WO2022038726A1 - Résonateur et filtre à haute fréquence - Google Patents

Résonateur et filtre à haute fréquence Download PDF

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Publication number
WO2022038726A1
WO2022038726A1 PCT/JP2020/031361 JP2020031361W WO2022038726A1 WO 2022038726 A1 WO2022038726 A1 WO 2022038726A1 JP 2020031361 W JP2020031361 W JP 2020031361W WO 2022038726 A1 WO2022038726 A1 WO 2022038726A1
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conductor
dielectric substrate
inner layer
signal
resonator
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PCT/JP2020/031361
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English (en)
Japanese (ja)
Inventor
裕之 青山
秀憲 湯川
徹 高橋
雄丈 海野
傑 間木
幸宣 垂井
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三菱電機株式会社
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Priority to JP2022543205A priority Critical patent/JP7237247B2/ja
Priority to PCT/JP2020/031361 priority patent/WO2022038726A1/fr
Publication of WO2022038726A1 publication Critical patent/WO2022038726A1/fr

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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

Definitions

  • This disclosure relates to resonators and high frequency filters.
  • Patent Document 1 describes a bandpass filter including two or more resonators arranged between two input / output terminals in a laminated substrate composed of a plurality of dielectric layers.
  • each resonator is composed of a resonance line and a resonance capacitance connected to one end thereof, and the capacitive electrode and the resonance line forming the resonance capacitance are configured as a bandpass filter when viewed from the stacking direction. It is located in different dielectric layers via a planar ground electrode that covers the entire portion.
  • Patent Document 1 for example, in a transmission line which is a strip conductor having a length of less than a quarter effective wavelength, one end of the transmission line is loaded with a capacitance, and the other end is loaded.
  • Resonators shorted in are described.
  • basic resonance occurs at a frequency at which the length of the transmission line becomes a quarter effective wavelength, and the fundamental resonance occurs in the transmission line.
  • First-order spurious resonance occurs at frequencies where the length is three-quarters of the effective wavelength. Since the frequency ratio between the fundamental resonance and the first spurious resonance is 3, the first spurious resonance occurs at a frequency f s1 that is three times the fundamental resonance frequency f 0 .
  • the planar filter can attenuate unwanted waves over a wider frequency band, i.e., improve spurious characteristics.
  • a resonator that employs an electrode structure in which signal conductors and ground conductors are alternately arranged in the stacking direction (hereinafter referred to as electrode structure A) is known.
  • electrode structure A the effective electrode area of the capacitance can be increased while suppressing the increase in the occupied area of the capacitance, so that the value of the capacitance becomes large.
  • the electrode structure A In order to realize a larger capacitance value in the electrode structure A, it is necessary to increase the area of the signal conductor constituting the capacitance. However, when the size of the signal conductor constituting the capacitance becomes a size that cannot be ignored compared to the effective wavelength of the frequency used, the electrode structure A itself causes unnecessary resonance, and the spurious characteristics of the resonator deteriorate. There was a challenge.
  • the present disclosure solves the above problems, and an object of the present invention is to obtain a resonator capable of suppressing deterioration of spurious characteristics even if the size of the signal conductor is increased, and a high frequency filter using the resonator.
  • the resonator according to the present disclosure includes a dielectric substrate on which dielectrics are laminated, a first ground conductor provided on the first surface of the dielectric substrate, and a side opposite to the first surface of the dielectric substrate.
  • a second ground conductor provided on the second surface of the above, a plurality of strip-shaped signal conductors arranged in the stacking direction so as to overlap each other when viewed in a plane in the inner layer of the dielectric substrate, and an inner layer of the dielectric substrate.
  • one or more inner layer ground conductors alternately arranged with signal conductors in the stacking direction, a strip-shaped strip conductor provided in the inner layer of the dielectric substrate, and a first ground conductor provided in the inner layer of the dielectric substrate.
  • a plurality of first short-circuit conductors that electrically connect and short-circuit the second ground conductor and the inner layer ground conductor, and an end opposite to the end to which the first short-circuit conductor in the strip conductor is connected and a signal.
  • a first connecting conductor that electrically connects the ends of the conductor, a second connecting conductor that electrically connects the signal conductors at each end of the plurality of signal conductors, and a second connection conductor in the plurality of signal conductors.
  • Each end opposite to the end to which the connecting conductor is connected is provided with a third connecting conductor that electrically connects the signal conductors.
  • a plurality of strip-shaped signal conductors arranged in the stacking direction so as to overlap each other in a plan view in the inner layer of the dielectric substrate, and the signal conductors alternately arranged in the stacking direction in the inner layer of the dielectric substrate.
  • the one or more inner layer ground conductors, the strip conductor provided in the inner layer of the dielectric substrate, and the first ground conductor, the second ground conductor, and the inner layer ground conductor are electrically connected and short-circuited.
  • FIG. 1A is a plan view showing the resonator according to the first embodiment
  • FIG. 1B is a cross-sectional arrow showing a cross section of the resonator according to the first embodiment cut along the line AA of FIG. 1A. Is. It is a top view which shows the structure of each layer of the resonator which concerns on Embodiment 1.
  • FIG. 3A is a plan view showing a resonator without the third connecting conductor
  • FIG. 3B shows a cross section of the resonator without the third connecting conductor cut along the line BB of FIG. 3A. It is a cross-sectional arrow diagram.
  • FIG. 8A is a plan view showing the high frequency filter according to the second embodiment
  • FIG. 8B is a cross-sectional arrow showing a cross section of the high frequency filter according to the second embodiment cut along the line CC of FIG. 8A. Is.
  • FIG. 13A is a plan view showing the high frequency filter according to the third embodiment, and FIG.
  • FIG. 13B is a cross-sectional arrow showing a cross section of the high frequency filter according to the third embodiment cut along the line EE of FIG. 13A. Is. It is a top view which shows the structure of each layer of the high frequency filter which concerns on Embodiment 3. FIG. It is a graph which shows the analysis result of the amplitude characteristic of the high frequency filter which concerns on Embodiment 3.
  • FIG. 1A is a plan view showing the resonator 1 according to the first embodiment.
  • FIG. 1B is a cross-sectional arrow showing a cross section of the resonator 1 cut along the line AA of FIG. 1A.
  • FIG. 2 is a plan view showing the configuration of each layer of the resonator 1.
  • the resonator 1 includes a first ground conductor 2a, a second ground conductor 2b, a dielectric substrate 3, an inner layer ground conductor 4, a strip conductor 5, a signal conductor 6, and a first ground conductor. It includes a connecting conductor 7a, a second connecting conductor 7b, a third connecting conductor 7c, and a first short-circuit conductor 8.
  • the dielectric substrate 3 is a dielectric substrate on which dielectrics are laminated, and a first ground conductor 2a is provided on a first surface which is a main surface, and is a main surface opposite to the first surface.
  • a second ground conductor 2b is provided on the second surface.
  • the first ground conductor 2a is a solid pattern of the conductor on the first surface
  • the second ground conductor 2b is a solid pattern of the conductor on the second surface.
  • the first surface of the dielectric substrate 3 is the first layer
  • the second surface is the eighth layer, and between the first surface and the second surface. Has an inner layer from the third layer to the seventh layer.
  • the one or more inner layer ground conductors 4 are solid patterns of the first to nth conductors provided in the inner layer of the dielectric substrate 3. n is an integer of 1 or more.
  • the plurality of inner layer ground conductors 4 are the inner layer ground conductor 4a and the inner layer ground conductor 4b.
  • An opening pattern is formed in the inner layer ground conductor 4a and the inner layer ground conductor 4b so as not to conduct with the second connecting conductor 7b and the third connecting conductor 7c.
  • the strip conductor 5 is a strip-shaped conductor pattern provided in the inner layer of the dielectric substrate 3.
  • the strip conductor 5 functions as a strip transmission line arranged between the second ground conductor 2b and the inner layer ground conductor 4b.
  • the end of the strip conductor 5 is electrically connected to the first ground conductor 2a, the second ground conductor 2b, the inner layer ground conductor 4a, and the inner layer ground conductor 4b by the first short-circuit conductor 8. That is, the end portion of the strip conductor 5 has a ground potential.
  • the plurality of signal conductors 6 are strip-shaped conductor patterns from the first to the first (n + 1) th arranged in the inner layer of the dielectric substrate 3 in the stacking direction so as to overlap each other when viewed in a plane.
  • the plurality of signal conductors 6 are signal conductors 6a, 6b and 6c.
  • the signal conductors 6a, 6b, and 6c are arranged in the stacking direction so as to overlap each other when the dielectric substrate 3 is viewed in a plane.
  • the inner layer ground conductor 4a and the inner layer ground conductor 4b and the signal conductors 6a, 6b and 6c are alternately arranged in the stacking direction of the dielectric substrate 3. That is, as shown in FIG. 1B, in the resonator 1, in the dielectric substrate 3, the signal conductor 6a is arranged in the second layer, the inner layer ground conductor 4a is arranged in the third layer, and the signal conductor 6b is arranged in the fourth layer.
  • the electrode structure A functions as a capacitance of the lumped constant element.
  • the signal conductor 6a is provided on the second layer of the dielectric substrate 3, the second connecting conductor 7b is connected to one end, and the third connecting conductor is connected to the other end. 7c is connected.
  • the signal conductor 6b is provided on the fourth layer of the dielectric substrate 3, and like the signal conductor 6a, the second connecting conductor 7b is connected to one end and the third connecting conductor 7c is connected to the other end. Is connected.
  • the signal conductor 6c is provided on the sixth layer of the dielectric substrate 3, and like the signal conductors 6a and 6b, the second connecting conductor 7b is connected to one end and the third connection is connected to the other end. The conductor 7c is connected.
  • the first connecting conductor 7a is a via conductor that electrically connects the end of the strip conductor 5 opposite to the end connected to the first short-circuit conductor 8 and the end of the signal conductor 6c.
  • the second connecting conductor 7b is a via conductor that electrically connects the signal conductors at the respective ends of the signal conductors 6a, 6b, and 6c.
  • the third connecting conductor 7c is a via conductor that electrically connects the signal conductors at the end of the signal conductors 6a, 6b and 6c opposite to the end to which the second connecting conductor 7b is connected.
  • the first short-circuit conductor 8 is provided in the inner layer of the dielectric substrate 3, and electrically connects and short-circuits the first ground conductor 2a, the second ground conductor 2b, the inner layer ground conductor 4a, and the inner layer ground conductor 4b. It is a via conductor. As shown in FIG. 2, in the dielectric substrate 3, the plurality of first short-circuit conductors 8 are arranged so as to surround the strip conductor 5, the signal conductors 6a, 6b, and 6c when viewed in a plane.
  • FIG. 3A is a plan view showing a resonator 100 without a third connecting conductor 7c
  • FIG. 3B is a cross-sectional arrow showing a cross section of the resonator 100 cut along the line BB of FIG. 3A. be.
  • FIG. 4 is a plan view showing the configuration of each layer of the resonator 100.
  • the resonator 100 includes a first ground conductor 101a, a second ground conductor 101b, a dielectric substrate 102, an inner layer ground conductor 103, a strip conductor 104, a signal conductor 105, a first connecting conductor 106a, and a second connecting conductor 106b. And a first short-circuit conductor 107.
  • the first ground conductor 101a is a solid pattern of a conductor provided on the first surface of the dielectric substrate 102
  • the second ground conductor 101b is the dielectric substrate 102. It is a solid pattern of a conductor provided on the second surface of the above.
  • the inner layer ground conductor 103 is a solid pattern of the first to nth conductors provided in the inner layer of the dielectric substrate 102.
  • the plurality of inner layer ground conductors 103 are the inner layer ground conductor 103a and the inner layer ground conductor 103b.
  • An opening pattern is formed in the inner layer ground conductor 103a and the inner layer ground conductor 103b so as not to conduct with the second connecting conductor 106b.
  • the strip conductor 104 is a strip-shaped conductor pattern provided in the inner layer of the dielectric substrate 102.
  • the strip conductor 104 functions as a strip transmission line arranged between the second ground conductor 101b and the inner layer ground conductor 103b.
  • the end of the strip conductor 104 is electrically connected to the first ground conductor 101a, the second ground conductor 101b, the inner layer ground conductor 103a, and the inner layer ground conductor 103b by the first short-circuit conductor 107. That is, the end of the strip conductor 104 has a ground potential.
  • the plurality of signal conductors 105 are strip-shaped conductor patterns from the first to the first (n + 1) th arranged in the inner layer of the dielectric substrate 102 in the stacking direction so as to overlap each other when viewed in a plane.
  • the plurality of signal conductors 105 are signal conductors 105a, 105b and 105c.
  • the signal conductors 105a, 105b, and 105c are arranged in the stacking direction so as to overlap each other when the dielectric substrate 102 is viewed in a plane.
  • the inner layer ground conductor 103a and the inner layer ground conductor 103b and the signal conductors 105a, 105b and 105c are alternately arranged in the stacking direction of the dielectric substrate 3. That is, as shown in FIG. 3B, in the resonator 100, the signal conductor 105a is arranged on the second layer and the inner layer ground conductor 103a is arranged on the third layer in the dielectric substrate 102, similarly to the resonator 1. It has an electrode structure A in which the signal conductor 105b is arranged in the fourth layer, the inner layer ground conductor 103b is arranged in the fifth layer, and the signal conductor 105c is arranged in the sixth layer.
  • the resonator 1 is characterized in that the electrode structure A includes a third connecting conductor 7c. On the other hand, the resonator 100 does not have a component corresponding to the third connecting conductor 7c.
  • FIG. 5 is a circuit diagram showing an equivalent circuit of the resonator 100. When the electrode structure A is regarded as the capacitance of the lumped constant element, the equivalent circuit of the resonator 100 is expressed as a circuit in which the transmission line 200 and the capacitor 201 are connected at the connection point 202 as shown in FIG.
  • the input admittance Y in A seen from the connection point 202 on the transmission line 200 side is represented by the following equation (1).
  • the input admittance Y inB seen from the connection point 202 on the capacitor 201 side is represented by the following equation (2).
  • Y is the characteristic admittance of the transmission line 200
  • ⁇ is the electrical length of the transmission line 200
  • C is the capacitance of the capacitor 201.
  • Y inA jYcot ⁇ ⁇ ⁇ ⁇ (1)
  • Y inB j ⁇ C ⁇ ⁇ ⁇ (2)
  • the range that the electric length ⁇ 0 can take is 0 ⁇ 0 ⁇ / 4
  • the range that the electric length ⁇ s1 can take is ⁇ / 2 ⁇ . s1 ⁇ 3 ⁇ / 4. Therefore, by loading the capacitance C, the fundamental resonance frequency f 0 and the first spurious resonance frequency f s 1 become lower than the original frequency. Further, when the value of C / Y is increased, ⁇ 0 asymptotes to 0 and ⁇ s 1 asymptotes to ⁇ / 2. Therefore, the frequency ratio ( fs1 / f 0 ) between the basic resonance frequency f 0 and the first spurious resonance frequency f s1 becomes larger than 3, and the spurious characteristics are improved.
  • the electrode structure A cannot be regarded as the capacitance of the lumped constant. Therefore, a resonator designed by regarding the electrode structure A as a capacitance of a lumped constant at a basic resonance frequency f 0 is compared with a resonator designed so that the electrode structure A functions as a transmission line in a high frequency band.
  • the spurious characteristics may deteriorate. In particular, at frequencies where the lengths of the signal conductors 105a, 105b and 105c are close to a quarter wavelength, two of the signal conductors 105a, 105b and 105c operate as half-wavelength resonators with both ends open. However, the spurious characteristics deteriorate.
  • FIG. 6 is a graph showing the analysis result of the resonance frequency of the resonator 100.
  • the horizontal axis is the length dl of the electrode in the electrode structure A.
  • the electrodes in the electrode structure A are a signal conductor 105a, an inner layer ground conductor 103a, a signal conductor 105b, an inner layer ground conductor 103b, and a signal conductor 105c.
  • the electrode length dl is a length standardized by the effective wavelength at the basic resonance frequency f0 when the length of these conductors in the longitudinal direction is 0.
  • the first vertical axis is the fundamental resonance frequency f 0 and the first spurious resonance frequency f s1
  • the second vertical axis is the frequency ratio between the fundamental resonance frequency f 0 and the first spurious resonance frequency f s1 ( f s1 / f 0 ) is shown.
  • the value of the frequency ratio ( fs1 / f0 ) gradually decreases. Therefore, when the value of the length dl of the electrode is increased in the resonator 100, the ratio between the basic resonance frequency f 0 and the first spurious resonance frequency f s1 becomes smaller, that is, the spurious characteristics deteriorate.
  • the number of signal conductors in the electrode structure A is required to realize a larger capacitance. Need to be increased. However, in order to increase the number of signal conductors, it is necessary to increase the number of conductor layers of the dielectric substrate 102, which increases the manufacturing cost of the dielectric substrate 102. Further, the resonance at the lowest frequency generated in the electrode structure A is a half wavelength resonance caused by the path length of the high frequency current becoming a half wavelength.
  • the open ends of the signal conductors 6a, 6b, and 6c are short-circuited by connecting the third connecting conductor 7c.
  • the half-waver resonance with both ends open which has occurred in the signal conductors 105a, 105b and 105c of the resonator 100, so that the first spurious resonance frequency fs1 is set to a higher frequency band. It is possible to shift.
  • the signal conductors 6a, 6b, and 6c constituting the electrode structure A have the same potential. Therefore, even if the ends of the signal conductors 6a, 6b, and 6c are short-circuited with each other by the third connecting conductor 7c, the resonance frequency of the electrode structure A does not change. Therefore, the resonator 1 sets the first spurious resonance frequency f s1 to a higher frequency band while the occupied area required for fundamental resonance at a target frequency is the same as that of the resonator 100. Because it can be done, the spurious characteristics are improved.
  • the operation of the resonator 1 at the fundamental resonance frequency f0 is the same as that of the resonator 100. That is, in the resonator 1, fundamental resonance occurs in the range where the electrical length ⁇ of the strip conductor 5 is ⁇ ⁇ / 4.
  • the electrical length ⁇ k of the signal conductors 6a, 6b and 6c has a relationship of ⁇ k ⁇ and ⁇ k + ⁇ ⁇ / 4 with the electrical length ⁇ of the strip conductor 5.
  • the electrical lengths ⁇ k of the signal conductors 6a, 6b and 6c are equal to each other, and the electrical length ⁇ k is smaller than the electrical length ⁇ of the strip conductor 5.
  • ⁇ k + ⁇ which is the sum of the electrical lengths of the signal conductor 6 and the strip conductor 5, is not less than a quarter effective wavelength at the fundamental resonance frequency f 0 .
  • FIG. 7 is a graph showing the analysis result of the resonance frequency of the resonator 1.
  • the horizontal axis is the length dl of the electrode in the electrode structure A.
  • the electrodes in the electrode structure A are a signal conductor 6a, an inner layer ground conductor 4a, a signal conductor 6b, an inner layer ground conductor 4b, and a signal conductor 6c.
  • the electrode length dl is a length standardized by the effective wavelength at the basic resonance frequency f0 when the length of these conductors in the longitudinal direction is 0.
  • the first vertical axis is the fundamental resonance frequency f 0 and the first spurious resonance frequency f s1
  • the second vertical axis is the frequency ratio between the fundamental resonance frequency f 0 and the first spurious resonance frequency f s1 ( f s1 / f 0 ) is shown.
  • the fundamental resonance frequency f 0 decreases monotonically, and the frequency ratio between the fundamental resonance frequency f 0 and the first spurious resonance frequency f s1 (f s1 / f 0 ). ) Increases monotonically in the range of 0 ⁇ dl ⁇ 0.07. Comparing the analysis result of FIG. 6 with the analysis result of FIG. 7, the spurious characteristic of the resonator 1 is improved in the range of 0.025 ⁇ dl ⁇ 0.07.
  • the resonator 1 includes the signal conductors 6a, 6b and 6c arranged in the stacking direction so as to overlap each other in the inner layer of the dielectric substrate 3 when viewed in a plane, and the dielectric substrate.
  • the inner layer ground conductors 4a and 4b alternately arranged with the signal conductors 6a, 6b and 6c in the stacking direction, the strip-shaped strip conductor 5, the first ground conductor 2a, the second ground conductor 2b and the inner layer.
  • the first short-circuit conductor 8 that electrically connects and short-circuits the ground conductors 4a and 4b, the end of the strip conductor 5 opposite to the end to which the first short-circuit conductor 8 is connected, and the signal conductors 6a and 6b.
  • a first connecting conductor 7a that electrically connects the ends of the and 6c
  • a second connecting conductor that electrically connects the signal conductors at the ends of the signal conductors 6a, 6b and 6c
  • 6b and 6c include a third connecting conductor 7c that electrically connects the signal conductors at the end opposite to the end to which the second connecting conductor 7b is connected.
  • the resonator 1 having these components can suppress deterioration of spurious characteristics even if the sizes of the signal conductors 6a, 6b and 6c are increased.
  • the resonator 100 if the value of the electrode length dl is increased in order to increase the capacitance C of the electrode structure A, the spurious characteristics deteriorate.
  • the resonator 100 sets the length dl of the electrode to a quarter wavelength or less, and the number of signal conductors in the electrode structure A, that is, the dielectric. It was necessary to increase the number of layers of the body substrate 102. Therefore, miniaturization is restricted.
  • spurious characteristics are less likely to deteriorate even if the value of the electrode length dl is increased, and excellent spurious characteristics can be realized without increasing the number of layers of the dielectric substrate 3. ..
  • FIG. 8A is a plan view showing the high frequency filter 9 according to the second embodiment.
  • FIG. 8A shows a first ground conductor 2a that is partially transparent.
  • FIG. 8B is a cross-sectional arrow showing a cross section of the high frequency filter 9 cut along the line CC of FIG. 8A.
  • FIG. 9 is a plan view showing the configuration of each layer of the high frequency filter 9.
  • the high frequency filter 9 includes a first ground conductor 2a, a second ground conductor 2b, a dielectric substrate 3, a resonator group 10, an input terminal 11a, an output terminal 11b, and a first ground conductor.
  • a connection portion 12a and a second connection portion 12b are provided.
  • the resonator group 10 is composed of m resonators 1. m is an integer of 2 or more.
  • the resonator group 10 comprises resonators 1a, 1b, 1c and 1e.
  • the resonators 1a, 1b, 1c and 1e have the same structure as the resonator 1 described in the first embodiment. That is, the resonators 1a, 1b, 1c and 1e have a common first ground conductor 2a, a common second ground conductor 2b, and a common inner layer ground conductors 4a and 4b.
  • the resonators 1a, 1b, 1c and 1e individually have a strip conductor 5, a signal conductor 6a, 6b and 6c, a first connecting conductor 7a, a second connecting conductor 7b and a third connecting conductor 7c.
  • the strip conductor 5 included in the resonators 1a, 1b, 1c and 1e has an end portion on the same side and the first short-circuit conductor 8 connected to each other, and has a comb shape when viewed in a plane. ..
  • the resonators 1a, 1b, 1c and 1e are arranged side by side on the common dielectric substrate 3 as shown in FIG. 8A.
  • the adjacent resonators are arranged close to each other so as to be electromagnetically coupled. That is, in the arrangement of the resonators 1a, 1b, 1c and 1e, two adjacent resonators are electromagnetically coupled to each other.
  • the input terminal 11a is a terminal for inputting a high frequency signal to the high frequency filter 9, and the output terminal 11b is a terminal for outputting a high frequency signal from the high frequency filter 9.
  • the first connecting portion 12a electrically connects the strip conductor 5 of the resonator 1a arranged at the end of the arrangement of the resonators 1a, 1b, 1c and 1e in the dielectric substrate 3 and the input terminal 11a.
  • the second connecting portion 12b is a strip conductor of the resonator 1e arranged at the end of the arrangement of the resonators 1a, 1b, 1c and 1e opposite to the resonator 1a to which the first connecting portion 12a is connected. 5 and the output terminal 11b are electrically connected.
  • the first short-circuit conductor 8 is provided in the inner layer of the dielectric substrate 3, and electrically connects and short-circuits the first ground conductor 2a, the second ground conductor 2b, the inner layer ground conductor 4a, and the inner layer ground conductor 4b. It is a via conductor. As shown in FIG. 8A, in the dielectric substrate 3, the plurality of first short-circuit conductors 8 are arranged so as to surround the resonator group 10 when viewed in a plane.
  • the high frequency filter 9 has a function of filtering a high frequency signal input to the input terminal 11a and outputting a target high frequency signal from the output terminal 11b to reflect a high frequency signal other than the target signal to the input terminal 11a. ..
  • the high frequency filter 9 is provided in a communication device or a radar device, an antenna, an active circuit, and a passive circuit are connected to the input terminal 11a and the output terminal 11b.
  • the high frequency filter 9 removes spurious frequency components generated in the active circuit, or removes frequency components other than the target signal received by the antenna.
  • the spurious characteristic is mainly the spurious characteristic of the resonator itself that constitutes the filter, or is not intended to occur inside the dielectric substrate 3.
  • the propagation path determines the amount of coupling when the input terminal 11a and the output terminal 11b are coupled.
  • the spurious characteristic of the high frequency filter 9 is determined by the spurious characteristic of the resonator alone.
  • FIG. 10 is a graph showing the analysis result of the amplitude characteristic of the high frequency filter 9.
  • the horizontal axis is the normalized frequency standardized by the central frequency of the high frequency filter 9, and the vertical axis shows the amplitude value (dB) of the passing amplitude.
  • the passing amplitude is attenuated in a wide frequency band up to the first spurious resonance that occurs when the normalized frequency is around 6.8.
  • FIG. 9 shows the high frequency filter 9 in which the resonators 1a, 1b, 1c and 1e are arranged so that the ends of the strip conductor 5 connected to the first short-circuit conductor 8 are in the same direction.
  • the resonators may be electrically connected to each other by electromagnetic field coupling.
  • FIG. 11A is a plan view showing a high frequency filter 9A which is a modification of the high frequency filter 9 according to the second embodiment.
  • FIG. 11A shows a first ground conductor 2a that is partially transparent.
  • FIG. 11B is a cross-sectional arrow showing a modified example of the high frequency filter 9A cut along the DD line of FIG. 11A.
  • FIG. 12 is a plan view showing the configuration of each layer of the high frequency filter 9A.
  • the strip conductors 5 included in the resonators 1a, 1c, and 1d are planar in which the ends on the same side and the first short-circuit conductor 8 are connected. It looks like a comb.
  • the strip conductor 5 included in the resonators 1b and 1e has a comb shape when viewed in a plane, in which the end portion on the same side and the first short-circuit conductor 8 are connected.
  • the comb-shaped strip conductor 5 of the resonators 1a, 1c and 1d and the comb-shaped strip conductor 5 of the resonators 1b and 1e are connected to the first connecting conductor 7a as shown in FIG. The edges are staggered.
  • the resonators are electrically connected to each other by electromagnetic field coupling.
  • the first ground conductor 2a, the second ground conductor 2b, the dielectric substrate 3, the resonator group 10, the input terminal 11a, the output terminal 11b, and the first The connection portion 12a and the second connection portion 12b of the above are provided.
  • the resonators 1a, 1b, 1c and 1e constituting the resonator group 10 are arranged side by side on the common dielectric substrate 3, and the adjacent resonators are arranged close to each other so as to be electromagnetically coupled.
  • the first connecting portion 12a electrically connects the strip conductor 5 of the resonator 1a arranged at the end of the arrangement of the resonators 1a, 1b, 1c and 1e in the dielectric substrate 3 and the input terminal 11a.
  • the second connecting portion 12b is a strip conductor of the resonator 1e arranged at the end of the arrangement of the resonators 1a, 1b, 1c and 1e opposite to the resonator 1a to which the first connecting portion 12a is connected. 5 and the output terminal 11b are electrically connected.
  • FIG. 13A is a plan view showing the high frequency filter 9B according to the third embodiment.
  • FIG. 13A shows a first ground conductor 2a that is partially transparent.
  • FIG. 13B is a cross-sectional arrow showing a cross section of the high frequency filter 9B cut along the line EE of FIG. 13A.
  • FIG. 14 is a plan view showing the configuration of each layer of the high frequency filter 9B. As shown in FIGS.
  • the high frequency filter 9B includes a first ground conductor 2a, a second ground conductor 2b, a dielectric substrate 3, a resonator group 10, an input terminal 11a, an output terminal 11b, and a first ground conductor. It includes a connecting portion 12a, a second connecting portion 12b, and a plurality of second short-circuit conductors 13.
  • the resonator group 10 is composed of m resonators 1.
  • the resonator group 10 comprises resonators 1a, 1b, 1c and 1e.
  • the resonators 1a, 1b, 1c and 1e have the same structure as the resonator 1 described in the first embodiment.
  • the resonators 1a, 1b, 1c and 1e have a common first ground conductor 2a, a common second ground conductor 2b, a common inner layer ground conductor 4a and a common inner layer ground conductor 4b, and Each of the resonators 1a, 1b, 1c and 1e individually has a strip conductor 5, a signal conductor 6a, 6b and 6c, a first connecting conductor 7a, a second connecting conductor 7b and a third connecting conductor 7c.
  • the resonators 1a, 1b, 1c and 1e are arranged side by side on the common dielectric substrate 3 as shown in FIG. 13A.
  • the adjacent resonators are arranged close to each other so as to be electromagnetically coupled. That is, in the arrangement of the resonators 1a, 1b, 1c and 1e, two adjacent resonators are electromagnetically coupled to each other.
  • the input terminal 11a is a terminal for inputting a high frequency signal to the high frequency filter 9B
  • the output terminal 11b is a terminal for outputting a high frequency signal from the high frequency filter 9B.
  • the first connecting portion 12a electrically connects the resonator 1a arranged at the position of one end of the arrangement of the resonators 1a, 1b, 1c and 1e on the dielectric substrate 3 and the input terminal 11a. ..
  • the second connecting portion 12b electrically connects the resonator 1e arranged at the position of the other end of the arrangement of the resonators 1a, 1b, 1c, and 1e to the output terminal 11b.
  • the first short-circuit conductor 8 is provided in the inner layer of the dielectric substrate 3, and electrically connects and short-circuits the first ground conductor 2a, the second ground conductor 2b, the inner layer ground conductor 4a, and the inner layer ground conductor 4b. It is a via conductor. As shown in FIG. 13A, in the dielectric substrate 3, the plurality of first short-circuit conductors 8 are arranged so as to surround the resonator group 10 when viewed in a plane.
  • the plurality of second short-circuit conductors 13 are the second short-circuit conductors 13a, 13b, 13c and 13d.
  • the second short-circuit conductors 13a, 13b, 13c and 13d are arranged between the resonators adjacent to each other in a plan view on the dielectric substrate 3, respectively, and the first ground conductor 2a, the second ground conductor 2b and the inner layer are arranged.
  • the ground conductors 4a and 4b are electrically connected to each other and short-circuited.
  • the second short-circuit conductor 13 is connected to the first ground conductor 2a and the second ground conductor 2b, and among the plurality of inner layer ground conductors 4, the inner layer ground conductors 4 between the nearest layers of the dielectric substrate 3 are connected to each other. By connecting to, these are short-circuited.
  • the spurious characteristics may deteriorate due to the electromagnetic wave propagating from the input terminal to the output terminal inside the dielectric substrate provided with the resonator.
  • the dielectric substrate can be regarded as a dielectric medium whose side surfaces are covered with metal, and electromagnetic waves propagate through the dielectric medium as a waveguide. Therefore, by short-circuiting the two surfaces of the waveguide, unnecessary propagation of electromagnetic waves can be suppressed.
  • an electromagnetic wave propagates at a frequency in which the long side of the cross section perpendicular to the propagation direction is at least one half wavelength in the rectangular waveguide.
  • the plurality of first short-circuit conductors 8 and the plurality of second short-circuit conductors 13 are 2 at the highest frequency in the frequency band in which the shortest distance between any two short-circuit conductors is designed for spurious characteristics in the dielectric substrate 3. It is placed at a position that is less than a fraction of the effective frequency.
  • the spacing between the adjacent second short-circuit conductors 13 and the spacing between the first short-circuit conductor 8 and the second short-circuit conductor 13 is 4 minutes at the highest frequency in the decay frequency band of the high frequency filter 9B. It is 1 effective wavelength or less. This is just an example.
  • the first short-circuit conductor 8 and the second short-circuit conductor 13 are arranged at high density inside the dielectric substrate 3.
  • the second short-circuit conductor 13 provided between the resonators suppresses the unnecessary propagation of electromagnetic waves inside the dielectric substrate 3, so that the amount of electromagnetic wave attenuation in the blocking band is improved. Is possible.
  • FIG. 15 is a graph showing the analysis result of the amplitude characteristic of the high frequency filter 9B, and also shows the analysis result of the amplitude characteristic of the high frequency filter 9 for comparison with the amplitude characteristic of the high frequency filter 9B.
  • the horizontal axis is the normalized frequency standardized by the central frequency of the high frequency filter 9B, and the vertical axis shows the amplitude value (dB) of the passing amplitude.
  • the amplitude characteristic of the high frequency filter 9 is a curve of a broken line with a reference numeral F1
  • the amplitude characteristic of the high frequency filter 9B is a curve of a solid line with a reference numeral F2.
  • the amplitude characteristic of the high frequency filter 9B As for the amplitude characteristic of the high frequency filter 9B, a larger attenuation amount can be obtained on the high frequency side of the pass band as compared with the amplitude characteristic of the high frequency filter 9. That is, by providing the second short-circuit conductor 13 in the high-frequency filter 9B, unnecessary propagation of electromagnetic waves in the dielectric substrate 3 can be reduced, and more excellent attenuation characteristics can be realized.
  • the high frequency filter 9B is arranged between the resonators adjacent to each other in a plan view on the dielectric substrate 3, and the first ground conductor 2a and the second ground conductor 2a are respectively arranged.
  • a second short-circuit conductor 13 is provided which electrically connects 2b, the inner layer ground conductor 4a, and the inner layer ground conductor 4b to each other to short-circuit them.
  • the resonator according to the present disclosure can be used, for example, for a high frequency filter used in a microwave band or a millimeter wave band.
  • 1,1a-1e resonator 2a first ground conductor, 2b second ground conductor, 3 dielectric substrate, 4,4a, 4b inner layer ground conductor, 5 strip conductor, 6,6a, 6b, 6c signal conductor, 7a 1st connection conductor, 7b 2nd connection conductor, 7c 3rd connection conductor, 8 1st short circuit conductor, 9,9A, 9B high frequency filter, 10 resonator group, 11a input terminal, 11b output terminal, 12a 1st connection part, 12b 2nd connection part, 13, 13a, 13b, 13c, 13d 2nd short-circuit conductor, 100 resonator, 101a 1st ground conductor, 101b 2nd ground conductor, 102 dielectric substrate , 103 inner layer conductor, 103a inner layer conductor, 103b inner layer conductor, 104 strip conductor, 105, 105a, 105b, 105c signal conductor, 106a first connection conductor, 106b second connection conductor, 107 first short circuit

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Abstract

La présente invention concerne un résonateur (1) qui comprend : des conducteurs de signaux (6a, 6b, et 6c) disposés dans une direction d'empilement de manière à se chevaucher dans une vue en plan, dans des couches internes d'un substrat diélectrique (3); des conducteurs de masse de couche interne (4a et 4b) disposés en alternance avec les conducteurs de signaux (6a, 6b, et 6c) dans la direction d'empilement, dans des couches internes du substrat diélectrique (3); une piste conductrice en forme de bande (5); un premier conducteur de court-circuitage (8) qui connecte électriquement et court-circuite un premier conducteur de masse (2a), un deuxième conducteur de masse (2b), et les conducteurs de masse de couche interne (4a et 4b); un premier conducteur de connexion (7a) connectant électriquement une partie d'extrémité de la piste conductrice (5) et des parties d'extrémité des conducteurs de signaux (6a, 6b, et 6c); un deuxième conducteur de connexion (7b) connectant électriquement les conducteurs de signaux (6a, 6b, et 6c) ensemble au niveau des parties d'extrémité des conducteurs de signaux; et un troisième conducteur de connexion (7c) connectant électriquement les conducteurs de signaux (6a, 6b, et 6c) ensemble au niveau des parties d'extrémité des conducteurs de signaux sur le côté opposé aux parties d'extrémité auxquelles le deuxième conducteur de connexion (7b) est connecté.
PCT/JP2020/031361 2020-08-20 2020-08-20 Résonateur et filtre à haute fréquence WO2022038726A1 (fr)

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JP2022543205A JP7237247B2 (ja) 2020-08-20 2020-08-20 共振器および高周波フィルタ
PCT/JP2020/031361 WO2022038726A1 (fr) 2020-08-20 2020-08-20 Résonateur et filtre à haute fréquence

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010018798A1 (fr) * 2008-08-11 2010-02-18 日立金属株式会社 Filtre passe-bande, section de haute fréquence, et dispositif de communication
WO2011114851A1 (fr) * 2010-03-18 2011-09-22 株式会社村田製作所 Composant stratifié à haute fréquence et filtre à haute fréquence de type stratifié
JP2012060440A (ja) * 2010-09-09 2012-03-22 Tdk Corp 積層型バンドパスフィルタ
JP2019079865A (ja) * 2017-10-20 2019-05-23 太陽誘電株式会社 電子部品

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001338838A (ja) 2000-05-26 2001-12-07 Sharp Corp 複合機能電子部品、その製造方法、及びこの複合機能電子部品を備えた電圧制御発振器
JP4457363B2 (ja) 2007-05-25 2010-04-28 Ｔｄｋ株式会社 バンドパスフィルタ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010018798A1 (fr) * 2008-08-11 2010-02-18 日立金属株式会社 Filtre passe-bande, section de haute fréquence, et dispositif de communication
WO2011114851A1 (fr) * 2010-03-18 2011-09-22 株式会社村田製作所 Composant stratifié à haute fréquence et filtre à haute fréquence de type stratifié
JP2012060440A (ja) * 2010-09-09 2012-03-22 Tdk Corp 積層型バンドパスフィルタ
JP2019079865A (ja) * 2017-10-20 2019-05-23 太陽誘電株式会社 電子部品

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