WO2010122786A1 - アンテナ共用器 - Google Patents
アンテナ共用器 Download PDFInfo
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- WO2010122786A1 WO2010122786A1 PCT/JP2010/002862 JP2010002862W WO2010122786A1 WO 2010122786 A1 WO2010122786 A1 WO 2010122786A1 JP 2010002862 W JP2010002862 W JP 2010002862W WO 2010122786 A1 WO2010122786 A1 WO 2010122786A1
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- resonator
- filter
- antenna duplexer
- series resonator
- electromechanical coupling
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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
- H03H9/14517—Means for weighting
- H03H9/1452—Means for weighting by finger overlap length, apodisation
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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
- H03H9/008—Balance-unbalance or balance-balance networks using surface acoustic wave devices having three 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
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02637—Details concerning reflective or coupling arrays
- H03H9/02803—Weighted reflective structures
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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
- H03H9/14517—Means for weighting
- H03H9/14526—Finger withdrawal
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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
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/643—Means for obtaining a particular transfer characteristic the transfer characteristic being determined by reflective or coupling array characteristics
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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
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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
- H03H9/6479—Capacitively coupled SAW resonator filters
Definitions
- the present invention relates to an antenna duplexer having a transmission filter and a reception filter.
- an antenna duplexer has two filters (a transmission filter and a reception filter) to demultiplex a transmission band signal and a reception band signal adjacent to the high band side.
- a ladder filter in which a series resonator and a parallel resonator are connected in a ladder shape is employed as the transmission filter.
- Band 8 defined in 3GPP (3 rd Generation Partnership Project) is the interval of the transmission band and the reception band (Expressed in fractional bandwidth 1.09%) (cross-band) is 10 MHz. This is very narrow compared with 20 MHz (specific band: 2.33%), which is the interval between the Band 5 transmission band and the reception band, which is often used in the conventional antenna duplexer. Therefore, as a transmission filter, a technique is known in which IDT (Inter Digital Transducer) of a resonator in the transmission filter is weighted in order to ensure steepness corresponding to this narrow cross band.
- IDT Inter Digital Transducer
- Patent Document 1 is known as prior art document information related to the invention of this application.
- this Patent Document 1 aims at narrowing the band, and there is no method for realizing a wideband antenna duplexer having a bandwidth as high as 35 MHz (specific bandwidth: 3.9%) like Band8. Not disclosed.
- An object of the present invention is to achieve both a steepness in the cross band and a reduction in loss in the transmission passband in the transmission filter of the antenna duplexer.
- An antenna duplexer is an antenna duplexer having a first filter that passes a signal in a first frequency band and a second filter that passes a signal in a second frequency band higher than the first frequency band.
- the first filter includes a ladder type filter including a first series resonator and a second series resonator having an antiresonance frequency point higher than the antiresonance frequency of the first series resonator, and the electromechanical coupling coefficient of the first series resonator Is smaller than the electromechanical coupling coefficient of the second series resonator.
- the steepness in the cross band is improved by reducing the electromechanical coupling coefficient of the first series resonator having a relatively low antiresonance frequency that greatly affects the steepness. be able to.
- the passband width is widened, and loss in a wide transmission passband is suppressed. Can do.
- the antenna duplexer of the present invention can achieve both steepness in the crossband and reduction in loss in the transmission passband.
- FIG. 1 is a circuit schematic diagram of an antenna duplexer according to Embodiment 1 of the present invention.
- FIG. 2 is an explanatory diagram of the frequency characteristics of the antenna duplexer according to Embodiment 1 of the present invention.
- FIG. 3 is a diagram showing a resonator structure provided with electromechanical coupling coefficient reducing means in the antenna duplexer according to Embodiment 1 of the present invention.
- FIG. 4 is a diagram showing a resonator structure that is not subjected to electromechanical coupling coefficient reduction means in the antenna duplexer according to Embodiment 1 of the present invention.
- FIG. 1 is a circuit schematic diagram of an antenna duplexer according to Embodiment 1 of the present invention.
- FIG. 2 is an explanatory diagram of the frequency characteristics of the antenna duplexer according to Embodiment 1 of the present invention.
- FIG. 3 is a diagram showing a resonator structure provided with electromechanical coupling coefficient reducing means in the antenna duplexer according to Embodi
- FIG. 5 is a diagram showing a resonator structure provided with means for reducing the electromechanical coupling coefficient of the antenna duplexer according to Embodiment 2 of the present invention.
- FIG. 6 is a diagram showing a resonator structure provided with means for reducing the electromechanical coupling coefficient of the antenna duplexer according to Embodiment 3 of the present invention.
- FIG. 7 is a diagram showing a resonator structure provided with means for reducing the electromechanical coupling coefficient of the antenna duplexer according to Embodiment 4 of the present invention.
- FIG. 8 is a diagram showing a resonator structure provided with means for reducing the electromechanical coupling coefficient of the antenna duplexer according to the fifth embodiment of the present invention.
- FIG. 9 is a diagram showing a resonator structure provided with means for reducing the electromechanical coupling coefficient of the antenna duplexer according to the sixth embodiment of the present invention.
- FIG. 10 is a diagram showing a resonator structure provided with means for reducing the electromechanical coupling coefficient of the antenna duplexer according to Embodiment 7 of the present invention.
- FIG. 11 is a diagram showing a resonator structure provided with means for reducing the electromechanical coupling coefficient of the antenna duplexer according to the eighth embodiment of the present invention.
- FIG. 12 is a diagram showing a resonator structure provided with means for reducing the electromechanical coupling coefficient of the antenna duplexer according to the ninth embodiment of the present invention.
- FIG. 13 is a diagram showing a resonator structure provided with means for reducing the electric coupling coefficient of the antenna duplexer according to the tenth embodiment of the present invention.
- FIG. 14 is a diagram comparing the characteristics of the present invention and a conventional example.
- FIG. 1 is a circuit schematic diagram of an antenna duplexer for Band 8 in the first embodiment.
- an antenna duplexer 1 includes a first filter 3 and a reception filter which are formed on, for example, a lithium tantalate piezoelectric substrate (not shown) and are respectively connected to an antenna terminal 2.
- the duplexer includes a second filter 4.
- the first filter 3 passes a signal in the first frequency band, which is a transmission band of 880 MHz to 915 MHz, and the second filter 4 is 925 MHz to higher than the first frequency band.
- the first filter 3 is a ladder filter, and includes an input terminal 5, a first series resonator 6, a second series resonator 7, and a third series resonator 8 that are connected in series from the input terminal 5 to the antenna terminal 2 in order.
- a fourth series resonator 9 and a fifth series resonator 10 are provided.
- the first filter 3 includes a first parallel resonator 11 connected in parallel between the first series resonator 6 and the second series resonator 7, a third series resonator 8, and a fourth series resonance.
- Table 1 shows the resonance frequency, antiresonance frequency, capacitance, and electromechanical coupling coefficient of the resonator constituting the first filter 3 according to the first embodiment of the present invention.
- the electromechanical coupling coefficient in (Table 1) is calculated from the resonance frequency and anti-resonance frequency of the resonator by the following formula (Equation 1).
- the second filter 4 includes, for example, a sixth series resonator 14 connected to the antenna terminal 2, a first multimode elastic wave filter 15, a second multimode elastic wave filter 16, and a third multimode elastic wave filter 17.
- the first multimode elastic wave filter 15 and the second multimode elastic wave filter 16 are branched from the sixth series resonator 14 and connected.
- the third multimode elastic wave filter 17 is connected to the first multimode elastic wave filter 15 and the second multimode elastic wave filter 16, respectively.
- the second filter 4 includes output terminals 18 and 19 connected to the third multimode acoustic wave filter 17, and receives and outputs the received signals from these output terminals 18 and 19 in a balanced manner.
- the second filter 4 may be formed of a ladder type filter.
- FIG. 2 shows frequency characteristics of the series resonators 6, 7, 8, 9, 10 and the parallel resonators 11, 12, 13 of the first filter 3.
- the number of FIG. 2 shows the reference code of each resonator.
- the antiresonance frequency of the second series resonator 7 is higher than the antiresonance frequency of the first series resonator 6. Furthermore, the antiresonance frequencies of the other series resonators 8, 9, 10 are also higher than the antiresonance frequency of the first series resonator 6.
- the electromechanical coupling coefficient of the first series resonator 6 is reduced by applying electromechanical coupling coefficient reducing means to the first series resonator 6.
- the electromechanical coupling coefficient reducing means will be described in detail later.
- other series resonators including the second series resonator 7 are not subjected to electromechanical coupling coefficient reduction means.
- the steepness in the cross band is reduced by reducing the electromechanical coupling coefficient of the first series resonator 6 having a relatively low antiresonance frequency that greatly affects the steepness. Can be improved.
- the passband width is widened and a wide transmission is achieved. Loss in the pass band can be suppressed. That is, the antenna duplexer 1 of the present invention can achieve both steepness in the crossband and reduction in loss in the transmission passband.
- the capacitance ratio of the first series resonator 6 having a relatively small electromechanical coupling coefficient is relatively large. Therefore, as shown in FIG. 1, by connecting the first series resonator 6 to the outermost arm on the input terminal 5 side of the first filter 3, the first filter 3 for the transmission signal amplified by a power amplifier or the like. It is possible to improve the power durability.
- FIG. 3 An embodiment of the electromechanical coupling coefficient reducing means in the present invention is shown in FIG.
- the resonator 20 to which the electromechanical coupling coefficient reducing means is applied is sandwiched between the reflectors 22 and is apodized weighted so that the crossing width decreases stepwise from the center toward the end. It has an IDT 21 applied.
- the IDT 21 is composed of a comb-shaped electrode 21a and a comb-shaped electrode 21b.
- the cross width is a width in which the electrode finger of the adjacent comb-shaped electrode 21a and the electrode finger of the comb-shaped electrode 21b overlap.
- W shown in FIG. 3 is the intersection width.
- intersection width between the electrode finger 121a and the electrode finger 121b is represented by W1
- the intersection width between the electrode finger 121b and the electrode finger 121c is represented by W2
- the intersection width between the electrode finger 121c and the electrode finger 121d is represented by W3.
- the intersection width decreases toward the end (the left end in the drawing).
- FIG. 4 shows a resonator 23 that has not been subjected to electromechanical coupling coefficient reduction means, and an IDT 25 sandwiched between the reflectors 22 is a regular comb-shaped electrode having a substantially uniform crossing width.
- FIG. 4 is a diagram showing a resonator structure that is not subjected to electromechanical coupling coefficient reduction means in the antenna duplexer according to Embodiment 1 of the present invention.
- the number of electrode fingers constituting the IDT 25 is 180
- the crossing width is 160 ⁇ m
- the metallization ratio is 0.58
- the number of electrode fingers of the reflector 22 is 25. It is a book.
- the electromechanical coupling coefficient of the resonator 23 configured as described above is 8.35%.
- the number of electrode fingers constituting the IDT 21 is 180, the metallization ratio (electrode finger width / electrode pitch) is 0.58, and the reflection is performed.
- the number of electrode fingers of the device 22 is 25, which is the same as that of the resonator 23, except that the crossing width of the IDT 21 is 190 ⁇ m and a 20% region from one end of the IDT 21 is weighted in an arc cosine type. Different from 23.
- the electromechanical coupling coefficient reducing means described above is applied to the series resonator having a relatively low antiresonance frequency, and the above description is applied to the series resonator having a relatively high antiresonance frequency.
- the electromechanical coupling coefficient reducing means is applied to the first series resonator 6 having the lowest antiresonance frequency, and is not applied to the other series resonators and parallel resonators.
- the steepness in the cross band can be further improved and the loss in the transmission pass band can be further reduced.
- FIG. 5 shows the resonator 26 to which the electromechanical coupling coefficient reducing means is applied in the antenna duplexer of the second embodiment.
- the configuration of the antenna duplexer of the second embodiment is the same as the configuration of the antenna duplexer of the first embodiment, and is given the same reference numerals.
- the resonator 26 has an IDT 27 to which a thinning weight 24 is applied so that the input / output electrode fingers of the comb-shaped electrode 27a and the comb-shaped electrode 27b do not cross each other.
- the number of electrode fingers constituting the IDT 27 is 180, the metallization ratio (electrode finger width / electrode pitch) is 0.58, and the reflector 22.
- the number of electrode fingers is 25, which is the same as that of the resonator 23 shown in FIG. 4, but the crossing width of the IDT 27 is 170 ⁇ m, the electrode fingers of the IDT 27 are inverted at four points, and weighting is performed so as to create a non-crossing portion. This is different from the resonator 23 in that respect.
- the resonator 26 can obtain the same capacitance as the resonator 23 shown in FIG. 4 and the electromechanical coupling coefficient can be reduced to 8.15%.
- the Q value was also improved by about 2%.
- the electromechanical coupling coefficient reducing means described above is applied to the series resonator having a relatively low antiresonance frequency, and the electromechanical coupling means described above is applied to the series resonator having a relatively high antiresonance frequency.
- the electromechanical coupling coefficient reducing means is applied to the first series resonator 6 having the lowest anti-resonance frequency and not applied to the other series resonators and parallel resonators.
- the device can further improve the steepness in the crossband and further reduce the loss in the transmission passband.
- FIG. 6 shows the resonator 28 to which the electromechanical coupling coefficient reducing means is applied in the antenna duplexer of the third embodiment.
- the configuration of the antenna duplexer according to the third embodiment is the same as the configuration of the antenna duplexer according to the other embodiments, and is given the same reference numerals.
- the resonator 28 has an IDT 29 to which a weight 30 that is partially smaller in crossing width than other parts is applied.
- a weight 30 that is partially smaller in crossing width than other parts is applied.
- the intersection width W4 between the electrode finger 129a and the electrode finger 129b, and the intersection width W5 between the electrode finger 129b and the electrode finger 129c are smaller than the intersection width W of other portions.
- the number of electrode fingers constituting the IDT 29 is 180, the metallization ratio (electrode finger width / electrode pitch) is 0.58, and the reflector 22. 4 is the same as the resonator 23 shown in FIG. 4 in that the number of electrode fingers is 25, but the crossing width is 170 ⁇ m, and a part of the crossing width of the IDT 29 is 70% of the maximum crossing width and 30%. It differs in that it is weighted to be part.
- the electromechanical coupling coefficient reducing means in this way, the resonator 26 can obtain the same capacitance as the resonator 23 shown in FIG. 4 and the electromechanical coupling coefficient can be reduced to 8.16%.
- the Q value was also improved by about 2%.
- the electromechanical coupling coefficient reducing means described above is applied to the series resonator having a relatively low antiresonance frequency, and the electromechanical coupling means described above is applied to the series resonator having a relatively high antiresonance frequency.
- the electromechanical coupling coefficient reducing means is applied to the first series resonator 6 having the lowest frequency and is not applied to the other series resonators and parallel resonators. Further, the steepness in the cross band can be further improved, and the loss in the transmission pass band can be further reduced.
- FIG. 7 shows the resonator 31 to which the electromechanical coupling coefficient reducing means in the antenna duplexer of the fourth embodiment is applied.
- the configuration of the antenna duplexer according to the fourth embodiment is the same as the configuration of the antenna duplexer according to the other embodiments, and is given the same reference numerals.
- the resonator 31 has a plurality of regular-type comb-shaped electrodes IDTs 32 connected in parallel to each other, and a reflector 33 is formed between the plurality of IDTs 32. Note that reflectors 22 are also formed at both ends of the plurality of IDTs 32.
- the number of electrode fingers constituting each IDT 32 connected in parallel is 90, and the number of electrode fingers of the three reflectors 22 and 33 is each.
- the crossing width of 25 IDTs 160 ⁇ m
- an electrostatic capacity equivalent to that of the resonator 23 shown in FIG. 4 can be obtained, the electromechanical coupling coefficient can be reduced to 8.11%, and the Q value also resonates. A value similar to that of the vessel 23 was obtained.
- the electromechanical coupling coefficient reducing means described above is applied to the series resonator having a relatively low antiresonance frequency, and the electromechanical coupling means described above is applied to the series resonator having a relatively high antiresonance frequency.
- the electromechanical coupling coefficient reducing means is applied to the first series resonator 6 having the lowest anti-resonance frequency, and is not applied to the other series resonators and parallel resonators. Can further improve the steepness in the cross band and further reduce the loss in the transmission passband.
- FIG. 8 shows a resonator 34 to which an electromechanical coupling coefficient reducing means is applied in the antenna duplexer of the fifth embodiment.
- the configuration of the antenna duplexer of the fifth embodiment is the same as the configuration of the antenna duplexer of the other embodiments, and is given the same reference numerals.
- the resonators 34 are connected in parallel with IDTs 21 that have been subjected to apodization weighting so that the crossing width decreases stepwise from the center toward the end.
- the intersection width between the electrode finger 121a and the electrode finger 121b is W1
- the intersection width between the electrode finger 121b and the electrode finger 121c is W2
- the electrode finger 121c is W3
- the electrode fingers 121d are each represented by W3 and the intersection width decreases from the center toward the end (left end in the drawing).
- the other IDT 21 has the same configuration, and the crossing width decreases from the center toward the end (the right end in the drawing).
- a reflector 33 is formed between the plurality of IDTs 21.
- Reflectors 22 are also formed at both ends of the plurality of IDTs 32.
- the number of electrode fingers constituting each IDT 21 is 90, the number of electrode fingers of the three reflectors 22 and 33 is 25 each, the crossing width of the IDT 21 is 190 ⁇ m, and one end of the IDT 21 is formed. 4 to obtain an electric capacity equivalent to that of the resonator 23 shown in FIG. 4 and an electromechanical coupling coefficient as small as 7.88%. The same value was obtained. With this configuration, a resonator having a small electromechanical coupling coefficient can be obtained more efficiently.
- the electromechanical coupling coefficient reducing means described above is applied to the series resonator having a relatively low antiresonance frequency, and the electromechanical coupling means described above is applied to the series resonator having a relatively high antiresonance frequency.
- the electromechanical coupling coefficient reducing means is applied to the first series resonator 6 having the lowest anti-resonance frequency, and is not applied to the other series resonators and parallel resonators. Can further improve the steepness in the cross band and further reduce the loss in the transmission passband.
- FIG. 9 shows a resonator 35 to which an electromechanical coupling coefficient reducing means in the antenna duplexer of the sixth embodiment is applied.
- the configuration of the antenna duplexer of the sixth embodiment is the same as the configuration of the antenna duplexer of the other embodiments, and is given the same reference numerals.
- the resonator 35 is a resonator having a configuration in which IDTs 24 with thinning weights 27 that do not partially intersect input / output electrode fingers are connected in parallel and a reflector 33 is formed between the plurality of IDTs 27. .
- the number of electrode fingers constituting each IDT 24 connected in parallel is 90
- the number of electrode fingers of the three reflectors 22 and 33 is 25 each
- the crossing width of the IDT 24 is set.
- the electromechanical coupling coefficient reducing means described above is applied to the series resonator having a relatively low antiresonance frequency, and the electromechanical coupling means described above is applied to the series resonator having a relatively high antiresonance frequency.
- the electromechanical coupling coefficient reducing means is applied to the first series resonator 6 having the lowest anti-resonance frequency, and is not applied to the other series resonators and parallel resonators. Can further improve the steepness in the cross band and further reduce the loss in the transmission passband.
- FIG. 14 shows a comparison between the transmission filter characteristics of the antenna duplexer of the sixth embodiment and the transmission filter characteristics of the conventional antenna duplexer. That is, the antenna duplexer of the sixth embodiment uses the resonator structure subjected to the electromechanical coupling coefficient reducing means for the first series resonator 6 and does not apply the electromechanical coupling coefficient reducing means of FIG. The resonator structure is used for another resonator. The conventional antenna duplexer uses the resonator structure of FIG. 4 without any electromechanical coupling coefficient reducing means for all resonators.
- the insertion loss at 915 MHz is 2.2 dB for the antenna duplexer of the sixth embodiment, 2.25 dB for the conventional antenna duplexer, and the attenuation at 923 MHz is 41 dB for the antenna duplexer of the present embodiment. In the duplexer, it is 32 dB. From this result, it can be seen that both the steepness in the crossband and the reduction in loss in the transmission passband can be achieved as described above.
- FIG. 10 shows the resonator 36 to which the electromechanical coupling coefficient reducing means in the antenna duplexer of the seventh embodiment is applied.
- the configuration of the antenna duplexer of the seventh embodiment is the same as the configuration of the antenna duplexer of the other embodiments, and is given the same reference numerals.
- the resonator 36 has a configuration in which IDTs 29 each having a weight 30 that is partially smaller in crossing width than other parts are connected in parallel and a reflector 33 is formed between the plurality of IDTs 29. It is a vessel.
- the number of electrode fingers constituting each IDT 29 connected in parallel is 90, the number of the three reflectors 22 and 33 is 25, and the crossing width of the IDT 29 is 160 ⁇ m.
- an electrostatic capacity equivalent to that of the resonator 23 shown in FIG. 4 was obtained, the electromechanical coupling coefficient was reduced to 7.96%, and the Q value was also comparable. With this configuration, a resonator having a small electromechanical coupling coefficient can be obtained more efficiently.
- the electromechanical coupling coefficient reducing means described above is applied to the series resonator having a relatively low antiresonance frequency, and the electromechanical coupling means described above is applied to the series resonator having a relatively high antiresonance frequency.
- the electromechanical coupling coefficient reducing means is applied to the first series resonator 6 having the lowest anti-resonance frequency, and is not applied to the other series resonators and parallel resonators. Can further improve the steepness in the cross band and further reduce the loss in the transmission passband.
- FIG. 11 shows the resonator 37 to which the electromechanical coupling coefficient reducing means in the antenna duplexer of the eighth embodiment is applied.
- the configuration of the antenna duplexer of the eighth embodiment is the same as the configuration of the antenna duplexer of the other embodiments, and is given the same reference numerals.
- the resonator 37 has a configuration in which a plurality of resonators in which reflectors 22 are arranged at both ends of an IDT 25 which is a regular comb-shaped electrode having a substantially uniform crossing width are connected in parallel. With such a configuration, a resonator having a small electromechanical coupling coefficient can be obtained.
- the electromechanical coupling coefficient reducing means described above is applied to the series resonator having a relatively low antiresonance frequency, and the electromechanical coupling means described above is applied to the series resonator having a relatively high antiresonance frequency.
- the electromechanical coupling coefficient reducing means is applied to the first series resonator 6 having the lowest anti-resonance frequency, and is not applied to the other series resonators and parallel resonators. Can further improve the steepness in the cross band and further reduce the loss in the transmission passband.
- FIG. 12 shows the resonator 38 to which the electromechanical coupling coefficient reducing means in the antenna duplexer of the ninth embodiment is applied.
- the configuration of the antenna duplexer according to the ninth embodiment is the same as the configuration of the antenna duplexer according to the other embodiments, and is given the same reference numerals.
- the resonator 38 has a plurality of regular comb-shaped electrodes IDTs 25 connected in parallel to each other, and a capacitor formed on a chip in a resonator having a reflector 33 formed between the plurality of IDTs 25. 39 is connected in parallel. With this configuration, a resonator having a small electromechanical coupling coefficient can be obtained.
- the electromechanical coupling coefficient reducing means described above is applied to the series resonator having a relatively low antiresonance frequency, and the electromechanical coupling means described above is applied to the series resonator having a relatively high antiresonance frequency.
- the electromechanical coupling coefficient reducing means is applied to the first series resonator 6 having the lowest anti-resonance frequency, and is not applied to the other series resonators and parallel resonators. Can further improve the steepness in the cross band and further reduce the loss in the transmission passband.
- Embodiment 10 Hereinafter, the antenna duplexer in Embodiment 10 will be described. Unless otherwise specified, the configuration of the antenna duplexer of the tenth embodiment is the same as the configuration of the antenna duplexer of the other embodiments.
- the first parallel resonator 11 having the lowest antiresonance frequency among the plurality of parallel resonators represented in the above (Table 1) is the IDT and this It has a configuration in which reflectors are formed at both ends of the IDT, and at least a part of the reflector has a pitch that increases toward the side farther from the side closer to the IDT.
- the first parallel resonator 11 is connected adjacent to the first series resonator 6.
- the antenna duplexer It is possible to achieve both low loss and low loss.
- the antenna duplexer according to the present invention has the effect of achieving both steepness in the crossband and reduction in loss in the transmission passband, and can be applied to electronic devices such as mobile phones.
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Abstract
Description
以下、本発明の実施の形態1について、図面を用いて説明する。図1は、実施の形態1におけるBand8用のアンテナ共用器の回路模式図である。
以下、実施の形態2におけるアンテナ共用器について、図面を用いて説明する。図5は、実施の形態2のアンテナ共用器における電気機械結合係数減少化手段が施された共振器26を示す。尚、特に説明しない限り、実施の形態2のアンテナ共用器の構成は実施の形態1のアンテナ共用器の構成と同様であり、同一の符号を付ける。
以下、実施の形態3におけるアンテナ共用器について、図面を用いて説明する。図6は、実施の形態3のアンテナ共用器における電気機械結合係数減少化手段が施された共振器28を示す。尚、特に説明しない限り、実施の形態3のアンテナ共用器の構成は他の実施の形態のアンテナ共用器の構成と同様であり、同一の符号を付ける。
以下、実施の形態4におけるアンテナ共用器について、図面を用いて説明する。図7は、実施の形態4のアンテナ共用器における電気機械結合係数減少化手段が施された共振器31を示す。尚、特に説明しない限り、実施の形態4のアンテナ共用器の構成は他の実施の形態のアンテナ共用器の構成と同様であり、同一の符号を付ける。
以下、実施の形態5におけるアンテナ共用器について、図面を用いて説明する。図8は、実施の形態5のアンテナ共用器における電気機械結合係数減少化手段が施された共振器34を示す。尚、特に説明しない限り、実施の形態5のアンテナ共用器の構成は他の実施の形態のアンテナ共用器の構成と同様であり、同一の符号を付ける。
以下、実施の形態6におけるアンテナ共用器について、図面を用いて説明する。図9は、実施の形態6のアンテナ共用器における電気機械結合係数減少化手段が施された共振器35を示す。尚、特に説明しない限り、実施の形態6のアンテナ共用器の構成は他の実施の形態のアンテナ共用器の構成と同様であり、同一の符号を付ける。
以下、実施の形態7におけるアンテナ共用器について、図面を用いて説明する。図10は、実施の形態7のアンテナ共用器における電気機械結合係数減少化手段が施された共振器36を示す。尚、特に説明しない限り、実施の形態7のアンテナ共用器の構成は他の実施の形態のアンテナ共用器の構成と同様であり、同一の符号を付ける。
以下、実施の形態8におけるアンテナ共用器について、図面を用いて説明する。図11は、実施の形態8のアンテナ共用器における電気機械結合係数減少化手段が施された共振器37を示す。尚、特に説明しない限り、実施の形態8のアンテナ共用器の構成は他の実施の形態のアンテナ共用器の構成と同様であり、同一の符号を付ける。
以下、実施の形態9におけるアンテナ共用器について、図面を用いて説明する。図12は、実施の形態9のアンテナ共用器における電気機械結合係数減少化手段が施された共振器38を示す。尚、特に説明しない限り、実施の形態9のアンテナ共用器の構成は他の実施の形態のアンテナ共用器の構成と同様であり、同一の符号を付ける。
以下、実施の形態10におけるアンテナ共用器について説明する。尚、特に説明しない限り、実施の形態10のアンテナ共用器の構成は他の実施の形態のアンテナ共用器の構成と同様である。
2 アンテナ端子
3 第1フィルタ
4 第2フィルタ
5 入力端子
6 第1直列共振器
7 第2直列共振器
8 第3直列共振器
9 第4直列共振器
10 第5直列共振器
11 第1並列共振器
12 第2並列共振器
13 第3並列共振器
14 第6直列共振器
15 第1多重モード弾性波フィルタ
16 第2多重モード弾性波フィルタ
17 第3多重モード弾性波フィルタ
18,19 出力端子
20,23,26,28,31,34,35,36,37,38 共振器
21,25,27,29,32 IDT
21a,21b,27a,27b 櫛歯型電極
121a,121b,121c,121d,129a,129b,129c 電極指
22,33 反射器
39 容量
Claims (14)
- 第1周波数帯域の信号を通過させる第1フィルタと前記第1周波数帯域より高い第2周波数帯域の信号を通過させる第2フィルタとを有するアンテナ共用器であって、
前記第1フィルタは、第1直列共振器及び前記第1直列共振器の反共振周波数より高い反共振周波数を有する第2直列共振器を含むラダー型フィルタを備え、
前記第1直列共振器の電気機械結合係数は、前記第2直列共振器の電気機械結合係数より小さいアンテナ共用器。 - 前記第1直列共振器は、前記第1フィルタの直列共振器のうち最も反共振周波数が小さい請求項1に記載のアンテナ共用器。
- 前記第1直列共振器は、前記第1フィルタの直列共振器のうち最も静電容量が大きい請求項1に記載のアンテナ共用器。
- 前記第1直列共振器には、電気機械結合係数減少化手段が施されると共に、
前記第2直列共振器には、前記電気機械結合係数減少化手段が施されていない請求項1に記載のアンテナ共用器。 - 前記第1フィルタは送信フィルタであり、
前記第1直列共振器は、前記第1フィルタの直列共振器のうち、前記第1フィルタの入力端子に最も近い共振器である請求項1に記載のアンテナ共用器。 - 前記第1直列共振器は、中央から端方向に向かうに従って交差幅が段階的に小さくなるようにアポタイズ重み付けが施されたIDTを有する請求項1に記載のアンテナ共用器。
- 前記第1直列共振器は、部分的に入出力電極指が交差しない間引き重み付けが施されたIDTを有する請求項1に記載のアンテナ共用器。
- 前記第1直列共振器は、部分的に交差幅が他の部分と比較して小さい重み付けが施されたIDTを有する請求項1に記載のアンテナ共用器。
- 前記第1直列共振器は、互いに並列に接続された複数のIDTを有すると共に前記複数のIDT間には反射器が形成された構成である請求項1、請求項4、請求項5、請求項6、請求項7のいずれか1つに記載のアンテナ共用器。
- 前記複数のIDTの両端にも反射器が形成された請求項9に記載のアンテナ共用器。
- 前記第1直列共振器は、前記IDTの両端に反射器を配した複数の共振器を互いに並列接続した構成である請求項6、請求項7、請求項8のいずれか1つに記載のアンテナ共用器。
- 前記第1直列共振器は、前記IDTの両端に反射器を配した共振器にチップ上に形成した容量を並列接続した構成である請求項1に記載のアンテナ共用器。
- 前記第1フィルタは、複数の並列共振器を含み、
前記複数の並列共振器の内、少なくとも最も反共振周波数が低い並列共振器は、IDTとこのIDTの両端に形成された反射器を有し、
この反射器の少なくとも一部の領域が前記IDTに近い側から遠い側に向かうに従ってピッチが広くなる構成である請求項1に記載のアンテナ共用器。 - 前記並列共振器が前記第1直列共振器と隣合わせに接続された請求項13に記載のアンテナ共用器。
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