Antenna substrate and antenna module

Abstract

An antenna substrate (1) is provided with: a substrate (2); a planar first radiation electrode (3) disposed on the substrate (2); a second radiation electrode (4) disposed on the substrate (2) so as to be spatially separated from the first radiation electrode (3) in a second direction (X) when viewed from a first direction (Z) along the thickness direction of the substrate (2); and a ground section (5) that is disposed on the substrate (2) and is shared by the first radiation electrode (3) and the second radiation electrode (4), the ground section (5) including: a ground electrode (51) that faces the first radiation electrode (3) when viewed from the first direction (Z); a connection line (52) that is positioned between the first radiation electrode (3) and the second radiation electrode (4) when viewed from the first direction (Z), and that has a smaller size than the ground electrode (51) in a third direction (Y) orthogonal to the second direction (X) when viewed from the first direction (Z); and a stub line (53) connected to one of a first side (52a) and a second side (52b) of the connection line (52), the first side (52a) and the second side (52b) facing each other in the third direction (Y).

Description

Technical Field

[0001] The present disclosure relates to an antenna substrate and an antenna module. Background Art

[0002] Patent Document 1 discloses adjusting the characteristics of a ground plate in order to optimize the performance of an antenna system. Figure 2 An example of an antenna system is shown. Figure 2 System 200 includes a ground plane (201), antenna elements (202, 203), a filter (204), and signals (205, 206). The filter is implemented by forming eight slots (204a) in the ground plane. The eight slots are orthogonal to the linear path between the antenna elements but do not cross the entire length of the ground plane. This forms a conductive path (204b) in the ground plane that connects the antenna elements. The slot width is sufficiently narrow that capacitive coupling occurs across the width of the slot, generating a capacitive reactance component. On the other hand, the conductive path generates an inductive reactance component. The filter is an LC filter composed of capacitive and inductive reactance components.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: U.S. Patent Application Publication No. 2008 / 94302 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] In Patent Document 1, the filter reduces signals, contributing to improved isolation between antenna elements. In order for the slot to function effectively, the slot length must be sufficiently long based on the frequency band of the signal to be reduced. Furthermore, the ground plane itself must be enlarged to form a sufficiently long slot, which increases the overall size of the antenna system.

[0008] The present disclosure provides an antenna substrate and an antenna module that can improve the isolation characteristics between a first radiation electrode and a second radiation electrode and can also be miniaturized.

[0009] Solutions for solving problems

[0010] An antenna substrate according to one aspect of the present disclosure includes: a substrate; a planar first radiation electrode disposed on the substrate; a second radiation electrode disposed on the substrate so as to be spatially separated from the first radiation electrode in a second direction when viewed from a first direction along the thickness direction of the substrate; and a ground portion disposed on the substrate and shared by the first radiation electrode and the second radiation electrode, the ground portion including: a ground electrode opposing the first radiation electrode when viewed from the first direction; a connecting line located between the first radiation electrode and the second radiation electrode when viewed from the first direction and having a dimension smaller than that of the ground electrode in a third direction perpendicular to the second direction when viewed from the first direction; and a stub connected to one of a first side and a second side of the connecting line opposing each other in the third direction.

[0011] An antenna module according to one aspect of the present disclosure includes: the antenna substrate described above; and an electronic component mounted on the antenna substrate.

[0012] Effects of the Invention

[0013] The aspect of the present disclosure can improve the isolation characteristics between the first radiation electrode and the second radiation electrode while also enabling miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a perspective view of a configuration example of the antenna module according to the first embodiment.

[0015] Figure 2 yes Figure 1 The antenna module includes a top view of an antenna substrate.

[0016] Figure 3 yes Figure 1 The antenna module includes a bottom view of an antenna substrate.

[0017] Figure 4 It is a bottom view of a structural example of an antenna substrate according to the second embodiment.

[0018] Figure 5 It is a bottom view of a structural example of an antenna substrate according to a third embodiment.

[0019] Figure 6 It is a bottom view of a structural example of an antenna substrate according to a fourth embodiment.

[0020] Figure 7 It is a bottom view of a structural example of an antenna substrate according to a fifth embodiment.

[0021] Figure 8 It is a perspective view of a structural example of an antenna substrate according to a sixth embodiment.

[0022] Figure 9 yes Figure 8 A top view of the antenna substrate.

[0023] Figure 10 yes Figure 8 Bottom view of the antenna substrate.

[0024] Figure 11 It is a perspective view of a structural example of an antenna substrate according to a seventh embodiment.

[0025] Figure 12 yes Figure 11 A top view of the antenna substrate.

[0026] Figure 13 yes Figure 11 Bottom view of the antenna substrate. DETAILED DESCRIPTION

[0027] [1. Implementation Method]

[0028] Hereinafter, the embodiments of the present disclosure will be described with reference to the accompanying drawings as appropriate. However, the following embodiments are examples for illustrating the present disclosure, and the present disclosure is not limited to the following contents (for example, the shape, size, configuration, etc. of each component). Unless otherwise stated, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the accompanying drawings. The figures described in the following embodiments are schematic figures, and the ratios of the sizes and thicknesses of the components in the figures do not necessarily reflect the actual size ratios. In addition, the size ratios of the elements are not limited to the ratios shown in the accompanying drawings.

[0029] In addition, in the following description, when there is a need to distinguish multiple components from each other, prefixes such as "1st" and "2nd" are marked on the names of the components. However, when the components can be distinguished from each other using the figure marks marked on the components, there are cases where prefixes such as "1st" and "2nd" are omitted for the sake of readability of the article.

[0030] [1.1 Implementation Method 1]

[0031] [1.1.1 Structure]

[0032] Figure 1 : is a perspective view of a configuration example of an antenna module 10 according to Embodiment 1. The antenna module 10 is mounted on a device for wireless communication within a predetermined frequency band, for example. The antenna module 10 includes an antenna substrate 1 and electronic components 11 and 12 mounted on the antenna substrate 1. Figure 1 , electronic components 11 and 12 are schematically shown.

[0033] Figure 2 It is a top view of the antenna substrate 1 . Figure 3 It is a bottom view of the antenna substrate 1 .

[0034] like Figure 1 、 Figure 2 as well as Figure 3 As shown, the antenna substrate 1 includes a substrate 2 , a first radiation electrode 3 , a second radiation electrode 4 , a ground portion 5 , a first feed point 61 , and a second feed point 62 .

[0035] The substrate 2 has a thickness. In this embodiment, a direction along the thickness of the substrate 2 is referred to as a first direction Z. Two mutually orthogonal directions of the substrate 2 as viewed from the first direction Z are referred to as a second direction X and a third direction Y. In this embodiment, the second direction X and the third direction Y are each orthogonal to the first direction Z. In this embodiment, the substrate 2 is a rectangular plate. For example, the second direction X is the longitudinal direction of the substrate 2, and the third direction Y is the width direction of the substrate 2.

[0036] like Figure 1 As shown, substrate 2 includes a dielectric layer 20. Dielectric layer 20 has a first main surface 21 and a second main surface 22 opposite first main surface 21. First main surface 21 and second main surface 22 are, for example, two surfaces in the thickness direction of dielectric layer 20. Substrate 2 includes a protective layer 23. Protective layer 23 has electrical insulating properties and covers second main surface 22 of dielectric layer 20. In some cases, the illustration of protective layer 23 is omitted for clarity.

[0037] The substrate 2 is, for example, a dielectric substrate. Examples of dielectric substrates include low-temperature co-fired ceramic (LTCC) multilayer substrates, multilayer resin substrates formed by laminating multiple resin layers composed of resins such as epoxy and polyimide, multilayer resin substrates formed by laminating multiple resin layers composed of liquid crystal polymer (LCP) having a lower dielectric constant, multilayer resin substrates formed by laminating multiple resin layers composed of fluorine-based resins, and ceramic multilayer substrates other than LTCC.

[0038] like Figure 2 As shown, the first radiation electrode 3 and the second radiation electrode 4 are located on the first main surface 21 of the dielectric layer 20 of the substrate 2. The first radiation electrode 3 and the second radiation electrode 4 are arranged on the first main surface 21 of the dielectric layer 20 at intervals in the second direction X. The second radiation electrode 4 is arranged on the substrate 2 spatially separated from the first radiation electrode 3 in the second direction X when viewed from the first direction Z. Figure 2 In the embodiment, the first radiation electrode 3 and the second radiation electrode 4 are located at both ends of the dielectric layer 20 of the substrate 2 in the second direction X. As described above, the second direction X is the longitudinal direction of the substrate 2, and the third direction Y is the width direction of the substrate 2. This structure enables miniaturization of the substrate 2.

[0039] The first radiation electrode 3 is a conductor pattern formed on the first main surface 21 of the dielectric layer 20. The first radiation electrode 3 is planar. Figure 2The first radiation electrode 3 is substantially rectangular when viewed from the first direction Z. Figure 2 As shown in FIG, the first radiation electrode 3 is line-symmetrical with respect to a line passing through the center C3 of the first radiation electrode 3 and parallel to the second direction X when viewed from the first direction Z.

[0040] The second radiation electrode 4 is a conductor pattern formed on the first main surface 21 of the dielectric layer 20. The second radiation electrode 4 is planar. Figure 2 The second radiation electrode 4 is substantially rectangular when viewed from the first direction Z. Figure 2 As shown, the second radiation electrode 4 is line-symmetrical with respect to a line passing through the center C4 of the second radiation electrode 4 and parallel to the second direction X when viewed from the first direction Z. In this embodiment, as shown in FIG. Figure 2 As shown, the center C3 of the first radiation electrode 3 and the center C4 of the second radiation electrode 4 are aligned along the second direction X when viewed from the first direction Z. In other words, the straight line connecting the center C3 of the first radiation electrode 3 and the center C4 of the second radiation electrode 4 is parallel to the second direction X.

[0041] The shapes of the first radiation electrode 3 and the second radiation electrode 4 are determined by the frequency band used for wireless communication. In this embodiment, the first radiation electrode 3 and the second radiation electrode 4 have the same shape. Examples of frequency bands for wireless communication include those for Wi-Fi-based wireless communication. Examples of frequency bands for Wi-Fi-based wireless communication include those near 2.4 GHz (e.g., 2.4 GHz to 2.5 GHz) and those near 5 GHz (e.g., 5.15 GHz to 5.8 GHz).

[0042] Increasing the dimensions of the first radiation electrode 3 and the second radiation electrode 4 in the third direction Y can expand the frequency band of wireless communication. Meanwhile, the first radiation electrode 3 and the second radiation electrode 4 are located at both ends of the dielectric layer 20 of the substrate 2 in the second direction X. Therefore, reducing the dimensions of the first radiation electrode 3 and the second radiation electrode 4 in the third direction Y can reduce the size of the substrate 2 in the third direction Y.

[0043] like Figure 3 As shown, the ground portion 5 is located on the second main surface 22 of the dielectric layer 20 of the substrate 2. The ground portion 5 is a ground portion shared by the first radiation electrode 3 and the second radiation electrode 4. The ground portion 5 serves as a ground for the first radiation electrode 3 and the second radiation electrode 4.

[0044] The ground portion 5 includes a ground electrode 51, a connection line 52, and a plurality of stubs 53-1 to 53-4 (hereinafter collectively referred to as 53). Furthermore, the ground portion 5 includes a ground electrode 54 that is different from the ground electrode 51. To clearly distinguish the ground electrodes 51 and 54 from each other, the ground electrode 51 is sometimes referred to as the first ground electrode 51, and the ground electrode 54 is sometimes referred to as the second ground electrode 54.

[0045] like Figure 3 As shown, the first ground electrode 51 and the second ground electrode 54 are arranged on the second main surface 22 of the dielectric layer 20 at intervals in the second direction X. The first ground electrode 51 and the second ground electrode 54 are located at both ends of the dielectric layer 20 of the substrate 2 in the second direction X.

[0046] The first ground electrode 51 faces the first radiation electrode 3 when viewed from the first direction Z. The first radiation electrode 3 and the first ground electrode 51 constitute a planar antenna (patch antenna). The first ground electrode 51 is a conductor pattern formed on the second main surface 22 of the dielectric layer 20. The first ground electrode 51 is planar. The first ground electrode 51 has a substantially rectangular shape when viewed from the first direction Z. The dimensions of the first ground electrode 51 are larger than those of the first radiation electrode 3. When viewed from the first direction Z, the first radiation electrode 3 is embedded inside the first ground electrode 51.

[0047] The second ground electrode 54 faces the second radiation electrode 4 when viewed from the first direction Z. The second radiation electrode 4 and the second ground electrode 54 constitute a planar antenna (patch antenna). The second ground electrode 54 is a conductor pattern formed on the second main surface 22 of the dielectric layer 20. The second ground electrode 54 is planar. The second ground electrode 54 has a generally rectangular shape when viewed from the first direction Z. The second ground electrode 54 is larger than the second radiation electrode 4. When viewed from the first direction Z, the second radiation electrode 4 is embedded inside the second ground electrode 54.

[0048] In the antenna substrate 1, the first ground electrode 51 and the first radiating electrode 3 together form a planar antenna (patch antenna), and the second ground electrode 54 and the second radiating electrode 4 also form a planar antenna (patch antenna). This structure improves the electrical symmetry of the antenna substrate 1, contributing to improved isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4 and antenna characteristics. Furthermore, since the antenna substrate 1 includes antennas of the same type (patch antennas), it is possible to increase the antenna gain in the first direction Z.

[0049] In the present embodiment, the first ground electrode 51 and the second ground electrode 54 have the same shape.

[0050] The connecting line 52 is located between the first radiation electrode 3 and the second radiation electrode 4 when viewed from the first direction Z. In this embodiment, the connecting line 52 is located between the first ground electrode 51 and the second ground electrode 54 when viewed from the first direction Z. More specifically, the connecting line 52 connects the first ground electrode 51 and the second ground electrode 54. In other words, the connecting line 52 extends from the first ground electrode 51 to the second ground electrode 54 along the second direction X. The connecting line 52 is a conductor pattern formed on the second major surface 22 of the dielectric layer 20. In this embodiment, the first ground electrode 51, the second ground electrode 54, and the connecting line 52 are continuously and integrally formed.

[0051] When viewed from the first direction Z, the center C3 of the first radiation electrode 3 and the center C5 of the connecting line 52 are aligned along the second direction X. In other words, the straight line L1 connecting the center C3 of the first radiation electrode 3 and the center C5 of the connecting line 52 is parallel to the second direction X. This structure facilitates the distribution of the current flowing in the connecting line 52 to be line-symmetrical with respect to the straight line L1. This further improves the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0052] The connecting line 52 has a shape that is line-symmetrical with respect to a line passing through the center C3 of the first radiation electrode 3 and parallel to the second direction X. This structure facilitates the distribution of the current flowing through the connecting line 52 to be line-symmetrical with respect to a line passing through the center C5 of the connecting line 52 and parallel to the second direction X. This further improves the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0053] The connection line 52 is planar. The connection line 52 is substantially rectangular when viewed from the first direction Z. The connection line 52 has a first side 52a and a second side 52b that are opposite to each other in the third direction Y. In this embodiment, the first side 52a and the second side 52b are parallel to the second direction X. The size of the connection line 52 in the third direction Y is smaller than that of the first ground electrode 51. Figure 3As shown, the dimension D1 of the connecting line 52 in the third direction Y (i.e., the distance between the first side 52a and the second side 52b) is smaller than the dimension D2 of the first ground electrode 51 in the third direction Y. Dimension D2 is the distance between the first side 51a and the second side 51b of the first ground electrode 51, which are opposite to each other in the third direction Y. This structure makes it easier for current to concentrate on the connecting line 52 than on the first ground electrode 51. In this embodiment, the first ground electrode 51 is roughly rectangular, and the first side 51a and the second side 51b are parallel to the second direction X. Therefore, the first side 51a of the first ground electrode 51 is parallel to the first side 52a of the connecting line 52, and the second side 51b of the first ground electrode 51 is parallel to the second side 52b of the connecting line 52. The first side 51a of the first ground electrode 51 is located on the same side as the first side 52a of the connecting line 52 (the side opposite to the third direction Y). The second side 51 b of the first ground electrode 51 is located on the same side (the third direction Y side) as the second side 52 b of the connection line 52 .

[0054] The size of the connection line 52 in the third direction Y is smaller than that of the first radiation electrode 3. Figure 3 As shown, the dimension D1 of the connecting line 52 in the third direction Y is smaller than the dimension D3 of the first radiation electrode 3 in the third direction Y. Dimension D3 is the distance between the first side 3a and the second side 3b of the first radiation electrode 3, which face each other in the third direction Y. This structure enables miniaturization of the substrate 2 in the third direction Y. In this embodiment, the first radiation electrode 3 has a substantially rectangular shape, with the first side 3a and the second side 3b parallel to the second direction X. Therefore, the first side 3a of the first radiation electrode 3 is parallel to the first side 52a of the connecting line 52, and the second side 3b of the first radiation electrode 3 is parallel to the second side 52b of the connecting line 52. The first side 3a of the first radiation electrode 3 is located on the same side as the first side 52a of the connecting line 52 (on the opposite side of the third direction Y). The second side 3b of the first radiation electrode 3 is located on the same side as the second side 52b of the connecting line 52 (on the side in the third direction Y).

[0055] The stub 53 is connected to one of the first side 52a and the second side 52b of the connecting line 52. The stub 53 is provided to improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. The stub 53 is a distributed constant circuit. The stub 53 is an open-circuited stub with its end open. The resonant frequency of the open-circuited stub is the frequency at which the electrical length of the open-circuited stub becomes 1 / 4 of the wavelength. The stub 53 can attenuate high-frequency signals on the connecting line 52 near its resonant frequency. This improves the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. As an example, the resonant frequency of the stub 53 is set based on the frequency band of the high-frequency signals supplied to the first radiation electrode 3 and the second radiation electrode 4.

[0056] As described above, the dimension D1 of the connecting line 52 is smaller than the dimension D2 of the first ground electrode 51. Therefore, current tends to concentrate on the connecting line 52 compared to the first ground electrode 51. Since the stub 53 is connected to the connecting line 52 rather than the first ground electrode 51, current tends to flow through the stub 53. Consequently, the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 can be effectively improved. Furthermore, since the stub 53 is connected to the connecting line 52 rather than the first ground electrode 51, the length of the stub 53 can be set independently of the ground electrode 51. Therefore, unlike the structure in Patent Document 1, which forms a slit in the ground plate, there is no need to enlarge the ground electrode 51 to form a sufficiently long stub 53. Consequently, the antenna substrate 1 can be miniaturized.

[0057] In this manner, the antenna substrate 1 can improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 and can also be reduced in size.

[0058] In this embodiment, the ground portion 5 includes a plurality of stubs 53 , namely, four stubs 53 - 1 to 53 - 4 .

[0059] First, the structure of the stub 53 will be described. Figure 3 As shown, stubs 53 - 1 , 53 - 2 , 53 - 3 , and 53 - 4 have the same structure. Stub 53 is bent. In particular, stub 53 is L-shaped when viewed from the first direction Z. Stub 53 includes conductive paths 531 a and 531 b and a chip component 532 .

[0060] Conductive paths 531a and 531b are formed on substrate 2. Conductive paths 531a and 531b are conductor patterns formed on second major surface 22 of dielectric layer 20. More specifically, conductive path 531a extends from connecting line 52 along third direction Y. Conductive path 531b extends from the distal end of conductive path 531a along second direction X. Conductive paths 531a and 531b are linear.

[0061] In the short stubs 53-1 and 53-2, the conductive path 531a extends from the first side 52a of the connection line 52 in the direction opposite to the third direction Y. The conductive path 531a is not directly connected to the connection line 52. In the short stubs 53-1 and 53-2, the conductive path 531b extends from the end ( Figure 3 The upper end in the middle extends in a direction opposite to the second direction X.

[0062] In the stubs 53-3 and 53-4, the conductive path 531a extends from the second side 52b of the connection line 52 in the third direction Y. The conductive path 531a is not directly connected to the connection line 52. The conductive path 531b extends from the end ( Figure 3 The lower end in the middle extends in the second direction X.

[0063] The physical lengths of the conductive paths 531a and 531b are appropriately set based on the target electrical length of the stub 53. In this embodiment, the physical length of the conductive path 531a is shorter than the physical length of the conductive path 531b. In particular, the physical length of the conductive path 531a is set so that the stub 53 is positioned inside the first ground electrode 51 in the third direction Y when viewed from the second direction X. More specifically, the stubs 53-1 and 53-2 are positioned in the third direction Y between the side of the connection line 52 connected to the stubs 53-1 and 53-2 (the first side 52a) and the side of the first ground electrode 51 on the same side as the side (the first side 51a). The stubs 53-3 and 53-4 are interposed between the side (second side 52b) of the connection line 52 connected to the stubs 53-3 and 53-4 and the side (second side 51b) of the first ground electrode 51 on the same side as the side (second side 52b) in the third direction Y. This structure enables miniaturization of the substrate 2 in the third direction Y.

[0064] The chip component 532 is mounted on the substrate 2. The chip component 532 is mounted on the second main surface 22 of the dielectric layer 20. The chip component 532 is located between the conductive path 531a and the connecting line 52. That is, the chip component 532 is mounted on the substrate 2 in a manner that connects the conductive path 531a and the connecting line 52. The chip component 532 includes at least one of an inductor, a capacitor, and a 0Ω resistor. This structure can facilitate the setting of the resonant frequency of the stub 53. That is, even without changing the physical length of the conductive paths 531a and 531b, the electrical length of the stub 53 can be adjusted by appropriately changing the chip component 532. The structure in which the chip component 532 is located between the conductive path 531a and the connecting line 52 can further facilitate the setting of the resonant frequency of the stub 53.

[0065] In each stub 53, the conductive path 531b is along the second direction X. That is, at least a portion of the stub 53 is along the second direction X. The portion of the stub 53 along the second direction X (the conductive path 531b) can generate capacitance with the connecting line 52. The capacitance generated between the stub 53 and the connecting line 52 can affect the resonant frequency of the stub 53. If the portion of the stub 53 along the second direction X becomes longer or the distance between the portion of the stub 53 along the second direction X and the connecting line 52 becomes shorter, the capacitance generated between the stub 53 and the connecting line 52 may increase. If the capacitance generated between the stub 53 and the connecting line 52 increases, even if the electrical length of the stub 53 remains the same, a tendency for the resonant frequency to increase can be seen. Therefore, this structure can shorten the electrical length of the stub 53 required to set the resonant frequency of the stub 53 to the target resonant frequency.

[0066] Next, the arrangement of the stub 53 will be described.

[0067] The grounding portion 5 includes a plurality of short stubs 53, namely, four short stubs 53-1 to 53-4. The short stubs 53-1 and 53-2 are connected to the first side 52a of the connection line 52, and the short stubs 53-3 and 53-4 are connected to the second side 52b of the connection line 52. Hereinafter, the short stub connected to the first side 52a may be referred to as the first short stub, and the short stub connected to the second side 52b may be referred to as the second short stub. Figure 3 In the embodiment, stubs 53-1 and 53-2 are first stubs, and stubs 53-3 and 53-4 are second stubs. This structure can improve the electrical symmetry of the antenna substrate 1, and contribute to improving the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 and the antenna characteristics.

[0068] As described above, the connecting line 52 has a shape that is line-symmetrical with respect to a line passing through the center C3 of the first radiation electrode 3 and parallel to the second direction X. Therefore, the distribution of current flowing through the connecting line 52 tends to be line-symmetrical with respect to a line passing through the center C5 of the connecting line 52 and parallel to the second direction X. This facilitates the equal flow of current through the first and second stubs. Consequently, the isolation characteristics between the first and second radiation electrodes 3 and 4 can be further improved. In this embodiment, the connecting line 52 has a shape that is line-symmetrical with respect to a line passing through the center C3 of the first radiation electrode 3 and parallel to the second direction X. This facilitates the equal flow of current through the first and second stubs.

[0069] The number of first short stubs is 2. The number of second short stubs is 2. The number of first short stubs is equal to the number of second short stubs. This structure can improve the electrical symmetry of antenna substrate 1, contributing to improvements in isolation characteristics between first radiation electrode 3 and second radiation electrode 4 and antenna characteristics.

[0070] The first connection positions of the one or more first short stubs 53-1 and 53-2 to the connection line 52 and the second connection positions of the one or more second short stubs 53-3 and 53-4 to the connection line 52 are different in the second direction X. More specifically, the first connection positions of the short stubs 53-1 and 53-2 to the connection line 52 (the positions of the chip components 532 of the short stubs 53-1 and 53-2) and the second connection positions of the short stubs 53-3 and 53-4 to the connection line 52 (the positions of the chip components 532 of the short stubs 53-3 and 53-4) are different in the second direction X. If the first connection position and the second connection position coincide with each other in the second direction X, there is a possibility that the current flowing from the first side 52a of the connection line 52 toward the second short stubs 53-3 and 53-4 and the current flowing from the second side 52b of the connection line 52 toward the first short stubs 53-1 and 53-2 cancel each other out, thereby reducing the amount of current flowing into the short stub 53. Figure 3 In the example, the first connection position and the second connection position are different in the second direction X. This structure allows current to flow efficiently from the first side 52a of the connection line 52 to the first stubs 53-1 and 53-2, and from the second side 52b of the connection line 52 to the second stubs 53-3 and 53-4. Consequently, this structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. The first connection position and the second connection position are point-symmetrical with respect to the center C5 of the connection line 52 as viewed from the first direction Z. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0071] Two or more of the four short stubs 53-1 to 53-4 are connected to the same side (first side 52a) of the connection line 52 and are arranged along the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. The remaining two or more of the four short stubs 53-1 to 53-4 are connected to the other side (second side 52b) of the connection line 52 and are arranged along the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0072] The interval W1 between the two or more short stubs 53 in the second direction X is larger than the width W2 of the two or more short stubs 53. Figure 3 In the second direction X, the interval W1 between the short stubs 53-3 and 53-4 is larger than the width W2 of each short stub 53-3 and 53-4. Here, the width W2 of each short stub 53-3 and 53-4 is the width of the conductive path 531a. The width of the conductive path 531a may also be equal to the width of the conductive path 531b. Figure 3 Although not explicitly shown in the figure, the spacing between the short stubs 53-1 and 53-2 in the second direction X is also greater than the width of each short stub 53-1 and 53-2. This structure can reduce performance degradation caused by interaction (e.g., capacitive coupling) between two or more short stubs 53 in the second direction X. This further improves the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0073] The first feeding point 61 is a feeding point for the first radiation electrode 3. The first feeding point 61 is used to supply a high-frequency signal to the first radiation electrode 3. As an example, the inner conductor of the coaxial cable is connected to the first radiation electrode 3 via the first feeding point 61. Figure 1 As shown, the first feed point 61 is a through-hole wiring that penetrates the dielectric layer 20 of the substrate 2. The first end of the first feed point 61 is exposed to the first main surface 21 of the dielectric layer 20 and is connected to the first radiation electrode 3. The second end of the first feed point 61 is exposed to the second main surface 22 of the dielectric layer 20, but is not connected to the first ground electrode 51. Figure 3 In the embodiment, the first ground electrode 51 has an opening 51c around the first feed point 61 on the second main surface 22, spaced apart from the first feed point 61. In this embodiment, when viewed from the first direction Z, the center C3 of the first radiation electrode 3 and the first feed point 61 (the feed point of the first radiation electrode 3) are aligned along the second direction X. This configuration allows the direction for adjusting the size of the first radiation electrode 3 according to the frequency band of wireless communication using the first radiation electrode 3 to be the second direction X, rather than the third direction Y. Therefore, this configuration allows for miniaturization of the substrate 2 in the third direction Y.

[0074] The second feeding point 62 is a feeding point for the second radiation electrode 4. The second feeding point 62 is used to supply a high-frequency signal to the second radiation electrode 4. As an example, the inner conductor of the coaxial cable is connected to the second radiation electrode 4 via the second feeding point 62. Figure 1 As shown, the second feed point 62 is a through-hole wiring that penetrates the dielectric layer 20 of the substrate 2. The first end of the second feed point 62 is exposed to the first main surface 21 of the dielectric layer 20 and is connected to the second radiation electrode 4. The second end of the second feed point 62 is exposed to the second main surface 22 of the dielectric layer 20, but is not connected to the second ground electrode 54. Figure 3In the embodiment, the second ground electrode 54 has an opening 54c around the second feed point 62 on the second main surface 22, spaced apart from the second feed point 62. In this embodiment, when viewed from the first direction Z, the center C4 of the second radiation electrode 4 and the second feed point 62 (the feed point of the second radiation electrode 4) are aligned along the second direction X. This configuration allows the direction for adjusting the size of the second radiation electrode 4 according to the frequency band of wireless communication using the second radiation electrode 4 to be the second direction X, rather than the third direction Y. Therefore, this configuration allows for miniaturization of the substrate 2 in the third direction Y.

[0075] exist Figure 3 In the figure, the first feed point 61 is located on the side opposite to the second direction X relative to the center C3 of the first radiation electrode 3, and the second feed point 62 is located on the side opposite to the second direction X relative to the center C4 of the second radiation electrode 4. In other words, the first feed point 61 and the second feed point 62 are located on the same side relative to the center of the corresponding radiation electrode. The first feed point 61 and the second feed point 62 may also be located on opposite sides relative to the center of the corresponding radiation electrode. As an example, the second feed point 62 may be located on the side opposite to the center C4 of the second radiation electrode 4 in the second direction X. The positional relationship between each feed point and the center of the corresponding radiation electrode is not particularly limited and can be appropriately set based on the wavelength length corresponding to the frequency band of wireless communication using the radiation electrodes and the distance between the radiation electrodes. However, to prevent noise generation, the feed points are positioned so as not to overlap with the positions of n-fold waves (n is an integer greater than 2), such as the doubled and tripled waves of the aforementioned wavelength, on the radiation electrode.

[0076] like Figure 1 As shown, electronic components 11 and 12 are mounted on antenna substrate 1. More specifically, electronic components 11 and 12 are arranged on protective layer 23 of substrate 2 of antenna substrate 1. Electronic component 11 is, for example, a processing circuit including an IC. An example of a processing circuit is a SiP (System in Package). Electronic component 11 performs, for example, processing for wireless communication using antenna substrate 1. Electronic component 11 is connected to first and second power feed points 61 and 62. Electronic component 11 can output high-frequency signals to first and second radiation electrodes 3 and 4 via first and second power feed points 61 and 62. Electronic component 11 can receive high-frequency signals from first and second radiation electrodes 3 and 4 via first and second power feed points 61 and 62. Electronic component 12 is, for example, a connector. Electronic component 12 is used to connect antenna module 10 to external devices (such as control circuits of equipment equipped with antenna module 10).

[0077] [1.1.2 Effects, etc.]

[0078] The antenna substrate 1 described above includes: a substrate 2; a planar first radiation electrode 3 disposed on the substrate 2; a second radiation electrode 4 disposed on the substrate 2, spatially separated from the first radiation electrode 3 in the second direction X when viewed in a first direction Z along the thickness of the substrate 2; and a ground portion 5 disposed on the substrate 2 and shared by the first and second radiation electrodes 3 and 4. The ground portion 5 includes a ground electrode 51 that faces the first radiation electrode 3 when viewed in the first direction Z; a connecting line 52 that is located between the first and second radiation electrodes 3 and 4 when viewed in the first direction Z and has a smaller dimension than the ground electrode 51 in a third direction Y perpendicular to the second direction X when viewed in the first direction Z; and a stub 53 connected to one of the first side 52a and the second side 52b of the connecting line 52 that face each other in the third direction Y. This structure improves the isolation characteristics between the first and second radiation electrodes 3 and 4 while also enabling miniaturization.

[0079] In the antenna substrate 1 , the connection line 52 is smaller than the first radiation electrode 3 in the third direction Y. This structure can achieve miniaturization of the substrate 2 in the third direction Y.

[0080] In the antenna substrate 1, the ground portion 5 includes a plurality of stubs 53. The plurality of stubs 53 include one or more first stubs 53-1 and 53-2 connected to the first side 52a of the connecting line 52, and one or more second stubs 53-3 and 53-4 connected to the second side 53b of the connecting line 52. This structure can improve the electrical symmetry of the antenna substrate 1, contributing to improvements in isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4, and in antenna characteristics.

[0081] In the antenna substrate 1, the number of the at least one first stub 53-1, 53-2 is equal to the number of the at least one second stub 53-3, 53-4. This structure improves the electrical symmetry of the antenna substrate 1, contributing to improvements in isolation between the first radiation electrode 3 and the second radiation electrode 4 and in antenna characteristics.

[0082] In the antenna substrate 1, the first connection positions of the one or more first stubs 53-1 and 53-2 to the connection line 52 and the second connection positions of the one or more second stubs 53-3 and 53-4 to the connection line 52 are different in the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0083] In the antenna substrate 1 , the first connection position and the second connection position are point-symmetrical with respect to the center C5 of the connection line 52 viewed from the first direction Z. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 .

[0084] In antenna substrate 1, stub 53 includes one or more conductive paths 531a and 531b formed on substrate 2 and one or more chip components 532 mounted on substrate 2. The one or more chip components 532 include at least one of an inductor, a capacitor, and a 0Ω resistor. This structure facilitates setting the resonant frequency of stub 53.

[0085] In the antenna substrate 1 , at least one of the one or more chip components 532 is located between the one or more conductive paths 531 a and 531 b and the connection line 52 . This structure can further facilitate the setting of the resonant frequency of the stub 53 .

[0086] In the antenna substrate 1 , at least a portion 531 b of the stub 53 extends along the second direction X. This configuration can shorten the electrical length of the stub 53 required to set the resonant frequency of the stub 53 to a target resonant frequency.

[0087] In the antenna substrate 1 , the center C3 of the first radiation electrode 3 and the center C5 of the connection line 52 are aligned along the second direction X when viewed from the first direction Z. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 .

[0088] In the antenna substrate 1 , the connection line 52 has a shape that is line-symmetrical with respect to a line passing through the center C3 of the first radiation electrode 3 and parallel to the second direction X when viewed from the first direction Z. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 .

[0089] In the antenna substrate 1 , the center C3 of the first radiation electrode 3 and the feeding point 61 of the first radiation electrode 3 are aligned along the second direction X when viewed from the first direction Z. This structure enables miniaturization of the substrate 2 in the third direction Y.

[0090] In the antenna substrate 1 , the center C4 of the second radiation electrode 4 and the feeding point 62 of the second radiation electrode 4 are aligned along the second direction X when viewed from the first direction Z. This structure enables miniaturization of the substrate 2 in the third direction Y.

[0091] In the antenna substrate 1, the ground portion 5 includes a plurality of stubs 53. Two or more stubs 53-1 and 53-2 of the plurality of stubs 53 are connected to the first side 52a of the connection line 52 and are arranged along the second direction X. Two or more stubs 53-3 and 53-4 of the plurality of stubs 53 are connected to the second side 52b of the connection line 52 and are arranged along the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0092] In the antenna substrate 1 , the interval W1 between the two or more stubs 53 in the second direction X is larger than the width W2 of the two or more stubs 53 . This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 .

[0093] In the antenna substrate 1, the second radiation electrode 4 is planar, the ground electrode 51 is the first ground electrode 51, the ground portion 5 includes a second ground electrode 54 that faces the second radiation electrode 4 when viewed in the first direction Z, and the connecting line 52 connects the first ground electrode 51 and the second ground electrode 54. This structure can improve the electrical symmetry of the antenna substrate 1, contributing to improvements in isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 and antenna characteristics.

[0094] In the antenna substrate 1, the second direction X is the longitudinal direction of the substrate 2, and the third direction Y is the width direction of the substrate 2. This structure enables miniaturization of the substrate 2.

[0095] The antenna module 10 described above includes an antenna substrate 1 and electronic components 11 and 12 mounted on the antenna substrate 1. This structure can improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 while also enabling miniaturization.

[0096] [1.2 Implementation Method 2]

[0097] [1.2.1 Structure]

[0098] Figure 4 This is a bottom view of an example configuration of an antenna substrate 1A according to Embodiment 2. Antenna substrate 1A can be used in antenna module 10 instead of antenna substrate 1. Antenna substrate 1A includes substrate 2, first radiation electrode 3, second radiation electrode 4, ground portion 5A, first feed point 61, and second feed point 62.

[0099] The ground portion 5A includes a ground electrode 51 , a connection line 52 , and a plurality of stubs 53A- 1 to 53A- 4 (hereinafter sometimes collectively referred to as 53A). The ground portion 5A also includes a second ground electrode 54 different from the first ground electrode 51 .

[0100] The stub 53A is connected to one of the first side 52 a and the second side 52 b of the connection line 52 , which are opposite to each other in the third direction Y.

[0101] First, the structure of stub 53A will be described. Stubs 53A-1, 53A-2, 53A-3, and 53A-4 have the same structure. Stub 53A has a bent shape. In particular, stub 53A is L-shaped when viewed from the first direction Z. Stub 53A includes conductive paths 531a and 531b. Unlike stub 53, stub 53A does not include chip component 532. This structure simplifies the construction of stub 53A.

[0102] In the short stubs 53A-1 and 53A-2, the conductive path 531a extends from the first side 52a of the connection line 52 in the direction opposite to the third direction Y. The conductive path 531a is directly connected to the connection line 52. In the short stubs 53A-1 and 53A-2, the conductive path 531b extends from the end ( Figure 4 The upper end in the middle extends in a direction opposite to the second direction X.

[0103] In the stubs 53A-3 and 53A-4, the conductive path 531a extends from the second side 52b of the connection line 52 in the third direction Y. The conductive path 531a is directly connected to the connection line 52. The conductive path 531b extends from the end ( Figure 4 The lower end in the middle extends in the second direction X.

[0104] The physical lengths of the conductive paths 531a and 531b are appropriately set based on the target electrical length of the stub 53A. In this embodiment, the physical length of the conductive path 531a is shorter than the physical length of the conductive path 531b. In particular, in this embodiment, the physical length of the conductive path 531a is set so that the stub 53A is positioned inside the first ground electrode 51 in the third direction Y when viewed from the second direction X. This structure enables miniaturization of the substrate 2 in the third direction Y.

[0105] In each stub 53A, the conductive path 531b extends along the second direction X. That is, at least a portion of the stub 53A extends along the second direction X. This configuration can shorten the electrical length of the stub 53 required to set the resonant frequency of the stub 53 to the target resonant frequency.

[0106] Next, the arrangement of the stub 53A will be described.

[0107] Stubs 53A-1 and 53A-2 are connected to the first side 52a of the connecting line 52, while stubs 53A-3 and 53A-4 are connected to the second side 52b of the connecting line 52. Stubs 53A-1 and 53A-2 are first stubs, while stubs 53A-3 and 53A-4 are second stubs. This structure improves the electrical symmetry of the antenna substrate 1A, contributing to improvements in isolation between the first radiation electrode 3 and the second radiation electrode 4, as well as antenna characteristics. The number of first stubs is two. The number of second stubs is two. The number of first and second stubs is equal. This structure improves the electrical symmetry of the antenna substrate 1A, contributing to improvements in isolation between the first radiation electrode 3 and the second radiation electrode 4, as well as antenna characteristics.

[0108] The first connection points of the one or more first stubs 53A-1 and 53A-2 to the connection line 52 and the second connection points of the one or more second stubs 53A-3 and 53A-4 to the connection line 52 are different in the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. The first connection point and the second connection point are point-symmetrical with respect to the center C5 of the connection line 52 as viewed in the first direction Z. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0109] Two or more of the four stubs 53A-1 to 53A-4, 53A-1 and 53A-2, are connected to the same side (first side 52a) of the connection line 52 and are arranged along the second direction X. This configuration can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. The remaining two or more of the four stubs 53A-1 to 53A-4, 53A-3 and 53A-4, are connected to the other side (second side 52b) of the connection line 52 and are arranged along the second direction X. This configuration can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0110] The interval W1 between the two or more short stubs 53A in the second direction X is larger than the width W2 of the two or more short stubs 53A. Figure 4 In the second direction X, the interval W1 between the short stubs 53A-3 and 53A-4 is larger than the width W2 of each short stub 53A-3 and 53A-4. Here, the width W2 of each short stub 53A-3 and 53A-4 is the width of the conductive path 531a. The width of the conductive path 531a may also be equal to the width of the conductive path 531b. Figure 4Although not explicitly shown in the figure, the interval between the stubs 53A- 1 and 53A- 2 in the second direction X is also larger than the width of each stub 53A- 1 and 53A- 2 . This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 .

[0111] [1.2.2 Effects, etc.]

[0112] The antenna substrate 1A described above includes: a substrate 2; a planar first radiation electrode 3 disposed on the substrate 2; a second radiation electrode 4 disposed on the substrate 2, spatially separated from the first radiation electrode 3 in the second direction X when viewed in a first direction Z along the thickness of the substrate 2; and a ground portion 5A disposed on the substrate 2 and shared by the first and second radiation electrodes 3 and 4. The ground portion 5A includes a ground electrode 51 that faces the first radiation electrode 3 when viewed in the first direction Z; a connecting line 52 that is located between the first and second radiation electrodes 3 and 4 when viewed in the first direction Z and has a smaller dimension than the ground electrode 51 in a third direction Y perpendicular to the second direction X when viewed in the first direction Z; and a stub 53A connected to one of the first side 52a and the second side 52b of the connecting line 52, which face each other in the third direction Y. This structure improves the isolation characteristics between the first and second radiation electrodes 3 and 4.

[0113] [1.3 Implementation Method 3]

[0114] [1.3.1 Structure]

[0115] Figure 5 This is a bottom view of an example structure of an antenna substrate 1B according to Embodiment 3. Antenna substrate 1B can be used in antenna module 10 instead of antenna substrate 1. Antenna substrate 1B includes substrate 2, first radiation electrode 3, second radiation electrode 4, ground portion 5B, first feed point 61, and second feed point 62.

[0116] The ground portion 5B includes a first ground electrode 51 , a connection line 52 , and a plurality of stubs 53B- 1 to 53B- 4 (hereinafter sometimes collectively referred to as 53B). The ground portion 5B also includes a second ground electrode 54 different from the first ground electrode 51 .

[0117] The stub 53B is connected to one of the first side 52 a and the second side 52 b of the connection line 52 , which are opposed to each other in the third direction Y.

[0118] First, the structure of stub 53B will be described. Stubs 53B- 1 , 53B- 2 , 53B- 3 , and 53B- 4 have the same structure. Stub 53B is straight and unbent. Stub 53B includes a conductive path 531 c and a chip component 532 .

[0119] The conductive path 531c is formed on the substrate 2. The conductive path 531c is a conductor pattern formed on the second main surface 22 of the dielectric layer 20. More specifically, the conductive path 531c is linear and extends along the third direction Y.

[0120] In stubs 53B-1 and 53B-2, conductive path 531c extends from first side 52a of connection line 52 in a direction opposite to third direction Y. Conductive path 531c is not directly connected to connection line 52. In stubs 53B-3 and 53B-4, conductive path 531c extends from second side 52b of connection line 52 in third direction Y. Conductive path 531c is not directly connected to connection line 52.

[0121] Chip component 532 is mounted on substrate 2. Chip component 532 is mounted on second main surface 22 of dielectric layer 20. In this embodiment, chip component 532 is located between conductive path 531c and connecting line 52. In other words, chip component 532 is mounted on substrate 2 so as to connect conductive path 531c and connecting line 52.

[0122] In each stub 53B, the conductive path 531c extends along the third direction Y. Figure 5 In the embodiment shown in FIG. 1 , stub 53B is positioned inside first ground electrode 51 in the third direction Y when viewed from the second direction X. Therefore, assuming the electrical length of stub 53B is the same as the electrical length of stub 53, the dimension of substrate 2 of antenna substrate 1B in the third direction is larger than the dimension of substrate 2 of antenna substrate 1 in the third direction. On the other hand, stub 53B is straight, not bent, and therefore may have better electrical characteristics than stub 53.

[0123] Next, the arrangement of the stub 53B will be described.

[0124] Stubs 53B-1 and 53B-2 are connected to the first side 52a of the connecting line 52, while stubs 53B-3 and 53B-4 are connected to the second side 52b of the connecting line 52. Stubs 53B-1 and 53B-2 are first stubs, while stubs 53B-3 and 53B-4 are second stubs. This structure improves the electrical symmetry of the antenna substrate 1B, contributing to improved isolation between the first radiation electrode 3 and the second radiation electrode 4, as well as antenna characteristics. The number of first stubs is two. The number of second stubs is two. The number of first and second stubs is equal. This structure improves the electrical symmetry of the antenna substrate 1B, contributing to improved isolation between the first radiation electrode 3 and the second radiation electrode 4, as well as antenna characteristics.

[0125] The first connection points of the one or more first stubs 53B-1 and 53B-2 to the connection line 52 and the second connection points of the one or more second stubs 53B-3 and 53B-4 to the connection line 52 are different in the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. The first connection point and the second connection point are point-symmetrical with respect to the center C5 of the connection line 52 as viewed in the first direction Z. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0126] Two or more of the four stubs 53B-1 to 53B-4, 53B-1 and 53B-2, are connected to the same side (first side 52a) of the connection line 52 and are arranged along the second direction X. This configuration can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. The remaining two or more of the four stubs 53B-1 to 53B-4, 53B-3 and 53B-4, are connected to the other side (second side 52b) of the connection line 52 and are arranged along the second direction X. This configuration can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0127] The interval W1 between the two or more short stubs 53B in the second direction X is larger than the width W2 of the two or more short stubs 53B. Figure 5 In the second direction X, the interval W1 between the short stubs 53B-3 and 53B-4 is larger than the width W2 of each short stub 53B-3 and 53B-4. Here, the width W2 of each short stub 53B-3 and 53B-4 is the width of the conductive path 531c. Figure 5 Although not explicitly shown in the figure, the interval between the stubs 53B- 1 and 53B- 2 in the second direction X is also larger than the width of each stub 53B- 1 and 53B- 2 . This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 .

[0128] [1.3.2 Effects, etc.]

[0129] The antenna substrate 1B described above includes: a substrate 2; a planar first radiation electrode 3 disposed on the substrate 2; a second radiation electrode 4 disposed on the substrate 2, spatially separated from the first radiation electrode 3 in the second direction X when viewed in a first direction Z along the thickness of the substrate 2; and a ground portion 5B disposed on the substrate 2 and shared by the first and second radiation electrodes 3 and 4. The ground portion 5B includes: a ground electrode 51 that faces the first radiation electrode 3 when viewed in the first direction Z; a connecting line 52 that is located between the first and second radiation electrodes 3 and 4 when viewed in the first direction Z and has a smaller dimension than the ground electrode 51 in a third direction Y perpendicular to the second direction X when viewed in the first direction Z; and a stub 53B connected to one of the first side 52a and the second side 52b of the connecting line 52, which face each other in the third direction Y. This structure improves the isolation characteristics between the first and second radiation electrodes 3 and 4.

[0130] [1.4 Implementation Method 4]

[0131] [1.4.1 Structure]

[0132] Figure 6 This is a bottom view of an example structure of an antenna substrate 1C according to Embodiment 4. Antenna substrate 1C can be used in antenna module 10 instead of antenna substrate 1. Antenna substrate 1C includes substrate 2, first radiation electrode 3, second radiation electrode 4, ground portion 5C, first feed point 61, and second feed point 62.

[0133] The ground portion 5C includes a first ground electrode 51 , a connection line 52 , and a plurality of stubs 53C- 1 to 53C- 6 (hereinafter sometimes collectively referred to as 53C). The ground portion 5B also includes a second ground electrode 54 different from the first ground electrode 51 .

[0134] The stub 53C is connected to one of the first side 52 a and the second side 52 b of the connection line 52 , which are opposed to each other in the third direction Y.

[0135] First, the structure of the short stub 53C will be described. The short stubs 53C-1, 53C-2, 53C-3, 53C-4, 53C-5, and 53C-6 have the same structure. The short stub 53C is bent. In particular, the short stub 53C is L-shaped when viewed from the first direction Z. Figure 3 The stub 53 also includes conductive paths 531 a , 531 b and a chip component 532 .

[0136] Two or more of the two or more stubs 53C have different electrical lengths. This structure can improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 over a wider frequency band. The stubs 53C-1, 53C-3, 53C-4, and 53C-6 have different electrical lengths from the stubs 53C-2 and 53C-5. The electrical lengths of the stubs 53C-1, 53C-3, 53C-4, and 53C-6 are set to be the same as the electrical length of the stub 53 of the antenna substrate 1. The antenna substrate 1C can also attenuate high-frequency signals on the connecting line 52 near the resonant frequency of the stubs 53C-2 and 53C-5, which are different from the stub 53. Therefore, the antenna substrate 1C can improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 over a wider frequency band than the frequency band of the antenna substrate 1.

[0137] Next, the arrangement of the stub 53C will be described.

[0138] Stubs 53C-1, 53C-2, and 53C-3 are connected to the first side 52a of the connecting line 52, while stubs 53C-4, 53C-5, and 53C-6 are connected to the second side 52b of the connecting line 52. Stubs 53C-1, 53C-2, and 53C-3 are first stubs, while stubs 53C-4, 53C-5, and 53C-6 are second stubs. This structure improves the electrical symmetry of the antenna substrate 1C, contributing to improved isolation between the first radiation electrode 3 and the second radiation electrode 4, as well as antenna characteristics. The number of first stubs is three. The number of second stubs is three. The number of first and second stubs is equal. This structure improves the electrical symmetry of the antenna substrate 1C, contributing to improved isolation between the first radiation electrode 3 and the second radiation electrode 4, as well as antenna characteristics.

[0139] The first connection points of one or more first stubs 53C-1, 53C-2, and 53C-3 to the connection line 52 and the second connection points of one or more second stubs 53C-4, 53C-5, and 53C-6 to the connection line 52 are different in the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. The first connection point and the second connection point are point-symmetrical with respect to the center C5 of the connection line 52 as viewed in the first direction Z. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0140] Two or more of the six stubs 53C-1 to 53C-6 are connected to the same side (first side 52a) of the connection line 52 and are arranged along the second direction X. This configuration further improves the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. The remaining two or more of the six stubs 53C-1 to 53C-6 are connected to the other side (second side 52b) of the connection line 52 and are arranged along the second direction X. This configuration further improves the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0141] The interval W1 between two or more short stubs 53C in the second direction X is greater than the width W2 of the two or more short stubs 53C. The interval W1 between the short stubs 53C-4 and 53C-5 in the second direction X is greater than the width W2 of each short stub 53C-4 and 53C-5. Here, the width W2 of each short stub 53C-4 and 53C-5 is the width of the conductive path 531a. The width of the conductive path 531a may also be equal to the width of the conductive path 531b. Figure 6 Although not explicitly shown in the figure, the intervals between the other stubs 53C in the second direction X are also larger than the width of each stub 53C. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0142] [1.4.2 Effects, etc.]

[0143] The antenna substrate 1C described above includes: a substrate 2; a planar first radiation electrode 3 disposed on the substrate 2; a second radiation electrode 4 disposed on the substrate 2, spatially separated from the first radiation electrode 3 in the second direction X when viewed in a first direction Z along the thickness of the substrate 2; and a ground portion 5C disposed on the substrate 2 and shared by the first radiation electrode 3 and the second radiation electrode 4. The ground portion 5C includes a ground electrode 51 that faces the first radiation electrode 3 when viewed in the first direction Z; a connecting line 52 that is located between the first radiation electrode 3 and the second radiation electrode 4 when viewed in the first direction Z and has a smaller dimension than the ground electrode 51 in a third direction Y perpendicular to the second direction X when viewed in the first direction Z; and a stub 53C connected to one of the first side 52a and the second side 52b of the connecting line 52, which face each other in the third direction Y. This structure improves the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0144] In the antenna substrate 1C, two or more of the two or more stubs 53C have different electrical lengths. This structure can improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 in a wider frequency band.

[0145] [1.5 Implementation Method 5]

[0146] [1.5.1 Structure]

[0147] Figure 7 This is a bottom view of an example structure of an antenna substrate 1D according to Embodiment 5. Antenna substrate 1D can be used in antenna module 10 instead of antenna substrate 1. Antenna substrate 1D includes substrate 2, first radiation electrode 3, second radiation electrode 4, ground portion 5D, first feed point 61, and second feed point 62.

[0148] The ground portion 5D includes a ground electrode 51 , a connection line 52 , and a plurality of stubs 53D- 1 to 53D- 4 (hereinafter sometimes collectively referred to as 53D). The ground portion 5D also includes a second ground electrode 54 different from the first ground electrode 51 .

[0149] The stub 53D is connected to one of the first side 52 a and the second side 52 b of the connection line 52 , which are opposite to each other in the third direction Y.

[0150] First, the structure of stub 53D will be described. Stubs 53D- 1 , 53D- 2 , 53D- 3 , and 53D- 4 have the same structure. Stub 53D is bent. Stub 53D includes conductive paths 531 a and 531 d and a chip component 532 .

[0151] Conductive paths 531a and 531d are formed on the substrate 2. The conductive paths 531a and 531d are conductor patterns formed on the second main surface 22 of the dielectric layer 20. In more detail, the conductive path 531a extends from the connecting line 52 along the third direction Y. The conductive path 531b extends from the end of the conductive path 531d along the second direction X. The conductive path 531a is straight. The conductive path 531d is a shape that is bent more than once. The conductive path 531d is a shape that is serpentine with respect to the second direction X. In the short stubs 53D-1 and 53D-2, the conductive path 531a extends from the first side 52a of the connecting line 52 in the direction opposite to the third direction Y. The conductive path 531a is not directly connected to the connecting line 52. In the short stubs 53D-1 and 53D-2, the conductive path 531d extends from the end ( Figure 7 The conductive path 531a extends from the second side 52b of the connecting line 52 in the direction opposite to the second direction X. In the stubs 53D-3 and 53D-4, the conductive path 531a extends from the second side 52b of the connecting line 52 in the third direction Y. The conductive path 531a is not directly connected to the connecting line 52. The conductive path 531d extends from the end ( Figure 7 The lower end in the middle extends in the second direction X.

[0152] The physical lengths of the conductive paths 531a and 531d are appropriately set according to the target electrical length of the stub 53D. The physical length of the conductive path 531a is shorter than the physical length of the conductive path 531d. In particular, the physical length of the conductive path 531a is set so that the stub 53D is placed inside the first ground electrode 51 in the third direction Y when viewed from the second direction X. This structure can achieve miniaturization of the substrate 2 in the third direction Y. The conductive path 531d is connected to the conductive path 531d. Figure 3 The conductive path 531b of FIG. 5 extends in the second direction X in the same manner, but is different from the linear conductive path 531b in that it is bent more than once. Figure 7 The conductive path 531d is connected to Figure 3 If the conductive path 531b has the same physical length as the conductive path 531d, the length of the conductive path 531d in the second direction X can be made larger than Figure 3 The length of the conductive path 531b in the second direction X is short. Therefore, this structure can shorten the maximum length of one side of the region required for disposing the stub 53D.

[0153] The conductive path 531d extends along the second direction X. In other words, at least a portion of the stub 53D extends along the second direction X. The portion of the stub 53D extending along the second direction X (the portion of the conductive path 531d on the connection line 52 side) can generate capacitance with the connection line 52. Therefore, this configuration can shorten the electrical length of the stub 53D required to set the resonant frequency of the stub 53D to the desired resonant frequency.

[0154] The chip component 532 is mounted on the substrate 2. The chip component 532 is mounted on the second main surface 22 of the dielectric layer 20. In this embodiment, the chip component 532 is located between the conductive path 531a and the connecting line 52.

[0155] Next, the arrangement of the stub 53D will be described.

[0156] Stubs 53D-1 and 53D-2 are connected to the first side 52a of the connecting line 52, while stubs 53D-3 and 53D-4 are connected to the second side 52b of the connecting line 52. Stubs 53D-1 and 53D-2 are first stubs, while stubs 53D-3 and 53D-4 are second stubs. This structure improves the electrical symmetry of the antenna substrate 1D, contributing to improved isolation between the first radiation electrode 3 and the second radiation electrode 4, as well as antenna characteristics. The number of first stubs is two. The number of second stubs is two. The number of first and second stubs is equal. This structure improves the electrical symmetry of the antenna substrate 1D, contributing to improved isolation between the first radiation electrode 3 and the second radiation electrode 4, as well as antenna characteristics.

[0157] The first connection points of the one or more first stubs 53D-1 and 53D-2 to the connection line 52 and the second connection points of the one or more second stubs 53D-3 and 53D-4 to the connection line 52 are different in the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. The first connection point and the second connection point are point-symmetrical with respect to the center C5 of the connection line 52 as viewed in the first direction Z. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0158] Two or more of the four stubs 53D-1 to 53D-4, 53D-1 and 53D-2, are connected to the same side (first side 52a) of the connection line 52 and are arranged along the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. The remaining two or more of the four stubs 53D-1 to 53D-4, 53D-3 and 53D-4, are connected to the other side (second side 52b) of the connection line 52 and are arranged along the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0159] The interval W1 between the two or more short stubs 53D in the second direction X is larger than the width W2 of the two or more short stubs 53D. Figure 7 In the second direction X, the interval W1 between the short stubs 53D-3 and 53D-4 is larger than the width W2 of each short stub 53D-3 and 53D-4. Here, the width W2 of each short stub 53D-3 and 53D-4 is the width of the conductive path 531d. Figure 7 Although not explicitly shown in the figure, the intervals between the other stubs 53D in the second direction X are also larger than the width of each stub 53D. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0160] [1.5.2 Effects, etc.]

[0161] The antenna substrate 1D described above includes: a substrate 2; a planar first radiation electrode 3 disposed on the substrate 2; a second radiation electrode 4 disposed on the substrate 2, spatially separated from the first radiation electrode 3 in the second direction X when viewed in a first direction Z along the thickness of the substrate 2; and a ground portion 5D disposed on the substrate 2 and shared by the first and second radiation electrodes 3 and 4. The ground portion 5D includes a ground electrode 51 that faces the first radiation electrode 3 when viewed in the first direction Z; a connecting line 52 that is located between the first and second radiation electrodes 3 and 4 when viewed in the first direction Z and has a smaller dimension than the ground electrode 51 in a third direction Y perpendicular to the second direction X when viewed in the first direction Z; and a stub 53D connected to one of the first side 52a and the second side 52b of the connecting line 52, which face each other in the third direction. This structure improves the isolation characteristics between the first and second radiation electrodes 3 and 4.

[0162] In the antenna substrate 1D, the stub 53D is bent twice or more. This configuration can shorten the maximum length of one side of the region required for the arrangement of the stub 53D.

[0163] [1.6 Implementation Method 6]

[0164] [1.6.1 Structure]

[0165] Figure 8 It is a perspective view of a structural example of an antenna substrate 1E according to the sixth embodiment. Figure 9 It is a top view of the antenna substrate 1E. Figure 10 1 is a bottom view of the antenna substrate 1E. The antenna substrate 1E can be used in the antenna module 10 instead of the antenna substrate 1.

[0166] like Figure 8 、 Figure 9 as well as Figure 10 As shown, the antenna substrate 1E includes a substrate 2 , a first radiation electrode 3 , a second radiation electrode 4 , a ground portion 5E, a first feed point 61 , and a second feed point 62 .

[0167] like Figures 8 to 10 As shown, the ground portion 5E is provided on the substrate 2. The ground portion 5E includes a ground electrode 51, a connection line 52, and a plurality of stubs 53E-1 to 53E-4 (hereinafter sometimes collectively referred to as 53E). The ground portion 5E also includes a second ground electrode 54 different from the first ground electrode 51.

[0168] The stub 53E is connected to one of the first side 52 a and the second side 52 b of the connection line 52 , which are opposed to each other in the third direction.

[0169] First, the structure of stub 53E will be described. Stubs 53E-1, 53E-2, 53E-3, and 53E-4 have the same structure. Stub 53E has a bent shape. Specifically, stub 53E is L-shaped when viewed from the second direction X and L-shaped when viewed from the third direction Y. Stub 53E includes conductive paths 531e, 531f, and 531g and chip component 532.

[0170] Conductive paths 531e, 531f, and 531g are formed on the substrate 2. Figure 8 and Figure 10 As shown, the conductive path 531e is a conductor pattern formed on the second main surface 22 of the dielectric layer 20. More specifically, the conductive path 531e extends from the connection line 52 along the third direction Y. The conductive path 531e is linear. Figure 8 As shown, the conductive path 531f is a through-hole wiring that penetrates the dielectric layer 20 of the substrate 2. The conductive path 531f extends from the end of the conductive path 531e along a direction intersecting the plane including the second direction X and the third direction Y. In this embodiment, the conductive path 531f extends along the first direction Z. The first end of the conductive path 531f is exposed to the first main surface 21 of the dielectric layer 20 and is connected to the conductive path 531g, and the second end of the conductive path 531f is exposed to the second main surface 22 of the dielectric layer 20 and is connected to the conductive path 531e. Figure 8 and Figure 9 As shown, the conductive path 531g is a conductor pattern formed on the first main surface 21 of the dielectric layer 20. More specifically, the conductive path 531g extends from the first end of the conductive path 531f along the second direction X. The conductive path 531g is linear.

[0171] In the short stubs 53E-1 and 53E-2, the conductive path 531e extends from the first side 52a of the connection line 52 in the direction opposite to the third direction Y. The conductive path 531e is not directly connected to the connection line 52. In the short stubs 53E-1 and 53E-2, the conductive path 531f extends from the end ( Figure 10 The conductive path 531e extends from the first side 52a of the connecting line 52 to the third direction Y. The conductive path 531e is not directly connected to the connecting line 52. In the stubs 53E-3 and 53E-4, the conductive path 531f extends from the end ( Figure 10The conductive path 531g extends in the first direction Z from the first end of the conductive path 531f in the stubs 53E-3 and 53E-4.

[0172] The physical lengths of the conductive paths 531e, 531f, and 531g are appropriately set based on the target electrical length of the stub 53E. The conductive path 531f extends along a direction intersecting a plane including the second direction X and the third direction Y (in this embodiment, the first direction Z). In other words, at least a portion of the stub 53E extends along a direction intersecting a plane including the second direction X and the third direction Y (in this embodiment, the first direction Z). Consequently, the area required for the placement of the stub 53E in the plane including the second direction X and the third direction Y can be reduced, that is, the area required for the placement of the stub 53E when viewed from the first direction Z can be reduced.

[0173] The physical length of the conductive path 531e is shorter than the physical lengths of the conductive paths 531f and 531g. In particular, in this embodiment, the physical length of the conductive path 531e is set so that the stub 53E is located inside the first radiation electrode 3 in the third direction Y when viewed from the second direction X. More specifically, the stubs 53E-1 and 53E-2 are located in the third direction Y between the side of the connecting line 52 connected to the stubs 53E-1 and 53E-2 (the first side 52a) and the side of the first radiation electrode 3 located on the same side as the side (the first side 3a). The stubs 53E-3 and 53E-4 are placed between the side (second side 52b) of the connection line 52 connected to the stubs 53E-3 and 53E-4 and the side (second side 3b) of the first radiation electrode 3 located on the same side as the side (second side 52b) in the third direction Y. This structure enables miniaturization of the substrate 2 in the third direction Y.

[0174] The chip component 532 is mounted on the substrate 2. Figure 10 In the embodiment, the chip component 532 is mounted on the second main surface 22 of the dielectric layer 20. In the present embodiment, the chip component 532 is located between the conductive path 531e and the connecting line 52.

[0175] In each stub 53E, the conductive path 531g extends along the second direction X. That is, at least a portion of the stub 53E extends along the second direction X. This configuration can shorten the electrical length of the stub 53E required to set the resonant frequency of the stub 53E to a target resonant frequency.

[0176] Next, the arrangement of the stub 53E will be described.

[0177] The stubs 53E-1 and 53E-2 are connected to the first side 52a of the connection line 52, and the stubs 53E-3 and 53E-4 are connected to the second side 52b of the connection line 52. Figure 10 In the example, stubs 53E-1 and 53E-2 are first stubs, and stubs 53E-3 and 53E-4 are second stubs. This structure improves the electrical symmetry of the antenna substrate 1E, contributing to improved isolation between the first radiation electrode 3 and the second radiation electrode 4, as well as antenna characteristics. The number of first stubs is two. The number of second stubs is two. The number of first and second stubs is equal. This structure improves the electrical symmetry of the antenna substrate 1E, contributing to improved isolation between the first radiation electrode 3 and the second radiation electrode 4, as well as antenna characteristics.

[0178] The first connection points of the one or more first stubs 53E-1 and 53E-2 to the connection line 52 and the second connection points of the one or more second stubs 53E-3 and 53E-4 to the connection line 52 are different in the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. The first connection point and the second connection point are point-symmetrical with respect to the center C5 of the connection line 52 as viewed in the first direction Z. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0179] Two or more of the four short stubs 53E-1 to 53E-4, 53E-1 and 53E-2, are connected to the same side (first side 52a) of the connection line 52 and are arranged along the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4. The remaining two or more of the four short stubs 53E-1 to 53E-4, 53E-3 and 53E-4, are connected to the other side (second side 52b) of the connection line 52 and are arranged along the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0180] The interval W1 between the two or more short stubs 53E in the second direction X is larger than the width W2 of the two or more short stubs 53E. Figure 10 In the second direction X, the interval W1 between the short stubs 53E-3 and 53E-4 is larger than the width W2 of each short stub 53E-3 and 53E-4. Here, the width W2 of each short stub 53E-3 and 53E-4 is the width of the conductive path 531e. The width of the conductive path 531e can also be equal to the width of the conductive paths 531f and 531g. Figure 10Although not explicitly shown in the figure, the interval between the stubs 53E- 1 and 53E- 2 in the second direction X is also larger than the width of each stub 53E- 1 and 53E- 2 . This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4 .

[0181] [1.6.2 Effects, etc.]

[0182] The antenna substrate 1E described above includes: a substrate 2; a planar first radiation electrode 3 disposed on the substrate 2; a second radiation electrode 4 disposed on the substrate 2, spatially separated from the first radiation electrode 3 in the second direction X when viewed in a first direction Z along the thickness of the substrate 2; and a ground portion 5E disposed on the substrate 2 and shared by the first radiation electrode 3 and the second radiation electrode 4. The ground portion 5E includes: a ground electrode 51 opposing the first radiation electrode 3 when viewed in the first direction Z; a connecting line 52 located between the first radiation electrode 3 and the second radiation electrode 4 when viewed in the first direction Z and having a smaller dimension than the ground electrode 51 in a third direction Y perpendicular to the second direction X when viewed in the first direction Z; and a stub 53E connected to one of the first side 52a and the second side 52b of the connecting line 52, which oppose each other in the third direction Y. This structure improves the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4.

[0183] In the antenna substrate 1E, at least a portion of the stub 53E (conductive path 531f) extends along a direction intersecting a plane including the second direction X and the third direction Y. This structure enables miniaturization of the substrate 2 in the third direction Y.

[0184] In the antenna substrate 1E, the stub 53E is interposed between the sides (first side 52a, second side 52b) of the connecting line 52 connected to the stub 53E and the sides (first side 3a, second side 3b) of the first radiation electrode 3 located on the same side as the sides (first side 52a, second side 52b) in the third direction Y. This structure enables miniaturization of the substrate 2 in the third direction Y.

[0185] [1.7 Implementation Method 7]

[0186] [1.7.1 Structure]

[0187] Figure 11 It is a perspective view of a structural example of an antenna substrate 1F according to the seventh embodiment. Figure 12 It is a top view of the antenna substrate 1F. Figure 13 1F is a bottom view of the antenna substrate 1F. The antenna substrate 1F can be used in the antenna module 10 instead of the antenna substrate 1 .

[0188] like Figure 11 、 Figure 12 as well as Figure 13 As shown, the antenna substrate 1F includes a substrate 2 , a first radiation electrode 3 , a second radiation electrode 4F, a ground portion 5F, a first feed point 61 , a second feed point 62F, and a feed path 63 .

[0189] like Figures 11 to 13 As shown, the first radiation electrode 3 and the second radiation electrode 4F are located on different surfaces of the substrate 2. More specifically, the first radiation electrode 3 is located on the first main surface 21 of the dielectric layer 20 of the substrate 2. The second radiation electrode 4F is located on the second main surface 22 of the dielectric layer 20 of the substrate 2. The first radiation electrode 3 and the second radiation electrode 4F are located on different surfaces of the substrate 2, but are spaced apart in the second direction X. The second radiation electrode 4F is spatially separated from the first radiation electrode 3 in the second direction X when viewed from the first direction Z. The second radiation electrode 4F is located on the opposite side of the connecting line 52F from the first radiation electrode 3 so as not to face the ground portion 5F when viewed from the first direction Z. The first radiation electrode 3 and the second radiation electrode 4F are located at opposite ends of the dielectric layer 20 of the substrate 2 in the second direction X. As described above, the second direction X is the longitudinal direction of the substrate 2, and the third direction Y is the width direction of the substrate 2. This structure enables miniaturization of the substrate 2.

[0190] The second radiation electrode 4F is a conductor pattern formed on the second main surface 22 of the dielectric layer 20. The second radiation electrode 4F is planar. The second radiation electrode 4F is substantially rectangular when viewed from the first direction Z. Figure 13 As shown, the second radiation electrode 4F is line-symmetrical with respect to a line passing through the center C4 of the second radiation electrode 4F and parallel to the second direction X when viewed from the first direction Z. When viewed from the first direction Z, the center C3 of the first radiation electrode 3 and the center C4 of the second radiation electrode 4F are aligned along the second direction X. In other words, the straight line connecting the center C3 of the first radiation electrode 3 and the center C4 of the second radiation electrode 4F is parallel to the second direction X.

[0191] The shapes of the first radiation electrode 3 and the second radiation electrode 4F are determined according to the frequency band used for wireless communication. The first radiation electrode 3 and the second radiation electrode 4F have different shapes.

[0192] The second feed point 62F is a feed point for the second radiation electrode 4F. The second feed point 62F is used to supply a high-frequency signal to the second radiation electrode 4F. As an example, the inner conductor of the coaxial cable is connected to the second radiation electrode 4F via the second feed point 62F. Figure 13 As shown in FIG, the second feed point 62F is located between the first radiation electrode 3 and the second radiation electrode 4F when viewed from the first direction Z. Figures 11 to 13Although schematically shown in FIG. 1 , the second power feeding point 62F is, for example, a protective layer 23 (see FIG. 1 ) that penetrates the second main surface 22 of the dielectric layer 20 covering the substrate 2. Figure 1 The second feed point 62F is connected to the second radiation electrode 4F via a feed path 63. The feed path 63 is a conductor pattern formed on the second main surface 22 of the dielectric layer 20.

[0193] When viewed from the first direction Z, the center C4 of the second radiation electrode 4F and the second feed point 62F (the feed point of the second radiation electrode 4F) are aligned along the second direction X. This configuration allows the direction for adjusting the size of the second radiation electrode 4F according to the frequency band of wireless communication using the second radiation electrode 4F to be the second direction X, rather than the third direction Y. Therefore, this configuration allows for miniaturization of the substrate 2 in the third direction Y. In a configuration where the center C4 of the second radiation electrode 4F and the second feed point 62F are aligned along the second direction X when viewed from the first direction Z, the feed path 63 extends along the second direction X.

[0194] like Figure 13 As shown, the ground portion 5F is located on the second main surface 22 of the dielectric layer 20 of the substrate 2. The ground portion 5F is a ground portion shared by the first radiation electrode 3 and the second radiation electrode 4F. In other words, the ground portion 5F serves as a ground for the first radiation electrode 3 and the second radiation electrode 4F.

[0195] Figure 13 The ground portion 5F includes a ground electrode 51 , a connection line 52F, and a plurality of stubs 53 - 1 to 53 - 4 (hereinafter sometimes collectively referred to as 53 ).

[0196] The first ground electrode 51 faces the first radiation electrode 3 when viewed from the first direction Z. In the antenna substrate 1F, the first radiation electrode 3 and the first ground electrode 51 constitute a planar antenna (patch antenna). The first ground electrode 51 is a conductor pattern formed on the second main surface 22 of the dielectric layer 20. The first ground electrode 51 is planar. The first ground electrode 51 has a generally rectangular shape when viewed from the first direction Z. The first ground electrode 51 is larger than the first radiation electrode 3. When viewed from the first direction Z, the first radiation electrode 3 is embedded inside the first ground electrode 51.

[0197] The connecting line 52F is located between the first radiation electrode 3 and the second radiation electrode 4F when viewed from the first direction Z. The connecting line 52F is located between the first radiation electrode 3 and the second radiation electrode 4F when viewed from the first direction Z. The connecting line 52F is a conductor pattern formed on the second main surface 22 of the dielectric layer 20. The connecting line 52F is connected to the first ground electrode 51. The connecting line 52F and the first ground electrode 51 are formed continuously and integrally.

[0198] The connecting line 52F extends from the first ground electrode 51 toward the second radiation electrode 4F, but is not connected to the second radiation electrode 4F. In particular, when viewed from the first direction Z, a second feed point 62F and a feed path 63 exist between the first radiation electrode 3 and the second radiation electrode 4F. The connecting line 52F extends to a position closer to the second radiation electrode 4F than the second feed point 62F, but has a notch 52c around the second feed point 62F on the second main surface 22 to separate it from the second feed point 62F and the feed path 63.

[0199] The connecting line 52F extends from the first ground electrode 51 toward the second radiation electrode 4F, whereby the second radiation electrode 4F and the connecting line 52F constitute a monopole antenna.

[0200] In antenna substrate 1F, first ground electrode 51 and first radiating electrode 3 together form a planar antenna (patch antenna), while connecting line 52F and second radiating electrode 4F together form a monopole antenna. Antenna substrate 1F includes antennas of different types. Therefore, antenna substrate 1F can radiate radio waves in two different directions.

[0201] When viewed from the first direction Z, the center C3 of the first radiation electrode 3 and the center C5 of the connecting line 52F are aligned along the second direction X. In other words, a straight line L1 connecting the center C3 of the first radiation electrode 3 and the center C5 of the connecting line 52F is parallel to the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4F.

[0202] The connection line 52F has a shape that is line-symmetrical with respect to a line passing through the center C3 of the first radiation electrode 3 and parallel to the second direction X. This structure can further improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4F.

[0203] The connection line 52F is smaller in size than the first ground electrode 51 in the third direction Y. Figure 13 As shown, the dimension D1 of the connection line 52F in the third direction Y is smaller than the dimension D2 of the first ground electrode 51 in the third direction Y. This structure makes it easier for current to concentrate on the connection line 52 than on the first ground electrode 51 .

[0204] The size of the connection line 52F in the third direction Y is smaller than that of the first radiation electrode 3. Figure 3 As shown, the dimension D1 of the connection line 52 in the third direction Y is smaller than the dimension D3 of the first radiation electrode 3 in the third direction Y. This structure can achieve miniaturization of the substrate 2 in the third direction Y.

[0205] The stub 53 is connected to one of the first side 52a and the second side 52b of the connection line 52, which are opposite to each other in the third direction Y. The ground portion 5F includes a plurality of stubs 53, namely, four stubs 53-1 to 53-4. The stubs 53 are provided to improve the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4F. Figure 13 The structure of the short stub 53 is Figure 3 The structure of the short stub 53 is similar.

[0206] [1.7.2 Effects, etc.]

[0207] The antenna substrate 1F described above includes: a substrate 2; a planar first radiation electrode 3 disposed on the substrate 2; a second radiation electrode 4F disposed on the substrate 2, spatially separated from the first radiation electrode 3 in the second direction X when viewed in a first direction Z along the thickness of the substrate 2; and a ground portion 5F disposed on the substrate 2 and shared by the first radiation electrode 3 and the second radiation electrode 4F. The ground portion 5F includes: a ground electrode 51, which faces the first radiation electrode 3 when viewed in the first direction Z; a connecting line 52, which is located between the first radiation electrode 3 and the second radiation electrode 4F when viewed in the first direction Z and has a smaller dimension than the ground electrode 51 in a third direction Y, which is perpendicular to the second direction X, when viewed in the first direction Z; and a stub 53 connected to one of the first side 52a and the second side 52b of the connecting line 52, which face each other in the third direction Y. This structure improves the isolation characteristics between the first radiation electrode 3 and the second radiation electrode 4F.

[0208] In the antenna substrate 1F, the second radiation electrode 4F is located on the side opposite to the first radiation electrode 3 with respect to the connection line 52F so as not to face the ground portion 5F when viewed from the first direction Z. This structure enables miniaturization of the substrate 2.

[0209] [2. Modifications]

[0210] The embodiments of the present disclosure are not limited to the above-described embodiments. As long as the above-described embodiments can achieve the subject of the present disclosure, various modifications can be made according to the design, etc. The following lists modifications of the above-described embodiments. The modifications described below can be applied in appropriate combinations.

[0211] In the following, even if the above-mentioned embodiments 1 to 7 are applicable, the reference numerals used in the first embodiment are mentioned. This is only for simplification of the description and does not exclude the application to the second to seventh embodiments.

[0212] In one variation, the frequency band for wireless communications using the first radiating electrode 3 or the second radiating electrode 4 is not particularly limited. For example, the frequency band can be selected from well-known frequency bands, such as the frequency band for UWB-based wireless communications, the frequency band for Bluetooth (registered trademark), the frequency band for Wi-Fi-based wireless communications, the mid-frequency band of the 2G (2nd Generation Mobile Communications) standard, the low-frequency band of the 4G (4th Generation Mobile Communications) standard, and the low-frequency band of the 5G (5th Generation Mobile Communications) standard. An example of the 2G standard is the GSM (registered trademark) standard (GSM: Global System for Mobile Communications). An example of the 4G standard is the 3GPP (registered trademark) LTE standard (LTE: Long Term Evolution). An example of the 5G standard is 5G NR (New Radio). The frequency band can be selected from various communication standards used for wireless LAN, specific low-power wireless, and short-range wireless communications.

[0213] In a modified example, the shapes and dimensions of the first radiation electrode 3, the second radiation electrode 4, and the ground portion 5, in particular, the shapes and dimensions of the first ground electrode 51, the connecting line 52, the stub 53, and the second ground electrode 54 of the ground portion 5, can be appropriately modified. For example, the first radiation electrode 3, the second radiation electrode 4, the first ground electrode 51, the connecting line 52, and the second ground electrode 54 do not necessarily need to be line-symmetrical. The arrangement of the stub 53 relative to the connecting line 52 can also be appropriately modified.

[0214] In one variation, the number of stubs 53 is not particularly limited. The ground portion 5 only needs to include one or more stubs 53. Alternatively, the ground portion 5 may include multiple types of stubs 53 having different structures. For example, the ground portion 5 may include two or more of the stubs 53, 53A, 53B, 53C, 53D, and 53E described in the above embodiments. For example, the ground portion 5 of Embodiment 1 may include the stub 53E of Embodiment 6 in addition to the stub 53.

[0215] In one variation, the structure of the substrate 2 is not necessarily limited. For example, the shape of the substrate 2 is not limited to a rectangular plate. The substrate 2 may be a well-known structure such as a double-sided copper-clad laminate or a multilayer substrate. As an example, in Embodiment 1, the substrate 2 may include multiple dielectric layers, and the first radiation electrode 3, the second radiation electrode 4, and the ground portion 5 may be located on different dielectric layers. Alternatively, the substrate 2 may include, in addition to the dielectric layers, a protective layer for protecting the first radiation electrode 3, the second radiation electrode 4, or the ground portion 5.

[0216] In one variation, stub 53 may include one or more conductive paths 531a, 531b formed on substrate 2 and one or more chip components 532 mounted on substrate 2. The number of conductive paths 531a, 531b in stub 53 is not particularly limited. The number of chip components 532 in stub 53 is not particularly limited. Chip components 532 may include at least one of an inductor, a capacitor, and a 0Ω resistor. Alternatively, as in Embodiment 2, stub 53A may not include chip components 532.

[0217] In a modified example, the stub 53 does not necessarily extend in a direction parallel to any of the first direction Z, the second direction X, and the third direction Y. The stub 53 may extend in a direction intersecting any of the first direction Z, the second direction X, and the third direction Y.

[0218] In a modified example, the stub 53D may be bent twice or more and is not limited to a meandering shape. The stub 53D may be, for example, U-shaped or spiral.

[0219] In one variation, the structure of the first feed point 61 or the second feed points 62 and 62F is not particularly limited. For example, the first feed point 61 is directly connected to the first radiation electrode 3. However, it may also be configured to provide indirect power supply through capacitive coupling with the first radiation electrode 3. This also applies to the second feed points 62 and 62F.

[0220] In a modified example, the antenna module 10 is not limited to the structure including the electronic components 11 and 12, and may include more than one electronic component. The electronic component is not limited to the processing circuit or the connector.

[0221] [3. Form]

[0222] As can be seen from the above embodiments and variations, the present disclosure includes the following aspects. Below, reference numerals are enclosed in parentheses only to clarify the correspondence between the embodiments. Furthermore, for the sake of readability, reference numerals enclosed in parentheses may be omitted for the second and subsequent times.

[0223] A first embodiment is an antenna substrate (1, 1A to 1F) comprising: a substrate (2); a planar first radiation electrode (3) disposed on the substrate (2); a second radiation electrode (4; 4F) disposed on the substrate (2) so as to be spatially separated from the first radiation electrode (3) in a second direction (X) when viewed from a first direction (Z) along the thickness direction of the substrate (2); and a ground portion (5; 5A to 5F) disposed on the substrate (2) and shared by the first radiation electrode (3) and the second radiation electrode (4; 4F), the ground portion (5; 5A to 5F) comprising: a ground electrode (51) disposed on the substrate (2) and spaced apart from the first radiation electrode (3) in a second direction (X) when viewed from a first direction (Z) along the thickness direction of the substrate (2). The invention relates to a first radiation electrode (3) and a second radiation electrode (4; 4F) that is opposite to the first radiation electrode (3) when viewed in the first direction (Z); a connecting line (52, 52F) that is located between the first radiation electrode (3) and the second radiation electrode (4; 4F) when viewed in the first direction (Z) and has a smaller size than the ground electrode (51) in a third direction (Y) perpendicular to the second direction (X) when viewed in the first direction (Z); and a stub (53; 53A; 53B; 53C; 53D; 53E) that is connected to one of a first side (52a) and a second side (52b) of the connecting line (52; 52F) that are opposite to each other in the third direction (Y). This configuration can improve the isolation characteristics between the first radiation electrode (3) and the second radiation electrode (4; 4F).

[0224] The second embodiment is an antenna substrate (1; 1A to 1F) based on the first embodiment. In this embodiment, the connection line (52; 52F) is smaller in size than the first radiation electrode (3) in the third direction (Y). This embodiment can achieve miniaturization of the substrate (2) in the third direction (Y).

[0225] A third embodiment is an antenna substrate (1; 1A to 1F) based on the first or second embodiment. In this embodiment, the ground portion (5; 5A to 5F) includes a plurality of stubs (53; 53A; 53B; 53C; 53D; 53E). The plurality of short stubs (53; 53A; 53B; 53C; 53D; 53E) include one or more first short stubs (53-1, 53-2; 53A-1, 53A-2; 53B-1, 53B-2; 53C-1 to 53C-3; 53D-1, 53D-2; 53E-1, 53E-2) connected to the first side (52a) of the connecting line (52; 52F) and one or more second short stubs (53-3, 53-4; 53A-3, 53A-4; 53B-3, 53B-4; 53C-4 to 53C-6; 53D-3, 53D-4; 53E-3, 53E-4) connected to the second side (53b) of the connecting line (52; 52F). This configuration can improve the electrical symmetry of the antenna substrate (1; 1A to 1F), and contributes to improving the isolation characteristics between the first radiation electrode (3) and the second radiation electrode (4; 4F) and the antenna characteristics.

[0226] A fourth embodiment is an antenna substrate (1; 1A to 1F) based on the third embodiment. In this embodiment, the number of the one or more first short stubs (53-1, 53-2; 53A-1, 53A-2; 53B-1, 53B-2; 53C-1 to 53C-3; 53D-1, 53D-2; 53E-1, 53E-2) is equal to the number of the one or more second short stubs (53-3, 53-4; 53A-3, 53A-4; 53B-3, 53B-4; 53C-4 to 53C-6; 53D-3, 53D-4; 53E-3, 53E-4). This embodiment can improve the electrical symmetry of the antenna substrate (1; 1A to 1F), contributing to improvements in isolation characteristics between the first radiation electrode (3) and the second radiation electrode (4; 4F) and antenna characteristics.

[0227] A fifth embodiment is an antenna substrate (1; 1A to 1F) based on the third or fourth embodiment. In this embodiment, a first connection position of the one or more first short stubs (53-1, 53-2; 53A-1, 53A-2; 53B-1, 53B-2; 53C-1 to 53C-3; 53D-1, 53D-2; 53E-1, 53E-2) connected to the connection line (52; 52F) and a second connection position of the one or more second short stubs (53-3, 53-4; 53A-3, 53A-4; 53B-3, 53B-4; 53C-4 to 53C-6; 53D-3, 53D-4; 53E-3, 53E-4) connected to the connection line (52; 52F) are different in the second direction (X). This configuration can further improve the isolation characteristics between the first radiation electrode (3) and the second radiation electrode (4; 4F).

[0228] The sixth embodiment is an antenna substrate (1; 1A to 1E) based on the fifth embodiment. In this embodiment, the first connection position and the second connection position are in a point-symmetrical relationship with respect to the center (C5) of the connection line (52) viewed from the first direction (Z). This embodiment can further improve the isolation characteristics between the first radiation electrode (3) and the second radiation electrode (4).

[0229] The seventh embodiment is an antenna substrate (1; 1B to 1F) based on any one of the first to sixth embodiments. In this embodiment, the short stub (53; 53B; 53C; 53D; 53E) includes: one or more conductive paths (531a, 531b; 531c; 531d; 531e, 531f, 531g) formed on the substrate (2); and one or more chip components (532) mounted on the substrate (2), the one or more chip components (532) including at least one of an inductor, a capacitor, and a 0Ω resistor. This embodiment can facilitate the setting of the resonant frequency of the short stub (53; 53B; 53C; 53D; 53E).

[0230] An eighth embodiment is an antenna substrate (1; 1B to 1F) based on the seventh embodiment. In this embodiment, at least one of the one or more chip components (532) is located between the one or more conductive paths (531a, 531b; 531c; 531d; 531e, 531f, 531g) and the connecting line (52, 52F). This embodiment can further facilitate the setting of the resonant frequency of the short stub (53; 53B; 53C; 53D; 53E).

[0231] A ninth aspect is an antenna substrate (1; 1A; 1C-1F) based on any one of the first to eighth aspects. In this aspect, at least a portion (531b; 531g) of the short stub (53; 53A; 53C; 53D; 53E) is oriented along the second direction (X). This aspect can shorten the electrical length of the short stub required to set the resonant frequency of the short stub (53; 53B; 53C; 53D; 53E) to a desired resonant frequency.

[0232] A tenth embodiment is an antenna substrate (1; 1A to 1F) based on any one of the first to ninth embodiments. In this embodiment, when viewed from the first direction (Z), the center (C3) of the first radiation electrode (3) and the center (C5) of the connecting line (52; 52F) are aligned along the second direction (X). This embodiment can further improve the isolation characteristics between the first radiation electrode (3) and the second radiation electrode (4; 4F).

[0233] The eleventh embodiment is an antenna substrate (1; 1A to 1E) based on the tenth embodiment. In this embodiment, when viewed from the first direction (Z), the connecting line (52; 52F) is line-symmetrical with respect to a line passing through the center (C3) of the first radiation electrode (3) and parallel to the second direction (X). This embodiment can further improve the isolation characteristics between the first radiation electrode (3) and the second radiation electrode (4; 4F).

[0234] A twelfth embodiment is an antenna substrate (1; 1A to 1F) based on any one of the first to eleventh embodiments. In this embodiment, when viewed from the first direction (Z), the center (C3) of the first radiation electrode (3) and the feed point (61) of the first radiation electrode (3) are arranged along the second direction (X). This embodiment can achieve miniaturization of the substrate (2) in the third direction (Y).

[0235] A thirteenth embodiment is an antenna substrate (1; 1A to 1F) based on any one of the first to twelfth embodiments. In this embodiment, when viewed from the first direction (Z), the center (C4) of the second radiation electrode (4; 4F) and the feed point (62; 62F) of the second radiation electrode (4; 4F) are aligned along the second direction (X). This embodiment enables miniaturization of the substrate (2) in the third direction (Y).

[0236] A fourteenth aspect is an antenna substrate (1; 1A to 1F) based on any one of the first to thirteenth aspects. In this aspect, the ground portion (5; 5A to 5F) includes a plurality of stubs (53; 53A; 53B; 53C; 53D; 53E), and two or more of the stubs (53; 53A; 53B; 53D; 53E) are connected to the first side (52a) of the connecting line (52; 52F) and arranged along the second direction (X). This aspect can further improve the isolation characteristics between the first radiation electrode (3) and the second radiation electrode (4; 4F).

[0237] A fifteenth embodiment is an antenna substrate (1; 1A to 1F) based on the fourteenth embodiment. In this embodiment, the interval between the two or more short stubs (53; 53A; 53B; 53C; 53D; 53E) in the second direction (X) is greater than the width of the two or more short stubs (53; 53A; 53B; 53C; 53D; 53E). This embodiment can further improve the isolation characteristics between the first radiation electrode (3) and the second radiation electrode (4; 4F).

[0238] The sixteenth embodiment is an antenna substrate (1C) based on the fourteenth or fifteenth embodiment. In this embodiment, two or more of the two or more stubs (53C) have different electrical lengths. This embodiment can improve the isolation characteristics between the first radiation electrode (3) and the second radiation electrode (4; 4F) over a wider frequency band.

[0239] The seventeenth embodiment is an antenna substrate (1E) based on any one of the first to sixteenth embodiments. In this embodiment, at least a portion (531f) of the short stub (53E) is along a direction intersecting a plane including the second direction (X) and the third direction (Y). This embodiment can achieve miniaturization of the substrate (2) in the third direction (Y).

[0240] The 18th embodiment is an antenna substrate (1D) based on any one of the 1st to 17th embodiments. In this embodiment, the stub (53D) is bent twice or more. This embodiment can shorten the maximum length of one side of the area required for the arrangement of the stub (53D).

[0241] The 19th aspect is an antenna substrate (1; 1A to 1E) based on any one of the 1st to 18th aspects. In this aspect, the second radiation electrode (4) is planar, the ground electrode (51) is a first ground electrode (51), the ground portion (5; 5A to 5E) includes a second ground electrode (54) facing the second radiation electrode (4) when viewed from the first direction (Z), and the connecting line (52) connects the first ground electrode (51) and the second ground electrode (54). This aspect can improve the electrical symmetry of the antenna substrate (1; 1A to 1E), contributing to improvements in isolation characteristics between the first radiation electrode (3) and the second radiation electrode (4) and antenna characteristics.

[0242] A 20th embodiment is an antenna substrate (1F) based on any one of the 1st to 18th embodiments. In this embodiment, the second radiation electrode (4F) is located on the side opposite to the first radiation electrode (3) with respect to the connection line (52F) so as not to face the ground portion (5F) when viewed from the first direction (Z). This embodiment enables miniaturization of the substrate (2).

[0243] The 21st embodiment is an antenna substrate (1; 1A to 1F) based on any one of the 1st to 20th embodiments. In this embodiment, the second direction (X) is the longitudinal direction of the substrate (2), and the third direction (Y) is the width direction of the substrate (2). This embodiment can achieve miniaturization of the substrate (2).

[0244] The 22nd embodiment is an antenna substrate (1E) based on any one of the 1st to 21st embodiments. In this embodiment, the stub (53E) is placed between the sides (52a, 52b) of the connection line (52) connected to the stub (53E) and the sides (3a, 3b) of the first radiation electrode (3) located on the same side as the sides (52a, 52b). This embodiment can achieve miniaturization of the substrate (2) in the third direction (Y).

[0245] A 23rd embodiment includes: an antenna substrate (1; 1A to 1F) based on any one of the 1st to 22nd embodiments; and electronic components (11, 12) mounted on the antenna substrate (1; 1A to 1F). This embodiment can improve the isolation characteristics between the first radiation electrode (3) and the second radiation electrode (4; 4F).

[0246] The second to twenty-second aspects are optional elements and are not essential.

[0247] Industrial applicability

[0248] The present disclosure can be applied to an antenna substrate and an antenna module including the antenna substrate. Specifically, the present disclosure can be applied to an antenna substrate including a plurality of radiation electrodes and an antenna module including the antenna substrate.

[0249] Description of Reference Numerals

[0250] 10. Antenna module; 11, 12. Electronic components; 1. 1A, 1B, 1C, 1D, 1E, 1F. Antenna substrate; 2. Substrate; 3. First radiation electrode; 3a. First side (side of the first radiation electrode); 3b. Second side (side of the first radiation electrode); 4. 4F. Second radiation electrode; 5. 5A, 5B, 5C, 5D, 5E, 5F; 51. Ground electrode (first ground electrode); 52. 52F. Connecting line; 52a. First side (side of the ground electrode); , side); 52b, second side (side of ground electrode); 53-1, 53-2, short stub (first short stub); 53-3, 53-4, short stub (second short stub); 53A-1, 53A-2, short stub (first short stub); 53A-3, 53A-4, short stub (second short stub); 53B-1, 53B-2, short stub (first short stub); 53B-3, 53B-4, short stub (second short stub); 53C-1, 53C-2, 53C-3, short stub (first short stub); 53C-4, 53C-5, 53C-6, short stub (second short stub); 53D-1, 53D-2, short stub (first short stub); 53D-3, 53D-4, short stub (second short stub); 53E-1, 53E-2, short stub (first short stub); 53E-3, 53E-4, short stub (second short stub); 53F-1, 53F-2, short stub (first short stub); 53F- 3. 53F-4, stub (second stub); 531a, 531b, 531c, 531d, 531e, 531f, 531g, conductive path; 532, chip component; 54, second ground electrode; 61, feed point; 62, 62F, feed points; C3, center (center of first radiation electrode); C4, center (center of second radiation electrode); C5, center (center of connection line); Z, first direction; X, second direction; Y, third direction.

Claims

1. An antenna substrate, wherein: The antenna substrate includes: substrate; a planar first radiation electrode disposed on the substrate; a second radiation electrode arranged on the substrate so as to be spatially separated from the first radiation electrode in a second direction when viewed from a first direction along the thickness direction of the substrate; and a ground portion disposed on the substrate and shared by the first radiation electrode and the second radiation electrode; The grounding portion includes: a ground electrode facing the first radiation electrode when viewed from the first direction; a connecting line located between the first radiation electrode and the second radiation electrode when viewed from the first direction, and having a dimension smaller than that of the ground electrode in a third direction orthogonal to the second direction when viewed from the first direction; and A stub is connected to one of the first side and the second side of the connection line that are opposite to each other in the third direction.

2. The antenna substrate according to claim 1, wherein The connecting line has a dimension in the third direction smaller than that of the first radiation electrode.

3. The antenna substrate according to claim 1 or 2, wherein: The grounding portion includes a plurality of stubs. The plurality of stubs include: one or more first stubs connected to the first side of the connecting line; and One or more second stubs are connected to the second side of the connecting line.

4. The antenna substrate according to claim 3, wherein: The number of the one or more first short stubs is equal to the number of the one or more second short stubs.

5. The antenna substrate according to claim 3 or 4, wherein: A first connection position of the one or more first short stubs to the connection line and a second connection position of the one or more second short stubs to the connection line are different in the second direction. The antenna substrate according to claim 5 , wherein: The first connection position and the second connection position are in a point-symmetrical relationship with respect to a center of the connection line when viewed from the first direction.

7. The antenna substrate according to any one of claims 1 to 6, wherein The stub comprises: one or more conductive paths formed on the substrate; and One or more chip components mounted on the substrate, The one or more chip components include at least one of an inductor, a capacitor, and a 0Ω resistor.

8. The antenna substrate according to claim 7, wherein: At least one of the one or more chip components is located between the one or more conductive paths and the connecting line.

9. The antenna substrate according to any one of claims 1 to 8, wherein At least a portion of the stub is along the second direction.

10. The antenna substrate according to any one of claims 1 to 9, wherein When viewed from the first direction, the center of the first radiation electrode and the center of the connecting line are aligned along the second direction.

11. The antenna substrate according to any one of claims 1 to 10, wherein When viewed from the first direction, the center of the first radiation electrode and a feeding point of the first radiation electrode are aligned along the second direction.

12. The antenna substrate according to any one of claims 1 to 11, wherein When viewed from the first direction, the center of the second radiation electrode and the feeding point of the second radiation electrode are aligned along the second direction.

13. The antenna substrate according to any one of claims 1 to 12, wherein The grounding portion includes a plurality of stubs. Two or more short stubs among the plurality of short stubs are connected to the first side of the connecting line and are arranged along the second direction.

14. The antenna substrate according to claim 13, wherein The interval between the two or more short stubs in the second direction is larger than the width of the two or more short stubs.

15. The antenna substrate according to claim 13 or 14, wherein: Two or more of the two or more stubs have different electrical lengths from each other.

16. The antenna substrate according to any one of claims 1 to 15, wherein At least a portion of the stub extends along a direction intersecting a plane including the second direction and the third direction.

17. The antenna substrate according to any one of claims 1 to 16, wherein The second radiation electrode is planar. The ground electrode is a first ground electrode, The ground portion includes a second ground electrode facing the second radiation electrode when viewed from the first direction. The connection line connects the first ground electrode and the second ground electrode.

18. The antenna substrate according to any one of claims 1 to 17, wherein The second radiation electrode is located on the opposite side of the first radiation electrode with respect to the connection line so as not to face the ground portion when viewed from the first direction.

19. The antenna substrate according to any one of claims 1 to 18, wherein The stub is placed in the third direction between a side of the connection line connected to the stub and a side of the first radiation electrode located on the same side as the side.

20. An antenna module, wherein: The antenna module includes: The antenna substrate according to any one of claims 1 to 19; and An electronic component is mounted on the antenna substrate.

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