WO2002005376A1 - Circuit filtrant et circuit de communication a haute frequence utilisant ce filtre - Google Patents
Circuit filtrant et circuit de communication a haute frequence utilisant ce filtre Download PDFInfo
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- WO2002005376A1 WO2002005376A1 PCT/JP2001/005286 JP0105286W WO0205376A1 WO 2002005376 A1 WO2002005376 A1 WO 2002005376A1 JP 0105286 W JP0105286 W JP 0105286W WO 0205376 A1 WO0205376 A1 WO 0205376A1
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- filter
- line
- filter circuit
- lines
- frequency
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20381—Special shape resonators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/2013—Coplanar line filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
- H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
Definitions
- the present invention relates to a filter circuit and a high-frequency communication circuit device using the same, and more particularly, to a filter circuit for selectively passing a predetermined frequency component of a signal input to an input terminal to an output terminal, and using the filter circuit.
- the present invention relates to a high-frequency communication circuit device.
- Filter circuits are often made by connecting individual components such as coils and capacitors at low frequencies. However, in high-frequency bands such as microwave and millimeter-wave bands, they are generally made with distributed constant type circuits.
- FIG. 18 is a perspective view showing a configuration of an edge-coupled filter which is a typical distributed constant filter.
- This filter is provided on the most common microstrip line as a distributed constant line.
- this filter includes a substrate 150 formed of an insulator such as alumina ceramic.
- a duland layer 15 1 is formed on the entire back surface of the substrate 150.
- Lines 152 and 153 are part of the microstrip line, which is a high-frequency transmission line, and constitute the input and output terminals of the filter, respectively.
- the lines 154 and 155 constitute a so-called; I 2 open-circuit resonator.
- the wavelength is the wavelength of the electric signal propagating through the line at a frequency near the center frequency of the filter circuit.
- microstrip lines 15 2, 15 3 and the / open line resonators 15 4, 15 5 are usually printed on the surface of the insulator substrate 150 by means of photolithography or other means. And putter jung with high accuracy. Therefore, a planar circuit filter having a structure as shown in FIG. 18 is generally known as a low-cost, highly productive filter circuit.
- FIG. 19A is an equivalent circuit that uses a large number of distributed constant lines so as to easily correspond one-to-one with the structure of FIG.
- FIG. 19A is somewhat inconvenient when performing a simulation later.
- an LC parallel resonance circuit 154 including a coil 154a and a capacitor 154b, one end of which is grounded, and an LC parallel resonance circuit 155 including a coil 155a and a capacitor 155b, which are grounded once
- IZ 2 open-line resonators 154 and 155 respectively, in FIG.
- Each of the coils 154a, 155a has a predetermined inductance L1
- each of the capacitors 154b, 155b has a predetermined capacitance C1.
- the center of the ⁇ / 2 open-line resonator is equivalently grounded, and the impedance at the open ends at both ends is almost infinite.
- Capacitors 156 and 157 having capacitance C2 in FIGS. 19A and 19B correspond to electromagnetic field coupling parts 156 and 157 in FIG.
- the electromagnetic field coupling parts 156 and 157 the microstrip lines 1 52 and 1 53 and the ⁇ / 2 open line resonators 154 and 1 It is arranged.
- capacitive coupling is mainly used. It is known that the following electromagnetic field coupling occurs.
- a capacitor 158 having a capacitance C3 in FIGS. 19A and 19B corresponds to the electron field coupling section 158 in FIG.
- the electromagnetic field coupling unit 158 the open ends of the lines 154 and 155 are arranged close to each other. In such a case, it is known that electromagnetic field coupling mainly by capacitive coupling occurs.
- FIGS. 2OA and 2OB are frequency characteristic diagrams of the filter.
- the passband is consistently designed herein as 58-61 GHz.
- C 1 0.36 61 pF
- C 2 0.0527 pF
- C 3 0.02884 pF
- L 1 0.0 1699 nH.
- the horizontal axis is the frequency [GHz]
- the vertical axis is the dB display of the absolute value of the S parameter.
- FIG. 20A and 2OB S21 representing the passage characteristic and S11 representing the reflection characteristic are plotted simultaneously.
- FIG. 20A shows the characteristics in a wide band
- FIG. 20B shows the characteristics near the pass band.
- the filter having the structure of FIG. 18 functions as a non-pass filter.
- FIGS. 18 to 2 OB the structure is shown first, then its equivalent circuit is shown, and finally the calculation results of the filter characteristics of the equivalent circuit are shown. Proceed with the explanation. However, in the second embodiment of the present invention, the effectiveness of the present invention is demonstrated by showing the measurement results of an actually prototyped filter, not just the calculation results.
- this filter is composed of an insulator substrate 161, made of alumina ceramic, etc., microstrip lines 162, 163 and ⁇ / 1 open line resonators 164, 1 formed on the surface thereof. Including 6 5 Portions 1671 to 170 surrounded by a dotted line are portions where the lines 162-165 approach each other to cause electromagnetic coupling.
- MTT-S Digest When looking at the above document (MTT-S Digest), care must be taken in the following two points.
- the power characterized by low loss achieved by micro-machine technology is not essential on the operating principle of the filter, and the operating principle itself is the same as that of the filter in Fig. 21. It is.
- FIGS. 22A and 22B are circuit diagrams showing equivalent circuits of the filter of FIG. Figure 22A is an equivalent circuit that makes extensive use of distributed constant lines, and Figure 22B is an equivalent circuit that is expressed only by lumped parameters.
- the LC parallel resonance circuit 16 5 including 5 b corresponds to the Z 2 open line resonators 16 4 and 16 5 in FIG. 21, respectively.
- Each of the coils 1664a, 165a has a predetermined inductance L1
- each of the capacitors 164b, 165b has a predetermined capacitance C1.
- Capacitors 168 and 169 having capacitances C 2 of FIGS. 22A and 22 B are respectively shown in FIG.
- Capacitor 167 corresponding to electromagnetic field coupling sections 168 and 169 and having capacitance C3 in FIGS. 22A and 22B corresponds to electromagnetic field coupling section 167 in FIG. Figure 2
- the mutual inductive coupling coefficient K of 2A and 22B corresponds to the electromagnetic field coupling section 170 in FIG.
- the central portions of the two open-line resonators 164 and 165 that is, the portions having the maximum current, are arranged so as to be substantially parallel to each other.
- electromagnetic field coupling mainly based on mutual induction magnetic field coupling occurs.
- FIG. 3B is a diagram showing the frequency characteristics of the filter.
- C 1 0.3546 pF
- C 2 0.05981 F
- C 3 0.00008 pF
- L 1 0.018 nH
- K 0.0914.
- Attenuation poles are formed at frequencies above and below the passband, and the steepness of the filter increases near these attenuation poles.
- S21 in Fig. 2 OA is less than 30 dB
- S21 in Fig. 23A is less than 150 dB.
- S21 in Figure 20A is -17 dB, whereas Figure 21 is less than 50 dB. That is, for example, in the case of a wireless communication device in which the center frequency is located at 48 GHz with respect to the center frequency of 6 OGHz, the filter characteristics of Figs. 23A and 23B are better than those of Figs. 2OA and 2OB. This is advantageous because more attenuation can be obtained than filter characteristics.
- the filters of the equivalent circuits in Figs. 22A and 22B have a generally well-known J1I path configuration and are described in many documents. For example, it is described in Chapter 2 of the well-known textbook on high-frequency filter technology, “Design and Application of Communication Filter Circuits” (by Yoshihiro Konishi, Sogo Denshi Publishing).
- the conventional filter has a problem that the steepness of the filter is still insufficient, especially when used in a radio communication device in an ultra-high frequency band such as a millimeter wave band.
- the filters of Figs. 19A and 19B it can be easily confirmed by performing a general circuit simulation, but the steepness of the graphs of Figs. 23A and 23B is almost the limit. Close to. Specific numbers vary depending on detailed conditions such as the fractional bandwidth and attenuation.For example, in the case of the filter characteristics shown in Figs.
- the attenuation pole frequency can be expressed as normalized by the center frequency.
- the frequency can only be set to 15% or more away. If you attempt to force the attenuation pole closer than this, the waveform of the filter characteristics will be distorted and distorted.
- a filter For example, if you try to use a filter to attenuate a local signal, if the local frequency is located at 48 GHz with respect to a center frequency of 60 GHz, it has the characteristics shown in Figs. 23A and 23B. Conventional filters are sufficient. However, in the actual many millimeter-wave band wireless communication device with respect to the center frequency 6 0 GH Z, frequency close to the mouth one local frequency has, for example, located 5 7 GH z or 5 8 GH z Often do. In that case, the steepness of the conventional filter is insufficient, and the attenuation cannot be ensured.
- the steepness of the filter changes depending on detailed conditions such as the relative bandwidth and attenuation.
- the frequency of the attenuation pole can be expressed as normalized by the center frequency.
- the effect of the filter steepness can be better understood by discussing it with a slightly broadband filter. Therefore, the filters shown in the graph in this specification are all standardized with a relative bandwidth of just over 5%.
- the present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a filter circuit having a high filter characteristic.
- the impedance between each input / output terminal and the line of the reference potential is maximized at each resonance frequency, and each input / output terminal is capacitively coupled to at least one other input / output terminal.
- a first capacitive coupling for capacitively coupling the input / output terminals of the two resonators and the first and second terminals to each other.
- the frequency of the attenuation pole can be made closer to the center frequency without deteriorating the waveform of the filter characteristic, and the steepness of the filter characteristic can be increased.
- a second capacitive coupling means for capacitively coupling the input terminal and the output terminal to each other is provided. In this case, the number of attenuation poles can be increased, and the attenuation in the stop band can be increased.
- the filter circuit is constituted by a line pattern composed of a conductor formed on an insulator substrate, each of the plurality of resonators includes a first line having a predetermined line length, At least one end of both ends is capacitively coupled to one end of the other first line, and the first capacitive coupling means includes one end of each of the two resonators. And the other end of each of the two first lines includes third and fourth lines connected to the first and second terminals, respectively. And a fifth line and a sixth line respectively connected between the first and second terminals and the input terminal and the output terminal, at least a part of each of which is arranged in parallel close to each other.
- the filter circuit can be realized by a flat printed circuit, and the cost and size of the circuit can be reduced.
- each input / output unit terminal and the line of the reference potential is maximized at each resonance frequency, and each input / output terminal has at least one other input / output terminal.
- An electromagnetic field coupling means for connecting the input terminal and the output terminal to each other and for magnetically coupling the input terminal and the output terminal to each other, and a second capacitive coupling for capacitively coupling the input terminal and the output terminal to each other. Means are provided.
- each of the plurality of resonators includes a first line having a predetermined line length, and at least one end of both ends of each first line is one end of another first line.
- the first capacitive coupling means is capacitively coupled to the other end of each of the two first lines included in the two resonators.
- the eighth track is
- the frequency of the attenuation pole can be made closer to the center frequency without deteriorating the waveform of the filter characteristic, and the steepness of the filter characteristic can be increased.
- the filter circuit can be realized by a flat printed circuit, and the cost and size of the circuit can be reduced.
- the fifth and sixth lines are close to each other at a quarter wavelength of a signal having the center frequency of the filter circuit from the open ends of the third and fourth lines.
- the current value is maximized in the fifth and sixth lines, the mutual induction magnetic field coupling between the fifth and sixth lines can be efficiently generated in a narrow space.
- each of the plurality of resonators is a quarter-wavelength short-circuited line resonator or a half-wavelength open-line resonator.
- the resonator can be realized by a flat printed circuit, and the cost and size of the circuit can be reduced.
- the filter circuit according to the present invention can be used as a part of a multiplexer type filter circuit. In this case, increase the performance and cost of the multiplexer circuit And miniaturization can be achieved.
- the filter circuit is used as a high-frequency circuit for removing a low-level signal or an image signal. In this case, it is possible to improve the performance, reduce the cost, and reduce the size of the high-frequency communication circuit device.
- FIG. 1 is a plan view showing a configuration of a distributed constant filter according to Embodiment 1 of the present invention.
- FIGS. 2 and 2B are circuit diagrams showing equivalent circuits of the filter shown in FIG. 3A and 38 are diagrams showing filter characteristics of the equivalent circuits shown in FIGS. 2 and 2B.
- FIG. 4 is a plan view showing a configuration of a distributed constant filter according to Embodiment 2 of the present invention.
- FIGS. 5A and 5B are circuit diagrams showing equivalent circuits of the filter shown in FIG. 6A and 6 are diagrams showing the filter characteristics of the equivalent circuits shown in FIGS. 5 and 5B.
- FIG. 7A and 7B are diagrams showing the filter characteristics of a prototype of the filter shown in FIG.
- FIG. 8 is a plan view showing a configuration of a distributed constant filter according to Embodiment 3 of the present invention.
- FIGS. 9A and 9B are circuit diagrams showing equivalent circuits of the filter shown in FIG.
- FIGS. 1OA to 1OC are diagrams showing a configuration of a distributed constant filter according to Embodiment 4 of the present invention.
- FIG. 11A and 11B are diagrams showing a configuration of a filter according to Embodiment 5 of the present invention.
- FIG. 12 is a circuit diagram showing a configuration of the transformer shown in FIGS. 11A and 11B.
- FIG. 13 is a block diagram showing a configuration of a millimeter wave transmitting device included in a high frequency radio communication device according to Embodiment 6 of the present invention.
- FIGS. 14A and 14B are block diagrams showing the configurations of the millimeter wave receiving device and the electronic equipment included in the high-frequency wireless communication device described in FIG.
- FIG. 15 is a block diagram showing a configuration of the frequency arrangement unit shown in FIG.
- FIG. 16 is a block diagram showing the configuration of the frequency reverse arrangement section shown in FIGS. 14A and 14B.
- FIGS. 17A to 17D are diagrams for explaining the operation of the high-frequency communication device shown in FIGS. 13 to 16.
- FIG. 18 is a perspective view showing a configuration of a conventional distributed constant filter.
- FIGS. 19A and 19B are circuit diagrams showing equivalent circuits of the filter shown in FIG.
- FIGS. 20A and 20B are diagrams showing the filter characteristics of the equivalent circuit shown in FIGS. 19A and 19B.
- FIG. 21 is a plan view showing the configuration of another conventional distributed constant filter.
- FIGS. 22A and 22B are circuit diagrams showing equivalent circuits of the filter shown in FIG.
- FIGS. 23A and 23B are diagrams showing the filter characteristics of the equivalent circuit shown in FIGS. 22A and 22B.
- FIG. 1 is a diagram showing a configuration of a distributed constant filter according to Embodiment 1 of the present invention.
- this distributed constant filter includes an insulator substrate 1 formed of an insulator such as alumina ceramic, and a line pattern formed on the insulator substrate 1.
- a ground layer that is, a grounded electrode is formed on the entire back surface of the insulator substrate 1.
- the track pattern includes tracks 2-9.
- Lines 2 and 3 are arranged on a straight line at a predetermined interval.
- Lines 2 and 3 are part of the microstrip line, and constitute the input and output terminals of the filter, respectively.
- An electric signal of a wavelength is transmitted to the microstrip line.
- Lines 4 and 5 are arranged close to and parallel to each other, and one end of each is connected to the end of lines 2 and 3, respectively. Lines 4 and 5 are arranged orthogonally to lines 2 and 3, respectively. Is placed.
- the lines 4 and 5 form an electromagnetic field coupling unit 10.
- Lines 6 and 7 are both formed in an L-shape, and one end of each is connected to the other end of lines 4 and 5, respectively.
- One side of the lines 6 and 7 is arranged in parallel with the lines 2 and 3, respectively, and the other side of each is arranged in a direction orthogonal to the lines 2 and 3, respectively.
- the distance from the open ends of the lines 6 and 7 to the electromagnetic field coupling part 10 is set to be: IZ4.
- the lines 8 and 9 are both formed in a U-shape, and each side is disposed in parallel with the other side of the lines 6 and 7 at a distance of about ⁇ / 4 or less, and each other side is: They are arranged in parallel at a lower distance.
- the other side of the line 6 and one side of the line 8 form an electromagnetic field coupling part 11
- the other side of the line 7 and one side of the line 9 form an electromagnetic field coupling part 12
- the electromagnetic field coupling unit 13 is configured.
- Each of the lines 8 and 9 constitutes a ⁇ / 2 open line resonator.
- Figures 2 2 and 2 ⁇ are circuit diagrams showing the equivalent circuit of the filter.
- Figure 2 2 is a circuit diagram that makes extensive use of distributed constant lines
- Figure 2B is a circuit diagram that uses only lumped constants.
- the LZ2 open-line resonator constituted by the line 8 is equivalent to an LC parallel resonance circuit including the coil 8a and the capacitor 8b.
- the coil 8a has a predetermined inductance L1, and one electrode thereof is grounded.
- Capacitor 8b has a predetermined capacitance C1, and one electrode thereof is grounded. This is because, at the resonance frequency, the center of the line 8 is equivalently grounded, and the impedance at the end becomes infinite.
- the pen 2 open-circuit resonator constituted by the line 9 is equivalent to an LC parallel resonance circuit including the coil 9 a and the capacitor 9 b.
- the coil 9a has a predetermined inductance L1, and one electrode of the coil 9a is grounded.
- the capacitor 9b has a predetermined capacitance C1, and one electrode is grounded.
- the electromagnetic field coupling unit 11 is equivalent to a capacitor having a predetermined capacitance C2. This is because the open ends of the lines 6 and 8 are placed close to each other with a distance of about 1/4 or less; in such a case, electromagnetic coupling mainly due to capacitive coupling occurs. It is.
- the electromagnetic field coupling unit 12 is equivalent to a capacitor having a predetermined capacitance C2.
- the electromagnetic field coupling unit 13 is equivalent to a capacitor having a predetermined capacitance C3.
- the lines 4 and 5 have a predetermined inductance L2, and are equivalent to two coils coupled to each other with a mutual induction coefficient K.
- one electrode of the coil 8a and the capacitor 8b of the LC parallel resonance circuit 8 is grounded, and the other electrode of the coil 8a and the capacitor 8 is connected via the capacitor 11 and the coil 4.
- One electrode of the coil 9 a and the capacitor 9 b of the LC parallel resonance circuit 9 is grounded, and the other electrode of the coil 9 a and the capacitor 9 b is connected to the output terminal 3 via the capacitor 12 and the coil 5.
- the other electrodes of the coil 8 a and the capacitor 8 b are connected to the other electrodes of the coil 9 a and the capacitor 9 b via the capacitor 13.
- Coils 4 and 5 are mutually induced magnetically coupled.
- 3A and 3B are diagrams showing frequency characteristics of the equivalent circuits shown in FIGS. 2A and 2B.
- C 1 0.8201 pF
- C 2 0.0054 545 pF
- C 3 0.006 153 pF
- L 1 0.0000786 ⁇ H
- L 2 1.257 nH
- K 0.0319
- the center frequency was set to 60 GHz.
- this filter differs from the filter in Fig. 1 in that lines 2 and 3 are replaced with lines 14 and 15, respectively.
- Lines 14 and 15 are part of the microstrip line, and constitute the input terminal and output terminal of the filter, respectively.
- the tracks 14, 15 are arranged in a straight line.
- the end of the line 14 and the end of the line 15 are arranged close to each other by a distance of about ⁇ / 4 or less, and constitute an electromagnetic field coupling unit 16.
- FIGS. 5A and 5B are circuit diagrams showing equivalent circuits of the filter shown in FIG. Figure 5 5 is a circuit diagram that makes extensive use of distributed constant lines
- Figure 5B is a circuit diagram that uses only lumped constants.
- the electromagnetic field coupling unit 16 is equivalent to a capacitor having a predetermined capacitance C4. This is because the open ends of the lines 14 and 15 are arranged close to each other with a distance of about ⁇ / 4 or less, and such coupling is caused by electromagnetic field coupling mainly based on capacitive coupling. is there. Therefore, in this equivalent circuit, the capacitor 16 is connected between the input terminal 14 and the output terminal 15.
- the other configuration is the same as that of the filter shown in FIGS. 1 and 2, and the description thereof will not be repeated.
- FIGs 7A and 7B show the results of actual trial production and measurement of a filter with the structure shown in Fig. 4.
- This prototype finoleta was used as an RF filter in a wireless communication circuit with a pass band of 58 to 61 GHz and a local frequency of 57 GHz, and was designed specifically to suppress the image frequency. So, indeed, two attenuation poles at frequencies above and below the passband It is designed with emphasis on the attenuation pole on the low frequency side.
- FIG. 7A shows the filter characteristics over a wide band
- FIG. 7B is an enlarged view of the filter characteristics near the pass band.
- a total of four attenuation poles are formed at frequencies just above and below the passband, thereby greatly increasing the steepness, especially on the low frequency side.
- the measurement results show that the passband insertion loss is between --4.0 and --2.6 dB, the passband return loss is at least 17 dB, and the image frequency is between 53 and 56 GHz.
- the band attenuation is at least 20.0 dB, and practical performance has been obtained.
- This prototype filter was formed by patterning mainly with a copper material on an alumina ceramic substrate having a thickness of 0.15 mm.
- a so-called line and space is 50 ⁇ .
- the line width of the microstrip line other than the filter is 150 ⁇ , and the line width of all lines, including the open-circuit resonators 8 and 9, is 50 ⁇ for the filter. I made it.
- each of the 1/2 open-line resonators 8 and 9 is about 7 10 / im.
- the total distance from the microstrip line with a line width of 150 im to the open ends of lines 6 and 7 is about 650 ⁇ .
- the gap distance between the feeder lines 6 and 7 and the L / 2 open line resonators 8 and 9 is 50 m, and the gap distance between the two; 1/2 open line resonators 8 and 9 is 90 / xm.
- the specific dimensions shown here can be easily changed if, for example, the substrate thickness, the dielectric constant ⁇ of the substrate material, and the line and space design rules for fine patterning change. Not something.
- a millimeter-wave compatible network analyzer and wafer probe were used for the measurement. These meters were calibrated using the LRM calibration board and the LRM calibration program manufactured by the company. The wafer probe was fixed to the wafer probe station, and the measurement was performed with care not to change the contact state such as displacement during the measurement.
- the number of ⁇ / 2 open-line resonators is not limited to two.
- a broadband filter it is necessary to increase the number of poles of the resonance in the passband, and thus to increase the number of 1/2 open line resonators, The present invention is applicable even in such a case.
- -FIG. 8 is a diagram showing a configuration of a distributed constant filter according to Embodiment 3 of the present invention. Referring to FIG. 8, this filter differs from the filter of FIG. 1 in that lines 8 and 9 are replaced by lines 21 to 23.
- Lines 2 1 and 2 2 are both formed in an L-shape, and one side of each line is
- the other sides are arranged in parallel with the lines 2 and 3, respectively.
- One end of each of the lines 21 and 22 is arranged in parallel with the other end of each of the lines 6 and 7 at a distance of about / 4 or less.
- the line 23 is formed in a U-shape, and is arranged between the lines 21 and 22. One end of the line 23 is disposed in parallel with one end of the line 21 at a distance of about ⁇ / 4 or less. The other side end of the line 23 is disposed in parallel with the one side end of the line 22 at a distance of about 4 or less.
- One end of the line 21 and the other end of the line 6 constitute an electromagnetic field coupling unit 24.
- One end of the line 22 and the other end of the line 7 constitute an electromagnetic field coupling part 25.
- One end of the line 23 and the other end of the line 21 constitute an electromagnetic field coupling unit 26.
- the other end of the line 23 and the other end of the line 22 constitute an electromagnetic field coupling part 27.
- Each of the lines 21 to 23 constitutes a ⁇ 2 open line resonator.
- the ⁇ 2 open-line resonator is not necessarily U-shaped.
- the open ends of the ⁇ / 2 open-line resonator need not all be involved in electromagnetic field coupling, and may be isolated without causing electromagnetic field coupling.
- FIGS. 9A and 9B are circuit diagrams showing equivalent circuits of the filter shown in FIG. 8.
- FIG. 9B is a circuit diagram using a large number of distributed constant lines
- FIG. 9B is a circuit diagram using only lumped constants.
- the 1/2 open-line resonator constituted by the line 21 is equivalent to the LC parallel resonance circuit including the coil 21a and the capacitor 21b.
- the ⁇ / 2 open line resonator constituted by the line 22 is equivalent to an LC parallel resonator including a coil 22 a and a capacitor 22 b.
- Consisting of a line 23; a 1/2 open-line resonator is equivalent to an LC parallel resonant circuit including a coil 23a and a capacitor 23b.
- the coils 21a to 23a have predetermined inductances L5 to L7, respectively. Each one of the electrodes is grounded. Each of the capacitors 21b to 23b has a predetermined capacitance C5 to C7, and one of the electrodes is grounded.
- the electromagnetic field coupling portions 24 to 27 are equivalent to capacitors having predetermined capacitances C2, C2, C3, and C3, respectively.
- one electrode of the coil 21a and the capacitor 21b of the LC parallel resonance circuit 21 is grounded, and the other electrode of the coil 21a and the capacitor 21b is connected to the capacitor 24. And connected to input terminal 2 via coil 4.
- One electrode of coil 22 a and capacitor 22 b of LC resonance circuit 22 is grounded, and the other electrode of coil 22 a and capacitor 22 b is connected to output terminal 3 via capacitor 25 and coil 5 Is done.
- the capacitor 23 of the LC parallel resonance circuit 23 and one electrode of the capacitor 23 b are grounded, and the other electrode of the coil 23 a and the capacitor 23 b is connected to the capacitor 24 and the LC in parallel via the capacitor 26.
- it is connected via capacitor 27 to a node between capacitor 25 and LC parallel resonance circuit 22.
- Coils 4 and 5 are mutually induced magnetically coupled.
- FIGS. 10A to 10C are diagrams showing a configuration of a filter according to Embodiment 4 of the present invention.
- This filter includes an insulator substrate 30 and line patterns formed on both surfaces thereof.
- 10A is an overall perspective view
- FIG. 10B is a diagram showing a pattern on the front surface of the substrate
- FIG. 10 OC is a diagram showing a pattern on the rear surface of the substrate.
- This filter is not a filter provided on a microstrip line but a filter provided on a coplanar line.
- a line 31 corresponding to lines 2, 4, and 6 in FIGS. 2A and 2B, an L-shaped line 32, and lines 31 and 32 are arranged on the surface of the substrate 30.
- a ground layer 33 is formed so as to surround it.
- the tip of the line 31 and one end of the line 32 are arranged close to and parallel to each other.
- the other end of the line 32 is connected to the ground layer 33.
- a line 34 corresponding to lines 3, 5, and 7 of FIGS. 2A and 2B, an L-shaped line 35, and a ground layer formed so as to surround the lines 34 and 35 are formed on the back surface of the substrate 30. 36 are provided.
- the front end of the line 34 and one end of the line 35 are arranged close to and parallel to each other.
- the other end of the line 35 is connected to the ground layer 36.
- FIG. 1 OA portions of the lines 31 and 34 corresponding to the lines 4 and 5 in FIG. 1 are arranged one above the other to form an electromagnetic field coupling part 37.
- the ends of the lines 31 and 34 and one ends of the lines 32 and 35 form electromagnetic coupling parts 38 and 39, respectively.
- One end of the line 32 and one end of the line 35 constitute an electromagnetic field coupling unit 40.
- Each of the lines 38 and 39 constitutes a four-short-line resonator.
- the equivalent circuit of this filter is the same as the equivalent circuit in Figs.
- the ⁇ ⁇ 4 short line resonators 32 and 35 constitute LC parallel resonance circuits 8 and 9, respectively.
- the electromagnetic field coupling sections 38, 39, and 40 form capacitors 11, 12, and 13, respectively.
- the electromagnetic field coupling part 37 constitutes the coils 4 and 5 which are coupled by mutual induction magnetic field.
- FIGS. 11A and 11B are diagrams showing a configuration of a filter according to the fifth embodiment of the present invention.
- This filter is an implementation of the circuit diagram of FIG. 2 in a form suitable for the quasi-microwave band.
- FIG. 11B is a perspective view of the filter, and
- FIG. 11B is a plan view of the filter as viewed from above.
- this filter includes an insulating substrate 41 and a plurality of individual components.
- a ground electrode 42 is formed on the entire back surface of the substrate 41, and electrodes 43 to 49 are formed on the surface of the substrate 41.
- the electrode 43 is connected to the ground electrode 42 via a plurality of via holes 50.
- the LC parallel resonance circuits 8 and 9 in Figs. 2A and 2B are realized by so-called dielectric resonators 51 and 52.
- the dielectric resonators 51 and 52 are This is a well-known technique that is already widely used in the coke band, and has a coaxial structure in which an insulator such as alumina ceramic is sandwiched between an outer conductor and a center conductor.
- the lengths of the dielectric resonators 51 and 52 are designed to be ⁇ / 4 with respect to the wavelength ⁇ near the center frequency of the filter, and one end 51 a and 51 b of each is an outer conductor.
- the central conductor are short-circuited and connected to the electrode 43, and the other ends 51b and 52b are open ends.
- the center conductors of the resonators 51, 52 and the electrodes 44, 45 on the substrate 41 are connected by lead pins 51c, 52c, respectively. I have.
- Capacitors 11 to 13 in FIGS. 2A and 2B are realized by chip capacitors 53 to 55 in the fifth embodiment, respectively.
- the chip capacitors 53 to 55 are connected between the electrodes 44 and 46, 45 and 47, and 44 and 45, respectively.
- the electromagnetic field coupling section 10 in FIGS. 2A and 2B is realized by a separate transformer 56 in this filter.
- the transformer 56 includes terminals 56c to 56f, a coil 56a connected between the terminals 56c and 56d, and terminals 56e and 56f. And a coil 56b connected between them. Coils 56a and 56b are mutually inductively magnetically coupled. Terminals 56c to 56f are connected to electrodes 48, 46, 49, and 47, respectively. Electrodes 48 and 49 constitute input terminal 2 and output terminal 3.
- the present invention is not limited to the distributed constant circuit in the millimeter wave band, but can be realized by a circuit using individual components and having a modest frequency.
- the present invention can be easily applied not only to one two-terminal filter circuit but also to a three-terminal duplexer filter circuit or a three-terminal or more multiplexer filter circuit.
- millimeter waves in the 60 GHz band are used as indoor radio transmission waves.
- Millimeter waves in the 60 GHz band are significantly higher in frequency than current satellite TV broadcast waves, and the wireless bandwidth of the transceiver can be widened, so terrestrial broadcasting and satellite broadcasting can be transmitted together at once.
- this frequency band absorption by oxygen and moisture is large, so shielding between adjacent houses is easy.
- a half wavelength is 2.5 mm in the air, which is about the same as the chip size of the IC, and can be integrated with the IC including the antenna.
- FIGS. 13 and 14A and 14B are block diagrams showing a configuration of a high-frequency wireless communication apparatus according to Embodiment 6 of the present invention.
- this high-frequency wireless communication device includes a millimeter-wave transmitter 60, a millimeter-wave receiver 76, and an electronic device 89.
- Millimeter-wave transmitter 60 includes VHF / UHF antenna 61, BS antenna 62, CS antenna 63, connector 64, connector 65, broadcast wave input section 66, frequency array section 67, up-converter 68, band-pass filter (BPF) 68 a, including a transmission section 69, a power supply section 70, a power supply section 71, a reception section 72, a power control section 73, a used device storage section 74, and a millimeter wave transmission antenna 75.
- BPF band-pass filter
- the millimeter wave receiving device 76 includes a millimeter wave receiving antenna 77, an amplifying unit 78, a bandpass filter 78a, a down converter 79, a frequency reverse arrangement unit 80, a mixing / switching unit 81, a power control unit 82, a power receiving unit 83, A control signal receiving unit 84, a transmitting unit 85, an antenna terminal 86, an antenna terminal 87, and a connector 88 are provided.
- the electronic device 89 includes an antenna terminal 90, a broadcast signal receiving unit 91, a control signal transmitting unit 92, a power supply unit 93, and a memory unit 94.
- the electronic device 89 is a TV receiver, for example, although not shown in FIGS. 14A and 14B, a display unit and the like are provided in addition to the above configuration contents.
- Radio waves from terrestrial broadcasting and satellite broadcasting are input to connectors 64 and 65 via a VHF / UHF antenna 61, a BS antenna 62 and a CS antenna 63.
- the number of the connectors 64 and 65 is two in this example, the number is not limited to this, and may be any number according to the connection status.
- the antenna is connected here, the antenna may be connected to a collective broadcast wave supply terminal from a joint receiving system such as CA TV.
- the broadcast wave input from the connectors 64 and 65 is supplied to the broadcast wave input unit 66.
- the transmission wave input section 66 is usually set to an appropriate gain according to the frequency band and modulation method.
- the amplified broadcast wave is supplied to the frequency arrangement section 67.
- frequency array section 67 includes amplifiers 111, 112, filters 113, 114, frequency mixer 115, and local oscillator 116.
- the amplifier 111 amplifies BS and CS broadcast signals.
- the filter 113 removes unnecessary frequency components from the output signal of the amplifier 111.
- the amplifier 112 amplifies the terrestrial broadcast signal.
- Frequency mixer 115 and local oscillator 116 convert the frequency of the output signal of amplifier 112.
- the filter 114 removes unnecessary frequency components from the frequency-converted signal.
- the intermediate frequency of CS and BS in the signal input to frequency array section 67 is determined by a block converter (not shown) provided between connector 65 and CS antenna 63, as shown in FIG. As shown in the figure, they are arranged on the frequency axis with an intermediate frequency of 1035 MHz to l 895 MHz.
- the frequency arranging section 67 only such terrestrial broadcast signals are frequency-converted by the frequency mixer 115 and the local oscillator 116 in such a manner as shown in FIG. 17B. Arrange on the high frequency side. This is because the frequency of terrestrial broadcasting is low, so the signal upconverted to the 60 GHz band comes close to the local oscillation wave, but this local oscillation wave is originally removed without being radiated from the antenna.
- the ground broadcast wave is temporarily other frequency bands in the intermediate frequency stages (e.g. 2 GH z band) to be frequency _ number conversion by the frequency sequence unit 67.
- the broadcast waves arranged on the frequency axis in this manner are up-converted to the 60 GHz band by the up-converter 68 in the millimeter-wave transmitting device 60, and unnecessary waves are removed by the band-pass filter 68a.
- Such a radio frequency is obtained, the power is amplified by the transmission section 69, and the signal is output from the millimeter wave transmission antenna 75 of the millimeter wave transmission device 60 as a millimeter wave radio signal.
- the millimeter-wave wireless signal received by the millimeter-wave receiving antenna 77 of the millimeter-wave receiving device 76 is amplified by the amplifier 78, and the image signal is removed by the band-pass filter 78a. After being removed, it is down-converted by the down-converter 79 and input to the frequency reverse arrangement unit 80.
- the band-pass filters 68 a and 78 a are composed of the finoleta described in the first to fifth embodiments.
- the frequency reverse arrangement section 80 includes amplifiers 121, 122, filters 123, 124, frequency mixers 125, and local oscillators 126.
- the amplifier 122 amplifies the reproduced BS and CS broadcast signals.
- the filter 123 removes unnecessary frequency components from the output signal of the amplifier 122.
- the amplifier 124 amplifies the reproduced terrestrial broadcast signal.
- the bi-noreta 124 removes unnecessary frequency components from the output signal of the amplifier 122.
- the frequency mixer 125 and the local oscillator 126 convert the frequency of the signal passing through the filter 124.
- the frequency reverse array section 80 is arranged on the frequency axis by the frequency mixer 125 and the local oscillator 126 in a process opposite to that of the frequency array section 67. It has the function of frequency conversion from the inter-frequency to the original terrestrial frequency.
- the broadcast wave obtained in this way is input to the electronic device 89, and when the electronic device 89 is a TV receiver, TV reception becomes possible.
- the above is the basic configuration for collectively transmitting the broadcast wave to the electronic device 89 such as a TV receiver via the millimeter wave transmitting device 60 and the millimeter wave receiving device 76 and performing the millimeter wave transmission.
- the electronic device 89 such as a TV receiver via the millimeter wave transmitting device 60 and the millimeter wave receiving device 76 and performing the millimeter wave transmission.
- a configuration for controlling the millimeter wave receiving device 76 and the millimeter wave transmitting device 60 from the electronic device 89 will be described.
- antenna terminals are provided by the broadcast signal receiver 91.
- the broadcast wave supplied from 90 is selected and received.
- the antenna terminal 90 is directly connected to the VHF F UHF antenna 61, the BS antenna 62, and the CS antenna 63
- a millimeter wave receiver 76 connects the antenna terminal 90 to the connector 88.
- the millimeter-wave receiver 76 is provided with a mixing / switching section 81 and antenna terminals 86 and 87. Even when the millimeter-wave receiver 76 is attached to the electronic equipment 89, the antenna 86 , 8 7 to VH F and UH F antenna 61, BS antenna 62 and CS antenna 63, and use the broadcast wave from here via mixing / switching unit 81 It is also possible to do. When using the millimeter-wave receiver 76, it is not usually necessary to connect the antenna terminals 86 and 87, but the transmission from the millimeter-wave transmitter 60 is limited to VHF, UHF and BS broadcasts, for example.
- the millimeter-wave receiver 76 When the CS broadcast is to be wired with a coaxial cable in a separate system, or when the operation of the millimeter-wave transmitter 60 or the millimeter-wave receiver 76 is to be stopped, the millimeter-wave receiver 76 is used as an electronic device.
- the antenna for VHF / UHF 61, the antenna 62 for BS, the antenna 63 for CS, etc. can be connected without changing the state of attachment. .
- the user when the user selects a channel desired to be received by the broadcast signal receiving unit 91, the user determines in advance that the receiving channel is a VHF / UHF antenna 61, a BS antenna 62, a CS
- the power input directly from the antenna 63 or the input via the millimeter-wave transmitter 60 and the millimeter-wave receiver 76 is stored in the memory unit 94 in association with the reception channel. deep. If the selected receiving channel is a channel using the millimeter wave transmitting device 60 and the millimeter wave receiving device 76 based on the information stored in the memory portion 94, the antenna terminal is provided by the power supply portion 93.
- the power required for the operation of the millimeter wave receiving device 76 is supplied via 95. The power supply is performed while being superimposed on the broadcast wave.
- the power is supplied by the power supply unit 93, and the control signal from the control signal transmitting unit 92 is superimposed to control the power of the power control unit 82. It may be performed accordingly.
- the power and the control signal that have passed through the connector 88 are separated from the broadcast wave by the power receiving unit 83 and the control signal receiving unit 84, and supplied to the power control unit 82.
- supplying power from the power supply unit 93 when the electronic device 89 needs a receiving operation is suitable for reducing power consumption.
- the power supply control unit 82 controls the power supply to the amplification unit 78, the down converter 79, and the frequency re-arrangement unit 80. Good.
- the control signal transmitter 92 uses vertical polarization according to the receiving channel to the CS antenna 63, in addition to controlling the power supply. Information that specifies whether to use flat polarization can be transmitted. In the case of receiving a BS broadcast, information on whether to supply power to the BS antenna 62 is transmitted.
- Information such as whether the signal is vertically polarized, horizontally polarized, or BS received is generated by the control signal receiver 92, transmitted via the antenna terminal 90 and the connector 88, and separated by the control signal receiver 84. Is done.
- the separated information is transmitted by the transmission unit 85 to the millimeter wave transmission device 60.
- the signal transmission from the transmitting unit 85 to the receiving unit 72 is performed using infrared rays, but the transmission is not limited to infrared rays, and wireless, wired, voice, power line carrier, or the like may be used.
- UHF band radio waves unlike infrared communication, it can penetrate shielding such as sliding doors and walls, so millimeter-wave transmitters and millimeter-wave receivers can be used between partitioned rooms. be able to.
- a cordless telephone such as a PHS, not only signals for horizontal and vertical polarization control, but also data transmission are possible, and there is an advantage that two-way communication becomes possible.
- the amplifying unit 78, the downconverter 79, and the frequency reverse array unit 80 in the millimeter wave receiving device 76 are used.
- the operation of the broadcast wave input unit 66, frequency array unit 67, upconverter 68, and transmission unit 69 of the millimeter wave transmitter 60 is unnecessary. It is necessary to control power supply to various circuit blocks.
- the electronic equipment 89 may be a large stationary It is assumed that a TV receiver and a movable liquid crystal TV receiver each have a millimeter wave receiver 76 attached thereto. Therefore, in this case, each of the electronic device 89 as a large stationary TV receiver and the electronic device 89 as a movable liquid crystal TV receiver is controlled by the control signal transmitting section 92 to identify the device and the device. Transmits information indicating that reception is currently required, for example, information indicating that it is on, to the millimeter wave receiving device 76 connected to each. The transmitted information is separated by the control signal receiving unit 84 and transmitted by the transmitting unit 85. It is transmitted to the two millimeter wave transmitters 60.
- the millimeter wave transmitting device 60 this information is received by the receiving unit 72 and transmitted to the used device storage unit 74.
- the used device storage unit 74 stores devices that use the broadcast wave of the millimeter wave transmitting device 60 by the user in advance, and the device identification information from the stored device group and the current reception of the device. Information indicating that it is necessary is obtained from the receiving unit 72, and all of the devices stored in the device storage unit 74 are turned off, etc., so that the broadcast wave is not required.
- the power supply control section 73 cuts off the power supply to the broadcast wave input section 66, the frequency arrangement section 67, the up-converter 68, the transmission section 69, etc., and the power supply sections 70, 71 Turn off the power to the CS antenna 63 and the BS antenna 62. In this way, power consumption can be reduced when the millimeter wave transmitting device 60 and the millimeter wave receiving device 76 are unnecessary.
- a filter having excellent steepness can be realized by a low-cost flat printed circuit.
- the steepness is not high because it is simply a narrow band filter. For example, the steepness can be increased while securing a specific bandwidth of 5% or more.
- the filter of the present invention is used as an RF filter to remove a local signal or an image signal, so that the entire device can be reduced in size, simplified, and reduced in cost. There are merits that can be done.
- the filter circuit of the present invention is highly effective especially when used in a millimeter-wave band broadband wireless system.
- it is very effective to employ the filter circuit of the present invention. .
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/312,836 US6876276B2 (en) | 2000-07-07 | 2001-06-20 | Filter circuit and high frequency communication circuit using the same |
EP01943796A EP1317014A4 (en) | 2000-07-07 | 2001-06-20 | FILTER CIRCUIT AND HIGH FREQUENCY COMMUNICATION CIRCUIT WITH THIS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-206319 | 2000-07-07 | ||
JP2000206319A JP3577262B2 (ja) | 2000-07-07 | 2000-07-07 | フィルタ回路およびそれを用いた高周波通信回路装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002005376A1 true WO2002005376A1 (fr) | 2002-01-17 |
Family
ID=18703260
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/005286 WO2002005376A1 (fr) | 2000-07-07 | 2001-06-20 | Circuit filtrant et circuit de communication a haute frequence utilisant ce filtre |
Country Status (4)
Country | Link |
---|---|
US (1) | US6876276B2 (ja) |
EP (1) | EP1317014A4 (ja) |
JP (1) | JP3577262B2 (ja) |
WO (1) | WO2002005376A1 (ja) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003038992A1 (fr) * | 2001-11-01 | 2003-05-08 | Sharp Kabushiki Kaisha | Melangeur d'harmoniques d'ordre pair a filtre integre et appareil de communication radio haute frequence l'utilisant |
JP4226390B2 (ja) | 2003-05-15 | 2009-02-18 | シャープ株式会社 | マルチバンドフィルタ回路および高周波通信装置 |
JP2005117433A (ja) | 2003-10-08 | 2005-04-28 | Eudyna Devices Inc | フィルタ |
CN101361219B (zh) | 2006-09-28 | 2012-05-30 | 株式会社村田制作所 | 电介质滤波器、芯片元件及芯片元件制造方法 |
US20080181185A1 (en) * | 2007-01-30 | 2008-07-31 | Broadcom Corporation | Dynamic multi-patch based frequency division multiple access frequency assignment |
US20090197641A1 (en) * | 2008-02-06 | 2009-08-06 | Broadcom Corporation | Computing device with handheld and extended computing units |
US8253029B2 (en) | 2007-04-12 | 2012-08-28 | Nec Corporation | Filter circuit element and electronic circuit device |
TWI352447B (en) * | 2008-01-04 | 2011-11-11 | Hon Hai Prec Ind Co Ltd | Ultra wide-band filter |
US8975520B2 (en) * | 2008-07-27 | 2015-03-10 | Steren Electronics International, Llc | Ground loop isolator for a coaxial cable |
TWI437758B (zh) * | 2008-09-24 | 2014-05-11 | Wistron Neweb Corp | 濾波裝置及其相關無線通訊接收機 |
JP2011091682A (ja) * | 2009-10-23 | 2011-05-06 | Murata Mfg Co Ltd | 無線信号受信装置 |
US9094054B2 (en) * | 2009-11-30 | 2015-07-28 | Broadcom Corporation | IC controlled wireless power operation and applications thereof including control channel communication configuration |
JP6317890B2 (ja) * | 2013-05-17 | 2018-04-25 | 太陽誘電株式会社 | 高周波フィルタ及びこれを備える高周波モジュール |
US9853685B2 (en) * | 2013-07-11 | 2017-12-26 | Qorvo Us, Inc. | Tunable duplexer arrangement configured for TDD operation |
EP3547439B1 (en) * | 2018-03-29 | 2023-06-21 | Intel Corporation | A band pass filter, a diplexer and method for forming a band pass filter |
CN112310583B (zh) * | 2020-10-15 | 2022-03-25 | 上海海事大学 | 基于t型双模谐振器的三通带滤波器 |
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JPH0758506A (ja) * | 1993-08-09 | 1995-03-03 | Oki Electric Ind Co Ltd | Lc型誘電体フィルタ、およびこれを用いた空中線共用器 |
JPH0832309A (ja) * | 1994-07-15 | 1996-02-02 | Toko Inc | 誘電体フィルタとその特性調整方法 |
JPH11205005A (ja) * | 1998-01-14 | 1999-07-30 | Matsushita Electric Ind Co Ltd | 平面型フィルタ及び平面型フィルタモジュール |
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JPH0458721A (ja) | 1990-06-26 | 1992-02-25 | Toshiba Corp | 電動機制御装置 |
JP2606044B2 (ja) * | 1991-04-24 | 1997-04-30 | 松下電器産業株式会社 | 誘電体フィルタ |
JP2539115B2 (ja) | 1991-08-21 | 1996-10-02 | 日本無線株式会社 | 誘電体フィルタ― |
US5412358A (en) * | 1992-02-28 | 1995-05-02 | Ngk Insulators, Ltd. | Layered stripline filter |
DE69426283T2 (de) * | 1993-08-24 | 2001-03-15 | Matsushita Electric Ind Co Ltd | Geschichtete Antennenweiche und dielektrisches Filter |
JPH0793535A (ja) | 1993-09-22 | 1995-04-07 | Fanuc Ltd | 画像修正処理方法 |
JPH0878907A (ja) | 1994-08-31 | 1996-03-22 | Kyocera Corp | 積層型誘電体フィルタ |
JPH08181506A (ja) * | 1994-12-22 | 1996-07-12 | Sumitomo Special Metals Co Ltd | 誘電体フィルター |
JP2000013106A (ja) | 1998-06-18 | 2000-01-14 | Murata Mfg Co Ltd | 誘電体フィルタ、送受共用器および通信装置 |
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2000
- 2000-07-07 JP JP2000206319A patent/JP3577262B2/ja not_active Expired - Fee Related
-
2001
- 2001-06-20 US US10/312,836 patent/US6876276B2/en not_active Expired - Fee Related
- 2001-06-20 WO PCT/JP2001/005286 patent/WO2002005376A1/ja active Application Filing
- 2001-06-20 EP EP01943796A patent/EP1317014A4/en not_active Withdrawn
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JPH0758506A (ja) * | 1993-08-09 | 1995-03-03 | Oki Electric Ind Co Ltd | Lc型誘電体フィルタ、およびこれを用いた空中線共用器 |
JPH0832309A (ja) * | 1994-07-15 | 1996-02-02 | Toko Inc | 誘電体フィルタとその特性調整方法 |
JPH11205005A (ja) * | 1998-01-14 | 1999-07-30 | Matsushita Electric Ind Co Ltd | 平面型フィルタ及び平面型フィルタモジュール |
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Also Published As
Publication number | Publication date |
---|---|
JP3577262B2 (ja) | 2004-10-13 |
US6876276B2 (en) | 2005-04-05 |
EP1317014A4 (en) | 2005-10-12 |
EP1317014A1 (en) | 2003-06-04 |
JP2002026605A (ja) | 2002-01-25 |
US20030102941A1 (en) | 2003-06-05 |
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