JP4511397B2 - Multilayer stripline filter - Google Patents

Description

  The present invention relates to a multilayer stripline filter for a high-frequency circuit composed of a line conductor, which is used in, for example, wireless communication devices such as mobile phones and wireless LANs and other various communication devices.

  In recent years, filters used in mobile communication devices such as mobile phones have resonated distributed constant circuits from filters using dielectric coaxial resonators in response to demands for thinner and smaller mobile communication devices. It has progressed to the laminated stripline filter used in the vessel.

  As an example of such a conventional multilayer stripline filter, Japanese Patent Application Laid-Open No. 9-331201 proposes a configuration shown in an exploded perspective view of FIG. 9 and a perspective plan view of FIG.

  9 and 10, reference numeral 30 denotes a dielectric in which first to third dielectric layers 30a to 30c are sequentially stacked, and reference numerals 31 and 32 denote between the first dielectric layer 30a and the second dielectric layer 30b. The first one-end open line conductor, the first one-end short-circuit line conductor, the end of the first one-end open-line conductor 31 opposite to the open end 37, and the first one-end short-circuit line conductor 32. The short-circuit end 38 and the opposite end are electrically connected. Reference numerals 33 and 34 denote second one-end open line conductors and second one-end short-circuit line conductors arranged between the second dielectric layer 30b and the third dielectric layer 30c. The end of 33 opposite to the open end 37 is electrically connected to the end of the second short-circuited line conductor 34 opposite to the short-circuited end 38. Reference numeral 35 denotes a pair of ground electrodes disposed on both upper and lower sides of the dielectric 30, and 36 denotes a connection conductor. In the dielectric 30, the first and second one-end open line conductors 31, 33 are arranged so that at least a part thereof is opposed to each other when viewed from the stacking direction, and are coupled electromagnetically, and the first The second one-end short-circuited line conductors 32 and 34 are disposed so that at least a part thereof is opposed to each other when viewed from the stacking direction, and are coupled electromagnetically. In FIG. 10, the pair of ground electrodes 35 and connection conductors 36 are not shown.

  The short-circuit ends 38 of the first and second one-end short-circuit line conductors 32 and 34 are electrically connected to the pair of ground electrodes 35 via the connection conductor 36, respectively.

  FIG. 11 is a circuit diagram showing the configuration of the conventional multilayer stripline filter. FIG. 12 shows filter characteristics realized by the conventional multilayer stripline filter.

  The width W1 of the first and second one-end open line conductors 31 and 33, the width W2 of the first and second one-end short-circuited line conductors 32 and 34, the first one-end open line conductor 31 and the second one-end open The width W3 where the line conductor 33 overlaps the dielectric layer 30b and the width W4 where the first one-end short-circuit line conductor 32 and the second one-end short-circuit line conductor 34 overlap each other across the dielectric layer 30b are adjusted. As a result, a capacitance is formed as an electromagnetic field coupling formed between the first one-end open line conductor 31 and the second one-end open line conductor 33 and between the first one-end short-circuit line conductor 32 and the second one-end short-circuit line conductor 34. When the sexual coupling becomes dominant, the filter characteristic (FIG. 12-a) having one attenuation pole on the low band side with respect to the pass band is obtained. On the contrary, when the inductive coupling becomes dominant, the pass band is obtained. With one attenuation pole on the high-frequency side Data characteristics has been realized (FIG. 12-b).

As another example of a conventional multilayer stripline filter, Japanese Patent Application Laid-Open No. 8-70201 proposes a configuration shown in FIG. Figure 13 is compared with FIG. 9, the third one-end open line conductor 39, and, by the third one end short-circuited line conductor 40 is added to the further construction of a conventional multilayer stripline filter is connected 2-stage Therefore, the amount of attenuation outside the pass band is increased by increasing the number of connection stages of the multilayer stripline filter.

On the other hand, in recent years, various types of wireless communication devices such as mobile phones and wireless LANs have emerged. In order to select a desired wireless communication frequency signal from among the mixed wireless communication frequency signals, The demand for increasing the amount of attenuation outside the passband has become apparent for the filters used. In addition, with the trend of miniaturization of wireless communication devices, there is an increasing demand for miniaturization of filters used inside various communication devices.
JP-A-9-331201 Japanese Patent Laid-Open No. 8-70201

  However, in the conventional multilayer stripline filter proposed in Japanese Patent Laid-Open No. 9-331201, one attenuation pole is provided on the low band side or one attenuation pole is provided on the high band side with respect to the pass band. However, since it can only be formed, there is a problem that a sufficient amount of attenuation outside the passband cannot be secured.

Further, the method of increasing the attenuation outside the passband of a conventional multilayer stripline filter proposed in JP-A-8-70201 discloses connecting two stages, because has a structure that connects the filter 2-stage However, the size of the laminated stripline filter in the planar direction is increased, and there is a problem that it is impossible to meet the demand for miniaturization.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a multilayer stripline filter having high attenuation and a small size.

In the laminated stripline filter of the present invention, the first and second line conductors, one end of which is a short-circuited end and the other end of which is an open-ended end, are laminated in a laminate formed by laminating a plurality of dielectric layers. wherein at least a portion across the dielectric layer causes disposed opposite between, distribution a pair of ground electrodes on either side of the stacking direction of the dielectric layer to the first and second line conductor And a third line conductor and a second line conductor , one end of which is short-circuited between the pair of ground electrodes and the other end of which is electrically connected to the first line conductor via a connecting conductor . the line conductor and electrically connected to the fourth line conductor, both sides of the laminate with respect to said planar perspective first and second line conductor perpendicular to the line direction of該線path conductor direction, that wherein the first and second line across the conductor該線path conductors of the line Arranged in a direction perpendicular to the direction, also one end is an open end, the other end of the first via respective connecting conductor line conductor and electrically connected to the fifth line conductor and the second the line conductor and electrically connected to the sixth line conductor, both sides of the laminate with respect to said planar perspective first and second line conductor perpendicular to the line direction of該線path conductor direction, that wherein across the first and second line conductor arranged in a direction perpendicular to the line direction of該線path conductors, further the third and fifth line conductor said first line conductors to該線path conductor on both sides direction of the line direction orthogonal, and characterized in that arranged the fourth and sixth line conductor on either side of the direction perpendicular to the line direction of該線path conductors relative to the second line conductor To do.

The multilayer stripline filter of the present invention, the first open end between the fifth line conductor, and the second, electrically connected open end between the sixth line conductor via a connecting conductor It is characterized by being.

According to the multilayer strip line filter of the present invention, the first and second line conductors having one end as a short-circuited end and the other end as an open end inside a multilayer body formed by laminating a plurality of dielectric layers. the at least partially across the dielectric layer causes disposed opposite between, distribution a pair of ground electrodes on either side of the stacking direction of the dielectric layer to the first and second line conductor and setting, between a pair of ground electrodes, one end and the short-circuited end, and a third line conductor and the second line conductor whose other end is electrically connected to the first line conductor via respective connecting conductor the fourth line conductor which is electrically connected, laminate perspective plan to both sides of the first and second of relative line conductor a direction perpendicular to the line direction of the line conductor, that the first and second Place the line conductor in a direction perpendicular to the line direction of the line conductor. Further, the first end is an open end, the other end of which is electrically connected to the fifth line conductor and a second line conductor which is the first line conductor and electrically connected through the connection conductor 6 the line conductor of the line conductor, both sides of the first and second line direction with respect to the conductor perpendicular to the line direction of the line conductor laminate in a plan perspective, i.e. across the first and second line conductor line arranged in a direction perpendicular to the direction, further on either side of the third and the fifth line conductor with respect to the first line conductor a direction perpendicular to the line direction of the line conductor, the fourth and sixth the line conductor with respect to the second line conductor by disposing on both sides in the direction perpendicular to the line direction of the line conductor, the low-frequency side of the pass band in the first and second line conductors, or the high frequency side In addition to being able to form one attenuation pole, 3. A new attenuation pole is formed on the high band side of the pass band by the resonance circuit formed by the third and fifth line conductors and the resonance circuit formed by the connecting conductor and the fourth and sixth line conductors. it is possible to, without increasing the number of stages of stacked stripline filter, it is possible to increase the attenuation outside the pass band further. As a result, a high-attenuation and small-sized multilayer stripline filter can be provided.

  Further, since the pass band can be shifted to the low frequency side by the inductance component of the connecting conductor, the length of each line conductor in the line direction can be shortened. As a result, a more compact laminated stripline filter can be provided.

According to the multilayer stripline filter of the present invention, the open ends of the first and third line conductors and the open ends of the second and fourth line conductors are connected to each other via the connecting conductor. with 1 and the open end between the third line conductor is electrically common open end, since the open end between the second and fourth line conductor is electrically common open end, the connection conductor through caused by using the electrically connected, the difference between the electrical length leading to the open end of the via connection conductor and the electrical length leading to the open end of the first line conductor a third line conductor, and the second the difference can be relaxed electrical length leading to the open end of the line conductor and the electrical length leading to the open end of the fourth line conductor via a connecting conductor, the difference in electrical length leading to these open ends Suppresses anti-resonance phenomenon on the high side of the passband caused by Door can be. As a result, it is possible to increase the attenuation outside the pass band further, it is possible to provide a high attenuation and small layered stripline filter further.

  The laminated stripline filter of the present invention will be described below with reference to the drawings. In the following embodiment, a multilayer stripline filter corresponding to the frequency of a wireless LAN (frequency band 5 GHz), which is a system in which peripheral devices such as a personal computer and a printer are connected wirelessly, will be described.

  1 is an exploded perspective view showing an example of an embodiment of a first laminated stripline filter according to claim 1 of the present invention, and FIG. 2 is a perspective plan view of FIG. 1 viewed from the laminating direction.

  1 and 2, 10a is a first dielectric layer, 10b is a second dielectric layer, 10c is a third dielectric layer, 11 is a first line conductor, 12 is a second line conductor, Reference numeral 13 denotes a third line conductor, 14 denotes a fourth line conductor, 15 denotes a fifth line conductor, 16 denotes a sixth line conductor, 17 denotes a ground electrode, and 18 denotes a connecting conductor.

  The first to sixth line conductors 11 to 14 each have an open end 19 and a short-circuit end 20, and the second line conductor 12 is provided between the first dielectric layer 10a and the second dielectric layer 10b. , The fourth line conductor 14 and the sixth line conductor 16 are disposed, and the first line conductor 11 and the third line conductor 13 are provided between the second dielectric layer 10b and the third dielectric layer 10c. A fifth line conductor 15 is provided, the first line conductor 11 is electrically connected to the third and fifth line conductors 13 and 15 via the connecting conductor 18, and the second line conductor 12 is the first line conductor 12. 4 and the sixth line conductors 14 and 16 and the connection conductor 18 are electrically connected.

The further first dielectric layer 10a a pair of ground electrodes 17 on the upper side of the lower side and the third dielectric layer 10c of are arranged in each of the first to sixth line conductor 11 through 16 The short-circuit end 20 is electrically grounded by a side conductor (not shown).

  In addition, the first line conductor 11 and the second line conductor 12 are disposed so that at least a part of the first line conductor 11 and the second line conductor 12 face each other with the second dielectric layer 10b interposed therebetween.

  In FIG. 2, the pair of ground electrodes 17 are not shown.

  The laminated body 10 including the first to third dielectric layers 10a to 10c used in the first laminated stripline filter of the present invention includes, for example, ceramic materials such as alumina ceramics and mullite ceramics, inorganic materials such as glass ceramics, Or tetrafluoroethylene resin (polytetrafluoroethylene; PTFE), tetrafluoroethylene-ethylene copolymer resin (tetrafluoroethylene-ethylene copolymer resin; ETFE), tetrafluoroethylene-perfluoroalkoxyethylene copolymer resin ( A fluorocarbon resin such as tetrafluoroethylene-perfluteroalkyl vinyl ether copolymer resin (PFA) or a resin-based material such as glass epoxy resin or polyimide is used. The shape and dimensions (thickness, width, and length) of the laminated body 10 including the first to third dielectric layers 10a to 10c made of these materials are set according to the frequency and application to be used.

First laminated stripline first to sixth line conductor 11 through 16 used in the filter of the present invention, a pair of ground electrodes 17, connection conductor 18, the conductor layer of a metal material for high frequency signal transmission, for example, Cu layer, Ni-plated layer and Au-plated layer deposited on Mo-Mn metallized layer. Ni-plated layer and Au-plated layer deposited on W metallized layer. Cr-Cu alloy layer Cr- Ni plating layer and Au plating layer deposited on Cu alloy layer ・ Ni—Cr alloy layer and Au plating layer deposited on Ta ₂ N layer ・ Pt layer and Au plating on Ti layer It is formed by a thick film printing method or various thin film forming methods, plating methods, etc. using a layer deposited, or a Ni-Cr alloy layer deposited with a Pt layer and an Au plating layer. The The thickness and width are also set according to the frequency and application of the high-frequency signal transmitted.

  The material and the forming method of the first laminated stripline filter of the present invention described above are the same for the second laminated stripline filter of the present invention described later.

  In the production of the laminated body 10 including the first to third dielectric layers 10a to 10c used in the first laminated stripline filter of the present invention, for example, each dielectric layer including the dielectric layers 10a to 10c is made of glass ceramics. First, a glass ceramic green sheet as a dielectric layer is prepared, a predetermined punching process is performed on the green sheet to form a through hole as a through conductor, and then a conductor such as Cu is formed by screen printing. The paste is filled in the through holes, and a predetermined pattern of each line conductor and other conductor layer patterns are printed and applied. Next, baking is performed at 850 to 1000 ° C., and finally Ni plating and Au plating are performed on each conductor layer.

  FIG. 3 is a circuit diagram of the first multilayer stripline filter of the present invention shown in FIGS. 1 and 2, and FIG. 4 can be realized by the first multilayer stripline filter of the present invention shown in FIGS. It is a filter characteristic figure.

In the first multilayer stripline filter of the present invention, one end is a short-circuit end 20 and the other end is an open end 19 inside a multilayer body in which first to third dielectric layers 10a to 10c are sequentially stacked. The formed first and second line conductors 11 and 12 are disposed so that at least a part of the first and second line conductors 11 and 12 face each other with the second dielectric layer 10b interposed therebetween. , disposed a pair of grounding electrodes 17 on both sides in the laminating direction of the laminate with respect to 12, between the pair of ground electrodes 17 in addition, connected to the first line conductor 1 1 one end is short-circuited end 20 The third line conductor 13 electrically connected via the conductor 18 and the fourth line electrically connected to the second line conductor 12 via the connecting conductor 18 while one end thereof is a short-circuited end 20. the conductor 14, together with the other end is an open end 1 9 first Communicating with the fifth line conductor 15 and one end which is electrically connected via a line conductor 1 1 and the connecting conductor 18 is an open end 19 to the second line conductor 12
The sixth line conductor 16 electrically connected through the connection conductor 18 is arranged so as to be shifted in the direction orthogonal to the stacking direction, whereby the connection conductor 18 and the third line conductor 13 shown in FIG. The resonance circuit 1 formed by the fifth line conductor 15 and the resonance circuit 2 formed by the connecting conductor 18, the fourth line conductor 14, and the sixth line conductor 16 can be configured. This result, low-frequency side of the pass band in the first and second line conductors 11, 12, or, in addition to being able to form one attenuation pole on the high frequency side, and the resonance circuit 1 and the resonant circuit 2, can be one new attenuation pole formed on the high frequency side of the pass band can be realized filter characteristic having two attenuation poles shown in FIG. 4 (a) or FIG. 4 (b). As a result, without increasing the number of stages of stacked stripline filter, it is possible to increase the attenuation outside the passband Furthermore, it is possible to provide a high attenuation and small layered stripline filter.

  FIG. 5 is a graph showing frequency characteristics of the first multilayer stripline filter of the present invention shown in FIGS. 1 and 2. In FIG. 5, the horizontal axis represents the frequency (unit: GHz), the vertical axis represents the frequency characteristic of the multilayer stripline filter in signal attenuation (unit: dB), and the characteristic curve of the a line represents the first multilayer of the present invention. The frequency characteristics of the strip line filter and the frequency characteristics of the b line indicate the frequency characteristics of the conventional multilayer strip line filter. The thicknesses of the first to third dielectric layers 10a to 10c in the first multilayer stripline filter of the present invention and the conventional multilayer stripline filter are set to be the same.

From the result of FIG. 5, according to the first multilayer stripline filter of the present invention, the resonance circuit 1 and the resonance circuit 2 shown in FIG. It can be seen that one new attenuation pole can be formed and a filter characteristic having two attenuation poles can be realized. As a result, without increasing the number of stages of stacked stripline filter, it is possible to increase the attenuation outside the passband Furthermore, it is possible to provide a high attenuation and small layered stripline filter. For example, in the case of the example shown in FIG. 5, the size of the first laminated stripline filter of the present invention is about 30% smaller than the conventional laminated stripline filter.

In the multilayer stripline filter of the present invention, the passband can be shifted to the low frequency side by the inductance component of the connecting conductor 18, so that the length of each line conductor 11-16 in the line direction can be set short. , it can be made smaller with the result further. For example, in the case of the example shown in FIG. 5, the size in the line direction can be reduced by about 20%.

  For the first to sixth line conductors 11 to 16, the line width on the open end side and the line width on the short-circuit end side of each line conductor may be arbitrarily set according to the filter specifications and the like.

  Next, an embodiment of the second laminated stripline filter according to claim 2 of the present invention is shown in an exploded perspective view of FIG. 6 and a perspective plan view of FIG. 6 and 7, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.

6 and 7, with respect to Figures 1 and 2, both connected to the open end 19 of the first line conductor 11 to further an open end 19 of the fifth line conductor 15 by a connecting conductor 21, the second The open end 19 of the line conductor 12 and the open end 19 of the sixth line conductor 16 are connected by a connecting conductor 21. With this configuration, the open ends 19 of the first and fifth line conductors 11 and 15 become an electrically common open end, and the second and sixth line conductors 12 and 16 are open. since the end 19 to each other in an electrically common open end, caused by electrically connected via the connecting conductor 18, connected to the electrical length leading to the open end 19 of the first line conductor 11 conductor 18
Difference of the electrical length reaching the open end 19 of the fifth line conductor 15 via the connection line 18 and the electrical length reaching the open end 19 of the second line conductor 12 and the connecting conductor 18 The difference in electrical length to 16 open ends 19 can be alleviated, and the anti-resonance phenomenon on the high frequency side of the pass band caused by the difference in electrical length to these open ends can be suppressed. . As a result, it is possible to increase the attenuation outside the pass band further, it is possible to provide a high attenuation and small layered stripline filter further.

  FIG. 8 is a graph showing frequency characteristics of the second multilayer stripline filter of the present invention shown in FIGS. In FIG. 8, the horizontal axis represents the frequency (unit: GHz), the vertical axis represents the frequency characteristic of the multilayer stripline filter by the signal attenuation (unit: dB), and the characteristic curve of the c line is the second multilayer of the present invention. The frequency characteristics of the strip line filter and the frequency characteristics of the d line indicate the frequency characteristics of the first multilayer strip line filter of the present invention. Note that the thicknesses of the first to third dielectric layers 10a to 10c in the first and second multilayer stripline filters of the present invention are set to be the same.

From the result of FIG. 8, according to the second laminated stripline filter of the present invention, the open end 19 of the first line conductor 11 and the open end 19 of the fifth line conductor 15 are connected by the connecting conductor 21. Since the open end 19 of the second line conductor 12 and the open end 19 of the sixth line conductor 16 are connected by the connecting conductor 21, the open ends 19 of the first and fifth line conductors 11 and 15 are connected to each other. it becomes electrically common open end, a second, between the open end 19 of the sixth line conductor 12, 16 to become an electrically common open end, are electrically connected via the connecting conductor 18 The difference between the electrical length reaching the open end 19 of the first line conductor 11 and the electrical length reaching the open end 19 of the fifth line conductor 15 via the connecting conductor 18, and the second line conductor 12. The electrical length to the open end 19 of the wire and the connecting conductor 18 Thus, the difference in electrical length to the open end 19 of the sixth line conductor 16 can be alleviated, and the anti-resonance phenomenon on the high band side of the pass band caused by the difference in electrical length to these open ends Can be suppressed. As a result, it is possible to increase the attenuation outside the pass band further, it is possible to provide a high attenuation and small layered stripline filter further.

  The laminated stripline filter of the present invention is not limited to the example of the above embodiment, and various modifications may be made without departing from the gist of the present invention.

For example, in the example shown in FIG. 1, the multilayer stripline filter of the present invention includes the first line conductor 11, the third line conductor 13, and the fifth line conductor 15 arranged on the same plane, The two line conductors 12, the fourth line conductor 14, and the sixth line conductor 16 are disposed on the same plane, but each line conductor may be disposed on an arbitrary plane. By arranging an arbitrary plane, provide a high-performance multilayer stripline filter design flexibility of the multilayer stripline filter formed inside of a plurality of dielectric layers stacked is increased to further, small to further can do.

  Further, the first to sixth line conductors 11 to 16 used for forming the laminated stripline filter have the same length in each line conductor in the example of FIG. The length of the conductor may be set arbitrarily.

In the example shown in FIG. 1, the laminated stripline filter of the present invention has a pair of ground electrodes 17 disposed below the first dielectric layer 10a and above the third dielectric layer 10c. the first to sixth line conductor 11 through 16 between the ground electrode 17 but are configured to be arranged, not limited to this embodiment, another to further between the pair of ground electrodes 17 of the A plurality of ground electrodes may be inserted. By multiple insert another ground electrode to further between the pair of ground electrodes 17, the line width of the first to sixth line conductor 11 through 16 it is possible to adjust further, a plurality of dielectric laminated can design flexibility of the multilayer stripline filter formed inside of the body layer is improved to further, to provide a high-performance multilayer stripline filter small in further.

  Further, the first to sixth line conductors 11 to 16 used for forming the multilayer stripline filter are each formed of a single line conductor in the example of FIG. You may form with several conductors which can be regarded as a track | line.

The system in which the laminated stripline filter is used may be GSM (Global System for Mobile Communications), DCS (Digital Cell System), Bluetooth (registered trademark) , or the like.

  In addition, in the example of FIG. 1, the laminated body used for forming the laminated stripline filter shows a case where the laminated body includes three layers of the first to third dielectric layers 10a to 10c. The number may be four or more.

It is a disassembled perspective view which shows an example of embodiment of the lamination | stacking stripline filter of this invention. 1 is a perspective plan view showing an example of an embodiment of a laminated stripline filter of the present invention. It is a circuit diagram of the lamination | stacking stripline filter of this invention. Signal attenuation in the multilayer stripline filter of the present invention (unit: dB) is a diagram showing a. Signal attenuation in the multilayer stripline filter and conventional multilayer stripline filter of the present invention (unit: dB) is a diagram showing a. It is a disassembled perspective view which shows the other example of embodiment of the lamination | stacking stripline filter of this invention. It is a see-through | perspective top view which shows the other example of embodiment of the lamination | stacking stripline filter of this invention. Signal attenuation in the multilayer stripline filter of the present invention (unit: dB) is a diagram showing a. It is a disassembled perspective view of the conventional multilayer stripline filter. FIG. 6 is a perspective plan view of a conventional multilayer stripline filter. It is a circuit diagram of the conventional multilayer stripline filter. Signal attenuation in conventional multilayer stripline filter (unit: dB) is a diagram showing a. It is a disassembled perspective view of the conventional multilayer stripline filter.

Explanation of symbols

10a: first dielectric layer 10b: second dielectric layer 10c: third dielectric layer 11: first line conductor 12: second line conductor 13: third line conductor 14: fourth Line conductor 15: Fifth line conductor 16: Sixth line conductor 17: Ground electrode 18: Connection conductor 19: Open end 20: Short-circuit end 21: Connection conductor

Claims (2)

Inside the laminate formed by laminating a plurality of dielectric layers, the first and second line conductors, one end of which is a short-circuited end and the other end is an open end, are sandwiched between the dielectric layers. causes disposed so as to at least partly opposed, arranged a pair of ground electrodes on either side of the stacking direction of the dielectric layer to the first and second line conductors,
Between the pair of ground electrodes, one end and the short-circuited end, and a third line conductor and the second line conductor whose other end is electrically connected to each of the first line conductor via a connecting conductor the fourth line conductor which is electrically connected, in a plan perspective of the laminate arranged on both sides of the first and second line direction with respect to the conductor perpendicular to the line direction of該線path conductors, also The fifth line conductor and the second line conductor are electrically connected to the first line conductor and the second line conductor , one end being an open end and the other end being electrically connected to the first line conductor via a connecting conductor, respectively. 6 of the line conductor, and a transparent plan view of the laminate arranged on both sides of the first and second line direction with respect to the conductor perpendicular to the line direction of該線path conductors,
Further, the third and fifth the line conductor on both sides in the direction perpendicular to the line direction of該線path conductors relative to said first line conductors of said fourth and sixth line conductor said second line laminated stripline filter, characterized in that arranged on both sides of the direction in respect to the conductor perpendicular to the line direction of該線path conductors. Claims, characterized in that said open end between the first and fifth line conductor, if the open end between the second and sixth line conductor in beauty are electrically connected via a connecting conductor Item 2. The laminated stripline filter according to Item 1.

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