JP2021061474A - Structure - Google Patents

Abstract

To make the maximum length when viewed in a plan view shorter than before in a structure that can be used as a diplexer or a divider.SOLUTION: In a structure (1), a first conductor layer (11), a first dielectric layer (12), a second conductor layer (13), a second dielectric layer (14), and a third conductor layer (15) are laminated in this order. In each of the first dielectric layer (12) and the second dielectric layer (14), a first post-wall waveguide (120) and a second post wall waveguide (140) are formed parts of which overlap with each other, and which function as a resonator-coupled filter, and in the second conductor layer (13), a coplanar line (130) terminated in a region sandwiched by the first post wall waveguide (120) and the second post wall waveguide (140) is formed.SELECTED DRAWING: Figure 1

Description

The present invention relates to structures that can be used as diplexers or dividers.

In wireless communication equipment and radar equipment that adopt the FDD (Frequency Division Duplex) method, high-frequency signals such as microwaves and millimeter waves are transmitted and received while one antenna circuit is shared by the transmission circuit and the reception circuit. Is required. Diplexers are used to meet this demand.

The diplexer is a conversion unit that is an interface for connecting a transmission circuit, a reception circuit, and an antenna circuit, a directional coupling unit that connects one waveguide and the other waveguide, and a frequency band of a high-frequency signal to be transmitted. It is composed of a filter that identifies.

For example, Figure 18.35 of Non-Patent Document 1 shows (1) a filter pair consisting of two bandpass filters arranged in parallel (Rx filter shown in Figure 18.35) and (2) one side of the filter pair. The first directional junction (90 ° hybrid as shown in Figure 18.35) located in (3) and the second directional junction (as shown in Figure 18.35) located on the other side of the filter pair. 90 ° hybrid) and the technology to realize the diplexer by combining with are described.

Richard J. Cameron et. Al., MICROWAVE FILTERS for COMMUNICATION SYSTEMS, p.661-P.663, 2007 John Wiley & Sons, Inc.

However, the conventional diplexer described in Figure 18.35 of Non-Patent Document 1 is configured by arranging the first directional coupling portion, the filter pair, and the second directional coupling portion in this order. Therefore, the maximum length (hereinafter, also referred to as the total length) in a plan view must be long.

One aspect of the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to make the maximum length of a structure that can be used as a diplexer or a divider shorter than before in a plan view.

In order to solve the above problems, the structure according to the first aspect of the present invention includes a first conductor layer, a first dielectric layer, a second conductor layer, a second dielectric layer, and a third conductor layer. A first structure in which the structures are laminated in this order, the first dielectric layer includes a first resonator group composed of a plurality of electromagnetically coupled resonators, and has a first passage band. A first post wall is formed in which the post-wall waveguide is formed together with the first conductor layer and the second conductor layer, and the second dielectric layer is composed of a plurality of electromagnetically coupled resonators. A second post wall waveguide that includes a second resonator group and has a second pass band, and at least a part of which overlaps with at least a part of the first post wall waveguide in a plan view. A second post wall forming the waveguide together with the second conductor layer and the third conductor layer is formed, and the first post wall waveguide and the second post wall waveguide are formed in the second conductor layer. A coplanar line terminating in the region sandwiched between and is formed.

According to the above configuration, the electromagnetic wave transmitted by the coplanar line can be input to both the first post wall waveguide and the second post wall waveguide. Alternatively, the electromagnetic wave transmitted through the first post wall waveguide and the electromagnetic wave transmitted through the second post wall waveguide can be input to the coplanar line. In addition, since the present structure only includes a first post wall waveguide and a second post wall waveguide in which at least a part of the overlap is provided, and a coplanar line, the structure is compared with the diplexer described in Non-Patent Document 1. , The maximum length in a plan view can be shortened.

Further, according to the above configuration, the first post-wall waveguide functions as a bandpass filter having a first passband, and the second post-wall waveguide functions as a bandpass filter having a second passband. .. Therefore, the structure can combine or demultiplex the waveguide modes with frequencies included in different bands.

In the structure according to the second aspect of the present invention, in the first aspect described above, the capacitance between the strip conductor of the coplanar line and the ground conductor of the coplanar line is the capacitance between the strip conductor and the first aspect. A configuration that is larger than the capacitance between the conductor layer and the capacitance between the strip conductor and the third conductor layer is adopted.

According to the above configuration, the strip conductor is not as a signal line of a microstrip line realized with at least one of the first conductor layer and the third conductor layer, but as a signal line of a coplanar line realized with a ground conductor. Can function as. Further, according to the above configuration, the distance between the second conductor layer and the first conductor layer and the distance between the second conductor layer and the third conductor layer can be set wide, so that the first post wall guide can be set. The transmission characteristics of the waveguide and the second post wall waveguide can be improved.

In the structure according to the third aspect of the present invention, in the first aspect or the second aspect described above, one of the pair of voids between the strip conductor of the coplanar line and the ground conductor of the coplanar line is At the end point of the coplanar line, it is bent in the first direction orthogonal to the extending direction of the coplanar line, and the other of the pair of voids is bent in the second direction opposite to the first direction at the end point. The configuration is adopted.

According to the above configuration, the conversion efficiency from the waveguide mode in which the coplanar line is waveguide to the waveguide mode in which the first post wall waveguide is guided, and the induction in which the coplanar line is guided. It is possible to improve the conversion efficiency from the wave mode to the waveguide mode in which the second post wall waveguide is guided.

In the structure according to the fourth aspect of the present invention, in the third aspect described above, the length of the portion extending in the first direction from the bent portion of one of the pair of voids is the pair. A configuration is adopted that is equal to the length of the portion extending in the second direction from the bent portion of the other of the voids.

According to the above configuration, the conversion efficiency from the waveguide mode in which the coplanar line is waveguide to the waveguide mode in which the first post wall waveguide is guided, and the induction in which the coplanar line is guided. The conversion efficiency from the wave mode to the waveguide mode in which the second post wall waveguide is guided can be further improved.

In the structure according to the fifth aspect of the present invention, in the third aspect or the fourth aspect described above, the vicinity of one tip of the pair of voids is bent from the first direction to the direction along the extending direction. The vicinity of the other tip of the pair of voids is bent in a direction along the stretching direction from the second direction.

According to the above configuration, the coplanar line and the first post wall waveguide can be obtained by changing the design of the length near the tip of one gap and the length near the tip of the other gap in the pair of gaps. And the amount of coupling with the second post wall waveguide can be changed.

In the fifth aspect described above, the structure according to the sixth aspect of the present invention is based on the shortest distance from the end point of the coplanar line to the short wall of the first post wall waveguide and the end point. The configuration is different from the shortest distance to the short wall of the second post wall waveguide.

The shortest distance from the end of the coplanar line to the short wall of the first post wall waveguide affects the impedance matching between the coplanar line and the first post wall waveguide. Further, the shortest distance from the end point of the coplanar line to the short wall of the second post wall waveguide affects the impedance matching between the coplanar line and the second post wall waveguide.

When waveguideing in a waveguide mode in which each of the first post-wall waveguide and the second post-wall waveguide has frequencies contained in different bands, the coplanar can be set by setting each of the two shortest distances described above independently. Impedance matching between the line and the first post wall waveguide and impedance matching between the coplanar line and the second post wall waveguide can be enhanced.

The structure according to the seventh aspect of the present invention is the structure of the coplanar line among the plurality of resonators included in the first post wall waveguide in any of the first to sixth aspects described above. The resonator closest to the end point is configured to overlap in plan view with the resonator closest to the end point of the coplanar line among the plurality of resonators included in the second post wall waveguide.

According to the above configuration, the relative positional relationship between the coplanar line and the first post wall waveguide can be made similar to the relative positional relationship between the coplanar line and the second post wall waveguide. Therefore, the conversion efficiency from the waveguide mode in which the coplanar line is waveguide to the waveguide mode in which the first post-wall waveguide is waveguideed, and the waveguide mode in which the coplanar line is waveguideed to the first. The conversion efficiency of the two-post wall waveguide to the waveguide mode can be made similar.

The structure according to the eighth aspect of the present invention has a configuration in which the second pass band is a pass band different from the first pass band in any of the first to seventh aspects described above. It is adopted.

According to the above configuration, the structure according to the eighth aspect operates as a diplexer.

According to one aspect of the present invention, in a structure that can be used as a diplexer or a divider, the maximum length in a plan view can be made shorter than before.

It is an exploded perspective view of the structure which concerns on one Embodiment of this invention. It is a plan view of the structure shown in FIG. 1, and is an enlarged plan view near the end point of a coplanar line. It is sectional drawing of the structure shown in FIG. It is a graph which shows the reflection characteristic and the transmission characteristic in the structure shown in FIG.

Hereinafter, the structure 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is an exploded perspective view of the structure 1. FIG. 2 is a plan view of the structure 1 and is an enlarged plan view of the vicinity of the end point Pt of the coplanar line 130. FIG. 3 is a cross-sectional view of the structure 1 and is a cross-sectional view taken along the line AA'shown in FIG.

[Structure of structure 1]
As shown in FIG. 1, the structure 1 includes a first conductor layer 11, a first dielectric layer 12, a second conductor layer 13, a second dielectric layer 14, a third conductor layer 15, and a second conductor layer 1. It includes a 1-post wall 121 and a second post wall 141.

In the structure 1, each of the first conductor layer 11, the first dielectric layer 12, the second conductor layer 13, the second dielectric layer 14, and the third conductor layer 15 are laminated in this order.

The conductor constituting each of the first conductor layer 11, the second conductor layer 13, and the third conductor layer 15 is not limited, but is preferably a metal having high conductivity such as copper, aluminum, and an aluminum alloy. .. In the present embodiment, the first conductor layer 11, the second conductor layer 13, and the third conductor layer 15 are made of copper. Further, the thicknesses of the first conductor layer 11, the second conductor layer 13, and the third conductor layer 15 are not limited and can be appropriately determined.

The dielectric constituting each of the first dielectric layer 12 and the second dielectric layer 14 is not limited, but is preferably a dielectric having a small high frequency loss, such as quartz glass or a liquid crystal polymer. In the present embodiment, the first dielectric layer 12 and the second dielectric layer 14 are made of quartz glass. Further, the thicknesses of the first dielectric layer 12 and the second dielectric layer 14 are not limited and can be appropriately determined.

<First post wall waveguide 120>
The first post wall 121 is a group of conductor posts composed of n conductor posts 121i formed inside the first dielectric layer 12. Here, n is an arbitrary positive integer, and i is an integer of 1 ≦ i ≦ n. Each conductor post 121i is arranged in a fence shape so as to have a predetermined shape when the first dielectric layer 12 is viewed in a plan view. In this embodiment, the predetermined shape is rectangular. The conductor post 121i penetrates from one main surface of the first dielectric layer 12 to the other main surface. Therefore, the first conductor layer 11 and the second conductor layer 13 are short-circuited by the conductor post 121i.

In the present embodiment, each conductor post 121i forms n through holes at predetermined positions of the first dielectric layer 12, and then forms a conductor film on the inner wall of each of the through holes. Obtained (see FIG. 3). However, each conductor post 121i is not limited to the conductor film formed in this way, and may be composed of conductors filled in each of the through holes.

The distance between the conductor posts 121i and the conductor posts 121i + 1 adjacent to each other is the first with respect to the waveguide mode having a frequency included in a predetermined band (for example, an 82.5 GHz band having a center frequency near 82.5 GHz). It can be appropriately determined within the range in which the 1-post wall 121 functions as a virtual conductor wall. Further, the diameter of each conductor post 121i can be appropriately determined.

The first post wall 121 functions as a virtual conductor wall, and together with the first conductor layer 11 and the second conductor layer 13, constitutes the first post wall waveguide 120. That is, the first post wall 121 constitutes a narrow wall of the first post wall waveguide 120, and the first conductor layer 11 and the second conductor layer 13 form a pair of wide walls of the first post wall waveguide 120. To do.

Of the narrow walls realized by the first post wall 121 arranged in a rectangular shape as described above, the virtual conductor wall of the portion corresponding to the short side of the rectangular shape is referred to as a short wall. The AA'line shown in FIG. 2 is a straight line passing through the centers of the six conductor posts 121i forming the short wall of the first post wall waveguide 120.

The waveguide region of the first post-wall waveguide 120 is formed inside the first dielectric layer 12. In other words, the waveguide region of the first post wall waveguide 120 is a region surrounded by the first post wall 121 when the first conductor layer 11 is viewed in a plan view.

The first post wall waveguide 120 includes a first resonator group consisting of N resonators, and adjacent resonators are electromagnetically coupled to each other through a coupling window. FIG. 1 shows only the resonator 1201 which is the first-stage resonator and the resonator 1202 which is the second-stage resonator among the N resonators, and the third-stage to N-stage resonators are shown. The resonator is not shown. The first post wall waveguide 120 configured in this way functions as a resonator-coupled bandpass filter. The first pass band, which is the pass band of the first post wall waveguide 120, is not limited and can be appropriately determined. In the present embodiment, the first pass band is the 82.5 GHz band.

<Second post wall waveguide 140>
The second post wall 141 is a group of conductor posts composed of m conductor posts 141j formed inside the second dielectric layer 14. Here, m is an arbitrary positive integer, and j is an integer of 1 ≦ j ≦ m. Each conductor post 141j is arranged in a fence shape so as to have a predetermined shape (rectangular shape in the present embodiment) when the second dielectric layer 14 is viewed in a plan view.

The second post wall 141 functions as a virtual conductor wall, and together with the second conductor layer 13 and the third conductor layer 15, constitutes the second post wall waveguide 140. That is, the second post wall 141 constitutes a narrow wall of the second post wall waveguide 140, and the second conductor layer 13 and the third conductor layer 15 form a pair of wide walls of the second post wall waveguide 140. To do. The second conductor layer 13 is a wide wall common to the first post wall waveguide 120 and the second post wall waveguide 140.

Of the narrow walls realized by the second post wall 141 arranged in a rectangular shape, the virtual conductor wall of the portion corresponding to the short side of the rectangular shape is referred to as a short wall.

The short wall of the second post wall waveguide 140 and the short wall of the first post wall waveguide 120 were viewed along the long axis direction of the waveguide region (the same direction as the stretching direction shown in FIG. 2). In some cases, they may be provided at the same position or may be provided at different positions. In the present embodiment, the short wall of the second post wall waveguide 140 and the short wall of the first post wall waveguide 120 are provided at different positions.

The second post wall 141 is configured in the same manner as the first post wall 121, except that it is formed inside the second dielectric layer 14 instead of the first dielectric layer 12. Therefore, in the present embodiment, the detailed description of the second post wall 141 will be omitted.

Further, the waveguide region of the second post-wall waveguide 140 is formed not inside the first dielectric layer 12 but inside the second dielectric layer 14. In other words, the waveguide region of the second post wall waveguide 140 is a region surrounded by the second post wall 141 when the third conductor layer 15 is viewed in a plan view. Except for this point, the second post wall waveguide 140 is configured in the same manner as the first post wall waveguide 120. That is, the second post wall waveguide 140 includes a second resonator group composed of M resonators, and adjacent resonators are electromagnetically coupled to each other through a coupling window. FIG. 1 shows only the resonator 1401 which is the first-stage resonator and the resonator 1402 which is the second-stage resonator among the M resonators, and the third-stage to M-stage resonators are shown. The resonator is not shown. The second post wall waveguide 140 configured in this way functions as a resonator-coupled bandpass filter. The second pass band, which is the pass band of the second post wall waveguide 140, is a 72.5 GHz band having a center frequency near 72.5 GHz. In the present embodiment, the second pass band is a pass band different from the first pass band. However, in the structure 1, the second pass band may be the same pass band as the first pass band. In this case, the structure 1 functions as a divider capable of combining or demultiplexing electromagnetic waves included in the same pass band.
Further, the number of stages N of the resonator in the first post wall waveguide 120 and the number of stages M of the resonator in the second post wall waveguide 140 may be the same or different. In this embodiment, N = M = 5.

<Arrangement of the first post wall waveguide 120 and the second post wall waveguide 140>
As shown in FIG. 2, when the third conductor layer 15 is viewed in a plan view, the waveguide region of the first post wall waveguide 120 is included in the waveguide region of the second post wall waveguide 140. However, the arrangement of the first post wall waveguide 120 and the second post wall waveguide 140 is not limited to this. In the plan view of the first post wall waveguide 120 and the second post wall waveguide 140, at least a part of the first post wall waveguide 120 and a part of the second post wall waveguide 140 overlap each other. It is preferable that the resonator 1201 and the resonator 1401 which are the first-stage resonators of each overlap each other, and the first post wall waveguide 120 and the second post wall guide are as in the present embodiment. It is more preferable that the waveguide 140 substantially overlaps with the waveguide 140.

<Function of structure 1>
As described above, each of the first post-wall waveguide 120 and the second post-wall waveguide 140 functions as a resonator-coupled bandpass filter having different pass bands. The structure 1 configured in this way can combine or demultiplex the waveguide modes having frequencies included in different bands.

<Coplanar line 130>
As shown in FIG. 1, the second conductor layer 13 is formed with a pair of voids 134 and 135. Each of the voids 134 and the void 135 can be said to be a groove from one main surface of the second conductor layer 13 to the other main surface.

Since the voids 134 and 135 are formed in the second conductor layer 13, a part of the second conductor layer 13 is divided into three regions. In the following, in the second conductor layer 13, the region sandwiched between the gap 134 and the gap 135 is referred to as a strip conductor 131, and each of the regions sandwiching the strip conductor 131 is referred to as a ground conductor 132 and a ground conductor 133, respectively. ..

The strip conductor 131, the ground conductor 132, and the ground conductor 133 configured in this way form the coplanar line 130. The coplanar line 130 is formed in a region sandwiched between the first post wall waveguide 120 and the second post wall waveguide 140. Further, as shown in FIG. 2, the coplanar line 130 crosses the short walls of the first post wall waveguide 120 and the second post wall waveguide 140 when the third conductor layer 15 is viewed in a plan view. It is stretched. Hereinafter, the direction in which the strip conductor 131 is stretched is referred to as a stretching direction (see FIG. 2). Therefore, the end point Pt of the coplanar line 130 is located inside each waveguide region of the first post wall waveguide 120 and the second post wall waveguide 140 in a plan view. That is, the coplanar line 130 is terminated in a region sandwiched between the first post wall waveguide 120 and the second post wall waveguide 140.

According to this configuration, the electromagnetic wave transmitted by the coplanar line 130 can be input to both the first post wall waveguide 120 and the second post wall waveguide 140. Alternatively, the electromagnetic wave transmitted through the first post wall waveguide 120 and the electromagnetic wave transmitted through the second post wall waveguide 140 can be input to the coplanar line 130. Therefore, the structure 1 functions as a diplexer. Further, since the structure 1 only includes the first post wall waveguide 120 and the second post wall waveguide 140 and the coplanar line 130 in which at least a part of the structure overlaps, the diplexer described in Non-Patent Document 1 is used. In comparison, the maximum length in a plan view can be shortened.

As in the present embodiment, in a plan view, one post wall waveguide (first post wall waveguide 120 in the present embodiment) is the other post wall waveguide (second post wall guide in the present embodiment). It is preferably included in the waveguide 140).

According to this configuration, since most of the first post wall waveguide 120 and the second post wall waveguide 140 overlap each other in the plan view, the maximum length of the structure 1 in the plan view is further shortened. can do.

Further, in the present embodiment, the first post wall waveguide 120 is composed of a single-layer first dielectric layer 12, a first conductor layer 11 sandwiching the first dielectric layer 12, and a second conductor layer 13. That is, the resonators 1201 to 1205 included in the first post wall waveguide 120 are arranged in a plane in the same layer. However, in one embodiment of the present invention, one modification of the first post-wall waveguide 120 is configured by laminating a plurality of dielectric layers and a pair of conductor layers sandwiching each dielectric layer, and , Each of the resonators 1201 to 1205 may be arranged in any of the above-mentioned plurality of dielectric layers. That is, some of the resonators 1201 to 1205 may be arranged in a stacked manner. At this time, it is preferable that the front portion of the resonators 1201 to 1205 (for example, the resonators 1201 to 1203) and the rear portion of the resonators 1201 to 1205 (for example, the resonators 1204 and 1205) overlap each other in a plan view. According to this configuration, while the first post wall waveguide 120 functions as a resonator-coupled bandpass filter, the resonators 1201 to 1205 can be arranged in an overlapping manner, so that the first post can be arranged in a plan view. The maximum length of the wall waveguide 120 can be shortened.

The same applies to the resonators 1401 to 1405 included in the second post wall waveguide 140.

By configuring the first post wall waveguide 120 and the second post wall waveguide 140 in this way, the maximum length of the structure 1 in a plan view can be further shortened.

As shown in FIG. 1, the widths of the voids 134 and 135 (the lengths in the directions orthogonal to the stretching direction) are the thicknesses of the first dielectric layer 12 and the second dielectric layer 14, respectively. Is significantly below. Therefore, the capacitance generated between the strip conductor 131 and each of the ground conductors 132 and 133 includes the capacitance generated between the strip conductor 131 and the first conductor layer 11 and the strip conductor 131. It is larger than the capacitance generated between the third conductor layer 15 and the third conductor layer 15.

According to this configuration, the strip conductor 131 is realized together with the ground conductors 132, 133, not as a signal line of a microstrip line realized with at least one of the first conductor layer 11 and the third conductor layer 15. It can function as a signal line for a coplanar line. Further, according to this configuration, the distance between the second conductor layer 13 and the first conductor layer 11 (that is, the thickness of the first dielectric layer 12), and the distance between the second conductor layer 13 and the third conductor layer 15 Since the interval (that is, the thickness of the second dielectric layer 14) can be set widely, the transmission characteristics of the first post wall waveguide 120 and the second post wall waveguide 140 can be improved.

The gap 134 is bent at the end point Pt in the first direction orthogonal to the stretching direction. The gap 135 is bent at the end point Pt in the second direction orthogonal to the stretching direction and in the second direction opposite to the first direction.

According to this configuration, the conversion efficiency from the waveguide mode in which the coplanar line 130 is guided to the waveguide mode in which the first post wall waveguide 120 is waveguideed, and the waveguide in which the coplanar line 130 is guided are provided. It is possible to improve the conversion efficiency from the mode to the waveguide mode in which the second post wall waveguide 140 is guided.

In addition, the length L1 of the portion of the gap 134 extending in the first direction from the bent portion Pt is the length of the portion of the void 135 extending in the second direction from the bent portion Pt. Is equal to L2. That is, each of the voids 134 and 135 is formed so as to be axisymmetric with a straight line parallel to the stretching direction and passing through the middle of each as an axis of symmetry.

According to this configuration, the conversion efficiency from the waveguide mode in which the coplanar line 130 is guided to the waveguide mode in which the first post wall waveguide 120 is waveguideed, and the waveguide in which the coplanar line 130 is guided are provided. The conversion efficiency from the mode to the waveguide mode in which the second post wall waveguide 140 is guided can be further improved.

Further, the vicinity of the tip of the gap 134 is bent from the first direction in the direction along the stretching direction, and the vicinity of the tip of the gap 135 is bent in the direction along the stretching direction from the second direction.

According to the above configuration, the coplanar line 130, the first post wall waveguide 120, and the second post wall are redesigned by redesigning the length L3 near the tip of the gap 134 and the length L4 near the tip of the gap 135. The amount of coupling with the waveguide 140 can be changed. In this embodiment, the length L3 and the length L4 are equal. However, in one aspect of the present invention, the length L3 and the length L4 may be different.

Further, as described above, the pass band when functioning as a bandpass filter is different in each of the first post wall waveguide 120 and the second post wall waveguide 140. In this case, as in the present embodiment, the shortest distance from the end point Pt to the short wall of the first post wall waveguide 120 (hereinafter referred to as the first shortest distance) and the second post from the end point Pt. It is preferable that the shortest distance to the short wall of the wall waveguide 140 (hereinafter, referred to as the second shortest distance) is different from each other.

The first shortest distance affects impedance matching between the coplanar line 130 and the first post wall waveguide 120. The second shortest distance also affects the impedance matching between the coplanar line 130 and the second post wall waveguide 140.

When the pass bands of the first post wall waveguide 120 and the second post wall waveguide 140 are different, the first shortest distance and the second shortest distance can be set independently, so that the coplanar line 130 and the first post can be set independently. Impedance matching between the wall waveguide 120 and the impedance matching between the coplanar line 130 and the second post wall waveguide 140 can be enhanced. That is, the conversion efficiency from the waveguide mode in which the coplanar line 130 is guided to the waveguide mode in which the first post-wall waveguide 120 is waveguideed, and the waveguide mode in which the coplanar line 130 is guided to the second mode. The conversion efficiency of the post-wall waveguide 140 into a waveguide mode can be further improved.

Further, among the plurality of resonators 1201 to 120N included in the first post wall waveguide 120, the resonator 1201 which is the resonator closest to the end point Pt has a plurality of resonances included in the second post wall waveguide 140. Of the units 1401 to 140M, it is preferable that they overlap with the resonator 1401 which is the resonator closest to the end point Pt in a plan view.

In other words, each of the resonator 1201 and the resonator 1401 is a surface parallel to each of the pair of main surfaces of the second conductor layer 13, and a surface located in the middle of the pair of main surfaces. It is preferable that the plane of symmetry is configured to be substantially mirror-symmetrical.

According to this configuration, the relative positional relationship between the coplanar line 130 and the first post wall waveguide 120 and the relative positional relationship between the coplanar line 130 and the second post wall waveguide 140 are made similar. Can be done. Therefore, the conversion efficiency from the waveguide mode in which the coplanar line 130 is waveguideed to the waveguide mode in which the first post-wall waveguide 120 is waveguideed, and the waveguide mode in which the coplanar line 130 is waveguideed to the second The conversion efficiency of the post-wall waveguide 140 to the waveguide mode can be made similar. That is, the distribution ratio in the diplexer can be brought close to 1: 1.

[Reflection and transmission characteristics]
The reflection characteristics and transmission characteristics of the structure 1 shown in FIGS. 1 to 3 will be described with reference to FIG. FIG. 4 is a graph showing the simulation results of the reflection characteristics and the transmission characteristics in the structure 1 of this embodiment. In the structure 1, the end of the coplanar line 130 opposite to the end point Pt is defined as the first port, and the fifth-stage resonator 1205 of the first post wall waveguide 120 is defined as the second port. The fifth stage resonator 1405 of the two-post wall waveguide 140 was defined as the third port. In such a port arrangement, the frequency dependence of the S parameter S11 is referred to as a reflection characteristic, and the frequency dependence of the S parameter S21 and the S parameter S31 is referred to as a transmission characteristic.

With reference to FIG. 4, it was found that the S parameter S11 was -10 dB or less in each of the pass band of the first post wall waveguide 120 and the pass band of the second post wall waveguide 140. Further, it was found that the isolation, which is the difference between the S parameter S21 and the S parameter S31, is 50 dB or more in both the 72.5 GHz band and the 82.5 GHz band.

[Additional notes]
The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims, and the embodiment obtained by appropriately combining the technical means disclosed in each embodiment is also available. It is included in the technical scope of the present invention.

1 Structure 11 1st conductor layer 12 1st dielectric layer 13 2nd conductor layer 14 2nd dielectric layer 15 3rd conductor layer 120 1st post wall waveguide 1201-120N Resonator 121 1st post wall 121i Conductor post 130 Coplanar Line Pt Termination Point 131 Strip Conductor 132, 133 Ground Conductor 134, 135 Void 140 Second Post Wall Dielectric Path 1401-140M Resonator 141 Second Post Wall 141j Conductor Post

Claims (8)

A structure in which a first conductor layer, a first dielectric layer, a second conductor layer, a second dielectric layer, and a third conductor layer are laminated in this order.
The first dielectric layer includes a first resonator group composed of a plurality of electromagnetically coupled resonators, and has a first post-wall waveguide having a first pass band, and the first conductor layer. And the first post wall formed together with the second conductor layer is formed.
The second dielectric layer is a second post-wall waveguide containing a second resonator group composed of a plurality of electromagnetically coupled resonators and having a second pass band, at least a part thereof. A second post wall is formed in which a second post wall waveguide that overlaps with at least a part of the first post wall waveguide in a plan view is formed together with the second conductor layer and the third conductor layer.
In the second conductor layer, a coplanar line terminating in a region sandwiched between the first post wall waveguide and the second post wall waveguide is formed.
A structure characterized by that. The capacitance between the strip conductor of the coplanar line and the ground conductor of the coplanar line is the capacitance between the strip conductor and the first conductor layer, and the capacitance between the strip conductor and the third conductor layer. Greater than the capacitance between
The structure according to claim 1. One of the pair of voids between the strip conductor of the coplanar line and the ground conductor of the coplanar line is bent in the first direction orthogonal to the extending direction of the coplanar line at the end point of the coplanar line, and the pair is bent. The other side of the void is bent in the second direction, which is the opposite direction of the first direction, at the end point.
The structure according to claim 1 or 2. The length of the portion of one of the pair of voids extending in the first direction from the bent portion is the length of the portion of the other of the pair of voids extending in the second direction from the bent portion. be equivalent to,
The structure according to claim 3. The vicinity of one tip of the pair of voids is bent from the first direction in the direction along the stretching direction, and the vicinity of the other tip of the pair of voids is in the direction from the second direction along the stretching direction. Bent,
The structure according to claim 3 or 4. The shortest distance from the end point of the coplanar line to the short wall of the first post wall waveguide and the shortest distance from the end point to the short wall of the second post wall waveguide are different from each other. ,
The structure according to claim 5. Of the plurality of resonators included in the first post wall waveguide, the resonator closest to the end point of the coplanar line is the coplanar line among the plurality of resonators included in the second post wall waveguide. Overlaps in plan view with the resonator closest to the end point of
The structure according to any one of claims 1 to 6, wherein the structure is characterized by the above. The second pass band is a pass band different from the first pass band.
The structure according to any one of claims 1 to 7.

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