CN1716769A - Spring surface acoustic wave apparatus and communications equipment - Google Patents
Spring surface acoustic wave apparatus and communications equipment Download PDFInfo
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- CN1716769A CN1716769A CN 200510079165 CN200510079165A CN1716769A CN 1716769 A CN1716769 A CN 1716769A CN 200510079165 CN200510079165 CN 200510079165 CN 200510079165 A CN200510079165 A CN 200510079165A CN 1716769 A CN1716769 A CN 1716769A
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Abstract
An IDT electrode (2) and an electrode pad (3) are formed at a primary face at one side of a piezoelectricity base plate (1), and an annular electrode (4) surrounding the IDT electrode (2) and the electrode pad (3) is formed. The annular electrode (4) is connected with a heat dissipation conductor (15) formed under a circuit base plate (11) through a through conductor (14) formed inside the circuit base plate (11), thus, heat produced by the IDT electrode (2) can be easily released to the outside by the annular electrode (4), the through conductor (14) and the heat dissipation conductor (15), which inhibits the bad influence caused by the heat and accordingly can improve the power withstanding performance of an elastic surface wave device.
Description
Technical field
The present invention relates to a kind of elastic surface wave (Surface Acoustic Wave, hereinafter to be referred as making SAW) device, particularly relate to a kind of transmission reception frequency divider employed surface acoustic wave apparatus such as (duplexers) that is required small-sized and anti-high-power communicator.
Background technology
In recent years, acoustic surface wave filter is widely used in the various communicators.
Acoustic surface wave filter has precipitous filter characteristic, and advantage such as production is superior, and therefore, it is specially adapted to mobile communications device.
Particularly, constitute the filter of the duplexer of mobile communications device inside, also use acoustic surface wave filter to replace from the dielectric filter of use always in the past.
But, by the signal after being amplified by power amplifier, therefore when communication, be loaded the high power of 0.8～1.2W in the duplexer.
If load high power for IDT (the Inter Digital Transducer) electrode of acoustic surface wave filter, then can produce a large amount of heat at the IDT electrode, this heat makes the migration of electrode material quicken, and therefore causes the anti-power deficiency of IDT electrode.
Therefore, because anti-power deficiency in the employed always acoustic surface wave filter in the past, therefore very wish to improve the anti-power of surface wave filter.
In addition,, not only need high anti-powerization, also wish to realize miniaturization for duplexer.
In the past, generally in the recess of ceramic package, acoustic surface wave element is installed, after by the wire bonds technology portion of terminal of the pad electrode of acoustic surface wave element and ceramic packaging being coupled together, wait this recess hermetic seal is got up by block, by making acoustic surface wave filter like this, also be so-called packaged type acoustic surface wave filter.
Relative therewith, in recent years for further miniaturization, actively use CSP (Chip SizePackeage) technology, the acoustic surface wave element upside-down mounting is installed on the circuit substrate, promptly so-called CSP type acoustic surface wave filter is known.By like this, can will be used for the needed space of wire bonds method in the former encapsulated type or highly reduce.
But, if adopt the CSP type, because a side that is formed with the IDT electrode with piezoelectric substrate, install towards the circuit substrate upside-down mounting, therefore, consequently, there is not good this problem points of anti-power this point in the heat radiation countermeasure that very difficult enforcement is used for being produced because of the loading high power in the IDT electrode heat leaves.
This be because, in the CSP type surface acoustic wave apparatus, can't only through the small conductor convex of the area of section,, be difficult to guarantee the route that effectively dispels the heat from the installed surface side of the acoustic surface wave element of piezoelectric substrate to the heat radiation of circuit substrate side.
Summary of the invention
The objective of the invention is to, a kind of CSP type surface acoustic wave apparatus of small-sized and anti-power excellence is provided.
Surface acoustic wave apparatus of the present invention, the IDT electrode that have piezoelectric substrate, includes and the filter element of electrode pad, and be used for forming the circuit substrate of the relative installation of face (being called interarea) with the above-mentioned filter element of above-mentioned piezoelectric substrate, in above-mentioned interarea, be formed with the ring electrode that surrounds above-mentioned filter element; In the face of the above-mentioned piezoelectric substrate of installation of foregoing circuit substrate, be formed with the sealing ring-shaped conductor that is connected with above-mentioned ring electrode; With the opposite face of face of the above-mentioned piezoelectric substrate of installation of foregoing circuit substrate, or in any inner layer surface of foregoing circuit substrate, be provided with heat dissipation conductor; Be provided with the locational perforation conductor that is connected, in the foregoing circuit substrate, penetrates into always above-mentioned heat dissipation conductor with above-mentioned sealing with ring-shaped conductor.
According to this surface acoustic wave apparatus, by the heat that the IDT electrode of filter element is produced, can be diffused in the ring electrode that surrounds this IDT electrode and form, simultaneously, can allow the heat of this ring electrode pass to heat dissipation conductor, dispel the heat from heat dissipation conductor through connecting conductor.
Therefore, even CSP type surface acoustic wave apparatus, the heat that is produced in the IDT electrode of acoustic surface wave element also can be dispelled the heat efficiently, consequently, can suppress the generation of the migration (migration) in the IDT electrode, a kind of surface acoustic wave apparatus of anti-power excellence is provided.
As optimal way, ring-shaped conductor, above-mentioned perforation conductor or above-mentioned heat dissipation conductor ground connection are used in above-mentioned sealing.Because above-mentioned sealing forms with ring-shaped conductor, above-mentioned perforation conductor or above-mentioned heat dissipation conductor filter element is surrounded,, just can obtain the effect of magnetic shielding filter element if therefore allow its ground connection.Therefore, can reduce and be arranged on miscellaneous part in the communicator or the electromagnetic interference between other elements.
If above-mentioned ring electrode is cubic frame shape, its any or all limits, be connected with above-mentioned perforation conductor, just can by beeline the IDT electrode be coupled together with ring electrode (conductor that is connected this IDT electrode and ring electrode is called " conductor fig "), therefore can dispel the heat more efficiently.
If it is a plurality of that above-mentioned filter element is formed with in 1 piezoelectric substrate, above-mentioned ring electrode is surrounded above-mentioned a plurality of filters respectively, ring electrode just can play the effect to the electromagnetic shielding of each filter, therefore, can eliminate the electromagnetic coupled between each filter, the interference between the rejects trap.
Above-mentioned a plurality of filter element for example constitutes with filter element by sending with filter element and reception.
Especially, use under the situation of filter with filter and reception in the transmission that constitutes duplexer, be leaked to receiver side sometimes by power amplifier institute amplified transmission signal, if such leakage has taken place, will produce the signal that must receive originally and hinder, therefore, must avoid interference between the filter.Therefore, these a plurality of filters be send with filter with receive when using filter, this surface acoustic wave apparatus can be used as duplexer well.
In addition, at above-mentioned a plurality of filters for example is that GSM (800MHz frequency band) uses filter and DCS (1.9GHz frequency band) when using filter, this surface acoustic wave apparatus, compare with the situation that two filters are respectively formed on the different piezoelectric substrates, miniaturization more, and can dwindle erection space in circuit substrate, be very desirable therefore.
When between the ring electrode that surrounds above-mentioned filter element, engaging, under the differentiated situation of caloric value in a plurality of filters, the filter that caloric value is many, can use the perforation conductor that connects the ring electrode that surrounds self and surround the ring electrode both sides of the few filter of caloric value, dispel the heat, a side can realize that thermal diffusivity better constructs.In addition, compare with asynthetic situation between a plurality of ring electrodes, by engaging the area that is provided with that can dwindle ring electrode, therefore can be with the surface acoustic wave apparatus miniaturization.In addition, each filter has suppressed the interference between the filter also by electromagnetic shielding in this case.
In addition, when the varying in size of the ring electrode that surrounds a plurality of filter elements respectively, by making the ring electrode of the many filters of encirclement caloric value bigger, can around the many filters of caloric value, more perforation conductors be set, so can dispel the heat to the circuit substrate side effectively.
In above-mentioned IDT electrode at least 1, when resistive element is electrically connected with above-mentioned ring electrode, the heat that the IDT electrode is produced, can reject heat in the ring electrode through resistive element, and owing to can allow the high-frequency signal of IDT electrode can not reveal, therefore, can not give the IDT characteristic of electrode and bring influence, and dispel the heat well by the characteristic of the filter that it constituted.
If the both sides at the elastic surface wave direction of transfer of IDT electrode are provided with reflector, and above-mentioned reflector is connected with above-mentioned ring electrode, then be transfused to the heat radiation route of the IDT electrode of high power signals and heating, be not only connecting portions such as conductor convex, can also guarantee to have the reflector of the both sides of the elastic surface wave direction of transfer that is arranged on the IDT electrode, therefore, compared, can reduce the temperature of acoustic surface wave element effectively with the former element that only dispels the heat from connecting portion.
So, owing to can prevent that the IDT electrode temperature from uprising, so the frequency characteristic of acoustic surface wave element can significantly not change because of variations in temperature yet.So the anti-power of surface acoustic wave apparatus of the present invention is outstanding, frequency characteristic is stable, is the high device of a kind of reliability.
In the above-described configuration, when sealing was grounding electrode with ring electrode, owing to reflector is connected with grounding electrode, so the reflection efficiency of elastic surface wave was very high, in that acoustic surface wave element is used as under the situation of filter, can improve by being with overseas attenuation.
In addition, communicator of the present invention, the surface acoustic wave apparatus of the present invention with above-mentioned formation has at least 1 in transtation mission circuit and the receiving circuit simultaneously.By using acoustic surface wave element small-sized and that reliability is high, even under the situation of using big high power signals, also can obtain desired filter characteristic very reliably.
Above-mentioned or other advantages, feature and effect of the present invention, the explanation of the execution mode that is undertaken by following contrast accompanying drawing can be clearer and more definite.
Description of drawings
Fig. 1 is the vertical view of the interarea of the piezoelectric substrate of expression formation surface acoustic wave apparatus of the present invention.
Fig. 2 is the vertical view of the upper surface of the circuit substrate of the above-mentioned piezoelectric substrate of expression installation.
Fig. 3 is a surface acoustic wave apparatus of the present invention along the cutaway view of the B-B ' line of the A-A ' line of Fig. 1 and Fig. 2.
Fig. 4 surrounds the vertical view of the interarea of the piezoelectric substrate that the ring electrode of filter element engages one another for expression.
Fig. 5 is the vertical view of the interarea of the big or small mutually different piezoelectric substrate of the ring electrode of expression encirclement filter element.
Fig. 6 is the vertical view of the upper surface of the circuit substrate of the above-mentioned piezoelectric substrate of expression installation.
The vertical view of the interarea of the piezoelectric substrate that Fig. 7 is electrically connected with ring electrode through resistive element for expression IDT electrode.
The vertical view of the interarea of the piezoelectric substrate that Fig. 8 is connected with ring electrode through connecting line for the expression reflector.
Fig. 9 is the curve chart of the frequency dependence of the transmission characteristic of the input signal in the explanation surface acoustic wave apparatus of the present invention.
The vertical view of the interarea of the piezoelectric substrate that Figure 10 has increased for the area of the connecting line that is connected with ring electrode of expression reflector.
Embodiment
Contrast accompanying drawing below, surface acoustic wave apparatus of the present invention is elaborated.
Fig. 1 is the vertical view of the interarea of the piezoelectric substrate of expression surface acoustic wave apparatus, Fig. 2 is the vertical view of the upper surface of the circuit substrate of the above-mentioned piezoelectric substrate of expression installation, Fig. 3 represents the surface acoustic wave apparatus of the present invention that acoustic surface wave element is installed on the circuit substrate to be constituted, and is the cutaway view along the B-B ' line of the A-A ' line of Fig. 1 and Fig. 2.
What this execution mode was represented is to use two ladder shape acoustic surface wave elements to constitute the example of duplexer.
Surface acoustic wave apparatus will be as formed of the IDT electrode (being called " interarea ") of the exciting electrode that is used for producing elastic surface wave, with mounted thereto in opposite directions of circuit substrate 11.
Among Fig. 1,1 is piezoelectric electrode, and 2 is formed a plurality of IDT electrodes in the interarea of piezoelectric substrate 1, and 3 is the electrode pad as input and output terminal that is electrically connected with above-mentioned IDT electrode 2.4 for surrounding the ring electrode that above-mentioned a plurality of IDT electrode 2 and a plurality of electrode pad 3 form.Constitute acoustic surface wave element by them.
Acoustic surface wave element is formed with two, constitutes respectively to send to use filter 5 and receive with filter 6.In addition, forming encirclement transmission respectively uses filter 5 and receives the ring electrode 4 of using filter 6.In addition, in this execution mode, ring electrode 4 forms four jiaos of frame shapes.Constitute the IDT electrode 2 that sends with filter 5 and be transfused to high power, at work heating.
In addition, except input and output with after electrode pad 3 and the ring electrode 4, can IDT electrode 2 be covered by diaphragm (not shown) etc.In this case; diaphragm is used for preventing the oxidation of IDT electrode 2 grades; improve moisture-proof; simultaneously; prevent foreign matter etc. adhere between caused each electrode and each electrode in short circuit; and adjust frequency, after above-mentioned electrode forms, form by film forming methods such as CVD method or vapour deposition methods.Adopt SiO2 film, Si3N4 film, Si film etc.
Among Fig. 2,11 is circuit substrate, 12 for being formed on the perforation corresponding to electrode pad 3 (via) conductor in the circuit substrate 11,13 sealing ring-shaped conductors on circuit substrate 11, forming corresponding to above-mentioned ring electrode 4, the 14 perforation conductors that form corresponding to above-mentioned ring electrode 4 for inside at circuit substrate 11,15 for the following of the circuit substrate 11 that forms with connect the heat dissipation conductor that conductor 14 is connected.In addition, this heat dissipation conductor 15 sometimes also is formed on the inside of circuit substrate 11.
Connect conductor 14 and be used for sealing is connected with heat dissipation conductor 15 with ring-shaped conductor 13, carry out good heat radiation.This connects the configuration of conductor 14, near the many IDT electrodes 2 of caloric value, with parallel resonance son with the wiring figure that couples together and the intersection point part of ring electrode 4, perhaps under the reflector of the IDT electrode 2 that caloric value is many and the situation that ring electrode 4 is electrically connected, near this connecting portion place, the heat radiation route is shorter, and radiating effect increases, and is very desirable therefore.
In addition, ring electrode 4 with four jiaos of frame shapes be formed on piezoelectric substrate 1 around, therefore, can utilize the bigger area of its inboard, IDT electrode 2 and electrode pad 3 are set effectively.
In addition, thickness about through electrode 14, if to heat radiation, then diameter is better, if but too thick, then as the pottery of the insulating material of circuit substrate 11, and just become big because of the caused stress of coefficient of thermal expansion differences between the made perforation conductor 14 of metal, sometimes can near the insulating barrier the perforation conductor 14, produce crackings such as slight crack, cause the low of connection reliability.Therefore, the diameter that connects conductor 14 here is preferably in about 50～200 μ m.
The inside of circuit substrate 11 or following formed heat dissipation conductor 15, be connected with the electronic circuit of outside, with surface acoustic wave apparatus ground connection, simultaneously, has the function that the heat that action produced along with IDT electrode 2 is rejected heat to well the outside of surface acoustic wave apparatus.
Such heat dissipation conductor 15, in order to allow the heat that IDT electrode 2 produced loose in the electronic circuit of outside effectively, preferably be positioned at can by minimal path with seal the position that is connected with ring-shaped conductor 13 on.Also promptly, preferably heat dissipation conductor 15 and sealing are coupled together with ring-shaped conductor 13 straight lines by connecting conductor 14.
In addition, therefore the major avenues of approach in the electronic circuit of outside because the heat that on the heat dissipation conductor 15 IDT electrode 2 is produced is loose, as the heat dissipation conductor 15 of this contact-making surface, is preferably in the scope of designing institute operation and makes it bigger.
By like this, the heat that IDT electrode 2 is produced, through ring electrode 4 diffusions, simultaneously, can from the sealing that is connected with this ring electrode 14 with ring-shaped conductor 13, connect conductor 14 to heat dissipation conductor 15 heat outputs, dispel the heat from heat dissipation conductor 15.
Therefore, even CSP type surface acoustic wave apparatus, the heat that is produced in the IDT electrode 2 of this acoustic surface wave element also can be dispelled the heat well, consequently, can suppress the generation of the migration in the IDT electrode 2, a kind of surface acoustic wave apparatus of anti-power excellence is provided.
Each electrode pad 3 of piezoelectric substrate 1, conductor convex via annular seal layer 22 formation, be connected with connecting conductor 12 with each the top input and output that are formed on circuit substrate 11, simultaneously, ring electrode 4 and on circuit substrate 11 corresponding to the 4 formed sealings of this ring electrode with between ring-shaped conductors 13, use for example cured material such as scolding tin, thereby be connected at inboard annular seal.
By like this, can guarantee given space in the action face side of acoustic surface wave element, and keep the gas tightness in this space, so can suppress the influence of external environment condition, allow the acoustic surface wave element steady operation, simultaneously, can long-term stability carry out this work, thereby can form the surface acoustic wave apparatus of high reliability.By in above-mentioned hermetic seal space, further enclose nitrogen of inert gas for example etc., can prevent effectively that each IDT electrode 2 or each electrode are overlapping 3, each input and output are with the caused deteriorations such as oxidation that connect conductor 12, thereby can realize further high reliability.
In addition, even give piezoelectric substrate 1 external force action, this power is also born with ring-shaped conductor 13 by ring electrode 4 and sealing, can prevent from the action of IDT electrode 2 is brought harmful effect, thereby a kind of surface acoustic wave apparatus of reliability excellence can be provided.
In addition, as described in this execution mode,, constitute to send and use filter 5 and receive with filter 6 by a plurality of IDT electrodes 2 and a plurality of electrode pads 4.Afterwards, ring electrode 4 forms these transmissions is surrounded respectively with filter 6 with filter 5 and reception.By this structure, ring electrode 4 can play the effect to the electromagnetic shielding of each filter 5,6, therefore, can allow each filter 5,6 electromagnetic coupled can not take place, thus the interference between can supression filter 5,6.
Next, the constituent material to above-mentioned surface acoustic wave apparatus describes.
The logarithm that the electrode of IDT electrode 2 refers to is 50～200, the width that electrode refers to is 0.1～10.0 μ m, electrode refers to is spaced apart 0.1～10 μ m, the intersection width that electrode refers to is 10～80 μ m, the thickness of IDT electrode 2 is 0.2～0.4 μ m, by like this, can access desired characteristic as resonator or filter, be very desirable.
Among Fig. 3,21 is the sealing resin that the acoustic surface wave element of being installed on the circuit substrate 11 is sealed.Sealing resin 21 by epoxy resin or biphenyl resin, polyimide resin, be mixed with aluminium or fillers such as aluminium nitride or silicon nitride and constituted as the resin of the filler of solid constituent.Sealing resin 21 has the function of the outer dress protective material that is used as the influence of protecting the acoustic surface wave element that is installed on the circuit substrate 11 not to be subjected to external environment condition or external force.In this example, from another interarea of piezoelectric substrate 1 (Fig. 3 above) span to circuit substrate 11 above, formed the profile of surface acoustic wave apparatus.Like this; the top piezoelectric substrate of the installing 1 sealed resin 21 of circuit substrate 11 seals; by like this, can protect piezoelectric substrate 1 and electrical connection section not to be subjected to the influence of mechanical shock and moisture, medicine etc., thereby can access a kind of surface acoustic wave apparatus of high reliability.
In the circuit substrate 11, is representative with ring-shaped conductor 13 and input and output with connecting conductor 12, connecting conductor 14, heat dissipation conductor 15 etc. with sealing, form the conductor fig of desired figure or connect conductor fig, wait and form and make by metallic conductors such as Au, Cu, Ag, Ag-Pd, W being implemented one-tenth embrane method such as silk screen printing or evaporation, spin coating and etched combination.Each conductor fig or each connect conductor fig, if desired and bonding better between the acoustic surface wave element, preferably implement the plated film of Ni or Au etc. from the teeth outwards.
Next, another execution mode of having represented surface acoustic wave apparatus of the present invention among Fig. 4.
Fig. 4 is the vertical view of the interarea of the piezoelectric substrate of expression acoustic surface wave element.Give the part mark identical symbol identical among Fig. 4 with Fig. 1.
In this example, surround transmission respectively and connect together mutually with filter 5 and the ring electrode 4 that receives with filter 6.
According to such structure, compare with above-mentioned execution mode, have same thermal diffusivity, can allow the further miniaturization of acoustic surface wave element and surface acoustic wave apparatus.
Next, another execution mode of having represented surface acoustic wave apparatus of the present invention among Fig. 5, Fig. 6.
Fig. 5 is the vertical view of the interarea of the expression acoustic surface wave element identical with Fig. 1.Fig. 6 is the top vertical view of the circuit substrate of expression installation this piezoelectric substrate identical with Fig. 2.
In Fig. 5 and Fig. 6, give the part mark identical symbol identical with Fig. 1, Fig. 2.
In this example, the transmission of surrounding respectively as a plurality of filters connects together mutually with filter 5 and the ring electrode 4 that receives with filter 6, and simultaneously, it varies in size.Send with filter 5 with receive with filter 6, surround by two annulus that vary in size of same ring electrode 4 respectively.In this example, surround the size (inboard area) that sends with the annulus of filter 5, than surrounding the size big (extensively) that receives with the annulus of filter 6.
According to this formation, can the IDT electrode 2 of high-power transmission with filter 5 will be loaded directly, be designed to large electrode, simultaneously, can the sizable transmission of caloric value with filter 5 around more perforation conductor 14 is set, be connected with ring electrode 4, therefore, can suppress the maximization of surface acoustic wave apparatus, and improve anti-power.
Next, Fig. 7 is the vertical view of the interarea of the piezoelectric substrate of the expression acoustic surface wave element identical with Fig. 1.Give the part mark identical symbol identical among Fig. 7 with Fig. 1.
In this example, transmission as a plurality of filters is surrounded respectively by ring electrode 4 with filter 6 with filter 5 and reception, simultaneously, the part that is connected with discord ring electrode 4 direct-connected holding wires in each IDT electrode 2 is electrically connected with ring electrode 4 through resistive element 7.This resistive element 7 can form by the semiconductor of for example high impedance such as silicon or tantalum oxide, cupric oxide.In addition, can also form by film resistors such as tantalum nitrides.
This resistive element 7 is a high impedance to the high-frequency signal that inputs in the IDT electrode 2, and therefore, high-frequency signal can not be leaked in the ring electrode 4 through this resistive element 7.In addition, be Low ESR to direct current, therefore become conducting state, play from the effect of IDT electrode 2 to the heat release route of ring electrode 4, therefore, the hot more effective heat radiation that is produced in the IDT electrode 2 can be allowed, thereby the anti-power of surface acoustic wave apparatus can be further improved.
This resistive element 7, can with a plurality of IDT electrodes 2 at least 1 be connected, specifically, can be connected with the IDT electrode 2 of discord ring electrode 4 direct-connected caloric value maximums.In addition, both can be connected with IDT electrode 2 through holding wire as shown in this example, can directly be connected with the busbar of IDT electrode 2 again.
Next, another execution mode to surface acoustic wave apparatus of the present invention describes.
Fig. 8 is the vertical view of the interarea of the piezoelectric substrate of the expression acoustic surface wave element identical with Fig. 1.Also give the part mark identical symbol identical among Fig. 7 with Fig. 1.
Among Fig. 8,3a is earthy pad electrode, and 9 is reflector, and 10 for constituting the cloth line electrode of holding wire, and 16 is the connecting line of reflector 9 and ring electrode 4.
As shown in Figure 8, the both sides at the direction of transfer of the elastic surface wave of each IDT electrode 2 are provided with reflector 9.This reflector 9 is connected with ring electrode 4 by connecting line 16.
By both sides at the direction of transfer of the elastic surface wave of IDT electrode 2 like this reflector 9 is set, this reflector 9 is connected with ring electrode 4 by connecting line 16, can guarantee that from the heat radiation route of the IDT electrode 2s of importing high-power signal and generating heat the reflector 9 of the both sides through being arranged on IDT electrode 2 arrives ring electrode 4.
Therefore, and only compare, can reduce the temperature of acoustic surface wave element effectively from the situation of input/output pads electrode 3 or earthy pad electrode 3a heat radiation.Consequently, the anti-power of acoustic surface wave element is superior, becomes the high acoustic surface wave element of a kind of reliability.
In addition, form in the operation at the figure that carries out IDT electrode 2, reflector 9, connecting line 16 and ring electrode 4, if allow reflector 9 be connected through connecting line 16, then have the advantage that does not need new connection member and do not need complicated step with ring electrode 4.
In addition, as shown in Figure 8, input and output with pad electrode 3 be arranged on IDT electrode 2 near, under the state that the made pseudo-pad electrode (not shown) discord IDT electrode 2 of high thermoconductivity materials such as Pt, Cu, Au, Al is connected, be arranged on IDT electrode 2 near.By like this, can increase the area of the outside heat radiation route of the IDT electrode that generates heat 2, further improve the thermal diffusivity of acoustic surface wave element, become the high element of a kind of reliability.
Above-mentioned pseudo-pad electrode can form arbitrary shapes such as polygon, ellipse by figure, under the state that discord IDT electrode 2 is electrically connected, be arranged on IDT electrode 2 near.Pseudo-pad electrode can form after IDT electrode 2 forms again, also can use and IDT electrode 2 identical materials when forming IDT electrode 2, forms in same operation.
In addition, when ring electrode 4 ground connection, reflector 9 is ground connection also, therefore can further improve the reflection efficiency of elastic surface wave.This mechanism is at present also indeterminate, is speculated as the mechanism of the following stated.Also promptly, produced less electric field in the past in reflector 9, and therefore can produce phase deviation when the reflection elastic surface wave, consequently, standing wave is decayed because of interference, and reflection coefficient decays to also lower than design load.But, by allowing reflector 9 be connected, will eliminate the electric field effects that is produced in the reflector 9, the interference between the standing wave that is produced in elastic surface wave in can inhibitory reflex device 9 and the reflector 9 with grounding electrode.Therefore, the reflection coefficient height is to the reflection efficiency height of elastic surface wave.So,, can increase by being with overseas attenuation by increasing antiresonance (anti-resonance) resistance value in the elastic surface acoustic wave resonator.
Fig. 9 is used as surface acoustic wave apparatus of the present invention under the situation of filter the curve chart of the frequency dependence of the transmission characteristic of input signal for explanation.Transverse axis is represented frequency (MHz) among the figure, and the attenuation (attenuation) that the longitudinal axis is represented input signal (dB).Solid line represent ring electrode 4 as grounding electrode and with situation that reflector 9 is connected under transmission characteristic, dotted line is represented the transmission characteristic under the situation that the ring electrode 4 of reflector 9 discord ground connection is connected.
As shown in Figure 9, can confirm,, can increase by being with overseas attenuation by allowing reflector 9 be connected with the ring electrode 4 of ground connection.
As mentioned above, be transfused to the radiating circuit of the IDT electrode 2 of high-power signal and heating, not merely be the conductor convex of perforation conductor 12 of pad electrode 3,3a and circuit substrate 11 that connects the piezoelectric substrate 1 of upside-down mounting, the large tracts of land route via reflector 9, ring electrode 4 and the sealing usefulness ring-shaped conductor 13 of the both sides of the direction of transfer of the elastic surface wave that is arranged on IDT electrode 2 can also be set.Therefore, can reduce the temperature of acoustic surface wave element more effectively, anti-power excellence consequently, can access a kind of small-sized and surface acoustic wave apparatus that reliability is high.
Figure 10 is the vertical view of another execution mode of expression surface acoustic wave apparatus of the present invention.
Among Figure 10, compare connecting line 16 wider width that are connected with ring electrode 4 with the acoustic surface wave element of Fig. 8.Therefore, be transfused to high-power signal and the area of the heat radiation route of the IDT electrode 2 that generates heat becomes big, the heat that can be produced IDT electrode 2 is more effectively dispelled the heat, thereby can access the high acoustic surface wave element of a kind of reliability.
Next, communicator of the present invention has the receiving circuit of the surface acoustic wave apparatus of the invention described above of being provided with at least, and is provided with in the transtation mission circuit of surface acoustic wave apparatus of the invention described above any.
By in surface acoustic wave apparatus of the present invention, assembling inductance, capacitor etc., can access band pass filter, this band pass filter is separately positioned in receiving circuit and the transtation mission circuit, receive switching device shifter connection receiving circuit and transtation mission circuit by sending, by like this, can access communicator of the present invention.
According to communicator of the present invention, by adopting small-sized and anti-power excellence and the high acoustic surface wave element of reliability, even, also can access desired filter characteristic small-sized and use under the situation of high-power signal.
In addition, the present invention is not limited in above execution mode, can carry out various changes in the scope of the main points of the present invention that do not come off.For example, in the example of above-mentioned execution mode, the electrode pad 3 of piezoelectric substrate 1 and the input and output of circuit substrate 11 are connected with the end that connects conductor 12, but also can be on circuit substrate 11 formation corresponding to the electrode pad of electrode pad 3 and coupled.
In addition, in the circuit substrate 11,, the match circuit that tortuous phase place circuit or inductance and electric capacity are constituted can be set for sending with filter 5 and receiving with insulation well between the filter 6.By like this,, can prevent to send signal and flow in the receiving filter 6, so insulation characterisitic is fine at the reception of antenna end impedance operator approach infinity in transmission frequency band territory with filter 6.
Next, the embodiment to surface acoustic wave apparatus of the present invention describes.
＜embodiment 1 〉
Piezoelectric substrate uses 38.7 ° of Y to cut the monocrystalline lithium tantalate structure base board that directions X transmits, on the one side interarea, be formed with the figure of the made IDT electrode 2 of the Al alloy of Al (accounting for 99% quality)-Cu (accounting for 1% quality), with figure as the electrode pad of input and output electrode, and the figure and the ring electrode of the wiring that they are electrically connected.These graphic makings are as described below, after sputtering method formation Al alloy firm, carry out photoetching by stepping exposure device and spin coating device and developing apparatus etc., afterwards, carry out etching by RIE (reactive ion etching) device etc., be shaped by carrying out each given figure like this.
At first, by acetone, IPA organic solvents such as (isopropyl alcohol),, organic principle is cleaned the ultrasonic waves for cleaning of carrying out as the lithium tantalate wafer of piezoelectric substrate.Next, by clean baking oven substrate is carried out carrying out the formation of IDT electrode, electrode pad, wiring and ring electrode after the intensive drying.
During these form, use sputter equipment to form after the Al-Cu film of above-mentioned composition, the photoresist of thick about 0.5 μ m in the spin coating carries out the formation of each desired figure by the stepping exposure device.Next, in developing apparatus, dissolve the photoresist of unwanted part, reveal each desired figure, afterwards by alkaline developer, carry out the etching of Al-Cu film by the RLE device, form desired IDT electrode, electrode pad, wiring and ring electrode.
Afterwards, form their diaphragm of protection.Here; form silicon oxide film by sputter equipment; afterwards; the figure that carries out photoresist by the photoresist method forms; by RIE device etc. carry out corresponding to the input and output electrode of electrode pad with peristome with corresponding to the etching of the ring electrode of ring electrode with peristome, form the diaphragm figure.
Next, make film forming that a part of opening figure on the resistive element of connection ID T electrode and ring electrode in the diaphragm, by the RIE device this part diaphragm is carried out after the etching, by making resistive element from formulation by the photoresist method.This resistive element uses the silicon that is added with boron, carries out film forming by sputtering method.
In addition, be independently resistive element to be carried out figure to form here, but also can by this film the IDT electrode be electrically connected with ring electrode forming diaphragm self by semiconductive thin films such as silicon.In this case, can omit again figure and form the operation of making resistive element.
In addition; when etching IDT electrode; can be between IDT electrode and ring electrode residual extremely thin Al-Cu film; after the diaphragm production process that carries out of CVD (vapour deposition of the chemistry) method of passing through to use the resist stripping process of oxygen plasma or use oxygen plasma in; by with residual Al-Cu film oxidation; form high ohmic semiconductor CuAlO2, used as resistive element.
In addition, here the Al-Cu film by individual layer forms the IDT electrode, but also can be with it as basilar memebrane, be arranged on the basalises such as Ti or Cu, use at basalis under the situation of Ti or Cu, can use same processing, with residual Ti or Cu oxide thin layer, by forming high resistance semiconductors such as titanium oxide or cupric oxide like this, therefore, also can be used as resistive element.
Next, along line of cut cutting piezoelectric substrate, the chip of each acoustic surface wave element is separated.Afterwards, by solder ball with the input and output on the electrode pad of chip and ring electrode, the circuit substrate with connecting after conductor and sealing load onto temporarily with ring-shaped conductor, through the Reflow Soldering operation it is joined together respectively, obtains the acoustic surface wave filter that the hermetic seal of IDT electrode is got up.
Here, make circuit substrate by a plurality of insulating barriers of lamination.In these insulating barriers, for example use, or glass ceramics that can low-firing, or be glass epoxy resin of main component etc. with the organic material with the pottery of aluminium oxide as main component.Under the situation of using pottery or glass ceramics, the tellite of making pottery etc. is provided with after desired wiring figure and the perforation conductor, these green sheet layers is overstock connect, by forming as one like this and firing and make.
About as above resulting surface acoustic wave apparatus of the present invention, under 50 ℃ ambient temperature, load in the experiment of power of 32dBm, can access than former surface acoustic wave apparatus and surpass about 3 hours anti-power life-span.
According to above result, surface acoustic wave apparatus of the present invention can discharge the heat that is produced in the IDT electrode efficiently, can be confirmed to be the outstanding device of a kind of anti-power.
＜embodiment 2 〉
Next, contrast Figure 10 describes an alternative embodiment of the invention.
On circuit substrate 11, corresponding such with pad electrode 3 and ring electrode 4 with the input and output of acoustic surface wave element, it is thick in Ag made perforation conductor 12 and sealing ring-shaped conductor 13 to form about 1 μ m.
Afterwards, connecting conductor 12 and sealing, by the scolding tin slurry that is used as conductor convex and annular seal layer 22 of the thick about 20 μ m of the pre-silk screen print method coating about 100 μ m of live width with on the ring-shaped conductor 13.
In addition, from the top of the opposite side interarea of piezoelectric substrate 1, by the made sealing resin 21 of completion method epoxy resin coating, after the acoustic surface wave element on the circuit substrate 11 covered, in drying oven 150 ℃ down heating made its sclerosis in 5 minutes.At last,, on the separation point position between each acoustic surface wave element, cut, form surface acoustic wave apparatus its separation from the inboard of circuit substrate 11.
Size by the above formed surface acoustic wave apparatus of operation is 1.6mm * 2.0mm, and height is 0.6mm.By like this, can make the surface acoustic wave apparatus that uses surface acoustic wave apparatus of the present invention.
In addition, for the thermal diffusivity to surface acoustic wave apparatus of the present invention is estimated, by using the heat analysis of Finite Element, obtain the ascending temperature of the relative room temperature in each position of the surface acoustic wave apparatus when loading large-signal power to the surface acoustic wave apparatus that uses acoustic surface wave element.
Will with the surface acoustic wave apparatus same material of the acoustic surface wave element that uses the foregoing description and the heat analysis model of surface acoustic wave apparatus same formation, that reflector 9 is connected with ring electrode 4, be made as model (a).In addition, in order to compare with the present invention, the heat analysis model of the surface acoustic wave apparatus that reflector 9 is not connected with ring electrode 4 is made as model (b).
In addition, establish the ring electrode 4 that all has periphery in two models, estimate.
If analysis condition is, the thickness of piezoelectric substrate 1 is 0.25mm, the pyroconductivity of each material (W/mk) is respectively: the piezoelectric substrate 1 that the monocrystalline lithium tantalate body is constituted is 4.1, the circuit substrate 11 that ltcc substrate constituted is 3.9, conductor convex that scolding tin constituted and annular seal layer 19 are 61, the sealing resin 21 that epoxy resin constituted is 0.5, the IDT electrode 2 that the Al-Cu alloy is constituted, input and output pad electrode 3, earthy pad electrode 4, reflector 9, extraction electrode 10, connecting line 16 and ring electrode 4 are 236, the perforation conductor that Ag constituted is 12, sealing is 150 with ring-shaped conductor 13, and the air that is sealed in the oscillation space 14 is 2.6 * 10
-2
Analytical method is, under the environment of room temperature (25 ℃), give the signal power of certain surface acoustic wave apparatus input 0.4W, simulate IDT electrode 2 and near the state that dispels the heat in the environment that in surface acoustic wave apparatus, transmits of the heat that produced, calculate IDT electrode 2 and near maximum ascending temperature thereof, and the thermal resistance ratio from IDT electrode 2 to the heat transfer process the external environment condition.Its result is as shown in table 1.
[table 1]
Table 1
| Model | The conductor convex material | Piezoelectric substrate thickness (mm) | Maximum ascending temperature (℃) | Thermal resistance is than (-) |
| (a) | Scolding tin | 0.25 | 58.0 | 0.54 |
| (b) | Scolding tin | 0.25 | 83.2 | 0.96 |
Can learn from the result shown in the table 1, IDT electrode 2 and near maximum ascending temperature, model (a) is 58.0 ℃, and model (b) is 83.2 ℃, and to the ratio of the thermal resistance the external environment condition, model (a) is 0.54 from IDT electrode 2, and model (b) is 0.96.
As implied above, compare with the model (b) of expression surface acoustic wave apparatus, expression is used in the model (a) of surface acoustic wave apparatus of surface acoustic wave apparatus of the present invention, and IDT electrode 2 and near maximum ascending temperature are lower, and the thermal resistance ratio has reduced about 60%.
Can learn that according to above result use the surface acoustic wave apparatus be arranged on this surface acoustic wave apparatus of the present invention that near the reflectors 9 the IDT electrode 2 are connected with ring electrode 4, thermal diffusivity is higher.
Therefore as mentioned above, use the surface acoustic wave apparatus thermal diffusivity excellence of surface acoustic wave apparatus of the present invention, even carrying out under the situation that flip chip installs, anti-power is also fine, consequently, can access a kind of small-sized and device that reliability is high.
Claims (10)
1. surface acoustic wave apparatus is characterized in that:
Have: include the IDT electrode on the side interarea that is formed on piezoelectric substrate and the filter element of electrode pad, and be used for circuit substrate with the relative installation of face of above-mentioned IDT electrode of being formed with of above-mentioned piezoelectric substrate and electrode pad;
In the face that is formed with above-mentioned IDT electrode and electrode pad of above-mentioned piezoelectric substrate, be formed with the ring electrode that surrounds above-mentioned filter element;
In the face of the above-mentioned piezoelectric substrate of installation of foregoing circuit substrate, be formed with the sealing ring-shaped conductor that is connected with above-mentioned ring-type substrate;
The foregoing circuit substrate with the opposite face of face that above-mentioned piezoelectric substrate is installed, or in any inner layer surface of foregoing circuit substrate, be provided with heat dissipation conductor;
Be provided with the perforation conductor, it is connected with ring-shaped conductor with above-mentioned sealing, in the foregoing circuit substrate, penetrates on the position of above-mentioned heat dissipation conductor always.
2. acoustic surface wave element as claimed in claim 1 is characterized in that:
Ring-shaped conductor, above-mentioned perforation conductor or above-mentioned heat dissipation conductor ground connection are used in above-mentioned sealing.
3. surface acoustic wave apparatus as claimed in claim 1 is characterized in that:
Above-mentioned ring electrode is cubic frame shape, its any or all limits, be connected with above-mentioned perforation conductor.
4. surface acoustic wave apparatus as claimed in claim 1 is characterized in that:
Above-mentioned filter element is formed with a plurality of in 1 piezoelectric substrate, and above-mentioned ring electrode is surrounded above-mentioned a plurality of filters respectively.
5. surface acoustic wave apparatus as claimed in claim 4 is characterized in that:
Above-mentioned a plurality of filter element constitutes with filter element by sending with filter element and reception.
6. surface acoustic wave apparatus as claimed in claim 4 is characterized in that:
Surround between the ring electrode of above-mentioned filter element and engage.
7. surface acoustic wave apparatus as claimed in claim 4 is characterized in that:
Surround the size of the ring electrode of above-mentioned filter element, different in each filter element.
8. surface acoustic wave apparatus as claimed in claim 1 is characterized in that:
In the above-mentioned IDT electrode at least 1 is electrically connected with above-mentioned ring electrode through resistive element.
9. surface acoustic wave apparatus as claimed in claim 1 is characterized in that:
In the above-mentioned piezoelectric substrate, in the both sides of the elastic surface wave direction of transfer of IDT electrode reflector is set, above-mentioned reflector is connected with above-mentioned ring electrode.
10. communicator is characterized in that:
Surface acoustic wave apparatus as claimed in claim 1 is installed, has in transtation mission circuit and the receiving circuit at least one simultaneously.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004190460 | 2004-06-28 | ||
| JP2004190460A JP4443325B2 (en) | 2004-06-28 | 2004-06-28 | Surface acoustic wave device |
| JP2004220058 | 2004-07-28 |
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| Publication Number | Publication Date |
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| CN1716769A true CN1716769A (en) | 2006-01-04 |
| CN100533970C CN100533970C (en) | 2009-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100791653A Expired - Fee Related CN100533970C (en) | 2004-06-28 | 2005-06-28 | Spring surface acoustic wave apparatus and communications equipment |
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| JP (1) | JP4443325B2 (en) |
| CN (1) | CN100533970C (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2006014096A (en) | 2006-01-12 |
| CN100533970C (en) | 2009-08-26 |
| JP4443325B2 (en) | 2010-03-31 |
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