JP6905608B2 - Post wall waveguide and filter module - Google Patents

Description

The present invention relates to post-wall waveguides and filter modules.

The post-wall waveguide having a filter function represented by a bandpass filter includes a dielectric substrate, a first wide wall and a second wide wall formed on each of the pair of main surfaces of the substrate, and the above. It has a post wall formed inside the substrate.

The first wide wall, the second wide wall, and the post wall constitute a plurality of resonance regions, and a first excitation region and a second excitation region sandwiching the plurality of resonance regions.

Post-wall waveguides exhibit better filter characteristics than filter circuits built into integrated circuits when filtering high frequency signals processed by integrated circuits (ICs) for wireless communication. This is because the post-wall waveguide has a higher no-load Q than the filter circuit. Therefore, there is an increasing demand for connecting the post wall waveguide and the IC.

In each of the first excitation region and the second excitation region of the post-wall waveguide described in Non-Patent Document 1, the first excitation pin for exciting the first excitation region and the second excitation region for exciting the second excitation region are excited, respectively. 2 Excitation pins are provided. Further, in the post-wall waveguide described in Non-Patent Document 1, the resonance region of 6 stages is divided into a first half portion (1st stage to 3rd stage) and a latter half portion (4th stage to 6th stage). By extending the first half portion and the second half portion in opposite directions, the distance between the first excitation pin and the second excitation pin is shortened.

However, in many cases, the distance between the first excitation pin and the second excitation pin is longer than the distance between the output terminal and the input terminal of the IC. In such a case, in order to mount the IC on the post wall waveguide, a first line connecting the first excitation pin and the output terminal and a second line connecting the second excitation pin and the input terminal are separately provided. become. Examples of the first line and the second line include a microstrip line, which is an example of a two-conductor line.

The transmission loss in a two-conductor line is often higher than the transmission loss in a post-wall waveguide.

Yusuke Uemichi, et. Al, A 60-GHZ SIX-POLE QUASI-ELLIPTIC BANDPASS FILTER WITH NOVEL FEEDING MECHANISMS BASED ON SILICA-BASED POST-WALL WAVEGUIDE, IEEE MTT-S IMS, June 2017.

In the post-wall waveguide described in Non-Patent Document 1, since the distance between the first excitation pin and the second excitation pin is relatively short, the lengths of the first line and the second line can be shortened, and the transmission loss can be suppressed.

On the other hand, regarding the distance between the first excitation pin and the second excitation pin, in addition to the request for shortening this distance, there is also a request for facilitating the design change of this distance. This is because the distance between the output terminal and the input terminal varies due to the variety of types of ICs mounted on the surface of the post-wall waveguide.

In the post-wall waveguide described in Non-Patent Document 1, since the degree of freedom for changing the position of each resonance region is low, it is difficult to change the design of the position of each resonance region. As a result, the first excitation pin and the first excitation pin and the first excitation pin are used. 2 It is difficult to change the design of the distance to the excitation pin.

One aspect of the present invention has been made in view of the above-mentioned problems, and an object thereof is provided in each excitation region in a post-wall waveguide including a plurality of resonance regions and two excitation regions sandwiching them. It is an object of the present invention to provide a post-wall waveguide in which the distance between the first excitation unit and the second excitation unit is not longer than before, and the distance can be easily redesigned.

In order to solve the above problems, the post-wall waveguide according to the first aspect of the present invention includes a dielectric substrate, a first wide wall formed on each of the pair of main surfaces of the substrate, and the like. A second wide wall and a post wall formed inside the substrate are provided, and the first wide wall, the second wide wall, and the post wall are connected in series to a plurality of resonance regions. And a first excitation region adjacent to the resonance region of the first stage and a second excitation region adjacent to the resonance region of the last stage. When the post-wall waveguide is viewed in a plan view, each of the plurality of resonance regions has a circular shape, and each of the two resonance regions adjacent to each other among the plurality of resonance regions has these two resonances. When the respective radii of the regions are r ₁ and r _2, and the distance between the centers of these two resonance regions is D ₁₂ , _{they are arranged so that D 12} <r ₁ + r ₂ and the first excitation is described above. The distance between the excitation units, which is the distance between the first excitation unit provided in the region and the second excitation unit provided in the second excitation region, is the center of the resonance region of the first stage and the resonance region of the last stage. It is less than or equal to the distance.

This post wall waveguide having a plurality of resonance regions functions as a bandpass filter. According to the above configuration, the distance between the excitation portions can be shortened to the same level as or less than that of the post-wall waveguide described in Non-Patent Document 1. On top of that, according to the above configuration, since the shape of each resonance region is circular when viewed in a plan view, even if the design of the distance between the excitation parts is changed, the distance between the excitation parts after the design deformation is obtained. Therefore, the position of each resonance region can be easily optimized. Therefore, in this post wall waveguide, the distance between the excitation portions can be easily changed without increasing the distance between the excitation portions as compared with the conventional one.

Further, in the post-wall waveguide according to the second aspect of the present invention, in the first aspect described above, at least one of the first excitation section and the second excitation section is the resonance region of the first stage and the last stage. It is configured to be located between the resonance region of the.

According to the above configuration, the distance between the excitation units can be further shortened.

Further, in the post-wall waveguide according to the third aspect of the present invention, in the first aspect or the second aspect described above, the portion of the first wide wall corresponding to the first excitation region has a first anti. A pad is formed, and the first excitation portion is a first excitation pin extending from the first conductor pad surrounded by the first anti-pad to the inside of the first excitation region, and is a first excitation pin of the first wide wall. A second anti-pad is formed in a portion corresponding to the second excitation region, and the second excitation portion is located inside the second excitation region from the second conductor pad surrounded by the second anti-pad. It is configured to be the second excitation pin to reach.

According to the above configuration, the first excitation pin, which is an aspect of the first excitation unit, and the second excitation pin, which is an aspect of the second excitation unit, each have a first excitation region and a second excitation region, respectively. Can be excited. Therefore, it is possible to suppress the transmission loss that may occur when the electromagnetic wave is transmitted between the first excitation unit and the second excitation unit.

Further, in the post-wall waveguide according to the fourth aspect of the present invention, in the third aspect described above, one end of the post-wall waveguide is conductive to the first conductor pad, and the post-wall waveguide is a two-conductor line together with the first wide wall. A first strip-shaped conductor constituting the above, and a second strip-shaped conductor having one end conducting to the second conductor pad and forming a two-conductor line together with the first wide wall are further provided.

According to the above configuration, by appropriately designing the wiring patterns of the first band-shaped conductor and the second band-shaped conductor, for example, the output terminal of the integrated circuit is connected to the other end of the first band-shaped conductor, and the second band-shaped conductor is formed. The input terminal of the integrated circuit can be easily connected to the other end of the conductor. Further, as described above, since the distance between the excitation portions is shorter than in the conventional post wall waveguide, the lengths of the first band-shaped conductor and the second band-shaped conductor can be shortened as compared with the conventional one. Since the transmission loss in the two-conductor line is often higher than the transmission loss in the post-wall waveguide, the post-wall waveguide can suppress the transmission loss when an integrated circuit is mounted.

Further, in the first aspect or the second aspect described above, the post-wall waveguide according to the fifth aspect of the present invention has a first opening in a portion of the first wide wall corresponding to the first excitation region. Is formed, and a second opening is formed in a portion of the first wide wall corresponding to the second excitation region, and a first strip-shaped conductor provided apart from the first wide wall. Therefore, when viewed in a plan view, the first band-shaped conductor in which a part thereof overlaps with at least a part of the first opening and the second band-shaped conductor provided apart from the first wide wall. Further, when viewed in a plan view, a second strip-shaped conductor in which a part thereof overlaps with at least a part of the second opening is further provided, and the first exciting portion is the first of the first strip-shaped conductors. It is a portion that overlaps with one opening, and the second excitation portion is configured to be a portion of the second strip-shaped conductor that overlaps with the second opening.

According to the above configuration, the portion of the first strip-shaped conductor that overlaps with the first opening, which is one aspect of the first excitation portion, and the second strip-shaped conductor, which is one aspect of the second excitation portion. Each of the portions overlapping the second opening can excite the first excitation region and the second excitation region, respectively. Therefore, it is possible to suppress the transmission loss that may occur when the electromagnetic wave is transmitted between the first excitation unit and the second excitation unit. Further, according to the above configuration, each of the first excitation unit and the second excitation unit can excite each of the first excitation region and the second excitation region without using the excitation pin. Therefore, since each of the first strip-shaped conductor and the second strip-shaped conductor is not fixed to the first excitation region and the second excitation region via the excitation pins, transmission defects due to changes in the environmental temperature are caused. It is unlikely to occur.

Further, in the post-wall waveguide according to the sixth aspect of the present invention, in the above-described fifth aspect, the first band-shaped conductor constitutes a two-conductor line together with the first wide wall, and the second band-shaped conductor is A two-conductor line is formed together with the first wide wall.

According to the above configuration, by appropriately designing the wiring patterns of the first band-shaped conductor and the second band-shaped conductor, for example, the output terminal of the integrated circuit is connected to one end of the first band-shaped conductor, and the second band-shaped conductor is formed. The input terminal of the integrated circuit can be easily connected to one end of the conductor. Further, as described above, since the distance between the excitation portions is shorter than in the conventional post wall waveguide, the lengths of the first band-shaped conductor and the second band-shaped conductor can be shortened as compared with the conventional one. Since the transmission loss in the two-conductor line is often higher than the transmission loss in the post-wall waveguide, the post-wall waveguide can suppress the transmission loss when an integrated circuit is mounted.

Further, in the post-wall waveguide according to the seventh aspect of the present invention, when viewed in a plan view in the above-described aspect 5 or 6, the pair of narrow walls constituting the first excitation region are parallel to each other. Moreover, the straight line, which is a set of points that bisect the width of the first excitation region, and the central axis of the first strip-shaped conductor are deviated from each other, and the pair of narrow walls forming the second excitation region are separated from each other. Is parallel and adopts a configuration in which a straight line, which is a set of points that bisect the width of the second excitation region, and the central axis of the second strip-shaped conductor are deviated from each other.

According to the above configuration, the central axis of the first strip-shaped conductor can be provided so as to be offset from a straight line which is a set of points that bisect the width of the first excitation region. Further, the central axis of the second strip-shaped conductor can be provided so as to be offset from a straight line which is a set of points that bisect the width of the second excitation region. Therefore, this post wall waveguide can increase the degree of freedom when arranging the first band-shaped conductor and the second band-shaped conductor.

Further, in the post-wall waveguide according to the eighth aspect of the present invention, when viewed in a plan view in the above-described seventh aspect, each of the first opening and the second opening is trapezoidal, and the first opening is trapezoidal. The opening is such that the pair of bottoms forming the trapezoidal shape are parallel to each of the pair of narrow walls forming the first excitation region, and from the central axis of the first band-shaped conductor, the first The distance to the short-length bottom of the pair of bottoms of one opening is the distance from the central axis of the first strip-shaped conductor to the long-length bottom of the pair of bottoms of the first opening. The second opening is arranged so that the pair of bottoms forming the trapezoidal shape is parallel to each of the pair of narrow walls forming the second excitation region, and the above. The distance from the central axis of the second band-shaped conductor to the shorter bottom of the pair of bottoms of the second opening is from the central axis of the second band-shaped conductor to the pair of the second opening. It adopts a configuration that is arranged so that the length of the bottom exceeds the distance to the long bottom.

According to the above configuration, deterioration of reflection characteristics and transmission characteristics that may occur when the central axis of the first strip-shaped conductor is provided so as to be offset from a straight line which is a set of points that bisect the width of the first excitation region is suppressed. can do. Further, it is possible to suppress the deterioration of the reflection characteristic and the transmission characteristic that may occur when the central axis of the second strip-shaped conductor is provided so as to be offset from the straight line which is a set of points that bisect the width of the second excitation region. That is, this post-wall waveguide can suppress deterioration of reflection characteristics and transmission characteristics while increasing the degree of freedom when arranging the first band-shaped conductor and the second band-shaped conductor.

Further, the post-wall waveguide according to the ninth aspect of the present invention is the first band-shaped conductor and the first band-shaped conductor when viewed in a plan view in any of the fourth to eighth aspects described above. At least one of the angle formed by the post wall forming the first excitation region intersecting with the second excitation region and the angle formed by the second strip-shaped conductor and the post wall forming the second excitation region intersecting the second strip-shaped conductor. It is configured to be less than 45 °.

In order to solve the above problems, the filter module according to the tenth aspect of the present invention includes the post-wall waveguide according to any one of the first to ninth aspects described above and the first wide wall. The integrated circuit mounted above includes an integrated circuit in which an output terminal is connected to the first excitation unit and an input terminal is connected to the second excitation unit.

The post-wall waveguide, which realizes the filter function by electromagnetically coupling a plurality of resonance regions, exhibits good filter characteristics because the no-load Q is higher than that of the filter circuit built in the integrated circuit. According to the above configuration, when it is required to filter the high frequency signal to be processed in the integrated circuit, a post-wall waveguide having a filter function can be used instead of the filter circuit. Therefore, as compared with the filter module using the filter circuit, this filter module can obtain a good high frequency signal.

Further, when the filter module according to the eleventh aspect of the present invention is viewed in a plan view in the tenth aspect described above, the integrated circuit has at least a part of the plurality of resonance regions and the first excitation region. And it is mounted on the first wide wall so as to overlap at least a part of the second excitation region.

According to the above configuration, the filter module can be miniaturized.

According to one aspect of the present invention, it is possible to provide a post-wall waveguide whose design can be easily changed without increasing the distance between the excitation portions as compared with the conventional case.

It is a perspective view of the post wall waveguide which concerns on 1st Embodiment of this invention. Each of (a) and (b) is a plan view and a schematic view of the post-wall waveguide shown in FIG. 1, respectively. It is an enlarged cross-sectional view of the post-wall waveguide shown in FIG. 1, and is an enlarged cross-sectional view of an excitation pin and a strip-shaped conductor provided in the post-wall waveguide. Each of (a) and (b) is a schematic view of the first modification and the second modification of the post-wall waveguide shown in FIG. 1, respectively. It is an enlarged plan view of the 3rd modification of the post-wall waveguide shown in FIG. 1, and is the enlarged plan view of the opening and the strip-shaped conductor provided in the 3rd modification. FIG. 5 is an enlarged cross-sectional view of the post-wall waveguide shown in FIG. 5, which is an enlarged cross-sectional view of an opening and a strip-shaped conductor provided in the post-wall waveguide. It is an enlarged plan view of the 4th modification of the post-wall waveguide shown in FIG. 1, and is the enlarged plan view of the opening and the strip-shaped conductor provided in the 4th modification. It is a graph which shows the reflection characteristic of the post-wall waveguide which is the 1st Example group of this invention. It is a graph which shows the transmission characteristic of the post-wall waveguide which is the 1st Example group of this invention. FIG. 5 is an enlarged plan view of a fifth modification of the post-wall waveguide shown in FIG. 1, and is an enlarged plan view of an opening and a strip-shaped conductor provided in the fifth modification. It is a graph which shows the reflection characteristic of the post-wall waveguide which is the 2nd Example group of this invention. It is a graph which shows the transmission characteristic of the post-wall waveguide which is the 2nd Example group of this invention. It is a graph which shows the reflection characteristic of the post-wall waveguide which is the 3rd Example group of this invention. It is a graph which shows the transmission characteristic of the post-wall waveguide which is the 3rd Example group of this invention. It is an enlarged plan view of the filter module which concerns on 2nd Embodiment of this invention, and is the enlarged plan view of the opening and the strip-shaped conductor provided in the post-wall waveguide which constitutes the filter module which concerns on 2nd Embodiment. ..

[First Embodiment]
(Structure of post wall waveguide 1)
The configuration of the post-wall waveguide 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view of the post wall waveguide 1. Each of (a) and (b) of FIG. 2 is a plan view and a schematic view of the post wall waveguide 1. FIG. 3 is an enlarged cross-sectional view of the post-wall waveguide 1, which is an enlarged cross-sectional view of the excitation pin 6 and the strip-shaped conductor 8 included in the post-wall waveguide 1. The post-wall waveguide and filter module according to each embodiment of the present invention assume a 28 GHz band (for example, a band of 27 GHz or more and 29.5 GHz or less) as an operating band. However, in the post-wall waveguide and filter module according to one aspect of the present invention, the operating band is not limited to the 28 GHz band and can be appropriately determined. Examples of the operating band other than the 28 GHz band include a band called the E band, which is 71 GHz or more and 86 GHz or less.

As shown in FIG. 1, the post-wall waveguide 1 is formed inside a dielectric substrate 2, conductor layers 3 and 4 formed on each of the pair of main surfaces of the substrate 2, and the substrate 2. It is provided with a post wall 5 and excitation pins 6 and 7. The conductor layer 3 is an example of the first wide wall, the conductor layer 4 is an example of the second wide wall, the excitation pin 6 is an example of the first excitation unit, and the excitation pin 7 is the second excitation. This is an example of the department.

Further, as shown in FIGS. 2 and 3, the post-wall waveguide 1 includes a dielectric layer 10 formed on the surface of the conductor layer 3 and strip-shaped conductors 8 and 9 formed on the surface of the dielectric layer 10. , Is further equipped. Note that the strip-shaped conductors 8 and 9 are not shown in FIG. The strip-shaped conductors 8 and 9 will be described with reference to FIG. 3 by taking the strip-shaped conductor 8 as an example. The band-shaped conductor 8 and the conductor layer 3 _{form a microstrip line MS 1} which is an example of a two-conductor line, and the band-shaped conductor 9 and the conductor layer 3 form a _{microstrip line MS 2 which is an example of a two-conductor line.} do.

In FIG. 1, the post wall 5 and the excitation pins 6 and 7 are shown by solid lines in order to make the shapes and arrangements of the post wall 5 and the excitation pins 6 and 7 provided in the post wall waveguide 1 easy to understand. The substrate 2, the conductor layers 3 and 4, and the dielectric layer 10 are shown by virtual lines (dashed-dotted lines).

Conductor layers 3, 4 and the post wall 5, in series, and the resonance region R ₁ of the electromagnetically coupled plurality of (n, n represents an integer equal to or larger than 2, in this embodiment n = 5) configuration and to R _n, and the excitation region _{R E1} adjacent to the resonance region _{R 1} of the first stage, and the excitation region _{R E2} adjacent to the (resonance region _{R 5} in this embodiment) resonance region _{R n} of the last stage do. The excitation region _RE1 is an example of a first excitation region, and the excitation region _RE2 is an example of a second resonance region.

The post-wall waveguide 1 configured in this way functions as a five-stage bandpass filter. The center frequency and bandwidth of the pass band of the post-wall waveguide 1 that functions as a bandpass filter can be brought close to or set to a desired value by appropriately designing the design parameters of the post-wall waveguide 1. be able to. That is, the center frequency and bandwidth of the pass band of the post-wall waveguide 1 that functions as a bandpass filter are not limited, and can be appropriately set according to the application. Examples of design parameters, and the number n of the resonance region _R 1 to R _n, each and radius _r 1 ~r _n of the resonance region _R 1 to R _n, such as the distance between the centers of adjacent resonance regions is raised. The radius r ₁ ~r _n and the distance between the centers of adjacent resonance regions will be described later with reference to FIG. 2 (a).

Note that in the post-wall waveguide 1, the resonance region R ₁ to R _5, are coupled in series in this order. However, in the post-wall waveguide 1, the resonance regions R _{1 to} R ₅ are coupled in series in this order, and the resonance region R ₁ and the resonance region R ₅ are connected to the coupling window AP ₂ and the coupling window. It may be directly coupled to the _{AP 5 through a separate coupling window.} The coupling window can be provided by omitting a part of the conductor posts 5i constituting the post walls 5 that separates electromagnetically the the resonance region R ₁ and the resonance region R _5. In this case, in the path from the excitation region _{R E1} to the excitation region _{R E2,} and the resonance region _{R 1} and the resonance region _{R 5,} it is directly and coupled in series, further each of the resonance region _R 2 to R ₄ the order in which is coupled in parallel to the resonance region R _1, R _5, and can be said. As described above, in one aspect of the present invention, the plurality of resonance regions R _{1 to} R _n are those in which a part of the resonance regions is coupled in series and the remaining resonance regions are coupled in series. It may be coupled in parallel with respect to the resonance region.

The substrate 2 is a plate-shaped member made of a dielectric material. In this embodiment, quartz glass is used as the dielectric material constituting the substrate 2. In this case, the thickness of the substrate 2 can be appropriately selected, and is, for example, 860 μm.

Each of the conductor layer 3 and the conductor layer 4 is a layered (or film-shaped) member made of a conductor material, and functions as a first wide wall and a second wide wall of the post-wall waveguide 1, respectively. In this embodiment, copper is used as the conductor material constituting the conductor layer 3 and the conductor layer 4.

The post wall 5 is a set of conductor posts arranged in a fence shape that short-circuits the conductor layer 3 and the conductor layer 4, and functions as a narrow wall of the post wall waveguide 1. In the following, the N conductor posts constituting the post wall 5 will be generally described as conductor posts 5i (N is an arbitrary integer of 2 or more, and i is an integer of 1 ≦ i ≦ N).

The post wall 5 is composed of a pair of narrow walls facing each other and a pair of short walls. The pair of short walls are provided at positions (near the excitation pins 6 and 7) corresponding to both end faces of the post wall waveguide 1 when the post wall waveguide 1 is viewed along the direction in which electromagnetic waves are transmitted. There is. As shown in FIGS. 1 and 2, the pair of narrow walls are parallel to each other in each of the _{excitation region R E1} and the excitation region R _E2.

The distance between the central axes of the adjacent conductor posts 5i and the conductor posts 5i + 1 is sufficiently shorter than the wavelength of the electromagnetic wave having the center frequency of the pass band of the post wall waveguide 1. As a result, the post wall 5 functions as a virtual conductor wall for this electromagnetic wave.

The diameter of the conductor post 5i is, for example, 100 μm, and the distance between the central axes of the conductor posts is, for example, 150 μm or 200 μm. The diameter of the conductor post 5i and the distance between the central axes of the adjacent conductor post 5i and the conductor post 5i + 1 can be appropriately selected according to the wavelength of the electromagnetic wave having the center frequency of the pass band of the post wall waveguide 1. can.

Each conductor post 5i is a through via that is realized by forming a conductor layer on the inner wall of a through hole penetrating the substrate 2 or filling the through hole with a conductor. The arrangement pattern of the post wall 5, the conductor layer 3, a region surrounded by the conductor layer 4, and the post wall 5, a plurality of resonance regions _R 1 to R ₅ which is electromagnetically coupled, the excitation region _{R E1, R E2} It is stipulated to constitute.

In the present embodiment, quartz glass is used as the dielectric material constituting the substrate 2, but the present invention is not limited to this. The dielectric constituting the substrate 2 of the post-wall waveguide 1 may be a dielectric other than quartz, for example, sapphire or alumina.

Further, in the present embodiment, copper is used as the conductor constituting the conductor layer 3 and the conductor layer 4, but the present invention is not limited thereto. The conductor constituting the conductor layer 3 and the conductor layer 4 may be a conductor other than copper, for example, aluminum or an alloy composed of a plurality of metal elements.

Further, in the present embodiment _{, each of the resonance regions R 1 to} R ₅ has a circular shape when viewed in a plan view.

Further, in the present embodiment, _{the number n of the resonance regions R 1 to} R _n is set to 5, but the present invention is not limited to this. That is, the number n can be appropriately selected from any number of two or more. In the present embodiment, the number n is an odd number, but may be an even number.

(Arrangement pattern of conductor post 5i)
The arrangement pattern of the conductor posts 5i constituting the post wall 5 in the post wall waveguide 1 will be described with reference to FIGS. 2A and 2B. In addition, in FIG. 2B, the substrate 2, the conductor layers 3 and 4, and the dielectric layer 10 are not shown.

In FIG. 2A, the arrangement pattern of the conductor posts 5i constituting the post wall 5 is shown. In FIG. 2B, the post wall 5 is illustrated by a solid line as a virtual conductor wall. The virtual conductor wall is obtained by connecting the centers of each conductor post 5i with an arc or a straight line. Further, in the schematic diagram of FIG. 2, the band-shaped conductors 8 and 9 are also schematically shown.

The arrangement pattern of the conductor post 5i is determined so that the region surrounded by the conductor layer 3, the conductor layer 4, and the post wall 5 includes the following configuration.

・ Excitation area _RE1 ,
· Coupling window through the AP ₁ excitation region _{R E1} and electromagnetically coupled resonance region _R 1,
- via the coupling window AP ₂ resonance region R ₁ and the electromagnetically coupled resonant region R _2,
· Coupling window AP ₃ via the resonance region R ₂ and electromagnetically coupled resonant region R _3,
· Coupling window AP ₄ through the resonance region R ₃ and electromagnetically coupled resonant region R _4,
· Coupling window AP ₅ through the resonance region R ₄ and electromagnetically coupled resonant region R _5,
-Excitation region R _E2 that is electromagnetically coupled to the resonance region R ₅ via the coupling window AP ₆ .

Each of the resonance region R ₁ and the resonance region R ₅ is an example of the resonance region of the first stage and the resonance region of the last stage, respectively.

The resonance regions R _{1 to} R ₅ have a circular shape when viewed in a plan view, and the distance between the centers of _{two resonance regions (for example, the resonance region R 2} and the resonance region R _{3) adjacent to each other is the two resonance regions.} It is configured to be smaller than the sum of the radii of. If two resonance regions _R 1, _{R 2} adjacent to each other as an example, center distance _{D 12} is the distance between the center _{C 1} and the center _{C 2 satisfies D 12 <r 1 + r 2} . Similarly, although not shown, the center-to-center distance D ₂₃ satisfies D ₂₃ <r ₂ + r ₃ , the center-to-center distance D ₃₄ satisfies D ₃₄ <r ₃ + r ₄ , and the center-to-center distance D _45. Satisfies D ₄₅ <r ₄ + r ₅ .

Therefore, the two resonance regions adjacent to each other are electromagnetically coupled via the coupling window. For example, two resonance regions R ₂ and R ₃ adjacent to each other are electromagnetically coupled via the coupling window AP _3. Further, the resonance regions R _{1 to} R ₅ are arranged so that the approximate curve obtained as a result of connecting the centers C _{1 to} C _{5 draws an arc.}

When viewed in a plan view, the excitation region _RE1 and the excitation region _RE2 have a rectangular parallelepiped shape in the present embodiment.

(Excitation pins 6 and 7 and microstrip lines MS ₁ , MS ₂ )
Excitation pins 6 and 7 and microstrip lines MS1 and MS2 will be described with reference to FIGS. 1 to 3. As described above, FIG. 1 is a perspective view of the post-wall waveguide 1, and FIG. 2 is a plan view and a schematic view of the post-wall waveguide 1. FIG. 3 is an enlarged cross-sectional view of the post wall waveguide 1, which is an enlarged cross-sectional view of the excitation pin 6 and the microstrip line MS ₁ . The enlarged cross-sectional view of FIG. 3 is an enlarged cross-sectional view of the AA'cross section which is a cross section along the AA' line shown in the plan view of FIG.

As shown in FIG. 3, Drive Pin 6 is a first excitation pin, excitation is formed inside the conductor made of the blind via of the substrate 2 included in the region R _E1, the first excitation portion, as described above This is an example. A strip-shaped conductor 8 is electrically connected to one end of the excitation pin 6 (the end on the positive side of the z-axis).

The strip-shaped conductor 8 is an elongated strip-shaped conductor pattern made of a conductor, and is an example of a first strip-shaped conductor. The strip conductor 8 functions as a signal line of the _{microstrip line MS 1.} The end on the positive side of the x-axis is referred to as the end 8a, the strip-shaped portion is referred to as the main body 8b, and the end on the negative direction of the x-axis is referred to as the end 8c. The strip-shaped conductor 8 is patterned so that the widths of the ends 8a and 8c each exceed the width of the main body 8b. The end portion 8c functions as a terminal for supplying electromagnetic waves to the band-shaped conductor 8 that functions as a signal line. For example, the output terminal of the IC as described above can be connected to the end portion 8c by using a conductive connecting member such as a bump.

The excitation pin 6 is one main surface of the substrate 2, and forms a conductor layer in a non-through hole extending from the main surface on the side where the conductor layer 3 is formed (the side in the positive direction of the z-axis) to the inside of the substrate 2. It is a blind via that is realized by filling the non-through hole with a conductor. Therefore, the other end of the excitation pin 6 (the end on the negative side of the z-axis) is separated from the conductor layer 4.

Of the conductor layer 3 corresponding to the excitation region _RE1 , an anti-pad 3c (an example of the first anti-pad) in which the conductor film is removed in an annular shape is formed in the region including the excitation pin 6 in a plan view. .. As a result, in the region including the excitation pin 6 of the conductor layer 3, an opening 3a and a circular conductor pad 3b left inside the opening 3a are provided. The end portion 8a of the strip-shaped conductor 8 is conducting with the excitation pin 6 via the conductor pad 3b.

Thus constituted Drive Pin 6 excites the excitation region R _E1. The direction in which the main body 8b is stretched starting from the end portion 8a is not limited, but in the present embodiment, the main body 8b is stretched in the negative direction on the x-axis so as to intersect the short wall _{of the excitation region RE1.} There is. Further, the length of the main body 8b can be appropriately determined according to the position of the end portion 8c. In the present embodiment, it is provided with an end portion 8c outside the excitation region R _E1 in a plan view.

Although omitted in FIG. 3, the excitation pin 7 which is an example of the second excitation pin is a blind via made of a conductor formed inside the substrate 2 included in the _{excitation region RE2, as described above.} This is an example of the second excitation unit. Further, the strip-shaped conductor 9 is an elongated strip-shaped conductor pattern made of a conductor, and is an example of a second strip-shaped conductor. The strip-shaped conductor 9 functions as a signal line of the _{microstrip line MS 2.} The strip-shaped conductor 9 is composed of an end portion 9a on the positive direction side of the x-axis, a main body 9b, and an end portion 9c on the negative direction side of the x-axis. Of the conductor layer 3 corresponding to the excitation region _RE2 , an antipad (an example of a second antipad) in which the conductor film is removed in an annular shape is formed in a region including the excitation pin 7 in a plan view. The end portion 9a of the strip-shaped conductor 9 is conducting with the excitation pin 7 via the conductor pattern left inside the anti-pad described above.

Each of the excitation pin 7 and the strip-shaped conductor 9 is configured in the same manner as each of the excitation pin 6 and the strip-shaped conductor 8 except that they are formed in _{the excitation region RE2.} Therefore, the description of the excitation pin 7 and the strip-shaped conductor 9 will be omitted here. The input terminal of the IC for wireless communication can be connected to the end portion 9c by using a conductive connecting member such as a bump.

In post-wall waveguide 1, each of the excitation pins 6 and Drive Pin 7 may each, exciting the excitation region R _E1 and the excitation region R _E2. Therefore, it is possible to suppress the transmission loss that may occur when transmitting between the microstrip line MS ₁ and the excitation region RE ₁ and between the microstrip line MS ₂ and the excitation region RE _2.

Further, in the post wall waveguide 1, by appropriately designing the wiring patterns of the band-shaped conductors 8 and 9, for example, the output terminal of the IC is connected to the end 8c and the input terminal of the IC is connected to the end 9c. Can be done easily.

A mode of mounting the IC on the post-wall waveguide 1 using the ends 8c and 9c will be described later using the post-wall waveguides 1A and 1B, which are modifications of the post-wall waveguide 1 (see FIG. 4). ).

(Distance _DE and Distance D _W )
As shown in the plan view of FIG. 2, the post-wall waveguide 1 is configured such that the distance _DE is shorter than the _{distance D W.} The distance _DE is an example of the distance between the excitation portions, which is the distance between the center C ₆ of the excitation pin _{6 and the center C 7 of the excitation pin 7, and the distance D W} is the resonance region R, which is the resonance region of the first stage. _This is an example of the distance between the centers (that is, the distance between the center C ₁ and the center C _{5 ) between 1 and the resonance region R 5} which is the last resonance region. However, in one aspect of the present invention, the distance _DE may be the distance D _W or less.

_{The condition that the distance DE} and the distance D _{W satisfy the condition DE} ≤ D _{W means that the line segment C 1} C ₆ shown in the schematic diagram of FIG. 2 is extended in the negative direction of the x-axis. ₁ C _{6 and the half straight line C 5} C _{7 which extends the line segment C 5} C ₇ shown in the schematic diagram of FIG. 2 in the negative direction of the x-axis are parallel or have an intersection. _{Therefore, in the post-wall waveguide 1, the distance DE} can be shortened to the same level as or less than that of the post-wall waveguide described in Non-Patent Document 1.

(Design change of _{distance DE)}
As described in the column of [Problems to be solved by the invention], since there are various types of ICs for wireless communication, in order to mount various ICs on the post-wall waveguide 1, the distance _DE It is required to change the design according to the distance between the output terminal and the input terminal of the IC.

As described above, in the post-wall waveguide 1, the resonance regions R _{1 to} R ₅ have a circular shape when viewed in a plan view, and two resonance regions adjacent to each other (for example, the resonance region R ₂ and the resonance region R _3). ) Is configured to be smaller than the sum of the radii of these two resonance regions. If two resonance regions _R 1, _{R 2} adjacent to each other as an example, center distance _{D 12} is the distance between the center _{C 1} and the center _{C 2 satisfies D 12 <r 1 + r 2} . Similarly, although not shown, the center-to-center distance D ₂₃ satisfies D ₂₃ <r ₂ + r ₃ , the center-to-center distance D ₃₄ satisfies D ₃₄ <r ₃ + r ₄ , and the center-to-center distance D _45. Satisfies D ₄₅ <r ₄ + r ₅ .

In the post-wall waveguide 1, since the resonance regions R _{1 to} R ₅ have a circular shape when viewed in a plan view, the resonance regions R _{1 to} R ₅ should not overlap each other, and the above-mentioned conditions should be met. If it is satisfied, when _{the arrangement of the resonance regions R 1 to} R ₅ is designed and redesigned, the center of each _{of the adjacent resonance regions in each center C 1 to} C ₅ or the resonance region with the adjacent excitation pin is satisfied. _{The angles θ 1} , θ ₂ , θ ₃ , θ ₄ , and θ ₅ that form with the line connecting the centers of each of the above can be changed arbitrarily. Therefore, in the post-wall waveguide 1, the distance even when the design change D _E, according to the distance D _E after design modification, the position of the resonance region R ₁ to R _5, and, the excitation region R _E1 , it is possible to easily optimize the position of R _E2.

(Main effect of post wall waveguide 1)
As described above, post-wall waveguide 1, it is possible to shorten the post-wall waveguide and equal to or less than a distance D _E described in Non-Patent Document 1. Sonouede, post-wall waveguide 1, the distance D _E can easily change the design. Therefore, in the post-wall waveguide 1, the distance _DE can be easily redesigned without making the distance _{DE longer than before.}

[First modification and second modification]
Each of (a) and (b) of FIG. 4 is a schematic view of a post-wall waveguide 1A and a schematic view of a post-wall waveguide 1B, respectively. The post-wall waveguide 1A is a first modification of the post-wall waveguide 1, and the post-wall waveguide 1B is a second modification of the post-wall waveguide 1. In FIG. 4, the excitation pins 6 and 7 are indicated by dots. Therefore, in FIG. 4, the reference numerals “6” and “7” indicating the excitation pins are not shown, and only the reference numerals “C ₆ ” and “C ₇ ” indicating the center are shown. Further, in FIGS. 4A and 4B, the reference numerals of the end portion 8a and the end portion 8c of the strip-shaped conductor 8 and the end portions 9a and the end portion 9c of the strip-shaped conductor 9 are omitted. Further, in FIGS. 4A and 4B, the IC 11 is shown by a virtual line (dashed line) in order to make the shape and arrangement of the post wall 5 easy to understand.

_{The distance D W of the} post-wall waveguide 1A is wider than that of the post-wall waveguide 1. On top of that, the excitation region R _E2 is arranged _{between the resonance region R 1} which is the resonance region of the first stage _{and the resonance region R 5} which is the resonance region of the last stage. Accordingly, the excitation pins 7 are also positioned between the resonance region R ₁ and the resonance region R _5.

_{According to the post-wall waveguide 1A, the distance DE} can be further shortened as compared with the post-wall waveguide 1 and the post-wall waveguide described in Non-Patent Document 1.

In the post-wall waveguide 1A, it is disposed between the only excitation region R _E2 comprising an excitation pin 7 and the resonance region R ₁ and the resonance region R _5. However, in one aspect of the present invention, both the excitation region R _E1 and the excitation region R _E2 including an excitation pin 6 may be disposed between the resonance region R ₁ and the resonance region R _5. According to this configuration, the distance _DE can be further shortened.

Further, in the embodiment shown in FIG. 4, the IC 11 is mounted on the surface of the post wall waveguide 1A (on the surface of the dielectric layer 10). Specifically, the output terminal 11a of the IC 11 is electrically connected to the end 8c, and the input terminal 11b of the IC 11 is electrically connected to the end 9c. Conductive connecting members such as bumps and solders can be used for these electrical connections.

As described above, according to the post-wall waveguide 1A, since the excitation pin 7 is _{located between the resonance region R 1} and the resonance region R ₅ , the excitation pin 7 is located between the resonance region R ₁ and the resonance region R ₅ . _{The distance DE} can be shortened as compared with the case where it is not located in between, and _{as a result, the lengths of the microstrip line MS 1} including the band conductor 8 and the _{microstrip line MS 2} including the band conductor 9 can be shortened. ..

The transmission loss in a two-conductor line including the microstrip lines MS ₁ and MS ₂ is often higher than the transmission loss in a post-wall waveguide. Therefore, the post wall waveguide 1A can suppress the transmission loss when the IC 11 is mounted.

Further, the post-wall waveguide that realizes the filter function by electromagnetically coupling a plurality of resonance regions R _{1 to} R _n is good because the no-load Q is higher than that of the filter circuit built in the integrated circuit. Shows the filter characteristics. According to the post-wall waveguide 1A on which the IC is mounted, when the high-frequency signal to be processed in the IC 11 is required to be filtered, the post-wall waveguide 1A having a filter function can be used instead of the filter circuit. .. Therefore, a good high frequency signal can be obtained as compared with a filter module using a filter circuit.

A filter module including a post-wall waveguide 1A and an IC 11 is also included in the scope of the present invention.

Further, when viewed in a plan view, a part of the IC 11 overlaps the _{excitation region R E1} , the resonance region R ₁ , the resonance region R ₂ , and the resonance region R _3. In this way, an aspect of the present invention, when viewed in plan, IC 11, as at least partially overlap at least a portion of the resonance region _R 1 to R _5, and the excitation region _{R E1, R E2,} conductor It is preferably mounted on the layer 3 and the dielectric layer 10.

According to this configuration, the filter module including the post wall waveguide 1A and the IC 11 can be miniaturized.

In the post-wall waveguide 1A, rather than a straight strip-shaped conductor 8, by bending, and sets the angle theta ₈ formed of a strip state 8 the short wall of the excitation region R _E1 below 45 degrees .. By changing the shape of the strip-shaped conductor 8 in this way, the _{design of the angle θ 8} can be arbitrarily changed. The angle θ ₈ is preferably less than 45 degrees.

Further, in the post-wall waveguide 1A, _{the angle θ 8} formed by the band-shaped state 8 and the short wall of the _{excitation region R E1} is set to less than 45 degrees, but the band-shaped state 9 and the short wall of the _{excitation region R E2 are set to be less than 45 degrees.} The angle formed by the two may be set to less than 45 degrees, or both the angle θ ₈ and the angle formed by the band-shaped state 9 and _{the short wall of the excitation region RE2} may be set to less than 45 degrees.

Furthermore, post-wall waveguide 1 and post-wall waveguide 1A are invariably includes five resonance regions _R 1 to R _5, the number n of the plurality of resonance regions _R 1 to R _n are optionally designed can do. For example, as in the post wall waveguide 1B, the number n may be n = 3 or may be an even number.

[Third variant]
FIG. 5 is an enlarged plan view of the post wall waveguide 1C, which is a third modification of the post wall waveguide 1, and is an enlarged plan view of the opening 3d and the strip conductor 8 provided in the post wall waveguide 1C. be. FIG. 6 is an enlarged cross-sectional view of the post wall waveguide 1C, which is an enlarged cross-sectional view of the opening 3d and the strip-shaped conductor 8. The enlarged cross-sectional view of FIG. 6 is an enlarged cross-sectional view of the BB'cross section which is a cross section along the BB' line shown in the plan view of FIG.

The post-wall waveguide 1C is based on the post-wall waveguide 1 shown in FIGS. 1, 2, and 3, and includes the excitation pin 6 and the strip-shaped conductor 8 provided in the post-wall waveguide 1 in FIGS. 5 and 5. While replacing the opening 3d and the strip conductor 8 shown in FIG. 6, the excitation pin 7 and the strip conductor 9 provided in the post wall waveguide 1 are the same as the opening 3d and the strip conductor 8 shown in FIGS. 5 and 6. Obtained by replacing with a configuration. Therefore, in this modification, an example of the first excitation unit in the post-wall waveguide 1C will be described with reference to FIGS. 5 and 6, and the second excitation unit configured in the same manner as the first excitation unit will be described. The description of one example will be omitted.

As shown in FIG. 5, the post-wall waveguide 1C includes a substrate 2, conductor layers 3 and 4, a post wall 5, and a strip-shaped conductor 8 in the same manner as the post-wall waveguide 1. A dielectric substrate 15 having a strip-shaped conductor 8 formed on one main surface, a conductor layer 17 formed on the other main surface of the substrate 15, and a conductor layer 3 and a conductor layer 17 are short-circuited and joined. It includes a solder 18. The post-wall waveguide 1C does not include the dielectric layer 10 provided in the post-wall waveguide 1.

The dielectric constituting the substrate 15 can suppress transmission loss when used as a substrate for a microstrip line, for example, depending on the center frequency of the pass band of the post-wall waveguide 1C functioning as a bandpass filter. It can be appropriately selected from possible dielectrics.

Further, a substrate portion of a commercially available mounting substrate (for example, Megatron 6 (registered trademark) or Rogers RT / duroid (registered trademark) 5880) can be used as the substrate 15. In this case, of the pair of main surfaces of the mounting substrate facing each other, the conductor layer which is one of the main surfaces is patterned to form the strip-shaped conductor 8 described later, and the conductor layer which is the other main surface of the mounting substrate is formed. By patterning, the conductor layer 17 described later can be formed.

In post-wall waveguide 1C, of the conductor layer 3, a portion corresponding to the excitation region R _E1, opening 3d is formed as an example of the first opening. The opening 3d has a rectangular shape in a plan view, and is formed so that its long side is parallel to or substantially parallel to the short wall of the post wall 5. The lengths of the long and short sides of the opening 3d and the distance between the short wall and the opening 3d are not limited and can be appropriately designed.

The band-shaped conductor 8 which is an example of the first band-shaped conductor is formed on one main surface of the substrate 15 (in FIG. 5, the main surface on the side far from the conductor layer 3 and the main surface on the z-axis positive direction side). It is a rectangular conductor pattern, and is provided apart from the conductor layer 3. In the plan view, the strip-shaped conductor 8 is provided so that the extending direction (direction along the long side) of the main body 8b intersects the short wall (so that it is orthogonal to the short wall in this modification) and a part thereof. It is formed on one main surface of the substrate 15 so as to overlap a part of the opening 3d. In this modification, the region of the strip-shaped conductor 8 that overlaps with a part of the opening 3d is referred to as a region 8a. Region 8a is an example of the first excitation unit.

_{The band-shaped conductor 8 constitutes the microstrip line MS 1} together with the conductor layer 17 and the conductor layer 3, and functions as a signal line of the microstrip line MS _1. The width and length of the strip conductor 8 are not limited, and can be appropriately designed.

As shown in FIG. 5, in this modified example, the strip-shaped conductor 8 has a rectangular shape. However, the strip-shaped conductor 8 may have at least a strip-shaped vicinity of the opening 3d and the region 8a in a plan view, and the vicinity of the end portion 8c on the side far from the opening 3d may be patterned in any shape. As in the case of the post wall waveguide 1, the output terminal of the IC can be connected to the end on the side far from 3d by using a conductive connecting member such as a bump.

As described above, the second excitation unit has the same configuration as the first excitation unit. That is, the portion corresponding to the excitation region R _E2 of the conductor layer 3, an opening 3d and identical second opening is formed. The second strip-shaped conductor, which is configured to be the same as the strip-shaped conductor 8, is provided apart from the conductor layer 3, and when viewed in a plan view, a part thereof overlaps with a part of the second opening. .. The portion of the second strip-shaped conductor that overlaps with the second opening is an example of the second excitation portion. _{Further, the second band-shaped conductor constitutes the microstrip line MS 2} together with the conductor layer 17 and the conductor layer 3, and functions as a signal line of the microstrip line MS _2.

According to the post-wall waveguide 1C, (in the present modification strip conductor 8) first strip conductor each and the second strip conductor, respectively, without using the excitation pins 6 and 7, the excitation of the substrate 2 region R _E1 , _RE2 can be excited. Therefore, transmission failure each of the first strip conductor and the second strip conductor are each for excitation region R _E1, R _E2 is not fixed through the excitation pins 6 and 7 with respect, due to changes in environmental temperature Is unlikely to occur.

<Fourth modification>
FIG. 7 is an enlarged plan view of the post wall waveguide 1D, which is a fourth modification of the post wall waveguide 1, and is an enlarged plan view of the opening 3d and the strip conductor 8D provided in the post wall waveguide 1D. be. The post-wall waveguide 1D is also a modification of the post-wall waveguide 1C. In the fourth modification, the changes from the post-wall waveguide 1C in the post-wall waveguide 1D will be described.

In the fourth modification, as shown in FIG. 7, each of the pair of narrow walls constituting the post wall 5 is referred to as a narrow wall 5a and a narrow wall 5b, respectively, and a short circuit constituting the post wall 5 is formed. The wall is referred to as a short wall 5c. As shown in FIG. 7, in the excitation region _{R E1,} the Semakabe 5a and Semakabe 5b, parallel. Further, although not shown, the pair of narrow walls are parallel to each other even in the _{excitation region RE2.}

The post-wall waveguide 1D is based on the post-wall waveguide 1C, replaces the strip-shaped conductor 8 with the strip-shaped conductor 8D, and is a strip-shaped conductor corresponding to the strip-shaped conductor 9, which is configured in the same manner as the strip-shaped conductor 8. It is obtained by replacing the conductor with a configuration corresponding to the strip conductor 8D. The strip-shaped conductor corresponding to the strip-shaped conductor 9 in the post-wall waveguide 1D and the configuration corresponding to the strip-shaped conductor 8D has the strip-shaped conductor 8D with the plane including the central axis of each conductor post 5i constituting the narrow wall 5b as a plane of symmetry. It is configured to be mirror-symmetrical. In the fourth modified example will be described post-wall waveguide 1D using strip conductor 8D exciting the excitation region R _E1.

The strip-shaped conductor 8D is a rectangular conductor pattern formed in the same manner as the strip-shaped conductor 8. The end portions 8Da and 8Dc of the strip-shaped conductor 8D correspond to the ends 8a and 8c of the strip-shaped conductor 8, and the main body 8Db of the strip-shaped conductor 8D corresponds to the main body 8b of the strip-shaped conductor 8. The strip-shaped conductor 8D is different in position on one main surface of the substrate 2 as compared with the strip-shaped conductor 8. Specifically, in plan view of the one main surface of the substrate 2, the strip conductor 8, a straight line parallel to the longitudinal direction (direction in which electromagnetic waves are transmitted) in the excitation region R _E1 in the post-wall waveguide 1D there are, are arranged such post-wall waveguide 1D its central axis line B-B 'of the width W1 is linear, which is a set of bisecting points of the excitation region R _E1 in match. On the other hand, the strip-shaped conductor 8D is arranged so as to be displaced in parallel by the gap ΔG from the BB'line when one main surface of the substrate 2 is viewed in a plan view. In FIG. 7, a straight line that coincides with the central axis of the strip-shaped conductor 8D is shown by the CC'line.

As described above, since the central axis of the band-shaped conductor 8D can be provided so as to be offset from the BB'line, the post-wall waveguide 1D can increase the degree of freedom when arranging the band-shaped conductor 8D.

<First Example Group>
The first embodiment group of the present invention, and the example group of the post-wall waveguide 1D shown in FIG. 7, will be described with reference to FIGS. 8 and 9. FIG. 8 is a graph showing the frequency dependence (hereinafter, referred to as reflection characteristic) of the S parameter S (1,1) of each post-wall waveguide 1D of the first embodiment group. FIG. 9 is a graph showing the frequency dependence (hereinafter, referred to as transmission characteristic) of the S parameter S (2, 1) of each post-wall waveguide 1D of the first embodiment group. In the first embodiment group, the end 8Dc strip conductor 8D as a first port, the ends of the x-axis positive direction side of the excitation region R _E1 as a second port, S parameter S (1, 1 ) And S-parameters S (2, 1) were simulated.

In the post-wall waveguide 1D of the first embodiment group, the following design parameters were adopted with the aim of realizing an operating band including the 28 GHz band in the post-wall waveguide 1D shown in FIG. 7. Each of the post-wall waveguides 1D of the first example group is obtained by changing the gap ΔG within a range of 0 μm or more and 900 μm or less.

(Design parameters)
-Substrate 2: Made of quartz (T11 = 0.86 mm)
・ W1 = 4mm
Substrate 15: Megatron6 (registered trademark) (T15 = 100 μm)
-Conductor layers 3 and 4: Made of copper (thickness 10 μm)
-Conductor layer 17: Made of copper (thickness 18 μm)
Aperture 3d: length of long side = 3.2 mm, length of short side = 400 μm, distance from short wall 5c = 100 μm
-Strip conductor 8D: Copper (thickness 18 μm), width = 200 μm, ΔG = 0,100,200,300,400,500,600,700,800,900 μm
-Solder 18: Thickness = 30 μm
Referring to FIG. 8, in the post-wall waveguide 1D of the first embodiment group, (1) when the gap ΔG is 0 μm or more and 500 μm or less, the S parameter S (1) in the operating band of 27 GHz or more and 29.5 GHz or less. , 1) is below -20 dB, (2) when the gap ΔG is 600 μm, the S parameter S (1,1) exceeds -20 dB in a part of the above operating band, and (3) the gap ΔG is 700 μm or more and 900 μm. In the following cases, it was found that the S parameter S (1,1) exceeds -20 dB in the above operating band.

Further, referring to FIG. 9, in the post-wall waveguide 1D of the first embodiment group, (4) when the gap ΔG is 0 μm or more and 800 μm or less, the S parameter S (2, 1) is set in the above operating band. It was found that when the value exceeds −0.5 dB and (5) the gap ΔG is 900 μm, the S parameter S (2,1) is less than −0.5 dB in the above operating band.

From the above results, the post-wall waveguide 1D of the first embodiment group may adopt a value included in the range of 0 μm or more and 500 μm or less as the gap ΔG in order to show good performance in the above operating band. It turned out to be preferable.

<Fifth variant>
FIG. 10 is an enlarged plan view of the post wall waveguide 1E, which is a fifth modification of the post wall waveguide 1, and is an enlarged plan view of the opening 3dE and the strip conductor 8E provided in the post wall waveguide 1E. be. The post-wall waveguide 1E is also a modification of the post-wall waveguide 1D. In the fifth modification, the changes from the post-wall waveguide 1D in the post-wall waveguide 1E will be described.

The post-wall waveguide 1E is obtained by replacing the opening 3d with an opening 3dE based on the post-wall waveguide 1D. The strip-shaped conductor 8E included in the post-wall waveguide 1E is configured to be the same as the strip-shaped conductor 8D included in the post-wall waveguide 1D. The ends 8Ea and 8Ec of the strip conductor 8E correspond to the ends 8Da and 8Dc of the strip conductor 8D, and the main body 8Eb of the strip conductor 8E corresponds to the main body 8Db of the strip conductor 8D.

The opening 3dE is an opening provided in the conductor layer 3 forming one wide wall of the post wall waveguide 1E like the opening 3d, but its shape is different from that of the opening 3d. Specifically, when one main surface of the substrate 2 is viewed in a plan view, the shape of the opening 3d is a rectangular shape in which the long side is parallel to the short wall 5c and the short side is parallel to the narrow walls 5a and 5b. (See FIG. 7). On the other hand, the shape of the opening 3dE is an isosceles trapezoidal shape in which the portion corresponding to each of the pair of short sides in the opening 3d is a pair of bases (upper base and lower base). The shape of the opening 3dE may be at least trapezoidal, and is preferably an isosceles trapezoidal shape.

In the following, the minimum value of the width (length along the short side) of the opening 3dE (that is, the length of the upper base in the arrangement shown in FIG. 10) is referred to as the width Wa, and the maximum value of the width of the opening 3dE (that is, the figure). The length of the lower base in the arrangement shown in 10) is called the width Wb.

(1) The center of the strip-shaped conductor 8E in the region of the post-wall conductor 1E divided into two with the BB'line, which is a set of points that bisect the width W1 of the post-wall waveguide 1E, as a boundary. The area on the side where the axis (which can be said to be the CC'line) is arranged (the lower area in the arrangement shown in FIG. 10) is referred to as the first area, and (2) the central axis of the strip conductor 8E is arranged. The area on the non-existing side (the upper area in the arrangement shown in FIG. 10) is referred to as a second area. The opening 3dE is formed in the conductor layer 3 so that the longer bottom of the pair of bottoms is located in the first region and the shorter bottom is located in the second region. In other words, the distance from the central axis of the strip conductor 8E to the upper base exceeds the distance from the central axis to the lower base. In the arrangement shown in FIG. 10, the upper bottom is the shortest of the pair of bottoms, and the lower bottom is the longest of the pair of bottoms.

Each of the width Wa and the width Wb can be appropriately determined according to the operating band, the gap ΔG, etc., but in the fifth modification, Wa = 100 μm and Wb = 400 μm are adopted as the widths Wa and Wb, respectively. is doing.

When the central axis of the strip conductor 8E is offset from the BB'line as in the post-wall waveguide 1D shown in FIG. 7, it is compared with the case where the central axis coincides with the BB'line. As a result, the reflection characteristics and transmission characteristics may deteriorate. In the post wall waveguide 1E, the central axis of the strip-shaped conductor 8E is provided so as to be offset from the BB'line, and an isosceles trapezoidal opening 3dE is adopted. Therefore, it is possible to suppress the deterioration of the reflection characteristic and the transmission characteristic that may occur when the central axis of the strip-shaped conductor 8E is provided so as to be offset from the BB'line. That is, the post-wall waveguide 1E can suppress deterioration of the reflection characteristic and the transmission characteristic while increasing the degree of freedom when arranging the strip-shaped conductor 8E.

<Second Example Group>
The second embodiment group of the present invention, and the example group of the post-wall waveguide 1E shown in FIG. 10, will be described with reference to FIGS. 11 and 12. FIG. 11 is a graph showing the reflection characteristics of each post wall waveguide 1E of the second embodiment group. FIG. 12 is a graph showing the transmission characteristics of each post wall waveguide 1E of the second example group. In the second group of embodiments, the end 8Ec strip conductor 8E as a first port, the ends of the x-axis positive direction side of the excitation region R _E1 as a second port, S parameter S (1, 1 ) And S-parameters S (2, 1) were simulated.

The post-wall waveguide 1E of the second embodiment group aims to realize an operating band including the 28 GHz band in the post-wall waveguide 1E shown in FIG. 10, and is a post-wall guide of the first embodiment group. Of the waveguide 1D, the post-wall waveguide 1D with ΔG = 600 μm was used as the base. Then, it is obtained by fixing the width Wb to 400 μm and changing the width Wa within the range of 50 μm or more and 400 μm or less. Of the plots shown in FIGS. 11 and 12, the plot with Wa = 400 μm corresponds to the post-wall waveguide 1D with ΔG = 600 μm.

With reference to FIG. 11, it was found that in the post-wall waveguide 1E of the present example group, the reflection characteristics were improved by reducing the width Wa from 400 μm to 50 μm. More specifically, in the post-wall waveguide 1E of the present example group, (1) when the width Wa is 50 μm or more and 300 μm or less, the S parameter S (1,1) is performed in the operating band of 27 GHz or more and 29.5 GHz or less. Is less than -20 dB, and (2) when the width Wa is 350 μm or more and 400 μm or less, it was found that the S parameter S (1,1) exceeds -20 dB in a part of the above operating band.

Further, referring to FIG. 12, it was found that in the post-wall waveguide 1E of the present example group, the transmission characteristic was improved by reducing the width Wa from 400 μm to 50 μm. In the post-wall waveguide 1E of the present example group, when the width Wa was 50 μm or more and 400 μm or less, the S parameter S (2,1) exceeded −0.5 dB in the above operating band.

From the above results, it is preferable that the post-wall waveguide 1E of the present example group adopts a value included in the range of 50 μm or more and 300 μm or less as the width Wa in order to show good performance in the above operating band. I found out.

<Third Example Group>
Examples of the post-wall waveguide 1E shown in FIG. 10, which is a third embodiment group of the present invention, will be described with reference to FIGS. 13 and 14. FIG. 13 is a graph showing the reflection characteristics of the post-wall waveguide 1E of the third embodiment group. FIG. 14 is a graph showing the transmission characteristics of the post-wall waveguide 1E of the third embodiment group.

The post-wall waveguide 1E of the third embodiment group aims to realize an operating band including the 28 GHz band in the post-wall waveguide 1E shown in FIG. 10, and is a post-wall guide of the first embodiment group. Of the waveguide 1D, the post-wall waveguide 1D with ΔG = 700 μm was used as the base. Then, the width Wb is fixed to 400 μm, and the widths Wa are 50 μm and 400 μm. Of the plots shown in FIGS. 13 and 14, the plot with Wa = 400 μm corresponds to the post-wall waveguide 1D with ΔG = 700 μm.

Referring to FIG. 13, in the post-wall waveguide 1E of the third embodiment group, by adopting Wa = 50 μm, the reflection characteristics can be improved as compared with the case where Wa = 400 μm is adopted. Do you get it. More specifically, in the post-wall waveguide 1E of the present example group, (1) when the width Wa is 50 μm, the S parameter S (1,1) is -20 dB in the operating band of 27 GHz or more and 29.5 GHz or less. It was found that the S parameter S (1,1) exceeds -20 dB in a part of the above operating band when (2) the width Wa is 400 μm.

Further, referring to FIG. 14, in the post-wall waveguide 1E of the third embodiment group, by adopting Wa = 50 μm, the transmission characteristics are improved as compared with the case where Wa = 400 μm is adopted. It turned out. In the post-wall waveguide 1E of the present example group, when the width Wa was 50 μm or more and 400 μm or less, the S parameter S (2,1) exceeded −0.5 dB in the above operating band.

From the above results, for the post-wall waveguide 1E of the third embodiment group, in order to show good performance in the above operating band, it is possible to adopt a value included in the width Wa of 50 μm or more and less than 400 μm. It turned out to be preferable.

[Second Embodiment]
The filter module FM according to the second embodiment of the present invention will be described with reference to FIG. FIG. 15 is an enlarged plan view of the filter module FM, and is an enlarged plan view of the openings 3dEa, 3dEb and the strip conductors 8E, 9E provided in the post wall waveguide 1E constituting the filter module FM according to the second embodiment. It is a figure.

As shown in FIG. 15, the filter module FM includes a post wall waveguide 1E and an RFIC 21F. The RFIC 21F is mounted on one main surface of the substrate 2 (the main surface on the side where the strip conductors 8E and 9E are provided) constituting the _{microstrip lines MS 1} and MS _{2 of the post wall waveguide 1E.}

The RFIC21F includes an output port and an input port. The output port is composed of a signal terminal E1a and ground terminals E2a and E3a arranged so as to sandwich the signal terminal E1a. The input port is composed of a signal terminal E1b and ground terminals E2b and E3b arranged so as to sandwich the signal terminal E1b. That is, each of the output port and the input port is a GSG-arranged port in which terminals are arranged in the order of ground-signal-ground.

<Structure of post wall waveguide 1E>
The post-wall waveguide 1E is configured in the same manner as the post-wall waveguide 1E shown in FIG. Therefore, in the second embodiment, the post-wall waveguide 1E will be briefly described.

As shown in FIG. 15, post-wall waveguide. 1E, the excitation region _{R E1, R E2,} comprises a microstrip line _MS 1, MS _2, a.

(Excitation region R _E1 , R _E2 )
The excitation region _RE1 and the excitation region _RE2 are arranged in parallel and close to each other in the stretching direction.

Excitation region R _E1 includes short wall 5ca is one short wall of a pair of short walls constituting the post-wall waveguide 1E. Excitation region R _E2 includes short wall 5cb is the other short wall of the pair of short walls constituting the post-wall waveguide 1E. In the post wall waveguide 1E, an opening 3dEa (an example of the first opening) is provided in the vicinity of the short wall 5ca among the conductor layers 3 constituting one of the wide walls. In the post wall waveguide 1E, an opening 3dEb (an example of a second opening) is provided in the vicinity of the short wall 5cc of the conductor layer 3 constituting one of the wide walls.

The opening 3dEa has an isosceles trapezoidal shape as described with reference to FIG. Further, the opening 3dEb has an isosceles trapezoidal shape like the opening 3dEa. However, since the openings 3dEa and the openings 3dEb are arranged so as to be line-symmetrical with respect to the narrow wall 5b constituting the post wall 5, the directions in the vertical direction are reversed. The openings 3dEa and 3dEb may be trapezoidal. When the post-wall waveguide 1E is viewed in a plan view, the opening 3dEa is a narrow wall 5a (in the post-wall waveguide 1E in the state shown in FIG. 15) in which a pair of bottoms forming an equilateral trapezoidal shape constitutes the post wall 5. The length of the pair of bottoms of the opening 3dEa so as to be parallel to each of the upper narrow wall 5a) and the narrow wall 5b and from the central axis of the strip conductor 8E (the CC'line shown in FIG. 15). Is arranged so that the distance to the short bottom exceeds the distance from the central axis of the strip conductor 8E to the long bottom of the pair of bottoms of the opening 3dEa. Further, when the post-wall waveguide 1E is viewed in a plan view, the opening 3dEb has a pair of narrow bottom walls 5a (the lower narrowness in the post-wall waveguide 1E in the state shown in FIG. 15) forming an isosceles trapezoidal shape. The length of the pair of bottoms of the opening 3dEb from the central axis (E-E'line shown in FIG. 15) of the strip-shaped conductor 9E described later is parallel to each of the wall 5a) and the narrow wall 5b. The distance to the short bottom is arranged so as to exceed the distance from the central axis of the strip conductor 9E to the long bottom of the pair of bottoms of the opening 3dEb. Further, the long bottom of the pair of openings 3dEa is on the narrow wall 5b side, and the long bottom of the pair of openings 3dEb is on the narrow wall 5b side.

The conductor layer 3 and the microstrip lines MS ₁ and MS ₂ are joined by using solder (not shown in FIG. 15). This solder is an example of a joining member that short-circuits and joins the conductor layer 3 and the conductor layer 17F, and corresponds to the solder 18 provided in the post wall waveguide 1C.

The post-wall waveguide 1E functions as a five-stage bandpass filter like the post-wall waveguide 1. Thus, the filter module FM may, after performing a predetermined filtering process with respect to the electromagnetic waves supplied to the excitation region _{R E1} through the microstrip line MS ₁ from (1) RFIC21F output port, (2) filtering it can be supplied to RFIC21F input port via a microstrip line MS ₂ an electromagnetic wave that has been subjected to the excitation region _{R E2.}

In the filter module FM, the excitation regions _RE1 and _RE2 are arranged so that their extending directions are parallel to each other and their intervals are as narrow as possible. Therefore, each of the excitation region _{R E1, R E2} share a narrow wall 5b separating the excitation region _{R E1, R E2} of Semakabe constituting the post-wall 5. Semakabe 5a constituting the excitation region _{R E1} and the Semakabe 5b (Semakabe 5a of the upper described above), are parallel to each other. Also, the a Semakabe 5b (Semakabe 5a of the above-mentioned lower) Semakabe 5a constituting the excitation region R _E2, are parallel to each other.

(Microstrip line MS ₁ , MS ₂ )
The microstrip lines MS ₁ and MS ₂ include a substrate 15F and a conductor layer 17F. The substrate 15F and the conductor layer 17F are common members in the _{microstrip lines MS 1} and MS _2. Each of the microstrip lines MS ₁ and MS ₂ includes strip conductors 8E and 9E, respectively. The substrate 15F corresponds to the substrate 15 of the post wall waveguide 1C, the conductor layer 17F corresponds to the conductor layer 17 of the post wall waveguide 1C, and the strip conductors 8E and 9E correspond to the strip conductor 8 of the post wall waveguide 1C. Corresponds to. Further, each of the band-shaped conductors 8E and 9E is an example of a third band-shaped conductor and a fourth band-shaped conductor, respectively.

In post-wall waveguide 1E, a mode in the microstrip line MS _1, mode A in the excitation region R _E1, through an area where a portion of the strip conductor 8E, a part of the opening 3dEa are overlapped in plan view Is combined. Similarly, in the post-wall waveguide 1E, a mode in the microstrip line MS _2, mode A in the excitation region R _E2, and a portion of the strip conductor 9E, a portion of the opening 3dEb are overlapped in plan view Combined through regions. That is, the post-wall waveguide 1E can convert these modes through openings 3dEa, 3dEb that do not come into direct contact with the strip conductors 8E, 9E without the use of excitation pins.

In the filter module FM, the post wall waveguide 1E is configured to be mirror-symmetrical with the plane including the central axis of each conductor post 5i constituting the narrow wall 5b as a plane of symmetry.

FIG indicated line B-B 'is, B-B shown in FIG. 10' to 15 similarly to the line, a set of the width bisecting point of the excitation region R _E1 constituting the post-wall waveguide 1E linear The CC'line shown in FIG. 15 is a straight line that coincides with the central axis of the strip-shaped conductor 8E, like the CC'line shown in FIG. D-D shown in FIG. 15 'line is a straight line width of the excitation region R _E2 is a set of bisecting points constituting post-wall waveguide 1E, E-E shown in FIG. 15 along line Is a straight line that coincides with the central axis of the strip conductor 9E.

As shown in FIG. 15, each of the strip conductors 8E and 9E has a gap in the direction in which the distance between the central axes approaches each other with reference to the position of the BB'line and the position of the DD'line, respectively. Only ΔGa and ΔGb are arranged so as to be offset in parallel. That is, when the post-wall waveguide 1E is viewed in a plan view, the central axis of the band-shaped conductor 8E and the central axis of the band-shaped conductor 9E are both located between the BB'line and the DD' line. In the filter module FM, ΔGa = ΔGb. Therefore, in the following, the gaps ΔGa and ΔGb are also simply referred to as gaps ΔG.

<Configuration for mounting RFIC21F>
Of the pair of tip portions of the strip-shaped conductor 8E, the tip portion that is close to the opening 3dEa and protrudes from the opening 3dEa is referred to as one tip portion, and the tip portion on the side far from the opening 3dEa is referred to as the other tip portion. The other tip of the strip conductor 8E functions as a signal conductor pad for connecting to the signal terminal E1a of the RFIC 21F. Ground conductor pads G2a and G3a for connecting to each of the ground terminals E2a and E3a of the RFIC21F are formed on both sides of the other tip of the strip conductor 8E so as to sandwich the other tip. .. Each of the ground conductor pads G2a and G3a is short-circuited with the conductor layer 3. In this way, the GSG arrangement is a terminal for connecting the output port of the RFIC21F to the other tip and the vicinity of the band-shaped conductor 8E, and the conductor pads are arranged in the order of ground-signal-ground. Terminals are formed.

A signal terminal E1a is connected to the other tip of the strip conductor 8E using a bump B1a, and bumps B2a and B3a are used to connect the ground terminals E2a and E3a to each of the ground conductor pads G2a and G3a, respectively. Each is connected.

Similarly, of the pair of tip portions of the strip-shaped conductor 9E, the tip portion close to the opening 3dEb and protruding from the opening 3dEb is referred to as one tip portion, and the tip portion on the side far from the opening 3dEb is referred to as the other tip portion. Terminals for connecting the input port of the RFIC 21F, which are GSG-arranged terminals, are formed at the other tip of the strip conductor 9E and in the vicinity thereof. The terminal of the GSG arrangement is composed of the other tip portion of the strip-shaped conductor 9E and the ground conductor pads G2b and G3b arranged so as to sandwich the other tip portion. A signal terminal E1b is connected to the other tip of the strip conductor 9E using a bump B1b, and bumps B2b and B3b are used to connect the ground terminals E2b and E3b to each of the ground conductor pads G2b and G3b, respectively. Each is connected.

According to the filter module FM, the strip conductor 8E is provided so that the central axis of the strip conductor 8E coincides with the BB'line, and the central axis of the strip conductor 9E coincides with the DD'line. Compared with the case where the band-shaped conductor 9E is provided, the distance between the central axes of the band-shaped conductors 8E and 9E can be narrowed by 2ΔG. Therefore, the distance between the signal terminal E1a constituting the output port and the signal terminal E1b forming the input port is the distance between the BB'line and the DD' line (that is, in the excitation regions R _E1 and R _E2 ). Even when the RFIC 21F narrower than the width) is mounted on the microstrip lines MS ₁ and MS ₂ , it can be easily mounted.

[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 technical means of the present invention can also be obtained by appropriately combining the above-mentioned technical means. Included in the range.

1, 1A, 1B, 1C, 1D, 1E post-wall waveguide R _{E1, R E2} excitation region (the first excitation region, the second excitation region)
2 Substrate 3,4 Conductor layer (1st wide wall, 2nd wide wall)
3a opening 3b conductor pad (first conductor pad)
3c anti-pad (first anti-pad)
3d, 3dE, 3dEa opening (first opening)
3dEb opening (second opening)
5 Post wall (narrow wall)
5i Conductor post 6,7 Excitation pin (1st excitation part, 2nd excitation part)
8,8D, 8E strip-shaped conductor (first strip-shaped conductor)
9,9E strip-shaped conductor (second strip-shaped conductor)
Area 8a (1st excitation section)
10 Dielectric layer

Claims (11)

It includes a dielectric substrate, a first wide wall and a second wide wall formed on each of the pair of main surfaces of the substrate, and a post wall formed inside the substrate.
The first wide wall, the second wide wall, and the post wall are adjacent to a plurality of resonance regions connected in series, a first excitation region adjacent to the resonance region of the first stage, and a resonance region of the last stage. Consists of the second excitation area,
The first excitation region and the second excitation region are connected only via the plurality of resonance regions.
When viewed in a plane
Each of the plurality of resonance regions has a circular shape.
For each of the two resonance regions adjacent to each other among the plurality of resonance regions, the radii of the two resonance regions are r ₁ and r _2, and the distance between the centers of these two resonance regions is D ₁₂ . When this is done, it is arranged so that _{D 12} <r ₁ + r ₂
The distance between the excitation units, which is the distance between the first excitation unit provided in the first excitation region and the second excitation unit provided in the second excitation region, is the resonance between the first stage resonance region and the last stage resonance. Less than the center-to-center distance to the area,
A post-wall waveguide characterized by that. It includes a dielectric substrate, a first wide wall and a second wide wall formed on each of the pair of main surfaces of the substrate, and a post wall formed inside the substrate.
The first wide wall, the second wide wall, and the post wall are adjacent to a plurality of resonance regions connected in series, a first excitation region adjacent to the resonance region of the first stage, and a resonance region of the last stage. Consists of the second excitation area,
The first excitation region and the second excitation region are connected only via the plurality of resonance regions.
When viewed in a plane
Each of the plurality of resonance regions has a circular shape.
For each of the two resonance regions adjacent to each other among the plurality of resonance regions, the radii of the two resonance regions are r ₁ and r _2, and the distance between the centers of these two resonance regions is D ₁₂ . When this is done, it is arranged so that _{D 12} <r ₁ + r ₂
The distance between the excitation units, which is the distance between the first excitation unit provided in the first excitation region and the second excitation unit provided in the second excitation region, is the resonance between the first stage resonance region and the last stage resonance. Less than or equal to the center-to-center distance to the area
At least one of the first excitation unit and the second excitation unit is located between the resonance region of the first stage and the resonance region of the last stage.
Features and be Repos strike wall waveguide that. A first anti-pad is formed in a portion of the first wide wall corresponding to the first excitation region.
The first excitation unit is a first excitation pin extending from the first conductor pad surrounded by the first anti-pad to the inside of the first excitation region.
A second anti-pad is formed in a portion of the first wide wall corresponding to the second excitation region.
The second excitation unit is a second excitation pin extending from the second conductor pad surrounded by the second anti-pad to the inside of the second excitation region.
The post-wall waveguide according to claim 2. A first band-shaped conductor having one end conducting to the first conductor pad and forming a two-conductor line together with the first wide wall.
One end is electrically connected to the second conductor pad, and further includes a second strip-shaped conductor forming a two-conductor line together with the first wide wall.
The post-wall waveguide according to claim 3. A first opening is formed in a portion of the first wide wall corresponding to the first excitation region.
A second opening is formed in a portion of the first wide wall corresponding to the second excitation region.
A first strip-shaped conductor provided apart from the first wide wall, and a first strip-shaped conductor in which a part of the conductor overlaps with at least a part of the first opening when viewed in a plan view.
A second strip-shaped conductor provided apart from the first wide wall, and a second strip-shaped conductor in which a part of the conductor overlaps with at least a part of the second opening when viewed in a plan view. Further prepare
The first excitation portion is a portion of the first strip-shaped conductor that overlaps with the first opening.
The post-wall waveguide according to claim 2 , wherein the second exciting portion is a portion of the second strip-shaped conductor that overlaps with the second opening. The first strip-shaped conductor constitutes a two-conductor line together with the first wide wall.
The second strip-shaped conductor constitutes a two-conductor line together with the first wide wall.
The post-wall waveguide according to claim 5. When viewed in a plane
The pair of narrow walls forming the first excitation region are parallel to each other, and a straight line that is a set of points that bisect the width of the first excitation region and the central axis of the first strip conductor. Is out of alignment
The pair of narrow walls forming the second excitation region are parallel to each other, and a straight line that is a set of points that bisect the width of the second excitation region and the central axis of the second strip conductor. The post-wall waveguide according to claim 5 or 6, wherein is offset. When viewed in a plane
Each of the first opening and the second opening is trapezoidal and has a trapezoidal shape.
The first opening is arranged so that the pair of bottoms forming the trapezoidal shape are parallel to each of the pair of narrow walls forming the first excitation region, and from the central axis of the first strip conductor. The distance from the central axis of the first strip conductor to the long bottom of the pair of bottoms of the first opening is from the central axis of the pair of bottoms of the first opening to the long bottom of the pair of bottoms of the first opening. Are arranged to exceed the distance of
The second opening is arranged so that the pair of bottoms forming the trapezoidal shape are parallel to each of the pair of narrow walls forming the second excitation region, and from the central axis of the second strip conductor. The distance from the central axis of the second strip conductor to the long bottom of the pair of bottoms of the second opening is from the central axis of the second opening to the long bottom of the pair of bottoms of the second opening. Are arranged to exceed the distance of
The post-wall waveguide according to claim 7. It includes a dielectric substrate, a first wide wall and a second wide wall formed on each of the pair of main surfaces of the substrate, and a post wall formed inside the substrate.
The first wide wall, the second wide wall, and the post wall are adjacent to a plurality of resonance regions connected in series, a first excitation region adjacent to the resonance region of the first stage, and a resonance region of the last stage. Consists of the second excitation area,
The first excitation region and the second excitation region are connected only via the plurality of resonance regions.
When viewed in a plane
Each of the plurality of resonance regions has a circular shape.
For each of the two resonance regions adjacent to each other among the plurality of resonance regions, the radii of the two resonance regions are r ₁ and r _2, and the distance between the centers of these two resonance regions is D ₁₂ . When this is done, it is arranged so that _{D 12} <r ₁ + r ₂
The distance between the excitation units, which is the distance between the first excitation unit provided in the first excitation region and the second excitation unit provided in the second excitation region, is the resonance between the first stage resonance region and the last stage resonance. Less than or equal to the center-to-center distance to the area
A first anti-pad is formed in a portion of the first wide wall corresponding to the first excitation region.
The first excitation unit is a first excitation pin extending from the first conductor pad surrounded by the first anti-pad to the inside of the first excitation region.
A second anti-pad is formed in a portion of the first wide wall corresponding to the second excitation region.
The second excitation unit is a second excitation pin extending from the second conductor pad surrounded by the second anti-pad to the inside of the second excitation region.
A first band-shaped conductor having one end conducting to the first conductor pad and forming a two-conductor line together with the first wide wall.
A second strip-shaped conductor, one end of which is conductive to the second conductor pad and which constitutes a two-conductor line together with the first wide wall, is further provided.
When viewed in a plan view, the angle formed by the first band-shaped conductor and the post wall forming the first excitation region intersecting with the first band-shaped conductor, and the second band-shaped conductor intersecting with the second band-shaped conductor. At least one of the angles formed by the post wall constituting the second excitation region is less than 45 °.
Features and be Repos strike wall waveguide that. The post-wall waveguide according to any one of claims 1 to 9.
An integrated circuit mounted on the first wide wall, the integrated circuit having an output terminal connected to the first excitation unit and an input terminal connected to the second excitation unit. ,
A filter module that features that. When viewed in a plan view, the integrated circuit is placed on the first wide wall so that at least a part of the integrated circuit overlaps at least a part of the plurality of resonance regions, the first excitation region, and the second excitation region. Implemented,
The filter module according to claim 10.

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