CN1144421A - Filter device and dual-band radio system in which filter device is used - Google Patents
Filter device and dual-band radio system in which filter device is used Download PDFInfo
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- CN1144421A CN1144421A CN96104227A CN96104227A CN1144421A CN 1144421 A CN1144421 A CN 1144421A CN 96104227 A CN96104227 A CN 96104227A CN 96104227 A CN96104227 A CN 96104227A CN 1144421 A CN1144421 A CN 1144421A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
-
- 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
- H03H9/05—Holders; Supports
- H03H9/0538—Constructional combinations of supports or holders with electromechanical or other electronic elements
- H03H9/0566—Constructional combinations of supports or holders with electromechanical or other electronic elements for duplexers
- H03H9/0576—Constructional combinations of supports or holders with electromechanical or other electronic elements for duplexers including surface acoustic wave [SAW] devices
-
- 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
- H03H9/70—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
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H2240/00—Indexing scheme relating to filter banks
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H2250/00—Indexing scheme relating to dual- or multi-band 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
- H03H9/02—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
- H03H9/1455—Transducers of particular shape or position constituted of N parallel or series transducers
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- Physics & Mathematics (AREA)
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- Computer Networks & Wireless Communication (AREA)
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- Networks Using Active Elements (AREA)
Abstract
A filter device includes at least two filter elements provided in a package, each of the filter elements passing only signals within a predetermined frequency band, the predetermined frequency bands of the filter elements having center frequencies which are distinct from each other. An input terminal is connected to and shared by respective inputs of the filter elements. An output terminal is connected to and shared by respective outputs of the filter elements.
Description
In general, the present invention relates to a kind of filter apparatus, more specifically, relate to be suitable in two-band, to send and the filter apparatus of the dual-band radio system of received signal.
Small-sized, lightweight mobile terminal system has become widely such as automatic telephone or portable telephone and to have used.In recent years like this number of users of system increased and required the channel quantity of movable termination system utilization also will increase.In order to satisfy this demand, used than the mobile terminal system of before wideer radio-frequency band and developed for actual use.Particularly, early stage mobile terminal system only utilizes near the frequency range the 800MHz, and the new mobile terminal system of frequency range uses in practice near the 1.5GHz and utilize.
More particularly, early stage mobile terminal system uses the transmit frequency range of 940～960MHz and the receive frequency range of 810～830MHz.New 1.5GHz system uses the transmit frequency range of 1.429～1.453GHz and the receive frequency range of 1.477～1.501GHz.
Fig. 1 represents a kind of wireless signal part of wireless system of prior art.This system is transmitt or receive signal in the single frequency band of 800MHz or 1.5GHz.Hereinafter, a kind of like this mobile terminal system will be called the one-segment system.
With reference to Fig. 1, the wireless signal of this wireless system partly comprises antenna 11, antenna diplexer 2, radio signal transmitter (TX) unit 3 and wireless signal receiver (RX) unit 4.In the one-segment system, as shown in Figure 1, modulator (not shown) unit is connected to the input of TX unit 3 and the output of RX unit 4 is connected to the demodulator unit (not shown).
Radio signal transmitter (TX) unit 3 receives the signal that sends at filter 5 from modulator unit.Filter 5 is only by the signal in the frequency range of center.The transmission signal that power amplifier (PA) 6 amplifies from filter 5.Filter 7 is only by the signal in the frequency range of center.The signal that TX unit 3 sends from filter 7 output is to antenna diplexer 2, so that this signal is sent through antenna 11.
Wireless signal receiver (RX) unit 4 receives the signal of a reception from antenna diplexer at filter 8.Filter 8 is only by the signal in the frequency range of center.The received signal that low noise amplifier (LNA) 9 amplifies from filter 8.Filter 10 is only by the signal in the frequency range of center.RX unit 4 will output to demodulator unit from the received signal of filter 10.
Have the one-segment system that is similar to above-described mobile terminal system structure, is used for the one-segment system of 800MHz frequency range and is used for 1.5GHz and developed and dropped into actual the use respectively.The system of 800MHz can not use signal in the 1.5GHz frequency range and 1.5GHz system can not use signal in the 800MHz frequency range.
If a kind of wireless system that can utilize the two-band of 800MHz and two frequency ranges of 1.5GHz is provided, be useful then to the user.It is that the artificially is selected that this dual-band radio system can use one of signal in one of 800MHz and 1.5GHz frequency range and these two frequency ranges.In order to constitute above-mentioned dual-band radio system, some elements can be public for 800MHz frequency range and 1.5GHz frequency range.But the other element can not be public and must be prepared separately for dual-band radio system.
For example, under the situation of the wireless system of Fig. 1, for above-mentioned dual-band radio system, power amplifier 6 and low noise amplifier 9 can be public.Yet for filter 5,7,8 and 10, the one group of filter that is used for the 800MHz frequency range must be prepared respectively with the one group of filter that is used for the 1.5GHz frequency range, to constitute above-mentioned dual-band radio system.
An object of the present invention is to provide a kind of novelty and useful filter apparatus, be used for the wireless signal part of dual-band radio system, wherein above-described variety of issue all has been eliminated.
Another purpose of the present invention provides a high performance filter device, and this device can constitute wireless signal part reliable, small-sized, lightweight dual-band radio system.
A further object of the present invention provides a kind of dual-band radio system, and wherein reliable, small-sized, lightweight wireless signal partly constitutes by adding this filter apparatus therein.
Above-mentioned purpose of the present invention realizes by a filter apparatus, this device comprises an assembly, at least two filter elements are set in assembly, each element is only by the signal in predetermined band, the predetermined band of each filter element has the centre frequency that differs from one another, input be connected to the input separately of each filter element and by it shared and output, be connected to the output separately of each filter element and shared by them.
Above-mentioned purpose of the present invention realizes by a wireless system, this system comprises: a radio signal transmitter unit, this cell processing is in the modulated signal of the input of this radio signal transmitter unit, produce the wireless signal that sends at its output, the wireless signal of this transmission is sent to an outside station; A wireless signal receiver unit, this cell processing produce the wireless signal that receives at the signal of the input of this wireless signal receiver unit at its output; A demodulator unit, the signal that carries out demodulation generation demodulation at the output of this demodulator unit from the reception wireless signal of the wireless signal receiver unit of the input of the unit of this demodulation; A baseband signal processor unit, output in this baseband signal processor unit passes through base band signal process from the audio signal of the input of this base band signal process and produces the signal of having handled, the output of this baseband signal processor unit is connected to the input of modulator unit, this signal processor unit has other output, on this output, produce audio signal through the base unit weight signal processing from other input in this baseband signal processor unit, other input of this baseband signal processor unit is connected to the output of demodulator unit, each data transmitter unit and receiver unit comprise at least one filter apparatus, and the filter apparatus of each data transmitter unit and receiver unit comprises: a package assembling; Be arranged at least two filter elements in this assembly, only by the signal in the predetermined frequency band, the predetermined band of filter element has the centre frequency that differs from one another to each element; Input is connected to the input separately of filter element and shared by it; Be connected to the output separately of filter element and shared with output by it.
Filter apparatus in one aspect of the invention comprises: a hard-cover assembly, at least two filtration device elements that are arranged in this assembly, have the centre frequency of different predetermined bands, be connected to and by the fan-in of its each shared filter element be connected to and be its shared output of output of each filter element.Therefore, may provide a kind of high performance filter device, it allows to constitute a wireless signal part reliable, small-sized, lightweight dual-band radio system.In addition, may provide a kind of dual-band radio system, wherein a kind of reliable, small-sized, lightweight wireless signal partly constitutes by adding this filter filter device therein.
Filter apparatus in another aspect of the present invention, comprise a phase matched unit between the input that is arranged on this input and each filter element, and be arranged on a phase matched unit between the output of this output and each filter element.Therefore, may obtain the band-pass filtering property of the expectation of each filter element by utilizing these phase matched unit.
From read following detailed in conjunction with each accompanying drawing after, above-mentioned and other purpose, characteristics and advantage of the present invention will become clearer.Wherein:
Fig. 1 is the wireless signal block diagram partly of the wireless system of prior art;
Fig. 2 is a kind of block diagram of wireless signal part of wireless system, comprises the filter apparatus of one embodiment of the present of invention in this system;
Fig. 3 is the block diagram of an embodiment of the wireless signal filter apparatus partly in Fig. 2;
Fig. 4 A is to be the circuit diagram of the filter element of the filter apparatus among Fig. 3 with 4B;
Fig. 5 A and 5B are the perspective views of the filter element among Fig. 4 A and the 4B;
Fig. 6 is the enlarged drawing of electromigration figure of the series resonator of one of filter element among Fig. 5 A and the 5B;
Fig. 7 A and 7B are used for the filter element of key diagram 4A and 4B and the Smith chart of reflection characteristic;
Fig. 8 is the block diagram of another embodiment of filter apparatus, and one of them phase matched unit is included in the wireless signal part of Fig. 2;
Fig. 9 A and 9B are the cutaway view and the perspective views of the filter apparatus among the embodiment of Fig. 8;
Figure 10 A and 10B are cutaway view and the perspective views of another embodiment of the filter apparatus different with the embodiment of Fig. 8;
Figure 11 A and 11B are the cutaway view and the perspective views of another embodiment of filter apparatus that is different from the embodiment of Fig. 8;
Figure 12 is the block diagram of another embodiment of the filter apparatus among Fig. 2;
Figure 13 is the figure of another embodiment of the filter element of filter apparatus of the present invention;
Figure 14 is the block diagram with dual-band radio system of wireless signal part, comprising the filter apparatus of one embodiment of the invention.
With reference to each accompanying drawing the preferred embodiments of the present invention are made description below.
Fig. 2 represents the wireless signal part of a dual-band radio system, comprising at least two filter apparatus of one embodiment of the present of invention.In Fig. 2, the same with Fig. 1 corresponding component parts are represented by identical label, will omit the narration of these parts.
With reference to Fig. 2, wireless signal partly comprises: antenna 11, antenna diplexer 2, radio signal senders (TX) unit 13 and wireless signal receiver (RX) unit 14.In dual-band radio system shown in Figure 2, a modulating unit (end illustrates) is connected to the input of TX unit 13 and the output of RX unit 14 is connected to a demodulator unit (not shown).
Above-mentioned dual-band radio system sends and is received in the 800MHZ frequency range and any signal in the 1.5GHZ frequency range.In the present embodiment, select to be used for 800MHZ frequency range and two of the 1.5GHZ frequency range desirable antennas of different antennas and the wireless signal part that is installed to Fig. 2.Another scheme, above-mentioned two antennas and a converting unit (not shown) can be installed to the wireless signal part and selectively be connected to dual-band radio system by a desirable antenna that utilizes two antennas of this converting unit.
Radio signal transmitter (TX) unit 13 comprise have an output be connected to power amplifier (PA) 6 input filter apparatus 15 and have the filter apparatus 17 that its input is connected to the output of PA 6.
Wireless signal receiver (RX) unit 14 comprises that output is connected to the filter apparatus 18 of input of low noise amplifier (LNA) 9 and the filter apparatus 20 of the output that input is connected to LNA 9.
Above-mentioned filter apparatus 15,17,18 and 20 is to stop the band pass filter of all signals except the signal in a predetermined band.These unit are parts of the encapsulation of producing dividually.Therefore, the number of elements in the wireless signal of Fig. 2 part is identical with number of elements in the wireless signal part of representing in Fig. 1.
Each above-mentioned filter apparatus 15,17,18 and 20 comprises that two filter elements and this filter element have the centre frequency " f that differs from one another
1" and " f
2" two predetermined bands.
For example, " f
1" be the centre frequency and the " f of 800MHZ frequency range
2" be the centre frequency of 1.5GHZ frequency range.In the present embodiment, all signals all signals the signal of one of this filter element prevention in the 800GHZ frequency range that comprises centre frequency " f1 " and the signal of other filter elements prevention in the 1.5GHZ frequency range that comprises centre frequency " f2 ".
Fig. 3 represents the filter apparatus 15,17,18 and one of 20 of the wireless signal part of Fig. 2 in the present embodiment.Be illustrated among Fig. 2 filter apparatus 15,17,18 with 20 be illustrated in Fig. 3 in filter apparatus have identical structure.
With reference to Fig. 3, this filter apparatus comprises first filter element 21 and second filter element 22.First filter element 21 has the predetermined band of a centre frequency " f1 " and the frequency range in advance that second filter element 22 has a centre frequency " f2 ".
Filter apparatus in the present embodiment (or one of the filter apparatus among Fig. 2 15,17,18 and 20) is that the unit of an encapsulation of production separately and the unit of this encapsulation are to be represented by the dotted line among Fig. 3.
Filter apparatus among Fig. 3 has four terminal T1, T2, T3 and T4.Therefore, this filter apparatus is called four terminals, two-band filter apparatus.Terminal T1 and T2 are the input terminals of this filter apparatus, be connected to first and second filter elements 21 and 22 input and by its institute shared.Terminal T3 and T4 are the lead-out terminals of this filter apparatus, be connected to first and second filter elements 21 and 22 output and by its institute shared.In addition, in this filter apparatus, terminal T2 and T4 are ground connection.
When the signal in the 800MHZ frequency range was input to the input terminal T1 of the filter apparatus among Fig. 3, only filter element 21 transmitted this signal and exports this signal to lead-out terminal T3.When the signal in the 1.5GHZ frequency range was input to the input terminal T1 of the filter apparatus among Fig. 3, only filter element 22 transmitted this signal and exports this signal to output T3.Therefore, the filter apparatus among Fig. 3 plays the effect of two-band filter apparatus.
SAW filter element among Fig. 4 has the SAW resonator Rp (in Fig. 4 A by (a) expression) of the input t1 that is parallel-connected to the SAW filter element and a parallel connection on the t2 and has the lead-out terminal t3 that is parallel-connected to the SAW filter element and the SAW resonator Rp of the parallel connection of t4 (in Fig. 4 A by (e) expression).
SAW filter element among Fig. 4 B has the series connection SAW resonator Rs of the input terminal t11 that is connected in series to the SAW filter element and have the series connection SAW resonator Rs (being represented by (g)) of the lead-out terminal t13 that is connected in series to SAW in Fig. 4 B.
In the SAW of Fig. 4 A and 4B filter element, the resonator Rs of the SAW resonator Rp of one group of parallel connection and one group of series connection is pectination electricity post pattern arrangement on piezoelectric crystal plate in interdigital mode.This piezoelectric crystal plate is for example by the lithium tantalate made.Pectination shape electricity post is for example made by 2% aluminium, copper metal material.
Fig. 5 A is the perspective view of first filter element 21 of Fig. 4 A and the perspective view of second filter element 22 that Fig. 5 B is Fig. 4 B.
With reference to Fig. 5 A, filter element 21 is that utilization is arranged in the SAW resonator Rp of the parallel connection on the piezoelectric crystal plate 24 and the SAW resonator Rs of series connection constitutes.These resonators are that the comb electrode figure of arranging in interdigital mode on piezoelectric crystal plate 24 provides.Electrode is to be made by 2% aluminium, copper metal material.Piezoelectric crystal plate 24 thickness are 0.35mm and by the lithium tantalate made.Resonator by (a) to (e) expression in Fig. 5 A is identical to (e) with the corresponding resonator of representing in Fig. 4 A (a).In addition, the terminal in Fig. 5 A (t1) to (t4) is identical to (t4) with the respective terminal of representing in Fig. 4 A (t1).
The series connection SAW resonator R of the filter element among Fig. 6 presentation graphs 5A and the 5B
sOne of electrode pattern.Connect that the SAW resonator comprises a central electrode 25 and at two reflecting electrodes 26 of central electrode both sides with reference to Fig. 6.Similarly, SAW resonator R in parallel
pCentral electrode of tool and at two reflecting electrodes of central electrode both sides.Just not saying series connection SAW resonator, SAW resonator R in parallel
pA reflecting electrode be ground connection.SAW resonator R in parallel
pThe figure of reflecting electrode be different from series connection SAW resonator R
sThe reflecting electrode figure.
With reference to Fig. 5 B, filter element 22 is to utilize the SAW resonator R in parallel that is arranged on the piezoelectric crystal plate 24
pWith series connection SAW resonator R
sConstitute.These resonators are to provide with the electrode that interdigital mode is arranged in the comb figure on the piezoelectric crystal plate 24.Electrode is made by 2% aluminium and copper metal material.Piezoelectric crystal plate 24 is by the lithium tantalate made.Resonator by Fig. 5 B (f) to (j) expression is identical to (j) with the corresponding resonator (f) of presentation graphs 4B.In addition, the terminal (T among Fig. 5 B
11) to (T
14) be be illustrated in Fig. 4 B in corresponding terminal identical.
Knownly there are some electrode parameters that relate to the reflection characteristic of resonator.For the details of the electrode parameter of the design problem that relates to filter element, province is omitted in its description.
Fig. 7 A is the Smith's pie diagram that is illustrated in the reflection characteristic of the filter element 21 among Fig. 4 A and the 5A.Fig. 7 B is the Smith's pie diagram that is illustrated in the reflection characteristic of the filter element among Fig. 4 B and the 5B.
Shown in Fig. 7 A, when signal at " f
1" when frequency is interior usually, have parallel resonator R at input and output
pFilter element 21 as for example about 50 Ω of impedance component.When signal at " f
2" frequency passband (f
1＜f
2) when interior, filter element 21 has high impedance.
On the contrary, shown in Fig. 7 B, when signal at " f
2" when frequency passband is interior, have series resonator R at input and output
sFilter element 22 as impedance component (for example, about 50 Ω).When signal at " f
1" when frequency passband was interior, filter element 22 had high impedance.
In the filter apparatus of the embodiment of Fig. 3 (filter apparatus 15,17,18 and 20 any one), filter element 21 and filter element 22 are connected in parallel.In this filter apparatus, filter element 21 has low band connection frequency (f
1) and filter element 22 have high band connection frequency (f
2).Therefore, filter element in Fig. 4 A and 5A 21 and the filter element in Fig. 4 B and 5B 22 have good pass-band performance.
As mentioned above, the filter apparatus among Fig. 3 is the unit of an encapsulation being connected in parallel of filter element 21 and 22 wherein.Join the wireless signal part of dual-band radio system by filter apparatus, may constitute the wireless signal part of small-sized, lightweight, a highly reliable dual-band radio system present embodiment.
But, in order to obtain the pass-band performance of better filter element 21 and 22, need use a phase matched unit for the filter apparatus of Fig. 3.The effect of this phase matched unit is at (the f that makes the filter cell 21 of coupling in Fig. 4 A and 5A on the higher direction of impedance
2) phase place (right phase place rotation) of frequency passband.The effect of this phase matched unit is to make the wave-wave device unit 22 " fs of coupling in Fig. 4 B and 5B on the higher direction of impedance
1" the phase place (left phase place rotation) of frequency passband.
From Smith's pie diagram of Fig. 7 A and 7B, readily appreciate that, if constitute a filter apparatus, the filter element 21 that wherein has Fig. 4 B structure is connected in parallel with the filter element 22 with Fig. 4 A structure, and it is very difficult then carrying out above-mentioned phase matched.
Fig. 8 represents another embodiment of the device of filtering, and one of them phase matched unit is included in the wireless signal filter apparatus partly of Fig. 2.
With reference to Fig. 8, filter apparatus 30 also is included in the phase matched unit within its encapsulation except that the filter element 21 and 22 of the filter apparatus in Fig. 3.
The filter apparatus 30 of present embodiment is included in transmission line 31, capacitor C 1 and the inductance L 1 on the input of filter element 21 and 22 and is included in transmission line 32, capacitor C 2 and inductance L 2 on the output of filter element 21 and 22.These elements of filter apparatus 30 play a part above-described phase matched unit.One end of transmission line 31 is connected to the input that input terminal T1 and its other end are connected to filter element 21.Output and its other end that one end of transmission line 32 is connected to filter element 21 are connected to lead-out terminal T3.Inductance L 1 and capacitor C 1 are arranged between the input of input terminal T1 and filter element 22.Inductance L 2 and capacitor C 2 are arranged between the output and lead-out terminal T3 of filter element 22.
Filter apparatus 30 among Fig. 8 has above-mentioned phase matched unit.The effect of this phase matched unit is at " the f that makes matched filter element 21 on the higher direction of impedance
2" frequency passband phase place and at " the f that makes matched filter element 22 on the higher direction of impedance
1" phase place of frequency passband.Therefore, under the situation of the filter apparatus 30 of Fig. 8, can getable filter element 21 and 22 better pass-band performance.
Fig. 9 A and 9B are illustrated in the filter apparatus among the embodiment of Fig. 8.With reference to Fig. 9 A and 9B, this filter apparatus has and comprises a laminated piece 40 and at the assembly of the lid 42 at the top of this laminated piece 40.Lid 42 is made by metal material.Under another situation, this laminated piece 40 can be called assembly.
Laminated piece 40 in the present embodiment is to form with the conductive layer alternative stacked with line pattern with the insulating barrier such as ceramic material (for example, aluminium oxide).In laminated piece 40, the figure of conductive layer can be connected to each other on electric by the hole (comprising electric conductor in each hole) of the exhausted layer of each edge.
In the filter apparatus of Fig. 9 A and 9B, transmission line 31 and 32 is that the figure of the conductive layer of utilization in laminated piece 40 forms and transmission line 31 and 32 is used as the phase matched unit.Transmission line 31 and 32 is to utilize the hole of insulating barrier according to such connection shown in Figure 8.
Shown in Fig. 9 A, laminated piece 40 has recessed portion, comprising filter element 21 and 22.The terminal T of a plurality of pedestals and filter element 21 is set on the intermediate step of recessed portion
1To T
4And the terminal T of filter element 22
11To T
14Utilize the connecting line 43 of aluminum to be connected on each pedestal.Each pedestal utilizes terminal T
1To T
4Electrically be connected on the figure of each conductive layer in the laminated piece 40 with the hole of insulating barrier.
Capacitor C 1 is provided with L2 with C2 and inductance L 1 and is illustrated among Fig. 9 A and the 9B, but they are arranged in the appropriate location of the recessed portion of laminated piece 40.Therefore, the filter among Fig. 8 30 is that hole, the pedestal in the laminated piece 40, electric capacity and the inductance that utilizes insulating barrier constitutes.
The recessed portion utilization lid 42 of laminated piece 40 seals airtightly.The terminal T of the filter apparatus in Fig. 9 A and 9B
1To T
4The bottom of assembly that is arranged at filter apparatus is to the side.
Figure 10 A and 10B represent to be different from another embodiment of filter apparatus of the embodiment of Fig. 8.With reference to Figure 10 A and 10B, filter apparatus has and comprises laminated piece 50 and at an assembly of the lid 42 of the bottom of laminated piece 50.
Laminated piece 50 in the present embodiment is to form like this, so that the insulating barrier of ceramic material (for example aluminium oxide) and the conductive layer alternating layer lamination with wire pattern.In laminated piece 50, the figure of each conductive layer can couple together on electric mutually by the hole (comprising conductor in each hole) of insulating barrier.
Figure 10 A filter apparatus in, laminated piece 50 comprises top layer 51 and as shown in the 10B, forms transmission line 31 and 32 at the top surface of top layer 51.Shown in Figure 10 A, at the lower surface formation filter element 21 and 22 of top layer 51.
Shown in Figure 10 A, laminated piece 50 has recessed portion, comprises filter element 21 and 22 therein.The hermetic sealing of recessed portion utilization lid 42 of this laminated piece 50.A plurality of pedestals are arranged on the intermediate step of concave portion and the terminal T of filter element 21
1To T
4Terminal T with filter element 22
11To T
14Utilize lead 43 to be connected on the pedestal.Each pedestal utilizes terminal T
1To T
4Be connected on the figure of conductive layer of laminated piece 40 with hole on the insulating barrier.
In Figure 10 A, expression comprises interconnected input terminal T
1, lead-out terminal T
3Hole 52 with the conductor of an internal electrically conductive layer.Capacitor C 1 and C2 and inductance L
1And L
2Be not shown among Figure 10 A or the 10B, but they can be arranged on recessed portion 20 appropriate locations of laminated piece 50.
Figure 11 A and 11B represent to be different from another embodiment of filter apparatus of the embodiment of Fig. 8.
With reference to Figure 11 A and 11B, filter apparatus has a laminated piece 55, comprises the top layer 56 of the topmost that is positioned at 55 layers of this laminated pieces.Shown in Figure 11 B, transmission line 31 and 32, electric close C
1And C
2, and inductance L
1And L
2All be arranged in the top surface of this top layer 56.Capacitor C
1And C
2And inductance L
1And L
2Be arranged at the top surface of top layer 56, but be different from the arrangement of those elements of the filter apparatus shown in Figure 10 A and the 10B.
In other structures of the filter apparatus of the embodiment of Figure 11 A and 11B is the same with the structure of the filter apparatus of Figure 10 A and 10B.
Because in the filter apparatus of the embodiment of Figure 11 A and 11B, inductance L
1And L
2And capacitor C
1And C
2Be arranged in the top of laminated piece 55, after this filter apparatus encapsulation, these elements still can be mounted or change.
Figure 12 represents to be different from another embodiment of the filter apparatus of the former embodiment that is illustrated in Fig. 8.With reference to Figure 12, the filter apparatus 60 of this embodiment comprises filter element 21 and 22 and transmission line 31 and 32.In this embodiment, be used as the capacitor C of phase matched unit
1And C
2And inductance L
1And L
2, with different the linking to each other with filter apparatus 60 of filter apparatus of the embodiment of Fig. 8 from the outside.
In order to make inductance L
1And L
2And capacitor C
1And C
2Can connect from the outside, the assembly of this filter apparatus 60 is except terminal T
1, T
2, T
3And T
4Also comprise input terminal T outward,
5With lead-out terminal T
6Capacitor C
1An end be connected to input terminal T
5And input terminal T
5Be connected to an input of filter element 22.Capacitor C
1The other end be connected to input terminal T
1On.In addition, capacitor C
2An end be connected to lead-out terminal T
6And lead-out terminal T
6Be connected to filter element 22 and an output.Capacitor C
2The other end be connected to lead-out terminal T
3Therefore, may be by revising and the filter apparatus 60 outside inductance C that are connected
1And C
2And electric capacity L
1And L
2Carry out the phase matched of filter element 22.
The filter apparatus of the above embodiments utilizes ladder type surface acoustic wave (SAW) filter element.In addition, filter apparatus of the present invention can utilize the multi-electrode SAW filter element that is called as lateral type SAW filter element.
Figure 13 is illustrated in the multi-electrode SAW filter element among the another one embodiment of filter apparatus of the present invention.With reference to Figure 13, this multi-electrode SAW filter element is to form on the piezoelectric crystal plate 65 by the lithium tantalate made.As shown in figure 13, many electrodes of this filter element are formed on the piezoelectric crystal plate 65.
Use the size of the two-band filter apparatus of above-mentioned multi-electrode SAW filter element can be more much smaller than the size of the filter apparatus that uses the delectric filter element.In addition, utilize the size Billy of two-band filter apparatus of ladder type SAW filter element much smaller with the size of the filter apparatus of delectric filter element.
Figure 14 represents to comprise the dual-band radio system of a wireless signal part, comprises the filter apparatus in one embodiment of the present of invention in this part.In Figure 14, the similar elements of above having described is denoted by the same reference numerals and the description that contrasts it will be omitted.
With reference to Figure 14, this dual-band radio system comprises baseband signal processor 71, modulator unit 72, adder unit 73, radio signal transmitter (TX) unit 13, antenna diplexer 2, antenna 11, wireless signal receiver (RX) unit 14, mixer unit 74, demodulator unit 75, has phase-locked ring (PLL) circuit 76, microphone unit M and the loudspeaker unit SP of local oscillator 77.The power pack of this dual-band radio system is provided with such as the battery unit of above-mentioned dual-band radio system power supply and is illustrated among Figure 14.
Baseband signal processor 71 produces signal " I " and " Q " that has handled from audio signal of microphone M input with by base band signal process at its output.Modulator unit 72 input produces modulated signal from the signal of having handled " I " of baseband signal processor 71 and " Q " with by the quadrature amplitude phase modulated under the speed of exporting from the frequency of oscillation of PLL circuit 76 at its output.
Adder unit 73 input produces a composite signal from two modulated signals of modulator unit 72 and the addition by processed signal at its output.13 inputs of radio signal transmitter (TX) unit produce a transmission signal from the composite signal of adder unit 73 with at its output.TX unit 73 comprises above-mentioned filter apparatus of the present invention.
The wireless signal that wireless signal receiver (RX) unit 14 receives from antenna diplexer 2.Mixer unit 74 inputs produce a down-conversion signal from the wireless signal of the reception of RX unit 14 with at its output.Demodulator unit 75 input produces signal " I " and " Q " that has reconciled from the down-conversion signal of mixer unit 74 with by with the demodulation from the speed of the frequency of oscillation of local oscillator 77 outputs at its output.
Baseband signal processor 71 input from the demodulated signal " I " of demodulator unit 75 and " Q " and by base band signal process in audio signal of its output generation.Loud speaker SP is according to the audio signal work by baseband signal processor 71 outputs.
In above-mentioned dual-band radio system, a switch SW is connected baseband signal processor 71.By the artificially switch SW is set, can selects to be used for the 800MHZ frequency range of operation of dual-band radio system and a desirable frequency range of 1.5GHZ frequency range.The result of the artificial setting of switch SW carries out according to the selection 1 of one of 800MHz frequency range and 1.5GHz frequency range from the conversion of frequency of oscillation that baseband signal processor 71 is sent to PLL circuit 76 and local oscillator 77 and is used for the operation of dual-band radio system.
Above-mentioned filter apparatus of the present invention is applied in the dual-band radio system with structure as shown in figure 14.Yet filter apparatus of the present invention not only can be applied in the wireless system of present embodiment, but also can be applied in the wireless system with another structure.In addition, the passband of the applied wireless system of the present invention is not limited to 800MHZ and 1.5GHZ.Filter apparatus of the present invention with the assembly that comprises three or more filter elements also may be provided.
Claims (12)
1. a filter apparatus comprises:
A package assembling;
Two filter elements (21,22) are set in described package assembling at least, and only by the signal in the predetermined band, the described predetermined band of described at least two filter elements has the centre frequency (f that differs from one another to each described filter element
1, f
2);
An input (T
1), be connected to the input separately of described at least two filter elements and share by them; With
An output (T
3), be connected to the output separately of described at least two filter elements and share by them.
2. according to the filter apparatus of claim 1, it is characterized in that described filter apparatus also comprises:
Be arranged on the first phase matched unit between the input of described input and described at least two filter elements (31, C
1, L
1); With
Be arranged on the second phase matched unit between the output of described output and described at least two filter elements (32, C
2, L
2).
3. according to the filter apparatus of claim 2, it is characterized in that the described first phase matched unit comprises to be connected to input (T
1) and be connected to first transmission line (31), the first inductance (L of one of described at least two filter elements (21)
1) and the first electric capacity (C
1), described first inductance and described first electric capacity are connected to input (T
1) and be connected to another filter elements (22) of described at least two filter elements and the described second phase matched unit and comprise and be connected to output (T
3) and be connected to second transmission line (32) of the described filter element one (21) of described at least two filter elements, the second inductance (L
2) and the second electric capacity (C
2), described second inductance and described second electric capacity are connected to output (T
3) and be connected to another filters (22) of described at least two filter elements.
4. according to the filter apparatus of claim 1, it is characterized in that described at least two filter elements (21,22) comprise surface acoustic wave filter elements.
5. according to the filter element of claim 1, it is characterized in that described at least two filter elements (21,22) are made of surface acoustic wave filter elements, a plurality of SAW (Surface Acoustic Wave) resonator that the trapezoidal form that each surface acoustic wave filter elements comprises is arranged, described surface acoustic wave filter elements comprises:
Constitute the first surface acoustic wave filter element (21) of one of described at least two filter elements, have the input (T that is arranged in described first surface acoustic wave filter element
1, T
2) and be arranged in the output (T of described first surface acoustic wave filter element
3, T
4) parallel resonator ((a), (e); With
Constitute the second table acoustic wave filter element (22) of another wave filter element of described at least two filter elements, have the input (T that is arranged in described second surface acoustic wave filter element
11) and be arranged in the output (T of second surface acoustic wave filter element
13) series resonator ((f), (i).
6. according to the filter apparatus of claim 5, it is characterized in that described first surface acoustic wave filter element (21), have a centre frequency (f1), it is lower than the centre frequency (f2) of described second surface acoustic wave filter (22).
7. according to the filter apparatus of claim 1, it is characterized in that described assembly comprises:
Have the conductive layer of alternative stacked and the laminated piece of insulating barrier (40,50,55), described laminated piece comprises recessed portion; With
A lid (42), its described at least two filter element of sealing (21,22) is in the recessed portion of described laminated piece.
8. according to the filter apparatus of claim 3, it is characterized in that described assembly comprises a laminated piece (40,50,55), it is to constitute on one of conductive layer of described laminated piece that described laminated piece has the conductive layer of alternative stacked and insulating barrier and described first transmission line (31) and described second transmission line (32).
9. according to the filter apparatus of claim 3, it is characterized in that described first transmission line (31) and described second transmission line (32) are configured in an outer surface of described assembly.
10. according to the filter apparatus of claim 3, it is characterized in that described first transmission line (31) and described second transmission line (32) are configured on the outer surface of described assembly and described at least two filter elements (21,22) are configured in the described outer surface of described assembly.
11., it is characterized in that described filter apparatus also comprises according to the filter apparatus of claim 1:
Be arranged on the first phase matched unit (31) between one of described input (T1) and described at least two filter elements (21);
Be arranged on the described filter element (21) of described at least two filter elements and the second phase matched unit (32) between the described output (T3);
Be connected to the first terminal (T5) of input of another filter element (22) of described at least two filter elements, described the first terminal is used for through the outside input that connects another phase matched unit (C1, L1) to described another filter element (22) of described two filter elements of described the first terminal at least; With
Be connected to described another filter element (22) of described at least two filter elements and second terminal (T6) of output, described second terminal is used for connecting the output of another phase matched unit (C2, L2) to described another filter element (22) of described at least two filter elements through described second terminal outer.
12. a wireless system comprises:
Radio signal transmitter unit (13) in the modulated signal of output processing at the input of this radio signal transmitter unit, produces the wireless signal that sends, and the wireless signal of described transmission is sent to the station of an outside;
A wireless signal receiver unit (14) at the signal of output processing at the input of this wireless signal receiver unit, produces the wireless signal that receives;
A modulator unit (72) produces modulated signal by modulation from the processed signal of the input of this modulator unit at the output of this modulator unit;
A demodulator unit (75) produces restituted signal by demodulation from the wireless signal of the reception of the wireless signal receiver unit that the input of this demodulator unit is brought at the output of this demodulator unit;
A baseband signal processor unit (71), at the output of this baseband signal processor unit by to base band signal process from audio signal at the input of this baseband signal processor unit, produce the signal of handling, the output of described baseband signal processor unit is connected to the output of modulator unit, described signal processor unit has another output, the restituted signal of bringing in from other input of this baseband signal processor unit in this output audio signal produces through base band signal process, and described other input of described baseband signal processor unit is connected to the output of demodulator unit;
It is characterized in that each described data transmitter unit and described receiver unit comprise at least one filter apparatus (15,17,18,20), described at least one filter apparatus comprises: a package assembling;
At least two filter elements (21,22) are arranged in the described package assembling, and only by the signal in the predetermined band, the predetermined band of described at least two filter elements has the centre frequency that differs from one another to each described filter element;
Be connected to the input separately of described at least two filter elements and by they shared inputs (T1); With
Be connected to the output separately of described at least two filter elements and by they shared outputs.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP216126/95 | 1995-08-24 | ||
| JP21612695 | 1995-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1144421A true CN1144421A (en) | 1997-03-05 |
Family
ID=16683672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96104227A Pending CN1144421A (en) | 1995-08-24 | 1996-03-04 | Filter device and dual-band radio system in which filter device is used |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1144421A (en) |
| DE (1) | DE19607500A1 (en) |
| TW (1) | TW325607B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397782C (en) * | 2001-11-26 | 2008-06-25 | 富士通媒体器件株式会社 | Duplexer and electronic equipment using the same duplexer |
| CN103490745A (en) * | 2012-06-12 | 2014-01-01 | 太阳诱电株式会社 | Filter module and duplexer module |
| CN103490745B (en) * | 2012-06-12 | 2016-11-30 | 太阳诱电株式会社 | Filter module and duplexer module |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09121138A (en) * | 1995-08-24 | 1997-05-06 | Fujitsu Ltd | Filter device and radio equipment using the same |
| JP3244032B2 (en) | 1997-08-22 | 2002-01-07 | 株式会社村田製作所 | Surface acoustic wave device |
| JPH11127052A (en) * | 1997-10-24 | 1999-05-11 | Murata Mfg Co Ltd | Composite filter and radio equipment using it |
| JP3403669B2 (en) * | 1999-06-04 | 2003-05-06 | 富士通株式会社 | Antenna duplexer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2021547A6 (en) * | 1990-06-06 | 1991-11-01 | Reolid Lopez Ricardo | Band pass and elimination filter network for electric signals. |
| DE4132907A1 (en) * | 1991-10-04 | 1993-04-08 | Thomson Brandt Gmbh | FILTER ARRANGEMENT |
-
1996
- 1996-02-10 TW TW085101682A patent/TW325607B/en active
- 1996-02-29 DE DE19607500A patent/DE19607500A1/en not_active Ceased
- 1996-03-04 CN CN96104227A patent/CN1144421A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397782C (en) * | 2001-11-26 | 2008-06-25 | 富士通媒体器件株式会社 | Duplexer and electronic equipment using the same duplexer |
| CN103490745A (en) * | 2012-06-12 | 2014-01-01 | 太阳诱电株式会社 | Filter module and duplexer module |
| CN103490745B (en) * | 2012-06-12 | 2016-11-30 | 太阳诱电株式会社 | Filter module and duplexer module |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19607500A1 (en) | 1997-02-27 |
| TW325607B (en) | 1998-01-21 |
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| C06 | Publication | ||
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |