CN205377812U - Duplexer - Google Patents
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- CN205377812U CN205377812U CN201490000653.3U CN201490000653U CN205377812U CN 205377812 U CN205377812 U CN 205377812U CN 201490000653 U CN201490000653 U CN 201490000653U CN 205377812 U CN205377812 U CN 205377812U
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- 238000011144 upstream manufacturing Methods 0.000 claims description 13
- 238000004891 communication Methods 0.000 abstract description 20
- 230000035945 sensitivity Effects 0.000 abstract description 11
- 230000008878 coupling Effects 0.000 description 28
- 238000010168 coupling process Methods 0.000 description 28
- 238000005859 coupling reaction Methods 0.000 description 28
- 230000008859 change Effects 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000411 inducer Substances 0.000 description 6
- 238000004220 aggregation Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 230000002776 aggregation Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
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- 230000008054 signal transmission Effects 0.000 description 1
- 230000003238 somatosensory effect Effects 0.000 description 1
Classifications
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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
- H03H9/72—Networks using surface acoustic waves
- H03H9/725—Duplexers
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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
- H03H9/0023—Balance-unbalance or balance-balance networks
- H03H9/0028—Balance-unbalance or balance-balance networks using surface acoustic wave devices
- H03H9/0047—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks
- H03H9/0052—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically cascaded
- H03H9/0057—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically cascaded the balanced terminals being on the same side of the tracks
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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
- H03H9/0023—Balance-unbalance or balance-balance networks
- H03H9/0028—Balance-unbalance or balance-balance networks using surface acoustic wave devices
- H03H9/0085—Balance-unbalance or balance-balance networks using surface acoustic wave devices having four acoustic tracks
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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
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14544—Transducers of particular shape or position
- H03H9/1457—Transducers having different finger widths
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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
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14544—Transducers of particular shape or position
- H03H9/14588—Horizontally-split transducers
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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
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
- H03H9/6436—Coupled resonator filters having one acoustic track only
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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
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
- H03H9/644—Coupled resonator filters having two acoustic tracks
- H03H9/6456—Coupled resonator filters having two acoustic tracks being electrically coupled
- H03H9/6469—Coupled resonator filters having two acoustic tracks being electrically coupled via two connecting electrodes
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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
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
- H03H9/6483—Ladder SAW filters
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Transceivers (AREA)
Abstract
A duplexer that can reduce the influence that brings for the reception sensitivity of receiving the different communication circuit of frequency band in the communication of using a plurality of frequency bands is provided. Duplexer (3) possess transmitting filter portion (11) and receiving filter portion (12). Receiving filter portion (12) connects at antenna end (15) and receives between terminal (14). Receiving filter portion (12) contains the IDT electrode that indicates including a plurality of electrodes. The duty cycle of decision IDT electrode, the peak value frequency that makes 3 times of ripples responses of receiving filter portion (12) from the 3 times of frequency bands biass that correspond pass through the frequency of frequency band (the frequency band of sending a signal) with transmitting filter portion (11).
Description
Technical field
This utility model relates to duplexer (wave splitter device).In more detail, this utility model relates to being used in the duplexer utilizing multiple frequency to bring in the wireless communication terminal of communication data.
Background technology
As the communication standard of portable phone, adopt LTE (Long-Term-Evolution, Long Term Evolution).As by the LTE standard extended, it is proposed to LTE-Advanced.
In LTE-Advanced, discuss the utilization to carrier aggregation (Carrier-Aggregation:CA).In carrier aggregation, by multiple uplink modulation being sent signal binding, it is thus possible to send high speed and substantial amounts of data simultaneously.Same in carrier aggregation, can receive by multiple Corticofugal Modulation of Somatosensories are received signal binding at a high speed and substantial amounts of data simultaneously.
JP 2011-119981 publication (patent documentation 1), discloses the wireless communication terminal with the composition for carrying out carrier aggregation.This wireless communication terminal has wireless transmission part and wireless receiving section.Wireless transmission part has: 2 paths；Uplink modulation is sent signal and passes out to the duplexer of any one of 2 paths corresponding to its frequency component；It is arranged on the transmitting filter of each paths of 2 paths；And adder calculator.The signal provided from each path is added by adder calculator.2 signals being added by adder calculator are sent from antenna simultaneously.On the other hand, wireless receiving section has receiving filter.Receiving filter makes to belong to the downlink modulated received signal after the frequency modulation(PFM) of the 1st downstream bands and the 2nd downstream bands to be passed through.
Look-ahead technique document
Patent documentation
Patent documentation 1:JP JP 2011-119981 publication
The summary of utility model
The problem that utility model to solve
In the above-mentioned wireless communication terminal realizing CA, the antenna terminal of 2 duplexers is common.This wireless communication terminal transmission frequency simultaneously is with different multiple signals, and receives multiple signals that frequency band is different simultaneously.When the frequency of the distorted wave that the transtation mission circuit of the telecommunication circuit from a side produces is positioned at the reception frequency band receiving circuit of the opposing party's telecommunication circuit, the receiving sensitivity of this reception circuit is occurred to deteriorate such problem.
It addition, such problem can be included in the occurring when receiving in frequency band of duplexer of the opposing party in the frequency of 3 times of ripples produced from a side of 2 duplexers.Therefore, above-mentioned problem is not limited to only occur in CA.
Utility model content
The purpose of this utility model is in that, it is provided that can reduce the duplexer of the impact brought to the receiving sensitivity receiving the different telecommunication circuit of frequency band in the communication using multiple frequency bands.
For solving the means of problem
Duplexer involved by certain situation of the present utility model possesses: antenna terminal, transmission terminal, receiving terminal, transmitting filter portion and receiving filter portion.Transmitting filter portion is configured to and is connected between antenna terminal with transmission terminal, makes the signal with the frequency belonging to the 1st frequency band pass through from sending terminal to antenna terminal.Receiving filter portion is configured to and is connected between antenna terminal with receiving terminal, makes the signal with the frequency belonging to the 2nd frequency band pass through from antenna terminal to receiving terminal.Receiving filter portion comprises and includes the IDT electrode that multiple electrode refers to.Determine the dutycycle of IDT electrode, make the crest frequency of 3 times of wave responses in receiving filter portion deviate from the 3rd frequency band 3 times corresponding with the frequency of the 1st frequency band.
Preferably, determine dutycycle, make the crest frequency of 3 times of wave responses exceed because of the shift amount of the crest frequency caused by temperature than the frequency of the upper limit of the 3rd frequency band.
Preferably, the 1st frequency band is corresponding with the upstream band in the frequency range 17 of LTE (LongTermEvolution, Long Term Evolution).2nd frequency band is corresponding with the downstream bands in the frequency range 17 of LTE.3rd frequency band is corresponding with the downstream bands in the frequency range 4 of LTE.Dutycycle is less than 0.68.
The effect of utility model
According to this utility model, the impact brought to the receiving sensitivity receiving the different telecommunication circuit of frequency band can be reduced in the communication using multiple frequency bands.
Accompanying drawing explanation
Fig. 1 indicates that the block diagram of 1 configuration example of the wireless communication terminal that can use the duplexer involved by embodiment of the present utility model.
Fig. 2 indicates that the figure of the composition of the duplexer 3 shown in Fig. 1.
Fig. 3 indicates that the figure of the composition of the duplexer 4 shown in Fig. 1.
Fig. 4 is an illustration for the diagrammatic top view of the IDT electrode of the dutycycle in the receiving filter portion 12 shown in Fig. 2.
Fig. 5 indicates that in the duplexer 3 (embodiment) shown in Fig. 2, the figure of the result of the intensity of 3 times of distortions that mensuration is transmitted to antenna terminal.
Fig. 6 is an illustration for another figure of the improvement of the 3 times of distortions reached by present embodiment.
Fig. 7 indicates that the figure of the return loss at antenna terminal.
The figure of the change of 3 times of wave responses in receiving filter portion when Fig. 8 indicates that the change in duty cycle in the receiving filter portion 12 making the duplexer 3 shown in Fig. 2.
The figure of the change of 3 times of wave responses in the receiving filter portion 12 when Fig. 9 indicates that the change in duty cycle in the transmitting filter portion 11 making the duplexer 3 shown in Fig. 2.
Figure 10 is the chart of the relation between the frequency of the peak value of 3 times of wave responses that the dutycycle in the receiving filter portion shown in Fig. 2 and this receiving filter portion are described.
Figure 11 indicates that the figure of the 1st variation in the receiving filter portion 12 of the duplexer 3 shown in Fig. 2.
Figure 12 indicates that the figure of the 2nd variation in the receiving filter portion 12 of the duplexer 3 shown in Fig. 2.
Detailed description of the invention
Embodiment of the present utility model is described in detail below with reference to accompanying drawing.It addition, same in figure or considerable part are marked same label its explanation no longer repeatedly.
Fig. 1 indicates that the block diagram of 1 configuration example of the wireless communication terminal that can use the duplexer involved by embodiment of the present utility model.With reference to Fig. 1, wireless communication terminal 100 is the transceiver simultaneously carrying out the transmission of signal and the reception of signal, for instance be portable phone.Wireless communication terminal 100 possesses: antenna 1, adder calculator 2, duplexer 3,4, power amplifier 5,6 and modulation-demodulation circuit 7.
Antenna 1 is the antenna having transmission antenna and reception antenna concurrently.Duplexer 3,4 is each in order to use transmission path and RX path electrical separation.Duplexer 3,4 each has the composition connecting 2 wave filter with different frequency bands with 1 common terminal (antenna terminal).2 wave filter can be made up of acoustic surface wave filter.
Duplexer 3 has: transmitting filter portion, and its 1st uplink modulated signals (transmission signal) making to belong to the frequency modulation(PFM) of the 1st upstream band (transmission frequency band) is passed through；With receiving filter portion, its 1st downlink modulated signal (reception signal) making to belong to the frequency modulation(PFM) of the 1st downstream bands (reception frequency band) passes through.
Duplexer 4 has: transmitting filter portion, and its 2nd uplink modulated signals (transmission signal) making to belong to the frequency modulation(PFM) of the 2nd upstream band (transmission frequency band) is passed through；With receiving filter portion, its 2nd downlink modulated signal (reception signal) making to belong to the frequency modulation(PFM) of the 2nd downstream bands (reception frequency band) passes through.
Modulation-demodulation circuit 7 comprises: the 1st modulation circuit the 71, the 1st demodulator circuit the 72, the 2nd modulation circuit the 73 and the 2nd demodulator circuit 74.1st modulation circuit 71 generates the 1st above-mentioned uplink modulated signals.1st demodulator circuit 72 demodulates the 1st above-mentioned downlink modulated signal.2nd modulation circuit 73 generates the 2nd above-mentioned uplink modulated signals.2nd demodulator circuit 74 demodulates the 2nd above-mentioned downlink modulated signal.
In the 1st uplink modulated signals that the 1st modulation circuit 71 generates, by duplexer 3 after being amplified by power amplifier 5.In the 2nd uplink modulated signals that the 2nd modulation circuit 73 generates, by duplexer 4 after being amplified by power amplifier 6.Adder calculator 2 is by the 1st and the 2nd uplink modulated signals coupling respectively through duplexer 3,4.2 uplink modulated signals of coupling are transmitted from antenna 1 simultaneously.
It addition, receive the 1st downlink modulated signal and the 2nd downlink modulated signal by antenna 1 simultaneously.1st downlink modulated signal is by duplexer 3 and is demodulated by the 1st demodulator circuit 72.2nd downlink modulated signal is by duplexer 4 and is demodulated by the 2nd demodulator circuit 74.
1st upstream band, the 1st downstream bands, the 2nd upstream band and the 2nd downstream bands, determine according to the purposes of wireless communication terminal 100.In 1 embodiment, wireless communication terminal 100 is in compliance with the portable phone of LTE-Advanced.
LTE-Advanced adopts CA.Such as in the U.S., investigation utilizes frequency range 4 and the CA of these 2 frequency ranges of frequency range 17.In the frequency range 4 of LTE, upstream band is 1710MHz～1755MHz, and downstream bands is 2110MHz～2155MHz.In frequency range 17, upstream band is 704MHz～716MHz, and downstream bands is 734MHz～746MHz.
When sending distorted signals because of power amplifier or transmitting filter etc., generation has the signal (hereinafter referred to as " 3 times of distortions " or " 3 times of ripples ") of the frequency of 3 times of this transmission signal.The transmission signal being located at frequency range 17 produces 3 times of distortions.The scope of the frequency of these 3 times of distortions becomes 2112 (=704 × 3) MHz～2148 (=716 × 3) MHz.That is, the scope of the frequency of the 3 times of distortions sending signal of frequency range 17 is included in the reception frequency band (2110MHz～2155MHz) of frequency range 4.
Therefore, if producing 3 times of distortions in the transmission signal of frequency range 17, then after these 3 times of distortions (3 times of ripples) are transferred to antenna terminal, the reception circuit (demodulator circuit) of frequency range 4 can be arrived by the receiving filter of the duplexer corresponding with frequency range 4.The receiving sensitivity receiving circuit thus producing frequency range 4 reduces such problem.
Therefore, in the present embodiment, the duplexer corresponding with frequency range 17, the 3 times of ripples being configured to make arrival antenna terminal are little as far as possible.It addition, in the embodiment being described below, duplexer 3 is corresponding with the frequency range 17 of LTE, duplexer 4 is corresponding with the frequency range 4 of LTE.
Fig. 2 indicates that the figure of the composition of the duplexer 3 shown in Fig. 1.With reference to Fig. 2, duplexer 3 has: transmitting filter portion 11, receiving filter portion 12, transmission terminal 13, receiving terminal 14 and the antenna terminal 15 being connected with antenna 1 (with reference to Fig. 1).It is connected transmitting filter portion 11 with sending between terminal 13 at antenna terminal 15.Receiving filter portion 12 it is connected between antenna terminal 15 with receiving terminal 14.
Transmitting filter portion 11 is ladder type acoustic surface wave filter.Transmitting filter portion 11 has series arm resonator S1, S2, S3, S4 and parallel arm resonator P1, P2, P3.Series arm resonator S1, S2, S3, S4 and parallel arm resonator P1, P2, P3 each have elastic surface wave resonator.As the 1 port type elastic surface wave resonator that elastic surface wave resonator uses, have and form 1 IDT (InterdigitalTrasducer) electrode on piezoelectric substrate 10 and on the direction of propagation of elastic surface wave, be located at 2 reflectors of both sides of IDT.
Parallel arm resonator P1, P2 are connected with earthing potential via inducer L2.Parallel arm resonator P3 is connected with earthing potential via inducer L3.It addition, the circuit in transmitting filter portion 11 is constituted and the composition of each resonator in composition transmitting filter portion 11 does not limit as shown in Figure 2.
Receiving filter portion 12 comprises: the vertical coupling resonator type acoustic surface wave filter 17,18 of 1 port type elastic surface wave resonator 16 and 3IDT type.Vertical coupling resonator type acoustic surface wave filter 17,18 cascade is connected.Between antenna terminal 15 and vertical coupling resonator type acoustic surface wave filter 17, connect 1 port type elastic surface wave resonator 16.Additionally, vertical coupling resonator type acoustic surface wave filter can also replace 3IDT type, is the vertical coupling resonator type acoustic surface wave filter of the 5IDT type etc. being arranged side-by-side 5 IDT electrode on piezoelectric substrate on the direction of propagation of elastic surface wave, being provided with 2 reflectors on the piezoelectric substrate of the both sides of these 5 IDT side by side.
1 port type elastic surface wave resonator 16 has: IDT electrode 16a and a pair reflector 16b, 16c.Reflector 16b, 16c are arranged in the both sides of IDT electrode 16a on the direction of propagation of the elastic surface wave of IDT electrode 16a.
Vertical coupling resonator type acoustic surface wave filter 17, has: IDT electrode 17a～17c and reflector 17d, 17e.IDT electrode 17a～17c configures along elastic surface direction of wave travel.The configuration of elastic surface direction of wave travel both sides reflector 17d, 17e in the region being provided with IDT electrode 17a～17c.
Vertical coupling resonator type acoustic surface wave filter 18 has: IDT electrode 18a～18c and reflector 18d, 18e.IDT electrode 18a～18c configures along elastic surface direction of wave travel.The configuration of elastic surface direction of wave travel both sides reflector 18d, 18e in the region being provided with IDT electrode 18a～18c.
One end of IDT electrode 17a is connected with one end of IDT electrode 18a.The other end of IDT electrode 17a and the other end of IDT electrode 18a are connected with earthing potential.
One end of IDT electrode 17b is connected with antenna terminal 15 via IDT electrode 16a.The other end of IDT electrode 17b is connected with earthing potential.
One end of IDT electrode 17c is connected with one end of IDT electrode 18c.The other end of IDT electrode 17c and the other end of IDT electrode 18c are connected with earthing potential.
One end of IDT electrode 18b is connected with receiving terminal 14.The other end of IDT electrode 18b is connected with earthing potential.
Fig. 3 indicates that the figure of the composition of the duplexer 4 shown in Fig. 1.With reference to Fig. 3, duplexer 4 has: transmitting filter portion 21, receiving filter portion 22, transmission terminal 23, receiving terminal 24 and the antenna terminal 25 being connected with antenna 1 (with reference to Fig. 1).It is connected transmitting filter portion 21 with sending between terminal 23 at antenna terminal 25.It addition, be connected receiving filter portion 22 between antenna terminal 25 with receiving terminal 24.
Transmitting filter portion 21 is ladder type acoustic surface wave filter.Transmitting filter portion 21 has: series arm resonator S11, S12, S13, S14 and parallel arm resonator P11, P12, P13, P14.Identical with transmitting filter portion 11, series arm resonator S11, S12, S13, S14 and parallel arm resonator P11, P12, P13, P14 each have elastic surface wave resonator.Elastic surface wave resonator has 1 IDT electrode and 2 reflectors that are formed on piezoelectric substrate 20.
Parallel arm resonator P1, P2, P3 are connected in parallel, and are connected with earthing potential via inducer L11.Parallel arm resonator P14 is connected with earthing potential via inducer L13.Inducer L12 and series arm resonator S14 is connected in parallel.
Receiving filter portion 22 has filter section 26,27,28,29.Filter section 26 has the composition being connected in series by 31 port type elastic surface wave resonators.One square end of filter section 26 is connected with antenna terminal 25.
Filter section 27,28 is individually the vertical coupling resonator type acoustic surface wave filter of 3IDT type.A respective square end of filter section 27,28 is commonly connected with another square end of filter section 26.Another square end respective of filter section 27,28 is commonly connected with receiving terminal 24.
Filter section 29 has the composition being connected in series by 21 port type elastic surface wave resonators.One square end of filter section 29 is connected with receiving terminal 25.Another square end of filter section 29 is connected with earthing potential.
It addition, constitute the composition of 1 port type elastic surface wave resonator of filter section 26,29, it is also possible to same with the composition of 1 port type elastic surface wave resonator shown in Fig. 2.It addition, the composition constituting the vertical coupling resonator type acoustic surface wave filter of the 3IDT type of filter section 27,28 can also be same with the composition of the vertical coupling resonator type acoustic surface wave filter 17 or 18 of the 3IDT type shown in Fig. 2.
The transmitting filter portion 11 of duplexer 3 by frequency band (the 1st frequency band), corresponding with the upstream band of frequency range 17.The receiving filter portion 12 of duplexer 3 corresponding with the downstream bands of frequency range 17 by frequency band (the 2nd frequency band).In duplexer 3, determine the dutycycle of the IDT electrode in receiving filter portion 12, so that the crest frequency of the 3 of receiving filter portion 12 times of wave responses deviates from the 3 of the frequency of the frequency band in transmitting filter portion 11 times of corresponding frequency bands (the 3rd frequency band).In receiving filter portion 12, the vertical coupling resonator type acoustic surface wave filter 17,18 of 1 port type elastic surface wave resonator 16 and 3IDT type has identical dutycycle.In 1 embodiment, in order to suppress to receive the receiving sensitivity deterioration of circuit, dutycycle is determined as the suitable value (wherein, more than 0) of less than 0.68.
Alternatively, it is also possible to make duplexer 3 corresponding with the frequency range 4 of LTE, make duplexer 4 corresponding with the frequency range 17 of LTE.In this case, duplexer 4 has the composition shown in Fig. 2, and duplexer 3 has the composition shown in Fig. 3.
Fig. 4 is an illustration for the diagrammatic top view of the IDT electrode of the dutycycle in the receiving filter portion 12 shown in Fig. 2.With reference to the width that the electrode that Fig. 4, width W1 are IDT electrode refers to.Width W2 is the distance between 2 electrodes refer to.The dutycycle in receiving filter portion 12 is defined by below formula.When asking for dutycycle, the design load of IDT electrode is used to calculate.
W1÷(W1+W2)
It addition, the term of " dutycycle " can also be replaced and uses the term of " metallization than ".
Following description adjusts the effect that the dutycycle in the receiving filter portion 12 of duplexer 3 is brought.Fig. 5 indicates that in the duplexer 3 (embodiment) shown in Fig. 2, the figure of the result of the intensity of 3 times of distortions that mensuration is transmitted to antenna terminal.
With reference to Fig. 5, embodiment and comparative example are illustrated the result of the intensity measuring the 3 times of distortions (3 times of ripples) to antenna terminal transmission.In a comparative example, the duplexer of existing frequency range 17 is used.The dutycycle in receiving filter portion is being set as on 0.71 this aspect by this comparative example, and the duplexer 3 involved by present embodiment is different.Namely in a comparative example, the dutycycle dutycycle more than embodiment is made.In existing design, in vertical coupling filter, dutycycle is set to relatively big, to reduce the insertion loss of vertical coupling filter as much as possible.In the method for designing of so existing dutycycle, although insertion loss can be reduced, if but send simultaneously, receive multiple signals that frequency band is different, then the receiving sensitivity sometimes receiving circuit can deteriorate.From the view point of the reduction insertion loss of existing design, dutycycle is designed to big as far as possible by comparative example.
The intensity of the signal of the frequency of 3 times of the frequency possessing this electric power exported from antenna terminal when chart is shown in the electric power that transmission terminal (Tx end) applies+27dBm.Such as when being 710MHz to the frequency of the signal that Tx end applies, measure the signal of frequency 2120MHz from antenna terminal output.
Measured value is the value being integrated at the frequency band of 5MHz.The transmission frequency band (the 1st frequency band) of the duplexer of frequency range 17 is the signal value that 704～716MHz, Fig. 5 illustrate in the frequency band that the frequency band of 706.5～713.5MHz becomes 3 times.Wherein the transverse axis of chart illustrates in the scope of 706.5～713.5MHz.
The value of the longitudinal axis of chart is less means that the intensity of 3 times of distortions is less.More little then more preferred from the intensity of 3 times of distortions of antenna terminal output.According to Fig. 5, in comparative example (existing duplexer), the worst-case value of 3 times of distortions is-72dBm.On the other hand, in an embodiment, the worst-case value of 3 times of distortions is-87dBm.That is, Fig. 5 illustrates, by present embodiment, the worst-case value of 3 times of distortions improves 15dBm with comparing in the past.
Fig. 6 is an illustration for another figure of the improvement of the 3 times of distortions reached by present embodiment.With reference to Fig. 6, trial-production changes the sample of the duplexer of several condition, and measures the size of 3 times of distortions relative to transmission frequency (being expressed as Tx frequency in figure).Finding out from the contrast of sample 1 and sample 2, the frequency corresponding with the most not good enough (peak value) of 3 times of distortions shifts in the direction of Xiang Genggao.Fig. 6 is shown in the characteristic of duplexer to exist the characteristic of displacement of the crest frequency bringing 3 times of distortions.
Fig. 7 indicates that the figure of the return loss at antenna terminal.With reference to Fig. 7, return loss in antenna terminal is less, reflection signal that is relatively big and that transmit is less.Otherwise, return loss in antenna terminal is bigger, reflect signal that is less and that transmit bigger.
If producing 3 times of wave responses in receiving filter portion under becoming the frequency of 3 times of transmission frequency, then becoming big in this frequency band return loss, signal transmits to antenna terminal.To the signal of antenna terminal transmission, by the receiving filter portion of duplexer 4, reception circuit in frequency range 4 is received.Thus in the telecommunication circuit of frequency range 4, receiving sensitivity reduces.
The frequency that Fig. 7 is the peak value of the return loss can seen in 3 times of wave responses of receiving filter is present in the frequency band that 3 times of distortions with transmitting filter are corresponding.It addition, the frequency that Fig. 7 represents the frequency of the peak value of 3 times of wave responses of receiving filter and the peak of 3 times of distortions is shifting in the same manner.
Therefore, in the present embodiment, make the frequency shift of the peak value of 3 times of wave responses in receiving filter portion 12, make the crest frequency of 3 times of wave responses deviate from the 3 of the frequency of the frequency band belonging to transmitting filter portion 11 times of corresponding frequency bands (the 3rd frequency band).By thus reducing 3 times of distortions that return loss reduces in antenna end.
The figure of the change of 3 times of wave responses in receiving filter portion when Fig. 8 indicates that the change in duty cycle in the receiving filter portion 12 making the duplexer 3 shown in Fig. 2.The figure of the change of 3 times of wave responses in the receiving filter portion 12 when Fig. 9 indicates that the change in duty cycle in the transmitting filter portion 11 making the duplexer 3 shown in Fig. 2.
With reference to Fig. 8 and Fig. 9, when making the change in duty cycle in receiving filter portion 12, the frequency of the peak value of 3 times of wave responses in receiving filter portion (return loss become maximum frequency) changes.Specifically, if making the duty in receiving filter portion relatively larger, then the crest frequency step-down of 3 times of wave responses.On the other hand, if making the duty in receiving filter portion smaller, then the crest frequency of 3 times of wave responses uprises.But, even if making the change in duty cycle in transmitting filter portion 11, the frequency of the peak value of 3 times of wave responses in receiving filter portion 12 is also without substantial variations.
Therefore, in the present embodiment, set the dutycycle of receiving filter, make the dutycycle in receiving filter portion 12 deviate from the 3 of the frequency of the upstream band belonging to frequency range 17 times of corresponding frequency bands.So-called " with the 3 of the frequency belonging to upstream band times of corresponding frequency bands ", is the frequency of 3 times of lower frequency limit from the upstream band scope to the frequency of 3 times of upper limiting frequency of upstream band.More specifically, in the duplexer 3 of frequency range 17, the dutycycle in receiving filter portion 12 is set as less than 0.68.
Figure 10 is the chart of the relation between the frequency of the peak value of 3 times of wave responses that the dutycycle in the receiving filter portion shown in Fig. 2 and this receiving filter portion are described.With reference to Figure 10, the frequency of the upper limit of the transmission frequency band of frequency range 17 is 716MHz.The frequency of 3 times of this frequency becomes 2148MHz.
And then, it is considered to the temperature characterisitic of 3 times of wave responses in receiving filter portion 12.So-called " temperature characterisitic ", is the amplitude of variation of the crest frequency of 3 times of wave responses in given temperature range.Above-mentioned " given temperature range " such as can be set to the guarantee temperature range in receiving filter portion 12.In 1 embodiment, receiving filter portion 12 ensures that temperature range is the scope of-30 DEG C～+85 DEG C.
The amplitude of variation of the crest frequency of 3 times of wave responses in the receiving filter portion 12 in above-mentioned temperature range is set to α.Determine the dutycycle in receiving filter portion 12 so that the crest frequency of 3 times of wave responses of receiving filter improves the shift amount α of the crest frequency that temperature causes from 2148MHz.In 1 embodiment, shift amount α is defined as 5MHz.If following the characteristic shown in Figure 10, the dutycycle in the receiving filter portion 12 that the crest frequency of 3 times of wave responses is corresponding with (2148+5)=2153MHz is decided to be less than 0.68.
The dutycycle in receiving filter portion 12 more reduces, then the crest frequency of 3 times of wave responses in receiving filter portion 12 is more high.The crest frequency of 3 times of wave responses in receiving filter portion 12 more uprises, then more can more reliably make the crest frequency of 3 times of wave responses in receiving filter portion 12 deviate from the frequency band 3 times corresponding with the frequency of the transmission frequency band belonging to frequency range 17.From this viewpoint, for instance preferably the dutycycle of receiving filter is set as less than 0.65.
The duplexer of existing frequency range 17, uses in such as using the communication mode of circuit of not direct-connected antenna terminal.Specifically, the duplexer (duplexer) of frequency range 17, use in the circuit of the frequency of each frequency range at the signal switch that will input from antenna terminal or homodromy (diplexer) partial wave.In such mode, when there are 3 times of distortions in duplexer, these 3 times of distortions are without hindering receiving sensitivity.
On the other hand, in the present embodiment, wireless communication terminal 100 possesses: the duplexer 3 of frequency range 17 and the duplexer 4 of frequency range 4.Owing to the frequency of the 3 times of distortions (3 times of ripples) sending signal of frequency range 17 is included in the reception frequency band of frequency range 4, therefore the receiving sensitivity of the telecommunication circuit of frequency range 4 has the probability of deterioration.But according to present embodiment, duplexer 3 can be passed through and make the intensity with the signal (3 times of distortions) of the frequency received in frequency band being included in frequency range 4 less.Accordingly, it is capable to reduce the impact brought to the receiving sensitivity of the telecommunication circuit of frequency range 4.
It addition, the composition in the receiving filter portion being included in the duplexer (duplexer 3) of frequency range 17 is not limited to the composition shown in Fig. 2.Although the generation of 3 times of wave responses depends on the dutycycle of receiving filter, but is not rely on the composition of receiving filter.Therefore, if the composition shown in Fig. 2, as long as then dutycycle is identical, then differently composed receiving filter portion 12 can also will be had to be used in duplexer 3.The configuration example in the such receiving filter portion 12 of following description.
Figure 11 indicates that the figure of the 1st variation in the receiving filter portion 12 of the duplexer 3 shown in Fig. 2.Same with reference to Fig. 2 and Figure 11, receiving filter portion 12A and receiving filter portion 12, it is all the balanced filter of the vertical coupling resonator type acoustic surface wave filter 17,18 with 2 3IDT types.Wherein, receiving filter portion 12A is different with receiving filter portion 12 on the point of the composition of vertical coupling resonator type acoustic surface wave filter 18.Specifically, receiving terminal 14A, 14B are connected at the IDT electrode 18b of resonator type acoustic surface wave filter 18.
Figure 12 indicates that the figure of the 2nd variation in the receiving filter portion 12 of the duplexer 3 shown in Fig. 2.It is being on this aspect of balanced filter of vertical coupling resonator type acoustic surface wave filter 17-1,17-2,18-1, the 18-2 with 4 3IDT types and receiving filter portion 12 difference with reference to Fig. 2 and Figure 12, receiving filter portion 12B.The composition of the vertical coupling resonator type acoustic surface wave filter 17 shown in each composition of vertical coupling resonator type acoustic surface wave filter 17-1,17-2 and Fig. 2 is same.The composition of the vertical coupling resonator type acoustic surface wave filter 18 shown in each composition of vertical coupling resonator type acoustic surface wave filter 18-1,18-2 and Fig. 2 is same.
Vertical coupling resonator type acoustic surface wave filter 17-1,17-2 each have IDT electrode 17b.One end of IDT electrode 17b is connected with the IDT electrode 16a of 1 port type elastic surface wave resonator 16.
Vertical coupling resonator type acoustic surface wave filter 17-1,18-1 are connected with each other with the connected mode identical with the vertical coupling resonator type acoustic surface wave filter 17,18 shown in Fig. 2.Similarly, vertical coupling resonator type acoustic surface wave filter 17-2,18-2 are connected with each other with the connected mode identical with the vertical coupling resonator type acoustic surface wave filter 17,18 shown in Fig. 2.
Embodiment of disclosure is all illustrate and be not considered as restriction on all points.Scope of the present utility model is not by above-mentioned explanation but illustrated by scope of the claims, it is intended that comprise the whole changes in the meaning equivalent with scope of the claims and scope.
The explanation of label
1 antenna
2 adder calculators
3,4 duplexer
5,6 power amplifier
7 modulation-demodulation circuits
10,20 piezoelectric substrate
11,21 transmitting filter portion
12,12A, 12B, 22 receiving filter portions
13,23 terminal is sent
14,14A, 14B, 24,25 receiving terminal
15,25 antenna terminal
161 port type elastic surface wave resonators
16a, 17a～17c, 18a～18cIDT electrode
17,18 vertical coupling resonator type acoustic surface wave filter
16b, 16c, 17d, 17e, 18d, 18e reflector
26～29 filter section
71 the 1st modulation circuits
72 the 1st demodulator circuits
73 the 2nd modulation circuits
74 the 2nd demodulator circuits
100 wireless communication terminals
L2, L3, L11, L12, L13 inducer
P1～P3, P11～P14 parallel arm resonator
S1～S4, S11～S14 series arm resonator
Claims (3)
1. a duplexer, possesses:
Antenna terminal；
Send terminal；
Receiving terminal；
Transmitting filter portion, it is connected between described antenna terminal and described transmission terminal, and is configured to make the signal with the frequency belonging to the 1st frequency band pass through from described transmission terminal to described antenna terminal；With
Receiving filter portion, it is connected between described antenna terminal and described receiving terminal, and the signal being configured to make to have the frequency belonging to the 2nd frequency band passes through from described antenna terminal to described receiving terminal,
Described receiving filter portion comprises and includes the IDT electrode that multiple electrode refers to,
Determine the dutycycle of described IDT electrode, make the crest frequency of 3 times of wave responses in described receiving filter portion deviate from the 3rd frequency band 3 times corresponding with the frequency of described 1st frequency band.
2. duplexer according to claim 1, wherein,
Determine described dutycycle, make the described crest frequency of described 3 times of wave responses exceed because of the shift amount of the described crest frequency caused by temperature than the frequency of the upper limit of described 3rd frequency band.
3. duplexer according to claim 2, wherein,
Described 1st frequency band is corresponding with the upstream frequency band in the frequency range 17 of LTE,
Described 2nd frequency band is corresponding with the downstream bands in the frequency range 17 of described LTE,
Described 3rd frequency band is corresponding with the downstream bands in the frequency range 4 of described LTE,
Described dutycycle is less than 0.68.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-132498 | 2013-06-25 | ||
| JP2013132498 | 2013-06-25 | ||
| PCT/JP2014/057254 WO2014208145A1 (en) | 2013-06-25 | 2014-03-18 | Splitter device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205377812U true CN205377812U (en) | 2016-07-06 |
Family
ID=52141500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201490000653.3U Expired - Lifetime CN205377812U (en) | 2013-06-25 | 2014-03-18 | Duplexer |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN205377812U (en) |
| WO (1) | WO2014208145A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6658867B2 (en) * | 2016-03-16 | 2020-03-04 | 株式会社村田製作所 | Composite filter device |
| WO2018043496A1 (en) * | 2016-08-30 | 2018-03-08 | 株式会社村田製作所 | Elastic wave device and method for manufacturing same |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004228911A (en) * | 2003-01-22 | 2004-08-12 | Tdk Corp | Branching filter |
| JP2006086871A (en) * | 2004-09-16 | 2006-03-30 | Kyocera Corp | Composite branch circuit, chip part using the same, high-frequency module, and radio communication apparatus |
| WO2006040923A1 (en) * | 2004-10-08 | 2006-04-20 | Murata Manufacturing Co., Ltd. | Splitter |
| JP5101048B2 (en) * | 2006-06-19 | 2012-12-19 | 太陽誘電株式会社 | Duplexer |
| JP5237138B2 (en) * | 2009-01-27 | 2013-07-17 | 太陽誘電株式会社 | Filters, duplexers, communication modules |
| CN103109458B (en) * | 2010-09-10 | 2015-06-10 | 株式会社村田制作所 | Acoustic wave branching filter |
| JP5310873B2 (en) * | 2010-11-09 | 2013-10-09 | 株式会社村田製作所 | Elastic wave filter device |
| EP3944497A3 (en) * | 2010-12-10 | 2022-03-30 | pSemi Corporation | A tunable acoustic wave resonator module and method of tuning an acoustic wave filter |
| JPWO2012090559A1 (en) * | 2010-12-29 | 2014-06-05 | 株式会社村田製作所 | Elastic wave filter device and communication device including the same |
-
2014
- 2014-03-18 CN CN201490000653.3U patent/CN205377812U/en not_active Expired - Lifetime
- 2014-03-18 WO PCT/JP2014/057254 patent/WO2014208145A1/en active Application Filing
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|---|---|
| WO2014208145A1 (en) | 2014-12-31 |
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