the equivalent electrical model diagram of the piezoelectric acoustic wave resonator;
图7是图6所示谐振器的阻抗频率特性曲线图；Fig. 7 is an impedance frequency characteristic curve diagram of the resonator shown in Fig. 6;
图8是图2中双工器在没有调谐单元电路作用下的1GHz到2GHz范围内发射滤波器天线端的输入特性阻抗；Fig. 8 is the input characteristic impedance of the antenna end of the transmitting filter in the range of 1 GHz to 2 GHz without the function of the tuning unit circuit of the duplexer in Fig. 2;
图9是图2中双工器在在调谐单元电路作用下的1GHz到2GHz范围内发射滤波器天线端的输入特性阻抗；Fig. 9 is the input characteristic impedance of the antenna end of the transmitting filter in the range of 1 GHz to 2 GHz under the action of the tuning unit circuit of the duplexer in Fig. 2;
图10是示例性曲线图，其中，实线对应图2中双工器中发射滤波器的输入输出传输的频率特性曲线，虚线对应图1中双工器中发射滤波器的输入输出传输的频率特性曲线；Fig. 10 is an exemplary graph, in which the solid line corresponds to the frequency characteristic curve of the input and output transmission of the transmitting filter in the duplexer in Fig. 2 and the dashed line corresponds to the frequency characteristic of the input and output transmission of the transmitting filter in the duplexer in Fig. 1 Characteristic curve
图11是图2中双工器的调谐单元电路不同传输线的电长度对应双工器中发射滤波器的输入输出传输的频率特性曲线；11 is the frequency characteristic curve of the input and output transmission of the transmitting filter in the duplexer corresponding to the electrical lengths of the different transmission lines of the tuning unit circuit of the duplexer in FIG. 2;
图12是图2中双工器的调谐单元电路不同传输线的特征阻抗对应双工器中发射滤波器的输入输出传输的频率特性曲线；12 is the frequency characteristic curve of the characteristic impedance of different transmission lines of the tuning unit circuit of the duplexer in FIG. 2 corresponding to the input and output transmission of the transmitting filter in the duplexer;
图13是图2中双工器的调谐单元电路不同谐振器的面积对应双工器中发射滤波器的输入输出传输的频率特性曲线；13 is the frequency characteristic curve of the input and output transmission of the transmitting filter in the duplexer corresponding to the area of different resonators of the tuning unit circuit of the duplexer in FIG. 2;
图14是图2中双工器的调谐单元电路不同电感器的电感量对应双工器中发射滤波器的输入输出传输的频率特性曲线；14 is the frequency characteristic curve of the inductance of different inductors of the tuning unit circuit of the duplexer in FIG. 2 corresponding to the input and output transmission of the transmitting filter in the duplexer;
图15是图2中双工器的调谐单元电路不同电容器的容值对应双工器中发射滤波器的输入输出传输的频率特性曲线；15 is the frequency characteristic curve of the input and output transmission of the transmitting filter in the duplexer corresponding to the capacitance of different capacitors of the tuning unit circuit of the duplexer in FIG. 2;
图16是薄膜体声波谐振器结构的剖面示意图；16 is a schematic cross-sectional view of the structure of the film bulk acoustic wave resonator;
图17是固态装配体声波压电谐振器结构的剖面示意图；Figure 17 is a schematic cross-sectional view of the structure of a solid-state assembly acoustic wave piezoelectric resonator;
图18为LWR谐振器示意图。Figure 18 is a schematic diagram of the LWR resonator.
具体实施方式Detailed ways
下面结合附图与实施例对本发明作进一步说明。The present invention will be further described below in conjunction with the drawings and embodiments.
图1示出了现有的双工器结构示意图。如图1所示，所述双工器100包括发射滤波器101和接收滤波器102。Figure 1 shows a schematic diagram of the existing duplexer structure. As shown in FIG. 1, the duplexer 100 includes a transmitting filter 101 and a receiving filter 102.
所述发射滤波器101连接在发射端TX与天线端A1之间，将发射波进行滤波，并输出至天线端。更为具体而言，所述发射滤波器101包括串联谐振器S10、S20、S30和S40，并联谐振器P10、P20和P30，匹配用的电感元件L10、L20和L30。The transmitting filter 101 is connected between the transmitting terminal TX and the antenna terminal A1 to filter the transmitted wave and output it to the antenna terminal. More specifically, the transmitting filter 101 includes series resonators S10, S20, S30, and S40, parallel resonators P10, P20, and P30, and matching inductance elements L10, L20, and L30.
所述串联谐振器S10、S20、S30和S40在TX发射端和天线端A1之间彼此串联连接，并联谐振器P10、P20和P30在串联谐振器S10、S20、S30和S40的各连接点与接地端之间相互并联连接。通过串联谐振器S10、S20、S30和S40以及并联谐振器P10、P20和P30的上述连接构成了梯形滤波器。此外，电感元件L10、L20和L30被依次连接在并联谐振器P10、P20及P30的连接点与接地端之间。The series resonators S10, S20, S30, and S40 are connected in series with each other between the TX transmitting end and the antenna end A1, and the parallel resonators P10, P20, and P30 are connected to each other at each connection point of the series resonators S10, S20, S30, and S40. The ground terminals are connected in parallel with each other. The ladder filter is constituted by the above-mentioned connection of series resonators S10, S20, S30, and S40 and parallel resonators P10, P20, and P30. In addition, the inductance elements L10, L20, and L30 are sequentially connected between the connection point of the parallel resonators P10, P20, and P30 and the ground terminal.
所述接收滤波器102连接在天线端A1与接收端RX之间，将接收天线端的接收波，对该接收波进行滤波并输出至接收端RX。更为具体而言，所述接收滤波器102包括串联谐振器S11、S21、S31和S41，并联谐振器P11、P21、P31和P41，以及匹配用的电感元件L11、L21、L31和L41。The receiving filter 102 is connected between the antenna terminal A1 and the receiving terminal RX, and receives the received wave from the antenna terminal, filters the received wave, and outputs the received wave to the receiving terminal RX. More specifically, the receiving filter 102 includes series resonators S11, S21, S31, and S41, parallel resonators P11, P21, P31, and P41, and matching inductance elements L11, L21, L31, and L41.
所述串联谐振器S11、S21、S31和S41在天线端A1与接收端RX之间彼此串联连接，并联谐振器P11、P21、P31和P41在接收端RX、串联谐振器S11、S21、S31和S41的各连接点与接地端之间相互并联连接。通过串联谐振器S11、S21、S31和S41以及并联谐振器P11、P21、P31和P41的上述连接构成了梯形滤波器。此外，电感元件L11、 L21、L31和L41被依次连接在并联谐振器P11、P21、P31和P41的连接点与接地端之间。The series resonators S11, S21, S31, and S41 are connected in series between the antenna terminal A1 and the receiving terminal RX, and the parallel resonators P11, P21, P31, and P41 are connected to the receiving terminal RX, the series resonators S11, S21, S31 and The connection points of S41 and the ground terminal are connected in parallel with each other. The ladder filter is constituted by the above-mentioned connection of the series resonators S11, S21, S31, and S41 and the parallel resonators P11, P21, P31, and P41. In addition, the inductance elements L11, L21, L31, and L41 are sequentially connected between the connection point of the parallel resonators P11, P21, P31, and P41 and the ground terminal.
其中，天线端采用共地电感Lm1实现天线端的匹配。所述TX发射端与发射滤波器101之间连接电感L1，所述TX发射端与接地端之间连接有电感L2。所述接收端RX与接收滤波器102之间连接电感L2，所述接收端RX与接地端之间连接有电感L4。Among them, the antenna end adopts the common ground inductance Lm1 to realize the matching of the antenna end. An inductor L1 is connected between the TX transmitting terminal and the transmitting filter 101, and an inductor L2 is connected between the TX transmitting terminal and the ground terminal. An inductor L2 is connected between the receiving terminal RX and the receiving filter 102, and an inductor L4 is connected between the receiving terminal RX and the ground terminal.
如图1所示，所述双工器100的接收滤波器和发射滤波器的串联谐振器和并联谐振器均通过梯形形式连接，接收滤波器和发射滤波器的天线端节点与天线之间有一个对地的并联匹配电感Lm1，实现天线端的阻抗匹配。As shown in Figure 1, the series resonators and parallel resonators of the receiving filter and the transmitting filter of the duplexer 100 are connected in a ladder form, and there is a connection between the antenna end nodes of the receiving filter and the transmitting filter and the antenna. A parallel matching inductor Lm1 to ground realizes impedance matching at the antenna end.
图2示出了本申请实施例一涉及的双工器的结构示意图。如图2所示，所述双工器200包括发射滤波器201、接收滤波器202以及调谐单元电路203。FIG. 2 shows a schematic structural diagram of a duplexer involved in Embodiment 1 of the present application. As shown in FIG. 2, the duplexer 200 includes a transmitting filter 201, a receiving filter 202 and a tuning unit circuit 203.
所述发射滤波器201连接在发射端TX与天线端A1之间，将发射波进行滤波，并输出至天线端。更为具体而言，所述发射滤波器201包括串联谐振器S10、S20、S30和S40，并联谐振器P10、P20和P30，匹配用的电感元件L10、L20和L30。The transmitting filter 201 is connected between the transmitting terminal TX and the antenna terminal A1 to filter the transmitted wave and output it to the antenna terminal. More specifically, the transmitting filter 201 includes series resonators S10, S20, S30, and S40, parallel resonators P10, P20, and P30, and matching inductance elements L10, L20, and L30.
所述串联谐振器S10、S20、S30和S40在TX发射端和天线端A1之间彼此串联连接，并联谐振器P10、P20和P30在串联谐振器S10、S20、S30和S40的各连接点与接地端之间相互并联连接。通过串联谐振器S10、S20、S30和S40以及并联谐振器P10、P20和P30的上述连接构成了三级T型滤波器。此外，电感元件L10、L20和L30被依次连接在并联谐振器P10、P20及P30的连接点与接地端之间。The series resonators S10, S20, S30, and S40 are connected in series with each other between the TX transmitting end and the antenna end A1, and the parallel resonators P10, P20, and P30 are connected to each other at each connection point of the series resonators S10, S20, S30, and S40. The ground terminals are connected in parallel with each other. The above-mentioned connection of series resonators S10, S20, S30, and S40 and parallel resonators P10, P20, and P30 constitute a three-stage T-type filter. In addition, the inductance elements L10, L20, and L30 are sequentially connected between the connection point of the parallel resonators P10, P20, and P30 and the ground terminal.
所述谐调单元电路203串联在天线端A1和接收滤波器202之间。该调谐单元电路203包括由传输线TL与电感器L0串联相接组成串联调谐电路，以及由谐振器T10与电容器C0并联相接组成并联调谐电路，所述串联调谐电路的一端连接到天线端A1，所述串联调谐电路的另一端连接到接收滤波器202的信号输入端；所述并联调谐电路的一端连接到串联调谐电路与接收滤波器202之间的连接点，所述并联调谐电路的另一端与接地电感L5的一端相连，所述接地电感L5的另一端连 接到接地端。所述串联调谐电路、并联调谐电路和接地电感共同组成调谐电路单元203。The tuning unit circuit 203 is connected in series between the antenna terminal A1 and the receiving filter 202. The tuning unit circuit 203 includes a series tuning circuit consisting of a transmission line TL and an inductor L0 connected in series, and a parallel tuning circuit consisting of a resonator T10 and a capacitor C0 connected in parallel, one end of the series tuning circuit is connected to the antenna terminal A1, The other end of the series tuning circuit is connected to the signal input end of the receiving filter 202; one end of the parallel tuning circuit is connected to the connection point between the series tuning circuit and the receiving filter 202, and the other end of the parallel tuning circuit It is connected to one end of the grounding inductance L5, and the other end of the grounding inductance L5 is connected to the grounding end. The series tuning circuit, the parallel tuning circuit and the grounding inductor together form the tuning circuit unit 203.
所述接收滤波器202连接在谐调单元电路203与接收端RX之间，将接收天线端的接收波，对该接收波进行滤波并输出至接收端RX。更为具体而言，所述接收滤波器202包括串联谐振器S11、S21和S31，并联谐振器P11、P21和P31，以及匹配用的电感元件L11、L21和L31。The receiving filter 202 is connected between the tuning unit circuit 203 and the receiving end RX, and receives the received wave from the antenna end, filters the received wave, and outputs the received wave to the receiving end RX. More specifically, the receiving filter 202 includes series resonators S11, S21, and S31, parallel resonators P11, P21, and P31, and matching inductance elements L11, L21, and L31.
所述串联谐振器S11、S21和S31在谐振单元电路与接收端RX之间彼此串联连接，并联谐振器P11、P21和P31在接收端RX、串联谐振器S11、S21和S31的各连接点与接地端之间相互并联连接。通过串联谐振器S11、S21和S31以及并联谐振器P11、P21和P31的上述连接构成了三级L型滤波器。此外，电感元件L11、L21和L31被依次连接在并联谐振器P11、P21和P31的连接点与接地端之间。The series resonators S11, S21, and S31 are connected in series with each other between the resonant unit circuit and the receiving terminal RX, and the parallel resonators P11, P21, and P31 are connected to each other at the receiving terminal RX, and the connection points of the series resonators S11, S21, and S31. The ground terminals are connected in parallel with each other. A three-stage L-type filter is formed by the above-mentioned connection of series resonators S11, S21, and S31 and parallel resonators P11, P21, and P31. In addition, the inductance elements L11, L21, and L31 are sequentially connected between the connection point of the parallel resonators P11, P21, and P31 and the ground terminal.
所述TX发射端与发射滤波器201之间连接电感L1，所述TX发射端与接地端之间连接有电感L2。所述接收端RX与接收滤波器202之间连接电感L2，所述接收端RX与接地端之间连接有电感L4。An inductor L1 is connected between the TX transmitting terminal and the transmitting filter 201, and an inductor L2 is connected between the TX transmitting terminal and the ground terminal. An inductor L2 is connected between the receiving terminal RX and the receiving filter 202, and an inductor L4 is connected between the receiving terminal RX and the ground terminal.
图3示出了本申请实施例二涉及的双工器的电路结构图。如图3所示，所述双工器300包括发射滤波器301、接收滤波器302以及调谐单元电路303。FIG. 3 shows the circuit structure diagram of the duplexer involved in the second embodiment of the present application. As shown in FIG. 3, the duplexer 300 includes a transmitting filter 301, a receiving filter 302 and a tuning unit circuit 303.
所述发射滤波器301连接在发射端TX与天线端A1之间，将发射波进行滤波，并输出至天线端。更为具体而言，所述发射滤波器301包括串联谐振器S10、S20、S30和S40，并联谐振器P10、P20和P30，匹配用的电感元件L10、L20和L30。The transmitting filter 301 is connected between the transmitting terminal TX and the antenna terminal A1 to filter the transmitted wave and output it to the antenna terminal. More specifically, the transmitting filter 301 includes series resonators S10, S20, S30, and S40, parallel resonators P10, P20, and P30, and matching inductance elements L10, L20, and L30.
所述串联谐振器S10、S20、S30和S40在TX发射端和天线端A1之间彼此串联连接，并联谐振器P10、P20和P30在串联谐振器S10、S20、S30和S40的各连接点之间相互并联连接。通过串联谐振器S10、S20、S30和S40以及并联谐振器P10、P20和P30的上述连接构成了三级T型滤波器。此外，电感元件L10、L20和L30被依次连接在并联谐振器P10、P20及P30的连接点与接地端之间。The series resonators S10, S20, S30, and S40 are connected in series with each other between the TX transmitting end and the antenna end A1, and the parallel resonators P10, P20, and P30 are connected between the connection points of the series resonators S10, S20, S30, and S40. Are connected in parallel with each other. The above-mentioned connection of series resonators S10, S20, S30, and S40 and parallel resonators P10, P20, and P30 constitute a three-stage T-type filter. In addition, the inductance elements L10, L20, and L30 are sequentially connected between the connection point of the parallel resonators P10, P20, and P30 and the ground terminal.
所述谐调单元电路303串联在天线端A1和接收滤波器302之间。该调谐单元电路303包括由传输线TL组成串联调谐电路，以及由谐振 器T10组成并联调谐电路，所述串联调谐电路的一端连接到天线端A1，所述串联调谐电路的另一端连接到接收滤波器302的信号输入端；所述并联调谐电路的一端连接到串联调谐电路与接收滤波器302之间的连接点，所述并联调谐电路的另一端与接地电感L5的一端相连，所述接地电感L5的另一端连接到接地端。所述串联调谐电路、并联调谐电路和接地电感共同组成调谐电路单元303。The tuning unit circuit 303 is connected in series between the antenna terminal A1 and the receiving filter 302. The tuning unit circuit 303 includes a series tuning circuit composed of a transmission line TL, and a parallel tuning circuit composed of a resonator T10, one end of the series tuning circuit is connected to the antenna terminal A1, and the other end of the series tuning circuit is connected to the receiving filter The signal input terminal of 302; one end of the parallel tuning circuit is connected to the connection point between the series tuning circuit and the receiving filter 302, the other end of the parallel tuning circuit is connected to one end of the grounding inductance L5, the grounding inductance L5 Connect the other end to the ground terminal. The series tuning circuit, the parallel tuning circuit and the grounding inductor together form a tuning circuit unit 303.
所述接收滤波器302连接在谐调单元电路303与接收端RX之间，将接收天线端的接收波，对该接收波进行滤波并输出至接收端RX。更为具体而言，所述接收滤波器302包括串联谐振器S11、S21和S31，并联谐振器P11、P21和P31，以及匹配用的电感元件L11、L21和L31。The receiving filter 302 is connected between the tuning unit circuit 303 and the receiving terminal RX, and receives the received wave from the antenna terminal, filters the received wave, and outputs it to the receiving terminal RX. More specifically, the receiving filter 302 includes series resonators S11, S21, and S31, parallel resonators P11, P21, and P31, and matching inductance elements L11, L21, and L31.
所述串联谐振器S11、S21和S31在谐振单元电路与接收端RX之间彼此串联连接，并联谐振器P11、P21和P31在接收端RX、串联谐振器S11、S21和S31的各连接点与接地端之间相互并联连接。通过串联谐振器S11、S21和S31以及并联谐振器P11、P21和P31的上述连接构成了三级L型滤波器。此外，电感元件L11、L21和L31被依次连接在并联谐振器P11、P21和P31的连接点与接地端之间。The series resonators S11, S21, and S31 are connected in series with each other between the resonant unit circuit and the receiving terminal RX, and the parallel resonators P11, P21, and P31 are connected to each other at the receiving terminal RX, and the connection points of the series resonators S11, S21, and S31. The ground terminals are connected in parallel with each other. A three-stage L-type filter is formed by the above-mentioned connection of series resonators S11, S21, and S31 and parallel resonators P11, P21, and P31. In addition, the inductance elements L11, L21, and L31 are sequentially connected between the connection point of the parallel resonators P11, P21, and P31 and the ground terminal.
所述TX发射端与发射滤波器301之间连接电感L1，所述TX发射端与接地端之间连接有电感L2。所述接收端RX与接收滤波器302之间连接电感L2，所述接收端RX与接地端之间连接有电感L4。An inductor L1 is connected between the TX transmitting terminal and the transmitting filter 301, and an inductor L2 is connected between the TX transmitting terminal and the ground terminal. An inductor L2 is connected between the receiving terminal RX and the receiving filter 302, and an inductor L4 is connected between the receiving terminal RX and the ground terminal.
图4示出了本申请实施例三涉及的双工器的电路结构图。如图4所示，所述双工器400包括发射滤波器401、接收滤波器402以及调谐单元电路403。FIG. 4 shows the circuit structure diagram of the duplexer involved in the third embodiment of the present application. As shown in FIG. 4, the duplexer 400 includes a transmitting filter 401, a receiving filter 402, and a tuning unit circuit 403.
所述发射滤波器401连接在发射端TX与天线端A1之间，将发射波进行滤波，并输出至天线端。更为具体而言，所述发射滤波器401包括串联谐振器S10、S20、S30和S40，并联谐振器P10、P20和P30，匹配用的电感元件L10、L20和L30。The transmitting filter 401 is connected between the transmitting terminal TX and the antenna terminal A1 to filter the transmitted wave and output it to the antenna terminal. More specifically, the transmitting filter 401 includes series resonators S10, S20, S30, and S40, parallel resonators P10, P20, and P30, and matching inductance elements L10, L20, and L30.
所述串联谐振器S10、S20、S30和S40在TX发射端和天线端A1之间彼此串联连接，并联谐振器P10、P20和P30在串联谐振器S10、S20、S30和S40的各连接点之间相互并联连接。通过串联谐振器S10、S20、S30和S40以及并联谐振器P10、P20和P30的上述连接构成了 三级T型滤波器。此外，电感元件L10、L20和L30被依次连接在并联谐振器P10、P20及P30的连接点与接地端之间。The series resonators S10, S20, S30, and S40 are connected in series with each other between the TX transmitting end and the antenna end A1, and the parallel resonators P10, P20, and P30 are connected between the connection points of the series resonators S10, S20, S30, and S40. Are connected in parallel with each other. The above-mentioned connection of series resonators S10, S20, S30, and S40 and parallel resonators P10, P20, and P30 constitute a three-stage T-type filter. In addition, the inductance elements L10, L20, and L30 are sequentially connected between the connection point of the parallel resonators P10, P20, and P30 and the ground terminal.
所述谐调单元电路403串联在天线端A1和接收滤波器402之间。该调谐单元电路403包括由传输线TL组成串联调谐电路，以及由电容器C0和谐振器T10组成并联调谐电路，所述串联调谐电路的一端连接到天线端A1，所述串联调谐电路的另一端连接到接收滤波器402的信号输入端；所述并联调谐电路的一端连接到串联调谐电路与接收滤波器402之间的连接点，所述并联调谐电路的另一端与接地电感L5的一端相连，所述接地电感L5的另一端连接到接地端。所述串联调谐电路、并联调谐电路和接地电感共同组成调谐电路单元403。The tuning unit circuit 403 is connected in series between the antenna terminal A1 and the receiving filter 402. The tuning unit circuit 403 includes a series tuning circuit composed of a transmission line TL, and a parallel tuning circuit composed of a capacitor C0 and a resonator T10. One end of the series tuning circuit is connected to the antenna terminal A1, and the other end of the series tuning circuit is connected to the antenna terminal A1. The signal input terminal of the receiving filter 402; one end of the parallel tuning circuit is connected to the connection point between the series tuning circuit and the receiving filter 402, the other end of the parallel tuning circuit is connected to one end of the grounding inductor L5, the The other end of the grounding inductance L5 is connected to the grounding terminal. The series tuning circuit, the parallel tuning circuit and the grounding inductor together form a tuning circuit unit 403.
所述接收滤波器402连接在谐调单元电路403与接收端RX之间，将接收天线端的接收波，对该接收波进行滤波并输出至接收端RX。更为具体而言，所述接收滤波器402包括串联谐振器S11、S21和S31，并联谐振器P11、P21和P31，以及匹配用的电感元件L11、L21和L31。The receiving filter 402 is connected between the tuning unit circuit 403 and the receiving end RX, and receives the received wave at the antenna end, filters the received wave, and outputs it to the receiving end RX. More specifically, the receiving filter 402 includes series resonators S11, S21, and S31, parallel resonators P11, P21, and P31, and matching inductance elements L11, L21, and L31.
所述串联谐振器S11、S21和S31在谐振单元电路403与接收端RX之间彼此串联连接，并联谐振器P11、P21和P31在接收端RX、串联谐振器S11、S21和S31的各连接点与接地端之间相互并联连接。通过串联谐振器S11、S21和S31以及并联谐振器P11、P21和P31的上述连接构成了三级L型滤波器。此外，电感元件L11、L21和L31被依次连接在并联谐振器P11、P21和P31的连接点与接地端之间。The series resonators S11, S21, and S31 are connected in series with each other between the resonant unit circuit 403 and the receiving end RX, and the parallel resonators P11, P21, and P31 are connected at the receiving end RX, the series resonators S11, S21, and S31. It is connected in parallel with the ground terminal. A three-stage L-type filter is formed by the above-mentioned connection of series resonators S11, S21, and S31 and parallel resonators P11, P21, and P31. In addition, the inductance elements L11, L21, and L31 are sequentially connected between the connection point of the parallel resonators P11, P21, and P31 and the ground terminal.
所述TX发射端与发射滤波器401之间连接电感L1，所述TX发射端与接地端之间连接有电感L2。所述接收端RX与接收滤波器402之间连接电感L2，所述接收端RX与接地端之间连接有电感L4。An inductor L1 is connected between the TX transmitting terminal and the transmitting filter 401, and an inductor L2 is connected between the TX transmitting terminal and the ground terminal. An inductor L2 is connected between the receiving terminal RX and the receiving filter 402, and an inductor L4 is connected between the receiving terminal RX and the ground terminal.
图5示出了本申请实施例四涉及的双工器的电路结构图。如图4所示，所述双工器500包括发射滤波器501、接收滤波器502以及调谐单元电路503。FIG. 5 shows a circuit structure diagram of the duplexer involved in the fourth embodiment of the present application. As shown in FIG. 4, the duplexer 500 includes a transmitting filter 501, a receiving filter 502 and a tuning unit circuit 503.
所述发射滤波器501连接在发射端TX与天线端A1之间，将发射波进行滤波，并输出至天线端。更为具体而言，所述发射滤波器501包括串联谐振器S10、S20、S30和S40，并联谐振器P10、P20和P30，匹配用的电感元件L10、L20和L30。The transmitting filter 501 is connected between the transmitting terminal TX and the antenna terminal A1 to filter the transmitted wave and output it to the antenna terminal. More specifically, the transmitting filter 501 includes series resonators S10, S20, S30, and S40, parallel resonators P10, P20, and P30, and matching inductance elements L10, L20, and L30.
所述串联谐振器S10、S20、S30和S40在TX发射端和天线端A1之间彼此串联连接，并联谐振器P10、P20和P30在串联谐振器S10、S20、S30和S40的各连接点之间相互并联连接。通过串联谐振器S10、S20、S30和S40以及并联谐振器P10、P20和P30的上述连接构成了三级T型滤波器。此外，电感元件L10、L20和L30被依次连接在并联谐振器P10、P20及P30的连接点与接地端之间。The series resonators S10, S20, S30, and S40 are connected in series with each other between the TX transmitting end and the antenna end A1, and the parallel resonators P10, P20, and P30 are connected between the connection points of the series resonators S10, S20, S30, and S40. Are connected in parallel with each other. The above-mentioned connection of series resonators S10, S20, S30, and S40 and parallel resonators P10, P20, and P30 constitute a three-stage T-type filter. In addition, the inductance elements L10, L20, and L30 are sequentially connected between the connection point of the parallel resonators P10, P20, and P30 and the ground terminal.
所述谐调单元电路503串联在天线端A1和接收滤波器502之间。该调谐单元电路503包括由传输线TL1和传输线TL2组成串联调谐电路，以及由谐振器T10组成并联调谐电路，所述串联调谐电路的一端连接到天线端A1，所述串联调谐电路的另一端连接到接收滤波器502的信号输入端；所述并联调谐电路的一端连接到传输线TL1与传输线TL2之间的连接点，所述并联调谐电路的另一端与接地电感L5的一端相连，所述接地电感L5的另一端连接到接地端。所述串联调谐电路、并联调谐电路和接地电感共同组成调谐电路单元503。The tuning unit circuit 503 is connected in series between the antenna terminal A1 and the receiving filter 502. The tuning unit circuit 503 includes a series tuning circuit composed of a transmission line TL1 and a transmission line TL2, and a parallel tuning circuit composed of a resonator T10, one end of the series tuning circuit is connected to the antenna terminal A1, and the other end of the series tuning circuit is connected to The signal input end of the receiving filter 502; one end of the parallel tuning circuit is connected to the connection point between the transmission line TL1 and the transmission line TL2, the other end of the parallel tuning circuit is connected to one end of the grounding inductance L5, the grounding inductance L5 Connect the other end to the ground terminal. The series tuning circuit, the parallel tuning circuit and the grounding inductor together form a tuning circuit unit 503.
所述接收滤波器502连接在谐调单元电路503与接收端RX之间，将接收天线端的接收波，对该接收波进行滤波并输出至接收端RX。更为具体而言，所述接收滤波器502包括串联谐振器S11、S21和S31，并联谐振器P11、P21和P31，以及匹配用的电感元件L11、L21和L31。The receiving filter 502 is connected between the tuning unit circuit 503 and the receiving end RX, and receives the received wave from the antenna end, filters the received wave, and outputs the received wave to the receiving end RX. More specifically, the receiving filter 502 includes series resonators S11, S21, and S31, parallel resonators P11, P21, and P31, and matching inductance elements L11, L21, and L31.
所述串联谐振器S11、S21和S31在谐振单元电路503与接收端RX之间彼此串联连接，并联谐振器P11、P21和P31在接收端RX、串联谐振器S11、S21和S31的各连接点与接地端之间相互并联连接。通过串联谐振器S11、S21和S31以及并联谐振器P11、P21和P31的上述连接构成了三级L型滤波器。此外，电感元件L11、L21和L31被依次连接在并联谐振器P11、P21和P31的连接点与接地端之间。The series resonators S11, S21, and S31 are connected in series with each other between the resonant unit circuit 503 and the receiving terminal RX, and the parallel resonators P11, P21, and P31 are connected at the receiving terminal RX and the series resonators S11, S21, and S31. It is connected in parallel with the ground terminal. A three-stage L-type filter is formed by the above-mentioned connection of series resonators S11, S21, and S31 and parallel resonators P11, P21, and P31. In addition, the inductance elements L11, L21, and L31 are sequentially connected between the connection point of the parallel resonators P11, P21, and P31 and the ground terminal.
所述TX发射端与发射滤波器501之间连接电感L1，所述TX发射端与接地端之间连接有电感L2。所述接收端RX与接收滤波器502之间连接电感L2，所述接收端RX与接地端之间连接有电感L4。An inductor L1 is connected between the TX transmitting terminal and the transmitting filter 501, and an inductor L2 is connected between the TX transmitting terminal and the ground terminal. An inductor L2 is connected between the receiving terminal RX and the receiving filter 502, and an inductor L4 is connected between the receiving terminal RX and the ground terminal.
图6(a)为压电声波谐振器的电学符号，图6(b)为其等效电学模型图，在不考虑损耗项的情况下，电学模型简化为Lm、Cm和C0组成的谐振电路。根据谐振条件可知，该谐振电路存在两个谐振频点： 一个是谐振电路阻抗值达到最小值时的fs，将fs定义为该谐振器的串联谐振频点；另一个是当谐振电路阻抗值达到最大值时的fp，将fp定义为该谐振器的并联谐振频点；图7示出了谐振器阻抗与频率之间的关系。在某一特定的频率下，有效机电耦合系数越大，则fs和fp的频率差越大，即两个谐振频点离得越远。Figure 6(a) is the electrical symbol of the piezoelectric acoustic wave resonator, and Figure 6(b) is the equivalent electrical model diagram. Without considering the loss term, the electrical model is simplified to a resonant circuit composed of Lm, Cm and C0 . According to the resonance conditions, the resonant circuit has two resonant frequency points: one is fs when the impedance value of the resonant circuit reaches the minimum value, and fs is defined as the series resonance frequency point of the resonator; the other is when the impedance value of the resonant circuit reaches The maximum value of fp is defined as the parallel resonance frequency of the resonator; Fig. 7 shows the relationship between the impedance of the resonator and the frequency. At a certain frequency, the greater the effective electromechanical coupling coefficient, the greater the frequency difference between fs and fp, that is, the farther away the two resonance frequency points are.
图8所示为实施例一中不加调谐单元电路时，在1GHz-2GHz范围内TX滤波器从天线端A1看进去的阻抗特性，此时m9对应频点处的阻抗相对较小；图9为加入调谐单元电路后，TX滤波器从天线端A1看进去的阻抗特性，此时m9对应频点处的阻抗为一极大值，故加入调谐单元电路后TX滤波器低频端m9对应频点处会产生一个零点，从而使得此处频段带外抑制水平的得到明显改善，产生的零点位置可通过调谐单元电路中的参数进行较宽范围的调节，零点调谐范围在0.45f0≤f≤0.8f 0，其中f 0为RX滤波器对应中心频率，f为产生零点所在频点。 Figure 8 shows the impedance characteristics of the TX filter seen from the antenna end A1 in the range of 1GHz-2GHz when the tuning unit circuit is not added in the first embodiment. At this time, the impedance at the corresponding frequency point of m9 is relatively small; Figure 9 In order to add the tuning unit circuit, the TX filter sees the impedance characteristics from the antenna terminal A1. At this time, the impedance at the corresponding frequency point of m9 is a maximum value, so after adding the tuning unit circuit, the low-frequency end m9 of the TX filter corresponds to the frequency point A zero point will be generated at the frequency band, so that the out-of-band suppression level of the frequency band here is significantly improved. The position of the generated zero point can be adjusted in a wide range through the parameters of the tuning unit circuit. The zero point tuning range is 0.45f0≤f≤0.8f 0 , where f 0 is the corresponding center frequency of the RX filter, and f is the frequency point where the zero point is generated.
图10所示为图1所示现有的双工器100和图2所示本申请实施例一涉及的双工器200的发射滤波器201插入损耗幅度-频率响应曲线图，其中虚线是本申请对现有的双工器100的发射滤波器101的插入损耗曲线，实线是本申请实施例一的双工器200的发射滤波器201的插入损耗曲线，本申请实施例一的双工器200的发射滤波器201插入损耗曲线在1.5GHz左右会产生一个零点，从而能在很大程度上改善此频段处的抑制水平。10 is a graph showing the insertion loss amplitude-frequency response curve of the transmission filter 201 of the existing duplexer 100 shown in FIG. 1 and the duplexer 200 related to Embodiment 1 of the present application shown in FIG. The application is for the insertion loss curve of the transmitting filter 101 of the existing duplexer 100. The solid line is the insertion loss curve of the transmitting filter 201 of the duplexer 200 in the first embodiment of the application. The insertion loss curve of the transmitting filter 201 of the transmitter 200 produces a zero point at about 1.5 GHz, which can greatly improve the suppression level at this frequency band.
图11所示为本申请实施例一的双工器200中调谐单元电路203中不同传输线TL电长度对应的发射滤波器插入损耗幅度-频率响应曲线图，即可通过调节调谐单元电路203中传输线电长度实现发射滤波器一定频段内的带外抑制度的改善。11 is a graph showing the insertion loss amplitude-frequency response curve of the transmission filter corresponding to different transmission line TL electrical lengths in the tuning unit circuit 203 of the duplexer 200 in the first embodiment of the application, which can be achieved by adjusting the transmission line in the tuning unit circuit 203 The electrical length realizes the improvement of the out-of-band rejection within a certain frequency band of the transmitting filter.
图12所示为本申请实施例一的双工器200中调谐单元电路203中不同传输线TL特征阻抗对应的发射滤波器插入损耗幅度-频率响应曲线图，即可通过调节调谐单元电路203中传输线特征阻抗实现发射滤波器一定频段内的带外抑制度的改善。12 is a graph showing the insertion loss amplitude-frequency response curve of the transmission filter corresponding to the characteristic impedance of different transmission lines TL in the tuning unit circuit 203 of the duplexer 200 in the first embodiment of the application, which can be achieved by adjusting the transmission line in the tuning unit circuit 203 The characteristic impedance realizes the improvement of out-of-band rejection in a certain frequency band of the transmitting filter.
图13所示为本申请实施例一的双工器200中调谐单元电路203中不同谐振器T10面积对应的发射滤波器插入损耗幅度-频率响应曲线图， 即可通过调节调谐单元电路203中谐振器T10的面积实现发射滤波器一定频段内的带外抑制度的改善。FIG. 13 is a graph showing the insertion loss amplitude-frequency response curve of the transmission filter corresponding to the different resonator T10 areas in the tuning unit circuit 203 of the duplexer 200 in the first embodiment of the application, which can be adjusted by adjusting the resonance in the tuning unit circuit 203 The area of the transmitter T10 realizes the improvement of the out-of-band rejection within a certain frequency band of the transmitting filter.
图14所示为本申请实施例一的双工器200中调谐单元电路203中不同电容器C0容值对应的发射滤波器插入损耗幅度-频率响应曲线图，即可通过调节调谐单元电路203中电容器C0的容值实现发射滤波器一定频段内的带外抑制度的改善。14 is a graph showing the insertion loss amplitude-frequency response curve of the transmission filter corresponding to different capacitor C0 capacitance values in the tuning unit circuit 203 of the duplexer 200 in the first embodiment of the application, which can be achieved by adjusting the capacitor in the tuning unit circuit 203 The capacitance value of C0 realizes the improvement of out-of-band rejection in a certain frequency band of the transmitting filter.
图15所示为本申请实施例一的双工器200中调谐单元电路203中不同电感器L0电感量对应的发射滤波器插入损耗幅度-频率响应曲线图，即可通过调节调谐单元电路203中电感器L0的电感量实现发射滤波器一定频段内的带外抑制度的改善。15 is a graph showing the insertion loss amplitude-frequency response curve of the transmission filter corresponding to the inductance of different inductors L0 in the tuning unit circuit 203 of the duplexer 200 in the first embodiment of the application, which can be adjusted by adjusting the tuning unit circuit 203 The inductance of the inductor L0 realizes the improvement of the out-of-band suppression in a certain frequency band of the transmitting filter.
在上述实施例中，实施例一、实施例二、实施例三以及实施例四涉及的双工器中的所述谐振器T10为具有空气隙的体声波压电谐振器、具有布拉格阻抗反射层的固态装配体声波压电谐振器或LWR谐振器。In the above-mentioned embodiments, the resonator T10 in the duplexer involved in the first, second, third, and fourth embodiments is a bulk acoustic wave piezoelectric resonator with an air gap and a reflective layer with Bragg impedance. The solid-state assembly acoustic wave piezoelectric resonator or LWR resonator.
图16示出了薄膜体声波谐振器结构600的切面示意图，611是半导体衬底材料，601是通过刻蚀得到的空气腔，薄膜体声波谐振器的底电极631淀积于半导体衬底611之上，621为压电薄膜材料，641为顶电极，651、652和653分别为薄膜体声波谐振器的第一层质量负载、第二层质量负载和第三层质量负载。虚线框选区域为601空气腔、631上电极、641下电极、质量负载和621压电层的重叠区域，此区域为有效谐振区。16 shows a schematic cross-sectional view of the thin film bulk acoustic resonator structure 600, 611 is a semiconductor substrate material, 601 is an air cavity obtained by etching, and the bottom electrode 631 of the thin film bulk acoustic resonator is deposited on the semiconductor substrate 611 Above, 621 is a piezoelectric film material, 641 is a top electrode, and 651, 652, and 653 are the first layer mass load, the second layer mass load, and the third layer mass load of the film bulk acoustic wave resonator, respectively. The area selected by the dashed line is the overlapping area of the 601 air cavity, the upper electrode of 631, the lower electrode of 641, the mass load, and the piezoelectric layer of 621. This area is the effective resonance area.
图17示出了固态装配体声波压电谐振器结构700的切面示意图，应用具有高声阻抗材料771、772、773、774和低声阻抗材料761、762、763交替堆叠来代替图16中的601空气腔，高声阻抗材料和低声阻抗材料的厚度为四分之一声波波长，高声阻抗材料和低声阻抗材料层叠的数目可以自由选择。751、752和753分别为固态装配体声波压电谐振器的第一层质量负载、第二层质量负载和第三层质量负载。FIG. 17 shows a schematic cross-sectional view of a solid-state assembly acoustic wave piezoelectric resonator structure 700, using alternately stacked materials with high acoustic impedance 771, 772, 773, 774 and low acoustic impedance materials 761, 762, 763 to replace the one in FIG. 16 In the 601 air cavity, the thickness of the high acoustic impedance material and the low acoustic impedance material is a quarter of the acoustic wave wavelength, and the number of layers of the high acoustic impedance material and the low acoustic impedance material can be freely selected. 751, 752, and 753 are the first layer mass load, the second layer mass load, and the third layer mass load of the solid-state assembly acoustic wave piezoelectric resonator, respectively.
图18示出了LWR谐振器包含衬底1、空腔2、正极3、负极4及压电层介质，所述正负电极通过交叉插指电极连通，所述介质层位于正负电极的插指之间。此图只示出了一层的电极结构，实际上LWR谐振器立体结构为三明治结构。Figure 18 shows that the LWR resonator includes a substrate 1, a cavity 2, a positive electrode 3, a negative electrode 4, and a piezoelectric layer dielectric. The positive and negative electrodes are connected through interdigitated electrodes, and the dielectric layer is located between the positive and negative electrodes. Between the fingers. This figure only shows the electrode structure of one layer. In fact, the three-dimensional structure of the LWR resonator is a sandwich structure.
尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行变化，本发明的范围由所附权利要求及其等同物限定。Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it will be understood that these embodiments can be changed without departing from the principle and spirit of the present invention, and the scope of the present invention is determined by The appended claims and their equivalents are defined.

Claims (10)

  1. 一种双工器，包括：发射滤波器和接收滤波器，所述发射滤波器和接收滤波器连接于天线端子，其特征在于，所述接收滤波器与天线端子之间串联有调谐单元电路；A duplexer, comprising: a transmitting filter and a receiving filter, the transmitting filter and the receiving filter are connected to an antenna terminal, characterized in that a tuning unit circuit is connected in series between the receiving filter and the antenna terminal;
    所述调谐单元电路包括连接在接收滤波器与天线端子之间的串联调谐电路以及连接在串联调谐电路和接收滤波器之间的连接点与接地端之间的并联调谐电路。The tuning unit circuit includes a series tuning circuit connected between the receiving filter and the antenna terminal, and a parallel tuning circuit connected between a connection point between the series tuning circuit and the receiving filter and a ground terminal.
  2. 根据权利要求1所述的双工器，其特征在于，所述并联谐振电路与接地端之间连接有电感。The duplexer of claim 1, wherein an inductor is connected between the parallel resonant circuit and the ground terminal.
  3. 根据权利要求1所述的双工器，其特征在于，所述串联调谐电路包括串联的阻抗变换器和电感器；The duplexer according to claim 1, wherein the series tuning circuit comprises an impedance converter and an inductor connected in series;
    或者，所述串联调谐电路包括阻抗变换器。Alternatively, the series tuning circuit includes an impedance converter.
  4. 根据权利要求3所述的双工器，其特征在于，所述阻抗变换器为传输线或者LC移相器。The duplexer according to claim 3, wherein the impedance converter is a transmission line or an LC phase shifter.
  5. 根据权利要求1所述的双工器，其特征在于，所述并联调谐电路包括并联的谐振器和电容器；The duplexer according to claim 1, wherein the parallel tuning circuit comprises a resonator and a capacitor connected in parallel;
    或者，所述并联调谐电路包括串联的谐振器和电容器；Alternatively, the parallel tuning circuit includes a resonator and a capacitor connected in series;
    或者，所述并联调谐电路包括谐振器。Alternatively, the parallel tuning circuit includes a resonator.
  6. 根据权利要求5所述的双工器，其特征在于，所述谐振器为体声波压电谐振器、固态装配体声波压电谐振器或LWR谐振器。The duplexer of claim 5, wherein the resonator is a bulk acoustic wave piezoelectric resonator, a solid-state assembly bulk acoustic wave piezoelectric resonator, or an LWR resonator.
  7. 一种双工器，包括：发射滤波器和接收滤波器，所述发射滤波器和接收滤波器连接于天线端子，其特征在于，所述接收滤波器与天线端子之间串联有调谐单元电路；A duplexer, comprising: a transmitting filter and a receiving filter, the transmitting filter and the receiving filter are connected to an antenna terminal, characterized in that a tuning unit circuit is connected in series between the receiving filter and the antenna terminal;
    所述调谐单元电路包括串联调谐电路和并联调谐电路，所述串联调谐电路包括至少两个串联在接收滤波器与天线端子之间的阻抗变换器；所述并联调谐电路连接在两个串联的阻抗变换器的连接点与接地端之间，所述并联谐振电路与接地端之间连接有电感。The tuning unit circuit includes a series tuning circuit and a parallel tuning circuit. The series tuning circuit includes at least two impedance converters connected in series between the receiving filter and the antenna terminal; the parallel tuning circuit is connected to two series impedances. Between the connection point of the converter and the ground terminal, an inductance is connected between the parallel resonant circuit and the ground terminal.
  8. 根据权利要求1所述的双工器，其特征在于，所述阻抗变换器为传输线或者LC移相器。The duplexer according to claim 1, wherein the impedance converter is a transmission line or an LC phase shifter.
  9. 根据权利要求1所述的双工器，其特征在于，所述并联调谐电路包括并联的谐振器和电容器；The duplexer according to claim 1, wherein the parallel tuning circuit comprises a resonator and a capacitor connected in parallel;
    或者，所述并联调谐电路包括串联的谐振器和电容器；Alternatively, the parallel tuning circuit includes a resonator and a capacitor connected in series;
    或者，所述并联调谐电路包括谐振器；Alternatively, the parallel tuning circuit includes a resonator;
    进一步的，所述谐振器为体声波压电谐振器、固态装配体声波压电谐振器或LWR谐振器。Further, the resonator is a bulk acoustic wave piezoelectric resonator, a solid-state assembly acoustic wave piezoelectric resonator, or an LWR resonator.
  10. 一种电子设备，其特征在于，包括权利要求1-9中任一项所述的双工器。An electronic device, characterized by comprising the duplexer according to any one of claims 1-9.
PCT/CN2020/111349 2019-11-06 2020-08-26 Duplexer and electronic device WO2021088477A1 (en)

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