WO2022215353A1 - フィルタ装置およびそれを備えた高周波フロントエンド回路 - Google Patents
フィルタ装置およびそれを備えた高周波フロントエンド回路 Download PDFInfo
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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
- H03H7/0153—Electrical filters; Controlling thereof
- H03H7/0161—Bandpass filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/40—Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations
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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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
-
- 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
- H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
-
- 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
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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
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/1758—Series LC in shunt or branch path
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H2001/0021—Constructional details
- H03H2001/0085—Multilayer, e.g. LTCC, HTCC, green sheets
Definitions
- the present disclosure relates to a filter device and a high-frequency front-end circuit including the same, and more specifically to technology for improving the characteristics of a filter device configured with stacked LC resonators.
- Patent Document 1 discloses a filter device configured by a multi-stage laminated LC resonator.
- the filter device as described above is used, for example, in mobile terminals typified by mobile phones or smart phones, or in communication equipment such as personal computers having communication functions. There is still a strong demand for further miniaturization and thinning of these communication devices, and the electronic components used accordingly are also required to be miniaturized.
- a filter device In a filter device, it is generally desired to pass signals within the target passband with low loss and to have high attenuation characteristics for signals outside the passband. However, when further miniaturizing the filter device, there may be a case where sufficient attenuation characteristics outside the passband cannot be ensured.
- the present disclosure was made to solve the above problems, and the purpose thereof is to improve attenuation characteristics in a filter device including stacked LC resonators.
- a filter device includes a main body, an input terminal, an output terminal, a ground terminal, a first ground electrode, a second ground electrode, and a plurality of resonators.
- An input terminal, an output terminal and a ground terminal are provided on the body.
- the first ground electrode and the second ground electrode are arranged at different positions in the normal direction of the main body and connected to the ground terminal.
- a plurality of resonators are arranged between the first ground electrode and the second ground electrode in the normal direction and are electromagnetically coupled with each other.
- Each of the plurality of resonators includes a first capacitor electrode, a second capacitor electrode and a first via.
- the first capacitor electrode When the main body is viewed from the normal direction, the first capacitor electrode at least partially overlaps the first ground electrode, and the second capacitor electrode at least partially overlaps the second ground electrode.
- the first via connects the first capacitor electrode and the second capacitor electrode.
- the plurality of resonators includes a first resonator connected to the input terminal, a second resonator connected to the output terminal, and a third resonator arranged in a region between the first resonator and the second resonator. A resonator and a fourth resonator are included.
- the filter device has a second via arranged in a region between the third resonator and the fourth resonator when the main body is viewed from the normal direction, and connected to the first ground electrode and the second ground electrode. further provide.
- the filter device includes four resonators, and when the filter device is viewed from above, a ground A via (second via) connected to the electrode is arranged.
- the degree of coupling between resonators can be adjusted by this second via. Therefore, attenuation characteristics can be improved in a filter device including laminated resonators.
- FIG. 1 is a block diagram of a communication device having a high-frequency front-end circuit to which the filter device according to Embodiment 1 is applied;
- FIG. 2 is an equivalent circuit diagram of the filter device according to Embodiment 1.
- FIG. 1 is an external perspective view of a filter device according to Embodiment 1.
- FIG. 2 is an exploded perspective view showing the internal structure of the filter device according to Embodiment 1;
- FIG. 4 is a diagram for explaining the state of coupling between resonators in the filter device according to Embodiment 1;
- FIG. 4 is a diagram for explaining the state of coupling between resonators in the filter device according to the first embodiment;
- FIG. 4 is a diagram showing pass characteristics of the filter device according to the first embodiment and the filter device according to the comparative example;
- FIG. 6 is an exploded perspective view showing the structure of a filter device according to Embodiment 2;
- FIG. 1 is a block diagram of a communication device 10 having a high frequency front-end circuit 20 to which a filter device according to Embodiment 1 is applied.
- the communication device 10 is, for example, a mobile terminal typified by a smart phone, or a mobile phone base station.
- communication device 10 includes antenna 12, high-frequency front-end circuit 20, mixer 30, local oscillator 32, D/A converter (DAC) 40, and RF circuit 50. .
- High frequency front end circuit 20 also includes bandpass filters 22 and 28 , amplifier 24 and attenuator 26 .
- the high-frequency front-end circuit 20 includes a transmission circuit that transmits a high-frequency signal from the antenna 12 will be described. may contain
- the communication device 10 up-converts the signal transmitted from the RF circuit 50 into a high-frequency signal and radiates it from the antenna 12 .
- a modulated digital signal output from the RF circuit 50 is converted to an analog signal by the D/A converter 40 .
- the mixer 30 mixes the signal converted into the analog signal by the D/A converter 40 with the oscillation signal from the local oscillator 32 and up-converts it into a high frequency signal.
- a band-pass filter 28 removes unnecessary waves generated by the up-conversion and extracts only signals in a desired frequency band.
- Attenuator 26 adjusts the strength of the signal.
- Amplifier 24 power-amplifies the signal that has passed through attenuator 26 to a predetermined level.
- the band-pass filter 22 removes unwanted waves generated in the amplification process and allows only signal components in the frequency band specified by the communication standard to pass.
- a signal that has passed through the bandpass filter 22 is radiated from the antenna 12 as a transmission signal.
- a filter device corresponding to the present disclosure can be employed as the bandpass filters 22 and 28 in the communication device 10 as described above.
- FIG. 2 is an equivalent circuit diagram of the filter device 100 according to Embodiment 1.
- filter device 100 includes an input terminal T1 (IN), an output terminal T2 (OUT), inductors L1 and L2, and resonators RC10 to RC40.
- Each of resonators RC10-RC40 is an LC resonator including an inductor and a capacitor.
- Resonator RC10 is connected to input terminal T1 via inductor L1.
- Resonator RC20 is connected to output terminal T2 via inductor L2.
- Resonators RC30 and RC40 are arranged between resonator RC10 and resonator RC20.
- the resonator RC10 includes inductors L10, L13 and capacitors C11, C12.
- Inductor L10 includes series-connected inductors L11 and L12. One end of inductor L11 is connected to ground terminal GND via capacitor C11. One end of inductor L12 is connected to ground terminal GND via capacitor C12.
- Inductor L13 is connected between a connection node of inductors L11 and L12 and ground terminal GND.
- Capacitor C11 is connected to input terminal T1 via inductor L1.
- Inductor L1 is connected to ground terminal GND.
- the resonator RC20 includes inductors L20, L23 and capacitors C21, C22.
- Inductor L20 includes series-connected inductors L21 and L22. One end of inductor L21 is connected to ground terminal GND via capacitor C21. One end of inductor L22 is connected to ground terminal GND via capacitor C22.
- Inductor L23 is connected between a connection node of inductors L21 and L22 and ground terminal GND.
- Capacitor C21 is connected to output terminal T2 via inductor L2.
- Inductor L2 is connected to ground terminal GND.
- a filter device By connecting the input terminal T1 and the output terminal T2 to the ground terminal GND of the corresponding resonator, the high-frequency signal propagating between the resonators is excited in a TE (Transversal Electric) mode.
- TE Transversal Electric
- a filter device can be configured with a resonator having a high Q value.
- the resonator RC30 includes inductors L31 and L32 and capacitors C31 and C32. One end of inductor L31 is connected to ground terminal GND via capacitor C31. The other end of inductor L31 is connected to ground terminal GND via capacitor C32. Inductor L32 is connected in parallel with inductor L31. Inductors L31 and L32 are DC-insulated from ground terminal GND by capacitors C31 and C32.
- the resonator RC40 includes inductors L41, L42 and capacitors C41, C42. One end of inductor L41 is connected to ground terminal GND via capacitor C41. The other end of inductor L41 is connected to ground terminal GND via capacitor C42. Inductor L42 is connected in parallel with inductor L41. Inductors L41 and L42 are DC-insulated from ground terminal GND by capacitors C41 and C42.
- the filter device 100 has a configuration in which four stages of resonators that are electromagnetically coupled to each other are arranged between the input terminal T1 and the output terminal T2.
- a high-frequency signal input to the input terminal T1 is transmitted by electromagnetic field coupling of the resonators RC10 to RC40 and output from the output terminal T2.
- the filter device 100 functions as a bandpass filter that passes signals in a desired frequency band by adjusting the resonance frequency of each resonator.
- FIG. 3 is an external perspective view of the filter device 100.
- FIG. 4 is an exploded perspective view showing an example of the structure of the filter device 100.
- FIG. 4 is an exploded perspective view showing an example of the structure of the filter device 100.
- the filter device 100 includes a rectangular parallelepiped or substantially rectangular parallelepiped main body 110 formed by stacking a plurality of dielectric layers LY1 to LY7 along a predetermined direction.
- the direction in which the plurality of dielectric layers LY1 to LY7 are stacked is defined as the stacking direction.
- Each dielectric layer of main body 110 is made of ceramic such as low temperature co-fired ceramics (LTCC) or resin.
- LTCC low temperature co-fired ceramics
- a plurality of electrodes provided on each dielectric layer and a plurality of vias provided between the dielectric layers form inductors and capacitors for forming an LC resonant circuit.
- the term "via” refers to a conductor provided in a dielectric layer for connecting electrodes provided on different dielectric layers. Vias are formed, for example, by conductive paste, plating, and/or metal pins.
- the stacking direction of the main body 110 is defined as the “Z-axis direction,” the direction perpendicular to the Z-axis direction and along the long side of the main body 110 is defined as the “X-axis direction,” and the short direction of the main body 110 is defined as the “X-axis direction.”
- the positive direction of the Z-axis in each drawing may be referred to as the upper side
- the negative direction may be referred to as the lower side.
- a directional mark DM for specifying the direction of the filter device 100 is arranged on the upper surface 111 (dielectric layer LY1) of the main body 110 .
- An input terminal T1, an output terminal T2, and a ground terminal GND are arranged on the bottom surface 112 (dielectric layer LY7) of the main body 110 .
- Filter device 100 is connected to an external device using input terminal T 1 , output terminal T 2 and ground terminal GND arranged on lower surface 112 of main body 110 .
- Each of the input terminal T1, the output terminal T, and the ground terminal GND is a plate-shaped electrode.
- the ground terminal GND has a substantially H-shape with notches in the positive and negative directions of the X-axis.
- the input terminal T1 has a rectangular shape and is arranged inside the notch of the ground terminal GND in the negative direction of the X axis.
- the output terminal T2 has a rectangular shape and is arranged inside the notch in the positive direction of the X-axis of the ground terminal GND.
- a flat plate-shaped ground electrode PG1 having a rectangular shape is arranged on the dielectric layer LY2 of the main body 110 .
- a flat plate-shaped ground electrode PG2 is arranged on the dielectric layer LY6 of the main body 110 .
- the ground electrodes PG1 and PG2 are connected to a ground terminal GND provided on the dielectric layer LY7 by vias VG1 to VG5.
- the vias VG1 to VG4 are arranged at the four corners of the ground electrode PG1.
- the via VG5 is arranged substantially at the center of the ground electrode PG1.
- the ground electrode PG2 is connected to the input terminal T1 of the dielectric layer LY7 by a via VG1. Also, the ground electrode PG2 is connected to the output terminal T2 of the dielectric layer LY7 by a via VG2. Vias VG1 and VG2 form inductors L1 and L2 in FIG. 2, respectively.
- the filter device 100 includes four resonators RC10 to RC40, as described with reference to FIG. More specifically, resonator RC10 is composed of via V11, capacitor electrodes PC11 and PC12, and plate electrode P1.
- the resonator RC20 is composed of a via V21, capacitor electrodes PC21 and PC22, and a plate electrode P2.
- the resonator RC30 is composed of vias V31, V32 and capacitor electrodes PC31, PC32.
- the resonator RC40 is composed of vias V41, V42 and capacitor electrodes PC41, PC42.
- the capacitor electrode PC11 of the resonator RC10 is a rectangular flat plate electrode provided on the dielectric layer LY3. When viewed in plan from the normal direction (Z-axis direction) of the main body 110, a portion of the capacitor electrode PC11 overlaps the ground electrode PG1 provided on the dielectric layer LY2.
- the capacitor C11 in FIG. 2 is configured by the capacitor electrode PC11 and the ground electrode PG1.
- the capacitor electrode PC12 is a rectangular flat plate electrode provided on the dielectric layer LY5. When viewed from the normal direction of the main body 110, a portion of the capacitor electrode PC12 overlaps the ground electrode PG2 provided on the dielectric layer LY6.
- Capacitor C12 in FIG. 2 is configured by capacitor electrode PC12 and ground electrode PG2.
- the capacitor electrode PC11 is connected to the capacitor electrode PC12 by a via V11.
- the via V11 is also connected to the plate electrode P1 provided on the dielectric layer LY4.
- the plate electrode P1 has a substantially C-shape and is connected to the ground electrodes PG1 and PG2 and the ground terminal GND by vias VG1 and VG2.
- Vias V12 and V13 are connected to each end of the projecting portion of the flat plate electrode P1 in the substantially C shape.
- the vias V12 and V13 are connected to the ground electrode PG2 of the dielectric layer LY6 and the ground terminal GND of the dielectric layer LY7.
- the via V11 constitutes the inductor L10 in FIG.
- Inductor L13 in FIG. 2 is configured by plate electrode P1 and vias VG1, VG2, V12, and V13.
- the capacitor electrode PC21 of the resonator RC20 is a rectangular flat plate electrode provided on the dielectric layer LY3. When viewed from the normal direction of the main body 110, part of the capacitor electrode PC21 overlaps the ground electrode PG1 provided on the dielectric layer LY2.
- the capacitor C21 in FIG. 2 is configured by the capacitor electrode PC21 and the ground electrode PG1.
- the capacitor electrode PC22 is a rectangular plate electrode provided on the dielectric layer LY5. When viewed from the normal direction of the main body 110, a part of the capacitor electrode PC22 overlaps the ground electrode PG2 provided on the dielectric layer LY6.
- the capacitor C22 in FIG. 2 is configured by the capacitor electrode PC22 and the ground electrode PG2.
- the capacitor electrode PC21 is connected to the capacitor electrode PC22 by a via V21. Also, the via V21 is connected to the plate electrode P2 provided on the dielectric layer LY4.
- the plate electrode P2 has a substantially C shape and is connected to the ground electrodes PG1 and PG2 and the ground terminal GND by vias VG1 and VG2.
- Vias V22 and V23 are connected to each of the end portions of the projecting portion of the substantially C-shaped plate electrode P2.
- the vias V22 and V23 are connected to the ground electrode PG2 of the dielectric layer LY6 and the ground terminal GND of the dielectric layer LY7.
- the via V21 constitutes the inductor L20 in FIG.
- Inductor L23 in FIG. 2 is configured by plate electrode P2 and vias VG1, VG2, V22, and V23.
- the plate electrodes P1 and P2 By providing the plate electrodes P1 and P2 and connecting the input/output side resonators RC10 and RC20 to the ground terminal, there is an effect of generating an attenuation pole on the lower frequency side than the passband. Since the plate electrodes P1 and P2 are connected to the ground electrodes PG1 and PG2 and the ground terminal GND, the impedance on the low frequency side of the resonators RC10 and RC20 is reduced, and the via V11 connected in series to the capacitor electrodes PC12 and PC22. , V21 causes an attenuation pole on the low frequency side of the passband.
- the capacitor electrode PC31 of the resonator RC30 has a flat plate shape and is arranged in the region between the capacitor electrode PC11 and the capacitor electrode PC21 in the dielectric layer LY3. When viewed from the normal direction of the main body 110, a portion of the capacitor electrode PC31 overlaps the ground electrode PG1 arranged on the dielectric layer LY2.
- the capacitor C31 in FIG. 2 is configured by the capacitor electrode PC31 and the ground electrode PG1.
- the capacitor electrode PC32 has a flat plate shape and is provided on the dielectric layer LY5. When viewed from the normal direction of the main body 110, a portion of the capacitor electrode PC32 overlaps the ground electrode PG2 provided on the dielectric layer LY6.
- the capacitor C32 in FIG. 2 is configured by the capacitor electrode PC32 and the ground electrode PG2.
- the capacitor electrode PC31 is connected to the capacitor electrode PC32 by vias V31 and V32.
- the capacitor electrode PC41 of the resonator RC40 has a flat plate shape and is arranged in the region between the capacitor electrode PC11 and the capacitor electrode PC21 in the dielectric layer LY3.
- the capacitor electrode PC41 is arranged in the dielectric layer LY3 so as to face the capacitor electrode PC31 of the resonator RC30 in the Y-axis direction.
- a portion of the capacitor electrode PC41 overlaps the ground electrode PG1 arranged on the dielectric layer LY2.
- the capacitor C41 in FIG. 2 is configured by the capacitor electrode PC41 and the ground electrode PG1.
- the capacitor electrode PC42 has a flat plate shape, and is arranged in the dielectric layer LY5 so as to face the capacitor electrode PC32 of the resonator RC30 in the Y-axis direction. When viewed from the normal direction of the main body 110, a portion of the capacitor electrode PC42 overlaps the ground electrode PG2 arranged on the dielectric layer LY6.
- Capacitor C42 in FIG. 2 is configured by capacitor electrode PC42 and ground electrode PG2.
- the capacitor electrode PC41 is connected to the capacitor electrode PC42 by vias V41 and V42.
- the vias VG1, V12, V22, VG3 are arranged along the side surface of the main body 110 in the X-axis direction. Also, the vias VG2, V13, V23, and VG4 are arranged along the side surface of the main body 110 in the X-axis direction. In other words, the vias VG1 to VG4, V12, V13, V22, V23 are arranged along the outer circumference of the main body 110.
- the via VG5 is an area between the capacitor electrode PC11 of the resonator RC10 and the capacitor electrode PC21 of the resonator RC20, and is located between the capacitor electrode PC31 of the resonator RC30 and the resonator. It is arranged in a region between RC40 and capacitor electrode PC41.
- FIG. 5 is a diagram for explaining the state of coupling between resonators in the filter device 100.
- a high-frequency signal input to input terminal T1 passes through resonator RC10, resonator RC30, resonator RC40, and resonator RC20 along paths indicated by arrows AR1, AR2, and AR3 in FIG. They are transmitted in order and output from the output terminal T2.
- the high-frequency signal input to the input terminal T1 is also transmitted from the resonator RC10 to the resonator RC40 as indicated by the dashed arrow AR4 in FIG.
- the high frequency signal transmitted to the resonator RC30 is also transmitted to the resonator RC20 as indicated by the dashed arrow AR5 in FIG.
- An attenuation pole is generated by such a so-called interlaced coupling that bypasses a part of the main path.
- via VG5 connected to ground terminal GND is provided in the region between resonator RC10 and resonator RC20 and in the region between resonator RC30 and resonator RC40. are placed. This can ensure isolation between the input terminal T1 and the output terminal T2. Further, the degree of coupling between the resonators RC30 and RC40 is adjusted by the positions of the vias V31, V32, V41, V42 included in the resonators RC30 and RC40 and the via VG5.
- FIG. 6 is a diagram for explaining in more detail the coupling state between the resonator RC30 and the resonator RC40 in the filter device 100.
- FIG. FIG. 6 is a plan view of the dielectric layer LY3 in FIG. Referring to FIG. 6, as described above, via VG5 is arranged in the region between capacitor electrode PC31 of resonator RC30 and capacitor electrode PC41 of resonator RC40.
- the position of the via V31 in the X-axis direction is more negative than the position of the via VG5, and the position of the via V32 in the X-axis direction is more positive than the position of the via VG5.
- the position of the via V41 in the X-axis direction is more negative than the position of the via VG5, and the position of the via V42 in the X-axis direction is more positive than the position of the via VG5.
- the via VG5 is arranged in the region where the path connecting the via V31 and the via V42 and the path connecting the via V32 and the via V41 intersect. This arrangement cuts off or weakens the coupling between the via V31 and the via V42 and the coupling between the via V32 and the via V41 indicated by the dashed arrows AR23 and AR24 in FIG.
- the connection between via V31 and via V41 (arrow AR21) and the connection between via V32 and via V42 (arrow AR22) are not blocked by via VG5. That is, the coupling between resonator RC30 and resonator RC40 is weakened compared to the case where via VG5 is not arranged.
- the via VG5 is arranged on the path connecting the via V11 of the resonator RC10 and the via V21 of the resonator RC20. This cuts off the coupling between the resonator RC10 and the resonator RC20. Therefore, isolation between the resonator RC10 and the resonator RC20 can be ensured.
- the via VG5 does not necessarily have to be placed in the center of the main body 110, and can be placed at any position in the hatched region RG1 in FIG. 9 according to the required degree of coupling between the resonators. .
- FIG. 7 is a diagram showing pass characteristics of the filter device 100 of the first embodiment and pass characteristics of a comparative filter device in which the via VG5 is not provided.
- the horizontal axis indicates frequency
- the vertical axis indicates insertion loss.
- a solid line LN10 indicates the case of the filter device 100 of the first embodiment
- a dashed line LN11 indicates the case of the filter device of the comparative example.
- the attenuation at each attenuation pole is larger than in the comparative example, Also, an attenuation amount of about 50 dB or more can be secured on the high frequency side of the attenuation pole near 32.5 GHz.
- the degree of coupling between the resonators is adjusted by arranging the vias connected to the ground terminal between the resonators. be. Therefore, even when the distance between the resonators becomes narrow due to the downsizing of the filter device, the increase in the degree of coupling between the resonators is suppressed. Therefore, it is possible to secure the isolation between the input and output terminals in the filter device and to suppress the deterioration of the attenuation characteristic.
- the “ground electrodes PG1 and PG2" in Embodiment 1 respectively correspond to the “first ground electrode” and the “second ground electrode” in the present disclosure.
- Each of the “capacitor electrodes PC11, PC21, PC31, PC41” in Embodiment 1 corresponds to the "first capacitor electrode” in the present disclosure.
- Each of the “capacitor electrodes PC12, PC22, PC32, PC42” in the first embodiment corresponds to the “second capacitor electrode” in the present disclosure.
- Each of the “vias V11, V21, V31, V32, V41, V42" in Embodiment 1 corresponds to the "first via” in the present disclosure.
- FIG. 8 is an exploded perspective view showing the structure of the filter device 100A according to Embodiment 2.
- FIG. Filter device 100A is different in that two vias VG6 and VG7 are arranged in the region between resonator RC30 and resonator RC40 instead of via VG5 of filter device 100 of the first embodiment.
- FIG. 8 other configurations are the same as those of the filter device 100 of FIG. In the description of FIG. 8, the description of elements overlapping those of FIG. 4 will not be repeated.
- the via VG6 is arranged at a position offset from the center of the dielectric layer toward the input terminal T1 in the region between the resonator RC30 and the resonator RC40. Also, the via VG7 is arranged at a position offset from the center of the dielectric layer toward the output terminal T2 in the region between the resonator RC30 and the resonator RC40. Vias VG6 and VG7 are connected to ground electrodes PG1 and PG2 and ground terminal GND, respectively.
- FIG. 9 is a diagram for explaining the coupling state between the resonator RC30 and the resonator RC40 in the filter device 100A.
- 9 is a plan view of the dielectric layer LY3 in FIG. 8.
- FIG. 9 is a diagram for explaining the coupling state between the resonator RC30 and the resonator RC40 in the filter device 100A.
- 9 is a plan view of the dielectric layer LY3 in FIG. 8.
- vias VG6 and VG7 are arranged in a region between capacitor electrode PC31 of resonator RC30 and capacitor electrode PC41 of resonator RC40.
- the position of via VG6 in the X-axis direction is more negative than vias V31, V32, V41, and V42.
- the position of the via VG7 in the X-axis direction is more positive than the vias V31, V32, V41, and V42. Therefore, in the example of the filter device 100A, vias VG6 and VG7 provide coupling between resonator RC30 and resonator RC40, that is, coupling between via V31 and via V41 (arrow AR31), coupling between via V32 and via V41. (arrow AR32), via V31 and via V42 (arrow AR33), and via V32 and via V42 (arrow AR34) are hardly affected.
- the positions of the vias VG6 and VG7 are shifted toward the center from the position in FIG.
- the degree of coupling between the vias V31, V32, V41 and V42 is weakened by the presence of the vias. This makes it possible to increase the amount of attenuation in the non-passband.
- the positions of the vias VG6 and VG7 are appropriately selected depending on the desired pass characteristics (insertion loss in the pass band and attenuation in the non-pass band).
- the isolation between the input and output terminals can be secured and the attenuation characteristic can be improved. It is possible to suppress the decrease in By providing a plurality of vias, the coupling state between the resonators is adjusted more finely.
- vias VG6, VG7 in the second embodiment correspond to “second vias” in the present disclosure.
- FIG. 10 is an equivalent circuit diagram of the filter device 100B according to the third embodiment.
- Filter device 100B of the third embodiment differs from filter device 100 of the first embodiment in the connection position of input terminal T1 in resonator RC10 and the connection position of output terminal T2 in resonator RC20. .
- the description of elements that overlap with filter device 100 will not be repeated.
- the inductor L1 connected to the input terminal T1 is connected to the connection node between the capacitor C11 and the inductor L10 in the resonator RC10.
- the inductor L2 connected to the output terminal T2 is connected to the connection node between the capacitor C21 and the inductor L20 in the resonator RC20.
- the via V1 connected to the input terminal T1 in FIG. 4 is not connected to the ground electrode PG2, but is connected to the capacitor electrode PC12.
- the via V2 connected to the output terminal T2 is not connected to the ground electrode PG2, but is connected to the capacitor electrode PC22.
- vias connected to the ground terminal GND are arranged in the region between the resonators RC10 and RC20 and between the resonators RC30 and RC40.
- the degree of coupling between the resonators is adjusted. Therefore, it is possible to secure the isolation between the input and output terminals in the filter device and to suppress the deterioration of the attenuation characteristic.
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Abstract
Description
(通信装置の基本構成)
図1は、実施の形態1に係るフィルタ装置が適用される高周波フロントエンド回路20を有する通信装置10のブロック図である。通信装置10は、たとえば、スマートフォンに代表される携帯端末、あるいは、携帯電話基地局である。
次に、図2~図4を用いて、実施の形態1のフィルタ装置100の詳細な構成について説明する。
図7は、本実施の形態1のフィルタ装置100の通過特性、および、ビアVG5が設けられてない比較例のフィルタ装置の通過特性を示す図である。図7においては、横軸に周波数が示されており、縦軸には挿入損失が示されている。図7において、実線LN10は、本実施の形態1のフィルタ装置100の場合を示しており、破線LN11は比較例のフィルタ装置の場合を示している。
実施の形態2においては、共振器間の領域に、接地端子に接続された複数のビアが配置される場合について説明する。
図10は、実施の形態3に係るフィルタ装置100Bの等価回路図である。実施の形態3のフィルタ装置100Bにおいては、実施の形態1のフィルタ装置100と比較すると、共振器RC10における入力端子T1の接続位置、および、共振器RC20における出力端子T2の接続位置が異なっている。なお、フィルタ装置100Bにおいて、フィルタ装置100と重複する要素の説明は繰り返さない。
Claims (9)
- フィルタ装置であって、
本体と、
前記本体に設けられた入力端子、出力端子および接地端子と、
前記本体の法線方向の異なる位置に配置され、前記接地端子に接続された第1接地電極および第2接地電極と、
前記法線方向において前記第1接地電極と前記第2接地電極との間に配置され、互いに電磁界結合する複数の共振器とを備え、
前記複数の共振器の各々は、
前記法線方向から前記本体を平面視した場合に、前記第1接地電極と少なくとも一部が重なる第1キャパシタ電極と、
前記法線方向から前記本体を平面視した場合に、前記第2接地電極と少なくとも一部が重なる第2キャパシタ電極と、
前記第1キャパシタ電極と前記第2キャパシタ電極とを接続する第1ビアとを含み、
前記複数の共振器は、
前記入力端子に接続された第1共振器と、
前記出力端子に接続された第2共振器と、
前記第1共振器と前記第2共振器との間の領域に配置された第3共振器および第4共振器とを含み、
前記フィルタ装置は、
前記法線方向から前記本体を平面視した場合に、前記第3共振器と前記第4共振器との間の領域に配置され、前記第1接地電極および前記第2接地電極に接続された第2ビアをさらに備える、フィルタ装置。 - 前記第2ビアは、前記法線方向から前記本体を平面視した場合に、前記第1接地電極および前記第2接地電極が重なる領域に配置される、請求項1に記載のフィルタ装置。
- 前記法線方向から前記本体を平面視した場合に、前記第2ビアは、前記第1共振器の第1ビアと、前記第2共振器の第1ビアとを結ぶ経路上に配置されている、請求項1または2に記載のフィルタ装置。
- 前記第3共振器の第1ビアは、第1導体および第2導体を含み、
前記第4共振器の第1ビアは、第3導体および第4導体を含み、
前記第2ビアは、前記第1導体および前記第4導体を結ぶ経路と、前記第2導体および前記第3導体を結ぶ経路とが交差する領域に配置される、請求項1~3のいずれか1項に記載のフィルタ装置。 - 前記第3共振器の第1ビアは、第1導体および第2導体を含み、
前記第4共振器の第1ビアは、第3導体および第4導体を含み、
前記第2ビアは、第5導体および第6導体を含む、請求項1~3のいずれか1項に記載のフィルタ装置。 - 前記第1共振器に含まれるインダクタ、および、前記第2共振器に含まれるインダクタは、前記接地端子に接続される、請求項1~5のいずれか1項に記載のフィルタ装置。
- 前記入力端子および前記出力端子は、前記接地端子に接続される、請求項1~6のいずれか1項に記載のフィルタ装置。
- 前記本体において、前記本体の外周に沿って配置され、前記接地端子に電気的に接続された複数の第3ビアをさらに備える、請求項1~7のいずれか1項に記載のフィルタ装置。
- 請求項1~8のいずれか1項に記載のフィルタ装置を備えた、高周波フロントエンド回路。
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JP2023512845A JP7568070B2 (ja) | 2021-04-05 | 2022-02-15 | フィルタ装置およびそれを備えた高周波フロントエンド回路 |
US18/376,006 US20240030884A1 (en) | 2021-04-05 | 2023-10-03 | Filter device, and radio-frequency front end circuit provided with same |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2002057543A (ja) * | 2000-08-09 | 2002-02-22 | Murata Mfg Co Ltd | 積層型lc部品 |
WO2015059964A1 (ja) * | 2013-10-24 | 2015-04-30 | 株式会社村田製作所 | 複合lc共振器および帯域通過フィルタ |
WO2016152211A1 (ja) * | 2015-03-23 | 2016-09-29 | 株式会社村田製作所 | 帯域通過フィルタおよび積層型の帯域通過フィルタ |
WO2020031838A1 (ja) * | 2018-08-10 | 2020-02-13 | 株式会社村田製作所 | バンドパスフィルタ |
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2002057543A (ja) * | 2000-08-09 | 2002-02-22 | Murata Mfg Co Ltd | 積層型lc部品 |
WO2015059964A1 (ja) * | 2013-10-24 | 2015-04-30 | 株式会社村田製作所 | 複合lc共振器および帯域通過フィルタ |
WO2016152211A1 (ja) * | 2015-03-23 | 2016-09-29 | 株式会社村田製作所 | 帯域通過フィルタおよび積層型の帯域通過フィルタ |
WO2020031838A1 (ja) * | 2018-08-10 | 2020-02-13 | 株式会社村田製作所 | バンドパスフィルタ |
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