JP4949213B2 - BANDPASS FILTER, HIGH FREQUENCY MODULE USING SAME, AND RADIO COMMUNICATION DEVICE USING THE SAME - Google Patents

Description

  The present invention relates to a band-pass filter having a very wide pass band that can be suitably used particularly for UWB (Ultra Wide Band), a high-frequency module using the same, 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. For example, according to the US FCC (Federal Communication Commission) regulation, a frequency band of 3.1 to 10.6 GHz is realized. It is planned to be used. Thus, the feature of UWB is that it uses a very wide frequency band.

  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 wide band 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 a microstrip-CPW broadside coupling structure” March 2005 Proceedings of the IEICE General Conference C-2-114 p. 147 JP 2004-180032 A

  However, each of the bandpass filters described above has problems, and is not suitable for a UWB bandpass filter.

  For example, the bandpass filter proposed in Non-Patent Document 1 has a problem that the passband width is too wide. That is, UWB finally uses the frequency band of 3.1 GHz to 10.6 GHz, but initially it is planned to use the frequency band of 3.1 GHz to 4.9 GHz, which is 45% in the specific band. . Therefore, a filter used for this is required to have a pass bandwidth of about 40% in a specific band. Moreover, it is necessary to consider the influence between W-LAN (802.11.a), and attenuation at 5.15 GHz is required. Therefore, the bandpass filter proposed in Non-Patent Document 1 having a characteristic that the passband width exceeds 100% in the specific band cannot be used because the passband 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 widened, it is 10 in a specific band. It was less than%. Therefore, it could not be used as a UWB band-pass filter that requires a wide pass bandwidth corresponding to 40% of the specific band.

  The present invention has been devised in view of such problems in the prior art, and an object thereof is a bandpass filter having an ultra-wideband and an appropriate passband as a UWB bandpass filter. Another object of the present invention is to provide a high-frequency module using the same and a wireless communication device using the same.

The band-pass filter of the present invention includes a laminated body in which a plurality of dielectric layers are laminated, a first ground electrode that is disposed on the lower surface of the laminated body and connected to a ground potential, and an upper surface of the laminated body A half-wavelength resonance including a second ground electrode connected to a ground potential and at least an input stage resonance electrode and an output stage resonance electrode arranged in parallel between one layer of the laminate. A plurality of strip-shaped resonance electrodes functioning as a container, an annular earth electrode surrounding the plurality of resonance electrodes, disposed between the one layer of the multilayer body, and an interlayer above the one layer of the multilayer body A first input side coupling electrode that is electromagnetically coupled to one end side region on one end side from the center in the length direction of the input stage resonance electrode, and the length of the input stage resonance electrode The other end side area of the other end side from the center of the direction A second input-side coupling electrode facing and electromagnetically coupled to each other, and disposed between the upper layer of the multilayer body so as to face the annular ground electrode, and each of the plurality of resonance electrodes A plurality of auxiliary resonance electrodes connected to one end and the other end via through conductors, and the total length of the input stage resonance electrode from one end of the input stage resonance electrode of the first input side coupling electrodes. The first signal input point is provided in a region opposite to the region up to ¼, and the entire length of the input stage resonance electrode is one of the second input side coupling electrodes from the other end of the input stage resonance electrode. / 4 to the region facing the region has a second signal input points, and have a signal output point on one end or the other end of the output-stage resonance electrode, the one of layers of the laminate Placed between the upper layers A first input point, a first connection point connected to the first signal input point through a through conductor, and a first auxiliary resonance connected to the one end of the input stage resonance electrode. A first auxiliary input-side coupling electrode having a region facing the electrode, a second input point to which a signal is input, and a second connection connected to the second signal input point through a through conductor those points and, wherein said second Rukoto further comprise an auxiliary input coupling electrode having a region facing the second auxiliary resonance electrode connected to the other end of said input-stage resonance electrode It is.

  Further, in the above configuration, one of the output stage resonance electrodes arranged in the same layer as the layer where the first input side coupling electrode and the second input side coupling electrode are arranged from the center in the length direction. A first output-side coupling electrode that electromagnetically couples opposite to one end-side region on the end side; and an electromagnetic field opposite to the other end-side region on the other end side from the center in the length direction of the output stage resonance electrode. And a second output-side coupling electrode to be coupled.

Still further, in the above-described configuration, the third auxiliary resonance electrode is arranged between the upper layers of the multilayer body and connected to one end of the output stage resonance electrode on one end side. The first output-side coupling electrode has a region that is opposite to the region from one end of the output stage resonance electrode to ¼ of the total length of the output stage resonance electrode, and the other through a through conductor. A first auxiliary output side coupling electrode having an end connected thereto, and a region facing one end side of the fourth auxiliary resonance electrode connected to the other end of the output stage resonance electrode, and the second output A second auxiliary output in which the other end of the side coupling electrode is connected to a region facing the region from the other end of the output stage resonant electrode to ¼ of the total length of the output stage resonant electrode via a through conductor. And a side coupling electrode.

The band-pass filter of the present invention includes a laminated body in which a plurality of dielectric layers are laminated, a first ground electrode disposed on the lower surface of the laminated body and connected to a ground potential, and the laminated body. A ½ wavelength including a second ground electrode connected to the ground potential disposed on the upper surface and at least an input stage resonant electrode and an output stage resonant electrode disposed in parallel between one layer of the laminate. A plurality of strip-shaped resonance electrodes functioning as resonators, an annular ground electrode disposed between the one layer of the multilayer body, and surrounding the plurality of resonance electrodes, and above the one layer of the multilayer body A first input-side coupling electrode that is disposed between the layers and that is electromagnetically coupled to one end side region on one end side from the center in the length direction of the input-stage resonance electrode; and a length of the input-stage resonance electrode The other end side of the other end side from the center in the vertical direction A second input-side coupling electrode that is electromagnetically coupled opposite the region, and a first output that is electromagnetically coupled opposite one region on one end side from the center in the length direction of the output stage resonance electrode A side coupling electrode, a second output side coupling electrode that is electromagnetically coupled opposite the other end side region from the center in the length direction of the output stage resonance electrode, and the one layer of the multilayer body A plurality of auxiliary resonance electrodes, which are arranged so as to face the annular ground electrode between the upper layers, and are connected to one end and the other end of each of the plurality of resonance electrodes via through conductors, The first input-side coupling electrode has a first signal input point in a region facing a region from one end of the input stage resonant electrode to a quarter of the total length of the input stage resonant electrode, The other end of the input stage resonance electrode among the two input side coupling electrodes A second signal input point in a region facing up to ¼ of the entire length of the input stage resonance electrode, and from one end of the output stage resonance electrode among the first output side coupling electrodes. and have a signal output point in a region a region opposed to the 1/4 of the total length of the output stage resonance electrode, than the one of layers of the laminate arranged on the upper side of the interlayer, the signal is input A first input point connected to the first signal input point via a through conductor, and the first auxiliary connected to the one end of the input stage resonance electrode A first auxiliary input-side coupling electrode having a region facing the resonance electrode; a second input point to which a signal is input; and a second input point connected to the second signal input point through a through conductor Opposing to the connection point and the second auxiliary resonant electrode connected to the other end of the input stage resonant electrode The second further comprise an auxiliary input coupling electrode having a that region is characterized in Rukoto.

  A high-frequency module according to the present invention is characterized by including any of the bandpass filters having the above-described configurations.

  A wireless communication device of the present invention includes an RF unit including the bandpass filter 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.

  According to the present invention, since the first and second input side coupling electrodes and the input stage resonance electrode are coupled in an interdigital manner, the coupling by the magnetic field and the coupling by the electric field are added to produce a strong coupling. As a result, even with a wide pass band far exceeding the range that can be realized with a filter using a conventional quarter wavelength resonator, a flat and low-loss pass characteristic is obtained over the entire pass band. Can have. In addition, according to the present invention, a plurality of auxiliary resonance electrodes connected to one end and the other end of each of the plurality of resonance electrodes by through conductors are provided so that the plurality of auxiliary resonance electrodes face the annular ground electrode. As a result, an electrostatic capacity is generated between the two opposing portions, so that the length of each resonance electrode can be shortened, and a small bandpass filter can be obtained.

  Here, a region facing the auxiliary resonant electrode connected to one end of the input stage resonant electrode is disposed on one end side, disposed between layers above the one layer of the laminate, and a signal is disposed on one end. A first auxiliary input-side coupling electrode having a connection point connected to the first signal input point via a through conductor at the other end, and the input stage resonance electrode on one end side A connection having a region facing the auxiliary resonance electrode connected to the other end of the first electrode, having an input point for inputting a signal at one end, and connected to the second signal input point via a through conductor at the other end When the second auxiliary input side coupling electrode having a point is provided, electromagnetic field coupling occurs between the input stage auxiliary resonance electrode and the auxiliary input side coupling electrode, and the input stage resonance electrode and the input side coupling electrode Is added to the electromagnetic coupling between. As a result, the electromagnetic coupling between the first and second input side coupling electrodes and the input stage resonance electrode is further strengthened, so that a flatter pass characteristic can be provided over the entire wide passband.

  When the first and second output side coupling electrodes are provided in the same arrangement as the first and second input side coupling electrodes, the first and second auxiliary input side coupling electrodes are further arranged in the same arrangement as the first and second auxiliary input side coupling electrodes. When the first and second auxiliary output side coupling electrodes are provided, the bandpass filter can be easily designed.

  Furthermore, according to the present invention, the signal output point is in a region facing the region from one end of the output stage resonant electrode to ¼ of the total length of the output stage resonant electrode among the first output side coupling electrodes. Even with a wide passband far exceeding the range that can be realized with a filter using a conventional quarter wavelength resonator, the pass is flat and low-loss over the entire passband. Can have properties.

  Here, a region facing the auxiliary resonant electrode connected to one end of the input stage resonant electrode is disposed on one end side, disposed between layers above the one layer of the laminate, and a signal is disposed on one end. A first auxiliary input-side coupling electrode having a connection point connected to the first signal input point via a through conductor at the other end, and the input stage resonance electrode on one end side A connection having a region facing the auxiliary resonance electrode connected to the other end of the first electrode, having an input point for inputting a signal at one end, and connected to the second signal input point via a through conductor at the other end A second auxiliary input-side coupling electrode having a point; a region opposite to the auxiliary resonance electrode connected to one end of the output stage resonance electrode on one end side; and an output point from which a signal is output at one end And the other end through the signal output point and the through conductor A first auxiliary output side coupling electrode having a connected connection point; and a region facing one side of the auxiliary resonance electrode connected to the other end of the output stage resonance electrode on one end side; The second auxiliary output side coupling in which the other end of the electrode is connected to the region facing the region from the other end of the output stage resonant electrode to ¼ of the total length of the output stage resonant electrode via a through conductor. When an electrode is provided, electromagnetic field coupling occurs between the input stage auxiliary resonance electrode and the auxiliary input side coupling electrode, and is added to the electromagnetic field coupling between the input stage resonance electrode and the input side coupling electrode. In addition, electromagnetic field coupling occurs between the first output stage auxiliary resonance electrode and the first auxiliary output side coupling electrode, and electromagnetic field coupling between the output stage resonance electrode and the first output side coupling electrode occurs. Is added. As a result, electromagnetic field coupling between the first and second input side coupling electrodes and the input stage resonance electrode, and electromagnetic field coupling between the first output side coupling electrode and the output stage resonance electrode are further enhanced. A flatter pass characteristic can be obtained over the entire wide passband.

  Further, according to the high-frequency module of the present invention and the wireless communication device of the present invention, the band-pass filter of the present invention in which the loss of the signal passing over the entire communication band is small is used for filtering the transmission signal and / or the reception signal. As a result, the attenuation of the reception signal and / or transmission signal passing through the band-pass filter is reduced, so that the reception sensitivity is improved, and the amplification degree of the transmission signal and the reception signal can be reduced. Less. Therefore, a high-performance high-frequency module and wireless communication device with high reception sensitivity and low power consumption can be obtained.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of a band-pass filter of the present invention, a high-frequency module using the same, and a wireless communication device using the same will be described in detail with reference to the accompanying drawings.

  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 bandpass filter shown in FIG. FIG. 3 is a plan view schematically showing the upper and lower surfaces of the bandpass filter shown in FIG. 1 and one surface between layers. 4A is a cross-sectional view taken along line AA of the bandpass filter shown in FIG. 1, and FIG. 4B is a cross-sectional view taken along line BB of the bandpass filter shown in FIG.

  The band-pass filter of this embodiment shown in FIGS. 1 to 4 includes a laminate 10 in which a plurality of dielectric layers 11 are laminated, a first ground electrode 21 disposed on the lower surface of the laminate 10, and a laminate. A second ground electrode 22 disposed on the upper surface of the band 10, a band-shaped input stage resonance electrode 30a and an output stage resonance electrode 30b functioning as a half-wave resonator disposed between one layer of the laminate 10, A band-shaped middle-stage resonance electrode that functions as a half-wave resonator disposed between the input-stage resonance electrode 30a and the output-stage resonance electrode 30b and electromagnetically couples to the input-stage resonance electrode 30a and the output-stage resonance electrode 30b. 30c, and an annular ground electrode 23 formed so as to surround the resonance electrode input stage resonance electrode 30a, the output stage resonance electrode 30b, and the middle stage resonance electrode 30c).

  The first ground electrode 21 is formed on the entire lower surface of the multilayer body 10, and the second ground electrode 22 is formed on the first input terminal electrode 60a, the second input terminal electrode 60c, and the output terminal electrode 60b on the upper surface of the multilayer body 10. They are arranged on almost the entire surface excluding their surroundings, all connected to the ground potential, and constitute a stripline resonator together with the input stage resonance electrode 30a, the output stage resonance electrode 30b, and the middle stage resonance electrode 30c. That is, the input stage resonant electrode 30a, the output stage resonant electrode 30b, and the middle stage resonant electrode 30c constitute a stripline resonator together with the first ground electrode 21 and the second ground electrode 22, and are a 1/2 wavelength resonator. Function as.

  The input stage resonance electrode 30a, the output stage resonance electrode 30b, and the middle stage resonance electrode 30c that function as a half-wave resonator are two resonance electrodes that each function as a quarter-wave resonator in the length direction. It corresponds to. That is, one end side region (for 1/4 wavelength) on one end side from the center in the length direction of the input stage resonance electrode 30a and one end side on one end side from the center in the length direction of the output stage resonance electrode 30b. The region (for ¼ wavelength) and the one end side region (for ¼ wavelength) on one end side from the center in the length direction of the middle-stage resonant electrode 30c disposed therebetween are electromagnetically coupled to each other. (Edge coupling). Further, the other end side region (for ¼ wavelength) on the other end side from the center in the length direction of the input stage resonance electrode 30a, and the other end side on the other end side from the center in the length direction of the output stage resonance electrode 30b. The region (for ¼ wavelength) and the other end side region (for ¼ wavelength) on the other end side from the center in the length direction of the middle-stage resonance electrode 30c disposed therebetween are electromagnetically coupled to each other. (Edge coupling).

  Here, a stronger coupling can be obtained when the distance between the middle-stage resonance electrode 30c and the input-stage resonance electrode 30a or the output-stage resonance electrode 30b is smaller. However, if the distance is reduced, manufacturing becomes difficult. It is set to about 0.5 mm.

  The annular ground electrode 23 is formed between the resonance electrodes (input stage resonance electrodes) in the same layer as the plurality of resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, middle stage resonance electrode 30c) of the laminate 10. Electrode 30a, output stage resonance electrode 30b, and middle stage resonance electrode 30c). The annular ground electrode 23 itself is connected to the ground potential.

  The annular ground electrode 23 surrounds the input stage resonance electrode 30a, the output stage resonance electrode 30b, and the middle stage resonance electrode 30c in a ring shape, thereby surrounding the electromagnetic waves generated from the input stage resonance electrode 30a, the output stage resonance electrode 30b, and the middle stage resonance electrode 30c. Leakage can be reduced. This effect is particularly useful for preventing adverse effects on other regions of the module substrate when the band-pass filter is formed in a partial region of the module substrate.

  In addition, the band-pass filter of this embodiment has an input between layers above the layers where a plurality of resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, middle stage resonance electrode 30c) and annular ground electrode 23 are arranged. The strip-shaped first input-side coupling electrode 40a and the second input-side coupling electrode 40c disposed so as to face the stage resonance electrode 30a, and the strip-shaped first disposed so as to face the output stage resonance electrode 30b. Output side coupling electrode 40b and second output side coupling electrode 40d.

  The first input side coupling electrode 40a and the second input side coupling electrode 40c are arranged with a plurality of resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, middle stage resonance electrode 30c) and the annular ground electrode 23. Each layer is disposed between the layers above the layers so as to oppose the input stage resonance electrode 30a and to be electromagnetically coupled. Specifically, the first input side coupling electrode 40a is disposed so as to be electromagnetically coupled facing one end side region of the input stage resonance electrode 30a, and the second input side coupling electrode 40c is the input stage resonance electrode. It arrange | positions so that it may oppose and oppose the other end side area | region of 30a. Therefore, the first input side coupling electrode 40a and one end side region of the input stage resonance electrode 30a and the second input side coupling electrode 40c and the other end side region of the input stage resonance electrode 30a are broadside coupled. Therefore, it is strongly coupled as compared with the case of edge coupling.

  Further, the first input side coupling electrode 40a is provided on the upper surface of the multilayer body 10 by through conductors 52a and 53a (shown by dotted lines in FIG. 2) and a first auxiliary input side coupling electrode 41a described later. The first input terminal electrode 60a is electrically connected, and the second input side coupling electrode 40c is a through conductor 52c, 53c (shown by a dotted line in FIG. 2) and a second auxiliary input side coupling electrode described later. The second input terminal electrode 60c provided on the upper surface of the multilayer body 10 is electrically connected by 41c. Here, the first signal input point 71a, which is a point where the first input side coupling electrode 40a and the through conductor 52a are connected, is connected to one end of the input stage resonance electrode 30a in the first input side coupling electrode 40a. It is important that the input stage resonance electrode 30a is provided in a region facing a region of up to ¼ of the entire length, and in this embodiment, the input stage resonance electrode 30a is positioned to face one end of the input stage resonance electrode 30a. Further, the second signal input point 71c, which is a point where the second input side coupling electrode 40c and the through conductor 52c are connected, is connected to the second input side coupling electrode 40c from the other end of the input stage resonance electrode 30a. It is important that the input stage resonance electrode 30a is provided in a region facing the region up to ¼ of the entire length of the input stage resonance electrode 30a. In this embodiment, the input stage resonance electrode 30a is at a position facing the other end of the input stage resonance electrode 30a. Note that the opposite end (the other end) of the first input side coupling electrode 40a and the second input side coupling electrode 40c is an open end. The balanced electrical signal input from the external circuit is supplied from the first signal input point 71a to the first input side coupling electrode 40a and from the second signal input point 71c to the second input side coupling. It is supplied to the electrode 40c.

  As a result, the first input side coupling electrode 40a and the one end side region of the input stage resonance electrode 30a are coupled in an interdigital manner, and the second input side coupling electrode 40c and the other end side region of the input stage resonance electrode 30a are coupled. Is coupled to the interdigital type, and the coupling by the magnetic field and the coupling by the electric field are added, and the coupling is stronger than the case of coupling to the combline type or simply capacitive coupling. As described above, the first input side coupling electrode 40a is broad-side coupled and interdigitally coupled to one end side region of the input stage resonance electrode 30a over the whole, and one end of the input stage resonance electrode 30a. Very tightly coupled with the side area. Similarly, the second input side coupling electrode 40c is very strongly coupled to the other end side region of the input stage resonance electrode 30a.

  On the other hand, the first output side coupling electrode 40b and the second output side coupling electrode 40d are arranged with a plurality of resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, middle stage resonance electrode 30c) and the annular ground electrode 23. Each of the layers is arranged so as to be electromagnetically coupled to the output layer above the output layer resonance electrode 30b. Specifically, the first output-side coupling electrode 40b is disposed so as to be electromagnetically coupled facing the one end side region of the output stage resonance electrode 30b, and the second output-side coupling electrode 40d is the output stage resonance electrode. It arrange | positions so that it may oppose and oppose the other end side area | region of 30b. The first output side coupling electrode 40b and the second output side coupling electrode 40d do not have to be arranged in the present invention, but by arranging in this way, compared to the case where they are not arranged. Therefore, the filter design becomes easy.

  Further, the output stage resonance electrode 30b is an output terminal electrode provided on the upper surface of the multilayer body 10 by through conductors 51b, 52e, 53b (shown by dotted lines in FIG. 2) and a first output stage auxiliary resonance electrode 31b described later. The first output side coupling electrode 40b and the second output side coupling electrode 40d are not connected to the through conductor 51b but are formed independently. Here, a signal output point 72b, which is a point where the first output side coupling electrode 40b and the through conductor 51b are connected, is provided at one end of the output stage resonance electrode 30b. The unbalanced electrical signal output to the external circuit is output from one end (signal output point 72b) of the output stage resonance electrode 30b.

  Here, the balanced electrical signal input from the external circuit is supplied to the desired positions of the first input side coupling electrode 40a and the second input side coupling electrode 40c, but is unbalanced that is output to the external circuit. The type electric signal is extracted from one end or the other end of the output stage resonance electrode 30b without being extracted from the first output side coupling electrode 40b and the second output resonance coupling electrode 40d. The balanced type electric signal supplied from the first input terminal electrode 60a to the first input side coupling electrode 40a and the balanced type electric signal supplied from the second input terminal electrode 60c to the second input side coupling electrode 40c. In the present embodiment, in order to make the total of each power the power of the unbalanced electrical signal output to the output terminal electrode 60b, that is, to bring the unbalanced electrical signal closer to twice the power of the balanced electrical signal. A structure is adopted in which one end (signal output point 72b) of the output stage resonance electrode 30b is connected to the output terminal electrode 60b by through conductors 51b, 52b, 53b and a first output stage auxiliary resonance electrode 31b described later. As a result, reverse-phase electrical signals, that is, balanced electrical signals input from an external circuit and transmitted from the first input-side coupling electrode 40a to the input stage resonance electrode 30a, the middle stage resonance electrode 30c, and the output stage resonance electrode 30b, The balanced electric signal input from the external circuit and transmitted from the second input side coupling electrode 40c to the input stage resonance electrode 30a, the middle stage resonance electrode 30c, and the output stage resonance electrode 30b is in phase with the output stage resonance electrode 30b. And output as an unbalanced electrical signal.

  With such a structure, even in a wide passband far exceeding the range that can be realized by a filter using a conventional quarter wavelength resonator, the entire passband is flat and has low loss. It can have pass characteristics.

  In addition, it is preferable that the shape dimensions of the first input side coupling electrode 40a and the second input side coupling electrode 40c are set to the same level as the input stage resonance electrode 30a in combination of the two, and the first output The shape and dimensions of the side coupling electrode 40b and the second output side coupling electrode 40d are preferably set to the same level as that of the output stage resonance electrode 30b. Here, in FIG. 2 and FIG. 3, the length of the first input side coupling electrode 40a and the length of the first output side coupling electrode 40b are shown differently. Has been.

  Further, the distance between the first input side coupling electrode 40a and the second input side coupling electrode 40c and the input stage resonance electrode 30a, the first output side coupling electrode 40b and the second output side coupling electrode 40d, and the output stage The distance from the resonance electrode 30b is set to, for example, about 0.01 to 0.5 mm because the coupling becomes stronger but difficult to manufacture if the distance is reduced.

  Furthermore, the band-pass filter of this embodiment includes a plurality of resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, and The first input-side coupling electrode 40a, the second input-side coupling electrode 40c, the first output-side coupling electrode 40b, and the first The first input stage auxiliary resonance electrode 31a, the second input stage auxiliary resonance electrode 31c, the first output stage auxiliary resonance electrode 31b, and the second layer are provided between the same layers as the two output side coupling electrodes 40d. Output stage auxiliary resonance electrode 31d, first middle stage auxiliary resonance electrode 31e, and second middle stage auxiliary resonance electrode 31f.

  The first input stage auxiliary resonant electrode 31a is connected to one end of the input stage resonant electrode 30a by the through conductor 51a, and the second input stage auxiliary resonant electrode 31c is connected to the other end of the input stage resonant electrode 30a by the through conductor 51c. Each of the input stage auxiliary resonance electrodes 31 a and 31 c has a region facing the annular ground electrode 23.

  The first output stage auxiliary resonance electrode 31b is connected to one end of the output stage resonance electrode 30b by a through conductor 51b, and the second output stage auxiliary resonance electrode 31d is connected to the other end of the output stage resonance electrode 30b by a through conductor 51d. Each of the output stage auxiliary resonance electrodes 31 b and 31 d has a region facing the annular ground electrode 23.

  The first intermediate auxiliary resonance electrode 31e is connected to one end of the intermediate resonance electrode 30c by the through conductor 51e, and the second intermediate auxiliary resonance electrode 31f is connected to the other end of the intermediate resonance electrode 30c by the through conductor 51f. Each of the middle auxiliary resonance electrodes 31 e and 31 f has a region facing the annular ground electrode 23.

  According to this structure, capacitance is generated between the annular ground electrode 23 and the annular ground electrode 23 in a region facing the annular ground electrode 23, thereby causing a plurality of resonance electrodes (input stage resonance electrode 30 a, output stage resonance electrode 30 b, middle stage). Since the length of the resonant electrode 30c) can be shortened, a small bandpass filter can be obtained.

The first input stage auxiliary resonance electrode 31a, the second input stage auxiliary resonance electrode 31c, the first output stage auxiliary resonance electrode 31b, the second output stage auxiliary resonance electrode 31d, and the first middle stage auxiliary resonance electrode 31e. The area of the region where the ^second intermediate auxiliary resonance electrode 31f faces the annular ground electrode 23 is set to, for example, about 0.01 to ³ mm ² in consideration of the necessary size and the obtained capacitance. Further, the first input stage auxiliary resonance electrode 31a, the second input stage auxiliary resonance electrode 31c, the first output stage auxiliary resonance electrode 31b, the second output stage auxiliary resonance electrode 31d, and the first middle stage auxiliary resonance electrode 31e. The smaller the distance between the second intermediate auxiliary resonance electrode 31f and the annular ground electrode 23, the larger the capacitance can be. However, it is difficult to manufacture, for example, about 0.01 to 0.5 mm. Set to

  Further, the band-pass filter of this embodiment includes an auxiliary input side coupling electrode and an auxiliary output side coupling electrode in addition to the above-described configuration.

  Specifically, an interlayer above the layer provided with the first input side coupling electrode 40a and the second input side coupling electrode 40c, the first output side coupling electrode 40b and the second output side coupling electrode 40d. Are provided with a strip-shaped first auxiliary input-side coupling electrode 41a, a strip-shaped second auxiliary input-side coupling electrode 41c, a strip-shaped first auxiliary output-side coupling electrode 41b, and a second auxiliary output-side coupling electrode 41d. Yes.

  The first auxiliary input side coupling electrode 41a is opposed to a region from one end of the input stage resonance electrode 30a in the first input side coupling electrode 40a to ¼ of the entire length of the input stage resonance electrode 30a by the through conductor 52a. The first input stage auxiliary resonance electrode 31a is disposed opposite to the first input stage auxiliary resonance electrode 31a. In other words, the first input stage auxiliary resonance electrode 31a is opposed to the first input stage auxiliary resonance electrode 31a. A balanced electric signal is supplied to the first input side coupling electrode 40a (first signal input point 71a) via the first auxiliary input side coupling electrode 41a. The first auxiliary input side coupling electrode 41a has an input point (a point connected to the first input terminal electrode 60a through the through conductor 53a) at one end and a first input at the other end. The auxiliary resonance electrode (first input stage auxiliary resonance electrode 31a) is connected to one end of the input stage resonance electrode 30a on one end side. And a region opposite to each other.

  As a result, the first auxiliary input side coupling electrode 41a connected to the first input side coupling electrode 40a and the first input stage auxiliary resonance electrode 31a connected to the input stage resonance electrode 30a are broadside coupled. Since this coupling is added to the coupling between the first input side coupling electrode 40a and the input stage resonance electrode 30a, the coupling is stronger as a whole. Further, the one end side region of the input stage resonance electrode 30a and the joined body of the first input stage auxiliary resonance electrode 31a connected thereto, the first input side coupling electrode 40a and the first auxiliary connected to the first input stage auxiliary resonance electrode 31a. Since the joined body of the input side coupling electrode 41a is coupled in an interdigital manner as a whole, strong coupling is obtained by adding coupling by a magnetic field and coupling by an electric field. Therefore, in the length direction of the first auxiliary input side coupling electrode 41a, it is stronger than the case where it is connected to the input terminal electrode 60a on the same side as the side connected to the first input side coupling electrode 40a. Bonding can be realized.

  The second auxiliary input side coupling electrode 41c is a region extending from the other end of the input stage resonance electrode 30a in the second input side coupling electrode 40c to ¼ of the entire length of the input stage resonance electrode 30a by the through conductor 52c. And is disposed so as to face the second output stage auxiliary resonant electrode 31c, in other words, has a region facing the second input stage auxiliary resonant electrode 31c. . A balanced electric signal is supplied to the second input side coupling electrode 40c (second signal input point 71c) via the second auxiliary input side coupling electrode 41c. The second auxiliary input side coupling electrode 41c has an input point (a point connected to the second input terminal electrode 60c via the through conductor 53c) at one end and a second end at the other end. The auxiliary resonance electrode (second input stage auxiliary resonance electrode 31c) having a connection point connected to the other signal input point 71c via the through conductor 52c and connected to the other end of the input stage resonance electrode 30a on one end side. And a region opposite to each other.

  As a result, the second auxiliary input side coupling electrode 41c connected to the second input side coupling electrode 40c and the second input stage auxiliary resonance electrode 31c connected to the input stage resonance electrode 30a are broadside coupled. Since this coupling is added to the coupling between the second input side coupling electrode 40c and the input stage resonance electrode 30a, the coupling is stronger as a whole. Further, the other end side region of the input stage resonance electrode 30c and the joined body of the second input stage auxiliary resonance electrode 31c connected thereto, the second input side coupling electrode 40c, and the second auxiliary connected to this Since the joined body of the input side coupling electrode 41c is coupled in an interdigital manner as a whole, strong coupling is obtained by adding coupling by a magnetic field and coupling by an electric field. Therefore, in the length direction of the second auxiliary input side coupling electrode 41c, it is stronger than the case where it is connected to the input terminal electrode 60a on the same side as the side connected to the second input side coupling electrode 40c. Bonding can be realized.

  On the other hand, the first auxiliary output side coupling electrode 41b is a region extending from one end of the output stage resonance electrode 30b in the first output side coupling electrode 40b to ¼ of the total length of the output stage resonance electrode 30b by the through conductor 52b. And is disposed so as to face the first output stage auxiliary resonance electrode 31b, in other words, has a region facing the first output stage auxiliary resonance electrode 31b. .

  The second auxiliary output side coupling electrode 41d is a region extending from the other end of the output stage resonance electrode 30b in the second output side coupling electrode 40d to ¼ of the total length of the output stage resonance electrode 30b by the through conductor 52d. And is disposed so as to face the second output stage auxiliary resonance electrode 31d, in other words, has a region facing the second output stage auxiliary resonance electrode 31d. .

  An unbalanced electrical signal is output from one end of the output stage resonance electrode 30b through the through conductor 51b, the first output stage auxiliary resonance electrode 31b, the through conductor 52e, the through conductor 53b, and the output terminal electrode 60b. It is like that.

  According to such a structure, even in a very wide pass band, the increase in insertion loss at a frequency located between the resonance frequencies of the respective resonance modes is further reduced, and the increase over the entire wide pass band. A bandpass filter having a flat and lower loss pass characteristic can be obtained.

  The widths of the first auxiliary input side coupling electrode 41a, the second auxiliary input side coupling electrode 41c, the first auxiliary output side coupling electrode 41b, and the second auxiliary output side coupling electrode 41d are, for example, the first The input side coupling electrode 40a, the second input side coupling electrode 40c, the first output side coupling electrode 40b, and the second output side coupling electrode 40d are set to the same extent. The lengths of the first auxiliary input side coupling electrode 41a, the second auxiliary input side coupling electrode 41c, the first auxiliary output side coupling electrode 41b, and the second auxiliary output side coupling electrode 41d are, for example, The input stage auxiliary resonance electrode 31a, the first output stage auxiliary resonance electrode 31b, the second input stage auxiliary resonance electrode 31c, and the second output stage auxiliary resonance electrode 31d are set slightly longer. A first auxiliary input side coupling electrode 41a, a second auxiliary input side coupling electrode 41c and a first auxiliary output side coupling electrode 41b, a second auxiliary output side coupling electrode 41d and a first input stage auxiliary resonance electrode 31a; Although it is desirable that the distance between the first output stage auxiliary resonance electrode 31b, the second input stage auxiliary resonance electrode 31c, and the second output stage auxiliary resonance electrode 31d is smaller, it causes strong coupling. Since it becomes difficult, for example, it is set to about 0.01 to 0.5 mm.

  In this way, according to the bandpass filter of this embodiment, it is flat over the entire region of a very wide passband that far exceeds the region that could be realized by a filter using a conventional quarter wavelength resonator. It is possible to obtain a high-performance bandpass filter that can be suitably used as a UWB filter and has a low-loss pass characteristic.

In the present invention, the input (for example, the input stage resonance electrode 30a) may also serve as the output function, and the output (for example, the output stage resonance electrode 30b) may also serve as the input function . Also, as a plurality of resonance electrodes, but in addition to middle resonance electrode 30c of the input stage resonance electrode 30a output stage resonance electrode 30b indicates the arrangement provided one, the pass bandwidth required as a band-pass filter In addition, the middle resonance electrode 30c may not be provided, or two or more may be provided.

  The first and second input side coupling electrodes 40a and 40c, the first and second output side coupling electrodes 40b and 40d, and the auxiliary resonance electrodes 31a, 31b, 31c, 31d, and 31e are arranged in the same layer. However, they may be placed between different layers.

  1 to 4, the unbalanced electrical signal is extracted from one end or the other end of the output stage resonance electrode 30b. However, the present invention is not limited to this configuration. Specifically, as shown in FIGS. 5 and 6, the output stage of the first output side coupling electrode 40b is similar to the configuration having the first signal input point 71a in the first input side coupling electrode 40a. A signal output point 73b is provided in a region facing one quarter of the total length of the output stage resonance electrode 30b from one end of the resonance electrode 30b, and an unbalanced electric signal is output from this signal output point. It may be like this.

  Further, first and second auxiliary input side coupling electrodes 41a and 41c, first and second auxiliary output side coupling electrodes 41b and 41d are provided, and the first auxiliary output side from the first output side coupling electrode 40b is provided. An unbalanced electrical signal may be output via the coupling electrode 41b.

  Furthermore, although not shown, the first input stage auxiliary resonance electrode 31a, between the layers provided above the plurality of resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, middle stage resonance electrode 30c), A first output stage auxiliary resonance electrode 31b, a second input stage auxiliary resonance electrode 31c, a second output stage auxiliary resonance electrode 31d, a first middle stage auxiliary resonance electrode 31e, and a second middle stage auxiliary resonance electrode 31f are provided. In addition, the input stage auxiliary resonant electrode, the output stage auxiliary resonant electrode, and the middle stage auxiliary are also provided in layers below the layers where the resonant electrodes (input stage resonant electrode 30a, output stage resonant electrode 30b, middle stage resonant electrode 30c) are provided. A resonant electrode may be provided. Thus, when the capacitance is increased, the resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, middle stage resonance electrode 30c) can be further shortened, and when the capacitance is not increased. The area of the auxiliary resonant electrode can be reduced, and in any case, a smaller bandpass filter can be obtained.

  Further, the first auxiliary input side coupling electrode 41a and the second auxiliary input side coupling provided in a different layer from the layer in which the first auxiliary input side coupling electrode 41a and the second auxiliary input side coupling electrode 41c are provided. The first input stage provided between layers connected to the electrode 41c through a through conductor and a layer different from the layer provided with the first input stage auxiliary resonance electrode 31a and the second input stage auxiliary resonance electrode 31c. By arranging the auxiliary resonance electrode 31a and the electrode connected to the second input stage auxiliary resonance electrode 31c through a through conductor so as to face each other between different layers, the first input side coupling electrode 40a (second Input side coupling electrode 40c) and first auxiliary input side coupling electrode 41a (second auxiliary input side coupling electrode 41c), input stage resonance electrode 30a, and first input stage auxiliary resonance electrode 31a (second input stage). Auxiliary resonant electrode 31c It was added to the binding with, may be provided with a stronger bond. Similarly, the first auxiliary output side coupling electrode 41b and the second auxiliary output side provided in a different layer from the layer in which the first auxiliary output side coupling electrode 41b and the second auxiliary output side coupling electrode 41d are provided. The first output provided between the electrode connected to the coupling electrode 41d through the through conductor and a layer different from the layer provided with the first output stage auxiliary resonance electrode 31b and the second output stage auxiliary resonance electrode 31d. By arranging the stage auxiliary resonant electrode 31b and the electrode connected to the second output stage auxiliary resonant electrode 31d via a through conductor so as to face each other between different layers, the first output side coupling electrode 40b (first stage) Output side coupling electrode 40d) and first auxiliary output side coupling electrode 41b (second auxiliary output side coupling electrode 41d), output stage resonance electrode 30b, and first output stage auxiliary resonance electrode 31b (second output). Stage auxiliary resonant electrode 31 ) Was added to the binding with, may be provided with a stronger bond. This further reduces the increase in insertion loss at frequencies located between the resonant frequencies of the respective resonant modes, even at very wide passband widths, and is flatter over the entire very wide passband. A band-pass filter having a lower loss pass characteristic can be obtained.

  In the example of the embodiment described above, an example in which the first input terminal electrode 60a, the second input terminal electrode 60c, and the output terminal electrode 60b are provided is shown. The first input terminal electrode 60a, the second input terminal electrode 60c, and the output terminal electrode 60b are not necessarily required.

  FIG. 7 is a block diagram showing a configuration example of a high-frequency module 80 using the bandpass filter of the present invention and a wireless communication device 85 using the same.

  The high-frequency 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 of the baseband signals and before demodulation. It has.

  The RF unit 82 includes the above-described band-pass filter 821 of the present invention. The RF signal obtained by modulating the baseband signal or the received RF signal is band-limited (a signal having a frequency other than the communication band is attenuated). And pass through a bandpass filter 821. The input side (baseband unit 81 side) of the bandpass filter 821 has a balanced circuit configuration, and the output side (antenna end side) has an unbalanced circuit configuration.

  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 an unbalanced antenna 84 to the output side of the band-pass filter 821 (the output side of the high-frequency module 80), the wireless communication device 85 of the present invention that transmits and receives RF signals is configured.

  According to such a configuration, conversion from the balanced type to the unbalanced type can be performed without providing a balun between the bandpass filter 821 and the RF IC 822, which can contribute to downsizing. Further, by using the bandpass filter 821 of the present invention in which the loss of the signal passing through the entire communication band is small, the attenuation of the transmission signal and the reception signal passing through the bandpass filter 821 is reduced. improves. Furthermore, since the amplification degree of the transmission signal and the reception signal can be reduced, power consumption in the amplifier circuit is reduced. Therefore, a high-performance high-frequency module 80 and a wireless communication device 85 with high reception sensitivity and low power consumption can be obtained.

  The configuration of the high-frequency module 80 is not limited to the above configuration. Examples of the wireless communication device 85 include a mobile phone, a wireless card, and a router, but are not particularly limited.

In the bandpass 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. Moreover, as thickness of the dielectric material layer 11, it sets to about 0.01-0.1 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, 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 form a slurry, and a ceramic green sheet is formed by a doctor blade method. Next, a through hole to be a through conductor is formed in the obtained ceramic green sheet using a punching machine or the like, and a through conductor is formed by filling a conductor paste such as Ag, Ag-Pd, Au, Cu or the like. Next, the various electrodes described above are formed on the ceramic green sheet using a printing method. Next, these are laminated, pressed using a hot press apparatus, and fired at 800 to 1050 ° C.

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 band pass filter shown in FIG. It is a top view which shows typically the upper and lower surfaces of the bandpass filter shown in FIG. 1, and one surface between each layer. (A) is the sectional view on the AA line of the bandpass filter shown in FIG. 1, (b) is the sectional view on the BB line of the bandpass filter shown in FIG. It is a typical exploded perspective view of other examples of an embodiment of a band pass filter of the present invention. FIG. 6 is a plan view schematically showing the upper and lower surfaces of the bandpass filter shown in FIG. 5 and one surface between layers. It is a block diagram which shows the structural example of the high frequency module using the band pass filter of this invention, and a radio | wireless communication apparatus using the same.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Laminated body 11: Dielectric layer 21: 1st earth electrode 22: 2nd earth electrode 23: Annular earth electrode 30a: Input stage resonance electrode 30b: Output stage resonance electrode 30c: Middle stage resonance electrode 31a: 1st Input stage auxiliary resonant electrode 31b: first output stage auxiliary resonant electrode 31e: first middle stage auxiliary resonant electrode 31c: second input stage auxiliary resonant electrode 31d: second output stage auxiliary resonant electrode 31f: second middle stage Auxiliary resonance electrode 40a: first input side coupling electrode 40b: first output side coupling electrode 40c: second input side coupling electrode 40d: second output side coupling electrode 41a: first auxiliary input side coupling electrode 41c : Second auxiliary input side coupling electrode 41b: first auxiliary output side coupling electrode 41d: second auxiliary output side coupling electrode 51a, 51b, 51c, 51d: penetrating conductors 52a, 52b, 52c, 52 : Through conductors 53a, 53b, 53c, 53d: Through conductors 60a, 60c: Input terminal electrode 60b: Output terminal electrode 71a: First signal input point 71c: Second signal input point 72b: Signal output point 73b: Signal output Point 80: High-frequency module 85: Wireless communication device

Claims (6)

A laminate in which a plurality of dielectric layers are laminated;
A first ground electrode disposed on the lower surface of the laminate and connected to a ground potential;
A second ground electrode disposed on the top surface of the laminate and connected to a ground potential;
A plurality of strip-shaped resonance electrodes functioning as a half-wave resonator including at least an input stage resonance electrode and an output stage resonance electrode, arranged in parallel between one layer of the laminate;
An annular ground electrode disposed between the one layer of the laminate and surrounding the plurality of resonant electrodes;
A first input that is electromagnetically coupled facing one end side region on one end side from the center in the length direction of the input stage resonance electrode, disposed between layers above the one layer of the laminate. A side coupling electrode, a second input side coupling electrode that is electromagnetically coupled opposite the other end side region on the other end side from the center in the length direction of the input stage resonance electrode,
A plurality of layers disposed so as to face the annular ground electrode between layers above the one layer of the multilayer body, and connected to one end and the other end of each of the plurality of resonance electrodes via a through conductor An auxiliary resonant electrode,
The first input side coupling electrode has a first signal input point in a region facing a region from one end of the input stage resonant electrode to a quarter of the total length of the input stage resonant electrode, and A second signal input point in a region facing the region from the other end of the input stage resonance electrode to the quarter of the total length of the input stage resonance electrode of the second input side coupling electrode;
And have a signal output point on one end or the other end of the output-stage resonance electrode,
Arranged between layers above the one layer of the laminate,
A first input point to which a signal is input; a first connection point connected to the first signal input point via a through conductor; and a first input point connected to the one end of the input stage resonant electrode. A first auxiliary input-side coupling electrode having a region facing the auxiliary resonance electrode of
A second input point to which a signal is input; a second connection point connected to the second signal input point via a through conductor; and a second input point connected to the other end of the input stage resonant electrode. the band-pass filter to the second auxiliary input coupling electrode having a region facing the auxiliary resonant electrode further comprises optionally wherein Rukoto of. One end side of one end side from the center in the length direction of the output stage resonance electrode disposed between the same layers as the layers where the first input side coupling electrode and the second input side coupling electrode are disposed A first output-side coupling electrode that is electromagnetically coupled to face the region, and a second output that is electromagnetically coupled to face the other end-side region on the other end side from the center in the length direction of the output stage resonance electrode. The band-pass filter according to claim 1, further comprising a side coupling electrode. Arranged between layers above the one layer of the laminate,
A region opposite to the third auxiliary resonance electrode connected to one end of the output stage resonance electrode on one end side, and from the one end of the output stage resonance electrode of the first output side coupling electrode A first auxiliary output-side coupling electrode in which the other end is connected via a through conductor in a region facing the region up to ¼ of the total length of the output stage resonance electrode;
A region opposite to the fourth auxiliary resonance electrode connected to the other end of the output stage resonance electrode on one end side, and from the other end of the output stage resonance electrode of the second output side coupling electrode A second auxiliary output side coupling electrode in which the other end is connected via a through conductor in a region facing the region up to ¼ of the total length of the output stage resonance electrode;
The band-pass filter according to claim 2 , further comprising: A laminated body in which a plurality of dielectric layers are laminated, a first ground electrode disposed on the lower surface of the laminated body and connected to the ground potential;
A second ground electrode disposed on the top surface of the laminate and connected to a ground potential;
A plurality of strip-shaped resonance electrodes functioning as a half-wave resonator including at least an input stage resonance electrode and an output stage resonance electrode, arranged in parallel between one layer of the laminate;
An annular ground electrode disposed between the one layer of the laminate and surrounding the plurality of resonant electrodes;
A first input that is electromagnetically coupled facing one end side region on one end side from the center in the length direction of the input stage resonance electrode, disposed between layers above the one layer of the laminate. A side coupling electrode, a second input side coupling electrode that is electromagnetically coupled to the other end side region on the other end side from the center in the length direction of the input stage resonance electrode, and a length of the output stage resonance electrode A first output-side coupling electrode that electromagnetically couples to one end side region on one end side from the center in the direction, and the other end side region on the other end side from the center in the length direction of the output stage resonance electrode. A second output-side coupling electrode facing and electromagnetically coupled;
A plurality of layers disposed so as to face the annular ground electrode between layers above the one layer of the multilayer body, and connected to one end and the other end of each of the plurality of resonance electrodes via a through conductor An auxiliary resonant electrode,
The first input side coupling electrode has a first signal input point in a region facing a region from one end of the input stage resonant electrode to a quarter of the total length of the input stage resonant electrode, and A second signal input point in a region facing the region from the other end of the input stage resonance electrode to the quarter of the total length of the input stage resonance electrode of the second input side coupling electrode;
Wherein and have a signal output point in a region a region opposed to the 1/4 of the total length of the output-stage resonant one such from the end output stage resonance electrode of the electrode of the first output coupling electrode,
Arranged between layers above the one layer of the laminate,
A first input point to which a signal is input; a first connection point connected to the first signal input point via a through conductor; and a first input point connected to the one end of the input stage resonant electrode. A first auxiliary input-side coupling electrode having a region facing the auxiliary resonant electrode of
A second input point to which a signal is input; a second connection point connected to the second signal input point via a through conductor; and a second input point connected to the other end of the input stage resonant electrode. the band-pass filter to the second auxiliary input coupling electrode having a region facing the auxiliary resonant electrode further comprises optionally wherein Rukoto of. High-frequency module, characterized in that it includes a band-pass filter according to any one of claims 1 to 4. Wherein an RF unit including a bandpass filter according to any one of claims 1 to 4, a baseband section connected to said RF section, that and an antenna connected to the RF unit Wireless communication equipment.

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