CN203119851U - Acoustic wave branching filter - Google Patents

Acoustic wave branching filter Download PDF

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Publication number
CN203119851U
CN203119851U CN201190000442.6U CN201190000442U CN203119851U CN 203119851 U CN203119851 U CN 203119851U CN 201190000442 U CN201190000442 U CN 201190000442U CN 203119851 U CN203119851 U CN 203119851U
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China
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idt
longitudinal coupling
coupling resonator
type acoustic
resonator type
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Chinese (zh)
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高峰裕一
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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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
    • 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
    • H03H9/0033—Balance-unbalance or balance-balance networks using surface acoustic wave devices having one acoustic track only
    • H03H9/0038—Balance-unbalance or balance-balance networks using surface acoustic wave devices having one acoustic track only the balanced terminals being on the same side of the track
    • 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
    • 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
    • H03H9/0066—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically parallel
    • H03H9/0071—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically parallel the balanced terminals being on the same side of the tracks
    • 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
    • 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
    • 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
    • H03H9/6489—Compensation of undesirable effects
    • H03H9/6496—Reducing ripple in transfer characteristic
    • 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

Abstract

Disclosed is an acoustic wave branching filter which is capable of preventing occurrence of a ripple in a passband of a transmitting filter and which can increase abruptness of filter characteristics. The disclosed acoustic wave branching filter is provided with a receiving filter (10) which is connected between an antenna terminal (2) and first and second receiving terminals (3 and 4) and which comprises longitudinally-coupled resonator-type acoustic wave filters, and a transmitting filter (20) which is connected between the antenna terminal (2) and a transmitting terminal (5); wherein the receiving filter (10) possesses first and second longitudinally-coupled resonator-type acoustic wave filter units (101 and 102), wherein in the longitudinally-coupled resonator-type acoustic wave filter units (101 and 102), when the wavelength of an acoustic wave which is determined by the period of electrode fingers of second IDTs (112 and 122), which are IDTs connected to the antenna terminal (2), is assumed to be lambda1, and the wavelength of an acoustic wave which is determined by the period of electrode fingers of first and third IDTs (111, 113, 121, and 123), which are IDTs not connected to the antenna terminal (2), is assumed to be lambda2, lambda1 <lambda2.

Description

Wave demultiplexer
Technical field
The utility model relates to the Wave demultiplexer that has utilized elastic waves such as elastic surface wave, more specifically relates to the Wave demultiplexer that receiving filter is made of the longitudinal coupling resonator type acoustic wave filter.
Background technology
For example, with UMTS (Universal Mobile Telecommunications System: universal mobile telecommunications system) such CDMA (Code Division Multiple Access: code division multiple access) in the corresponding portable telephone of mode, in order to carry out transmission and the reception of signal simultaneously, at RF (Radio Frequency: radio frequency) carried duplexer in the circuit.Duplexer is the channel-splitting filter that possesses transmitting filter, receiving filter and match circuit.As above-mentioned transmitting filter and receiving filter, acoustic surface wave filter is widely adopted.
One example of this duplexer is disclosed in following patent documentation 1.
Figure 13 is the summary pie graph for the duplexer of explanation patent documentation 1 record.
Duplexer 1001 has the antenna terminal 1003 that is connected with antenna 1002.Between antenna terminal 1003 and transmission terminal 1004, be connected with transmitting filter 1005.In addition, between antenna terminal 1003 and first, second reception terminal 1006,1007, be connected with receiving filter 1008.And, between antenna terminal 1003 and receiving filter 1008, be connected with match circuit 1009.
Above-mentioned transmitting filter 1005 and receiving filter 1008 are made of acoustic surface wave filter.In addition, in order to seek miniaturization, receiving filter 1008 has the balanced-unbalanced translation function.That is: in receiving filter 1008, from input terminal 1010 input unbalanced signals, receive terminal 1006,1007 output balanced signals from first, second.In patent documentation 1, adopted the balanced type longitudinal coupling resonator type acoustic surface wave filter with balanced-unbalanced translation function as above-mentioned receiving filter 1008.Thus, can in the RF of portable telephone circuit, omit balanced-to-unbalanced transformer, inter-stage filter.
Technical literature formerly
Patent documentation
Patent documentation 1: TOHKEMY 2003-347964 communique
The utility model content
(problem that utility model will solve)
Yet, known with the longitudinal coupling resonator type acoustic surface wave filter as in the duplexer 1001 of receiving filter 1008, the passband of transmitting filter 1005 produces ripple (ripple) sometimes.This ripple is considered to occur owing to influence as the longitudinal coupling resonator type acoustic surface wave filter of receiving filter 1008.In the used duplexer, especially there is the problem that is easy to occur above-mentioned ripple in the narrow communication system of frequency interval between the passband of the passband of transmitting filter as UMTS-BAND2,3,8 and receiving filter.
The purpose of this utility model is to eliminate above-mentioned the deficiencies in the prior art, and a kind of Wave demultiplexer that is difficult for producing ripple at the passband of transmitting filter is provided.
(being used for solving the means of problem)
The Wave demultiplexer that the utility model relates to possesses antenna terminal, receives terminal and sends terminal, also possesses: receiving filter, and it is connected antenna terminal and receives between the terminal, is made of the longitudinal coupling resonator type acoustic wave filter; And transmitting filter, it is connected antenna terminal and sends between the terminal.In the utility model, the longitudinal coupling resonator type acoustic wave filter has at least 3 IDT along elastic wave propagation direction configuration, and at least 1 IDT among at least 3 IDT is connected with antenna terminal, and all the other IDT are not connected with antenna terminal.And, will with IDT that antenna terminal is connected in the wavelength of elastic wave be made as λ 1, will be not with IDT that antenna terminal is connected in the wavelength of elastic wave when being made as λ 2, satisfy λ 1＜λ 2.
Preferred in the Wave demultiplexer that the utility model relates to, ratio λ 1/ λ 2 of above-mentioned λ 1 and λ 2 is below 0.998.In this case, at the more difficult generation ripple of the passband of transmitting filter.
Other particular aspects of the Wave demultiplexer that relates at the utility model, receive terminal and have first, second reception terminal, the longitudinal coupling resonator type acoustic wave filter has: be connected in parallel in first, second 3IDT type longitudinal coupling resonator type acoustic wave filter portion of antenna terminal; Join the 3rd, the 4th 3IDT type longitudinal coupling resonator type acoustic wave filter portion that is connected with first, second 3IDT type longitudinal coupling resonator type acoustic wave filter ministerial level respectively.Three, the 4th 3IDT type longitudinal coupling resonator type acoustic wave filter portion is connected with first, second reception terminal respectively.And, when 3 IDT with first, second 3IDT type longitudinal coupling resonator type acoustic wave filter portion are made as first～the 3rd IDT respectively along the elastic wave propagation direction, each the 2nd IDT of first, second 3IDT type longitudinal coupling resonator type acoustic wave filter portion is connected with antenna terminal, and each the first, the 3rd IDT is not connected with antenna terminal.
In another particular aspects of the Wave demultiplexer that the utility model relates to, receive terminal and have first, second reception terminal, the longitudinal coupling resonator type acoustic wave filter has first, second 3IDT type longitudinal coupling resonator type acoustic wave filter portion of the antenna terminal of being connected in parallel in.First, second 3IDT type longitudinal coupling resonator type acoustic wave filter portion receives terminal with first, second respectively and is connected.When 3 IDT with first, second 3IDT type longitudinal coupling resonator type acoustic wave filter portion are made as first～the 3rd IDT along the elastic wave propagation direction, each the first, the 3rd IDT of first, second 3IDT type longitudinal coupling resonator type acoustic wave filter portion is connected with antenna terminal, and each the 2nd IDT is not connected with antenna terminal and is connected with first, second reception terminal respectively.
In another particular aspects of the Wave demultiplexer that the utility model relates to, receive terminal and have first, second reception terminal, the longitudinal coupling resonator type acoustic wave filter is the 5IDT type longitudinal coupling resonator type acoustic wave filter that disposes 5 IDT along the elastic wave propagation direction.
In another particular aspects of the Wave demultiplexer that the utility model relates to, when 5 IDT in the 5IDT type longitudinal coupling resonator type acoustic wave filter are made as first～the 5th IDT along the elastic wave propagation direction, the first, the 3rd and the 5th IDT is connected with antenna terminal, the second, the 4th IDT is not connected with antenna terminal, the 2nd IDT and first receives terminal and is connected, and the 4th IDT and second receives terminal and is connected.
In the Wave demultiplexer that the utility model relates to, though can in various frequency bands, be used, especially be fit to use in the frequency band of UMTS-BAND2,3 or 8 standard.In the frequency band of UMTS-BAND2,3 or 8 standard, transmitter side passband and receiver side passband are close, and the utility model is especially effective in this case.
In the utility model, above-mentioned longitudinal coupling resonator type acoustic wave filter both can be the longitudinal coupling resonator type acoustic surface wave filter that has utilized elastic surface wave, also can be the longitudinal coupling resonator type elastic boundary wave filter that has utilized boundary acoustic wave.
(utility model effect)
In the Wave demultiplexer that the utility model relates to, in the longitudinal coupling resonator type acoustic wave filter as receiving filter, since will with IDT that antenna terminal is connected in the wavelength of elastic wave be made as λ 1, will be not with IDT that antenna terminal is connected in the wavelength of elastic wave satisfy λ 1＜λ 2 when being made as λ 2, thereby at the difficult generation of the passband ripple of transmitting filter.Therefore, can improve the characteristic of passing through of transmitting filter.
Description of drawings
Fig. 1 is the schematic circuit as the duplexer of Wave demultiplexer that first execution mode of the present utility model relates to.
Fig. 2 is the figure of the filter characteristic of the transmitting filter in the duplexer of the filter characteristic of transmitting filter in the duplexer of expression first execution mode of the present utility model and first comparative example.
Fig. 3 is the figure of the filter characteristic of the transmitting filter in the duplexer of the filter characteristic of transmitting filter in the duplexer of expression first execution mode of the present utility model and second comparative example.
Fig. 4 is the figure that the major part of the filter characteristic of Fig. 3 is amplified laggard line display.
Fig. 5 is the figure of the filter characteristic of the transmitting filter in the duplexer of the filter characteristic of transmitting filter in the duplexer of expression first execution mode of the present utility model and first variation.
Fig. 6 is the figure of the filter characteristic of the transmitting filter in the duplexer of the filter characteristic of transmitting filter in the duplexer of expression first execution mode of the present utility model and second variation.
Fig. 7 is the figure of the filter characteristic of the transmitting filter in the duplexer of the filter characteristic of transmitting filter in the duplexer of expression first execution mode of the present utility model and the 3rd variation.
Fig. 8 is the figure that concerns between the abruptness in the filter characteristic of expression λ 1/ λ 2 and transmitting filter in the receiving filter of the duplexer of first execution mode of the present utility model.
Fig. 9 is the schematic circuit as the duplexer of Wave demultiplexer that second execution mode of the present utility model relates to.
Figure 10 is the schematic circuit as the duplexer of Wave demultiplexer that the 3rd execution mode of the present utility model relates to.
Figure 11 is the schematic circuit as the duplexer of Wave demultiplexer that the 4th execution mode of the present utility model relates to.
Figure 12 is the schematic circuit as the duplexer of Wave demultiplexer that the 5th execution mode of the present utility model relates to.
Figure 13 is the summary pie graph for the existing duplexer of explanation.
Embodiment
Below, with reference to the accompanying drawing limit embodiment of the present utility model is described by the limit, thereby makes the utility model more than you know.
Fig. 1 is the schematic circuit as the duplexer 1 of Wave demultiplexer that first execution mode of the present utility model relates to.Duplexer 1 is corresponding to UMTS-BAND2.In UMTS-BAND2, the transmitter side passband is 1850～1910MHz, and the receiver side passband is 1930～1990MHz.
Duplexer 1 has antenna terminal 2, first and second receives terminal 3,4 and send terminal 5.
Antenna terminal 2 has connected the match circuit that is made of inductor 6.One end of inductor 6 is connected with antenna terminal 2, and the other end is connected with earthing potential.
Between antenna terminal 2 and transmission terminal 5, be connected with transmitting filter 20.Transmitting filter 20 is made of the acoustic surface wave filter that adopts the ladder type circuit structure.That is, transmitting filter 20 has: first, second and the 3rd series arm resonator 201,202,203, be configured in respectively to antenna terminal 2 with send the series arm 211 that terminal 5 is connected; First, second and the 3rd parallel arm resonator 204,205,206 are configured in the parallel arm 212,213,214 that series arm 211 is connected with earthing potential respectively; Inductor 207～209; Capacitor 210.First series arm resonator 201 is made of elastic surface wave resonator 201a, 201b, 201c.Second series arm resonator 202 is made of elastic surface wave resonator 202a, 202b, 202c.The 3rd series arm resonator 203 is made of elastic surface wave resonator 203a, 203b, 203c.The first parallel arm resonator 204 is made of elastic surface wave resonator 204a, 204b.The second parallel arm resonator 205 is made of elastic surface wave resonator 205a, 205b.The 3rd parallel arm resonator 206 is made of elastic surface wave resonator 206a, 206b.Elastic surface wave resonator 201a, 201b, 201c, 202a, 202b, 202c, 203a, 203b, 203c, 204a, 204b, 205a, 205b, 206a, 206b have 1 IDT respectively and are disposed at 1 group of reflector of the elastic surface direction of wave travel both sides of this IDT.One end of inductor 207 is connected with earthing potential, and the other end is connected with the points of common connection of the first parallel arm resonator 204 and the second parallel arm resonator 205.One end of inductor 208 is connected with earthing potential, and the other end is connected with the 3rd parallel arm resonator 206.Inductor 209 and capacitor 210 are connected the 3rd series arm resonator 203 and send between the terminal 5.
On the other hand, between antenna terminal 2 and the first and second reception terminal 3,4, be connected with receiving filter 10.Receiving filter 10 is made of the balanced type longitudinal coupling resonator type acoustic surface wave filter with balanced-unbalanced translation function.That is: in receiving filter 10, from antenna terminal 2 sides input unbalanced signal, receive terminal 3,4 output balanced signals from first, second.
In addition, receiving filter 10 constitutes: input impedance is that 50 Ω, output impedance are 100 Ω.That is, receiving filter 10 also has impedance transformation function.
Have above-mentioned balanced-unbalanced translation function and impedance transformation function for making, receiving filter 10 constitutes as shown below like that.
Receiving filter 10 has: the first longitudinal coupling resonator type acoustic surface wave filter portion 101, the second longitudinal coupling resonator type acoustic surface wave filter portion 102, the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103, the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104 and elastic surface wave resonator 105.Above-mentioned first～the 4th longitudinal coupling resonator type acoustic surface wave filter portion 101～104 and elastic surface wave resonator 105 constitute by forming the electrode that is made of Al at piezoelectric substrate.Though be not particularly limited, in the present embodiment, piezoelectric substrate is propagated the LiTaO3 substrate by 40 ° ± 5 ° Y cutting X and is constituted.
Antenna terminal 2 is connecting an end of elastic surface wave resonator 105.Elastic surface wave resonator 105 has the reflector 152,153 of IDT151 and the configuration of the both sides on the elastic surface direction of wave travel of IDT151.
End at the opposition side of the side that is connected with antenna terminal 2 of above-mentioned elastic surface wave resonator 105 is connecting first, second longitudinal coupling resonator type acoustic surface wave filter portion 101,102.
The first longitudinal coupling resonator type acoustic surface wave filter portion 101 has: along first, second and the 3rd IDT111,112 of elastic surface direction of wave travel configuration, 113 and at the reflector 114,115 of the elastic surface direction of wave travel both sides configuration that is provided with first, second and the 3rd IDT111,112,113 part.That is, the first longitudinal coupling resonator type acoustic surface wave filter portion 101 is longitudinal coupling resonator type acoustic surface wave filters of 3IDT type.
The second longitudinal coupling resonator type acoustic surface wave filter portion 102 has: along first, second and the 3rd IDT121,122 of elastic surface direction of wave travel configuration, 123 and the reflector 124,125 that is configured in the elastic surface direction of wave travel both sides that are provided with first, second and the 3rd IDT121,122,123 part.That is, the second longitudinal coupling resonator type acoustic surface wave filter portion 102 also is the longitudinal coupling resonator type acoustic surface wave filter of 3IDT type.
In addition, in the present embodiment, cascade has connected the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103 in the first longitudinal coupling resonator type acoustic surface wave filter portion 101.The 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103 equally also is the longitudinal coupling resonator type acoustic surface wave filter of 3IDT type.Therefore, the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103 has: along first, second and the 3rd IDT131,132 of elastic surface direction of wave travel configuration, 133 and the reflector 134,135 that is configured in the elastic surface direction of wave travel both sides that are provided with first, second and the 3rd IDT131,132,133 part.
On the other hand, cascade has connected the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104 in the second longitudinal coupling resonator type acoustic surface wave filter portion 102.The 4th longitudinal coupling resonator type acoustic surface wave filter portion 104 equally also is the longitudinal coupling resonator type acoustic surface wave filter of 3IDT type.Therefore, the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104 has: along first, second and the 3rd IDT141,142 of elastic surface direction of wave travel configuration, 143 and the reflector 144,145 that is configured in the elastic surface direction of wave travel both sides that are provided with first, second and the 3rd IDT141,142,143 part.
The end of the 2nd IDT112 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101 is connected with elastic surface wave resonator 105, and the other end is connected with earthing potential.That is, the 2nd IDT112 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101 is the IDT that are connected with antenna terminal 2 via elastic surface wave resonator 105.The end of the one IDT111 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101 is connected with earthing potential, and the other end is connected with an IDT131 of the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103.The end of the 3rd IDT113 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101 is connected with earthing potential, and the other end is connected with the 3rd IDT133 of the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103.Therefore, an IDT111 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101 and the 3rd IDT113 are the IDT of the side that is not connected with antenna terminal 2.
The end of the opposition side of the side that the IDT111 with the first longitudinal coupling resonator type acoustic surface wave filter portion 101 of the one IDT131 of the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103 is connected is connected earthing potential.Similarly, the end of the opposition side of the side that the 3rd IDT113 with the first longitudinal coupling resonator type acoustic surface wave filter portion 101 of the 3rd IDT133 of the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103 is connected is connected earthing potential.The end of the 2nd IDT132 of the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103 and first receives terminal 3 and is connected, and the other end and second receives terminal 4 and is connected.
The end of the 2nd IDT122 of the second longitudinal coupling resonator type acoustic surface wave filter portion 102 is connected with elastic surface wave resonator 105, and the other end is connected with earthing potential.That is, the 2nd IDT122 of the second longitudinal coupling resonator type acoustic surface wave filter portion 102 is the IDT that are connected with antenna terminal 2 via elastic surface wave resonator 105.The end of the one IDT121 of the second longitudinal coupling resonator type acoustic surface wave filter portion 102 is connected with earthing potential, and the other end is connected with an IDT141 of the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104.The end of the 3rd IDT123 of the second longitudinal coupling resonator type acoustic surface wave filter portion 102 is connected with earthing potential, and the other end is connected with the 3rd IDT143 of the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104.Therefore, an IDT121 of the second longitudinal coupling resonator type acoustic surface wave filter portion 102 and the 3rd IDT123 are the IDT of the side that is not connected with antenna terminal 2.
The end of the opposition side of the side that the IDT121 with the second longitudinal coupling resonator type acoustic surface wave filter portion 102 of the one IDT141 of the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104 is connected is connected earthing potential.Similarly, the end of the opposition side of the side that the 3rd IDT123 with the second longitudinal coupling resonator type acoustic surface wave filter portion 102 of the 3rd IDT143 of the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104 is connected is connected earthing potential.The end of the 2nd IDT142 of the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104 and first receives terminal 3 and is connected, and the other end and second receives terminal 4 and is connected.More specifically, the end of the 2nd IDT142 of the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104 is connected publicly with the end of the 2nd IDT132 of the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103, and is connected the first reception terminal 3.Similarly, the other end of the 2nd IDT142 of the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104 is connected publicly with the other end of the 2nd IDT132 of the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103, and is connected the second reception terminal 4.
In the present embodiment, terminal 3 is connected, the other end and second receives terminal 4 and is connected by the 2nd IDT132 of the 3rd, the 4th longitudinal coupling resonator type acoustic surface wave filter portion 103,104, an end and first of 142 are received, and can receive terminal 3,4 from first, second thus and export balanced signals.
In addition, point out in advance: the IDT of first～the 4th longitudinal coupling resonator type acoustic surface wave filter portion 101～104 illustrates in the mode of schematic diagram in Fig. 1.In the present embodiment, in first～the 4th longitudinal coupling resonator type acoustic surface wave filter portion 101～104, in IDT adjacent part each other, be provided with thin space electrode finger in the end of IDT.Thin space electrode finger refers to, constitutes the little part of cycle that the electrode of other parts that period ratio that the electrode of IDT refers to is formed with this IDT of thin space electrode finger refers to.
In receiving filter 10, the IDT that is connected with antenna terminal 2 of the first and second longitudinal coupling resonator type acoustic surface wave filter portion 101,102 is the 2nd IDT112,122 as aforementioned.The wavelength of the elastic wave that will be determined by the cycle that the 2nd IDT112 of the first and second longitudinal coupling resonator type acoustic surface wave filter portion 101,102,122 electrode refer to is made as λ 1.The IDT that is not connected with antenna terminal 2 of the first and second longitudinal coupling resonator type acoustic surface wave filter portion 101,102 is an IDT111, the 121 and the 3rd IDT113,123 as aforementioned.The wavelength of the elastic wave that will be determined by the cycle that an IDT111, the 121 and the 3rd IDT113 of the first and second longitudinal coupling resonator type acoustic surface wave filter portion 101,102,123 electrode refer to is made as λ 2.Present embodiment is characterised in that and satisfies λ 1＜λ 2 that the passband at transmitting filter 20 is difficult for producing ripple thus.By following experimental example this is specifically described.
Designed receiving filter 10 according to following design parameter.Wherein, the wavelength of the elastic wave that will be determined by the cycle that electrode refers to is made as λ I.
1) the first longitudinal coupling resonator type acoustic surface wave filter portion 101
First, second and the 3rd IDT111,112,113 intersection width: 19.1 λ I;
The radical that the electrode of the one IDT111 and the 3rd IDT113 refers to: 33.Wherein, the part adjacent with the 2nd IDT112 within 33 is provided with 3 thin space electrodes and refers to.
The radical that the electrode of the 2nd IDT112 refers to: 36.Wherein, within 36 with the first and the 3rd IDT111,113 adjacent parts, be respectively arranged with 8 thin space electrodes and refer to.
The radical that reflector 114,115 electrode refer to: 75;
First, second and the 3rd IDT111,112,113 and reflector 114,115 degree of metalization (metalization ration): 0.70;
First, second and the 3rd IDT111,112,113 and reflector 114,115 electrode thickness: 0.087 λ I.
The wavelength X I of the elastic wave among the 2nd IDT112 is equivalent to aforesaid λ 1, and this value is made as 1.999 μ m.In addition, the wavelength X I of the elastic wave among the first and the 3rd IDT111,113 is equivalent to aforesaid λ 2, and this value is made as 2.001 μ m.Therefore, λ 1＜λ 2.
2) the second longitudinal coupling resonator type acoustic surface wave filter portion 102
The second longitudinal coupling resonator type acoustic surface wave filter portion 102 adopts the design same with the first longitudinal coupling resonator type acoustic surface wave filter portion 101.Thus, the wavelength X I of the elastic wave among the 2nd IDT122 is equivalent to aforesaid λ 1, and this value is made as 1.999 μ m.In addition, the wavelength X I of the elastic wave among the first and the 3rd IDT121,123 is equivalent to aforesaid λ 2, and this value is made as 2.001 μ m.Therefore, λ 1＜λ 2.
3) the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103
First, second and the 3rd IDT131,132,133 intersection width: 16.0 λ I;
The radical that the electrode of the one IDT131 and the 3rd IDT133 refers to: 33.Wherein, the part adjacent with the 2nd IDT132 within 33 is provided with 3 thin space electrodes and refers to.
The radical that the electrode of the 2nd IDT132 refers to: 38.Wherein, within 38 with the first and the 3rd IDT131,133 adjacent parts, be respectively arranged with 6 thin space electrodes and refer to.
The radical that reflector 134,135 electrode refer to: 75;
First, second and the 3rd IDT131,132,133 and reflector 134,135 degree of metalization: 0.70;
First, second and the 3rd IDT131,132,133 and reflector 134,135 electrode thickness: 0.087 λ I.
4) the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104
The 4th longitudinal coupling resonator type acoustic surface wave filter portion 104 and the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103 similarly design.
5) elastic surface wave resonator 105
In elastic surface wave resonator 105, the wavelength of the elastic wave that the cycle that will be referred to by the electrode of IDT151 determines also is made as λ I.
The intersection width of IDT151: 14.4 λ I;
The radical that the electrode of IDT151 refers to: 201;
The radical that reflector 152,153 electrode refer to: 18;
IDT151 and reflector 152,153 degree of metalization: 0.60;
IDT151 and reflector 152,153 electrode thickness: 0.089 λ I.
6) design of transmitting filter
As transmitting filter 20, used the acoustic surface wave filter of the circuit structure shown in Fig. 1.Its design parameter is as described below.Wherein, the wavelength of the elastic wave that will be determined by the cycle that electrode refers to is made as λ II.
First series arm resonator 201
The logarithm that the electrode of IDT among elastic surface wave resonator 201a, 201b, the 201c refers to: 177 pairs;
The intersection width of IDT among elastic surface wave resonator 201a, 201b, the 201c: 13.15 λ II;
The radical that the electrode of the reflector among elastic surface wave resonator 201a, 201b, the 201c refers to: 21;
Wherein, elastic surface wave resonator 201a, 201b, 201c adopt identical design parameter.
Second series arm resonator 202
The logarithm that the electrode of IDT among elastic surface wave resonator 202a, 202b, the 202c refers to: 190 pairs;
The intersection width of IDT among elastic surface wave resonator 202a, 202b, the 202c: 25.21 λ II;
The radical that the electrode of the reflector among elastic surface wave resonator 202a, 202b, the 202c refers to: 21;
Wherein, elastic surface wave resonator 202a, 202b, 202c adopt identical design parameter.
The 3rd series arm resonator 203
The logarithm that the electrode of IDT among elastic surface wave resonator 203a, 203b, the 203c refers to: 161 pairs;
The intersection width of IDT among elastic surface wave resonator 203a, 203b, the 203c: 20.48 λ II;
The radical that the electrode of the reflector among elastic surface wave resonator 203a, 203b, the 203c refers to: 21;
Wherein, elastic surface wave resonator 203a, 203b, 203c adopt identical design parameter.
The first parallel arm resonator 204
The logarithm that the electrode of IDT among elastic surface wave resonator 204a, the 204b refers to: 167 pairs;
The intersection width of IDT among elastic surface wave resonator 204a, the 204b: 26.77 λ II;
The radical that the electrode of the reflector among elastic surface wave resonator 204a, the 204b refers to: 21;
Wherein, elastic surface wave resonator 204a, 204b adopt identical design parameter.
The second parallel arm resonator 205
The logarithm that the electrode of IDT among elastic surface wave resonator 205a, the 205b refers to: 166 pairs;
The intersection width of IDT among elastic surface wave resonator 205a, the 205b: 25.12 λ II;
The radical that the electrode of the reflector among elastic surface wave resonator 205a, the 205b refers to: 21;
Wherein, elastic surface wave resonator 205a, 205b adopt identical design parameter.
The 3rd parallel arm resonator 206
The logarithm that the electrode of IDT among elastic surface wave resonator 206a, the 206b refers to: 127 pairs;
The intersection width of IDT among elastic surface wave resonator 206a, the 206b: 20.47 λ II;
The radical that the electrode of the reflector among elastic surface wave resonator 206a, the 206b refers to: 21;
Wherein, elastic surface wave resonator 206a, 206b adopt identical design parameter.
In order to compare, prepared the duplexer of first comparative example.In the duplexer of first comparative example, in the first longitudinal coupling resonator type acoustic surface wave filter portion 101, the wavelength X 2 of the elastic wave among the first and the 3rd IDT111,113 is made as 2.001 μ m, the wavelength X 1 of the elastic wave among the 2nd IDT112 is made as 2.013 μ m.And, in the second longitudinal coupling resonator type acoustic surface wave filter portion 102, the wavelength X 2 of the elastic wave among the first and the 3rd IDT121,123 is made as 2.001 μ m, the wavelength X 1 of the elastic wave among the 2nd IDT122 is made as 2.013 μ m.About other points, similarly formed the duplexer of first comparative example with the duplexer 1 of first execution mode.
Therefore, in the duplexer of first comparative example, in receiving filter 10, with the wavelength X 1 of elastic wave among the 2nd IDT112,122 that antenna terminal 2 is connected, greater than the i.e. wavelength X 2 of the elastic wave among the first and the 3rd IDT111,121,113,123 of the IDT that is not connected with antenna terminal.That is, satisfy λ 1＞λ 2.
Fig. 2 illustrates the filter characteristic of the transmitting filter in the duplexer of the filter characteristic of the transmitting filter 20 in the duplexer 1 of first execution mode and first comparative example.In Fig. 2, solid line illustrates the filter characteristic of the transmitting filter 20 in the duplexer 1 of first execution mode, is shown in dotted line the filter characteristic of the transmitting filter in the duplexer of first comparative example.
As shown in Figure 2, in the duplexer of first comparative example, produced ripple A at the passband high frequency side of transmitting filter, the abruptness of passband high frequency side reduces.Relative with it, in the duplexer 1 of first execution mode, do not observe ripple at the passband high frequency side of transmitting filter 20, the abruptness of passband high frequency side is good.
Below, prepared the duplexer of second comparative example.In second comparative example, in the first longitudinal coupling resonator type acoustic surface wave filter portion 101, the wavelength X 2 of the elastic wave among the first and the 3rd IDT111,113 and the wavelength X 1 of the elastic wave among the 2nd IDT112 all are made as 2.001 μ m, in the second longitudinal coupling resonator type acoustic surface wave filter portion 102, the wavelength X 2 of the elastic wave among the first and the 3rd IDT121,123 and the wavelength X 1 of the elastic wave among the 2nd IDT122 all are made as 2.001 μ m.That is, be made as λ 1=λ 2.About other points, similarly constituted the duplexer of second comparative example with the duplexer 1 of first execution mode.
Fig. 3 illustrates the filter characteristic of the transmitting filter in the duplexer of the filter characteristic of the transmitting filter 20 in the duplexer 1 of first execution mode and second comparative example.In Fig. 3, solid line illustrates the filter characteristic of the transmitting filter 20 in the duplexer 1 of first execution mode, is shown in dotted line the filter characteristic of the transmitting filter in the duplexer of second comparative example.In addition, represent after the part amplification that Fig. 4 will be surrounded by the X of Fig. 3.By Fig. 3 and Fig. 4 as can be known, in the duplexer of second comparative example, produced ripple B at the passband high frequency side of transmitting filter, the abruptness of passband high frequency side has reduced.Relative with it, in the duplexer 1 of first execution mode, do not observe ripple at the passband high frequency side of transmitting filter 20, the abruptness of passband high frequency side is good.
As mentioned above, in the duplexer 1 of first execution mode, do not produce ripple at the passband high frequency side of transmitting filter 20.This reason below is described.
In receiving filter 10, the 2nd IDT122 of the 2nd IDT112 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101 and the second longitudinal coupling resonator type acoustic surface wave filter portion 102 is connected with antenna terminal 2 via elastic surface wave resonator 105.Therefore, the 2nd IDT122 of the 2nd IDT112 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101 and the second longitudinal coupling resonator type acoustic surface wave filter portion 102 also is electrically connected with transmitting filter 20.Therefore, the filter characteristic of the properties influence transmitting filter 20 of the 2nd IDT122 of the characteristic of the 2nd IDT112 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101 and the second longitudinal coupling resonator type acoustic surface wave filter portion 102.
Based on the response of the 2nd IDT112 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101 with based on the response of the 2nd IDT122 of the second longitudinal coupling resonator type acoustic surface wave filter portion 102, be created in than the more close lower frequency side of the passband of receiving filter 10.As previously mentioned, because the 2nd IDT122 of the 2nd IDT112 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101 and the second longitudinal coupling resonator type acoustic surface wave filter portion 102 also is electrically connected with transmitting filter 20, so then can produce ripple at this passband if above-mentioned response is positioned at the frequency of the passband of transmitting filter 20.
The transmitter side passband of UMTS-BAND2 is 1850～1910MHz, and the receiver side passband is 1930～1990MHz.Therefore, the frequency interval between transmitter side passband and the receiver side passband is 20MHz.
The transmitter side passband of UMTS-BAND3 is 1710～1795MHz, and the receiver side passband is 1805～1880MHz.Therefore, the frequency interval between transmitter side passband and the receiver side passband is 20MHz.
The transmitter side passband of UMTS-BAND8 is 880～915MHz, and the receiver side passband is 925～960MHz.Therefore, the frequency interval between transmitter side passband and the receiver side passband is 10MHz.
As UMTS-BAND2,3,8, the frequency interval between transmitter side passband and receiver side passband is narrow to the situation of 10～20MHz, is easy to generate ripple as described above in the passband of transmitting filter 20.
In the duplexer 1 of present embodiment, in the first longitudinal coupling resonator type acoustic surface wave filter portion 101 of receiving filter 10, the wavelength X 1 of the elastic wave among the 2nd IDT112 is less than the wavelength X 2 of the elastic wave among the first and the 3rd IDT111,113.In addition, in the second longitudinal coupling resonator type acoustic surface wave filter portion 102, the wavelength X 1 of the elastic wave among the 2nd IDT122 is also less than the wavelength X 2 of the elastic wave among the first and the 3rd IDT121,123.Namely, in the duplexer 1 of present embodiment, in receiving filter 10, the IDT that is connected with antenna terminal 2 is that the wavelength X 1 of the elastic wave among the 2nd IDT112,122 is the wavelength X 2 of the elastic wave among the first and the 3rd IDT111,113,121,123 less than the IDT that is not connected with antenna terminal 2.
Its result, based on the response of the 2nd IDT112 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101 with based on the response of the 2nd IDT122 of the second longitudinal coupling resonator type acoustic surface wave filter portion 102, be positioned at than the more close high frequency side of the passband of transmitting filter 20.Thus, in the passband of transmitting filter 20, can not produce ripple.
In other words, above-mentioned wavelength X 1 is set less than λ 2, makes that at the IDT that occurs than the more close high frequency side of the passband of transmitting filter 20 being connected with antenna terminal 2 be the 2nd IDT112,122 response.
In addition, the first and the 3rd IDT111 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101, the 113 and the 2nd IDT112 carry out acoustical coupling.Similarly, the first and the 3rd IDT121 of the second longitudinal coupling resonator type acoustic surface wave filter portion 102, the 123 and the 2nd IDT122 carry out acoustical coupling.
That is, the first and the 3rd IDT121 of the first and the 3rd IDT111 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101, the 113 and second longitudinal coupling resonator type acoustic surface wave filter portion 102,123 only is connected with transmitting filter 20 by acoustical coupling.Therefore, even if it is all set the first and the 3rd IDT111 of the first longitudinal coupling resonator type acoustic surface wave filter portion 101,113 wavelength and the first and the 3rd IDT121 of the second longitudinal coupling resonator type acoustic surface wave filter portion 102,123 wavelength bigger, also very little to the influence of transmitting filter 20.Thus, duplexer 1 according to present embodiment, in receiving filter 10, by the IDT that will be connected with antenna terminal 2 namely the elastic wave among the 2nd IDT112,122 wavelength X 1 and the IDT that is not connected with antenna terminal 2 namely the wavelength X 2 of the elastic wave among the first and the 3rd IDT111,113,121,123 be set at λ 1＜λ 2, thereby can prevent the passband high frequency side generation ripple at transmitting filter 20 reliably.
In addition, as described in present embodiment, have at IDT under the situation of thin space electrode finger, the wavelength of the elastic wave during the wavelength of the elastic wave in the thin space electrode finger divides than other electrode fingers of IDT is very little.Therefore, the response based on thin space electrode finger can be positioned at than the more close high frequency side of the passband of transmitting filter 20.Therefore, even if be provided with thin space electrode finger, can the passband of transmitting filter 20 not exerted an influence yet.
Below, as the variation of above-mentioned first execution mode, make the duplexer of first～the 3rd following variation, and measured the filter characteristic of transmitting filter 20.
Duplexer as first variation, in the first longitudinal coupling resonator type acoustic surface wave filter portion 101 in the above-described first embodiment, the wavelength X 2 of the elastic wave among the first and the 3rd IDT111,113 is made as 2.015 μ m, the wavelength X 1 of the elastic wave among the 2nd IDT112 is made as 1.999 μ m.In the second longitudinal coupling resonator type acoustic surface wave filter portion 102, the wavelength X 2 of the elastic wave among the first and the 3rd IDT121,123 is made as 2.015 μ m, the wavelength X 1 of the elastic wave among the 2nd IDT122 is made as 1.999 μ m.In addition, same with the duplexer 1 of above-mentioned first execution mode.
Fig. 5 illustrates the filter characteristic of the transmitting filter 20 in the duplexer of the filter characteristic of the transmitting filter 20 in the duplexer 1 of above-mentioned first execution mode and first variation.In Fig. 5, solid line illustrates the filter characteristic of the transmitting filter 20 in the duplexer 1 of first execution mode, is shown in dotted line the filter characteristic of the transmitting filter 20 in the duplexer of first variation.As shown in Figure 5, in the transmitting filter 20 in the duplexer of first variation, though the abruptness of transmitting filter 20 filter characteristics in the duplexer 1 of first execution mode has deterioration slightly, at the passband high frequency side of transmitting filter 20 ripple does not appear but.Therefore, according to the result of first variation also as can be known: in receiving filter 10, by the IDT that will be connected with antenna terminal 2 namely the elastic wave among the 2nd IDT112,122 wavelength X 1 and the IDT that is not connected with antenna terminal 2 namely the wavelength X 2 of the elastic wave among the first and the 3rd IDT111,113,121,123 be made as λ 1＜λ 2, can prevent the passband high frequency side generation ripple at transmitting filter 20 reliably.
Duplexer as second variation, in the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103 in the first embodiment, must be less than the wavelength of the elastic wave among the first and the 3rd IDT131,133 with the wavelength set of the elastic wave among the 2nd IDT132.In addition, in the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104, must be less than the wavelength of the elastic wave among the first and the 3rd IDT141,143 with the wavelength set of the elastic wave among the 2nd IDT142.In addition, same with the duplexer 1 of above-mentioned first execution mode.Therefore, in the duplexer of second variation also be: in the first and second longitudinal coupling resonator type acoustic surface wave filter portion 101,102 of receiving filter 10, the IDT that is connected with antenna terminal 2 i.e. wavelength X 1 and the IDT that is not connected with antenna terminal 2 of the elastic wave among the 2nd IDT112,122 is that the wavelength X 2 of the elastic wave among the first and the 3rd IDT111,113,121,123 is set as λ 1＜λ 2.
Fig. 6 illustrates the filter characteristic of the transmitting filter 20 in the duplexer of the filter characteristic of the transmitting filter 20 in the duplexer 1 of first execution mode and second variation.In Fig. 6, solid line illustrates the filter characteristic of the transmitting filter 20 in the duplexer 1 of first execution mode, is shown in dotted line the filter characteristic of the transmitting filter 20 in the duplexer of second variation.As shown in Figure 6, even if in the duplexer of second variation, do not have ripple to occur at the passband high frequency side of transmitting filter 20 yet.
Duplexer as the 3rd variation, in the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103 in the first embodiment, must be greater than the wavelength of the elastic wave among the first and the 3rd IDT131,133 with the wavelength set of the elastic wave among the 2nd IDT132.In addition, in the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104, must be greater than the wavelength of the elastic wave among the first and the 3rd IDT141,143 with the wavelength set of the elastic wave among the 2nd IDT142.In addition, same with the duplexer 1 of above-mentioned first execution mode.Therefore, in the duplexer of the 3rd variation also be: in the first and second longitudinal coupling resonator type acoustic surface wave filter portion 101,102 of receiving filter 10, the IDT that is connected with antenna terminal 2 i.e. wavelength X 1 and the IDT that is not connected with antenna terminal 2 of the elastic wave among the 2nd IDT112,122 is that the wavelength X 2 of the elastic wave among the first and the 3rd IDT111,113,121,123 is set as λ 1＜λ 2.
Fig. 7 illustrates the filter characteristic of the transmitting filter 20 in the duplexer of the filter characteristic of the transmitting filter 20 in the duplexer 1 of first execution mode and the 3rd variation.In Fig. 7, solid line illustrates the filter characteristic of the transmitting filter 20 in the duplexer 1 of first execution mode, is shown in dotted line the filter characteristic of the transmitting filter 20 in the duplexer of the 3rd variation.As shown in Figure 7, even if in the duplexer of the 3rd variation, do not have ripple to occur at the passband high frequency side of transmitting filter 20 yet.
In addition, first～the 3rd IDT141～143 of first～the 3rd IDT131～133 of the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103 and the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104 are connected with transmitting filter 20 by acoustical coupling.Therefore, first～the 3rd IDT131～133 of the 3rd and the 4th longitudinal coupling resonator type acoustic surface wave filter portion 103,104,141～143 caused influences to transmitting filter 20 are very little.Thereby, even if as can be known in the duplexer of second variation and the 3rd variation, also same with the duplexer 1 of first execution mode, by the IDT that in receiving filter 10, will be connected with antenna terminal 2 namely the elastic wave among the 2nd IDT112,122 wavelength X 1 and the IDT that is not connected with antenna terminal 2 namely the wavelength X 2 of the elastic wave among the first and the 3rd IDT111,113,121,123 be made as λ 1＜λ 2, also can prevent the passband high frequency side generation ripple at transmitting filter 20 reliably.
Below, studied the IDT that in the receiving filter 10 of the duplexer 1 of above-mentioned first execution mode, will be connected with antenna terminal 2 namely the wavelength X 1 of the elastic wave among the 2nd IDT112,122 to be set at than the IDT that is not connected with antenna terminal 2 be that wavelength X 2 little how many degree of the elastic wave among the first and the 3rd IDT111,113,121,123 are for good.Fig. 8 illustrates the result.
Fig. 8 is illustrated in the first longitudinal coupling resonator type acoustic surface wave filter portion 101 of receiving filter 10 of duplexer 1 of first execution mode, the wavelength X 1 that makes the elastic wave among the 2nd IDT112 changes with respect to the wavelength X 2 of the elastic wave among the first and the 3rd IDT111,113, and has measured the result of abruptness of the passband high frequency side of transmitting filter 20.The transverse axis of Fig. 8 is than λ 1/ λ 2, and the passband high frequency side attenuation that the longitudinal axis is illustrated in transmitting filter 20 is the difference on the frequency between the frequency location of 3.4dB and the frequency location that attenuation is 40dB.Wherein, in the second longitudinal coupling resonator type acoustic surface wave filter portion 102, also make than λ 1/ λ 2 and the first longitudinal coupling resonator type acoustic surface wave filter portion 101 similarly to change.
Transmitter side passband and the frequency interval between the receiver side passband of UMTS-BAND2 are 20MHz.If consider frequency-temperature characteristic, the caused frequency departure of machining deviation, then preferred above-mentioned abruptness is below 11MHz.
As shown in Figure 8, if λ 1/ λ 2 to 1.0 little then abruptnesses almost reach capacity, as if λ 1/ λ 2 0.998 with the next abruptness that obtains below the 11MHz.Therefore, preferred λ 1/ λ 2 is below 0.998.
In the duplexer 1 of first execution mode, though receiving filter 10 is made of first～the 4th longitudinal coupling resonator type acoustic surface wave filter portion 101～104 and elastic surface wave resonator 105, receiving filter is not limited to this formation in the duplexer in the utility model.
Below, second～the 5th different execution mode of form of receiving filter is described.Wherein, in Fig. 9～Figure 12 described later of expression second～the 5th execution mode, omitted the diagram of transmitting filter 20.In second～the 5th execution mode, about transmitting filter 20, can similarly constitute with first execution mode.
Fig. 9 is the schematic circuit of the duplexer 21 of second execution mode of the present utility model.
In the duplexer 21 of second execution mode, same with the duplexer 1 of first execution mode, receiving filter 22 has: first～the 4th longitudinal coupling resonator type acoustic surface wave filter portion 101～104 and the elastic surface wave resonator 105.Duplexer 1 difference of the duplexer 21 of second execution mode and first execution mode is, the 3rd and the 4th longitudinal coupling resonator type acoustic surface wave filter portion 103,104 with first, second receive terminal 3,4 be connected structure.That is, in the present embodiment, the end of the 2nd IDT132 of the 3rd longitudinal coupling resonator type acoustic surface wave filter portion 103 and first receives terminal 3 and is connected, and the other end is connected with earthing potential.Similarly, the end of the 2nd IDT142 of the 4th longitudinal coupling resonator type acoustic surface wave filter portion 104 and second receives terminal 4 and is connected, and the other end is connected with earthing potential.Like this, the connection structure that is used for the output balanced signal can suitably be out of shape.
In the present embodiment, because first, second longitudinal coupling resonator type acoustic surface wave filter portion 101,102 also similarly constitutes with first execution mode, thereby by the IDT that will be connected with antenna terminal 2 namely the elastic wave among the 2nd IDT112,122 wavelength X 1 and the IDT that is not connected with antenna terminal 2 namely the wavelength X 2 of the elastic wave among the first and the 3rd IDT111,113,121,123 be made as λ 1＜λ 2, can prevent the passband high frequency side generation ripple at transmitting filter 20 reliably.
Figure 10 is the schematic circuit of the duplexer 31 of the 3rd execution mode of the present utility model.
In the duplexer 31 of the 3rd execution mode, receiving filter 32 has: elastic surface wave resonator 105 and first, second longitudinal coupling resonator type acoustic surface wave filter portion 33,34.The first longitudinal coupling resonator type acoustic surface wave filter portion 33 has: along first, second and third IDT331,332,333 of elastic surface direction of wave travel configuration, at the reflector 334,335 of the elastic surface direction of wave travel both sides configuration that is provided with first, second and third IDT331,332,333 part.That is, the first longitudinal coupling resonator type acoustic surface wave filter portion 33 is longitudinal coupling resonator type acoustic surface wave filters of 3IDT type.The second longitudinal coupling resonator type acoustic surface wave filter portion 34 equally also is the longitudinal coupling resonator type acoustic surface wave filter of 3IDT type.Therefore, the second longitudinal coupling resonator type acoustic surface wave filter portion 34 has: along first, second and third IDT341,342 of elastic surface direction of wave travel configuration, 343 and the reflector 344,345 that is configured in the elastic surface direction of wave travel both sides that are provided with first, second and third IDT341,342,343 part.33 cascades have connected the second longitudinal coupling resonator type acoustic surface wave filter portion 34 in the first longitudinal coupling resonator type acoustic surface wave filter portion.
In the present embodiment, the end of the 2nd IDT332 of the first longitudinal coupling resonator type acoustic surface wave filter portion 33 is connected with antenna terminal 2 via elastic surface wave resonator 105, and the other end is connected with earthing potential.The first, the 3rd IDT331, each end of 333 are connected with earthing potential.The other end of the one IDT331 is connected with the end of an IDT341 of the second longitudinal coupling resonator type acoustic surface wave filter portion 34.The other end of the one IDT341 is connected with earthing potential.Equally, the other end of the 3rd IDT333 is connected with the end of the 3rd IDT343 of the second longitudinal coupling resonator type acoustic surface wave filter portion 34.The other end of the 3rd IDT343 is connected with earthing potential.
The 2nd IDT342 of the second longitudinal coupling resonator type acoustic surface wave filter portion 34 is divided on the elastic surface direction of wave travel, has first, second and cuts apart the 342a of IDT portion, 342b.First cuts apart the 342a of IDT portion and first receives terminal 3 and is connected.Second cuts apart the 342b of IDT portion and second receives terminal 4 and is connected.
In this formation, by the IDT that will be connected with antenna terminal 2 namely the elastic wave among the 2nd IDT332 of the first longitudinal coupling resonator type acoustic surface wave filter portion 33 wavelength X 1 and the IDT that is not connected with antenna terminal 2 namely the wavelength X 2 of the elastic wave among the first, the 3rd IDT331,333 be made as λ 1＜λ 2, also can reliably prevent the passband high frequency side generation ripple of transmitting filter 20.
Figure 11 is the schematic circuit of the duplexer 41 of the 4th execution mode of the present utility model.
In the duplexer 41 of the 4th execution mode, receiving filter 42 has: elastic surface wave resonator 105 and first, second longitudinal coupling resonator type acoustic surface wave filter portion 43,44.
The first longitudinal coupling resonator type acoustic surface wave filter portion 43 has: along first, second and the 3rd IDT431,432 of elastic surface direction of wave travel configuration, 433 and at the reflector 434,435 of the elastic surface direction of wave travel both sides configuration that is provided with first, second and the 3rd IDT431,432,433 part.That is, the first longitudinal coupling resonator type acoustic surface wave filter portion 43 is longitudinal coupling resonator type acoustic surface wave filters of 3IDT type.The second longitudinal coupling resonator type acoustic surface wave filter portion 44 equally also is the longitudinal coupling resonator type acoustic surface wave filter of 3IDT type.Therefore, the second longitudinal coupling resonator type acoustic surface wave filter portion 44 has: along first, second and the 3rd IDT441,442 of elastic surface direction of wave travel configuration, 443 and the reflector 444,445 that is configured in the elastic surface direction of wave travel both sides that are provided with first, second and the 3rd IDT441,442,443 part.The first longitudinal coupling resonator type acoustic surface wave filter portion 43 and the second longitudinal coupling resonator type acoustic surface wave filter portion 44 are connected in parallel.
In the present embodiment, the first, the 3rd IDT431 of the first longitudinal coupling resonator type acoustic surface wave filter portion 43, each end of 433 are connected publicly, and be connected with antenna terminal 2 via elastic surface wave resonator 105, each other end is connected with earthing potential.The end of the 2nd IDT432 is connected with earthing potential, and the other end and first receives terminal 3 and is connected.
Equally, the first, the 3rd IDT441 of the second longitudinal coupling resonator type acoustic surface wave filter portion 44, each end of 443 are connected publicly, and are connected with antenna terminal 2 via elastic surface wave resonator 105, and each other end is connected with earthing potential.The end of the 2nd IDT442 is connected with earthing potential, and the other end and second receives terminal 4 and is connected.
In this formation, by the IDT that will be connected with antenna terminal 2 namely the first longitudinal coupling resonator type acoustic surface wave filter portion 43 first, the 3rd IDT431, first of the 433 and second longitudinal coupling resonator type acoustic surface wave filter portion 44, the 3rd IDT441, the wavelength X 1 of the elastic wave in 443, not the IDT that is connected with antenna terminal 2 namely the wavelength X 2 of the elastic wave among the 2nd IDT442 of the 2nd IDT432 of the first longitudinal coupling resonator type acoustic surface wave filter portion 43 and the second longitudinal coupling resonator type acoustic surface wave filter portion 44 be made as λ 1＜λ 2, also can prevent from reliably producing ripple at the passband high frequency side of transmitting filter 20.
Figure 12 is the schematic circuit of the duplexer 51 of the 5th execution mode of the present utility model.
In the duplexer 51 of the 5th execution mode, receiving filter 52 has elastic surface wave resonator 105 and longitudinal coupling resonator type acoustic surface wave filter portion 53.
Longitudinal coupling resonator type acoustic surface wave filter portion 53 has: along first～the 5th IDT531～535 of elastic surface direction of wave travel configuration and the reflector 536,537 that is configured in the elastic surface direction of wave travel both sides of the part that is provided with first～the 5th IDT531～535.That is, longitudinal coupling resonator type acoustic surface wave filter portion 53 is longitudinal coupling resonator type acoustic surface wave filters of 5IDT type.
In the present embodiment, the first, the 3rd and the 5th IDT531 of longitudinal coupling resonator type acoustic surface wave filter portion 53, each end of 533,535 are connected publicly, and be connected with antenna terminal 2 via elastic surface wave resonator 105, each other end is connected with earthing potential.On the other hand, the end of the 2nd IDT532 is connected with earthing potential, and the other end and first receives terminal 3 and is connected.In addition, the end of the 4th IDT534 is connected with earthing potential, and the other end and second receives terminal 4 and is connected.
In this formation, by the IDT that will be connected with antenna terminal 2 be the elastic wave among the first, the 3rd and the 5th IDT531,533,535 of longitudinal coupling resonator type acoustic surface wave filter portion 53 wavelength X 1 and the IDT that is not connected with antenna terminal 2 namely the wavelength X 2 of the elastic wave among the second and the 4th IDT532,534 be made as λ 1＜λ 2, also can prevent from reliably producing ripple at the passband high frequency side of transmitting filter 20.
In addition, in second～the 5th execution mode, though omitted formation about transmitting filter 20, transmitting filter 20 can similarly constitute with first execution mode.In addition, the utility model as described above in receiving filter with IDT that antenna terminal is connected in elastic wave wavelength X 1 and not with IDT that antenna terminal is connected in the wavelength X 2 of elastic wave between the pass fasten and have feature, the structure of transmitting filter is not particularly limited itself.
In above-mentioned first～the 5th execution mode and first～the 3rd comparative example, though constituted receiving filter by the longitudinal coupling resonator type acoustic surface wave filter that has utilized elastic surface wave, also can constitute receiving filter by the longitudinal coupling resonator type elastic boundary wave filter that has utilized boundary acoustic wave.
Symbol description
1 ... duplexer
2 ... antenna terminal
3,4 ... first, second receives terminal
5 ... send terminal
6 ... inductor
10 ... receiving filter
20 ... transmitting filter
21 ... duplexer
22 ... receiving filter
31 ... duplexer
32 ... receiving filter
33 ... the first longitudinal coupling resonator type acoustic surface wave filter portion
34 ... the second longitudinal coupling resonator type acoustic surface wave filter portion
41 ... duplexer
42 ... receiving filter
43 ... the first longitudinal coupling resonator type acoustic surface wave filter portion
44 ... the second longitudinal coupling resonator type acoustic surface wave filter portion
51 ... duplexer
52 ... receiving filter
53 ... longitudinal coupling resonator type acoustic surface wave filter portion
101 ... the first longitudinal coupling resonator type acoustic surface wave filter portion
102 ... the second longitudinal coupling resonator type acoustic surface wave filter portion
103 ... the 3rd longitudinal coupling resonator type acoustic surface wave filter portion
104 ... the 4th longitudinal coupling resonator type acoustic surface wave filter portion
105 ... elastic surface wave resonator
111～113 ... first～the 3rd IDT
114,115 ... reflector
121～123 ... first～the 3rd IDT
124,125 ... reflector
131～133 ... first～the 3rd IDT
134,135 ... reflector
141～143 ... first～the 3rd IDT
144,145 ... reflector
151…IDT
152,153 ... reflector
201 ... first series arm resonator
201a～201c ... elastic surface wave resonator
202 ... second series arm resonator
202a～202c ... elastic surface wave resonator
203 ... the 3rd series arm resonator
203a～203c ... elastic surface wave resonator
204 ... the first parallel arm resonator
204a, 204b ... elastic surface wave resonator
205 ... the second parallel arm resonator
205a, 205b ... elastic surface wave resonator
206 ... the 3rd parallel arm resonator
206a, 206b ... elastic surface wave resonator
207～209 ... inductor
210 ... capacitor
211 ... series arm
212～214 ... parallel arm
331～333 ... first～the 3rd IDT
334,335 ... reflector
341～343 ... first～the 3rd IDT
342a, 342b ... first, second cuts apart IDT portion
344,345 ... reflector
431～433 ... first～the 3rd IDT
434,435 ... reflector
441～443 ... first～the 3rd IDT
444,445 ... reflector
531～535 ... first～the 5th IDT
536,537 ... reflector

Claims (13)

1. a Wave demultiplexer possesses antenna terminal, receives terminal and sends terminal, and this Wave demultiplexer also possesses:
Receiving filter, it is connected between described antenna terminal and the described reception terminal, is made of the longitudinal coupling resonator type acoustic wave filter; With
Transmitting filter, it is connected between described antenna terminal and the described transmission terminal,
Described longitudinal coupling resonator type acoustic wave filter has along at least 3 IDT of elastic wave propagation direction configuration, and at least 1 IDT among described at least 3 IDT is connected with described antenna terminal, and all the other IDT are not connected with described antenna terminal,
Will with IDT that described antenna terminal is connected in the wavelength of elastic wave be made as λ 1, will be not with IDT that described antenna terminal is connected in the wavelength of elastic wave when being made as λ 2, satisfy λ 1＜λ 2.
2. Wave demultiplexer according to claim 1, wherein,
Ratio λ 1/ λ 2 of described λ 1 and described λ 2 is below 0.998.
3. Wave demultiplexer according to claim 1, wherein,
Described reception terminal has first, second and receives terminal,
Described longitudinal coupling resonator type acoustic wave filter has: first, second 3IDT type longitudinal coupling resonator type acoustic wave filter portion that is connected in parallel in described antenna terminal; Respectively with described first, the 3rd of the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter ministerial level connection connection, the 4th 3IDT type longitudinal coupling resonator type acoustic wave filter portion, the described the 3rd, the 4th 3IDT type longitudinal coupling resonator type acoustic wave filter portion is respectively with described first, second receives terminal connects, with described first, when 3 IDT of the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter portion are made as first～the 3rd IDT respectively along the elastic wave propagation direction, described first, each the 2nd IDT of the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter portion is connected with described antenna terminal, and each is first years old, the 3rd IDT is not connected with described antenna terminal.
4. Wave demultiplexer according to claim 2, wherein,
Described reception terminal has first, second and receives terminal,
Described longitudinal coupling resonator type acoustic wave filter has: first, second 3IDT type longitudinal coupling resonator type acoustic wave filter portion that is connected in parallel in described antenna terminal; Respectively with described first, the 3rd of the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter ministerial level connection connection, the 4th 3IDT type longitudinal coupling resonator type acoustic wave filter portion, the described the 3rd, the 4th 3IDT type longitudinal coupling resonator type acoustic wave filter portion is respectively with described first, second receives terminal connects, with described first, when 3 IDT of the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter portion are made as first～the 3rd IDT respectively along the elastic wave propagation direction, described first, each the 2nd IDT of the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter portion is connected with described antenna terminal, and each is first years old, the 3rd IDT is not connected with described antenna terminal.
5. Wave demultiplexer according to claim 1, wherein,
Described reception terminal has first, second and receives terminal,
Described longitudinal coupling resonator type acoustic wave filter has and is connected in parallel in first of described antenna terminal, the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter portion, described first, the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter portion is respectively with described first, second receives terminal connects, with described first, when 3 IDT of the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter portion are made as first～the 3rd IDT along the elastic wave propagation direction, described first, the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter portion each first, the 3rd IDT is connected with described antenna terminal, and each the 2nd IDT is not connected with described antenna terminal and respectively with described first, second receives terminal connects.
6. Wave demultiplexer according to claim 2, wherein,
Described reception terminal has first, second and receives terminal,
Described longitudinal coupling resonator type acoustic wave filter has and is connected in parallel in first of described antenna terminal, the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter portion, described first, the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter portion is respectively with described first, second receives terminal connects, with described first, when 3 IDT of the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter portion are made as first～the 3rd IDT along the elastic wave propagation direction, described first, the 2nd 3IDT type longitudinal coupling resonator type acoustic wave filter portion each first, the 3rd IDT is connected with described antenna terminal, and each the 2nd IDT is not connected with described antenna terminal and respectively with described first, second receives terminal connects.
7. Wave demultiplexer according to claim 1, wherein,
Described reception terminal has first and receives terminal and the second reception terminal,
Described longitudinal coupling resonator type acoustic wave filter is the 5IDT type longitudinal coupling resonator type acoustic wave filter that disposes 5 IDT along the elastic wave propagation direction.
8. Wave demultiplexer according to claim 2, wherein,
Described reception terminal has first and receives terminal and the second reception terminal,
Described longitudinal coupling resonator type acoustic wave filter is the 5IDT type longitudinal coupling resonator type acoustic wave filter that disposes 5 IDT along the elastic wave propagation direction.
9. Wave demultiplexer according to claim 7, wherein,
When described 5 IDT in the described 5IDT type longitudinal coupling resonator type acoustic wave filter are made as first～the 5th IDT along the elastic wave propagation direction, the first, the 3rd and the 5th IDT is connected with described antenna terminal, the 2nd IDT is not connected with described antenna terminal with the 4th IDT, described the 2nd IDT and described first receives terminal and is connected, and described the 4th IDT and described second receives terminal and is connected.
10. Wave demultiplexer according to claim 8, wherein,
When described 5 IDT in the described 5IDT type longitudinal coupling resonator type acoustic wave filter are made as first～the 5th IDT along the elastic wave propagation direction, the first, the 3rd and the 5th IDT is connected with described antenna terminal, the 2nd IDT is not connected with described antenna terminal with the 4th IDT, described the 2nd IDT and described first receives terminal and is connected, and described the 4th IDT and described second receives terminal and is connected.
11. according to each described Wave demultiplexer of claim 1～10, wherein,
Described Wave demultiplexer is the channel-splitting filter corresponding with UMTS-BAND2,3 or 8 standard.
12. according to each described Wave demultiplexer of claim 1～10, wherein,
Described longitudinal coupling resonator type acoustic wave filter is the longitudinal coupling resonator type acoustic surface wave filter.
13. Wave demultiplexer according to claim 11, wherein,
Described longitudinal coupling resonator type acoustic wave filter is the longitudinal coupling resonator type acoustic surface wave filter.
CN201190000442.6U 2010-06-04 2011-05-10 Acoustic wave branching filter Expired - Lifetime CN203119851U (en)

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PCT/JP2011/060752 WO2011152176A1 (en) 2010-06-04 2011-05-10 Acoustic wave branching filter

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WO2017208629A1 (en) * 2016-05-31 2017-12-07 株式会社村田製作所 Elastic surface wave filter
JP6627816B2 (en) * 2016-06-08 2020-01-08 株式会社村田製作所 Multiplexers and high-frequency front-end modules
CN110809858B (en) * 2017-07-05 2023-09-05 株式会社村田制作所 multiplexer

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CN107483027A (en) * 2016-06-08 2017-12-15 株式会社村田制作所 Multiplexer and high frequency front-end module
CN107483027B (en) * 2016-06-08 2020-10-16 株式会社村田制作所 Multiplexer and high-frequency front-end module

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