JP2009296306A - Wiring substrate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently attenuate an inputted high-frequency signal in a spurious area, and to make harmonics attenuate significantly, in particular. <P>SOLUTION: This wiring substrate includes: main lines 4 and 5 which connect an input line 3 and an output line 6, are thinner than the line width of the input line 3 and have a line length of 1/4 wavelength of a prescribed frequency included in a high-frequency signal; four first open stubs 8, 9, 12 and 13, which are wider than the line width of the input line 3 and have a line length of 1/12 wavelength of the prescribed frequency, wherein one end parts are respectively connected to a connection part A between the main line 4 and the input line 3, and a connection part C between the main line 5 and the output line 6 by two each so as to face each other; and two second open stubs 10 and 11, which are wider than the width of the input line 3 and have a line length of 1/8 wavelength of the prescribed frequency, wherein one end parts are connected to a center position of the main line 4 so as to face each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wiring board including a filter that is used in a radar transmitter and the like and attenuates a high-frequency signal input from a high-frequency signal circuit.

  In general, an electronic device such as a mobile phone that transmits and receives radio waves often uses a filter that attenuates an unnecessary frequency band (spurious region) in order to obtain a signal in a desired frequency band.

  For example, Patent Document 1 discloses that four high-impedance transmission lines with a narrow pattern width formed by microstrip lines on the surface of a dielectric substrate, and three low-width patterns with a wide pattern width connected alternately thereto. A low-pass filter composed of an impedance transmission line has been proposed.

  On the other hand, a radar transmitter or the like outputs a signal wave amplified to a high output level by a microwave power amplifier. Therefore, the output signal wave includes harmonics that are second and third harmonics of the fundamental wave. Especially many are included. For this reason, it has been necessary to significantly attenuate such harmonics.

  Therefore, Patent Document 1 proposes a low-pass filter in which two open stubs each having an electrical length of a quarter wavelength of a predetermined blocking frequency are connected to each of the high impedance transmission lines.

Further, Patent Document 2 is a microwave filter having a passband frequency higher than a stopband frequency, and a strip path having an input terminal and an output terminal, and the strip path are sequentially provided in parallel at equal intervals. Microwave filters constituting first, second, and third stubs having different lengths have been proposed.
JP 2004-282573 A Japanese Examined Patent Publication No. 63-10601

  However, the low-pass filter described in Patent Document 1 has a configuration in which two open stubs are provided separately from the low-impedance transmission line in order to attenuate harmonics having a large noise level. There was a case.

  In addition, the microwave filter described in Patent Document 2 cannot obtain a uniform attenuation amount in a spurious region higher than a desired frequency from an input high-frequency signal.

  The present invention has been made to solve the above-described problems, and can obtain a sufficient amount of attenuation in the spurious region without increasing the size of the device, and can obtain a particularly large amount of attenuation with respect to harmonics. An object of the present invention is to provide a wiring board provided with a filter capable of achieving the above.

  In order to achieve the above object, a first feature of a wiring board according to the present invention is a distributed constant circuit that attenuates a desired frequency region from a high-frequency signal input through an input line and outputs the signal through an output line. A wiring board including a configured filter, wherein the filter connects the input line and the output line, is narrower than a line width of the input line, and has a predetermined frequency included in the high-frequency signal. One end of the main line having a line length of / 4 wavelength, the connecting part between the main line and the input line, and the connecting part between the main line and the output line so as to face each other 4 first open stubs, each of which is thicker than the line width of the input line and having a line length of 1/12 wavelength of the predetermined frequency, are opposed to the center position of the main line. One side End is connected respectively, thicker than the width of the input line, and in that and a two second open stub having a line length of 1/8 wavelength of the predetermined frequency.

  In order to achieve the above object, a second feature of the wiring board according to the present invention is a distributed constant circuit that attenuates a desired frequency region from a high-frequency signal input through an input line and outputs the signal through an output line. A wiring board having a configured filter, wherein the filter connects the input line and the output line, is narrower than a line width of the input line, and has a predetermined frequency of 3 included in the high-frequency signal. There are two main lines having a line length of / 8 wavelength, a first connection part that connects the main line and the input line, and a second connection part that connects the main line and the output line. Four first open stubs each having one end connected to be opposed to each other and having a line length of 1/12 wavelength of the predetermined frequency, which is thicker than the line width of the input line, On the main track One end of each of the first connection part and the second connection part is connected to each other at a position separated from each other by 1/8 wavelength of the predetermined frequency so as to face each other. And four second open stubs that are thicker than the input line and have a line length of 1/8 wavelength of the predetermined frequency.

  In order to achieve the above object, a third feature of the wiring board according to the present invention is a distributed constant circuit that attenuates a desired frequency region from a high-frequency signal input through an input line and outputs the signal through an output line. A wiring board including a configured filter, wherein the filter connects the input line and the output line, is narrower than a line width of the input line, and has a predetermined frequency included in the high-frequency signal. Two main lines having a line length of / 2 wavelengths, a first connection part that connects the main line and the input line, and a second connection part that connects the main line and the output line Four first open stubs each having one end connected to be opposed to each other and having a line length of 1/12 wavelength of the predetermined frequency, which is thicker than the line width of the input line, Center position of main track And one end on the main line so as to be opposed to each other at a position spaced apart by 1/8 wavelength of the predetermined frequency inward from the first connection portion and the second connection portion, respectively. And six second open stubs, each of which is thicker than the width of the input line and having a line length of 1/8 wavelength of the predetermined frequency.

  In order to achieve the above object, a fourth feature of the wiring board according to the present invention is a distributed constant circuit that attenuates a desired frequency region from a high-frequency signal input through an input line and outputs the signal through an output line. A wiring board including a configured filter, wherein the filter connects the input line and the output line, is narrower than a line width of the input line, and has a predetermined frequency included in the high-frequency signal. A main line having a line length of / 2 wavelengths, a first connection part for connecting the main line and the input line, a second connection part for connecting the main line and the output line, and the main line One end of each of the first and second connecting portions on the road is connected to the inside by a distance of 1/8 wavelength of the predetermined frequency so as to face each other. Said input Eight first open stubs that are thicker than the line width of the road and have a line length of 1/12 wavelength of the predetermined frequency, and one end portion so as to face each other at the center position of the main line And two second open stubs connected to each other and having a line length of 1/8 wavelength of the predetermined frequency and wider than the width of the input line.

  According to the present invention, an input high frequency signal can be sufficiently attenuated in a spurious region and a harmonic can be particularly greatly attenuated without increasing the size of the apparatus.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In the first embodiment of the present invention, the spurious region of the high-frequency signal input from the high-frequency circuit via the input line is attenuated, and particularly for the second harmonic and the third harmonic of the input high-frequency signal. A wiring board provided with a filter that greatly attenuates will be described.

<< Configuration of wiring board >>
FIG. 1 is a configuration diagram showing a configuration of a wiring board that is Embodiment 1 of the present invention.

  The wiring board 100 according to the first embodiment of the present invention is connected to the input terminal 2 to which a high frequency signal is input from the outside of the wiring board 100, the input line 3 connected to the input terminal 2, and the input line 3. A filter 1 that is a distributed constant circuit to which a high-frequency signal is input from the input line 3, an output line 6 that is connected to the filter 1 and propagates the high-frequency signal from the filter 1, and a high-frequency signal from the output line 6 is a wiring board. 100 and an output terminal 7 for outputting to the outside.

  The filter 1 includes main lines 4 and 5, first open stubs 8, 9, 12 and 13, and second open stubs 10 and 11. In FIG. 1, in order to explain each component, each component is drawn separately, and each connection relationship is indicated by a line.

  The main line 4 is connected to the input line 3 and is shaped to have a line width W2 that is narrower than the line width W1 of the input line 3 with respect to the propagation direction of the high-frequency signal.

  The main line 5 is formed with the same line width W <b> 2 as the main line 4, one end is connected to the main line 4, and the other end is connected to the output line 6.

  Thus, the main lines 4 and 5 are formed so as to have a line width W2 narrower than the line width W1, and are connected between the input line 3 and the output line 6, so that they are input from the input line 3. The high frequency signal has an impedance higher than that of the input line 3.

  The first open stubs 8 and 9 have one end connected to the connection portion A between the input line 3 and the main line 4 so as to face each other, and the other end is open.

  The first open stubs 8 and 9 are molded so as to have a line length L1 of 1/12 wavelength of the fundamental wave included in the input high frequency signal. As a result, the line length L1 of the first open stubs 8 and 9 is ¼ wavelength for a triple wave having a frequency three times that of the fundamental wave included in the high-frequency signal. The third harmonic wave and the third harmonic wave totally reflected at the open ends of the first open stubs 8 and 9 cancel each other, and as a result, the third harmonic wave is attenuated.

  The second open stubs 10 and 11 have one end portion so as to face each other to the connection portion B which is between the main line 4 and the main line 5 and is separated from the connection portion A by P1. Each is connected and the other end is open. Here, P1 is the length of 1/8 wavelength of the fundamental wave included in the input high frequency signal.

  The second open stubs 10 and 11 are molded so as to have a line length L2 of 1/8 wavelength of the fundamental wave included in the input high frequency signal. As a result, for a double wave having a frequency twice that of the fundamental wave included in the high-frequency signal, the line length L2 of the second open stubs 10 and 11 is ¼ wavelength, and thus propagated from the main line 4. The second harmonic wave and the second harmonic wave totally reflected at the open ends of the second open stubs 10 and 11 cancel each other, and as a result, the second harmonic wave is attenuated.

  The first open stubs 12 and 13 have one end portion so as to face each other to the connection portion C which is between the main line 5 and the output line 6 and is separated from the connection portion B by P1. Each is connected and the other end is open. The first open stubs 12 and 13 have a line width W3 and a line length L1 like the first open stubs 8 and 9, and P1 is the fundamental wave included in the input high-frequency signal. The length is 1/8 wavelength.

  Further, the filter 1 is connected to the first open stubs 8, 9, 12, 13, the second open stubs 12, 11, and the main lines 4, 5 so that the filter 1 includes a spurious region included in the input high-frequency signal. It functions as a low-pass filter that attenuates the component. That is, the first open stubs 8, 9, 12, and 13 are thicker than the line width W1 of the input line 3, and the surface area of the first open stubs 8, 9, 12, and 13 determined by the components of the spurious region that attenuates. Is set to S1 so that the line width W3 satisfies the following mathematical formula 1.

W3 = S1 / L1 (Formula 1)
Similarly, when the second open stubs 10 and 11 are thicker than the line width W1 of the input line 3 and the surface area of the second open stubs 10 and 11 determined by the component of the spurious region to be attenuated is S2, It is molded so as to have a line width W4 that satisfies the following formula 2.

W4 = S2 / L2 (Formula 2)
As a result, the first open stubs 8, 9, 12, and 13 and the second open stubs 10 and 11 have lower impedance than the input line 3 and the main lines 4 and 5 with respect to the input high-frequency signal. The filter 1 has a characteristic as a low-pass filter by the combination of the first open stubs 8, 9, 12, and 13, the second open stubs 12 and 11, and the main lines 4 and 5. Become.

  FIG. 2A is a side view of the wiring board 100 according to the first embodiment of the present invention, and FIG. 2B is a diagram illustrating the implementation of the present invention when cut along the plane XY in FIG. 1 is a perspective view of a wiring board 100 that is Example 1. FIG.

  As shown in FIG. 2B, the wiring substrate 100 according to the first embodiment of the present invention is configured by a microstrip line substrate in which a filter 1 is disposed on a dielectric substrate 101 having a conductive foil formed on the back surface. ing.

  In addition, a shield part 102 having a cavity structure is fixed on the dielectric substrate 101 so as to cover the upper part of the filter 1, whereby the spatial propagation of the high-frequency signal from the filter 1 can be prevented.

  In addition, although the wiring board 100 which is Example 1 of this invention demonstrated the example applied to the board | substrate of a microstrip line, it is not restricted to this, It is also possible to apply the filter 1 to the board | substrate of a strip line. .

≪Function of wiring board≫
Next, the operation of the wiring board 100 according to the first embodiment of the present invention will be described with reference to FIG.

  When the high frequency signal input from the external high frequency circuit to the filter 1 through the input terminal 2 propagates through the input line 3 and reaches the connection portion A, the high frequency signal is transferred to the main line 4 side and the first open stubs 8 and 9 side. Branch off.

  The high-frequency signal branched to the first open stubs 8 and 9 side in the connection part A propagates in the first open stubs 8 and 9 and is totally reflected by the open ends of the first open stubs 8 and 9. Propagate to connection A. Then, the totally reflected high-frequency signal and the high-frequency signal propagated from the input line 3 are combined at the connection portion A.

  Here, the first open stubs 8 and 9 are formed so as to have a line length L1 of 1/12 wavelength of the fundamental wave included in the propagated high-frequency signal. For a triple wave having a triple frequency, the line length L1 of the first open stubs 8 and 9 is ¼ wavelength.

  Therefore, the phase of the third harmonic contained in the high-frequency signal propagated from the input line 3 and the third harmonic reflected by the open ends of the first open stubs 8 and 9 are 180 degrees different from each other. The third harmonic contained in the high frequency signal is attenuated.

  Next, when the high frequency signal in which the third harmonic wave is attenuated propagates through the main line 4 and reaches the connection portion B, it is branched to the main line 5 side and the second open stubs 10 and 11 side.

  The high-frequency signal branched to the second open stubs 10 and 11 side in the connection part B propagates through the second open stubs 10 and 11 and is totally reflected by the open ends of the second open stubs 10 and 11. Propagate to connection B. The totally reflected high-frequency signal and the high-frequency signal propagated from the main line 4 are combined at the connection point B.

  Here, the second open stubs 10 and 11 are formed so as to have a line length L2 of 1/8 wavelength of the fundamental wave included in the propagated high-frequency signal. For a double wave having a double frequency, the line length L2 of the second open stubs 10 and 11 is ¼ wavelength.

  Therefore, the phase of the double wave included in the high-frequency signal propagated from the main line 4 and the double wave totally reflected at the open ends of the first open stubs 8 and 9 are 180 degrees different from each other, so that they cancel each other. The second harmonic contained in the high frequency signal is attenuated.

  Further, when the high frequency signal in which the second harmonic is attenuated propagates through the main line 5 and reaches the connection portion C, the high frequency signal is generated by the first open stubs 12 and 13 in the same manner as the first open stubs 8 and 9. Attenuate the third harmonic from the signal.

  Further, the combination of the first open stubs 8, 9, 12, 13, the second open stubs 12, 11, and the main lines 4, 5 has a function as a low-pass filter. The component of the spurious region included in the high-frequency signal is attenuated from the high-frequency signal.

  FIG. 3 is a diagram showing an example of the simulation value of the high-frequency signal obtained by the wiring board 100 according to the first embodiment of the present invention.

  The high-frequency signal input from the external high-frequency circuit via the input terminal 2 includes a second harmonic 202 and a third harmonic 203 in addition to the fundamental wave 201.

  The attenuation amount 204 shown in FIG. 3 indicates the attenuation amount of the high frequency signal by a general open stub type trap circuit, and the attenuation amount 205 indicates the attenuation amount of the high frequency signal by a general low-pass filter.

  As described above, in a general open stub type trap circuit, sufficient attenuation cannot be obtained in a high-frequency spurious region. In a general low-pass filter, the second harmonic and third harmonic of the fundamental wave, etc. A sufficient amount of attenuation cannot be obtained for harmonics having a large noise level.

  On the other hand, the attenuation amount 205 shown in FIG. 3 indicates the attenuation amount of the high-frequency signal by the wiring board 100 according to the first embodiment of the present invention. According to the wiring board 100 according to the first embodiment of the present invention, the spurious region is shown. A sufficient amount of attenuation can be obtained, and a particularly large amount of attenuation can be obtained for harmonics.

  The first embodiment of the present invention has four first open stubs and two second open stubs, and attenuates a spurious region of a high-frequency signal input from a high-frequency circuit via an input line, A wiring board provided with a filter that particularly attenuates the harmonics of the second harmonic and the third harmonic contained in the input high-frequency signal has been described.

  In the second embodiment of the present invention, a filter having four first open stubs and four second open stubs in order to further attenuate the double wave of the fundamental wave included in the input high-frequency signal. A wiring board provided with will be described.

<< Configuration of wiring board >>
FIG. 4 is a configuration diagram showing the configuration of a wiring board that is Embodiment 2 of the present invention.

  The wiring board 100A according to the second embodiment of the present invention is connected to the input terminal 2 to which a high frequency signal is input from the outside of the wiring board 100A, the input line 3 connected to the input terminal 2, and the input line 3. A filter 1A that is a distributed constant circuit to which a high-frequency signal is input from the input line 3, an output line 6 that is connected to the filter 1A and propagates the high-frequency signal from the filter 1A, and a high-frequency signal from the output line 6 is a wiring board. And an output terminal 7 for outputting to the outside of 100A.

  The filter 1 </ b> A includes main lines 4, 5, 21, first open stubs 8, 9, 12, 13, and second open stubs 10, 11, 22, 23.

  Here, the main lines 4 and 5, the first open stubs 8, 9, 12, and 13, and the second open stub 10 are included in the configuration of the filter 1 </ b> A of the wiring board 100 </ b> A that is Embodiment 2 of the present invention. , 11 are the same as the configurations to which the same reference numerals are provided in the filter 1 of the wiring board 100 according to the first embodiment of the present invention.

  In other words, the filter 1A of the wiring board 100A according to the second embodiment of the present invention is characterized in that the filter 1 of the wiring board 100 according to the first embodiment of the present invention includes the configuration between the main line 4 and the main line 5. In addition, a main line 21 and second open stubs 22 and 23 are further provided.

  The main line 21 is connected in series between the main line 4 and the main line 5, and is formed with a line width W <b> 2 like the main lines 4 and 5.

  The second open stubs 22 and 23 are arranged at one end so as to face each other to the connection part D which is between the main line 21 and the main line 5 and is separated from the connection parts B and C by P1. The parts are connected to each other, and the other end is open. Here, P1 is the length of 1/8 wavelength of the fundamental wave included in the input high frequency signal.

  Similarly to the second open stubs 10 and 11, the second open stubs 22 and 23 are molded so as to have a line length L2 of 1/8 wavelength of the fundamental wave included in the input high-frequency signal. Yes. As a result, the second open stubs 22 and 23 have a line length L2 of ¼ wavelength for a double wave having a frequency twice that of the fundamental wave included in the high-frequency signal. The second harmonic wave and the second harmonic wave totally reflected at the open ends of the second open stubs 22 and 23 cancel each other, and as a result, the second harmonic wave is attenuated.

  Similarly to the second open stubs 10 and 11, the second open stubs 22 and 23 are molded to have a line width W4, and the first open stubs 8, 9, 12, and 13, By the combination of the second open stubs 10, 11, 22, and 23 and the main lines 4, 5, and 21, the filter 1A functions as a low-pass filter that attenuates components in the spurious region included in the input high-frequency signal. Have

  As described above, the wiring board 100A according to the second embodiment of the present invention includes, in addition to the configuration included in the filter 1 of the wiring board 100 according to the first embodiment of the present invention, between the main line 4 and the main line 5, Since the main line 21 and the second open stubs 22 and 23 are further provided, a sufficient amount of attenuation can be obtained in the spurious region, and compared with the wiring board 100 according to the first embodiment of the present invention, The second harmonic can be attenuated.

  In the second embodiment of the present invention, there are four first open stubs and four second open stubs, which attenuates a spurious region of a high-frequency signal input from a high-frequency circuit through an input line, A wiring board provided with a filter that particularly attenuates the harmonics of the second harmonic and the third harmonic contained in the input high-frequency signal has been described.

  In the third embodiment of the present invention, a filter having four first open stubs and six second open stubs in order to further attenuate the third harmonic wave of the fundamental wave included in the input high-frequency signal. A wiring board provided with will be described.

<< Configuration of wiring board >>
FIG. 5 is a configuration diagram showing a configuration of a wiring board that is Embodiment 3 of the present invention.

  The wiring board 100B according to the third embodiment of the present invention is connected to the input terminal 2 to which a high frequency signal is input from the outside of the wiring board 100B, the input line 3 connected to the input terminal 2, and the input line 3. A filter 1B that is a distributed constant circuit to which a high-frequency signal is input from the input line 3, an output line 6 that is connected to the filter 1B and propagates the high-frequency signal from the filter 1B, and a high-frequency signal from the output line 6 is a wiring board. And an output terminal 7 for outputting to the outside of 100B.

  The filter 1B includes main lines 4, 5, 21, and 31, first open stubs 8, 9, 12, and 13, and second open stubs 10, 11, 22, 23, 32, and 33. .

  Here, the main lines 4 and 5, the first open stubs 8, 9, 12, and 13, and the second open stub 10 are included in the configuration of the filter 1 </ b> B of the wiring board 100 </ b> B that is Embodiment 3 of the present invention. , 11, 22, and 23 are the same as the configurations with the same reference numerals provided in the filter 1 </ b> A of the wiring board 100 </ b> A according to the second embodiment of the present invention.

  That is, the feature of the filter 1B of the wiring board 100B according to the third embodiment of the present invention is that the filter 1A of the wiring board 100A according to the second embodiment of the present invention has a configuration provided between the main line 21 and the main line 5. In addition, a main line 31 and second open stubs 32 and 33 are further provided.

  The main line 31 is connected in series between the main line 21 and the main line 5, and is formed with a line width W <b> 2 like the main lines 4, 5, and 21.

  The second open stubs 32 and 33 are arranged at one end so as to face each other to the connection part E that is between the main line 31 and the main line 5 and is separated from the connection parts B and D by P1. The parts are connected to each other, and the other end is open. Here, P1 is the length of 1/8 wavelength of the fundamental wave included in the input high frequency signal.

  Similarly to the second open stubs 10 and 11, the second open stubs 32 and 33 are molded to have a line length L2 of 1/8 wavelength of the fundamental wave included in the input high-frequency signal. Yes. As a result, the line length L2 of the second open stubs 32 and 33 is ¼ wavelength for a double wave having a frequency twice that of the fundamental wave included in the high-frequency signal. The second harmonic wave and the second harmonic wave totally reflected at the open ends of the second open stubs 22 and 23 cancel each other, and as a result, the second harmonic wave is attenuated.

  Similarly to the second open stubs 10 and 11, the second open stubs 32 and 33 are formed to have a line width W4, and the first open stubs 8, 9, 12, and 13, By the combination of the second open stubs 10, 11, 22, 23, 32, and 32 and the main lines 4, 5, 21, and 31, the filter 1B attenuates spurious region components included in the input high-frequency signal. It functions as a low-pass filter.

  As described above, the wiring board 100B according to the third embodiment of the present invention includes the main line 21 between the main line 21 and the main line 5 in addition to the configuration included in the wiring board 100A according to the second embodiment of the present invention. Since the second open stubs 22 and 23 are further provided, sufficient attenuation can be obtained in the spurious region, and twice as much as that of the wiring board 100A according to the second embodiment of the present invention. Waves can be attenuated.

  The first embodiment of the present invention has four first open stubs and two second open stubs, and attenuates a spurious region of a high-frequency signal input from a high-frequency circuit via an input line, A wiring board provided with a filter that particularly attenuates the harmonics of the second harmonic and the third harmonic contained in the input high-frequency signal has been described.

  In the fourth embodiment of the present invention, a filter having eight first open stubs and two second open stubs in order to further attenuate the third harmonic of the fundamental wave included in the input high-frequency signal. A wiring board provided with will be described.

<< Configuration of wiring board >>
FIG. 6 is a configuration diagram showing the configuration of a wiring board that is Embodiment 4 of the present invention.

  The wiring board 100C according to the fourth embodiment of the present invention is connected to the input terminal 2 to which a high frequency signal is input from the outside of the wiring board 100C, the input line 3 connected to the input terminal 2, and the input line 3. A filter 1C that is a distributed constant circuit to which a high-frequency signal is input from the input line 3, an output line 6 that is connected to the filter 1C and propagates the high-frequency signal from the filter 1C, and a high-frequency signal from the output line 6 is a wiring board. And an output terminal 7 for outputting to the outside of 100C.

  The filter 1 </ b> C includes main lines 4, 5, 41, 45, first open stubs 8, 9, 12, 13, 42, 43, 46, 47, and second open stubs 10, 11. .

  Here, the main lines 4 and 5, the first open stubs 8, 9, 12, and 13, and the second open stub 10 are included in the configuration of the filter 1 </ b> C of the wiring board 100 </ b> C that is Embodiment 4 of the present invention. , 11 are the same as the configurations to which the same reference numerals are provided in the filter 1 of the wiring board 100 according to the first embodiment of the present invention.

  That is, the feature of the wiring board 100C according to the fourth embodiment of the present invention is that the wiring board 100 according to the first embodiment of the present invention includes the main line 41 and the main line 41 between the main line 4 and the main line 5. A main line 45 and a first open stub 42, 43, 46, 47.

  The main line 41 is connected to the main line 4 and is shaped so as to have a line width W2 like the main lines 4 and 5.

  The main line 45 is formed with the same line width W <b> 2 as the main line 41, one end is connected to the main line 41, and the other end is connected to the main line 5.

  Thus, the main lines 4, 41, 45, 5 are connected in series between the input line 3 and the output line 6.

  The first open stubs 42 and 43 are arranged at one end so as to face each other to the connection part F that is between the main line 4 and the main line 41 and is separated from the connection parts A and B by P1. The parts are connected to each other, and the other end is open. Here, P1 is the length of 1/8 wavelength of the fundamental wave included in the input high frequency signal.

  The first open stubs 42 and 43 are molded so as to have a line length L1 of 1/12 wavelength of the fundamental wave included in the input high-frequency signal, like the first open stubs 8 and 9. Yes. As a result, the line length L1 of the first open stubs 42 and 43 is ¼ wavelength for a triple wave having a frequency three times that of the fundamental wave included in the high-frequency signal. The third harmonic wave and the third harmonic wave totally reflected at the open ends of the first open stubs 42 and 43 cancel each other, and as a result, the third harmonic wave is attenuated.

  The first open stubs 46 and 47 are connected between the main line 45 and the main line 5 and one of the first open stubs 46 and 47 so as to face the connection part G, which is a position separated from the connection parts B and C by P1. Each end is connected, and the other end is open. Here, P1 is the length of 1/8 wavelength of the fundamental wave included in the input high frequency signal.

  Similar to the first open stubs 8 and 9, the first open stubs 42 and 43 are molded to have a line length L1 of 1/12 wavelength of the fundamental wave included in the input high-frequency signal.

  The first open stubs 42, 43, 46, 47 are formed so as to have the line width W 3, similar to the first open stubs 8, 9, and the first open stubs 8, 9, 12 are formed. , 13, 42, 43, 46, 47, the second open stubs 10, 11, and the main lines 4, 5, 41, 45, the filter 1C has a spurious region included in the input high-frequency signal. It functions as a low-pass filter that attenuates the component.

  As described above, the wiring board 100C according to the fourth embodiment of the present invention includes, in addition to the configuration included in the filter 1 of the wiring board 100 according to the first embodiment of the present invention, between the main line 4 and the main line 5, Since the main lines 41 and 45 and the first open stubs 42, 43, 46 and 47 are further provided, a sufficient attenuation can be obtained in the spurious region and the wiring board according to the first embodiment of the present invention. Compared with 100, the third harmonic can be attenuated.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment of the present invention. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

It is a block diagram which shows the structure of the wiring board which is Example 1 of this invention. (A) is a side view of the wiring board which is Example 1 of this invention, (b) is the wiring board which is Example 1 of this invention at the time of cut | disconnecting by plane XY in (a). It is a perspective view. It is the figure which showed an example of the simulation value of the high frequency signal obtained by the wiring board which is Example 1 of this invention. It is a block diagram which shows the structure of the wiring board which is Example 2 of this invention. It is a block diagram which shows the structure of the wiring board which is Example 3 of this invention. It is a block diagram which shows the structure of the wiring board which is Example 4 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C ... Filter, 2 ... Input terminal, 3 ... Input line, 4, 5, 21, 31, 41, 45 ... Main line, 6 ... Output line, 7 ... Output terminal, 8, 9, 12 , 13, 42, 43, 46, 47 ... first open stub, 100, 100A, 100B, 100C ... wiring board, 101 ... dielectric substrate, 102 ... shield part.

Claims (4)

A wiring board provided with a filter composed of a distributed constant circuit that attenuates a desired frequency region from a high-frequency signal input through an input line and outputs the signal through an output line,
The filter is
A main line that connects the input line and the output line, is narrower than a line width of the input line, and has a line length of a quarter wavelength of a predetermined frequency included in the high-frequency signal;
The line width of the input line, one end of which is connected to the connecting part between the main line and the input line and the connecting part between the main line and the output line so as to face each other two by two. Four first open stubs that are thicker and have a line length of 1/12 wavelength of the predetermined frequency;
Two second ends each having one end connected to the center of the main line so as to face each other and having a line length of １ ／ wavelength of the predetermined frequency and wider than the width of the input line. A wiring board comprising an open stub. A wiring board including a filter configured by a distributed constant circuit that attenuates a desired frequency region from a high-frequency signal input through an input line and outputs the signal through an output line,
The filter is
A main line that connects the input line and the output line, is narrower than the line width of the input line, and has a line length of 3/8 wavelength of a predetermined frequency included in the high-frequency signal;
One end of each of the first connection part that connects the main line and the input line and the second connection part that connects the main line and the output line are opposite to each other. Four first open stubs connected to each other and having a line length of 1/12 wavelength of the predetermined frequency and wider than the line width of the input line;
One end of each of the main lines on the main line is opposed to each other at a distance of 1/8 wavelength of the predetermined frequency inward from the first connection and the second connection. A wiring board comprising: four second open stubs connected to each other and having a line length of 1/8 wavelength of the predetermined frequency and wider than the width of the input line. A wiring board provided with a filter composed of a distributed constant circuit that attenuates a desired frequency region from a high-frequency signal input through an input line and outputs the signal through an output line,
The filter is
A main line that connects the input line and the output line, is narrower than the line width of the input line, and has a line length of ½ wavelength of a predetermined frequency included in the high-frequency signal;
One end of each of the first connection part that connects the main line and the input line and the second connection part that connects the main line and the output line are opposite to each other. Four first open stubs connected to each other and having a line length of 1/12 wavelength of the predetermined frequency and wider than the line width of the input line;
The center position of the main line and the position on the main line that are spaced apart from each other by 1/8 wavelength of the predetermined frequency inward from the first connection portion and the second connection portion, respectively, are opposed to each other. And six second open stubs each having one end connected to each other and having a line length of 1/8 wavelength of the predetermined frequency and wider than the width of the input line. A characteristic wiring board. A wiring board provided with a filter composed of a distributed constant circuit that attenuates a desired frequency region from a high-frequency signal input through an input line and outputs the signal through an output line,
The filter is
A main line that connects the input line and the output line, is narrower than the line width of the input line, and has a line length of ½ wavelength of a predetermined frequency included in the high-frequency signal;
A first connecting part for connecting the main line and the input line; a second connecting part for connecting the main line and the output line; the first connecting part and the second on the main line; Each of which is connected to the inside of the connecting portion by a distance of 1/8 wavelength of the predetermined frequency, and one end thereof is connected so as to face each other two by one, thicker than the line width of the input line, And eight first open stubs having a line length of 1/12 wavelength of the predetermined frequency;
Two second ends each having one end connected to the center position of the main line so as to face each other and having a line length of 1/8 wavelength of the predetermined frequency and wider than the width of the input line. And an open stub.

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