Antenna board and antenna module

Abstract

The present invention provides an antenna substrate and antenna module that can be miniaturized while improving the isolation characteristics between the first and second radiating electrodes. [Solution] The antenna substrate 1 comprises a substrate 2, a planar first radiating electrode 3 disposed on the substrate 2, a second radiating electrode 4 disposed on the substrate 2 spatially separated from the first radiating electrode 3 in a second direction X when viewed from a first direction Z along the thickness direction of the substrate 2, and a grounding portion 5 disposed on the substrate 2 common to the first radiating electrode 3 and the second radiating electrode 4. The grounding portion 5 includes a grounding electrode 51 facing the first radiating electrode 3 when viewed from the first direction Z, a connecting line 52 located between the first radiating electrode 3 and the second radiating electrode 4 when viewed from the first direction Z, and smaller in size than the grounding electrode 51 in a third direction Y perpendicular to the second direction X when viewed from the first direction Z, and a stub 53 connected to one of the first side 52a and second side 52b of the connecting line 52 that face 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 plane in order to optimize the performance of an antenna system. FIG. 2 of Patent Document 1 shows an example of an antenna system. The system (system 200) in FIG. 2 includes a ground plane (ground plane 201), antenna elements (antenna elements 202, 203), a filter (filter 204), and signals (signals 205, 206). The filter is realized by forming eight slots (slots 204a) in the ground plane. The eight slots are perpendicular to the straight path between the antenna elements but have a length that does not cross the entire ground plane. As a result, a conductive path (conductive path 204b) connecting the antenna elements is formed in the ground plane. The slots are narrow enough that both sides in the width direction of the slots are capacitively coupled, thereby 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 a capacitive reactance component and an inductive reactance component.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Patent Document 1 describes a filter that reduces the signal and contributes to improving the isolation characteristics between antenna elements. In Patent Document 1, in order for the slot to function effectively, it is necessary to ensure that the length of the slot is sufficient according to the frequency bandwidth of the signal to be reduced. Furthermore, the ground plane itself needs to be made larger to form a slot of sufficient length, which leads to an increase in the overall size of the antenna system.

[0005] This disclosure provides an antenna substrate and an antenna module that can be miniaturized while improving the isolation characteristics between a first radiating electrode and a second radiating electrode. [Means for solving the problem]

[0006] An antenna substrate according to one aspect of the present disclosure comprises a substrate, a planar first radiating electrode disposed on the substrate, a second radiating electrode disposed on the substrate at a spatial distance from the first radiating 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 common to the first radiating electrode and the second radiating electrode, wherein the ground portion includes a ground electrode facing the first radiating electrode when viewed from the first direction, a connecting line located between the first radiating electrode and the second radiating electrode when viewed from the first direction and smaller in size than 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 the first and second sides of the connecting line that face each other in the third direction.

[0007] An antenna module according to one aspect of this disclosure comprises the above-mentioned antenna substrate and electronic components mounted on the antenna substrate. [Effects of the Invention]

[0008] Aspects of this disclosure enable miniaturization while improving the isolation characteristics between the first radiating electrode and the second radiating electrode. [Brief explanation of the drawing]

[0009] [Figure 1] Perspective view of an example configuration of an antenna module according to Embodiment 1 [Figure 2] Plan view of the antenna substrate of the antenna module in Figure 1. [Figure 3] Bottom view of the antenna substrate of the antenna module in Figure 1. [Figure 4] Bottom view of an example of the antenna substrate configuration according to Embodiment 2 [Figure 5] Bottom view of an example of the antenna substrate configuration according to Embodiment 3 [Figure 6] Bottom view of an example of the antenna substrate configuration according to Embodiment 4 [Figure 7] Bottom view of an example of the antenna substrate configuration according to Embodiment 5 [Figure 8] Perspective view of an example of the antenna substrate configuration according to Embodiment 6 [Figure 9] Plan view of the antenna substrate in Figure 8. [Figure 10] Figure 8 shows the bottom view of the antenna substrate. [Figure 11] Perspective view of an example of the antenna substrate configuration according to Embodiment 7 [Figure 12] Plan view of the antenna substrate in Figure 11. [Figure 13] Figure 11 is a bottom view of the antenna substrate. [Modes for carrying out the invention]

[0010] [1. Embodiments] The embodiments of this disclosure will be described below, with reference to the drawings as appropriate. However, the embodiments described below are illustrative examples for illustrating this disclosure and are not intended to limit this disclosure to the following (for example, the shape, dimensions, arrangement, etc., of each component). Unless otherwise specified, positional relationships such as up, down, left, and right shall be based on the positional relationships shown in the drawings. The figures described in the embodiments below are schematic diagrams, and the ratios of the size and thickness of each component in each figure do not necessarily reflect the actual dimensional ratios. Furthermore, the dimensional ratios of each element are not limited to the ratios shown in the drawings.

[0011] In the following description, when it is necessary to distinguish between a plurality of components from each other, prefixes such as "first", "second", etc. are attached to the names of the components. However, when the components can be distinguished from each other by the reference numerals attached to the components, the prefixes such as "first", "second", etc. may be omitted in consideration of the readability of the text.

[0012] [1.1 Embodiment 1] [1.1.1 Configuration] FIG. 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 example, for wireless communication in a predetermined frequency band. The antenna module 10 includes an antenna substrate 1 and electronic components 11 and 12 mounted on the antenna substrate 1. In FIG. 1, the electronic components 11 and 12 are schematically shown.

[0013] FIG. 2 is a plan view of the antenna substrate 1. FIG. 3 is a bottom view of the antenna substrate 1.

[0014] As shown in FIGS. 1, 2, and 3, the antenna substrate 1 includes a substrate 2, a first radiating electrode 3, a second radiating electrode 4, a ground portion 5, a first feeding point 61, and a second feeding point 62.

[0015] The substrate 2 has a thickness. In the present embodiment, the direction along the thickness direction of the substrate 2 is defined as the first direction Z. Two directions orthogonal to each other of the substrate 2 viewed from the first direction Z are defined as the second direction X and the third direction Y. In the present embodiment, the second direction X and the third direction Y are each orthogonal to the first direction Z. In the present embodiment, the substrate 2 is in the shape of a rectangular plate. For example, the second direction X is the length direction of the substrate 2, and the third direction Y is the width direction of the substrate 2.

[0016] As shown in Figure 1, the substrate 2 includes a dielectric layer 20. The dielectric layer 20 has a first main surface 21 and a second main surface 22 opposite to the first main surface 21. The first main surface 21 and the second main surface 22 are, for example, both sides in the thickness direction of the dielectric layer 20. The substrate 2 is provided with a protective layer 23. The protective layer 23 is electrically insulating and covers the second main surface 22 of the dielectric layer 20. Note that for clarity of the figure, the protective layer 23 may be omitted from the illustration.

[0017] 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 made of epoxy, polyimide, etc., multilayer resin substrates formed by laminating multiple resin layers made of liquid crystal polymer (LCP) having a lower dielectric constant, multilayer resin substrates formed by laminating multiple resin layers made of fluororesin, and ceramic multilayer substrates other than LTCC.

[0018] As shown in Figure 2, the first radiating electrode 3 and the second radiating electrode 4 are located on the first main surface 21 of the dielectric layer 20 of the substrate 2. The first radiating electrode 3 and the second radiating electrode 4 are spaced apart on the first main surface 21 of the dielectric layer 20 in the second direction X. The second radiating electrode 4 is positioned on the substrate 2 spatially away from the first radiating electrode 3 in the second direction X when viewed from the first direction Z. In Figure 2, the first radiating electrode 3 and the second radiating 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 length direction of the substrate 2, and the third direction Y is the width direction of the substrate 2. This configuration enables miniaturization of the substrate 2.

[0019] The first radiating electrode 3 is a conductive pattern formed on the first main surface 21 of the dielectric layer 20. The first radiating electrode 3 is planar. In Figure 2, the first radiating electrode 3 is approximately rectangular when viewed from the first direction Z. As shown in Figure 2, the first radiating electrode 3 is symmetric with respect to a line passing through the center C3 of the first radiating electrode 3 and parallel to the second direction X, when viewed from the first direction Z.

[0020] The second radiating electrode 4 is a conductive pattern formed on the first main surface 21 of the dielectric layer 20. The second radiating electrode 4 is planar. In Figure 2, the second radiating electrode 4 is substantially rectangular when viewed from the first direction Z. As shown in Figure 2, the second radiating electrode 4 is symmetric with respect to a line passing through the center C4 of the second radiating electrode 4 and parallel to the second direction X when viewed from the first direction Z. In this embodiment, as shown in Figure 2, when viewed from the first direction Z, the center C3 of the first radiating electrode 3 and the center C4 of the second radiating electrode 4 are aligned along the second direction X. That is, the straight line connecting the center C3 of the first radiating electrode 3 and the center C4 of the second radiating electrode 4 is parallel to the second direction X.

[0021] The shapes of the first radiating electrode 3 and the second radiating electrode 4 are determined according to the frequency band used for wireless communication. In this embodiment, the first radiating electrode 3 and the second radiating electrode 4 have the same shape. Examples of wireless communication frequency bands include the frequency band used for Wi-Fi wireless communication. Examples of Wi-Fi wireless communication frequency bands include the frequency band around 2.4 GHz (e.g., 2.4 GHz to 2.5 GHz) and the frequency band around 5 GHz (e.g., 5.15 GHz to 5.8 GHz).

[0022] Increasing the size of the first radiating electrode 3 and the second radiating electrode 4 in the third direction Y widens the frequency bandwidth of wireless communication. On the other hand, the first radiating electrode 3 and the second radiating electrode 4 are located at both ends of the dielectric layer 20 of the substrate 2 in the second direction X. Therefore, decreasing the size of the first radiating electrode 3 and the second radiating electrode 4 in the third direction Y allows for miniaturization of the substrate 2 in the third direction Y.

[0023] As shown in Figure 3, the grounding point 5 is located on the second main surface 22 of the dielectric layer 20 of the substrate 2. The grounding point 5 is a common grounding point for the first radiating electrode 3 and the second radiating electrode 4. The grounding point 5 is used as a ground for the first radiating electrode 3 and the second radiating electrode 4.

[0024] The grounding section 5 includes a grounding electrode 51, a connecting line 52, and a plurality of stubs 53-1 to 53-4 (hereinafter collectively referred to as reference numeral 53). Furthermore, the grounding section 5 includes a grounding electrode 54 separate from the grounding electrode 51. To clearly distinguish between the grounding electrodes 51 and 54, the grounding electrode 51 may be referred to as the first grounding electrode 51, and the grounding electrode 54 as the second grounding electrode 54.

[0025] As shown in Figure 3, the first ground electrode 51 and the second ground electrode 54 are spaced apart on the second main surface 22 of the dielectric layer 20 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.

[0026] The first ground electrode 51 faces the first radiating electrode 3 when viewed from the first direction Z. The first radiating electrode 3 and the first ground electrode 51 constitute a planar antenna (patch antenna). The first ground electrode 51 is a conductive 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 is approximately rectangular when viewed from the first direction Z. The size of the first ground electrode 51 is larger than the size of the first radiating electrode 3. When viewed from the first direction Z, the first radiating electrode 3 is located inside the first ground electrode 51.

[0027] The second ground electrode 54 faces the second radiating electrode 4 when viewed from the first direction Z. The second radiating electrode 4 and the second ground electrode 54 constitute a planar antenna (patch antenna). The second ground electrode 54 is a conductive 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 is approximately rectangular when viewed from the first direction Z. The size of the second ground electrode 54 is larger than the size of the second radiating electrode 4. When viewed from the first direction Z, the second radiating electrode 4 is located inside the second ground electrode 54.

[0028] In the antenna substrate 1, the first ground electrode 51, together with the first radiating electrode 3, constitutes a planar antenna (patch antenna), and the second ground electrode 54, together with the second radiating electrode 4, also constitutes a planar antenna (patch antenna). This configuration enables improved electrical symmetry in the antenna substrate 1 and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4. Furthermore, since the antenna substrate 1 is equipped with antennas of the same type (patch antennas), the antenna gain in the first direction Z can be increased.

[0029] In this embodiment, the first grounding electrode 51 and the second grounding electrode 54 have the same shape.

[0030] The connecting line 52 is located between the first radiating electrode 3 and the second radiating electrode 4 when viewed from the first direction Z. In this embodiment, the connecting line 52 is located between the first grounding electrode 51 and the second grounding electrode 54 when viewed from the first direction Z. More specifically, the connecting line 52 connects the first grounding electrode 51 and the second grounding electrode 54. In other words, the connecting line 52 has a shape that extends along the second direction X from the first grounding electrode 51 to the second grounding electrode 54. The connecting line 52 is a conductor pattern formed on the second main surface 22 of the dielectric layer 20. In this embodiment, the first grounding electrode 51, the second grounding electrode 54 and the connecting line 52 are formed as a continuous, integrated unit.

[0031] Viewed from the first direction Z, the center C3 of the first radiating 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 radiating electrode 3 and the center C5 of the connecting line 52 is parallel to the second direction X. This configuration makes it easier for the current distribution flowing through the connecting line 52 to be symmetric with respect to the straight line L1. This enables further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0032] The connecting line 52 has a shape that is symmetrical with respect to a line passing through the center C3 of the first radiating electrode 3 and parallel to the second direction X. This configuration makes it easier for the current distribution flowing through the connecting line 52 to be symmetrical with respect to a line passing through the center C5 of the connecting line 52 and parallel to the second direction X. This enables further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0033] The connecting line 52 is planar. The connecting line 52 is substantially rectangular when viewed from the first direction Z. The connecting line 52 has a first side 52a and a second side 52b that face 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 connecting line 52 is smaller in size than the first ground electrode 51 in the third direction Y. As shown in Figure 3, 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 that face each other in the third direction Y. In this configuration, current is more likely to concentrate in the connecting line 52 than in the first ground electrode 51. In this embodiment, the first ground electrode 51 is substantially rectangular in shape, and its first side 51a and 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 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 51b of the first ground electrode 51 is on the same side as the second side 52b of the connecting line 52 (the side of the third direction Y).

[0034] The connecting line 52 is smaller in size than the first radiating electrode 3 in the third direction Y. As shown in Figure 3, the dimension D1 of the connecting line 52 in the third direction Y is smaller than the dimension D3 of the first radiating 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 radiating electrode 3 that are opposite each other in the third direction Y. This configuration enables miniaturization of the substrate 2 in the third direction Y. In this embodiment, the first radiating electrode 3 is substantially rectangular, and the first side 3a and the second side 3b are parallel to the second direction X. Therefore, the first side 3a of the first radiating electrode 3 is parallel to the first side 52a of the connecting line 52, and the second side 3b of the first radiating electrode 3 is parallel to the second side 52b of the connecting line 52. The first side 3a of the first radiating electrode 3 is on the same side (opposite side in the third direction Y) as the first side 52a of the connecting line 52. The second side 3b of the first radiating electrode 3 is on the same side (third direction Y side) as the second side 52b of the connecting line 52.

[0035] 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 radiating electrode 3 and the second radiating electrode 4. The stub 53 is a distributed-parameter circuit. The stub 53 is an open stub with its tip open. The resonant frequency of the open stub is the frequency at which the electrical length of the open stub becomes 1 / 4 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 radiating electrode 3 and the second radiating 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 radiating electrode 3 and the second radiating electrode 4.

[0036] As described above, the dimension D1 of the connecting line 52 is smaller than the dimension D2 of the first ground electrode 51, so current tends to concentrate more in the connecting line 52 than in the first ground electrode 51. Since the stub 53 is connected to the connecting line 52 and not to the first ground electrode 51, current flows more easily through the stub 53. Therefore, the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4 can be efficiently improved. Furthermore, since the stub 53 is connected to the connecting line 52 and not to the first ground electrode 51, the length of the stub 53 can be set independently of the ground electrode 51. Therefore, unlike the configuration that forms a slot in the ground plane as in Patent Document 1, it is not necessary to enlarge the ground electrode 51 in order to form a stub 53 of sufficient length. Consequently, the antenna substrate 1 can be miniaturized.

[0037] In this way, the antenna substrate 1 can be miniaturized while also enabling improved isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0038] In this embodiment, the grounding portion 5 includes a plurality of stubs 53, i.e., four stubs 53-1 to 53-4.

[0039] First, the configuration of the stub 53 will be described. As shown in Figure 3, stubs 53-1, 53-2, 53-3, and 53-4 have the same configuration. The stub 53 has a bent shape. In particular, the stub 53 is L-shaped when viewed from the first direction Z. The stub 53 includes conductive paths 531a and 531b and a chip component 532.

[0040] Conductive paths 531a and 531b are formed on the substrate 2. Conductive paths 531a and 531b are conductor patterns formed on the second main surface 22 of the dielectric layer 20. More specifically, conductive path 531a extends from the connecting line 52 along the third direction Y. Conductive path 531b extends from the tip of conductive path 531a along the second direction X. Conductive paths 531a and 531b are linear.

[0041] In stubs 53-1 and 53-2, 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 stubs 53-1 and 53-2, the conductive path 531b extends from the tip (upper end in Figure 3) of the conductive path 531a in the direction opposite to the second direction X.

[0042] In stubs 53-3 and 53-4, the conductive path 531a extends in the third direction Y from the second side 52b of the connecting line 52. The conductive path 531a is not directly connected to the connecting line 52. The conductive path 531b extends in the second direction X from the tip (lower end in Figure 3) of the conductive path 531a.

[0043] The physical lengths of the conductive paths 531a and 531b are set appropriately according to the target electrical length of the stub 53. In this embodiment, the physical length of conductive path 531a is shorter than the physical length of conductive path 531b. In particular, the physical length of conductive path 531a is set so that the stub 53 fits inside the first ground electrode 51 in the third direction Y when viewed from the second direction X. More specifically, in the third direction Y, the stubs 53-1 and 53-2 fit between the side (first side 52a) of the connecting line 52 to which the stubs 53-1 and 53-2 are connected and the side (first side 51a) of the first ground electrode 51 that is on the same side as that side (first side 52a). In the third direction Y, stubs 53-3 and 53-4 are positioned between the side (second side 52b) of the connecting line 52 to which stubs 53-3 and 53-4 are connected, and the side (second side 51b) of the first ground electrode 51 which is on the same side as that side (second side 52b). This configuration enables miniaturization of the substrate 2 in the third direction Y.

[0044] 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. In other words, the chip component 532 is mounted on the substrate 2 so as to connect the conductive path 531a and the connecting line 52. The chip component 532 includes at least one of an inductor, a capacitor, or a 0Ω resistor. This configuration facilitates the setting of the resonant frequency of the stub 53. That is, the electrical length of the stub 53 can be adjusted by appropriately changing the chip component 532 without changing the physical length of the conductive paths 531a and 531b. The configuration in which the chip component 532 is located between the conductive path 531a and the connecting line 52 further facilitates the setting of the resonant frequency of the stub 53.

[0045] In each stub 53, the conductive path 531b is aligned with the second direction X. That is, at least a portion of the stub 53 is aligned with the second direction X. The portion of the stub 53 aligned with the second direction X (conductive path 531b) may generate capacitance with respect to the connecting line 52. The capacitance between the stub 53 and the connecting line 52 may affect the resonant frequency of the stub 53. The capacitance between the stub 53 and the connecting line 52 may increase if the portion of the stub 53 aligned with the second direction X is longer, or if the distance between the portion of the stub 53 aligned with the second direction X and the connecting line 52 is shorter. If the capacitance between the stub 53 and the connecting line 52 increases, the resonant frequency tends to increase even if the electrical length of the stub 53 remains the same. Therefore, this configuration allows for a reduction in the electrical length of the stub 53 necessary to set the resonant frequency of the stub 53 to the desired resonant frequency.

[0046] Next, we will explain the placement of stub 53.

[0047] The grounding section 5 includes a plurality of stubs 53, namely four stubs 53-1 to 53-4. Stubs 53-1 and 53-2 are connected to the first side 52a of the connecting line 52, and stubs 53-3 and 53-4 are connected to the second side 52b of the connecting line 52. Hereinafter, the stub connected to the first side 52a may be referred to as the first stub, and the stub connected to the second side 52b may be referred to as the second stub. In Figure 3, stubs 53-1 and 53-2 are the first stubs, and stubs 53-3 and 53-4 are the second stubs. This configuration enables improved electrical symmetry in the antenna substrate 1 and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0048] As described above, the connecting line 52 has a shape that is symmetrical with respect to a line passing through the center C3 of the first radiating electrode 3 and parallel to the second direction X. Therefore, the distribution of current flowing through the connecting line 52 tends to be symmetrical with respect to a line passing through the center C5 of the connecting line 52 and parallel to the second direction X. This makes it easier for current to flow evenly between the first stub and the second stub. This makes it possible to further improve the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4. In this embodiment, since the connecting line 52 has a shape that is symmetrical with respect to a line passing through the center C3 of the first radiating electrode 3 and parallel to the second direction X, current flows more evenly between the first stub and the second stub.

[0049] The number of first stubs is 2. The number of second stubs is 2. The number of first stubs and the number of second stubs are equal. This configuration enables improved electrical symmetry in the antenna substrate 1 and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0050] The first connection position with the connecting line 52 in one or more first stubs 53-1, 53-2 and the second connection position with the connecting line 52 in one or more second stubs 53-3, 53-4 are different in the second direction X. More specifically, the first connection position with the connecting line 52 in stubs 53-1, 53-2 (the position of the tip component 532 in stubs 53-1, 53-2) is different in the second direction X from the second connection position with the connecting line 52 in stubs 53-3, 53-4 (the position of the tip component 532 in stubs 53-3, 53-4). If the first connection position and the second connection position coincide in the second direction X, the current flowing from the first side 52a of the connecting line 52 to the second stubs 53-3 and 53-4 and the current flowing from the second side 52b of the connecting line 52 to the first stubs 53-1 and 53-2 may cancel each other out, potentially reducing the amount of current flowing through the stub 53. In Figure 3, the first connection position and the second connection position are different in the second direction X. This configuration allows for efficient current flow from the first side 52a of the connecting line 52 to the first stubs 53-1 and 53-2, and from the second side 52b of the connecting line 52 to the second stubs 53-3 and 53-4. Therefore, this configuration enables further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4. The first connection position and the second connection position are point-symmetric with respect to the center C5 of the connecting line 52 as viewed from the first direction Z. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0051] Two or more of the four stubs 53-1 to 53-4, stubs 53-1, 53-2, are connected to the same side (first side 52a) of the connecting line 52 and aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4. The remaining two or more of the four stubs 53-1 to 53-4, stubs 53-3, 53-4, are connected to another side (second side 52b) of the connecting line 52 and aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0052] In the second direction X, the spacing W1 between two or more stubs 53 is greater than the width W2 between the two or more stubs 53. In Figure 3, the spacing W1 between stubs 53-3 and 53-4 in the second direction X is greater than the width W2 of each stub 53-3 and 53-4. Here, the width W2 of each 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. Although not clearly shown in Figure 3, the spacing between stubs 53-1 and 53-2 in the second direction X is also greater than the width of each stub 53-1 and 53-2. This configuration can reduce performance degradation due to interactions between two or more stubs 53 in the second direction X (e.g., capacitive coupling). This enables further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0053] The first feed point 61 is the feed point of the first radiating electrode 3. The first feed point 61 is used to supply a high-frequency signal to the first radiating electrode 3. For example, the inner conductor of a coaxial cable is connected to the first radiating electrode 3 via the first feed point 61. As shown in Figure 1, 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 on the first main surface 21 of the dielectric layer 20 and connected to the first radiating electrode 3. The second end of the first feed point 61 is exposed on the second main surface 22 of the dielectric layer 20 but is not connected to the first ground electrode 51. In Figure 3, the first ground electrode 51 has an opening 51c around the first feed point 61 on the second main surface 22 so that it is separated from the first feed point 61. In this embodiment, when viewed from the first direction Z, the center C3 of the first radiating electrode 3 and the first feed point 61 (the feed point of the first radiating electrode 3) are aligned along the second direction X. This configuration allows the direction in which the size of the first radiating electrode 3 is adjusted according to the frequency band of the wireless communication using the first radiating electrode 3 to be the second direction X, rather than the third direction Y. Therefore, this configuration enables miniaturization of the substrate 2 in the third direction Y.

[0054] The second feed point 62 is the feed point for the second radiating electrode 4. The second feed point 62 is used to supply a high-frequency signal to the second radiating electrode 4. For example, the inner conductor of a coaxial cable is connected to the second radiating electrode 4 via the second feed point 62. As shown in Figure 1, 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 on the first main surface 21 of the dielectric layer 20 and connected to the second radiating electrode 4. The second end of the second feed point 62 is exposed on the second main surface 22 of the dielectric layer 20 but is not connected to the second ground electrode 54. In Figure 3, the second ground electrode 54 has an opening 54c around the second feed point 62 on the second main surface 22 so that it is separated from the second feed point 62. In this embodiment, when viewed from the first direction Z, the center C4 of the second radiating electrode 4 and the second feed point 62 (the feed point of the second radiating electrode 4) are aligned along the second direction X. This configuration allows the direction in which the size of the second radiating electrode 4 is adjusted according to the frequency band of the wireless communication using the second radiating electrode 4 to be the second direction X, rather than the third direction Y. Therefore, this configuration enables miniaturization of the substrate 2 in the third direction Y.

[0055] In Figure 3, the first feed point 61 is located on the opposite side of the second direction X from the center C3 of the first radiating electrode 3, and the second feed point 62 is located on the opposite side of the second direction X from the center C4 of the second radiating electrode 4. In other words, the first feed point 61 and the second feed point 62 are on the same side with respect to the center of the corresponding radiating electrode. The first feed point 61 and the second feed point 62 may also be on opposite sides of the center of the corresponding radiating electrode. For example, the second feed point 62 may be located on the second direction X side from the center C4 of the second radiating electrode 4. The positional relationship between each feed point and the center of the corresponding radiating electrode is not particularly limited and may be set appropriately according to the wavelength length corresponding to the frequency band of wireless communication using the radiating electrodes and the distance between the radiating electrodes. However, in order to avoid the generation of noise, the position of the feed points should not overlap with the positions of the nth harmonics (n is an integer of 2 or more), such as the second or third harmonics, of the above wavelength on the radiating electrodes.

[0056] Electronic components 11 and 12 are mounted on the antenna substrate 1 as shown in Figure 1. More specifically, electronic components 11 and 12 are placed on the protective layer 23 of the substrate 2 of the 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, the process of wireless communication using the antenna substrate 1. Electronic component 11 is connected to a first feed point 61 and a second feed point 62. Electronic component 11 can output high-frequency signals to the first radiating electrode 3 and the second radiating electrode 4 through the first feed point 61 and the second feed point 62. Electronic component 11 can receive high-frequency signals from the first radiating electrode 3 and the second radiating electrode 4 through the first feed point 61 and the second feed point 62. Electronic component 12 is, for example, a connector. Electronic component 12 is used to connect the antenna module 10 to an external device (such as the control circuit of the device equipped with the antenna module 10).

[0057] [1.1.2 Effects, etc.] The antenna substrate 1 described above comprises a substrate 2, a planar first radiating electrode 3 disposed on the substrate 2, a second radiating electrode 4 disposed on the substrate 2 spatially separated from the first radiating electrode 3 in the second direction X when viewed from the first direction Z along the thickness direction of the substrate 2, and a grounding portion 5 disposed on the substrate 2 common to the first radiating electrode 3 and the second radiating electrode 4. The grounding portion 5 includes a grounding electrode 51 facing the first radiating electrode 3 when viewed from the first direction Z, a connecting line 52 located between the first radiating electrode 3 and the second radiating electrode 4 when viewed from the first direction Z, and smaller in size than the grounding electrode 51 in the third direction Y which is perpendicular to the second direction X when viewed from the first direction Z, and a stub 53 connected to one of the first side 52a and second side 52b of the connecting line 52 that face each other in the third direction Y. This configuration allows for miniaturization while improving the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0058] In the antenna substrate 1, the connecting line 52 is smaller in size than the first radiating electrode 3 in the third direction Y. This configuration enables miniaturization of the substrate 2 in the third direction Y.

[0059] In the antenna substrate 1, the grounding portion 5 includes a plurality of stubs 53. The plurality of stubs 53 include one or more first stubs 53-1, 53-2 connected to the first side 52a of the connecting line 52, and one or more second stubs 53-3, 53-4 connected to the second side 53b of the connecting line 52. This configuration enables improved electrical symmetry in the antenna substrate 1 and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0060] In the antenna substrate 1, the number of first stubs 53-1, 53-2 (one or more) is equal to the number of second stubs 53-3, 53-4 (one or more). This configuration enables improved electrical symmetry in the antenna substrate 1 and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0061] In the antenna substrate 1, the first connection position between the connecting line 52 and one or more first stubs 53-1, 53-2 and the second connection position between the connecting line 52 and one or more second stubs 53-3, 53-4 are different in the second direction X. This configuration enables further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0062] In the antenna substrate 1, the first connection position and the second connection position are point-symmetric with respect to the center C5 of the connection line 52 as viewed from the first direction Z. This configuration enables further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0063] In the antenna substrate 1, the stub 53 includes one or more conductive paths 531a, 531b formed on the substrate 2, and one or more chip components 532 mounted on the substrate 2, wherein the one or more chip components 532 include at least one of an inductor, a capacitor, or a 0Ω resistor. This configuration facilitates setting the resonant frequency of the stub 53.

[0064] In the antenna substrate 1, at least one of the one or more chip components 532 is located between one or more conductive paths 531a, 531b and a connecting line 52. This configuration allows for further simplification of setting the resonant frequency of the stub 53.

[0065] In the antenna substrate 1, at least a portion 531b of the stub 53 is aligned with the second direction X. This configuration allows for a reduction in the electrical length of the stub 53 required to set the resonant frequency of the stub 53 to the desired resonant frequency.

[0066] In the antenna substrate 1, when viewed from the first direction Z, the center C3 of the first radiating electrode 3 and the center C5 of the connecting line 52 are aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0067] In the antenna substrate 1, when viewed from the first direction Z, the connecting line 52 has a shape that is symmetrical with respect to a line passing through the center C3 of the first radiating electrode 3 and parallel to the second direction X. This configuration enables further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0068] In the antenna substrate 1, when viewed from the first direction Z, the center C3 of the first radiating electrode 3 and the feed point 61 of the first radiating electrode 3 are aligned along the second direction X. This configuration enables miniaturization of the substrate 2 in the third direction Y.

[0069] In the antenna substrate 1, when viewed from the first direction Z, the center C4 of the second radiating electrode 4 and the feed point 62 of the second radiating electrode 4 are aligned along the second direction X. This configuration enables miniaturization of the substrate 2 in the third direction Y.

[0070] In the antenna substrate 1, the grounding portion 5 includes a plurality of stubs 53, two or more of the stubs 53-1, 53-2 are connected to the first side 52a of the connecting line 52 and are aligned along the second direction X. Two or more of the stubs 53-3, 53-4 are connected to the second side 52b of the connecting line 52 and are aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0071] In the antenna substrate 1, the spacing W1 between two or more stubs 53 in the second direction X is greater than the width W2 between the two or more stubs 53. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0072] In the antenna substrate 1, the second radiating electrode 4 is planar, the grounding electrode 51 is the first grounding electrode 51, the grounding portion 5 includes a second grounding electrode 54 facing the second radiating electrode 4 when viewed from the first direction Z, and the connecting line 52 connects the first grounding electrode 51 and the second grounding electrode 54. This configuration enables improved electrical symmetry in the antenna substrate 1 and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0073] In the antenna substrate 1, the second direction X is the length direction of the substrate 2, and the third direction Y is the width direction of the substrate 2. This configuration enables miniaturization of the substrate 2.

[0074] The antenna module 10 described above comprises an antenna substrate 1 and electronic components 11 and 12 mounted on the antenna substrate 1. This configuration allows for miniaturization while improving the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0075] [1.2 Embodiment 2] [1.2.1 Structure] Figure 4 is a bottom view of an example configuration of antenna substrate 1A according to Embodiment 2. Antenna substrate 1A can be used in place of antenna substrate 1 in antenna module 10. Antenna substrate 1A comprises a substrate 2, a first radiating electrode 3, a second radiating electrode 4, a grounding portion 5A, a first feed point 61, and a second feed point 62.

[0076] The grounding section 5A includes a grounding electrode 51, a connecting line 52, and a plurality of stubs 53A-1 to 53A-4 (hereinafter collectively referred to as 53A). Furthermore, the grounding section 5A includes a second grounding electrode 54 separate from the first grounding electrode 51.

[0077] The stub 53A is connected to one of the first side 52a and the second side 52b of the connecting line 52, which are opposite to each other in the third direction Y.

[0078] First, let's describe the configuration of stub 53A. Stubs 53A-1, 53A-2, 53A-3, and 53A-4 have the same configuration. 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 the chip component 532. This configuration allows for a simplification of the structure of stub 53A.

[0079] In stubs 53A-1 and 53A-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 directly connected to the connecting line 52. In stubs 53A-1 and 53A-2, the conductive path 531b extends from the tip (upper end in Figure 4) of the conductive path 531a in the direction opposite to the second direction X.

[0080] In stubs 53A-3 and 53A-4, the conductive path 531a extends in the third direction Y from the second side 52b of the connecting line 52. The conductive path 531a is directly connected to the connecting line 52. The conductive path 531b extends in the second direction X from the tip (lower end in Figure 4) of the conductive path 531a.

[0081] The physical lengths of the conductive paths 531a and 531b are set appropriately according to the target electrical length of the stub 53A. In this embodiment, the physical length of conductive path 531a is shorter than the physical length of conductive path 531b. In particular, in this embodiment, the physical length of conductive path 531a is set so that the stub 53A is contained inside the first ground electrode 51 in the third direction Y when viewed from the second direction X. This configuration enables miniaturization of the substrate 2 in the third direction Y.

[0082] In each stub 53A, the conductive path 531b is aligned with the second direction X. That is, at least a portion of the stub 53A is aligned with the second direction X. This configuration allows for a reduction in the electrical length of the stub 53 required to set the resonant frequency of the stub 53 to the desired resonant frequency.

[0083] Next, we will explain the arrangement of stub 53A.

[0084] Stubs 53A-1 and 53A-2 are connected to the first side 52a of the connecting line 52, and 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, and stubs 53A-3 and 53A-4 are second stubs. This configuration enables improved electrical symmetry in the antenna substrate 1A and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4. The number of first stubs is 2. The number of second stubs is 2. The number of first stubs and the number of second stubs are equal. This configuration enables improved electrical symmetry in the antenna substrate 1A and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0085] The first connection position between the connecting line 52 and one or more first stubs 53A-1, 53A-2 and the second connection position between the connecting line 52 and one or more second stubs 53A-3, 53A-4 differs in the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4. The first connection position and the second connection position are point-symmetric with respect to the center C5 of the connecting line 52 as viewed from the first direction Z. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0086] Two or more of the four stubs 53A-1 to 53A-4, stubs 53A-1, 53A-2, are connected to the same side (first side 52a) of the connecting line 52 and aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4. The remaining two or more of the four stubs 53A-1 to 53A-4, stubs 53A-3, 53A-4, are connected to another side (second side 52b) of the connecting line 52 and aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0087] In the second direction X, the spacing W1 between two or more stubs 53A is greater than the width W2 between the two or more stubs 53A. In Figure 4, the spacing W1 between stubs 53A-3 and 53A-4 in the second direction X is greater than the width W2 of each stub 53A-3 and 53A-4. Here, the width W2 of each 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. Although not clearly shown in Figure 4, the spacing between stubs 53A-1 and 53A-2 in the second direction X is also greater than the width of each stub 53A-1 and 53A-2. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0088] [1.2.2 Effects, etc.] The antenna substrate 1A described above comprises a substrate 2, a planar first radiating electrode 3 disposed on the substrate 2, a second radiating electrode 4 disposed on the substrate 2 spatially separated from the first radiating electrode 3 in the second direction X when viewed from the first direction Z along the thickness direction of the substrate 2, and a grounding portion 5A disposed on the substrate 2 common to the first radiating electrode 3 and the second radiating electrode 4. The grounding portion 5A includes a grounding electrode 51 facing the first radiating electrode 3 when viewed from the first direction Z, a connecting line 52 located between the first radiating electrode 3 and the second radiating electrode 4 when viewed from the first direction Z, and smaller in size than the grounding electrode 51 in the third direction Y which is perpendicular to the second direction X when viewed from the first direction Z, and a stub 53A connected to one of the first side 52a and second side 52b of the connecting line 52 that face each other in the third direction Y. This configuration enables improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0089] [1.3 Embodiment 3] [1.3.1 Configuration] Figure 5 is a bottom view of an example configuration of the antenna substrate 1B according to Embodiment 3. The antenna substrate 1B can be used in place of the antenna substrate 1 in the antenna module 10. The antenna substrate 1B comprises a substrate 2, a first radiating electrode 3, a second radiating electrode 4, a grounding portion 5B, a first feed point 61, and a second feed point 62.

[0090] The grounding section 5B includes a first grounding electrode 51, a connecting line 52, and a plurality of stubs 53B-1 to 53B-4 (hereinafter collectively referred to as 53B). Furthermore, the grounding section 5B includes a second grounding electrode 54 separate from the first grounding electrode 51.

[0091] The stub 53B is connected to one of the first side 52a and the second side 52b of the connecting line 52, which are opposite to each other in the third direction Y.

[0092] First, let's describe the configuration of the stub 53B. Stubs 53B-1, 53B-2, 53B-3, and 53B-4 have the same configuration. The stub 53B is straight and not bent. The stub 53B includes the conductive path 531c and the chip component 532.

[0093] The conductive path 531c is formed on the substrate 2. The conductive path 531c is a conductive 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.

[0094] In stubs 53B-1 and 53B-2, the conductive path 531c extends from the first side 52a of the connecting line 52 in the direction opposite to the third direction Y. The conductive path 531c is not directly connected to the connecting line 52. In stubs 53B-3 and 53B-4, the conductive path 531c extends from the second side 52b of the connecting line 52 in the third direction Y. The conductive path 531c is not directly connected to the connecting line 52.

[0095] 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 531c and the connecting line 52. In other words, the chip component 532 is mounted on the substrate 2 so as to connect the conductive path 531c and the connecting line 52.

[0096] In each stub 53B, the conductive path 531c is aligned with the third direction Y. In Figure 5, the stub 53B is not located inside the first ground electrode 51 in the third direction Y when viewed from the second direction X. Therefore, if the electrical length of stub 53B and the electrical length of stub 53 are the same, the size of the substrate 2 of antenna substrate 1B in the third direction will be larger than the size of the substrate 2 of antenna substrate 1 in the third direction. On the other hand, since the stub 53B is straight and not bent, its electrical characteristics may be better than those of stub 53.

[0097] Next, we will explain the placement of stub 53B.

[0098] Stubs 53B-1 and 53B-2 are connected to the first side 52a of the connecting line 52, and 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, and stubs 53B-3 and 53B-4 are second stubs. This configuration enables improved electrical symmetry in the antenna substrate 1B and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4. The number of first stubs is 2. The number of second stubs is 2. The number of first stubs and the number of second stubs are equal. This configuration enables improved electrical symmetry in the antenna substrate 1B and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0099] The first connection position between the connecting line 52 and one or more first stubs 53B-1, 53B-2 and the second connection position between the connecting line 52 and one or more second stubs 53B-3, 53B-4 are different in the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4. The first connection position and the second connection position are point-symmetric with respect to the center C5 of the connecting line 52 as viewed from the first direction Z. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0100] Two or more of the four stubs 53B-1 to 53B-4, stubs 53B-1, 53B-2, are connected to the same side (first side 52a) of the connecting line 52 and aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4. The remaining two or more of the four stubs 53B-1 to 53B-4, stubs 53B-3, 53B-4, are connected to another side (second side 52b) of the connecting line 52 and aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0101] In the second direction X, the spacing W1 between two or more stubs 53B is greater than the width W2 between the two or more stubs 53B. In Figure 5, the spacing W1 between stubs 53B-3 and 53B-4 in the second direction X is greater than the width W2 of each stub 53B-3 and 53B-4. Here, the width W2 of each stub 53B-3 and 53B-4 is the width of the conductive path 531c. Although not clearly shown in Figure 5, the spacing between stubs 53B-1 and 53B-2 in the second direction X is also greater than the width of each stub 53B-1 and 53B-2. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0102] [1.3.2 Effects, etc.] The antenna substrate 1B described above comprises a substrate 2, a planar first radiating electrode 3 disposed on the substrate 2, a second radiating electrode 4 disposed on the substrate 2 spatially separated from the first radiating electrode 3 in the second direction X when viewed from the first direction Z along the thickness direction of the substrate 2, and a grounding portion 5B disposed on the substrate 2 common to the first radiating electrode 3 and the second radiating electrode 4. The grounding portion 5B includes a grounding electrode 51 facing the first radiating electrode 3 when viewed from the first direction Z, a connecting line 52 located between the first radiating electrode 3 and the second radiating electrode 4 when viewed from the first direction Z, and smaller in size than the grounding electrode 51 in the third direction Y which is perpendicular to the second direction X when viewed from the first direction Z, and a stub 53B connected to one of the first side 52a and second side 52b of the connecting line 52 that face each other in the third direction Y. This configuration enables improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0103] [1.4 Embodiment 4] [1.4.1 Configuration] Figure 6 is a bottom view of an example configuration of the antenna substrate 1C according to Embodiment 4. The antenna substrate 1C can be used in place of the antenna substrate 1 in the antenna module 10. The antenna substrate 1C comprises a substrate 2, a first radiating electrode 3, a second radiating electrode 4, a grounding portion 5C, a first feed point 61, and a second feed point 62.

[0104] The grounding section 5C includes a first grounding electrode 51, a connecting line 52, and a plurality of stubs 53C-1 to 53C-6 (hereinafter collectively referred to as 53C). Furthermore, the grounding section 5B includes a second grounding electrode 54 separate from the first grounding electrode 51.

[0105] The stub 53C is connected to one of the first side 52a and the second side 52b of the connecting line 52, which are opposite to each other in the third direction Y.

[0106] First, the configuration of stub 53C will be described. Stubs 53C-1, 53C-2, 53C-3, 53C-4, 53C-5, and 53C-6 have similar configurations. Stub 53C has a bent shape. In particular, stub 53C is L-shaped when viewed from the first direction Z. Stub 53C includes conductive paths 531a and 531b and a chip component 532, similar to stub 53 in Figure 3.

[0107] Two or more of the two or more stubs 53C have different electrical lengths. This configuration allows for improved isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4 over a wider frequency band. Stubs 53C-1, 53C-3, 53C-4, and 53C-6 have different electrical lengths than stubs 53C-2 and 53C-5. Assume that the electrical lengths of stubs 53C-1, 53C-3, 53C-4, and 53C-6 are the same as the electrical lengths of stub 53 on antenna substrate 1. Antenna substrate 1C can further attenuate high-frequency signals on the connecting line 52 near the resonant frequencies of stubs 53C-2 and 53C-5, which are different from stub 53. Therefore, antenna substrate 1C allows for improved isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4 over a wider frequency band than antenna substrate 1.

[0108] Next, we will explain the placement of stub 53C.

[0109] Stubs 53C-1, 53C-2, and 53C-3 are connected to the first side 52a of the connecting line 52, and 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, and stubs 53C-4, 53C-5, and 53C-6 are second stubs. This configuration enables improved electrical symmetry in the antenna substrate 1C and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4. The number of first stubs is 3. The number of second stubs is 3. The number of first stubs and the number of second stubs are equal. This configuration enables improved electrical symmetry in the antenna substrate 1C and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0110] The first connection positions of the first stubs 53C-1, 53C-2, 53C-3 with the connecting line 52 and the second connection positions of the second stubs 53C-4, 53C-5, 53C-6 with the connecting line 52 are different in the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4. The first connection positions and the second connection positions are point-symmetric with respect to the center C5 of the connecting line 52 as viewed from the first direction Z. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0111] Two or more of the six stubs 53C-1 to 53C-6, stubs 53C-1 to 53C-3, are connected to the same side (first side 52a) of the connecting line 52 and aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4. The remaining two or more of the six stubs 53C-1 to 53C-6, stubs 53C-4 to 53C-6, are connected to another side (second side 52b) of the connecting line 52 and aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0112] The spacing W1 between two or more stubs 53C in the second direction X is greater than the width W2 between the two or more stubs 53C. The spacing W1 between stubs 53C-4 and 53C-5 in the second direction X is greater than the width W2 of each stub 53C-4 and 53C-5. Here, the width W2 of each 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. Although not clearly shown in Figure 6, the spacing between other stubs 53C in the second direction X is also greater than the width of each stub 53C. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0113] [1.4.2 Effects, etc.] The antenna substrate 1C described above comprises a substrate 2, a planar first radiating electrode 3 disposed on the substrate 2, a second radiating electrode 4 disposed on the substrate 2 spatially separated from the first radiating electrode 3 in the second direction X when viewed from the first direction Z along the thickness direction of the substrate 2, and a grounding portion 5C disposed on the substrate 2 common to the first radiating electrode 3 and the second radiating electrode 4. The grounding portion 5C includes a grounding electrode 51 facing the first radiating electrode 3 when viewed from the first direction Z, a connecting line 52 located between the first radiating electrode 3 and the second radiating electrode 4 when viewed from the first direction Z, and smaller in size than the grounding electrode 51 in the third direction Y which is perpendicular to the second direction X when viewed from the first direction Z, and a stub 53C connected to one of the first side 52a and second side 52b of the connecting line 52 that face each other in the third direction Y. This configuration enables improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0114] In the antenna substrate 1C, two or more of the two or more stubs 53C have different electrical lengths. This configuration allows for improved isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4 over a wider frequency band.

[0115] [1.5 Embodiment 5] [1.5.1 Configuration] Figure 7 is a bottom view of an example configuration of the antenna substrate 1D according to Embodiment 5. The antenna substrate 1D can be used in place of the antenna substrate 1 in the antenna module 10. The antenna substrate 1D comprises a substrate 2, a first radiating electrode 3, a second radiating electrode 4, a grounding portion 5D, a first feed point 61, and a second feed point 62.

[0116] The grounding section 5D includes a grounding electrode 51, a connecting line 52, and a plurality of stubs 53D-1 to 53D-4 (hereinafter collectively referred to as 53D). Furthermore, the grounding section 5D includes a second grounding electrode 54 separate from the first grounding electrode 51.

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

[0118] First, let's describe the configuration of stub 53D. Stubs 53D-1, 53D-2, 53D-3, and 53D-4 have the same configuration. Stub 53D has a bent shape. Stub 53D includes conductive paths 531a and 531d, and a chip component 532.

[0119] Conductive paths 531a and 531d are formed on the substrate 2. Conductive paths 531a and 531d are conductor patterns formed on the second main surface 22 of the dielectric layer 20. More specifically, conductive path 531a extends from the connecting line 52 along the third direction Y. Conductive path 531b extends from the tip of conductive path 531d along the second direction X. Conductive path 531a is straight. Conductive path 531d has a shape that is bent one or more times. Conductive path 531d has a shape that meanders with respect to the second direction X. In stubs 53D-1 and 53D-2, conductive path 531a extends from the first side 52a of the connecting line 52 in the direction opposite to the third direction Y. Conductive path 531a is not directly connected to the connecting line 52. In stubs 53D-1 and 53D-2, the conductive path 531d extends from the tip of the conductive path 531a (upper end in Figure 7) in the direction opposite to the second direction X. In 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 tip of the conductive path 531a (lower end in Figure 7) in the second direction X.

[0120] The physical lengths of the conductive paths 531a and 531d are set appropriately according to the target electrical length of the stub 53D. The physical length of conductive path 531a is shorter than the physical length of conductive path 531d. In particular, the physical length of conductive path 531a is set so that the stub 53D fits inside the first ground electrode 51 in the third direction Y when viewed from the second direction X. This configuration enables miniaturization of the substrate 2 in the third direction Y. Conductive path 531d extends along the second direction X, similar to conductive path 531b in Figure 3, but unlike conductive path 531b, which is straight, it has a shape that is bent one or more times. Therefore, if conductive path 531d in Figure 7 and conductive path 531b in Figure 3 have the same physical length, the length of conductive path 531d in the second direction X can be shorter than the length of conductive path 531b in the second direction X in Figure 3. Therefore, this configuration allows for a reduction in the maximum length of one side of the area required for the placement of the stub 53D.

[0121] The conductive path 531d is aligned with the second direction X. That is, at least a portion of the stub 53D is aligned with the second direction X. The portion of the stub 53D aligned with the second direction X (the portion of the conductive path 531d on the side of the connecting line 52) can create capacitance with the connecting line 52. Therefore, this configuration allows for a reduction in the electrical length of the stub 53D required to set the resonant frequency of the stub 53D to the desired resonant frequency.

[0122] 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.

[0123] Next, we will explain the placement of stub 53D.

[0124] Stubs 53D-1 and 53D-2 are connected to the first side 52a of the connecting line 52, and 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, and stubs 53D-3 and 53D-4 are second stubs. This configuration enables improved electrical symmetry in the antenna substrate 1D and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4. The number of first stubs is 2. The number of second stubs is 2. The number of first stubs and the number of second stubs are equal. This configuration enables improved electrical symmetry in the antenna substrate 1D and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0125] The first connection position between the connecting line 52 and one or more first stubs 53D-1, 53D-2 and the second connection position between the connecting line 52 and one or more second stubs 53D-3, 53D-4 are different in the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4. The first connection position and the second connection position are point-symmetric with respect to the center C5 of the connecting line 52 as viewed from the first direction Z. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0126] Two or more of the four stubs 53D-1 to 53D-4, stubs 53D-1, 53D-2, are connected to the same side (first side 52a) of the connecting line 52 and aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4. The remaining two or more of the four stubs 53D-1 to 53D-4, stubs 53D-3, 53D-4, are connected to another side (second side 52b) of the connecting line 52 and aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0127] The spacing W1 between two or more stubs 53D in the second direction X is greater than the width W2 of the two or more stubs 53D. In Figure 7, the spacing W1 between stubs 53D-3 and 53D-4 in the second direction X is greater than the width W2 of each stub 53D-3 and 53D-4. Here, the width W2 of each stub 53D-3 and 53D-4 is the width of the conductive path 531d. Although not clearly shown in Figure 7, the spacing between other stubs 53D in the second direction X is also greater than the width of each stub 53D. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0128] [1.5.2 Effects, etc.] The antenna substrate 1D described above comprises a substrate 2, a planar first radiating electrode 3 disposed on the substrate 2, a second radiating electrode 4 disposed on the substrate 2 spatially separated from the first radiating electrode 3 in the second direction X when viewed from the first direction Z along the thickness direction of the substrate 2, and a grounding portion 5D disposed on the substrate 2 common to the first radiating electrode 3 and the second radiating electrode 4. The grounding portion 5D includes a grounding electrode 51 facing the first radiating electrode 3 when viewed from the first direction Z, a connecting line 52 located between the first radiating electrode 3 and the second radiating electrode 4 when viewed from the first direction Z, and smaller in size than the grounding electrode 51 in the third direction Y which is perpendicular to the second direction X when viewed from the first direction Z, and a stub 53D connected to one of the first side 52a and second side 52b of the connecting line 52 that face each other in the third direction. This configuration enables improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0129] In the antenna substrate 1D, the stub 53D has a shape that is bent two or more times. This configuration makes it possible to shorten the maximum length of one side of the area required for the placement of the stub 53D.

[0130] [1.6 Embodiment 6] [1.6.1 Configuration] Figure 8 is a perspective view of an example configuration of the antenna substrate 1E according to Embodiment 6. Figure 9 is a plan view of the antenna substrate 1E. Figure 10 is a bottom view of the antenna substrate 1E. The antenna substrate 1E can be used in place of the antenna substrate 1 in the antenna module 10.

[0131] As shown in Figures 8, 9, and 10, the antenna substrate 1E comprises a substrate 2, a first radiating electrode 3, a second radiating electrode 4, a grounding portion 5E, a first feed point 61, and a second feed point 62.

[0132] As shown in Figures 8 to 10, the grounding section 5E is provided on the substrate 2. The grounding section 5E includes a grounding electrode 51, a connecting line 52, and a plurality of stubs 53E-1 to 53E-4 (hereinafter collectively referred to as reference numeral 53E). Furthermore, the grounding section 5E includes a second grounding electrode 54 separate from the first grounding electrode 51.

[0133] The stub 53E is connected to one of the first side 52a and the second side 52b of the connecting line 52, which are opposite to each other in the third direction.

[0134] First, the configuration of stub 53E will be described. Stubs 53E-1, 53E-2, 53E-3, and 53E-4 have the same configuration. Stub 53E has a bent shape. In particular, 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 a chip component 532.

[0135] Conductive paths 531e, 531f, and 531g are formed on the substrate 2. As shown in Figures 8 and 10, conductive path 531e is a conductor pattern formed on the second main surface 22 of the dielectric layer 20. More specifically, conductive path 531e extends from the connecting line 52 along the third direction Y. Conductive path 531e is linear. As shown in Figure 8, conductive path 531f is a through-hole wiring that penetrates the dielectric layer 20 of the substrate 2. Conductive path 531f extends from the tip of conductive path 531e along a direction intersecting the plane containing the second direction X and the third direction Y. In this embodiment, conductive path 531f extends along the first direction Z. The first end of the conductive path 531f is exposed on the first main surface 21 of the dielectric layer 20 and connected to the conductive path 531g, and the second end of the conductive path 531f is exposed on the second main surface 22 of the dielectric layer 20 and connected to the conductive path 531e. As shown in Figures 8 and 9, 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.

[0136] In stubs 53E-1 and 53E-2, the conductive path 531e extends from the first side 52a of the connecting line 52 in the direction opposite to the third direction Y. The conductive path 531e is not directly connected to the connecting line 52. In stubs 53E-1 and 53E-2, the conductive path 531f extends from the tip (upper end in Figure 10) of the conductive path 531e in the first direction Z. In stubs 53E-1 and 53E-2, the conductive path 531g extends from the first end of the conductive path 531f in the direction opposite to the second direction X. In stubs 53E-3 and 53E-4, the conductive path 531e extends from the first side 52a of the connecting line 52 in the third direction Y. The conductive path 531e is not directly connected to the connecting line 52. In stubs 53E-3 and 53E-4, the conductive path 531f extends in the first direction Z from the tip (lower end in Figure 10) of the conductive path 531e. In stubs 53E-3 and 53E-4, the conductive path 531g extends in the second direction X from the first end of the conductive path 531f.

[0137] The physical lengths of the conductive paths 531e, 531f, and 531g are set appropriately according to the target electrical length of the stub 53E. Conductive path 531f is aligned in a direction intersecting the plane containing 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 is aligned in a direction intersecting the plane containing the second direction X and the third direction Y (in this embodiment, the first direction Z). Therefore, the area required for the placement of the stub 53E in the plane containing the second direction X and the third direction Y, that is, when viewed from the first direction Z, can be reduced.

[0138] The physical length of conductive path 531e is shorter than the physical lengths of conductive paths 531f and 531g. In particular, in this embodiment, the physical length of conductive path 531e is set such that stub 53E is located inside the first radiating electrode 3 in the third direction Y when viewed from the second direction X. More specifically, stubs 53E-1 and 53E-2 are located between the side (first side 52a) of the connecting line 52 to which stubs 53E-1 and 53E-2 are connected, and the side (first side 3a) of the first radiating electrode 3 that is on the same side as that side (first side 52a), in the third direction Y. In the third direction Y, stubs 53E-3 and 53E-4 are positioned between the side (second side 52b) of the connecting line 52 to which stubs 53E-3 and 53E-4 are connected, and the side (second side 3b) of the first radiating electrode 3 which is on the same side as that side (second side 52b). This configuration enables miniaturization of the substrate 2 in the third direction Y.

[0139] The chip component 532 is mounted on the substrate 2. In Figure 10, 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 531e and the connecting line 52.

[0140] In each stub 53E, the conductive path 531g is aligned with the second direction X. That is, at least a portion of the stub 53E is aligned with the second direction X. This configuration allows for a reduction in the electrical length of the stub 53E required to set the resonant frequency of the stub 53E to the desired resonant frequency.

[0141] Next, we will explain the placement of stub 53E.

[0142] Stubs 53E-1 and 53E-2 are connected to the first side 52a of the connecting line 52, and stubs 53E-3 and 53E-4 are connected to the second side 52b of the connecting line 52. In Figure 10, stubs 53E-1 and 53E-2 are the first stubs, and stubs 53E-3 and 53E-4 are the second stubs. This configuration enables improved electrical symmetry in the antenna substrate 1E and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4. The number of first stubs is 2. The number of second stubs is 2. The number of first stubs and the number of second stubs are equal. This configuration enables improved electrical symmetry in the antenna substrate 1E and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0143] The first connection position between the connecting line 52 and one or more first stubs 53E-1, 53E-2 and the second connection position between the connecting line 52 and one or more second stubs 53E-3, 53E-4 are different in the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4. The first connection position and the second connection position are point-symmetric with respect to the center C5 of the connecting line 52 as viewed from the first direction Z. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0144] Two or more of the four stubs 53E-1 to 53E-4, stubs 53E-1, 53E-2, are connected to the same side (first side 52a) of the connecting line 52 and aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4. The remaining two or more of the four stubs 53E-1 to 53E-4, stubs 53E-3, 53E-4, are connected to another side (second side 52b) of the connecting line 52 and aligned along the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0145] In the second direction X, the spacing W1 between two or more stubs 53E is greater than the width W2 between the two or more stubs 53E. In Figure 10, the spacing W1 between stubs 53E-3 and 53E-4 in the second direction X is greater than the width W2 of each stub 53E-3 and 53E-4. Here, the width W2 of each stub 53E-3 and 53E-4 is the width of the conductive path 531e. The width of the conductive path 531e may be equal to the widths of the conductive paths 531f and 531g. Although not clearly shown in Figure 10, the spacing between stubs 53E-1 and 53E-2 in the second direction X is also greater than the width of each stub 53E-1 and 53E-2. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0146] [1.6.2 Effects, etc.] The antenna substrate 1E described above comprises a substrate 2, a planar first radiating electrode 3 disposed on the substrate 2, a second radiating electrode 4 disposed on the substrate 2 spatially separated from the first radiating electrode 3 in the second direction X when viewed from a first direction Z along the thickness direction of the substrate 2, and a grounding portion 5E disposed on the substrate 2 common to the first radiating electrode 3 and the second radiating electrode 4. The grounding portion 5E includes a grounding electrode 51 facing the first radiating electrode 3 when viewed from the first direction Z, a connecting line 52 located between the first radiating electrode 3 and the second radiating electrode 4 when viewed from the first direction Z, and smaller in size than the grounding electrode 51 in the third direction Y which is perpendicular to the second direction X when viewed from the first direction Z, and a stub 53E connected to one of the first side 52a and second side 52b of the connecting line 52 that face each other in the third direction Y. This configuration enables improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4.

[0147] In the antenna substrate 1E, at least a portion of the stub 53E (conductive path 531f) is aligned in a direction intersecting the plane including the second direction X and the third direction Y. This configuration enables miniaturization of the substrate 2 in the third direction Y.

[0148] In the antenna substrate 1E, the stub 53E is positioned in the third direction Y between the edges (first edge 52a, second edge 52b) of the connecting line 52 to which the stub 53E is connected, and the edges (first edge 3a, second edge 3b) of the first radiating electrode 3, which are on the same side as those edges (first edge 52a, second edge 52b). This configuration enables miniaturization of the substrate 2 in the third direction Y.

[0149] [1.7 Embodiment 7] [1.7.1 Configuration] Figure 11 is a perspective view of an example configuration of the antenna substrate 1F according to Embodiment 7. Figure 12 is a plan view of the antenna substrate 1F. Figure 13 is a bottom view of the antenna substrate 1F. The antenna substrate 1F can be used in place of the antenna substrate 1 in the antenna module 10.

[0150] As shown in Figures 11, 12, and 13, the antenna substrate 1F comprises a substrate 2, a first radiating electrode 3, a second radiating electrode 4F, a grounding section 5F, a first feed point 61, a second feed point 62F, and a feed line 63.

[0151] As shown in Figures 11 to 13, the first radiating electrode 3 and the second radiating electrode 4F are located on different surfaces of the substrate 2. More specifically, the first radiating electrode 3 is located on the first main surface 21 of the dielectric layer 20 of the substrate 2. The second radiating electrode 4F is located on the second main surface 22 of the dielectric layer 20 of the substrate 2. Although the first radiating electrode 3 and the second radiating electrode 4F are located on different surfaces of the substrate 2, they are spaced apart in the second direction X. The second radiating electrode 4F is positioned on the substrate 2 spatially away from the first radiating electrode 3 in the second direction X when viewed from the first direction Z. The second radiating electrode 4F is on the opposite side of the connecting line 52F from the first radiating electrode 3, so as not to face the ground portion 5F when viewed from the first direction Z. The first radiating electrode 3 and the second radiating electrode 4F 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 length direction of the substrate 2, and the third direction Y is the width direction of the substrate 2. This configuration enables miniaturization of the substrate 2.

[0152] The second radiating electrode 4F is a conductive pattern formed on the second main surface 22 of the dielectric layer 20. The second radiating electrode 4F is planar. The second radiating electrode 4F is approximately rectangular when viewed from the first direction Z. As shown in Figure 13, the second radiating electrode 4F is symmetric with respect to a line passing through the center C4 of the second radiating 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 radiating electrode 3 and the center C4 of the second radiating electrode 4F are aligned along the second direction X. In other words, the straight line connecting the center C3 of the first radiating electrode 3 and the center C4 of the second radiating electrode 4F is parallel to the second direction X.

[0153] The shapes of the first radiating electrode 3 and the second radiating electrode 4F are determined according to the frequency band used for wireless communication. The first radiating electrode 3 and the second radiating electrode 4F have different shapes.

[0154] The second feed point 62F is the feed point for the second radiating electrode 4F. The second feed point 62F is used to supply a high-frequency signal to the second radiating electrode 4F. For example, the inner conductor of a coaxial cable is connected to the second radiating electrode 4F via the second feed point 62F. As shown in Figure 13, the second feed point 62F is located between the first radiating electrode 3 and the second radiating electrode 4F when viewed from the first direction Z. As schematically shown in Figures 11 to 13, the second feed point 62F is, for example, a through-hole wiring that penetrates the protective layer 23 (see Figure 1) covering the second main surface 22 of the dielectric layer 20 of the substrate 2. The second feed point 62F is connected to the second radiating electrode 4F by a feed path 63. The feed path 63 is a conductor pattern formed on the second main surface 22 of the dielectric layer 20.

[0155] Viewed from the first direction Z, the center C4 of the second radiating electrode 4F and the second feed point 62F (the feed point of the second radiating electrode 4F) are aligned along the second direction X. This configuration allows the direction in which the size of the second radiating electrode 4F is adjusted according to the frequency band of the wireless communication using the second radiating electrode 4F to be the second direction X, rather than the third direction Y. Therefore, this configuration enables miniaturization of the substrate 2 in the third direction Y. In the configuration where the center C4 of the second radiating electrode 4F and the second feed point 62F are aligned along the second direction X when viewed from the first direction Z, the feed line 63 extends along the second direction X.

[0156] As shown in Figure 13, the grounding point 5F is located on the second main surface 22 of the dielectric layer 20 of the substrate 2. The grounding point 5F is a common grounding point for the first radiating electrode 3 and the second radiating electrode 4F. In other words, the grounding point 5F is used as a ground for the first radiating electrode 3 and the second radiating electrode 4F.

[0157] The grounding section 5F in Figure 13 includes a grounding electrode 51, a connecting line 52F, and a plurality of stubs 53-1 to 53-4 (hereinafter collectively referred to as reference numeral 53).

[0158] The first ground electrode 51 faces the first radiating electrode 3 when viewed from the first direction Z. On the antenna substrate 1F, the first radiating electrode 3 and the first ground electrode 51 constitute a planar antenna (patch antenna). The first ground electrode 51 is a conductive 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 is approximately rectangular when viewed from the first direction Z. The size of the first ground electrode 51 is larger than the size of the first radiating electrode 3. When viewed from the first direction Z, the first radiating electrode 3 is located inside the first ground electrode 51.

[0159] The connecting line 52F is located between the first radiating electrode 3 and the second radiating 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 grounding electrode 51. The connecting line 52F is formed continuously and integrally with the first grounding electrode 51.

[0160] The connecting line 52F extends from the first ground electrode 51 towards the second radiating electrode 4F, but is not connected to the second radiating electrode 4F. In particular, when viewed from the first direction Z, the second feed point 62F and the feed line 63 are located between the first radiating electrode 3 and the second radiating electrode 4F. Although the connecting line 52F extends beyond the second feed point 62F towards the second radiating electrode 4F, it has a notch 52c around the second feed point 62F on the second main surface 22 so as to be separated from the second feed point 62F and the feed line 63.

[0161] The connecting line 52F extends from the first ground electrode 51 to the second radiating electrode 4F, thereby forming a monopole antenna with the second radiating electrode 4F and the connecting line 52F.

[0162] On antenna substrate 1F, the first ground electrode 51, together with the first radiating electrode 3, constitutes a planar antenna (patch antenna), and the connecting line 52F, together with the second radiating electrode 4F, constitutes a monopole antenna. Antenna substrate 1F is equipped with different types of antennas. Therefore, antenna substrate 1F is capable of radiating radio waves in two different directions.

[0163] Viewed from the first direction Z, the center C3 of the first radiating electrode 3 and the center C5 of the connecting line 52F are aligned along the second direction X. In other words, the straight line L1 connecting the center C3 of the first radiating electrode 3 and the center C5 of the connecting line 52F is parallel to the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4F.

[0164] The connecting line 52F has a shape that is symmetrical with respect to a line passing through the center C3 of the first radiating electrode 3 and parallel to the second direction X. This configuration allows for further improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4F.

[0165] The connecting line 52F is smaller in size than the first ground electrode 51 in the third direction Y. As shown in Figure 13, the dimension D1 of the connecting line 52F in the third direction Y is smaller than the dimension D2 of the first ground electrode 51 in the third direction Y. In this configuration, current is more likely to concentrate in the connecting line 52 than in the first ground electrode 51.

[0166] The connecting line 52F is smaller in size than the first radiating electrode 3 in the third direction Y. As shown in Figure 3, the dimension D1 of the connecting line 52 in the third direction Y is smaller than the dimension D3 of the first radiating electrode 3 in the third direction Y. This configuration enables miniaturization of the substrate 2 in the third direction Y.

[0167] The stub 53 is connected to one of the first side 52a and the second side 52b of the connecting line 52, which are opposite each other in the third direction Y. The grounding section 5F includes a plurality of stubs 53, i.e., four stubs 53-1 to 53-4. The stubs 53 are provided to improve the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4F. The configuration of the stub 53 in Figure 13 is the same as the configuration of the stub 53 in Figure 3.

[0168] [1.7.2 Effects, etc.] The antenna substrate 1F described above comprises a substrate 2, a planar first radiating electrode 3 disposed on the substrate 2, a second radiating electrode 4F disposed on the substrate 2 spatially separated from the first radiating electrode 3 in the second direction X when viewed from the first direction Z along the thickness direction of the substrate 2, and a grounding portion 5F disposed on the substrate 2 common to the first radiating electrode 3 and the second radiating electrode 4F. The grounding portion 5F includes a grounding electrode 51 facing the first radiating electrode 3 when viewed from the first direction Z, a connecting line 52 located between the first radiating electrode 3 and the second radiating electrode 4F when viewed from the first direction Z, and smaller in size than the grounding electrode 51 in the third direction Y which is perpendicular to the second direction X when viewed from the first direction Z, and a stub 53 connected to one of the first side 52a and second side 52b of the connecting line 52 that face each other in the third direction Y. This configuration enables improvement of the isolation characteristics between the first radiating electrode 3 and the second radiating electrode 4F.

[0169] In the antenna substrate 1F, the second radiating electrode 4F is positioned on the opposite side of the connecting line 52F from the first radiating electrode 3, so as viewed from the first direction Z, it does not face the ground portion 5F. This configuration enables miniaturization of the substrate 2.

[0170] [2. Variant] The embodiments of this disclosure are not limited to those described above. The embodiments can be modified in various ways depending on the design, etc., as long as the objectives of this disclosure can be achieved. The following lists some modifications of the embodiments. The modifications described below can be combined and applied as appropriate.

[0171] In the following, even if the reference numerals used in Embodiment 1 are applicable to any of Embodiments 1 to 7 described above, this is simply for the purpose of simplifying the description and is not intended to exclude their application to Embodiments 2 to 7.

[0172] In one modified example, the frequency band for wireless communication using the first radiating electrode 3 or the second radiating electrode 4 is not particularly limited. For example, the frequency band may be selected from well-known frequency bands such as the frequency band for UWB wireless communication, the frequency band for Bluetooth®, the frequency band for Wi-Fi wireless communication, the mid-band of the 2G (second-generation mobile communication) standard, the low-band of the 4G (fourth-generation mobile communication) standard, and the low-band of the 5G (fifth-generation mobile communication) standard. The 2G standard is, for example, the GSM® standard (Global System for Mobile Communications). The 4G standard is, for example, the 3GPP® LTE standard (LTE: Long Term Evolution). The 5G standard is, for example, 5G NR (New Radio). The frequency band may be selected from frequency bands used for various communication standards such as wireless LAN, low-power wireless communication, and short-range wireless communication.

[0173] In one modified example, the shape and dimensions of the first radiating electrode 3, the second radiating electrode 4, and the grounding portion 5, in particular the shape and dimensions of the first grounding electrode 51, the connecting line 52, the stub 53, and the second grounding electrode 54 of the grounding portion 5, may be changed as appropriate. For example, the first radiating electrode 3, the second radiating electrode 4, the first grounding electrode 51, the connecting line 52, and the second grounding electrode 54 do not necessarily have to be symmetrical. The arrangement of the stub 53 with respect to the connecting line 52 may also be changed as appropriate.

[0174] In one modified example, the number of stubs 53 is not particularly limited. The grounding portion 5 only needs to have one or more stubs 53. The grounding portion 5 may have multiple types of stubs 53 with different configurations. For example, the grounding portion 5 may have two or more types of stubs 53, 53A, 53B, 53C, 53D, and 53E described in the above embodiments. As an example, the grounding portion 5 of Embodiment 1 may have a stub 53E of Embodiment 6 in addition to the stub 53.

[0175] In one modified example, the configuration 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 have a well-known configuration such as a double-sided copper-clad laminate or a multilayer substrate. As an example, in Embodiment 1, the substrate 2 comprises a plurality of dielectric layers, and the first radiating electrode 3, the second radiating electrode 4, and the ground portion 5 may be located on different dielectric layers. In addition to the dielectric layers, the substrate 2 may include a protective layer or the like to protect the first radiating electrode 3, the second radiating electrode 4, or the ground portion 5.

[0176] In one modified example, the stub 53 may include one or more conductive paths 531a, 531b formed on the substrate 2, and one or more chip components 532 mounted on the substrate 2. The number of conductive paths 531a, 531b in the stub 53 is not particularly limited. The number of chip components 532 in the stub 53 is not particularly limited. The chip components 532 may include at least one of an inductor, a capacitor, or a 0Ω resistor. As in Embodiment 2, the stub 53A may not include chip components 532.

[0177] In one modified example, the stub 53 does not necessarily have to extend in a direction parallel to the first direction Z, the second direction X, or the third direction Y. The stub 53 may extend in a direction intersecting the first direction Z, the second direction X, or the third direction Y.

[0178] In one modified example, the stub 53D may have a shape that is bent two or more times, and is not limited to a meandering shape. The stub 53D may be, for example, U-shaped or spiral.

[0179] In one modified example, the configuration of the first feed point 61 or the second feed points 62, 62F is not particularly limited. For example, the first feed point 61 is configured to be directly connected to the first radiating electrode 3, but it may also be configured to be capacitively coupled to the first radiating electrode 3 to enable indirect power supply. The same applies to the second feed points 62, 62F.

[0180] In one modified example, the antenna module 10 is not limited to a configuration comprising electronic components 11 and 12, but may comprise one or more electronic components. The electronic components are not limited to processing circuits or connectors.

[0181] [3. Appearance] As is clear from the above embodiments and modifications, this disclosure includes the following aspects. In the following, reference numerals are enclosed in parentheses solely to indicate their correspondence with the embodiments. Note that, for the sake of readability, the notation of reference numerals enclosed in parentheses may be omitted after the first occurrence.

[0182] The first embodiment is an antenna substrate (1; 1A~1F) comprising a substrate (2), a planar first radiating electrode (3) disposed on the substrate (2), a second radiating electrode (4; 4F) disposed on the substrate (2) spatially separated from the first radiating 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~5F) disposed on the substrate (2) common to the first radiating electrode (3) and the second radiating electrode (4; 4F), wherein the ground portion (5; 5A~5F) is from the first direction (Z) The present invention includes a ground electrode (51) facing the first radiating electrode (3), a connecting line (52; 52F) located between the first radiating electrode (3) and the second radiating electrode (4; 4F) when viewed from the first direction (Z), and smaller in size than the ground electrode (51) in a third direction (Y) perpendicular to the second direction (X) when viewed from the first direction (Z), and a stub (53; 53A; 53B; 53C; 53D; 53E) connected to one of the first side (52a) and second side (52b) of the connecting line (52; 52F) that face each other in the third direction (Y). This embodiment enables improved isolation characteristics between the first radiating electrode (3) and the second radiating electrode (4; 4F).

[0183] The second embodiment is an antenna substrate (1; 1A~1F) based on the first embodiment. In this embodiment, the connecting lines (52; 52F) are smaller in size than the first radiating electrode (3) in the third direction (Y). This embodiment enables miniaturization of the substrate (2) in the third direction (Y).

[0184] A third embodiment is an antenna substrate (1; 1A to 1F) based on the first or second embodiment. In this embodiment, the grounding portion (5; 5A to 5F) includes a plurality of stubs (53; 53A; 53B; 53C; 53D; 53E). The plurality of stubs (53; 53A; 53B; 53C; 53D; 53E) include one or more first stubs (53-1, 53-2; 53A-1, 53A-2; 53B-1, 53B-2; 53C-1~53C-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 stubs (53-3, 53-4; 53A-3, 53A-4; 53B-3, 53B-4; 53C-4~53C-6; 53D-3, 53D-4; 53E-3, 53E-4) connected to the second side (53b) of the connecting line (52; 52F). This embodiment enables improved electrical symmetry in the antenna substrate (1; 1A to 1F) and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode (3) and the second radiating electrode (4; 4F).

[0185] The fourth embodiment is an antenna substrate (1; 1A~1F) based on the third embodiment. In this embodiment, the number of one or more first stubs (53-1, 53-2; 53A-1, 53A-2; 53B-1, 53B-2; 53C-1~53C-3; 53D-1, 53D-2; 53E-1, 53E-2) is equal to the number of one or more second stubs (53-3, 53-4; 53A-3, 53A-4; 53B-3, 53B-4; 53C-4~53C-6; 53D-3, 53D-4; 53E-3, 53E-4). This embodiment enables improved electrical symmetry in the antenna substrate (1; 1A~1F) and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode (3) and the second radiating electrode (4; 4F).

[0186] The fifth embodiment is an antenna substrate (1;1A~1F) based on the third or fourth embodiment. In this embodiment, the first connection position between the one or more first stubs (53-1, 53-2; 53A-1, 53A-2; 53B-1, 53B-2; 53C-1~53C-3; 53D-1, 53D-2; 53E-1, 53E-2) and the connecting line (52;52F) in the one or more second stubs (53-3, 53-4; 53A-3, 53A-4; 53B-3, 53B-4; 53C-4~53C-6; 53D-3, 53D-4; 53E-3, 53E-4) is different in the second direction (X). This embodiment allows for further improvement of the isolation characteristics between the first radiating electrode (3) and the second radiating electrode (4; 4F).

[0187] The sixth embodiment is an antenna substrate (1; 1A~1E) based on the fifth embodiment. In this embodiment, the first connection position and the second connection position are point-symmetric with respect to the center (C5) of the connection line (52) as viewed from the first direction (Z). This embodiment enables further improvement of the isolation characteristics between the first radiating electrode (3) and the second radiating electrode (4).

[0188] The seventh embodiment is an antenna substrate (1;1B-1F) based on any one of the first to sixth embodiments. In this embodiment, the 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), wherein the one or more chip components (532) include at least one of an inductor, a capacitor, or a 0Ω resistor. This embodiment facilitates setting the resonant frequency of the stub (53;53B;53C;53D;53E).

[0189] The eighth embodiment is an antenna substrate (1;1B~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 lines (52; 52F). This embodiment allows for further simplification of setting the resonant frequencies of the stubs (53; 53B; 53C; 53D; 53E).

[0190] The ninth embodiment is an antenna substrate (1;1A;1C~1F) based on any one of the first to eighth embodiments. In this embodiment, at least a portion (531b;531g) of the stubs (53;53A;53C;53D;53E) is aligned with the second direction (X). This embodiment allows for a reduction in the electrical length of the stubs required to set the resonant frequency of the stubs (53;53B;53C;53D;53E) to a desired resonant frequency.

[0191] The tenth embodiment is an antenna substrate (1;1A~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 radiating electrode (3) and the center (C5) of the connecting line (52;52F) are aligned along the second direction (X). This embodiment enables further improvement of the isolation characteristics between the first radiating electrode (3) and the second radiating electrode (4;4F).

[0192] The eleventh embodiment is an antenna substrate (1;1A~1E) based on the tenth embodiment. In this embodiment, as viewed from the first direction (Z), the connecting line (52;52F) is symmetrical with respect to a line passing through the center (C3) of the first radiating electrode (3) and parallel to the second direction (X). This embodiment enables further improvement of the isolation characteristics between the first radiating electrode (3) and the second radiating electrode (4;4F).

[0193] The 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 radiating electrode (3) and the feed point (61) of the first radiating electrode (3) are aligned along the second direction (X). This embodiment enables miniaturization of the substrate (2) in the third direction (Y).

[0194] The thirteenth embodiment is an antenna substrate (1;1A~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 radiating electrode (4;4F) and the feed point (62;62F) of the second radiating electrode (4;4F) are aligned along the second direction (X). This embodiment enables miniaturization of the substrate (2) in the third direction (Y).

[0195] A fourteenth embodiment is an antenna substrate (1;1A-1F) based on any one of the first to thirteenth embodiments. In this embodiment, the ground portion (5;5A-5F) includes a plurality of stubs (53;53A;53B;53C;53D;53E), two or more of the plurality of stubs (53;53A;53B;53D;53E) are connected to the first side (52a) of the connecting line (52;52F) and are aligned along the second direction (X). This embodiment allows for further improvement of the isolation characteristics between the first radiating electrode (3) and the second radiating electrode (4;4F).

[0196] The fifteenth embodiment is an antenna substrate (1;1A~1F) based on the fourteenth embodiment. In this embodiment, the spacing between the two or more stubs (53;53A;53B;53C;53D;53E) in the second direction (X) is greater than the width of the two or more stubs (53;53A;53B;53C;53D;53E). This embodiment allows for further improvement of the isolation characteristics between the first radiating electrode (3) and the second radiating electrode (4;4F).

[0197] 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 enables an improvement in the isolation characteristics between the first radiating electrode (3) and the second radiating electrode (4; 4F) over a wider frequency band.

[0198] The 17th embodiment is an antenna substrate (1E) based on any one of the first to 16th embodiments. In this embodiment, at least a portion (531f) of the stub (53E) is aligned in a direction intersecting the plane including the second direction (X) and the third direction (Y). This embodiment enables miniaturization of the substrate (2) in the third direction (Y).

[0199] The 18th embodiment is an antenna substrate (1D) based on any one of the 1st to 17th embodiments. In this embodiment, the stub (53D) has a shape that is bent two or more times. This embodiment makes it possible to shorten the maximum length of one side of the area required for the placement of the stub (53D).

[0200] The 19th embodiment is an antenna substrate (1; 1A to 1E) based on any one of the 1st to 18th embodiments. In this embodiment, the second radiating electrode (4) is planar, the grounding electrode (51) is a first grounding electrode (51), the grounding portion (5; 5A to 5E) includes a second grounding electrode (54) facing the second radiating electrode (4) when viewed from the first direction (Z), and the connecting line (52) connects the first grounding electrode (51) and the second grounding electrode (54). This embodiment enables improved electrical symmetry in the antenna substrate (1; 1A to 1E) and contributes to improved isolation characteristics and antenna characteristics between the first radiating electrode (3) and the second radiating electrode (4).

[0201] The 20th embodiment is an antenna substrate (1F) based on any one of the first to 18th embodiments. In this embodiment, the second radiating electrode (4F) is located on the opposite side of the connecting line (52F) from the first radiating electrode (3) so as not to face the ground portion (5F) when viewed from the first direction (Z). This embodiment enables miniaturization of the substrate (2).

[0202] 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 enables miniaturization of the substrate (2).

[0203] 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 positioned in the third direction (Y) between the sides (52a, 52b) of the connecting line (52) to which the stub (53E) is connected and the sides (3a, 3b) of the first radiating electrode (3) on the same side as those sides (52a, 52b). This embodiment enables miniaturization of the substrate (2) in the third direction (Y).

[0204] The 23rd embodiment comprises 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 enables improvement of the isolation characteristics between the first radiating electrode (3) and the second radiating electrode (4; 4F).

[0205] The second to twenty-two aspects are optional elements and not required. [Industrial applicability]

[0206] This disclosure is applicable to antenna substrates and antenna modules comprising antenna substrates. Specifically, this disclosure is applicable to antenna substrates comprising a plurality of radiating electrodes and antenna modules comprising antenna substrates. [Explanation of Symbols]

[0207] 10 Antenna Modules 11,12 Electronic components 1,1A,1B,1C,1D,1E,1F Antenna board 2 circuit boards 3 First radiation electrode 3a First side (side of the first radiating electrode) 3b Second side (side of the first radiating electrode) 4,4F 2nd radiation electrode 5, 5A, 5B, 5C, 5D, 5E, 5F 51 Ground electrode (1st ground electrode) 52, 52F connecting tracks 52a First side (side of the ground electrode) 52b Second side (side of the ground electrode) 53-1, 53-2 Stub (First Stub) 53-3, 53-4 Stub (Second Stub) 53A-1, 53A-2 Stub (First Stub) 53A-3, 53A-4 Stub (Second Stub) 53B-1, 53B-2 Stub (First Stub) 53B-3, 53B-4 Stub (Second Stub) 53C-1, 53C-2, 53C-3 Stub (First Stub) 53C-4, 53C-5, 53C-6 Stub (Second Stub) 53D-1, 53D-2 Stub (First Stub) 53D-3, 53D-4 Stub (Second Stub) 53E-1, 53E-2 Stub (First Stub) 53E-3, 53E-4 Stub (Second Stub) 53F-1, 53F-2 Stub (First Stub) 53F-3, 53F-4 Stub (Second Stub) 531a,531b,531c,531d,531e,531f,531g Conductive path 532 Chip components 54 2nd ground electrode 61 Power supply point 62,62F Power supply point C3 center (center of the first radiating electrode) C4 center (center of the second radiating electrode) C5 Center (Center of the connecting track) Z 1st direction X 2nd direction Y Third direction

Claims

1. circuit board and A planar first radiating electrode is arranged on the substrate, A second radiating electrode is positioned on the substrate, spatially separated from the first radiating electrode in a second direction when viewed from a first direction along the thickness direction of the substrate, A grounding portion common to the first radiating electrode and the second radiating electrode is provided on the substrate, Equipped with, The aforementioned grounding portion is A ground electrode facing the first radiating electrode when viewed from the first direction, A connecting line located between the first radiating electrode and the second radiating electrode when viewed from the first direction, and smaller in size than the grounding electrode in a third direction perpendicular to the second direction when viewed from the first direction, A stub connected to one of the first and second sides of the connecting line that are opposite to each other in the third direction, including, Antenna circuit board.

2. The connecting line is smaller in size than the first radiating electrode in the third direction. The antenna substrate according to claim 1.

3. The grounding portion includes a plurality of stubs, The aforementioned multiple stubs One or more first stubs connected to the first side of the connecting line, One or more second stubs connected to the second side of the connecting line, including, The antenna substrate according to claim 1.

4. The number of first stubs (one or more) and the number of second stubs (one or more) are equal. The antenna substrate according to claim 3.

5. The first connection position between the connecting line and the one or more first stubs and the second connection position between the connecting line and the one or more second stubs are different in the second direction. The antenna substrate according to claim 3.

6. The first connection position and the second connection position are point-symmetric with respect to the center of the connecting line as viewed from the first direction. The antenna substrate according to claim 5.

7. The aforementioned stub, One or more conductive paths formed on the substrate, One or more chip components mounted on the aforementioned substrate, Includes, The one or more chip components include at least one of an inductor, a capacitor, or a 0Ω resistor. The antenna substrate according to claim 1.

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

9. At least a portion of the stub is aligned with the second direction. The antenna substrate according to claim 1.

10. Viewed from the first direction, the center of the first radiating electrode and the center of the connecting line are aligned along the second direction. The antenna substrate according to claim 1.

11. Viewed from the first direction, the center of the first radiating electrode and the power supply point of the first radiating electrode are aligned along the second direction. The antenna substrate according to claim 1.

12. Viewed from the first direction, the center of the second radiating electrode and the power supply point of the second radiating electrode are aligned along the second direction. The antenna substrate according to claim 11.

13. The grounding portion includes a plurality of stubs, Two or more of the plurality of stubs are connected to the first side of the connecting line and are aligned along the second direction. The antenna substrate according to claim 1.

14. The spacing between the two or more stubs in the second direction is greater than the width of the two or more stubs. The antenna substrate according to claim 13.

15. Two or more of the two or more stubs have different electrical lengths. The antenna substrate according to claim 13.

16. At least a portion of the stub is aligned with a direction intersecting the plane including the second and third directions. The antenna substrate according to claim 1.

17. The second radiating electrode is planar, The recommended grounding electrode is the first grounding electrode, The grounding portion includes a second grounding electrode that faces the second radiating electrode when viewed from the first direction, The aforementioned connecting line connects the first ground electrode and the second ground electrode. The antenna substrate according to claim 1.

18. The second radiating electrode is positioned on the opposite side of the connecting line from the first radiating electrode, so as viewed from the first direction, it does not face the ground portion. The antenna substrate according to claim 1.

19. The stub is positioned in the third direction between the edge of the connecting line to which the stub is connected and the edge of the first radiating electrode on the same side as that edge. The antenna substrate according to claim 1.

20. An antenna substrate according to any one of claims 1 to 19, Electronic components mounted on the aforementioned antenna substrate, Equipped with, Antenna module.

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