JP5288885B2 - BANDPASS FILTER, RADIO COMMUNICATION MODULE AND RADIO COMMUNICATION DEVICE USING THE SAME - Google Patents

Description

  The present invention relates to a band-pass filter, a wireless communication module and a wireless communication device using the same, and in particular, a band-pass filter having two very wide pass bands that can be suitably used for UWB (Ultra Wide Band), and The present invention relates to a wireless communication module and a wireless communication device using the same.

  In recent years, UWB has attracted attention as a new communication means. UWB realizes large-capacity data transfer using a wide frequency band in a short distance of about 10 m.

  In recent years, research on ultra-wideband filters that can be used for UWB has been actively conducted. For example, a bandpass filter that applies the principle of a directional coupler has a passband width of a specific bandwidth (bandwidth / center). There is a report that a broadband characteristic exceeding 100% is obtained in (frequency) (for example, see Non-Patent Document 1).

On the other hand, as a filter often used conventionally, there is known a band-pass filter configured by connecting a plurality of quarter-wavelength stripline resonators to each other (see, for example, Patent Document 1).
“Ultra-wideband bandpass filter using microstrip-CPW broadside coupling structure” Proceedings of the March 2005 IEICE General Conference C-2-114 p.147 JP 2004-180032 A

  However, the band-pass filters proposed in Non-Patent Document 1 and Patent Document 1 each have problems, and are not particularly suitable for UWB band-pass filters.

  For example, the bandpass filter proposed in Non-Patent Document 1 has a problem that the passband width is too wide. In other words, UWB basically uses a frequency band of 3.1 GHz to 10.6 GHz, but the International Telecommunication Union wireless communication section is about 3.1 to 4.7 GHz avoiding 5.3 GHz used in IEEE802.11.a. A plan that divides into a low band using a band and a high band using a band of about 6 GHz to 10.6 GHz has been developed. Therefore, the filters used for the UWB Low Band and High Band each require a pass bandwidth of about 40% to 50% in the specific band and attenuation at 5.3 GHz. The band-pass filter proposed in Non-Patent Document 1 having characteristics exceeding 100% cannot be used because its pass band width is too wide.

  Further, the pass band width of a bandpass filter using a conventional quarter wavelength resonator is too narrow, and even if the pass band width of the band pass filter described in Patent Document 1 is intended to be wide, it is 10 It was less than%. Therefore, it cannot be used as a band-pass filter for UWB requiring a wide pass bandwidth corresponding to 40% to 50% in the specific band.

  Therefore, the inventor of the present application proposed a bandpass filter having two very wide passbands that can cover the UWB low band filter and high band filter with a single filter in Japanese Patent Application 2007-222976. However, if the thickness is further reduced, the electromagnetic coupling between the resonator that forms the passband for the low band and the resonator that forms the passband for the high band becomes too strong, and good filter characteristics are obtained. Had the problem of becoming difficult.

  The present invention has been devised in view of such problems in the prior art, and its purpose is to have two very wide passbands and to obtain good filter characteristics even if the thickness is reduced. An object of the present invention is to provide a bandpass filter that can be used, a wireless communication module and a wireless communication device using the same.

The bandpass filter of the present invention includes a laminated body in which a plurality of dielectric layers are laminated, a first ground electrode disposed on a lower surface of the laminated body, a second ground electrode disposed on an upper surface, A plurality of strip-shaped single resonance electrodes which are arranged side by side so as to be electromagnetically coupled to each other between the first layers of the multilayer body and each function as a resonator which is grounded at one end and resonates at a first frequency; The one end of the base becomes one end by a base having one end grounded and a plurality of strip-shaped protrusions arranged side by side with one end connected to the other end of the base, and the other of the protrusions As a resonator that is configured so that one end is the other end and the one end is grounded, the whole of the base and the protrusion is resonated at a second frequency higher than the first frequency. Before functioning The protrusions function as a resonator that resonates at a third frequency higher than the second frequency, and are arranged side by side so as to be electromagnetically coupled to each other in a second layer different from the first layer of the laminate. Among the plurality of single resonance electrodes arranged between the plurality of composite resonance electrodes arranged and the third layer located between the first layer and the second layer of the laminate. A first input coupling electrode in the form of a band having an electric signal input point to which an electric signal is input and being electromagnetically coupled so as to face a region extending over half of the length direction of the single resonance electrode of the stage; An electromagnetic signal coupled to an area of the plurality of single resonance electrodes disposed between the third layers of the body so as to face a region extending over half of the length direction of the single resonance electrode of the output stage; A first output connection in the form of a band having an electrical signal output point And the electrode, arranged between the layers located between the first interlayer and the second layers of the laminate, the plurality of protrusions in a composite resonance electrode of the input stage of the plurality of complex resonance electrodes A second input coupling electrode that is electromagnetically coupled opposite the projection of the input stage, which is the projection located at a position farthest from the adjacent composite resonance electrode, and the first of the stacked body Of the plurality of protrusions in the composite resonance electrode of the output stage among the plurality of composite resonance electrodes, disposed next to the interlayer located between the first layer and the second layer , the adjacent composite resonance A plurality of single resonance electrodes and a plurality of composite resonances, and a second output coupling electrode that is electromagnetically coupled to the projection of the output stage, which is the projection located at a position farthest from the electrode. The plurality of protrusions in the electrode is a product of the stacked body The second input coupling electrodes are arranged so as to be orthogonal to each other when viewed from the layer direction. Is connected to a side far from the electric signal input point and an electric signal is input via the first input coupling electrode, and the second output coupling electrode is the output stage of the first output coupling electrode. An electrical signal is output via the first output coupling electrode by being connected to a side farther from the electrical signal output point than the center in the length direction at the portion facing the single resonance electrode. Is.

Further, the bandpass filter of the present invention having the above structure, the second input coupling electrode, when viewed from the laminate direction of the laminate, so as to intersect the front Symbol one end side of the single resonance electrode of the input stage It is disposed, and said second output coupling electrodes are arranged to intersect with the previous SL one end side of the single resonance electrode of the output stage when viewed from the laminate direction of the laminate Is.

  Furthermore, the band-pass filter according to the present invention is configured such that, in each of the above configurations, the second input coupling electrode is disposed between the third layers and integrated with the first input coupling electrode, A coupling electrode is disposed between the third layers and integrated with the first output coupling electrode.

  Furthermore, the band-pass filter according to the present invention is configured such that, in each of the above-described configurations, the second input coupling electrode is disposed between layers closer to the second layer than the third layer, and the input-side connection conductor is interposed therebetween. The second input coupling electrode is connected to the first input coupling electrode, and the second output coupling electrode is disposed between layers closer to the second layer than the third layer, and is connected to the first input via an output-side connection conductor. It is connected to the output coupling electrode.

  A wireless communication module according to the present invention includes the band-pass filter according to the present invention having any one of the above-described configurations.

  A wireless communication device of the present invention includes an RF unit including the bandpass filter of the present invention having any one of the above-described configurations, a baseband unit connected to the RF unit, and an antenna connected to the RF unit. It is characterized by this.

  The electric signal input point of the first input coupling electrode is where an electric signal is input to the first input coupling electrode, and the electric signal output point of the first output coupling electrode is the first output coupling electrode. This is where an electrical signal is output from. Further, the side farther from the electrical signal input point than the center in the length direction in the portion of the first input coupling electrode facing the single resonance electrode in the input stage is the portion facing the single resonance electrode in the input stage. When the first input coupling electrode is divided into two regions in the length direction with the center in the length direction as a boundary, it means a region on the side not including the electric signal input point. Similarly, the side farther from the electrical signal output point than the center in the length direction of the portion of the first output coupling electrode facing the single resonance electrode of the output stage is the portion facing the single resonance electrode of the output stage. When the first output coupling electrode is divided into two regions in the length direction with the center in the length direction as a boundary, it means a region on the side not including the electric signal output point.

  According to the bandpass filter of the present invention, the plurality of single resonance electrodes and the plurality of protrusions in the plurality of composite resonance electrodes are arranged so as to be orthogonal to each other when viewed from the stacking direction of the stack. An electromagnetic field generated between a plurality of single resonance electrodes and a plurality of protrusions of the plurality of composite resonance electrodes even when the body is thin and the plurality of single resonance electrodes and the plurality of composite resonance electrodes are close to each other Since the coupling can be minimized, it is possible to prevent the deterioration of the pass characteristics in the pass band due to the electromagnetic field coupling between the plurality of single resonance electrodes and the plurality of composite resonance electrodes becoming too strong.

  Here, in order to obtain a flat and low-loss pass characteristic over a very wide pass band exceeding 10% in the specific band, the electromagnetic coupling between the resonance electrode and the input coupling electrode of the input stage and the output stage It is necessary to make the electromagnetic field coupling between the resonance electrode and the output coupling electrode very strong. However, the first input coupling electrode that is electromagnetically coupled to face the single resonance electrode of the input stage and the second electromagnetic field coupling that is opposed to the protrusion of the input stage in the composite resonance electrode of the input stage are the second. The input coupling electrode is connected, and the first output coupling electrode that is electromagnetically coupled opposite the single resonance electrode of the output stage and the electromagnetic coupling is opposed to the protrusion of the output stage of the composite resonance electrode of the output stage. By simply connecting the second output coupling electrode, electromagnetic coupling between the single resonance electrode in the input stage and the first input coupling electrode and electromagnetic coupling between the single resonance electrode in the output stage and the first output coupling electrode are possible. It has been found by the inventor's examination that the field coupling is insufficient and that no good pass characteristics can be obtained in the pass band formed by a plurality of single resonance electrodes.

  Therefore, as a result of various studies, the inventor of the present application has provided an electric signal input point where an electric signal is input to the first input coupling electrode, and the second input coupling electrode is connected to the first input coupling electrode. The electric signal is input via the first input coupling electrode, and the position where the second input coupling electrode is connected to the first input coupling electrode is set to the input stage of the first input coupling electrode. The electromagnetic coupling between the first input coupling electrode and the single resonance electrode of the input stage is sufficiently achieved by making the side farther from the electric signal input point than the center in the length direction at the portion facing the single resonance electrode. I found that it can be made strong. The reason why such an effect is obtained is that the second input coupling electrode is farther from the electrical signal input point than the center in the length direction at the portion of the first input coupling electrode facing the single resonance electrode of the input stage. By ensuring that an electric signal is input through the first input coupling electrode and the first input coupling electrode, the current flowing through the portion of the first input coupling electrode facing the single resonance electrode in the input stage is sufficiently secured. It is thought to be possible.

  Similarly, an electrical signal output point at which an electrical signal is output is provided on the first output coupling electrode, and the second output coupling electrode is connected to the first output coupling electrode and electrically connected via the first output coupling electrode. The position at which the second output coupling electrode is connected to the first output coupling electrode is set to the length of the first output coupling electrode at the portion facing the single resonance electrode at the output stage. By making the side farther from the electrical signal output point than the center of the direction, the electromagnetic coupling between the first output coupling electrode and the single resonance electrode of the output stage can be made sufficiently strong.

  That is, according to the band-pass filter of the present invention, the first input coupling electrode is electromagnetically coupled to the region extending over half the length direction of the single resonance electrode of the input stage via the dielectric layer. The first output coupling electrode is electromagnetically coupled to the region extending over half of the length direction of the single resonance electrode of the output stage via the dielectric layer, and the second input coupling electrode is the first input coupling electrode. The input coupling electrode is connected to a side farther from the electrical signal input point than the center in the length direction at the portion facing the single resonance electrode of the input stage of the input coupling electrode, and an electrical signal is input via the first input coupling electrode, The second output coupling electrode is connected to the side farther from the electrical signal output point than the center in the length direction at the portion of the first output coupling electrode facing the single resonance electrode of the output stage, and is connected to the first output coupling electrode. Since an electric signal is output via the first input coupling electrode, Since the electromagnetic field coupling with the single resonance electrode of the force stage and the electromagnetic field coupling between the first output coupling electrode and the single resonance electrode of the output stage can be made sufficiently strong, a plurality of single resonance electrodes Thus, it is possible to obtain a bandpass filter having excellent pass characteristics that is flat and has low loss over the entire wide passband formed by the above.

  Further, according to the bandpass filter of the present invention, the second input coupling electrode is arranged so as to cross one end side from the center in the length direction of the single resonance electrode of the input stage when viewed from the stacking direction of the stacked body. When the second output coupling electrode is arranged so as to cross one end side from the center in the length direction of the single resonance electrode of the output stage when viewed from the stacking direction of the stacked body, The coupling due to the electric field between the input coupling electrode and the single resonance electrode of the input stage can be reduced, and the coupling due to the electric field between the second output coupling electrode and the single resonance electrode of the output stage can be reduced. A filter caused by an increase in unnecessary electromagnetic coupling between the second input coupling electrode and the single resonance electrode of the input stage and between the second output coupling electrode and the single resonance electrode of the output stage. The deterioration of the characteristics can be prevented.

  Further, according to the bandpass filter of the present invention, the second input coupling electrode is disposed between the third layers and integrated with the first input coupling electrode, and the second output coupling electrode is the third interlayer. When the first output coupling electrode is integrated with the first output coupling electrode, the connection conductor connecting the first input coupling electrode and the second input coupling electrode, and the first output coupling electrode and the second output coupling electrode are connected. Therefore, a thin band-pass filter having a simple structure can be obtained while loss due to the connection conductor can be eliminated.

  Still further, according to the bandpass filter of the present invention, the second input coupling electrode is disposed between the layers closer to the second layer than the third layer, and the first input coupling electrode is interposed via the input side connection conductor. , While maintaining the distance between the first input coupling electrode and the single resonance electrode of the input stage and the distance between the second input coupling electrode and the composite resonance electrode of the input stage, Since the distance between the single resonance electrode and the composite resonance electrode of the input stage can be widened, the electromagnetic coupling between the first input coupling electrode and the single resonance electrode of the input stage, and the second input coupling electrode, The electromagnetic coupling between the single resonant electrode of the input stage and the composite resonant electrode of the input stage can be weakened without weakening the electromagnetic coupling with the composite resonant electrode of the input stage, and thereby the first input coupled electrode. And electromagnetic coupling between the input stage and the single resonant electrode of the input stage. An input coupling electrode electromagnetic coupling between the complex resonance electrode of the input stage can be further strengthened for. Similarly, when the second output coupling electrode is disposed between layers closer to the second layer than the third layer and connected to the first output coupling electrode via the output-side connection conductor, While maintaining the distance between the output coupling electrode and the output stage single resonance electrode and the distance between the second output coupling electrode and the output stage composite resonance electrode, the output stage single resonance electrode and the output stage composite resonance are maintained. Since it is possible to widen the gap between the electrodes, the electromagnetic coupling between the first output coupling electrode and the single resonance electrode at the output stage and the electromagnetic field between the second output coupling electrode and the composite resonance electrode at the output stage Without weakening the coupling, it is possible to weaken the electromagnetic coupling between the single resonant electrode of the output stage and the composite resonant electrode of the output stage, and thereby, the first resonant coupling electrode and the single resonant electrode of the output stage can be reduced. An electromagnetic coupling and second output coupling electrode and an output stage composite resonant electrode; It is possible to further strengthen the electromagnetic coupling.

  According to the wireless communication module of the present invention and the wireless communication device of the present invention, by using the band-pass filter of the present invention with a small loss of the signal passing over the entire communication band for filtering the transmission signal and the reception signal, Since the attenuation of the reception signal and the transmission signal passing through the band pass filter is reduced, the reception sensitivity is improved, and the amplification degree of the transmission signal and the reception signal can be reduced, so that the power consumption in the amplifier circuit is reduced. Therefore, a high-performance wireless communication module and wireless communication device with high reception sensitivity and low power consumption can be obtained. Furthermore, by using the band-pass filter of the present invention that can cover two communication bands with one filter and obtain good filter characteristics even if it is thin, a wireless communication module that is small in size and low in manufacturing cost A wireless communication device can be obtained.

  Hereinafter, a bandpass filter of the present invention, a wireless communication module and a wireless communication device using the same will be described in detail with reference to the accompanying drawings.

(First example of embodiment)
FIG. 1 is an external perspective view schematically showing an example of an embodiment of a bandpass filter of the present invention. FIG. 2 is a schematic exploded perspective view of the example of the bandpass filter shown in FIG. FIG. 3 is a plan view schematically showing upper and lower surfaces and layers of the example of the bandpass filter shown in FIG. FIG. 4 is a cross-sectional view taken along the line PP ′ of the example of the bandpass filter shown in FIG.

  As shown in FIGS. 1 to 4, the bandpass filter of this example includes a laminated body 10 in which a plurality of dielectric layers 11 are laminated, a first ground electrode 21 disposed on the lower surface of the laminated body 10, and The second ground electrode 22 disposed on the upper surface and the first layer of the laminate 10 are disposed side by side so as to be electromagnetically coupled to each other, and one end thereof is grounded and resonates at the first frequency. Band-shaped single resonance electrodes 30a, 30b, 30c, and 30d that function as resonators, a base portion 27 whose one end is grounded, and a band-like shape that is arranged side by side with one end connected to the other end of the base portion 27 The protrusions 28a and 28b are configured such that one end of the base 27 becomes one end and the other end of the protrusions 28a and 28b becomes the other end, and the one end is grounded, whereby the base 27 and the protrusions 28a and 28b are grounded. Resonates at a second frequency higher than the first frequency. The protrusions 28a and 28b function as a resonator and function as a resonator that resonates at a third frequency higher than the second frequency so as to be electromagnetically coupled to each other between the second layers of the stacked body 10. Composite resonance electrodes 29a and 29b arranged side by side.

  Further, the bandpass filter of this example is the length direction of the single resonance electrode 30a in the input stage, which is disposed between the first layer and the second layer of the multilayer body 10 and disposed between the third layer. The length of the band-shaped first input coupling electrode 40a having the electric signal input point 45a to which an electric signal is input and the single resonance electrode 30b of the output stage The first output coupling electrode 40b in the form of a band having an electric signal output point 45b to which an electric signal is output and an electromagnetic field coupling opposed to a region extending over half of the vertical direction, and an input stage composite resonance electrode 29a A second input coupling electrode 41a that electromagnetically couples facing the protrusion 28a of the input stage, and a second output coupling that electromagnetically couples opposite the protrusion 28b of the output stage of the composite resonance electrode 29b of the output stage. And an electrode 41b. The first input coupling electrode 40a and the second input coupling electrode 41a are integrated, and the first output coupling electrode 40b and the second output coupling electrode 41b are integrated.

  Further, the bandpass filter of this example is formed in an annular shape so as to surround the single resonance electrodes 30a, 30b, 30c, and 30d between the first layers of the multilayer body 10, and the single resonance electrodes 30a, 30b, and 30c are formed. , 30d is connected to the first annular ground electrode 23 connected to the ground potential, and is formed in an annular shape so as to surround the periphery of the composite resonance electrodes 29a and 29b between the second layers. And a second annular ground electrode 24 connected to the ground potential, to which one end of 29a and 29b is connected.

  Furthermore, in the band-pass filter of this example, the first input coupling electrode 40a is connected to the input terminal electrode 60a disposed on the upper surface of the multilayer body 10 through the through conductor 50 penetrating the dielectric layer 11. The first output coupling electrode 40b is connected to an output terminal electrode 60b disposed on the upper surface of the multilayer body 10 through a through conductor 50 penetrating the dielectric layer 11. Therefore, the connection point between the first input coupling electrode 40a and the through conductor 50 is an electric signal input point 45a in the first input coupling electrode 40a, and the connection between the first output coupling electrode 40b and the through conductor 50 is achieved. The point is an electric signal output point 45b in the first output coupling electrode 40b.

  The band-pass filter of this example having such a configuration has a first input coupling when an electric signal from an external circuit is input to the first input coupling electrode 40a via the input terminal electrode 60a and the through conductor 50. By exciting the input stage single resonance electrode 30a that is electromagnetically coupled to the electrode 40a, the single resonance electrodes 30a, 30b, 30c, and 30d that are electromagnetically coupled to each other resonate and the single resonance electrode of the output stage is resonated. An electrical signal is output from the first output coupling electrode 40b electromagnetically coupled to 30b to the external circuit via the through conductor 50 and the output terminal electrode 60b. At this time, since a signal in the first frequency band including the first frequency at which the single resonance electrodes 30a, 30b, 30c, and 30d resonate selectively passes, a first pass band is thereby formed. At the same time, since the electric signal from the external circuit is also input to the second input coupling electrode 41a via the input terminal electrode 60a, the through conductor 50 and the first input coupling electrode 40a, the second input coupling electrode When the composite resonance electrode 29a of the input stage that is electromagnetically coupled to 41a is excited, the composite resonance electrodes 29a and 29b that are electromagnetically coupled to each other resonate, and the second is to be electromagnetically coupled to the composite resonance electrode 29b of the output stage. An electrical signal is output from the output coupling electrode 41b to the external circuit via the first output coupling electrode 40b, the through conductor 50, and the output terminal electrode 60b. At this time, a signal in the second frequency band including the second frequency and the third frequency at which the composite resonance electrodes 29a and 29b resonate selectively passes, thereby forming a second pass band. In this way, the bandpass filter of this example functions as a bandpass filter having two passbands having different frequencies.

  In the band-pass filter of this example, the band-shaped single resonance electrodes 30a, 30b, 30c, and 30d have an electrical length set to about ¼ of the wavelength at the first frequency, and one end of each of the band-pass filters has the first end. It functions as a quarter wavelength resonator by being connected to the annular ground electrode 23 and grounded. The composite resonance electrodes 29a and 29b have a base portion 27 whose one end is grounded and a plurality of strip-like protrusion portions 28a, one end of which is connected to the other end of the base portion 27 and arranged at intervals. By 28b, one end of the base portion 27 becomes one end, and the other ends of the projecting portions 28a and 28b become the other end. Then, one end (that is, one end of the base 27) is grounded, so that basically the entire base 27 and the projections 28a and 28b are resonated at the second frequency. And the protrusions 28a and 28b function as quarter-wave resonators that resonate at a third frequency higher than the second frequency. Therefore, the total length of the composite resonance electrode including the base 27 and the protrusions 28a and 28b is substantially equal to ¼ of the wavelength at the second frequency, and the length of the protrusions 28a and 28b is the third frequency. Is approximately equal to ¼ of the wavelength at. The lengths of the protrusions 28a and 28b are basically set to be equal, but there are cases where it is better to make the lengths slightly different depending on the coupling state with other electrodes. The number of protrusions may be three or more, but it is better to use two for miniaturization.

  In the bandpass filter of this example, the single resonance electrodes 30a, 30b, 30c, and 30d are arranged side by side between the first layers of the multilayer body 10 so that the respective one ends thereof are staggered, thereby being an interdigital type. The composite resonance electrodes 29a and 29b are arranged side by side between the second layers of the multilayer body 10 so that the respective one ends thereof are staggered and are electromagnetically coupled to the interdigital type. By the interdigital type strong coupling that combines the coupling by the magnetic field and the coupling by the electric field, the resonance frequency interval of each resonance mode that forms the pass band can be increased to a very wide pass bandwidth exceeding 10% in the specific band. It becomes easy to make it reasonable to obtain. When the distance between the resonant electrodes arranged side by side is smaller, stronger coupling can be obtained. However, if the distance is reduced, manufacturing becomes difficult. For example, the distance is set to about 0.05 to 0.5 mm.

  Further, in the bandpass filter of this example, the first input coupling electrode 40a and the first output coupling electrode 40b have the same dimensions as the input stage single resonance electrode 30a and the output stage single resonance electrode 30b. Preferably it is set. Further, the distance between the first input coupling electrode 40a and the first output coupling electrode 40b and the single resonance electrode 30a of the input stage and the single resonance electrode 30b of the output stage, and the second input coupling electrode 41a and the second The distance between the output coupling electrode 41b, the input stage composite resonance electrode 29a, and the output stage composite resonance electrode 29b is set to, for example, about 0.01 to 0.5 mm because the coupling becomes stronger but the manufacturing becomes difficult if the distance is reduced. Is done.

  Further, in the bandpass filter of this example, the second input coupling electrode 41a is band-shaped and is disposed so as to oppose the input stage protrusion 28a of the input stage composite resonance electrode 29a. The first input coupling electrode 40a is integrated with the first input coupling electrode 40a. Therefore, a portion where the first input coupling electrode 40a and the second input coupling electrode 41a intersect functions as the first input coupling electrode 40a and also functions as the second input coupling electrode 41a. The second output coupling electrode 41b has a belt-like shape and is disposed so as to oppose the output stage protrusion 28b of the output stage composite resonance electrode 29b so as to intersect with the first output coupling electrode 40b. Are integrated with the first output coupling electrode 40b. Therefore, the portion where the first output coupling electrode 40b and the second output coupling electrode 41b intersect functions as the first output coupling electrode 40b and also functions as the second output coupling electrode 41b. The lengths of the second input coupling electrode 41a and the second output coupling electrode 41b are appropriately set according to the required coupling amount.

  According to the bandpass filter of this example, the single resonance electrodes 30a, 30b, 30c, 30d and the protrusions 28a, 28b of the composite resonance electrodes 29a, 29b are orthogonal to each other when viewed from the stacking direction of the stacked body 10. Therefore, even when the laminated body 10 is thin and the single resonance electrodes 30a, 30b, 30c, and 30d are close to the composite resonance electrodes 29a and 29b, the single resonance electrodes 30a, 30b, and 30c are disposed. , 30d and the projecting portions 28a, 28b of the composite resonant electrodes 29a, 29b can be minimized, so that the single resonant electrodes 30a, 30b, 30c, 30d and the composite resonant electrodes 29a, 29d, It is possible to prevent the deterioration of the pass characteristics in the pass band due to the electromagnetic field coupling with 29b becoming too strong.

  Further, according to the bandpass filter of this example, the first input coupling electrode 40a is opposed to the entire region in the length direction of the single resonance electrode 30a of the input stage via the dielectric layer 11, and the electromagnetic field. The first output coupling electrode 40b is electromagnetically coupled to the entire region in the length direction of the single resonance electrode 30b of the output stage via the dielectric layer 11, and is coupled to the second input coupling. The electrode 41a is connected to the side farther from the electrical signal input point 45a than the center in the length direction at the portion of the first input coupling electrode 40a facing the single resonance electrode 30a in the input stage, and is connected to the first input coupling electrode 40a. The second output coupling electrode 41b has an electrical signal output point 45b that is more than the center in the length direction at the portion of the first output coupling electrode 40b facing the single resonance electrode 30b of the output stage. Is connected to the side far from the first electrode, and an electric signal is output via the first output coupling electrode 40b. Therefore, the electromagnetic coupling between the first input coupling electrode 40a and the input stage single resonance electrode 30a and the electromagnetic coupling between the first output coupling electrode 40b and the output stage single resonance electrode 30b are sufficiently performed. Since it can be made strong, it is possible to obtain a bandpass filter having excellent pass characteristics that is flat and low loss over the entire wide passband formed by the single resonant electrodes 30a, 30b, 30c, 30d. it can.

  Further, according to the bandpass filter of this example, the electric signal input point 45a is located at the end in the length direction at the portion of the first input coupling electrode 40a facing the single resonance electrode 30a in the input stage. Since the electric signal output point 45b is located at the end of the first output coupling electrode 40b facing the single resonance electrode 30b in the output stage in the length direction, the first input coupling electrode 40a The electromagnetic coupling between the input stage single resonance electrode 30a and the first output coupling electrode 40b and the output stage single resonance electrode 30b can be further enhanced.

  Furthermore, according to the band-pass filter of this example, the electric signal input point 45a is closer to the input stage than the center in the length direction at the portion of the first input coupling electrode 40a facing the single resonance electrode 30a of the input stage. The single resonance electrode 30a is located farther from one end (grounding end) of the single resonance electrode 30a, and the electric signal output point 45b is the length of the first output coupling electrode 40b at the portion of the output stage facing the single resonance electrode 30b. The first input coupling electrode 40a and the input stage single resonance electrode 30a are interleaved because they are located on the side farther from one end (ground end) of the output stage single resonance electrode 30b than the center of the direction. Since the first output coupling electrode 40b and the single resonance electrode 30b of the output stage are electromagnetically coupled to the digital type, the first output coupling electrode 40b and the single resonance electrode 30b of the output stage are electromagnetically coupled to each other. Electromagnetic coupling with electrode 30a and output with first output coupling electrode 40b Electromagnetic coupling between the single resonance electrode 30b can be even more strong.

  Furthermore, according to the band-pass filter of this example, the second input coupling electrode 41a is disposed so as to face one end (ground end) side from the center in the length direction of the single resonance electrode 30a of the input stage. The second output coupling electrode 41b is disposed so as to face one end (grounding end) side of the center in the length direction of the single resonance electrode 30b of the output stage. It is possible to reduce the coupling due to the electric field between the coupling electrode 41a and the single resonance electrode 30a at the input stage, and to reduce the coupling due to the electric field between the second output coupling electrode 41b and the single resonance electrode 30b at the output stage. Therefore, unnecessary electromagnetic field coupling between the second input coupling electrode 41a and the input stage single resonance electrode 30a and between the second output coupling electrode 41b and the output stage single resonance electrode 30b is large. Can prevent deterioration of filter characteristics due to .

  Still further, according to the bandpass filter of this example, the second input coupling electrode 41a is disposed between the third layers and integrated with the first input coupling electrode 40a, and the second output coupling electrode 41b is Since it is disposed between the third layers and integrated with the first output coupling electrode 40b, the connection conductor and the first output coupling electrode for connecting the first input coupling electrode 40a and the second input coupling electrode 41a Since a connection conductor for connecting 40b and the second output coupling electrode 41b is not necessary, loss due to the connection conductor can be eliminated, and a thin bandpass filter having a simple structure can be obtained.

  Furthermore, according to the bandpass filter of the present example, the one end of the single resonance electrode 30a in the input stage and the one end of the single resonance electrode 30b in the output stage are alternately arranged, and the input Since one end of the input stage protrusion 28a of the multi-stage composite resonance electrode 29a and one end of the output stage protrusion 28b of the output multi-stage resonance electrode 29b are alternately arranged, the first The electromagnetic coupling between the input coupling electrode 40a and the single resonance electrode 30a at the input stage and the electromagnetic coupling between the first output coupling electrode 40b and the single resonance electrode 30b at the output stage are sufficiently strong and symmetrical. A band-pass filter having the structure and circuit configuration can be obtained.

  Still further, according to the bandpass filter of this example, since the second passband is formed using the composite resonance electrodes 29a and 29b, the length of the composite resonance electrodes 29a and 29b and the protrusions 28a and 28b are formed. Since the second frequency and the third frequency are determined according to the length of the band, a bandpass filter capable of easily setting the bandwidth of the second passband with a high degree of freedom can be obtained. .

(Second example of embodiment)
FIG. 5 is an external perspective view schematically showing another example of the embodiment of the band-pass filter of the present invention. 6 is a schematic exploded perspective view of the example of the bandpass filter shown in FIG. FIG. 7 is a plan view schematically showing upper and lower surfaces and layers of the example of the bandpass filter shown in FIG. FIG. 8 is a cross-sectional view taken along the line QQ ′ of the example of the bandpass filter shown in FIG. Note that in this example, only differences from the first example described above will be described, and the same components will be denoted by the same reference numerals, and redundant description will be omitted.

  In the band-pass filter of this example, as shown in FIGS. 5 to 8, a region facing the first annular ground electrode 23 in the layer A located between the lower surface of the multilayer body 10 and the first layer. And a region facing the single resonance electrodes 330c and 30d, and the region facing the single resonance electrodes 30c and 30d is formed by the through conductor 50 penetrating the dielectric layer 11 to provide the single resonance electrodes 30c and 30d. Resonant auxiliary electrodes 32c and 32d respectively connected to the other end of each of them are arranged corresponding to the single resonant electrodes 30c and 30d. Further, between the third layers of the laminated body 10, it is arranged so as to have a region facing the first annular ground electrode 23 and a region facing the single resonance electrodes 30a, 30b, and the single resonance electrodes 30a, 30b. Resonance auxiliary electrodes 32a and 32b connected to the other ends of the single resonance electrodes 30a and 30b by through conductors 50 having regions opposite to each other penetrating the dielectric layer 11 are connected to the single resonance electrodes 30a and 30b, respectively. Correspondingly arranged.

  Furthermore, in the band pass filter of this example, the second layer of the multilayer body 10 is disposed so as to have a region facing the resonance auxiliary electrode 32a and a region facing the first input coupling electrode 40a. The region where the region facing the first input coupling electrode 40a is connected to the first input coupling electrode 40a by the through conductor 50, and the region facing the resonance auxiliary electrode 32a is connected to the input terminal electrode 60a by the through conductor 50 A coupling auxiliary electrode 46a is provided. Similarly, the interlayer C is disposed so as to have a region facing the resonance auxiliary electrode 32b and a region facing the first output coupling electrode 40b, and the region facing the first output coupling electrode 40b penetrates therethrough. An output coupling auxiliary electrode 46b is connected to the first output coupling electrode 40b by the conductor 50, and a region facing the resonance auxiliary electrode 32b is connected to the output terminal electrode 60b through the through conductor 50.

  According to the bandpass filter of this example having such a structure, the capacitance generated between the resonance auxiliary electrodes 32a, 32b, 32c, 32d and the first annular ground electrode 23 is reduced to the single resonance electrode 30a, Since it is added to the capacitance generated between 30b, 30c, 30d and the ground potential, the length of the single resonance electrodes 30a, 30b, 30c, 30d can be shortened, so that a smaller band pass filter can be obtained. Can be obtained.

  Further, according to the bandpass filter of this example, the electromagnetic coupling between the input coupling auxiliary electrode 46a and the resonance auxiliary electrode 32a is changed to the electromagnetic coupling between the first input coupling electrode 40a and the single resonance electrode 30a in the input stage. In addition, the electromagnetic coupling between the output coupling auxiliary electrode 46b and the resonance auxiliary electrode 32b is added to the electromagnetic coupling between the first output coupling electrode 40b and the single resonance electrode 30b of the output stage. Since the electromagnetic coupling between one input coupling electrode 40a and the single resonance electrode 30a at the input stage and the electromagnetic coupling between the first output coupling electrode 40b and the single resonance electrode 30b at the output stage are further strengthened, single resonance is achieved. In the passband formed by the electrodes 30a, 30b, 30c, and 30d, even if the passband is very wide, the increase in insertion loss at a frequency located between the resonance frequencies of the respective resonance modes is further reduced. Across the wide passband Low-loss pass characteristic than flatter Te can be obtained.

The area of the facing portion between the resonance auxiliary electrodes 32a, 32b, 32c, 32d and the first annular ground electrode 23 is set to, for example, about 0.01 to ³ mm ² according to the required capacitance. Further, the smaller the distance between the resonance auxiliary electrodes 32a, 32b, 32c, 32d and the first annular ground electrode 23, the larger the capacitance can be generated, but the manufacturing becomes difficult. It is set to about 0.5 mm.

  Further, the widths of the input coupling auxiliary electrode 46a and the output coupling auxiliary electrode 46b are set, for example, to be approximately the same as those of the first input coupling electrode 40a and the first output coupling electrode 40b, and the input coupling auxiliary electrode 46a and the output coupling auxiliary electrode 46b. The length of the electrode 46b is set slightly longer than the length of the resonance auxiliary electrodes 32a and 32b, for example. The smaller distances between the input coupling auxiliary electrode 46a and the output coupling auxiliary electrode 46b and the resonance auxiliary electrodes 32a and 32b are desirable in terms of causing strong coupling, but are difficult to manufacture. For example, 0.01 to 0.5 mm Set to degree.

(Third example of embodiment)
FIG. 9 is an external perspective view schematically showing still another example of the embodiment of the band-pass filter of the present invention. FIG. 10 is a schematic exploded perspective view of the example of the bandpass filter shown in FIG. FIG. 11 is a plan view schematically showing the upper and lower surfaces and the layers of the example of the bandpass filter shown in FIG. 12 is a cross-sectional view taken along the line RR ′ of the example of the bandpass filter shown in FIG. Note that in this example, only differences from the first example described above will be described, and the same components will be denoted by the same reference numerals, and redundant description will be omitted.

  In the bandpass filter of this example, as shown in FIGS. 9 to 12, the input coupling auxiliary electrode 46a and the output coupling auxiliary electrode 46b are located between the second layer and the third layer of the multilayer body 10. Arranged between the layers B. In addition, the second input coupling electrode 41a and the second output coupling electrode 41b are disposed in the interlayer C located between the second interlayer and the interlayer B of the multilayer body 10, and the second input coupling electrode 41a is connected to the first input coupling electrode 40a via the input side connection conductor 43a, and the second output coupling electrode 41b is connected to the first output coupling electrode 40b via the output side connection conductor 43b. Yes.

  According to the band-pass filter of this example having such a structure, the second input coupling electrode 41a is disposed in the layer C closer to the second layer than the third layer. The input stage single resonance electrode 30a and the input stage are maintained while maintaining the distance between the electrode 40a and the input stage single resonance electrode 30a and the distance between the second input coupling electrode 41a and the input stage composite resonance electrode 29a. The distance between the first resonance electrode 29a and the first resonance electrode 29a can be increased, so that the first input coupling electrode 40a and the input stage single resonance electrode 30a can be electromagnetically coupled and the second input coupling electrode 41a and the input stage. Without weakening the electromagnetic coupling with the composite resonant electrode 29a, it is possible to weaken the electromagnetic coupling between the single resonant electrode 30a at the input stage and the composite resonant electrode 29a at the input stage, whereby the first input coupled electrode 40a and the input stage single resonant electrode 30a It can further strengthen the electromagnetic coupling between the complex resonance electrode 29a of the input stage and the second input coupling electrode 41a.

  Further, according to the bandpass filter of this example, the second output coupling electrode 41b is disposed in the interlayer C closer to the second layer than the third layer, so that the first output coupling electrode 40b and the output The output stage single resonance electrode 30b and the output stage composite resonance electrode while maintaining the distance between the single stage resonance electrode 30b and the gap between the second output coupling electrode 41b and the output stage composite resonance electrode 29b. Since it is possible to widen the distance between the first output coupling electrode 40b and the output stage single resonance electrode 30b, the second output coupling electrode 41b and the output stage composite resonance electrode 29b can be widened. Without weakening the electromagnetic coupling between the first output coupling electrode 40b and the output stage, thereby reducing the electromagnetic coupling between the output stage single resonance electrode 30b and the output stage composite resonance electrode 29b. Electromagnetic field coupling and second output coupling with a single resonant electrode 30b It can further strengthen the electromagnetic coupling between the complex resonance electrode 29b of the electrode 41b and the output stage.

(Fourth example of embodiment)
FIG. 13 is a block diagram showing a configuration example of the wireless communication module 80 and the wireless communication device 85 using the bandpass filter of the present invention.

  The wireless communication module 80 of the present invention includes, for example, 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 and before demodulation of the baseband signals. And. The RF unit 82 includes the bandpass filter 821 of the present invention described above, and an RF signal obtained by modulating the baseband signal or a signal other than the communication band in the received RF signal is attenuated by the bandpass filter 821. Yes. Specifically, a baseband IC 811 is disposed in the baseband unit 81, and an RF IC 822 is disposed between the bandpass filter 821 and the baseband unit 81 in the RF unit 82. Note that another circuit may be interposed between these circuits. Then, by connecting the antenna 84 to the bandpass filter 821 of the wireless communication module 80, the wireless communication device 85 of the present invention that transmits and receives RF signals is configured.

  According to the wireless communication module 80 and the wireless communication device 85 of the present example having such a configuration, the transmission signal is transmitted through the bandpass filter 821 of the present invention with a small loss of a signal passing over the entire frequency band used for communication. And used for filtering the received signal, the attenuation of the received signal and the transmitted signal passing through the bandpass filter 821 is reduced, so that the reception sensitivity is improved and the amplification degree of the transmitted signal and the received signal can be reduced. Power consumption in the circuit is reduced. Therefore, a high-performance wireless communication module 80 and a wireless communication device 85 with high reception sensitivity and low power consumption can be obtained. Further, by using the band-pass filter of the present invention that can cover two communication bands with one filter and obtain good filter characteristics even if it is thinned, the wireless communication module 80 is small in size and low in manufacturing cost. In addition, the wireless communication device 85 can be obtained.

In the band-pass filter of the present invention, as the material of the dielectric layer 11, for example, a resin such as an epoxy resin or a ceramic such as a dielectric ceramic can be used. For example, a dielectric ceramic material such as BaTiO ₃ , Pb ₄ Fe ₂ Nb ₂ O ₁₂ , or TiO ₂ and a glass material such as B ₂ O ₃ , SiO ₂ , Al ₂ O ₃ , or ZnO, and 800 to 1200 ° C. Glass-ceramic materials that can be fired at relatively low temperatures are preferably used. The thickness of the dielectric layer 11 is set to about 0.01 to 0.1 mm, for example.

  Examples of the materials for the various electrodes and through conductors described above include conductive materials mainly composed of Ag alloys such as Ag, Ag-Pd, and Ag-Pt, Cu-based, W-based, Mo-based, and Pd-based conductive materials. Are preferably used. The thickness of various electrodes is set to 0.001 to 0.2 mm, for example.

  The bandpass filter of the present invention can be manufactured, for example, as follows. First, an appropriate organic solvent or the like is added to and mixed with the ceramic raw material powder to produce a slurry, and a ceramic green sheet is formed by a doctor blade method. Next, a through hole for forming a through conductor is formed on the obtained ceramic green sheet using a punching machine or the like, and a conductive paste containing a conductor such as Ag, Ag-Pd, Au, Cu is filled and the ceramic The same conductive paste as described above is applied to the surface of the green sheet using a printing method to produce a ceramic green sheet with a conductive paste. Next, these ceramic green sheets with a conductive paste are laminated, pressed using a hot press device, and fired at a peak temperature of about 800 ° C. to 1050 ° C.

(Modification)
The present invention is not limited to the first to fourth examples of the embodiment described above, and various modifications and improvements can be made without departing from the gist of the present invention.

  For example, in the first to third examples of the above-described embodiment, an example in which the input terminal electrode 60a and the output terminal electrode 60b are provided is shown. However, a band-pass filter is formed in one region in the module substrate. In such a case, the input terminal electrode 60a and the output terminal electrode 60b are not necessarily required, and the wiring conductor from the external circuit in the module substrate is directly connected to the first input coupling electrode 40a and the first output coupling electrode 40b. You may make it. In this case, the connection points between the first input coupling electrode 40a and the first output coupling electrode 40b and the wiring conductor are the electric signal input point 45a of the first input coupling electrode 40a and the first output coupling electrode 40b. It becomes an electric signal output point 45b. When the input coupling auxiliary electrode 46a and the output coupling auxiliary electrode 46b are provided, the wiring conductor from the external circuit may be directly connected to the input coupling auxiliary electrode 46a and the output coupling auxiliary electrode 46b.

  Furthermore, in the first to third examples of the above-described embodiment, the first ground electrode 21 is disposed on the lower surface of the multilayer body 10 and the second ground electrode 22 is disposed on the upper surface of the multilayer body 10. For example, a dielectric layer may be further disposed under the first ground electrode 21, or a dielectric layer may be further disposed over the second ground electrode 22.

  Furthermore, in the first to third examples of the above-described embodiment, an example in which four single resonance electrodes 30a, 30b, 30c, and 30d and two composite resonance electrodes 29a and 29b are provided is shown. Depending on the required passband width and attenuation outside the passband, the number of single resonant electrodes and composite resonant electrodes may be varied. If the required passband width is narrow or the attenuation outside the required passband is small, the number of resonant electrodes may be reduced. Conversely, the required passband width is wide. In some cases or when the required attenuation outside the passband is large, the number of resonant electrodes may be further increased. However, if the number of resonance electrodes increases too much, the size and the loss in the passband increase, so it is desirable to set the number of single resonance electrodes to about 10 or less. Is preferably set to about 5 or less.

  Furthermore, in the first to third examples of the above-described embodiment, one end (grounding end) of each of the resonance electrodes in each of the single resonance electrodes 30a, 30b, 30c, 30d and the composite resonance electrodes 29a, 29b. ) Are arranged side by side so as to be staggered and electromagnetically coupled to an interdigital type. However, when it is not necessary to use a symmetrical circuit, a plurality of single resonance electrodes and a plurality of composite resonance electrodes At least one of them may be arranged so that one end of the adjacent resonance electrode is located on the same side and electromagnetically coupled to the comb line type. Further, in at least one of the plurality of single resonance electrodes and the plurality of composite resonance electrodes, the comb line type electromagnetic field coupling arranged so that one end of the adjacent resonance electrode is located on the same side, You may make it arrange | position side by side so that the interdigital type electromagnetic field coupling arrange | positioned so that one end may become alternate may be mixed. Further, in the plurality of composite resonance electrodes, a single resonance electrode may be disposed between adjacent composite resonance electrodes, and the adjacent composite resonance electrodes may be electromagnetically coupled to each other via the single resonance electrode. Absent.

  Furthermore, in the first to third examples of the above-described embodiment, the example in which the stacked body 10 is configured by one stacked body has been shown, but the stacked bodies are arranged so as to overlap each other in the stacking direction. The laminated body 10 may be configured by a plurality of laminated bodies. For example, in the bandpass filter of the first example of the above-described embodiment, the stacked body 10 is configured by the first stacked body and the second stacked body disposed thereon, and the first interlayer is The first interlayer is an interlayer, the second interlayer is an interlayer in the second stack disposed on the first stack, and the third interlayer is the first stack and the first stack. You may make it be an interlayer between two laminated bodies.

  Furthermore, although the band pass filter used for UWB has been described above as an example, it goes without saying that the band pass filter of the present invention is effective in other applications that require a wide band.

  Next, a specific example of the bandpass filter of the present invention will be described.

  The electrical characteristics of the bandpass filter of the third example of the embodiment shown in FIGS. 9 to 12 were calculated by simulation using a finite element method.

  As a calculation condition, the first resonance electrodes 30a, 30b, 30c, and 30d have a rectangular shape with a width of 0.175 mm and a length of 4.05 mm. The distance between the first resonance electrode 30a and the first resonance electrode 30c and the distance between the first resonance electrode 30d and the first resonance electrode 30b are 0.075 mm, respectively. The distance from the electrode 30d was 0.09 mm. The composite resonance electrode 29a of the input stage has a rectangular input stage protrusion 28a having a width of 0.25 mm and a length of 1.47 mm at the other end of a rectangular base 27 having a width of 0.63 mm and a length of 0.68 mm. The protrusions 28b of the rectangular output stage having a width of 0.25 mm and a length of 2.72 mm are arranged with an interval of 0.13 mm. The output stage composite resonance electrode 29b has a rectangular input stage protrusion 28a having a width of 0.25 mm and a length of 2.72 mm at the other end of a rectangular base 27 having a width of 0.63 mm and a length of 0.68 mm. The protrusions 28b of the rectangular output stage having a width of 0.25 mm and a length of 1.47 mm are arranged with an interval of 0.13 mm. The distance between the input stage composite resonance electrode 29a and the output stage composite resonance electrode 29b was 0.13 mm. Resonance auxiliary electrodes 32a and 32b are arranged at a location 0.2 mm away from the other ends of the first resonance electrodes 30a and 30b, respectively, and have a width of 0.2 mm and a length of 0.25 mm, and then the first resonance. A rectangular shape having a width of 0.2 mm toward the electrodes 30a and 30b and a length of 0.4 mm was joined. The resonance auxiliary electrodes 32c and 32d are each a rectangle having a width of 0.29 mm and a length of 0.3 mm arranged at a distance of 0.2 mm from the other end of the first resonance electrodes 30c and 30d, and then the first resonance. A rectangular shape having a width of 0.2 mm toward the electrodes 30c and 30d and a length of 0.4 mm was joined. The first input coupling electrode 40a and the first output coupling electrode 40b have a rectangular shape with a width of 0.15 mm and a length of 3.7 mm. The second input coupling electrode 41a has a rectangular shape with a width of 0.25 mm and a length of 0.6 mm. The second input coupling electrode 41a has a portion of the first input coupling electrode 40a facing the first resonance electrode 30a via the input side connection conductor 43a. It was connected to the position of 0.57 mm from the center to the side opposite to the electric signal input point 45a. The second output coupling electrode 41b has a rectangular shape with a width of 0.25 mm and a length of 0.6 mm. The second output coupling electrode 41b has a portion of the first output coupling electrode 40b facing the first resonance electrode 30b via the output side connection conductor 43b. It was connected to the position of 0.57 mm from the center to the side opposite to the electrical signal output point 45b. The input coupling auxiliary electrode 46a and the output coupling auxiliary electrode 46b have a rectangular shape with a width of 0.15 mm and a length of 0.9 mm. The input terminal electrode 60a and the output terminal electrode 60b were each a square having a side of 0.2 mm. The outer shape of the first ground electrode 21, the second ground electrode 22, the first annular ground electrode 23 and the second annular ground electrode 24 is a rectangular shape having a width of 4 mm and a length of 5 mm. The opening of the electrode 23 has a rectangular shape with a width of 3.6 mm and a length of 4.2 mm, and the opening of the second annular ground electrode 24 has a rectangular shape with a width of 3.55 mm and a length of 4.2 mm. The overall shape of the bandpass filter was a rectangular parallelepiped shape having a width of 4 mm, a length of 5 mm, and a thickness of 0.51 mm. The distance between the lower surface of the laminate 10 and the interlayer A is 0.155 mm, the distance between the interlayer A and the first interlayer, the distance between the first interlayer and the third interlayer, and the distance between the third interlayer and the interlayer B The distance between the interlayer B and the interlayer C and the distance between the interlayer C and the second interlayer were each 0.015 mm, and the distance between the second interlayer and the top surface of the laminate 10 was 0.19 mm. The thicknesses of the various electrodes were 0.01 mm, and the diameters of the input side connection conductor 43a, the output side connection conductor 43b, and the through conductor 50 were 0.1 mm. The relative dielectric constant of the dielectric layer 11 was 7.5.

  FIG. 14 is a graph showing the simulation results, where the horizontal axis represents frequency and the vertical axis represents attenuation, and shows the pass characteristic (S21) and reflection characteristic (S11) of the bandpass filter. According to the graph shown in FIG. 14, even though the thickness of the laminated body 10 is as thin as 0.51 mm, the impedance is well matched over the entire two very wide passbands, and it is flat and has low loss. Excellent passing characteristics are obtained. As a result, according to the band-pass filter of the present invention, it is found that an excellent pass characteristic that is flat and has low loss over the entire two wide pass bands can be obtained even with a very thin shape. The effectiveness of the invention was confirmed. It was confirmed that substantially the same pass characteristics were obtained in the bandpass filter of the first example shown in FIGS. 1 to 4 and the bandpass filter of the second example shown in FIGS. .

It is an external appearance perspective view which shows typically an example of embodiment of the band pass filter of this invention. It is a typical exploded perspective view of the example of the band pass filter shown in FIG. It is a top view which shows typically the upper and lower surfaces and interlayer of an example of the band pass filter shown in FIG. FIG. 2 is a cross-sectional view taken along line P-P ′ of the example of the bandpass filter illustrated in FIG. 1. It is an external appearance perspective view which shows typically the other example of embodiment of the band pass filter of this invention. FIG. 6 is a schematic exploded perspective view of the example of the bandpass filter shown in FIG. 5. It is a top view which shows typically the upper and lower surfaces and interlayer of the example of a band pass filter shown in FIG. FIG. 6 is a cross-sectional view taken along the line Q-Q ′ of the example of the bandpass filter illustrated in FIG. 5. It is an external appearance perspective view which shows typically the further another example of embodiment of the band pass filter of this invention. FIG. 10 is a schematic exploded perspective view of the example of the bandpass filter shown in FIG. 9. FIG. 10 is a plan view schematically showing upper and lower surfaces and layers of the example of the bandpass filter shown in FIG. 9. FIG. 10 is a cross-sectional view taken along line R-R ′ of the example of the bandpass filter illustrated in FIG. 9. It is a block diagram which shows the structural example of the radio | wireless communication module and radio | wireless communication apparatus using the band pass filter of this invention. It is a figure which shows the simulation result of the electrical property of the band pass filter of this invention.

Explanation of symbols

10: Laminate
11: Dielectric layer
21: First ground electrode
22: Second ground electrode
27: Base
28a, 28b: protrusion
29a, 29b: Composite resonant electrode
30a, 30b, 30c, 30d: Single resonant electrode
40a: first input coupling electrode
40b: first output coupling electrode
41a: second input coupling electrode
41b: second output coupling electrode
43a: Input side connection conductor
43b: Output side connection conductor
45a: Electric signal input point
45b: Electrical signal output point
80: Wireless communication module
81: Baseband
82: RF section
84: Antenna
85: Wireless communication equipment

Claims (6)

A laminate in which a plurality of dielectric layers are laminated;
The first ground electrode disposed on the lower surface of the multilayer body and the second ground electrode disposed on the upper surface are disposed side by side so as to be electromagnetically coupled to each other between the first layers of the multilayer body. A plurality of strip-shaped single resonant electrodes each serving as a resonator that is grounded at one end and resonates at a first frequency;
One end of the base becomes one end by a base portion whose one end is grounded and a plurality of band-shaped protrusions arranged side by side with each one end connected to the other end of the base portion, and the other end of the protrusion portion Is configured to be the other end, and the one end is grounded, so that the whole of the base and the protrusion functions as a resonator that resonates at a second frequency higher than the first frequency. In addition, the protrusions function as a resonator that resonates at a third frequency higher than the second frequency, and are electromagnetically coupled to each other in a second layer different from the first layer of the stacked body. A plurality of composite resonant electrodes arranged side by side,
The length direction of the single resonance electrode of the input stage among the plurality of single resonance electrodes disposed between the first layer and the second layer of the multilayer body. A band-shaped first input coupling electrode having an electric signal input point to which an electric signal is input, and being electromagnetically coupled to face the region over half of
Electromagnetically coupled opposite to the region extending over half the length direction of the single resonance electrode of the output stage among the plurality of single resonance electrodes disposed between the third layers of the laminate, A strip-shaped first output coupling electrode having an electrical signal output point from which an electrical signal is output;
Of the plurality of protrusions in the composite resonance electrode of the input stage among the plurality of composite resonance electrodes, disposed between the first layer and the second layer of the laminate. A second input coupling electrode that is electromagnetically coupled to the projection of the input stage that is the projection located at a position farthest from the adjacent composite resonance electrode ;
Of the plurality of protrusions in the composite resonance electrode of the output stage among the plurality of composite resonance electrodes, disposed between the first layer and the second layer of the multilayer body , A second output coupling electrode that is electromagnetically coupled opposite the projection of the output stage, which is the projection located at a position farthest from the adjacent composite resonance electrode ;
The plurality of single resonance electrodes and the plurality of protrusions in the plurality of composite resonance electrodes are arranged to be orthogonal to each other when viewed from the stacking direction of the stack, and the second input coupling electrode is The first input coupling electrode is connected to the side farther from the electric signal input point than the center in the length direction at the portion facing the single resonance electrode of the input stage, and is electrically connected via the first input coupling electrode. While the signal is input, the second output coupling electrode is farther from the electrical signal output point than the center in the length direction at the portion of the first output coupling electrode facing the single resonance electrode of the output stage. A band-pass filter connected to the side and outputting an electric signal through the first output coupling electrode. It said second input coupling electrode, when viewed from the laminate direction of the laminate are arranged to intersect with the previous SL one end side of the single resonance electrode of the input stage, the second output coupling electrode bandpass filter according to claim 1, characterized in that it is arranged so as to intersect with the previous SL one end side of the single resonance electrode of the output stage when viewed from the laminate direction of the laminate.   The second input coupling electrode is disposed between the third layers and integrated with the first input coupling electrode, and the second output coupling electrode is disposed between the third layers and the first layer. The band-pass filter according to claim 1, wherein the band-pass filter is integrated with the output coupling electrode.   The second input coupling electrode is disposed between layers closer to the second layer than the third layer, and is connected to the first input coupling electrode via an input-side connection conductor. The output coupling electrode is disposed between layers closer to the second layer than the third layer, and is connected to the first output coupling electrode via an output-side connection conductor. The band-pass filter according to claim 1 or 2.   A wireless communication module comprising the bandpass filter according to any one of claims 1 to 4.   An RF unit including the bandpass filter according to claim 1, a baseband unit connected to the RF unit, and an antenna connected to the RF unit. Wireless communication equipment.

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