JP5019938B2 - 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 second ground electrode connected to the ground potential, and a strip-shaped input stage resonant electrode and an output stage which function as a half-wave resonator disposed in parallel between one layer of the laminate. A resonant electrode, and is disposed between the input stage resonant electrode and the output stage resonant electrode between one layer of the laminate, and functions as a quarter wavelength resonator, and is centered in the length direction of the input stage resonant electrode. A band-shaped first middle-stage resonance electrode that is electromagnetically coupled to one end-side region on the one-end side and the one-end-side region on the one-end side from the center in the length direction of the output-stage resonance electrode, and a quarter wavelength The length of the input stage resonant electrode that functions as a resonator A band-shaped second middle resonance electrode that is electromagnetically coupled to the other end side region on the other 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 band-shaped first input-side coupling electrode disposed so as to be electromagnetically coupled opposite to the one end side region of the input stage resonance electrode between layers different from the one layer of the laminate; A band-shaped second input-side coupling electrode arranged to oppose the other end side region of the input stage resonant electrode and electromagnetically coupled to the one end side region of the output stage resonant electrode. A strip-shaped first output-side coupling electrode arranged so as to be field-coupled, and a strip-shaped second output-side arranged so as to be electromagnetically coupled facing the other end side region of the output stage resonance electrode A band pass filter comprising a coupling electrode, wherein the first A balanced electric signal is supplied to a portion of the force-side coupling electrode facing at least one end of the input stage resonance electrode from the one end of the input stage resonance electrode to ¼ of the length direction of the input stage resonance electrode, and the second input side A balanced electric signal is supplied to a portion of the coupling electrode facing at least one end of the input stage resonance electrode from the other end of the input stage resonance electrode to 1/4 of the length direction of the input stage resonance electrode, and one end or the other of the output stage resonance electrode An unbalanced electric signal is taken out from the end.

  In the bandpass filter of the present invention, the input stage resonance electrode, the output stage resonance electrode, the first middle stage resonance electrode, and the second middle stage resonance electrode are disposed between the one layer of the multilayer body in the above configuration. An annular ground electrode is formed so as to surround the electrode, and one end of each of the first middle resonance electrode and the second middle resonance electrode is connected to the annular ground electrode. .

  The band-pass filter according to the present invention may be disposed between the different layers of the multilayer body so as to face the annular ground electrode, and connected to the one end of the input stage resonant electrode by a through conductor. A first input stage auxiliary resonance electrode and a first output stage auxiliary resonance electrode connected to the one end of the output stage resonance electrode by a through conductor, and the first intermediate stage resonance electrode of the first middle stage resonance electrode. And a third ground electrode connected to the ground potential, which is disposed so as to face the other end.

  Furthermore, the band-pass filter according to the present invention is connected to the other end of the input stage resonant electrode by a through conductor disposed between the different layers of the multilayer body so as to face the annular ground electrode in the above configuration. A second input stage auxiliary resonant electrode and a second output stage auxiliary resonant electrode connected to the other end of the output stage resonant electrode by a through conductor, and the third earth electrode is the second ground electrode. It arrange | positions so that the other end of the middle stage resonance electrode may be opposed.

  Still further, the band-pass filter of the present invention is arranged in the above-described configuration so as to face the first input stage auxiliary resonance electrode in a layer different from the one layer and the different layer of the multilayer body. The first auxiliary input side coupling electrode, the second auxiliary input side coupling electrode arranged so as to face the second input stage auxiliary resonance electrode, and the first output stage auxiliary resonance electrode. A first auxiliary output side coupling electrode arranged in this manner, and a second auxiliary output side coupling electrode arranged so as to face the second output stage auxiliary resonance electrode, wherein the balanced electric signal is The first input side coupling electrode and the second input side coupling electrode are supplied to the first auxiliary input side coupling electrode and the second auxiliary input side coupling electrode through the first auxiliary input side coupling electrode. is there.

  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 bandpass filter of the present invention, the first input-side coupling electrode is disposed so as to be electromagnetically coupled facing the one end side region of the input stage resonance electrode, and the second input-side coupling electrode is the input stage The first output-side coupling electrode is disposed so as to be opposed to the one end side region of the output stage resonance electrode and is electromagnetically coupled to be opposed to the other end side region of the resonance electrode, The second output-side coupling electrode is disposed so as to be electromagnetically coupled facing the other end side region of the output stage resonance electrode, and the input stage from at least one end of the input stage resonance electrode of the first input-side coupling electrode. A balanced electrical signal is supplied to a portion facing up to 1/4 of the length direction of the resonance electrode, and the length of the input stage resonance electrode is at least from the other end of the input stage resonance electrode of the second input side coupling electrode. Balanced type in the area facing up to 1/4 of the vertical direction Air signal is supplied, one unbalanced electrical signals from the end or the other end of the output stage resonance electrode is adapted to be taken out. With this configuration, 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 at a wide passband far exceeding the range that could be realized by a filter using a conventional quarter wavelength resonator, insertion at a frequency located between the resonance frequencies of the respective resonance modes It is possible to obtain a bandpass filter having flat and low-loss pass characteristics over the entire wide passband with no significant increase in loss.

  According to the bandpass filter of the present invention, the annular ground electrode is formed so as to surround the input stage resonant electrode, the output stage resonant electrode, the first middle stage resonant electrode, and the second middle stage resonant electrode, and the first middle stage When one end of the resonance electrode and the second middle resonance electrode is connected to the annular ground electrode, one end of each of the pair of middle resonance electrodes can be easily connected to the ground potential.

  Furthermore, according to the band-pass filter of the present invention, the first input stage auxiliary resonant electrode disposed so as to face the annular ground electrode and connected to one end of the input stage resonant electrode by a through conductor, and the output stage resonant A first output stage auxiliary resonance electrode connected by a through conductor to one end of the electrode, and connected to the ground potential disposed to face the other end of the first middle resonance electrode When the third ground electrode is provided, a capacitance is generated between the two at each facing portion. Therefore, the length of each resonance electrode can be shortened, and a small bandpass filter can be obtained. Can do.

  Furthermore, the band-pass filter according to the present invention is connected to the other end of the input stage resonant electrode by a through conductor disposed between the different layers of the multilayer body so as to face the annular ground electrode in the above configuration. A second input stage auxiliary resonant electrode and a second output stage auxiliary resonant electrode connected to the other end of the output stage resonant electrode by a through conductor, and the third earth electrode is the second ground electrode. When arranged so as to face the other end of the middle resonance electrode, the length of each resonance electrode can be shortened, and a smaller band-pass filter can be obtained.

  Furthermore, according to the bandpass filter of the present invention, the first auxiliary input-side coupling electrode disposed so as to face the first input stage auxiliary resonance electrode and the second input stage auxiliary resonance electrode are opposed to each other. A second auxiliary input-side coupling electrode arranged in such a manner, a first auxiliary output-side coupling electrode arranged so as to face the first output stage auxiliary resonance electrode, and a second output stage auxiliary resonance electrode And a second auxiliary output side coupling electrode arranged so as to face each other, and the balanced electric signal is transmitted through the first auxiliary input side coupling electrode and the second auxiliary input side coupling electrode to the first input side. When supplied to the coupling electrode and the second input side coupling electrode, 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 are connected. Similarly, the output stage auxiliary resonant electrode is added to the electromagnetic coupling of Electromagnetic field coupling between the auxiliary output coupling electrode occurs, is added to the electromagnetic coupling between the output stage resonance electrode and the output side coupling electrode. Thus, the electromagnetic field coupling between the first and second input side coupling electrodes and the input stage resonance electrode, and the electromagnetic field coupling between the first and second output side coupling electrodes and the output stage resonance electrode are achieved. Since it becomes even stronger, even with very wide passbands, the increase in insertion loss at frequencies located between the resonant frequencies of the respective resonant modes is further reduced, and is flatter across the wide passband. A band-pass filter having a lower loss pass characteristic can be obtained.

  Further, according to the high frequency 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 transmission signal and the reception 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 high-frequency module and wireless communication device with high reception sensitivity and low power consumption can be obtained.

  Hereinafter, 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 and layers of the bandpass filter shown in FIG. 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 shown in FIGS. 1 to 4 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 an upper surface of the laminated body 10. A second ground electrode 22 disposed in the band, a strip-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 multilayer body 10, and an input stage resonance An output stage resonance electrode and an output stage resonance electrode which are disposed between the electrode 30a and the output stage resonance electrode 30b and function as a quarter wavelength resonator and which are one end side from the center in the length direction of the input stage resonance electrode 30a. A band-shaped first middle-stage resonance electrode 30c that is electromagnetically coupled to one end side region on one end side from the center in the length direction of 30b, and the length of the input-stage resonance electrode 30a that functions as a quarter-wave resonator. From the center in the vertical direction A band-shaped second middle-stage resonance electrode that functions as a quarter-wave resonator by electromagnetically coupling to the other-end-side area on the other end side from the center in the length direction of the side end region and the output-stage resonance electrode 30b. 30d, a ring-shaped ground electrode 23 formed so as to surround these resonance electrodes, a band-like first input-side coupling electrode 40a and a second input disposed so as to face the input stage resonance electrode 30a. The side coupling electrode 40c is composed of a first output-side coupling electrode 40b and a second output-side coupling electrode 40d which are disposed in a manner to face the output stage resonance electrode 30b.

  The first ground electrode 21 is formed on the entire lower surface of the laminate 10, and the second ground electrode 22 is removed from the periphery of the input terminal electrode 60 a, input terminal electrode 60 c, and output terminal electrode 60 b on the upper surface of the laminate 10. The strip line resonators are arranged almost on the entire surface, both of which are connected to the ground potential, together with the input stage resonance electrode 30a, the output stage resonance electrode 30b, the first middle stage resonance electrode 30c, and the second middle stage resonance electrode 30d. It is composed.

  The input stage resonant electrode 30a and the output stage resonant electrode 30b constitute a stripline resonator together with the first ground electrode 21 and the second ground electrode 22, and function as a ½ wavelength resonator.

  Further, the first middle-stage resonance electrode 30c and the second middle-stage resonance electrode 30d each function as a quarter-wave resonator by being connected to the ground potential by connecting one end to the annular ground electrode 23. Each length is set to a length of about 2 to 6 mm, for example, when the center frequency is 4 GHz and the relative dielectric constant of the dielectric layer 11 is about 10.

  Here, the input stage resonance electrode 30a and the output stage resonance electrode 30b that function as a half-wave resonator are equivalent to two resonance electrodes that function as a quarter-wave resonator in the length direction. To do. Therefore, 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 first middle-stage resonant electrode 30c disposed therebetween are electromagnetically coupled (edge coupled) to each other. 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 second middle-stage resonant electrode 30d disposed therebetween are electromagnetically coupled (edge coupled) to each other.

  The first middle resonance electrode 30c and the second middle resonance electrode 30d are arranged such that one end thereof is connected to the ground potential (annular ground electrode 23) and the other end thereof is opposed to each other. Yes. Because of this arrangement, one end side region (for ¼ wavelength) on one end side from the center in the length direction of the input stage resonance electrode 30a and one from the center in the length direction of the output stage resonance electrode 30b. The one end side region (for ¼ wavelength) on the end side and the first middle resonance electrode 30c disposed therebetween are coupled in an interdigital manner. Similarly, the other end side region (for 1/4 wavelength) on the other end side from the center in the length direction of the input stage resonance electrode 30a and the other end on the other end side from the center in the length direction of the output stage resonance electrode 30b. The side region (for ¼ wavelength) and the second middle-stage resonant electrode 30d disposed therebetween are coupled in an interdigital manner. Therefore, a strong coupling is obtained by adding the coupling by the magnetic field and the coupling by the electric field. Here, the smaller the distance between the first and second middle resonance electrodes 30c, 30d and the input stage resonance electrode 30a or the output stage resonance electrode 30b, the stronger the coupling is obtained. Since it becomes difficult, for example, it is set to about 0.05 to 0.5 mm.

  In this way, by edge coupling to each other and interdigital coupling, the frequency interval between the resonance frequencies in each resonance mode can be realized with a filter using a conventional quarter wavelength resonator. Thus, it is possible to obtain a wide passband width of about 40% in a specific band suitable as a bandpass filter for UWB, which is far beyond the above range.

  These resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, first middle stage resonance electrode 30c, and second middle stage resonance electrode 30d) are coupled in an interdigital manner and broadside coupled to each other. This time, the coupling becomes too strong, and it has been found by examination that it is not preferable for realizing a pass bandwidth of about 40% in the specific band.

  The first input-side coupling electrode 40a and the second input-side coupling electrode 40c are electromagnetically placed between the layers above the layer where the input stage resonance electrode 30a is disposed and opposite to the input stage resonance electrode 30a. It is arranged so as to be coupled to the boundary. 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 electrically connected to the input terminal electrode 60a provided on the upper surface of the multilayer body 10 by through conductors 52a and 53a (shown by dotted lines in FIG. 2). The second input side coupling electrode 40c is electrically connected to the input terminal electrode 60c provided on the upper surface of the multilayer body 10 by through conductors 52c and 53c (shown by dotted lines in FIG. 2). In the figure, 41a and 41c are lands. Here, the connection point 71a between the first input side coupling electrode 40a and the through conductor 52a is the length of the input stage resonance electrode 30a from at least one end of the input stage resonance electrode 30a of the first input side coupling electrode 40a. In the present example, it is provided at a part facing one end of the input stage resonance electrode 30a. The connection point 71c between the second input side coupling electrode 40c and the through conductor 52c is at least from the other end of the input stage resonance electrode 30a of the second input side coupling electrode 40c in the length direction of the input stage resonance electrode 30a. Of the input stage resonance electrode 30a in the present example. 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 electric signals input from the external circuit to the input terminal electrodes 60a and 60c are supplied from the connection point 71a to the first input side coupling electrode 40a and from the connection 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 respectively opposed to the output stage resonance electrode 30b between layers above the layer where the output stage resonance electrode 30b is disposed. Are arranged to be electromagnetically coupled. 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. Therefore, the first output side coupling electrode 40b and the one end side region of the output stage resonance electrode 30b and the second output side coupling electrode 40d and the other end side region of the output stage resonance electrode 30b are broadside coupled. Therefore, it is strongly coupled as compared with the case of edge coupling.

  Further, the output stage resonance electrode 30b is connected to the output terminal electrode 60b provided on the upper surface of the multilayer body 10 by through conductors 51b, 52b, 53b (shown by dotted lines in FIG. 2), and the first output side The coupling electrode 40b and the second output side coupling electrode 40d are not connected to the through conductor 51 and are formed independently. In the figure, 41b and 72b are lands. Here, the through conductor 51b is connected to one end (connection point 73b) of the output stage resonance electrode 30b. The unbalanced electric signal output to the external circuit is taken out from one end (connection point 73b) of the output stage resonance electrode.

  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 total power of the balanced electrical signal supplied from the input terminal electrode 60a to the first input side coupling electrode 40a and the balanced electrical signal supplied from the input terminal electrode 60c to the second input side coupling electrode 40c is In this example, one of the output stage resonance electrodes 30b is used so that the power of the unbalanced electric signal taken out to the output terminal electrode 60b is equal to that of the unbalanced electric signal. A structure in which the end (connection point 73b) is connected to the output terminal electrode 60b by through conductors 51b, 52b, 53b is employed. Thus, an electrical signal having a reverse phase, that is, a balanced electrical signal input from an external circuit and electromagnetically coupled from the input stage resonance electrode 30a to the first middle resonance electrode 30c and transmitted to the output stage resonance electrode 30b, The balanced electrical signal that is electromagnetically coupled to the intermediate resonance electrode 30d of 2 and transmitted to the output resonance electrode 30b is synthesized in phase at the output resonance electrode 30b and is extracted as an unbalanced electrical signal.

  Thus, the first input side coupling electrode 40a and the second input side coupling electrode 40c and the input stage resonance electrode 30a are very strongly coupled, and the first output side coupling electrode 40b and the second output side coupling electrode are coupled. 40d and the output stage resonance electrode 30b are very strongly coupled, so that even in a wide pass band far exceeding the region that could be realized by a filter using a conventional quarter wavelength resonator, It is possible to obtain a bandpass filter having a flat and low-loss pass characteristic over a wide passband without greatly increasing the insertion loss at frequencies located between the resonance frequencies of the respective resonance modes.

  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 FIGS. 2 and 3, the length of the first input side coupling electrode 40a and the first output are connected because the through conductor 51b is connected to one end of the output stage resonance electrode 30b and the land 71b is formed. Although the length is different from the length of the side coupling electrode 40b, the length is actually substantially the same.

  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.

  The annular ground electrode 23 is the same layer as the layer where the resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, first middle stage resonance electrode 30c and second middle stage resonance electrode 30d) of the laminate 10 are provided. Are formed so as to surround these resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, first middle stage resonance electrode 30c and second middle stage resonance electrode 30d), and the first middle stage resonance electrode 30c. One end of the second middle resonance electrode 30 d is connected to the annular ground electrode 23. The annular ground electrode 23 itself has a function of connecting one end of the first middle resonance electrode 30c and the second middle resonance electrode 30d to the ground potential by being connected to the ground potential. Even in the case where a band-pass filter is formed in a partial region in the module substrate due to the presence of the annular ground electrode 23, the first middle-stage resonance arranged so that the other ends thereof face each other. One end of the electrode 30c and the second middle resonance electrode 30d can be easily connected to the ground electrode. The annular ground electrode 23 surrounds the input stage resonance electrode 30a, the output stage resonance electrode 30b, the first middle stage resonance electrode 30c, and the second middle stage resonance electrode 30d in a ring shape, so that the input stage resonance electrode 30a and the output stage resonance electrode 30d. Leakage of electromagnetic waves generated from the electrode 30b, the first middle resonance electrode 30c, and the second middle resonance electrode 30d to the surroundings can be reduced. This effect is particularly useful in preventing adverse effects on other areas of the module substrate when a bandpass filter is formed in a partial area of the module substrate.

  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 bandpass filter shown in FIG. FIG. 7 is a plan view schematically showing the upper and lower surfaces and layers of the bandpass filter shown in FIG. 8A is a cross-sectional view taken along line AA of the bandpass filter shown in FIG. 5, and FIG. 8B is a cross-sectional view taken along line BB of the bandpass filter shown in FIG.

  The band-pass filter shown in FIGS. 5 to 8 is characterized in that, in addition to the configuration of the band-pass filter shown in FIGS. 1 to 4, first, an auxiliary resonance electrode is provided.

  Specifically, between the layers above the layers where the resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, first middle stage resonance electrode 30c, and second middle stage resonance electrode 30d) of laminate 10 are provided. The first 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, 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 third ground electrode 31e are provided.

  The first input stage auxiliary resonance electrode 31 a and the second input stage auxiliary resonance electrode 31 c are disposed so as to face the annular ground electrode 23. In other words, it has a region facing the annular ground electrode 23. 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. It is connected to the.

  The first output stage auxiliary resonance electrode 31 b and the second input stage auxiliary resonance electrode 31 d are arranged so as to face the annular ground electrode 23. In other words, it has a region facing the annular ground electrode 23. The first output stage auxiliary resonant electrode 31b is connected to one end of the output stage resonant electrode 30b by a through conductor 51b, and the second output stage auxiliary resonant electrode 31d is connected to the other end of the output stage resonant electrode 30b by the through conductor 51d. It is connected to the.

  The third ground electrode 31e has a region facing the side closer to the other end of each of the first middle resonance electrode 30c and the second middle resonance electrode 30d. That is, they are arranged so as to face the other end of the first middle resonance electrode 30c and the other end of the second middle resonance electrode 30d. In addition, when it arrange | positions so that it may be equally electromagnetically coupled to the other end of the 1st middle stage resonance electrode 30c, and the other end of the 2nd middle stage resonance electrode 30d, the 3rd earth electrode 31e is what is called a null point. It is located and is at ground potential. Therefore, at this time, even if the third ground electrode 31e is not connected (grounded) to the ground potential, the other end of each of the first middle resonance electrode 30c and the second middle resonance electrode 30d is connected to the third ground electrode. By facing the electrode 31e, 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 output stage auxiliary resonance electrode 31d are annularly grounded. The same effect as facing the electrode 23 can be obtained. In the case where the third ground electrode 31e is not disposed at the null point, that is, the electromagnetic field is evenly distributed between the other end of the first middle resonance electrode 30c and the other end of the second middle resonance electrode 30d. If not arranged to be coupled, it must be connected (grounded) to ground potential.

  According to this structure, a capacitance is generated between the annular ground electrode 23 and the third ground electrode 31e in a region facing the third ground electrode 31e. Thus, the length of the resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, first middle stage resonance electrode 30c, and second middle stage resonance electrode 30d) can be shortened. Thus, 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, and the second output stage auxiliary resonance electrode 31d facing 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. Moreover, although the one where the space | interval of an opposing part is small can produce a big electrostatic capacitance, it becomes difficult on manufacture, Therefore For example, it sets to about 0.01-0.5 mm.

  In this example, the first input stage auxiliary resonant electrode 31a, the second input stage auxiliary resonant electrode 31c, the first output stage auxiliary resonant electrode 31b, and the second output stage auxiliary resonant electrode 31d are respectively connected to the annular ground electrode 23. The first input stage auxiliary resonance electrode 31a is disposed at one end of the input stage resonance electrode 30a, the second input stage auxiliary resonance electrode 31c and the output stage resonance electrode 30b are disposed at the other end of the input stage resonance electrode 30a. The first output stage auxiliary resonance electrode 31b is connected to one end of the first output stage, and the second output stage auxiliary resonance electrode 31d is connected to the other end of the output stage resonance electrode 30b through the through conductors 51a, 51c, 51b, 51d, respectively. Is a combination of the first input stage auxiliary resonance electrode 31a, the first output stage auxiliary resonance electrode 31b, and the third ground electrode 31e arranged so as to face only the other end of the first middle stage resonance electrode 30c. It may be Align. In this case, since the third ground electrode 31e is off the null point, it is necessary to be connected to the ground potential via the through conductor.

  Further, the bandpass filter of the present example is characterized by including 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 arranged to face the first input stage auxiliary resonant electrode 31a, in other words, has a region facing the first input stage auxiliary resonant electrode 31a. A balanced electric signal is supplied to the first input side coupling electrode 40a (connection point 71a) via the first auxiliary input side coupling electrode 41a. The first auxiliary input side coupling electrode 41a is connected to the input terminal electrode 60a via the through conductor 53a at a portion facing the first input stage auxiliary resonance electrode 31a, and is input from an external circuit. A balanced electric signal is supplied to the first input side coupling electrode 40a via the first auxiliary input side coupling electrode 41a.

  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 disposed so as to face the second input stage auxiliary resonant electrode 31c, in other words, has a region facing the second input stage auxiliary resonant electrode 31a. The balanced electric signal is supplied to the second input side coupling electrode 40c (connection point 71c) via the second auxiliary input side coupling electrode 41c. Note that the second auxiliary input side coupling electrode 41c is connected to the input terminal electrode 60c via the through conductor 53c at a portion facing the second input stage auxiliary resonance electrode 31c, and is input from an external circuit. A balanced electric signal is supplied to the second input side coupling electrode 40c via the second auxiliary input side coupling electrode 41c.

  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 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. Yes. As a result, the first auxiliary output side coupling electrode 41b connected to the first output side coupling electrode 40b and the first output stage auxiliary resonance electrode 31b connected to the output stage resonance electrode 30b are broadside coupled. Since this coupling is added to the coupling between the first output-side coupling electrode 40b and the output stage resonance electrode 30b, the coupling is stronger as a whole. Further, the one end side region of the output stage resonance electrode 30b and the joined body of the first output stage auxiliary resonance electrode 31b connected thereto, the first output side coupling electrode 40b and the first auxiliary connected to the first output stage auxiliary resonance electrode 31b. Since the joined body of the output side coupling electrode 41b 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 output side coupling electrode 41b, it is stronger than the case where it is connected to the output terminal electrode 60b on the same side as the side connected to the first output side coupling electrode 40b. Bonding can be realized.

  The second auxiliary output side coupling electrode 41d is disposed so as to face the second output stage auxiliary resonant electrode 31d, in other words, has a region facing the second output stage auxiliary resonant electrode 31d. Yes. As a result, the second auxiliary output side coupling electrode 41d connected to the second output side coupling electrode 40d and the second output stage auxiliary resonance electrode 31d connected to the output stage resonance electrode 30d are broadside coupled. Since this coupling is added to the coupling between the second output side coupling electrode 40d and the output stage resonance electrode 30d, the coupling is stronger as a whole. Furthermore, the other end side region of the output stage resonance electrode 30b and the joined body of the second output stage auxiliary resonance electrode 31d connected thereto, the second output side coupling electrode 40d, and the second auxiliary connected to this. Since the joined body of the output side coupling electrode 41d 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 output side coupling electrode 41d, it is stronger than the case where it is connected to the output terminal electrode 60d on the same side as the side connected to the second output side coupling electrode 40d. Bonding can be realized.

  An unbalanced electric signal is taken out 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 51e, the through conductor 53b, and the output terminal electrode 60b. It has become.

  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.

  Thus, according to the band-pass filter of this example, a very wide passband of 40% in a ratio band far exceeding the range that could be realized by a filter using a conventional quarter wavelength resonator. It is possible to obtain a high-performance band-pass filter that can be suitably used as a UWB filter and has a flat and low-loss pass characteristic over the entire area.

  Although not shown, the first layer is provided between the layers above the layers where the resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, first middle stage resonance electrode 30c, and second middle stage resonance electrode 30d) are provided. After providing the input stage auxiliary resonance electrode 31a, the first output stage auxiliary resonance electrode 31b, the second input stage auxiliary resonance electrode 31c, the second output stage auxiliary resonance electrode 31d, and the third ground electrode 31e, The input stage auxiliary resonant electrode and the input stage auxiliary resonant electrode are also provided in layers below the layers where the resonant electrodes (input stage resonant electrode 30a, output stage resonant electrode 30b, first middle stage resonant electrode 30c and second middle stage resonant electrode 30d) are provided. An output stage auxiliary resonance electrode may be provided. At this time, the auxiliary resonance electrode between the upper layer and the auxiliary resonance electrode between the lower layer may be connected to the first middle resonance electrode 30c and the second middle resonance electrode 30d, respectively, through the through conductor. Thus, when the capacitance is increased, the resonance electrodes (input stage resonance electrode 30a, output stage resonance electrode 30b, first middle stage resonance electrode 30c, and second middle stage resonance electrode 30d) can be further shortened. When the capacitance is not increased, the area of the auxiliary resonance 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 above-described embodiment, an example in which the input terminal electrodes 60a and 60c and the output terminal electrodes 60b and 60d are provided is shown. However, a band-pass filter is formed in one region in the module substrate. The input terminal electrodes 60a and 60c and the output terminal electrodes 60b and 60d are not necessarily required.

  FIG. 9 is a block diagram showing a configuration example of a high-frequency module 80 using the band-pass 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 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.

  Next, specific examples of the electronic component of the present invention will be described.

Electrical characteristics of the bandpass filter having the structure shown in FIGS. 5 to 8 were calculated by simulation using a finite element method. The calculation conditions are as follows: the relative dielectric constant of the dielectric layer 11 is 9.4, the dielectric loss tangent of the dielectric layer 11 is 0.0005, and the electrical conductivity of various electrodes is 3.0 × 10 ⁷ S / m. did. As for the shape dimensions, the input stage resonance electrode 30a and the output stage resonance electrode 30b have a width of 0.4 mm and a length of 5.8 mm, and the middle stage resonance electrodes 30c and 30d have a width of 0.4 mm and a length of 2.9 mm. The distance between the resonant electrodes was 0.13 mm. The first and second input side coupling electrodes 40a, 40c, the first and second output side coupling electrodes 40b, 40d have a width of 0.3 mm and a length of 2.5 mm, and the auxiliary input side coupling electrodes 41a, 41c and auxiliary The output side coupling electrodes 41b and 41d have a width of 0.3 mm and a length of 1.45 mm. The auxiliary resonance electrodes 31a, 31b, 31c, and 31d have a width of 0.45 mm and a length of 0.35 mm from the end portions of the input stage resonance electrode 30a, the output stage resonance electrode 30b, and the middle stage resonance electrodes 30c and 30d. A rectangular shape having a width of 0.2 mm and a length of 0.4 mm toward the input stage resonance electrode 30a, the output stage resonance electrode 30b, and the middle stage resonance electrodes 30c and 30d was joined to the 0.8 mm rectangle. The third ground electrode was a rectangle having a width of 0.4 mm and a length of 0.8 mm. The input terminal electrode 60a and the output terminal electrode 60b were square with sides of 0.3 mm, and the distance from the second ground electrode 22 was 0.2 mm. The outer shape of the first earth electrode 21, the second earth electrode 22, and the annular earth electrode 23 was 3 mm wide and 8 mm long, and the opening of the annular earth electrode 23 was 2.4 mm wide and 6 mm long. The entire bandpass filter has a width of 3 mm, a length of 8 mm, and a thickness of 0.91 mm, and the layer where the input stage resonance electrode 30a, the output stage resonance electrode 30b, and the middle stage resonance electrodes 30c and 30d are provided at the center in the thickness direction is located I tried to do it. The distance between the layers was 0.065 mm. The thicknesses of the various electrodes were 0.01 mm, and the diameters of the various through conductors were 0.1 mm.

  FIG. 10 is a graph showing the simulation results, where the horizontal axis represents frequency and the vertical axis represents loss, and shows the transmission characteristic (S21) and the reflection characteristic (S11). According to the graph shown in FIG. 10, in the pass characteristic (S21), it is much wider than the region realized by the filter using the conventional quarter wavelength resonator, which corresponds to 40% in the specific band. The loss is less than 1.5 dB in the frequency range of 2 GHz to 4.7 GHz. In this way, excellent pass characteristics that are flat and have low loss over the entire wide passband were obtained, and the effectiveness of the present invention was confirmed.

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 and interlayer of a band pass filter shown in FIG. (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 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 bandpass filter shown in FIG. 5. It is a top view which shows typically the upper and lower surfaces and interlayer of a band pass filter shown in FIG. (A) is the sectional view on the AA line of the bandpass filter shown in FIG. 5, (b) is the sectional view on the BB line of the bandpass filter shown in FIG. 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. 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 earth electrode 22: Second earth electrode 23: Annular earth electrode 30a: Input stage resonance electrode 30b: Output stage resonance electrode 30c: First middle stage resonance electrode 30d: Second middle-stage resonant electrode 31a: first input stage auxiliary resonant electrode 31b: first output stage auxiliary resonant electrode 31c: second input stage auxiliary resonant electrode 31d: second output stage auxiliary resonant electrode 31e: third Ground 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: through conductors 52a, 52b, 52c, 52d: Passing conductors 53a, 53b, 53c, 53d: through conductors 60a, 60c: input terminal electrode 60b: Output terminal electrodes 71a, 71b, 71c, 71d, 72b, 73b: connection point 80: high-frequency module 85: a wireless communication device

Claims (7)

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 band-shaped input stage resonance electrode and output stage resonance electrode functioning as a half-wave resonator, arranged in parallel between one layer of the laminate,
It is arranged between the input stage resonant electrode and the output stage resonant electrode between one layer of the laminate, and functions as a quarter wavelength resonator and is one end side from the center in the length direction of the input stage resonant electrode Function as a band-shaped first middle-stage resonance electrode and a quarter-wave resonator that are electromagnetically coupled to one end-side region of the output stage and the one-end side region on the one end side from the center in the length direction of the output stage resonance electrode. A band-like shape 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 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 middle resonant electrode of
A band-shaped first input-side coupling electrode disposed so as to be electromagnetically coupled opposite to the one end side region of the input stage resonance electrode between layers different from the one layer of the laminate; A band-shaped second input-side coupling electrode arranged to oppose the other end side region of the input stage resonant electrode and electromagnetically coupled to the one end side region of the output stage resonant electrode. A strip-shaped first output-side coupling electrode arranged so as to be field-coupled, and a strip-shaped second output-side arranged so as to be electromagnetically coupled facing the other end side region of the output stage resonance electrode A bandpass filter comprising a coupling electrode,
A balanced electrical signal is supplied to a portion of the first input-side coupling electrode facing at least one end of the input stage resonant electrode from the one end of the input stage resonant electrode to ¼ of the length direction of the input stage resonant electrode, and the first A balanced electric signal is supplied to a portion of the two input-side coupling electrodes facing at least one-fourth of the length direction of the input stage resonant electrode from the other end of the input stage resonant electrode;
A band-pass filter, wherein an unbalanced electric signal is taken out from one end or the other end of the output stage resonance electrode. An annular ground electrode is formed between the one layer of the multilayer body so as to surround the input stage resonance electrode, the output stage resonance electrode, the first middle stage resonance electrode, and the second middle stage resonance electrode, 2. The band-pass filter according to claim 1, wherein one end of each of the first middle resonance electrode and the second middle resonance electrode is connected to the annular ground electrode. Between the different layers of the laminate,
A first input stage auxiliary resonant electrode disposed to face the annular ground electrode and connected to the one end of the input stage resonant electrode by a through conductor; and a through conductor at the one end of the output stage resonant electrode And a first output stage auxiliary resonant electrode connected by
The band-pass filter according to claim 2, further comprising a third earth electrode connected to the earth potential and disposed to face the other end of the first middle-stage resonance electrode. Between the different layers of the laminate,
A second input stage auxiliary resonant electrode arranged to face the annular ground electrode and connected to the other end of the input stage resonant electrode by a through conductor; and a through conductor at the other end of the output stage resonant electrode A second output stage auxiliary resonant electrode connected by
4. The band-pass filter according to claim 3, wherein the third ground electrode is disposed so as to face the other end of the second middle resonance electrode. Between the one layer of the laminate and the different layer from the different layer,
A first auxiliary input-side coupling electrode arranged to face the first input stage auxiliary resonant electrode; and a second auxiliary input side arranged to face the second input stage auxiliary resonant electrode A coupling electrode, a first auxiliary output-side coupling electrode arranged to face the first output stage auxiliary resonance electrode, and a second arranged to face the second output stage auxiliary resonance electrode Auxiliary output side coupling electrode,
The balanced electrical signal is supplied to the first input side coupling electrode and the second input side coupling electrode via the first auxiliary input side coupling electrode and the second auxiliary input side coupling electrode. The band-pass filter according to claim 4. A high-frequency module comprising the bandpass filter according to any one of claims 1 to 5. An RF unit including the bandpass filter according to any one of claims 1 to 5, a baseband unit connected to the RF unit, and an antenna connected to the RF unit. Wireless communication equipment.

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