WO2010098237A1 - フィルタ回路ならびにそれを用いた無線通信モジュールおよび無線通信機器 - Google Patents
フィルタ回路ならびにそれを用いた無線通信モジュールおよび無線通信機器 Download PDFInfo
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- WO2010098237A1 WO2010098237A1 PCT/JP2010/052303 JP2010052303W WO2010098237A1 WO 2010098237 A1 WO2010098237 A1 WO 2010098237A1 JP 2010052303 W JP2010052303 W JP 2010052303W WO 2010098237 A1 WO2010098237 A1 WO 2010098237A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0123—Frequency selective two-port networks comprising distributed impedance elements together with lumped impedance elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1708—Comprising bridging elements, i.e. elements in a series path without own reference to ground and spanning branching nodes of another series path
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/09—Filters comprising mutual inductance
Definitions
- the present invention relates to a filter circuit having two pass bands, and a wireless communication module and a wireless communication device using the filter circuit.
- the present invention has been devised in view of such problems in the prior art, and its purpose is to arbitrarily set the frequencies of the two passbands, and in the frequency domain between the two passbands.
- An object of the present invention is to provide a filter circuit in which attenuation is sufficiently secured, and a wireless communication module and a wireless communication device using the filter circuit.
- the filter circuit of the present invention includes a first band-pass filter having a first frequency band as a pass band, and a second band having a second frequency band having a frequency higher than the first frequency band as a pass band.
- the resonator group of at least one of the first band-pass filter and the second band-pass filter includes both the quarter-wave resonator and the half-wave resonator.
- One end side of the half-wave resonator is coupled to the resonator on the adjacent input terminal side or the input terminal, and the other end side of the half-wave resonator is When the number of the half-wave resonators included in the resonator group is 0 or an even number in the first band-pass filter, which is coupled to an adjacent resonator on the output terminal side or the output terminal.
- e 1.
- the number of the half-wave resonators included in the resonator group of the second band-pass filter and the number of the half-wave resonators included in the resonator group of the second bandpass filter are determined. It is a feature.
- the filter circuit is positioned between the first frequency band that is the pass band of the first band pass filter and the second frequency band that is the pass band of the second band pass filter.
- the phase difference between the electrical signal passing through the first bandpass filter and the electrical signal passing through the second bandpass filter can be canceled and canceled.
- a filter circuit having excellent pass characteristics having an attenuation pole in the pass band can be obtained.
- a first bandpass filter whose passband is the first frequency band and a second bandpass filter whose passband is the second frequency band having a frequency higher than the first frequency band are parallel to each other. Since this is a filter circuit having two pass bands that are connected to each other, a filter circuit that can arbitrarily set the frequencies of the two pass bands can be obtained.
- the wireless communication module of the present invention includes an RF unit including the filter circuit having the above configuration and a baseband unit connected to the RF unit.
- the wireless communication device of the present invention includes the wireless communication module configured as described above and an antenna connected to the RF unit.
- the filter circuit of the present invention it is possible to arbitrarily set the frequencies of the two pass bands and obtain a filter circuit having excellent pass characteristics having an attenuation pole between the two pass bands.
- signals in two communication bands are obtained using the filter circuit of the present invention in which attenuation is sufficiently ensured in the frequency region between the two passbands. Since filtering can be performed, it is possible to obtain a wireless communication module and a wireless communication device that are small and have good communication quality.
- FIG. 2 is an equivalent circuit diagram showing a first bandpass filter 20 in FIG. 1.
- FIG. 3 is an equivalent circuit diagram showing a second bandpass filter 30 in FIG. 1. It is a figure which shows the simulation result of the electrical property of the circuit shown in FIG. It is a figure which shows the simulation result of the electrical property of the circuit shown in FIG. It is a figure which shows the simulation result of the electrical property of the circuit shown in FIG. It is a figure which shows the simulation result of the electrical property of the circuit shown in FIG. It is an equivalent circuit diagram which shows the filter circuit of a comparative example. It is a figure which shows the simulation result of the electrical property of the circuit shown in FIG. It is an equivalent circuit diagram which shows the filter circuit of the 2nd example of embodiment of this invention.
- FIG. 2 is an equivalent circuit diagram showing a first bandpass filter 20 in FIG. 1.
- FIG. 3 is an equivalent circuit diagram showing a second bandpass filter 30 in FIG. 1. It is a figure which shows the simulation result of the electrical property of the circuit shown in FIG. It is
- FIG. 10 is an equivalent circuit diagram showing the first bandpass filter 20 in FIG. 9.
- FIG. 16 is an equivalent circuit diagram showing a second bandpass filter 30 in FIGS. 9 and 15. It is a figure which shows the simulation result of the electrical property of the circuit shown in FIG. It is a figure which shows the simulation result of the electrical property of the circuit shown in FIG. It is a figure which shows the simulation result of the electrical property of the circuit shown in FIG. It is an equivalent circuit diagram which shows the filter circuit of the 3rd example of embodiment of this invention.
- FIG. 16 is an equivalent circuit diagram showing the first bandpass filter 20 in FIG. 15. It is a figure which shows the simulation result of the electrical property of the circuit shown in FIG. It is a figure which shows the simulation result of the electrical property of the circuit shown in FIG. It is a block diagram which shows typically the radio
- FIG. 1 is an equivalent circuit diagram showing a filter circuit of a first example of an embodiment of the present invention.
- FIG. 2 is an equivalent circuit diagram showing the first band-pass filter 20 in the filter circuit of FIG.
- FIG. 3 is an equivalent circuit diagram showing the second bandpass filter 30 in the filter circuit of FIG.
- a first band pass filter 20 and a second band pass filter 30 are connected in parallel between an input terminal 11 and an output terminal 12.
- the first band pass filter 20 uses the first frequency band as a pass band.
- the second band pass filter 30 uses the second frequency band as a pass band.
- the input terminal 11 and the output terminal 12 are shared by the first band pass filter 20 and the second band pass filter 30.
- the filter circuit of the present example having such a configuration, the first frequency band and the second frequency band can be arbitrarily set, so that the frequencies of the two pass bands can be set arbitrarily. A possible filter circuit can be obtained.
- the first band-pass filter 20 has an input stage resonator 21 and an output stage resonator 22 each composed of a quarter-wave resonator with one end grounded. ing.
- a pass band is formed by the resonator group including the two resonators 21 and 22.
- the other ends of the input stage resonator 21 and the output stage resonator 22 are coupled by an inductor 25.
- the other end of the resonator 21 in the input stage and the input terminal 11 are coupled by a capacitor 23, and the other end of the resonator 22 in the output stage and the output terminal 12 are coupled by a capacitor 24.
- the second bandpass filter 30 includes an input stage resonator 31, an output stage resonator 32, and a resonator 33.
- the resonator 31 at the input stage and the resonator 32 at the output stage are each composed of a quarter wavelength resonator with one end grounded.
- the resonator 33 is a half-wave resonator with both ends open, and is disposed between the resonator 31 at the input stage and the resonator 32 at the output stage.
- a pass band is formed by the resonator group composed of the three resonators 31 to 33.
- the other end of the input stage resonator 31 and one end of the resonator 33 are coupled by a capacitor 35, and the other end of the resonator 33 and the other end of the output stage resonator 32 are coupled by a capacitor 36.
- the other end of the input stage resonator 31 and the input terminal 11 are coupled by a capacitor 34, and the other end of the output stage resonator 32 and the output terminal 12 are coupled by a capacitor 37.
- FIG. 4 shows the simulation results of the electrical characteristics of the filter circuit of this example shown in FIG.
- FIG. 5 shows a simulation result of the electrical characteristics of the first bandpass filter 20 shown in FIG.
- FIG. 6 shows a simulation result of the electrical characteristics of the second bandpass filter 30 shown in FIG.
- FIG. 7 shows a filter circuit of a comparative example in which the 1 ⁇ 2 wavelength resonator 33 of the second bandpass filter 30 in the filter circuit of this example shown in FIG. 1 is replaced with a 1 ⁇ 4 wavelength resonator.
- the simulation result of the electrical characteristics is shown in FIG.
- the horizontal axis represents frequency and the vertical axis represents attenuation.
- the transmission characteristic (S21) when the input terminal 11 is port 1 and the output terminal 12 is port 2 is indicated by a thick solid line
- the reflection characteristic (S11) is indicated by a thin solid line.
- the resonators 21, 22, and 31 to 33 are in a dielectric having a relative dielectric constant of 18.7 and a thickness of 1 mm with ground conductors arranged on the upper and lower surfaces.
- the length of the resonators 21 and 22 is 6 mm
- the length of the resonators 31 and 32 is 3 mm
- the length of the resonator 33 is 7.42 mm.
- the inductor 25 is 15 nH.
- Capacitors 23 and 24 were 0.65 pF.
- Capacitors 34 and 37 were set to 0.5 pF, and capacitors 35 and 36 were set to 0.19 pF.
- the element values are the same as those in the circuit shown in FIG. 1 except that the length of the resonator 33 is 3.3 mm.
- the first band-pass filter is used.
- the present inventor has made various studies in order to obtain a condition for canceling out the electrical signal passing through the filter 20 and the electrical signal passing through the second bandpass filter 30.
- a resonator group consisting of a plurality of resonators sequentially arranged so as to be coupled to each other to form a pass band, an input terminal coupled to the resonator of the input stage, and an output coupled to the resonator of the output stage
- a resonator group is configured by at least one of a quarter-wave resonator whose one end is short-circuited and a half-wave resonator whose both ends are open.
- One end side is coupled to a resonator or input terminal on the adjacent input terminal side, and the other end side of the half-wavelength resonator is coupled to a resonator or output terminal on the adjacent output terminal side.
- the phase in the frequency region outside the passband is inverted depending on whether the coupling between the output terminal and the resonator of the output stage is mainly capacitive or mainly inductive. 5). Each time the number of resonators constituting the resonator group changes by one, the phase in the frequency region on the lower frequency side than the pass band is inverted. 6). In the pass characteristic of the bandpass filter, when an attenuation pole formed by a phase difference between signals transmitted through a plurality of routes is formed outside the passband, the phase is inverted on both sides of the attenuation pole. 7). The number where the coupling between adjacent resonators is mainly capacitive in the resonator group does not affect the phase in the frequency region outside the passband. Further, the number of resonators constituting the resonator group does not affect the phase in the frequency region on the higher frequency side than the pass band.
- the first bandpass filter having the first frequency band as the passband and the second bandpass having the second frequency band having a frequency higher than the first frequency band as the passband.
- the electrical signal passing through the first bandpass filter and the electrical signal passing through the second bandpass filter are canceled out.
- the conditions under which the attenuation pole can be formed in the third frequency band located between the first frequency band and the second frequency band were examined, and the following results were obtained.
- the first band-pass filter In the pass characteristic of the first band-pass filter, it is formed in a frequency region between the third frequency band and the first frequency band located between the first frequency band and the second frequency band.
- the number of half-wavelength resonators included in the resonator group is 0, and between adjacent resonators in the resonator group.
- the number of places where the coupling is mainly inductive is 1, and the coupling between the input terminal 11 and the input stage resonator 21 and the coupling between the output terminal 12 and the output stage resonator 22 are both capacitive.
- the attenuation pole formed by the phase difference between signals transmitted through a plurality of routes is not formed.
- the number of half-wavelength resonators included in the resonator group is 1, and the number of couplings between adjacent resonators in the resonator group is mainly inductive.
- the coupling between the input terminal 11 and the input stage resonator 31 and the coupling between the output terminal 12 and the output stage resonator 32 are both capacitive, and the number of resonators constituting the resonator group is three. is there.
- the attenuation pole formed by the phase difference between signals transmitted through a plurality of routes is not formed.
- the resonator group of one bandpass filter of the two bandpass filters is composed of only a quarter wavelength resonator, and the resonance of the other bandpass filter. Since the unit group is composed of a quarter wavelength resonator and one half wavelength resonator, it has a good pass characteristic having an attenuation pole in a frequency region between two pass bands and is small. The filter circuit can be obtained.
- FIG. 9 is an equivalent circuit diagram showing the filter circuit of the second example of the embodiment of the present invention.
- FIG. 10 is an equivalent circuit diagram showing the first band-pass filter 20 in the filter circuit of FIG.
- FIG. 11 is an equivalent circuit diagram showing the second bandpass filter 30 in the filter circuit of FIG.
- a first band pass filter 20 and a second band pass filter 30 are connected in parallel between an input terminal 11 and an output terminal 12.
- the first band pass filter 20 uses the first frequency band as a pass band.
- the second band pass filter 30 uses the second frequency band as a pass band.
- the input terminal 11 and the output terminal 12 are shared by the first band pass filter 20 and the second band pass filter 30.
- the first band-pass filter 20 has an input stage resonator 21 and an output stage resonator 22 each composed of a quarter-wave resonator with one end grounded. ing.
- a pass band is formed by the resonator group including the two resonators 21 and 22.
- the other ends of the input stage resonator 21 and the output stage resonator 22 are coupled by an inductor 25.
- the other end of the resonator 21 in the input stage and the input terminal 11 are coupled by a capacitor 23, and the other end of the resonator 22 in the output stage and the output terminal 12 are coupled by a capacitor 24.
- the input terminal 11 and the output terminal 12 are connected by the capacitor 26.
- the capacitor 26 includes an electric signal transmitted through the route of the input terminal 11 ⁇ the capacitor 23 ⁇ the inductor 25 ⁇ the capacitor 24 ⁇ the output terminal 12, and the input terminal 11 ⁇ the capacitor 26 ⁇ the output terminal 12. It is arranged to cancel out by causing a phase difference close to 180 ° with respect to the electrical signal transmitted through the route.
- attenuation poles can be formed on both sides of the pass band in the pass characteristic of the first band pass filter 20.
- the second band-pass filter 30 has an input stage resonator 31, an output stage resonator 32, and a resonator 33, as shown in FIGS.
- the resonator 31 of the input stage is a quarter wavelength resonator whose one end is grounded.
- the output-stage resonator 32 is a half-wave resonator with both ends open.
- the resonator 33 is a half-wave resonator with both ends open, and is disposed between the resonator 31 at the input stage and the resonator 32 at the output stage.
- a pass band is formed by the resonator group composed of the three resonators 31 to 33.
- the other end of the input stage resonator 31 and one end of the resonator 33 are coupled by a capacitor 35, and the other end of the resonator 33 and one end of the output stage resonator 32 are coupled by a capacitor 36.
- the input terminal 11 and the other end of the input stage resonator 31 are coupled by a capacitor 34, and the other end of the output stage resonator 32 and the output terminal 12 are coupled by a capacitor 37.
- FIG. 12 shows the simulation results of the electrical characteristics of the filter circuit of this example shown in FIG.
- FIG. 13 shows a simulation result of the electrical characteristics of the first bandpass filter 20 shown in FIG.
- FIG. 14 shows the simulation result of the electrical characteristics of the second bandpass filter 30 shown in FIG.
- the horizontal axis represents frequency and the vertical axis represents attenuation.
- the transmission characteristic (S21) when the input terminal 11 is port 1 and the output terminal 12 is port 2 is indicated by a thick solid line
- the reflection characteristic (S11) is indicated by a thin solid line.
- the resonators 21, 22, and 31 to 33 are in a dielectric having a relative dielectric constant of 18.7 and a thickness of 1 mm in which ground conductors are arranged on the upper and lower surfaces.
- the length of the resonators 21 and 22 is 6 mm
- the length of the resonator 31 is 3 mm
- the length of the resonator 32 is 7.54 mm
- the length was 7.0 mm.
- the inductor 25 is 15 nH.
- Capacitors 23 and 24 were 0.65 pF.
- Capacitor 26 was 0.15 pF.
- the capacitors 34 and 37 were 0.5 pF, and the capacitors 35 and 36 were 0.14 pF.
- the pass characteristic of the first bandpass filter 20 shown in FIG. 13 is based on the phase difference between the electrical signals transmitted by the two routes on the high frequency side and the low frequency side near the pass band.
- the attenuation pole to be formed is formed, it can be seen that no attenuation pole is seen in the pass characteristic of the second band-pass filter 30 shown in FIG.
- the pass characteristic of the filter circuit of this example shown in FIG. 12 it is between the attenuation pole on the high frequency side near the pass band of the first band pass filter 20 and the pass band of the second band pass filter 30. It can be seen that another attenuation pole is formed in the frequency domain.
- FIG. 15 is an equivalent circuit diagram showing the filter circuit of the third example of the embodiment of the present invention.
- FIG. 16 is an equivalent circuit diagram showing the first bandpass filter 20 in the filter circuit of FIG.
- the second band-pass filter 30 in the filter circuit of this example is exactly the same as the second band-pass filter 30 of the second example of the above-described embodiment shown in FIG.
- the electrical characteristics are as shown in FIG.
- a first band pass filter 20 and a second band pass filter 30 are connected in parallel between an input terminal 11 and an output terminal 12.
- the first band pass filter 20 uses the first frequency band as a pass band.
- the second band pass filter 30 uses the second frequency band as a pass band.
- the input terminal 11 and the output terminal 12 are shared by the first band pass filter 20 and the second band pass filter 30.
- the first band-pass filter 20 includes an input stage resonator 21, an output stage resonator 22, and a resonator composed of a quarter wavelength resonator with one end grounded.
- the resonator 23 is disposed between the resonator 21 at the input stage and the resonator 22 at the output stage, and a pass band is formed by the resonator group including the three resonators 21 to 23.
- the other ends of the resonator 21 and the resonator 23 at the input stage are coupled by a capacitor 25, and the other ends of the resonator 23 and the resonator 22 at the output stage are coupled by a capacitor 26.
- the other end of the input stage resonator 21 and the input terminal 11 are coupled by a capacitor 24, and the other end of the output stage resonator 22 and the output terminal 12 are coupled by a capacitor 27.
- FIG. 17 shows the simulation results of the electrical characteristics of the filter circuit of this example shown in Fig. 15.
- FIG. 18 shows a simulation result of the electrical characteristics of the first bandpass filter 20 shown in FIG.
- the horizontal axis represents frequency and the vertical axis represents attenuation.
- the transmission characteristic (S21) when the input terminal 11 is port 1 and the output terminal 12 is port 2 is indicated by a thick solid line
- the reflection characteristic (S11) is indicated by a thin solid line.
- the resonators 21 to 23 have a width provided in a dielectric having a relative permittivity of 18.7 and a thickness of 1 mm, with ground conductors arranged on the upper and lower surfaces.
- a strip line having a length of 0.2 mm and a length of 6 mm was used.
- the capacitors 24 and 27 were 0.6 pF.
- Capacitors 25 and 26 were set to 0.15 pF.
- FIG. 19 is a block diagram showing a wireless communication module 80 and a wireless communication device 85 of the fourth example of the embodiment of the present invention.
- the wireless communication module 80 of this example includes a baseband unit 81 that processes baseband signals, and an RF unit 82 that is connected to the baseband unit 81 and processes RF signals after modulation of the baseband signals and before demodulation. I have.
- the RF unit 82 includes the filter circuit 821 of the present invention described above, and an RF signal obtained by modulating a baseband signal or a signal other than the communication band in the received RF signal is attenuated by the filter circuit 821.
- a baseband IC 811 is disposed in the baseband unit 81, and an RF IC 822 is disposed between the filter circuit 821 and the baseband unit 81 in the RF unit 82. Note that another circuit may be interposed between these circuits.
- the wireless communication device 85 of this example that transmits and receives RF signals is configured.
- the filter circuit 821 of the present invention in which the attenuation is sufficiently secured in the frequency region between the two passbands is used. Since signals in one communication band can be filtered, it is possible to obtain a wireless communication module and a wireless communication device that are small and have good communication quality.
- the second bandpass filter 30 includes the 1 ⁇ 2 wavelength resonator
- the first bandpass filter 20 includes the 1 ⁇ 2 wavelength resonator. You may make it prepare.
- both the first band-pass filter 20 and the second band-pass filter 30 may include a half-wave resonator. However, from the viewpoint of miniaturization of the filter circuit, it is desirable that the number of half-wave resonators is small.
- a coaxial resonator or the like can be used in addition to a resonator using a strip line, a microstrip line, or the like.
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Abstract
Description
図1は、本発明の実施の形態の第1の例のフィルタ回路を示す等価回路図である。図2は、図1のフィルタ回路における第1のバンドパスフィルタ20を示す等価回路図である。図3は、図1のフィルタ回路における第2のバンドパスフィルタ30を示す等価回路図である。
1.共振器群に含まれる1/2波長共振器の数が1つ変化する度に、通過帯域外の周波数領域における位相が反転する。
2.共振器群において隣り合う共振器間の結合が主に誘導性であるところの数が1つ変化する度に、通過帯域外の周波数領域における位相が反転する。
3.入力端子と入力段の共振器との結合が主に容量性の場合と主に誘導性の場合とで、通過帯域外の周波数領域における位相が反転する。
4.出力端子と出力段の共振器との結合が主に容量性の場合と主に誘導性の場合とで、通過帯域外の周波数領域における位相が反転する。
5.共振器群を構成する共振器の数が1つ変化する度に、通過帯域よりも低周波側の周波数領域における位相が反転する。
6.バンドパスフィルタの通過特性において、複数のルートで伝達される信号同士の位相差によって形成される減衰極が通過帯域外に形成されている場合には、その減衰極の両側で位相が反転する。
7.共振器群において隣り合う共振器間の結合が主に容量性であるところの数は、通過帯域外の周波数領域における位相に影響を与えない。また、共振器群を構成する共振器の数は、通過帯域よりも高周波側の周波数領域における位相に影響を与えない。
図9は、本発明の実施の形態の第2の例のフィルタ回路を示す等価回路図である。図10は、図9のフィルタ回路における第1のバンドパスフィルタ20を示す等価回路図である。図11は、図9のフィルタ回路における第2のバンドパスフィルタ30を示す等価回路図である。
図15は、本発明の実施の形態の第3の例のフィルタ回路を示す等価回路図である。図16は、図15のフィルタ回路における第1のバンドパスフィルタ20を示す等価回路図である。なお、本例のフィルタ回路における第2のバンドパスフィルタ30は、図11に示した前述した実施の形態の第2の例の第2のバンドパスフィルタ30と素子値まで含めて全く同じであり、その電気特性は図14に示すものである。
図19は本発明の実施の形態の第4の例の無線通信モジュール80および無線通信機器85を示すブロック図である。
本発明は前述した実施の形態の例に限定されるものではなく、本発明の要旨を逸脱しない範囲において種々の変更,改良が可能である。
12:出力端子
20:第1のバンドパスフィルタ
30:第2のバンドパスフィルタ
21,31:入力段の共振器
22,32:出力段の共振器
Claims (3)
- 第1の周波数帯域を通過帯域とする第1のバンドパスフィルタと、前記第1の周波数帯域よりも周波数が高い第2の周波数帯域を通過帯域とする第2のバンドパスフィルタとが互いに並列に接続されて構成された、2つの通過帯域を有するフィルタ回路であって、
前記第1のバンドパスフィルタおよび前記第2のバンドパスフィルタの各々は、相互に結合して通過帯域を形成するように順次配列された複数の共振器からなる共振器群と、該共振器群の前記複数の共振器のうちの入力段の共振器に結合する入力端子と、前記共振器群の前記複数の共振器のうちの出力段の共振器に結合する出力端子とを少なくとも備え、
前記共振器群は一方端が短絡された1/4波長共振器および両端が開放された1/2波長共振器の少なくとも一方によって構成されており、
前記第1のバンドパスフィルタおよび前記第2のバンドパスフィルタの少なくとも一方の前記共振器群は、前記1/4波長共振器および前記1/2波長共振器の両方を有しており、
前記1/2波長共振器の一方端側は、隣接する前記入力端子側の共振器または前記入力端子に結合するとともに、前記1/2波長共振器の他方端側は、隣接する前記出力端子側の共振器または前記出力端子に結合しており、
前記第1のバンドパスフィルタにおいて、前記共振器群に含まれる前記1/2波長共振器の数が0または偶数のときはa=1,奇数のときはa=-1,隣り合う前記共振器間の結合が主に誘導性であるところの数が0または偶数のときはb=1,奇数のときはb=-1,前記入力段の共振器と前記入力端子との結合が主に容量性であるときはc=1,誘導性であるときはc=-1,前記出力段の共振器と前記出力端子との結合が主に容量性であるときはd=1,誘導性であるときはd=-1とし、
前記第1のバンドパスフィルタの通過特性において、前記第1の周波数帯域および前記第2の周波数帯域の間に位置する第3の周波数帯域と前記第1の周波数帯域との間の周波数領域に形成される、複数のルートで伝達される信号同士の位相差によって形成される減衰極の数が0または偶数のときはe=1,奇数のときはe=-1とし、
前記第2のバンドパスフィルタにおいて、前記共振器群に含まれる前記1/2波長共振器の数が0または偶数のときはf=1,奇数のときはf=-1,隣り合う前記共振器間の結合が主に誘導性であるところの数が0または偶数のときはg=1,奇数のときはg=-1,前記入力段の共振器と前記入力端子との結合が主に容量性であるときはh=1,誘導性であるときはh=-1,前記出力段の共振器と前記出力端子との結合が主に容量性であるときはj=1,誘導性であるときはj=-1,前記共振器群を構成する前記共振器の数が偶数のときはk=1,奇数のときはk=-1とし、
前記第2のバンドパスフィルタの通過特性において、前記第3の周波数帯域と前記第2の周波数帯域との間の周波数領域に、複数のルートで伝達される信号同士の位相差によって形成される減衰極の数が0または偶数のときはm=1,奇数のときはm=-1とすると、
a×b×c×d×e×f×g×h×j×k×m=-1を満足するように、前記第1のバンドパスフィルタの前記共振器群に含まれる前記1/2波長共振器の数および前記第2のバンドパスフィルタの前記共振器群に含まれる前記1/2波長共振器の数が定められていることを特徴とするフィルタ回路。 - 請求項1に記載のフィルタ回路を含むRF部と、該RF部に接続されたベースバンド部とを備えることを特徴とする無線通信モジュール。
- 請求項2に記載の無線通信モジュールと、前記RF部に接続されたアンテナとを備えることを特徴とする無線通信機器。
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US13/203,225 US8648674B2 (en) | 2009-02-25 | 2010-02-17 | Filter circuit, and wireless communication module and wireless communication device that uses the same |
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JPH08321738A (ja) * | 1995-05-24 | 1996-12-03 | Matsushita Electric Ind Co Ltd | 二周波数帯域通過フィルタ及び二周波数分波器及び二周波数合成器 |
JPH10242706A (ja) * | 1997-02-28 | 1998-09-11 | Taiyo Yuden Co Ltd | 誘電体共振器装置 |
WO2008038443A1 (fr) * | 2006-09-28 | 2008-04-03 | Murata Manufacturing Co., Ltd. | Filtre diélectrique, élément de circuit intégré et procédé de fabrication d'élément de circuit intégré |
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DE3835480A1 (de) * | 1988-10-18 | 1990-04-19 | Fraunhofer Ges Forschung | Hochfrequenz-bandpassfilter |
DE69615914T2 (de) | 1995-05-16 | 2002-04-04 | Matsushita Electric Ind Co Ltd | Funkübertragungsvorrichtung für Zeitmultiplex-Vielfachzugriffssystem |
JP3676885B2 (ja) | 1996-07-25 | 2005-07-27 | Tdk株式会社 | チップ型積層フィルタ |
DE69708104T2 (de) * | 1996-07-31 | 2002-07-11 | Matsushita Electric Ind Co Ltd | Mehrschichtiger zweiband-bandpassfilter |
CN1495963A (zh) * | 2002-08-30 | 2004-05-12 | ���µ�����ҵ��ʽ���� | 滤波器、高频模块、通信设备以及滤波方法 |
JP3866231B2 (ja) * | 2003-09-04 | 2007-01-10 | Tdk株式会社 | 積層型バンドパスフィルタ |
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JPH08321738A (ja) * | 1995-05-24 | 1996-12-03 | Matsushita Electric Ind Co Ltd | 二周波数帯域通過フィルタ及び二周波数分波器及び二周波数合成器 |
JPH10242706A (ja) * | 1997-02-28 | 1998-09-11 | Taiyo Yuden Co Ltd | 誘電体共振器装置 |
WO2008038443A1 (fr) * | 2006-09-28 | 2008-04-03 | Murata Manufacturing Co., Ltd. | Filtre diélectrique, élément de circuit intégré et procédé de fabrication d'élément de circuit intégré |
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