• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An object of the present invention is to obtain a dielectric filter, a duplexer, and a communication device using them, which have both band stop filter characteristics and band pass filter characteristics. According to the present invention, the resonant line holes 4a to 4d are formed in the dielectric block 1 to have band pass filter characteristics, and an excitation line for interdigitally coupling the resonant line of the hole 4d to the hole 9 is provided. ), A resonant line interdigitally coupled to the resonant line of the hole 4d is formed in the hole 5a, and a resonant line interdigitally coupled to the excitation line of the hole 9 is formed in the hole 5b. . This constitutes a band pass filter having two traps.
    公开号:KR20000047623A
    申请号:KR1019990049931
    申请日:1999-11-11
    公开日:2000-07-25
    发明作者:타다히토시；히로시마모토하루；가토히데유키
    申请人:무라타 야스타카；가부시키가이샤 무라타 세이사쿠쇼；
    IPC主号:
    专利说明:

    Dielectric filter, duplexer and communication apparatus
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to dielectric filters, duplexers and communication devices using them in high frequency circuits.
    As a dielectric filter having a plurality of resonant lines formed in a dielectric block and having both a band pass characteristic and a band stop characteristic, Japanese Patent Laid-Open Nos. 8-32313 and ② Japanese Patent Laid-Open No. 8-330806 are disclosed. These dielectric filters have a band pass characteristic by combing a plurality of resonant lines in the dielectric block, and also form trap resonators to form attenuation poles.
    Examples of the duplexer according to the prior art are shown in Figs. 10A to 10D. 10A to 10D are projection views of the duplexer, FIG. 10A is a front view, FIG. 10B is a left side view, FIG. 10C is a right side view, and FIG. 10D is a top view.
    The duplexer is formed by forming various holes and electrodes for a rectangular parallelepiped dielectric block. That is, 2 (2a, 2b, 2c), 3, 4, (4a, 4b, 4c, 4d) and 5 are holes for resonant lines, and internal circuits are formed on these inner surfaces to form resonant lines. 7, 8 and 9 are holes for the aftershock tracks, and the aftershock lines are formed by forming inner conductors on their inner surfaces. L1, L2,... Ld is a serial number attached to the various lines for reference in the equivalent circuit that follows.
    FIG. 11 is an equivalent circuit diagram of the duplexer shown in FIGS. 10A to 10D. In Fig. 11, since Z12 acts as a phase circuit of π / 2 [rad] (hereinafter, the unit rad of the phase angle is omitted), (Z1, Z12) acts as a trap resonator. Z3, Z4 and Z5 act as comb-lined three-stage resonators in order. Z7, Z8, Z9, and Za also act as comb-lined four-stage resonators in that order. In addition, since Zbc acts as a phase circuit of / 2, (Zc, Zbc) acts as a trap resonator.
    12A and 12B are diagrams showing the passage characteristics of the duplexer. 12A shows the pass characteristic of the receive filter portion, and FIG. 12B shows the pass characteristic of the transmit filter portion. The reception filter passes the reception frequency band and attenuates the transmission frequency band, and the transmission filter passes the transmission frequency band and attenuates the reception frequency band.
    However, in the conventional dielectric filter shown in Japanese Patent Laid-Open Publications (1) and (2), although the attenuation characteristics can be made by the gap and the one trap resonator generated by the coupling circuit of the comline coupling, the coupling circuit can be provided. In the clearance obtained at, the depth (attenuation amount) of the clearance cannot be changed. In addition, in order to bring the position of the play closer to the pass band, it is necessary to narrow the pitch of the resonance period (gap of the resonant line hole). However, if the pitch of the resonance period is narrowed, the Qo of the resonator also deteriorates.
    In addition, in the dielectric filter according to the related art, an excitation line is coupled to a resonant line of a first end or a last end of a plurality of resonant lines coupled to a comline to obtain an external coupling, and adjacent to the excitation line. Since a resonance line for the trap resonator is formed, only a single attenuation pole can be obtained in the trap resonator.
    SUMMARY OF THE INVENTION An object of the present invention is to provide a dielectric filter, a duplexer and a communication device using the same, which have both band-stop filter characteristics and band-pass filter characteristics which solve the above-mentioned problems.
    1A to 1D are projection views of the duplexer according to the first embodiment.
    Fig. 2 is an equivalent circuit diagram of the duplexer according to the first embodiment.
    3A and 3B are diagrams showing passage characteristics of the reception filter portion and the transmission filter portion of the duplexer according to the first embodiment.
    4A to 4D are projection views of the dielectric filter according to the second embodiment.
    5 is an equivalent circuit diagram of the dielectric filter according to the second embodiment.
    6A to 6D are projection views of the dielectric filter according to the third embodiment.
    7A and 7B are sectional views showing the configuration of the track portion according to the fourth embodiment.
    8 is a plan view of the duplexer according to the fifth embodiment.
    9 is a block diagram of a high frequency circuit section of the communication device according to the sixth embodiment.
    10A to 10D are projection views of a conventional duplexer.
    11 is an equivalent circuit diagram of a conventional duplexer.
    12A and 12B are diagrams illustrating passage characteristics of a conventional duplexer.
    * Description of the symbols for the main parts of the drawings *
    1: dielectric block 2, 3, 4, 5: hole for resonance line
    7, 8, 9: aftershock track hole 6: earth hole
    10: outer conductor 12, 13, 14, 15: resonant line
    17, 18, 19: aftershock line 21: dielectric substrate
    27: transmitting terminal electrode 28: antenna terminal electrode
    29: receiving terminal electrode 30: input terminal electrode
    31: output terminal electrode
    According to the present invention, a plurality of resonant lines are formed in a dielectric block, in a dielectric substrate, or on a dielectric substrate, and comb-coupled open ends of predetermined adjacent resonant lines in the same direction. A dielectric filter is formed by forming a first trap resonator resonant line interdigitally coupled to one resonant line, an excitation line for signal input / output, and a second trap resonator resonant line interdigitally coupled to the excitation line.
    In this way, among a plurality of resonant lines formed in the dielectric block, in the dielectric substrate, or on the dielectric substrate, adjacent predetermined resonant lines are combined in a combina- tion to cause band pass filter characteristics at that portion. In addition, a first attenuation pole is generated by the first trap resonator resonant line interdigitally coupled with one of the resonant lines, and the interdigital coupling between the excitation line for signal input / output and the resonant line for the second trap resonator is performed. As a result, a second attenuation pole is generated. By the occurrence of the first attenuation pole and the second attenuation pole, it is possible to greatly attenuate for a relatively wide frequency band, and to greatly improve the attenuation characteristics of the low pass side or the high pass side of the pass band.
    In addition, the present invention forms a transmission filter and a reception filter comprising a plurality of resonant lines in which predetermined resonant lines are coupled in a dielectric block, in a dielectric substrate, or on a dielectric substrate, respectively, A duplexer is formed by forming a resonant line for an interdigital coupling on an excitation line coupled to the resonance line, or on a resonance line of the first stage of the transmission filter and an excitation line coupled to the resonance line.
    With this arrangement, if a resonant line for a trap resonator which is interdigitally coupled to each of the resonant line of the last stage of the receiving filter and the excitation line coupled to the resonant line is formed, the attenuation poles of the two resonant resonator lines Receive filter characteristics with In addition, if a resonant line for the first stage of the transmission filter and a resonant line for trap resonator for interdigital coupling to each of the excitation lines coupled to the resonant line are formed, the transmission has attenuation poles by the two resonant lines for the trap resonator. Filter characteristics can be obtained. Thereby, the characteristic of the reception filter which greatly attenuates a transmission frequency band can be acquired easily, and the transmission filter which greatly attenuates a reception frequency band can be obtained easily.
    In addition, the present invention forms the dielectric filter or duplexer in the high frequency circuit portion to form a communication device.
    The structure of the duplexer which concerns on 1st Embodiment of this invention is demonstrated with reference to FIGS. 1A-3B.
    1A to 1D are projection views of the duplexer, FIG. 1A is a front view, FIG. 1B is a left side view, FIG. 1C is a right side view, and FIG. 1D is a top view. However, the surface shown in FIG. 1A is a mounting surface for a circuit board.
    The duplexer is formed by forming various holes and electrodes with respect to the rectangular parallelepiped dielectric block 1. That is, 2 (2a, 2b, 2c), 3, 4 (4a, 4b, 4c, 4d) and 5 (5a, 5b) are holes for the resonant line, and the resonant lines are formed by forming internal conductors on their inner surfaces. . 7, 8 and 9 are holes for the aftershock tracks, and the aftershock lines are formed by forming inner conductors on their inner surfaces. In the resonant line, an electrode non-forming portion indicated by g is formed inside the hole, and an open end is formed inside the hole. In the drawing, L1, L2... Ld is a serial number attached to the various lines for reference in an equivalent circuit to be shown later.
    6 (6a, 6b, 6c, 6d, 6e) are earth holes, respectively, and the inner conductor is formed in all the surfaces of these inner surfaces. On the outer surface of the dielectric block 1, the outer conductor 10 is formed in the region other than the terminal electrode mentioned later. The inner conductor of the earth hole 6 is electrically conductive to the outer conductor of opposite ends of the dielectric block 1.
    One end of the excitation line hole 7 is provided with a transmission terminal electrode 27. One end of the inner conductor of the excitation line hole 7 is connected to this transmission terminal electrode 27, and the other end is connected to the outer conductor 10. An antenna terminal electrode 28 is formed at one end of the excitation line hole 8. One end of the inner conductor of the excitation line hole 8 is connected to the antenna terminal electrode 28, and the other end is connected to the outer conductor 10. Similarly, a receiving terminal electrode 29 is formed at one end of the excitation line hole 9, and one end of the inner conductor of the excitation line hole 9 is connected to the receiving terminal electrode 29. One end is connected to the outer conductor 10.
    The operation of the duplexer configured as described above is as follows. First, the resonant lines formed in the resonant line holes 2a, 2b, and 2c have open ends of the resonant lines facing the same direction, and are comb-lined together. The resonance line formed in the resonance line hole 2c and the excitation line formed in the excitation line hole 8 are interdigitally coupled. In addition, the resonant line formed in the resonant line hole 2a and the aftershock line formed in the excitation line hole 7 are interdigitally coupled. Further, the resonant line formed in the resonant line hole 3 and the aftershock line formed in the excitation line hole 7 are interdigitally coupled. The earth hole 6a breaks the coupling between the resonance line hole 3 and the resonance line of the resonance line hole 2a. As a result, the transmission terminal electrode 27 and the antenna terminal electrode 28 pass through a predetermined frequency band and act as a transmission filter having one attenuation pole.
    In addition, the resonant lines of the resonant line holes 4a, 4b, and 4c respectively have their open ends directed in the same direction, and are comma-coupled. The resonant line of the resonant line hole 4c and the resonant line of the resonant line hole 4d are interdigitally coupled. The four-stage resonator by the four resonant lines provides the band pass filter characteristics. The resonant line of the resonant line hole 4d and the resonant line of the resonant line hole 5a are interdigitally coupled, and the resonant line of the resonant line hole 5a and the resonant line hole 5b is interleaved. Digital combine. At the same time, the resonance line of the resonance line hole 4d and the excitation line of the excitation line hole 9 are interdigitally coupled. Further, the earth holes 6c and 6d break the coupling between the resonant line of the resonant line hole 4c and the resonant line hole 5a, and the earth hole 6e is used for the resonant line hole 5a and the resonant line. The coupling between the resonant lines of the hole 5b is broken. As a result, the resonant line of the fourth-stage resonant line hole 4d and the excitation line of the excitation line hole 9 constitute a π / 2 or more circuit, and the resonant lines of the resonant line holes 5a and 5b are respectively formed. It acts as a trap resonator and two trap resonators are ideally coupled at π / 2. Therefore, between the antenna terminal electrode 28 and the receiving terminal electrode 29 passes through a predetermined frequency band and acts as a receiving filter having attenuation poles by two trap resonators.
    FIG. 2 is an equivalent circuit diagram of the duplexer shown in FIGS. 1A to 1D. Here, subscripts such as Z1 and Z2 correspond to the serial numbers of the tracks shown in Figs. 1A to 1D. For example, Z1 corresponds to the track L1 shown in Figs. 1A to 1D, and Z2 is a Fig. 1A to 1D. It corresponds to the line L2 shown in FIG. 1D. In addition, the impedance indicated by the single digit subscripts such as Z1 and Z2 is the impedance due to the magnetic capacitance of the resonance line and the excitation line, and the impedance represented by the two digit subscripts such as Z12 and Z23 is the resonance lines or resonances to be combined. Impedance due to mutual capacitance between the line and the excitation line. For example, Z12 corresponds to the mutual capacitance between the lines L1 and L2, and Z23 corresponds to the mutual capacitance between the lines L2 and L3.
    Here, when the magnetic capacitance of the resonator is Ci, the mutual capacitance of the resonator is Cij, the dielectric constant of the dielectric block is R and the light flux is vc, it is generally expressed as follows.
    Zi = √ (εr) / (vcCi)
    Zij = √ (εr) / (vcCij)
    Since Z12 acts as an ideal circuit of π / 2 in Fig. 2, (Z1, Z12) acts as a trap resonator. Z3, Z4 and Z5 act as comb-lined three-stage resonators in order. Z7, Z8, Z9 and Za act as a four stage resonator coupled in sequence. In addition, since Zac and Zbd each act as an ideal circuit having an electrical length / 2 at a frequency for generating an attenuation pole, (Zc, Zac) and (Zd, Zbd) each act as a trap resonator. Since Zab acts as a π / 2 or more circuit between the trap resonators, two trap resonators are connected to the receiving filter.
    3A and 3B are diagrams showing the passage characteristics of the duplexer. 3A is a pass characteristic of the receive filter portion, and FIG. 3B is a pass characteristic of the transmit filter portion. In this example, the low frequency side is used as the transmission frequency band and the high frequency side is used as the communication frequency band. In the reception filter, while passing the reception frequency band, the low frequency side, that is, the transmission frequency band is attenuated by two attenuation poles. Due to this characteristic, the attenuation curve on the low pass side of the pass band is steep, and the amount of attenuation in the transmission frequency band is increased to sufficiently suppress the interference caused by the signal in the transmission frequency band to the receiving circuit.
    Since the present invention does not need to form an attenuation pole by the above-described clearance of the coupling circuit, for example, in order to bring the attenuation pole frequency closer to the pass band, it is necessary to narrow the resonance period pitch (gap of the resonant line hole). In addition, by widening the resonance period pitch, Qo (Qodd) is greatly improved, and insertion loss characteristics are improved.
    In the first embodiment, two trap resonators are formed in the receiving filter portion, but similarly, two trap resonators may be formed on the transmission filter side. That is, an excitation line coupled to the resonant line of the first stage of the transmission filter and a resonant line for the trap resonator to be interdigitally coupled to the resonant line may be formed.
    Next, the structure of the dielectric filter which concerns on 2nd Embodiment is demonstrated with reference to FIGS. 4A-4D and FIG.
    This dielectric filter corresponds to taking out the receiving filter portion of the duplexer shown in Figs. 1A to 1D, and forming another trap resonator on the input end side thereof. That is, the dielectric filter is formed by forming a plurality of holes and electrodes in the rectangular-shaped dielectric block 1, and 3, 4 (4a, 4b, 4c, 4d), and 5 (5a, 5b) are holes for the resonant line. The internal conductor is formed on these inner surfaces to form a resonance line. 8 and 9 are holes for the aftershock tracks, and the aftershock lines are formed by forming inner conductors on their inner surfaces. In the resonant line, an electrode non-forming portion indicated by g is formed inside the hole, and an open end is formed inside the hole. 6 (6a, 6c, 6d, 6e) are earth holes, respectively, and internal conductors are formed in all surfaces of these inner surfaces. On the outer surface of the dielectric block 1, an outer conductor 10 is formed in a region other than the terminal electrode. The inner conductor of the earth hole 6 is electrically conductive to the outer conductors at opposite ends of the dielectric block 1.
    An input terminal electrode 30 is formed at one end of the excitation line hole 8, and one end of the inner conductor of the excitation line hole 8 is conductive to the input terminal electrode 30, and the other end thereof. Is conductive to the outer conductor 10. Similarly, an output terminal electrode 31 is formed at one end of the excitation line hole 9, and one end of the inner conductor of the excitation line hole 9 is conductive to this output terminal electrode 31. One end is connected to the outer conductor 10.
    Fig. 5 is an equivalent circuit diagram of the dielectric filter shown in Figs. 4A to 4D. The meaning of each line represented by the symbol of impedance is the same as that of the case of 1st Embodiment. In Fig. 5, since Z16 acts as an ideal circuit of / 2, (Z1, Z16) acts as a trap resonator. The Z7 to Za portions act as four-stage resonators combined in sequence. The structure of the output side (right side in drawing) from Z9a is the same as that of the case of 1st Embodiment. As a result, a total of three trap resonators are connected to the reception filter. By appropriately setting the resonant frequencies of these trap resonators, it is possible to obtain a band pass filter in which the high pass side, the low pass side, or both sides of the pass band are steeply attenuated.
    Next, the structure of the dielectric filter concerning 3rd Embodiment is demonstrated with reference to FIGS. 6A-6D.
    In the first and second embodiments, an outer conductor is also formed on the opening face of the resonant line hole of the dielectric block, an electrode non-forming portion is formed inside the resonant line hole, and an open end is formed inside the hole. As an example, in the third embodiment, the open end of the resonant line is formed on the open face of the hole for the resonant line of the dielectric block. Incidentally, in the first and second embodiments, an excitation line is formed to be coupled with the resonance line. In the third embodiment, the terminal electrode formed on the outer surface of the dielectric block is coupled to the resonance line.
    6A to 6D are projection views of the duplexer according to the third embodiment, FIG. 6A is a front view, FIG. 6B is a left side view, FIG. 6C is a right side view, and FIG. 6D is a top view. 6A is a mounting surface for the circuit board.
    This duplexer is formed by forming various holes and electrodes for the rectangular parallelepiped dielectric block 1. That is, 2 (2a, 2b, 2c), 3, 4 (4a, 4b, 4c, 4d) and 5 (5a, 5b) are holes for the resonant line, and the resonant lines are formed by forming internal conductors on their inner surfaces. . 9 is a hole for an aftershock track, and the aftershock track is formed by forming an inner conductor in the inner surface. An outer conductor 10 is formed on the outer surface of the dielectric block 1 in regions other than the open end electrode and the terminal electrode, which will be described later, and one end of the hole for the resonance line and the hole for the excitation line is short-circuited with the resonance line and the excitation line. It is sweet. In addition, an open end electrode is formed on the other opening of the hole for the resonant line, which is widened in a square shape.
    6 (6c, 6d, 6e) are earth holes, respectively, and form inner conductor in all the surfaces of those inner surfaces. The inner conductor of the earth hole 6 is electrically conductive to the outer conductors at opposite ends of the dielectric block 1.
    27 is a transmission terminal electrode, and is formed in the vicinity of the opening end side opening of the resonant line holes 2a and 3. 28 is an antenna terminal electrode, and is formed in the vicinity of the opening end side opening of the resonant line holes 2c and 4a. A receiving terminal electrode 29 is formed at one end of the excitation line hole 9, and one end of the inner conductor of the excitation line hole 9 is conducted to the receiving terminal electrode 29.
    The operation of the duplexer configured as described above is basically the same as that shown in the first embodiment. That is, the resonant lines formed in the resonant line holes 2a, 2b, and 2c are coupled by the capacitance between the open end electrodes of each resonant line. The respective resonant lines and the transmitting terminal electrodes 27 formed in the resonant line holes 2a and 3 are coupled by capacitance between them. Similarly, the respective resonant lines formed in the resonant line holes 2c and 4a and the antenna terminal electrode 28 are coupled by capacitance between them. As a result, the transmission terminal electrode 27 and the antenna terminal electrode 28 pass through a predetermined frequency band and act as a transmission filter having one attenuation pole.
    The resonant lines of each of the resonant line holes 4a, 4b, and 4c are coupled by the capacitance between the respective open end electrodes. The operations of the resonant line holes 4c, 4d, 5a, and 5b and the earth holes 6c, 6d, and 6e are the same as those in the first embodiment shown in Figs. 1A to 1D. As a result, the resonant line of the fourth-stage resonant line hole 4d and the excitation line of the excitation line hole 9 constitute a π / 2 or more circuit, and the resonant lines of the resonant line holes 5a and 5b are respectively formed. It acts as a trap resonator and two trap resonators are ideally coupled at π / 2. Therefore, between the antenna terminal electrode 28 and the receiving terminal electrode 29 passes a predetermined frequency band and acts as a receiving filter having attenuation poles by two trap resonators.
    In the above-described embodiment, the resonant line, the excitation line, and the earth line are respectively formed by forming various holes in the rectangular parallelepiped dielectric block and forming internal conductors on the inner surface thereof. You may comprise. 7A and 7B are cross-sectional views of the track for one example. 7A is a cross-sectional view showing a state before laminating two dielectric substrates, and FIG. 7B is a cross-sectional view in a laminated state. In this way, grooves are formed in the dielectric substrates 21a and 21b to form internal conductors on the inner surface of the grooves, and two dielectric substrates 21a and 21b are laminated to form a line in the substrate.
    The various lines may be formed on a dielectric substrate. 8 is a diagram illustrating an example in which the duplexer is applied in that case. 8 and 21 are dielectric substrates, and resonant lines 12a, 12b, 12c, 13a, 14a, 14b, 14c, 14d, 15a, and 15b are formed on the upper surface thereof, respectively. In addition, the aftershock tracks 17, 18, and 19 are formed, respectively. Here, the resonant lines 12a, 12b, and 12c each act as a lambda / 2 resonator whose both ends are open, and are coupled in a comb line. In addition, the resonance line 12a and the excitation line 17 are interdigitally coupled, and the excitation line 17 and the resonance line 13 are also interdigitally coupled. An interdigital coupling between the resonance line 12c and the excitation line 18 is also performed. As a result, between the Tx terminal and the ANT terminal, the band pass filter characteristic by the resonant lines 12a, 12b, and 12c and the band stop filter characteristic by the trap circuit of the resonant line 13 are combined.
    In Fig. 8, the resonant lines 14a, 14b, and 14c each act as a lambda / 2 resonator whose both ends are open, and are combined in a comline. In addition, the resonant line 14c and the resonant line 14d are interdigitally coupled, the resonant line 14d and the excitation line 19 are interdigitally coupled, and the resonant line 14d and the resonant line 15a are interdigitally coupled. Then, the excitation line 19 and the resonance line 15b are interdigitally coupled. As a result, between the ANT terminal and the Rx terminal, a band pass filter characteristic by the resonant lines 14a, 14b, 14c, and 14d and a band stop filter characteristic by two trap circuits of the resonant lines 15a and 15b are synthesized. Will be displayed.
    Next, the configuration of the communication device using the dielectric filter or the duplexer will be described with reference to FIG. In the figure, ANT is a transmitting / receiving antenna, DPX is a duplexer, BPFa, BPFb, BPFc is a band pass filter, AMPa, AMPb is an amplifier circuit, MIXa, MIXb is a mixer, OSC is an oscillator, and DIV is a divider (synthesizer). to be. The MIXa modulates the frequency signal output from the DIV into a modulated signal, the BPFa passes only the band of the transmission frequency, and the AMPa power amplifies it and is transmitted from the ANT through the DPX. The BPFb only passes the reception frequency band among the signals output from the DPX, and the AMPb amplifies it. The MIXb mixes the frequency signal and the received signal output from the BPFc and outputs the intermediate frequency signal IF.
    The duplexer DPX shown in Fig. 9 may use a duplexer having the structure shown in Figs. 1A to 1D. As the pass band filters BPFa, BPFb, and BPFc, a dielectric filter having the structure shown in Figs. 4A to 4D can be used. In this way, a generally small communication device can be configured.
    According to the invention of claim 1, two attenuation poles are generated by the two trap resonators, which can greatly attenuate for a relatively wide frequency band, and can greatly improve the attenuation characteristics of the low pass or high pass of the pass band. have. Further, since it is independent of the resonance period pitch, the resonance period pitch can be widened to increase Qo, and the insertion loss in the pass band can be sufficiently suppressed.
    According to the invention according to claim 2, it is possible to easily obtain a duplexer having a characteristic of greatly attenuating the frequency band of the counterpart filter with respect to one or both of the transmission filter and the reception filter.
    According to the invention of claim 3, a compact communication device having excellent high frequency circuit characteristics can be obtained by using a small filter or duplexer that passes a desired frequency band with a low insertion loss and greatly attenuates a cutoff frequency band.
    权利要求:
    Claims (3)
    [1" claim-type="Currently amended] A plurality of resonant lines are formed in the dielectric block, in the dielectric substrate, or on the dielectric substrate, and the open ends of the adjacent predetermined resonant lines are commingly coupled in the same direction, and one resonant line of the plurality of resonant lines is provided. And a second trap resonator resonant line interdigitally coupled to the excitation line, and a first trap resonator line interdigitally coupled to each other.
    [2" claim-type="Currently amended] In the dielectric block, in the dielectric substrate, or on the dielectric substrate, a transmission filter and a reception filter including a plurality of resonant lines coupled to predetermined resonant lines are formed, respectively, and are coupled to the resonant line and the resonant line at the end of the receive filter. A duplexer formed by forming a resonant line for a trap resonator which is interdigitally coupled to an excitation line, or to an resonance line of a first stage of a transmission filter and an excitation line coupled to the resonance line.
    [3" claim-type="Currently amended] A communication device comprising the dielectric filter of claim 1 or the duplexer of claim 2 formed in a high frequency circuit portion.
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    同族专利:
    公开号 | 公开日
    JP2000209004A|2000-07-28|
    DE69937818D1|2008-02-07|
    EP1001479A1|2000-05-17|
    EP1001479B1|2007-12-26|
    CN1140007C|2004-02-25|
    DE69937818T2|2008-12-11|
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    JP3498649B2|2004-02-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1998-11-13|Priority to JP32339298
    1998-11-13|Priority to JP10-323392
    1999-10-13|Priority to JP29157499A
    1999-10-13|Priority to JP11-291574
    1999-11-11|Application filed by 무라타 야스타카, 가부시키가이샤 무라타 세이사쿠쇼
    2000-07-25|Publication of KR20000047623A
    2002-09-26|Application granted
    2002-09-26|Publication of KR100353593B1
    优先权:
    申请号 | 申请日 | 专利标题
    JP32339298|1998-11-13|
    JP10-323392|1998-11-13|
    JP29157499A|JP3498649B2|1998-11-13|1999-10-13|Dielectric filter, duplexer and communication device|
    JP11-291574|1999-10-13|
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