Antenna Module

Abstract

To provide an antenna module that can secure high gain and wide bandwidth.SOLUTION: An antenna module includes a ground pattern G3, a radiation electrode 80 arranged on the ground pattern G3, a feeding electrode 70 arranged between the ground pattern G3 and the radiation electrode 80, and a ground conductor P surrounding the radiation electrode 80 and the feeding electrode 70 in plan view, and the planar size of the radiation electrode 80 is smaller than the planar size of the feeding electrode 70.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present disclosure relates to an antenna module. [Background technology]

[0002] Patent Document 1 discloses an antenna module having a structure in which a radiation electrode is surrounded by a plurality of columnar conductors. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. WO2020 / 066604 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the antenna module described in Patent Document 1 feeds power directly to the radiation electrode via a power feed line, making it difficult to adjust the characteristics. Also, a non-powered radiation electrode has a problem in that the coupling with the columnar conductor becomes too strong.

[0005] SUMMARY OF THE DISCLOSURE It is therefore an object of the present disclosure to provide an improved antenna module. [Means for solving the problem]

[0006] An antenna module according to one embodiment of the present disclosure comprises a ground pattern, a radiating electrode arranged on the ground pattern, a feeding electrode arranged between the ground pattern and the radiating electrode, and a ground conductor surrounding the radiating electrode and the feeding electrode in a planar view, and the planar size of the radiating electrode is smaller than the planar size of the feeding electrode. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide an improved antenna module.

Brief Description of the Drawings

[0008] [Figure 1] FIG. 1 is a schematic perspective view showing the appearance of the antenna module 1 according to the first embodiment of the present disclosure. [Diagram 2] FIG. 2 is a schematic plan view showing the pattern shape of the conductor pattern included in the antenna module 1. [Diagram 3] FIG. 3 is a schematic plan view showing the pattern shape of the conductor pattern included in the antenna module 1. [Figure 4] FIG. 4 is a schematic plan view showing the pattern shape of the conductor pattern included in the antenna module 1. [Diagram 5] FIG. 5 is a schematic plan view showing the pattern shape of the conductor pattern included in the antenna module 1. [Figure 6] FIG. 6 is a schematic plan view showing the pattern shape of the conductor pattern included in the antenna module 1. [Figure 7] FIG. 7 is a schematic plan view showing the pattern shape of the conductor pattern included in the antenna module 1. [Figure 8] FIG. 8 is a schematic plan view showing the pattern shape of the conductor pattern included in the antenna module 1. [Figure 9] FIG. 9 is a schematic plan view showing the pattern shape of the conductor pattern included in the antenna module 1. [Figure 10] FIG. 10 is a schematic diagram for explaining the positional relationship between the power supply electrode 70, the radiation electrode 80, and the ground conductor P, where (a) is a schematic plan view and (b) is a schematic side view. [Figure 11] FIG. 11 is a graph showing the return loss characteristics of the antenna module 1, where (a) shows the characteristics when W1>W2 and W3>H1, (b) shows the characteristics when W1 = W2 and W3>H1, and (c) shows the characteristics when W1>W2 and W3<H1. [Figure 12] FIG. 12 is a schematic perspective view showing the appearance of the antenna module 2 according to the second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0010] FIG. 1 is a schematic perspective view showing the appearance of an antenna module 1 according to a first embodiment of the present disclosure.

[0011] As shown in FIG. 1, the antenna module 1 according to the first embodiment includes a flat-plate-shaped element body 3 with the xy direction as the plane direction and the z direction as the thickness direction, and a plurality of conductor patterns including a power supply electrode 70, a radiation electrode 80, and a pillar-shaped ground conductor P embedded in the element body 3. The element body 3 has a multi-layer structure, and a ceramic material such as LTCC (Low Temperature Co-fired Ceramics) or a resin material can be used as the material. The ground conductor P is a conductor pattern to which a ground potential is applied, and is provided so as to surround the power supply electrode 70 and the radiation electrode 80 in a plan view seen from the z direction. In the example shown in FIG. 1, the ground conductor P is composed of a plurality of pillar-shaped conductors, but the power supply electrode 70 and the radiation electrode 80 may be surrounded by a wall-shaped conductor having an xz plane or a yz plane. In addition, as described later, the plurality of pillar-shaped conductors may be short-circuited by a rectangular ring-shaped pattern.

[0012] 2 to 9 are schematic plan views showing the pattern shapes of the conductor patterns included in the antenna module 1. FIG.

[0013] The conductor pattern shown in FIG. 2 is a conductor pattern of the conductor layer located at the bottom layer. The conductor layer located at the bottom layer is provided with a plurality of ground pads 10, a first signal pad 11, and a second signal pad 12. The first signal pad 11 is, for example, a terminal for transmitting and receiving a vertically polarized signal, and the second signal pad 12 is, for example, a terminal for transmitting and receiving a horizontally polarized signal. Solder balls may be mounted on each of the plurality of ground pads 10, the first signal pad 11, and the second signal pad 12. In the example shown in FIG. 2, 7×7 pads are arranged in an array in the x direction and the y direction, one of which is the first signal pad 11, another is the second signal pad 12, and the remaining 47 pads are ground pads 10. Some of the ground pads 10 may be omitted. The positions of the first signal pad 11 and the second signal pad 12 are not particularly limited, but it is preferable to use pads that are not located on the periphery, and it is preferable that the first signal pad 11 and the second signal pad 12 are located symmetrically with respect to a diagonal line extending in the A direction. Through-hole conductors 10a, 11a, and 12a extending in the z-direction are connected to the ground pad 10, the first signal pad 11, and the second signal pad 12, respectively.

[0014] The conductor pattern shown in Fig. 3 is a conductor pattern located in an upper layer of the conductor pattern shown in Fig. 2, and has a ground pattern G1 formed over almost the entire surface of the xy plane. The ground pattern G1 is commonly connected to a plurality of ground pads 10 via the through-hole conductor 10a shown in Fig. 2. As shown in Fig. 3, the ground pattern G1 has openings 11b and 12b, and the through-hole conductors 11a and 12a pass through the openings 11b and 12b, respectively, and are connected to the conductor pattern in the upper layer. The ground pattern G1 is also connected to the ground pattern in the upper layer via a plurality of through-hole conductors P1.

[0015] The conductor pattern shown in Fig. 4 is a conductor pattern located in an upper layer of the conductor pattern shown in Fig. 3, and includes a ground pattern 30 arranged on a diagonal line extending in the A direction, a first 1 / 2 wavelength filter F1, and a second 1 / 2 wavelength filter F2. The ground pattern 30 is connected to the ground pattern G1 via the through-hole conductor P1 shown in Fig. 3. The ground pattern 30 is connected to the upper ground pattern via a plurality of through-hole conductors P2. The first and second 1 / 2 wavelength filters F1 and F2 are bandpass filters having a so-called π-type structure.

[0016] The first 1 / 2 wavelength filter F1 includes first to fourth resonant patterns 31 to 34 which are conductor patterns. As shown in Fig. 4, the second and third resonant patterns 32, 33 are arranged in a row so as to extend in the A direction along the ground pattern 30, i.e., along a diagonal line. The first and fourth resonant patterns 31, 34 extend in the B direction relative to the second and third resonant patterns 32, 33, respectively. The B direction is the extension direction of another diagonal line and is perpendicular to the A direction.

[0017] The first resonant pattern 31 overlaps a part of the first wiring 21. The first wiring 21 is connected to the first signal pad 11 via the through-hole conductor 11a. As a result, the first resonant pattern 31 is connected to the first signal pad 11 via the capacitive coupling with the first wiring 21. The first resonant pattern 31 and the second resonant pattern 32 are capacitively coupled via the coupling pattern 41. The second resonant pattern 32 and the third resonant pattern 33 are capacitively coupled via the coupling pattern 42. The third resonant pattern 33 and the fourth resonant pattern 34 are capacitively coupled via the coupling pattern 43. The fourth resonant pattern 34 overlaps a part of the second wiring 22. The second wiring 22 is connected to the conductor pattern in the upper layer via the first through-hole conductor 51. The coupling patterns 41 to 43 are each a conductor pattern.

[0018] The first wiring 21 is a conductor pattern extending substantially along the direction A. One end of the first wiring 21 is connected to the through-hole conductor 11a, and the other end overlaps with the first resonant pattern 31. This allows the through-hole conductor 11a to be provided at a different planar position from the first resonant pattern 31. In other words, the opening 11b through which the through-hole conductor 11a penetrates is provided at a position that does not overlap with the first resonant pattern 31 in a planar view.

[0019] The second wiring 22 is a conductor pattern extending substantially along the direction A. One end of the second wiring 22 overlaps with the fourth resonant pattern 34, and the other end is connected to the first through-hole conductor 51. As a result, the first through-hole conductor 51 is provided at a different planar position from the fourth resonant pattern 34.

[0020] The first to fourth resonant patterns 31 to 34 each constitute a resonator. The first to fourth resonant patterns 31 to 34 are open-ended resonators with both ends open. The length of the second resonant pattern 32 and the third resonant pattern 33 is set to about 1 / 2 the wavelength of the passband frequency of the first 1 / 2 wavelength filter F1. The first and fourth resonant patterns 31 and 34 have a narrower pattern width in the A direction at the center portion located between both ends than at both ends in the B direction. In this embodiment, the center portion of the first resonant pattern 31 is provided at a position offset toward the fourth resonant pattern 34 in the A direction from both ends, and the edges of both ends and the center portion of the first resonant pattern 31 on the fourth resonant pattern 34 side in the A direction are aligned. In addition, the center portion of the fourth resonant pattern 34 is provided at a position offset toward the first resonant pattern 31 in the A direction from both ends, and the edges of both ends and the center portion of the fourth resonant pattern 34 on the first resonant pattern 31 side in the A direction are aligned.

[0021] The second 1 / 2 wavelength filter F2 has a line-symmetrical structure with the first 1 / 2 wavelength filter F1 with respect to the ground pattern 30. The second 1 / 2 wavelength filter F2 includes fifth to eighth resonant patterns 35 to 38, which are conductor patterns. As shown in FIG. 4, the sixth and seventh resonant patterns 36, 37 are arranged in a line extending in the A direction along the ground pattern 30, that is, along the diagonal line. Here, the sixth resonant pattern 36 is arranged to face the second resonant pattern 32 in the B direction, and the seventh resonant pattern 37 is arranged to face the third resonant pattern 33 in the B direction. The fifth and eighth resonant patterns 35, 38 extend in the B direction with respect to the sixth and seventh resonant patterns 36, 37, respectively.

[0022] The fifth resonant pattern 35 overlaps with a part of the fourth wiring 24. The fourth wiring 24 is connected to the second signal pad 12 via the through-hole conductor 12a. As a result, the fifth resonant pattern 35 is connected to the second signal pad 12 via the capacitive coupling with the fourth wiring 24. The fifth resonant pattern 35 and the sixth resonant pattern 36 are capacitively coupled with each other via the coupling pattern 44. Moreover, the sixth resonant pattern 36 and the seventh resonant pattern 37 are capacitively coupled with each other via the coupling pattern 45. Furthermore, the seventh resonant pattern 37 and the eighth resonant pattern 38 are capacitively coupled with each other via the coupling pattern 46. The eighth resonant pattern 38 overlaps with a part of the fifth wiring 25. The fifth wiring 25 is connected to the conductor pattern in the upper layer via the second through-hole conductor 52. The coupling patterns 44 to 46 are each a conductor pattern.

[0023] The fourth wiring 24 is a conductor pattern extending substantially along the direction A. One end of the fourth wiring 24 is connected to the through-hole conductor 12a, and the other end overlaps with the fifth resonant pattern 35. This allows the through-hole conductor 12a to be provided at a different planar position from the fifth resonant pattern 35. In other words, the opening 12b through which the through-hole conductor 12a penetrates is provided at a position that does not overlap with the fifth resonant pattern 35 in a planar view.

[0024] The fifth wiring 25 is a conductor pattern extending substantially along the direction A. One end of the fifth wiring 25 overlaps with the eighth resonant pattern 38, and the other end is connected to the second through-hole conductor 52. As a result, the second through-hole conductor 52 is provided at a different planar position from the eighth resonant pattern 38.

[0025] The fifth to eighth resonant patterns 35 to 38 each constitute a resonator. The fifth to eighth resonant patterns 35 to 38 are open-ended resonators with both ends open. The lengths of the sixth resonant pattern 36 and the seventh resonant pattern 37 are set to about 1 / 2 the wavelength of the passband frequency of the second 1 / 2 wavelength filter F2. The fifth and eighth resonant patterns 35 and 38 have a narrower pattern width in the A direction at the center between both ends than at both ends in the B direction. In this embodiment, the center of the fifth resonant pattern 35 is provided at a position offset toward the eighth resonant pattern 38 in the A direction from both ends, and the edges of both ends and the center of the fifth resonant pattern 35 on the 8th resonant pattern 38 side in the A direction are aligned. In addition, the center of the eighth resonant pattern 38 is provided at a position offset toward the fifth resonant pattern 35 in the A direction from both ends, and the edges of both ends and the center of the eighth resonant pattern 38 on the 5th resonant pattern 35 side in the A direction are aligned.

[0026] Here, the overlapping area between the fourth resonant pattern 34 and the second wiring 22 and the overlapping area between the eighth resonant pattern 38 and the fifth wiring 25 are larger than the overlapping area between the first resonant pattern 31 and the first wiring 21 and the overlapping area between the fifth resonant pattern 35 and the fourth wiring 24. This makes it easier to ensure impedance matching, thereby expanding the band in which good return loss can be obtained.

[0027] The conductor pattern shown in FIG. 5 is a conductor pattern located in an upper layer of the conductor pattern shown in FIG. 4, and has a ground pattern G2 formed on almost the entire surface of the xy plane. The ground pattern G2 is connected to the ground patterns G1 and 30 via the through-hole conductors P1 and P2 shown in FIG. 3 and FIG. 4. As shown in FIG. 5, the ground pattern G2 has first and second openings 51a and 52a, and the first and second through-hole conductors 51 and 52 pass through the first and second openings 51a and 52a, respectively, and are connected to one end of the third wiring 23 and the sixth wiring 26 located in the upper layer of the ground pattern G2, respectively. Since the first through-hole conductor 51 is connected to the other end of the second wiring 22, the first opening 51a through which the first through-hole conductor 51 penetrates is provided at a position that does not overlap with the fourth resonance pattern 34 in a plan view. Since the second through-hole conductor 52 is connected to the other end of the fifth wiring 25, the second opening 52a through which the second through-hole conductor 52 penetrates is provided at a position that does not overlap with the eighth resonance pattern 38 in a plan view. The pattern width of the third and sixth wirings 23, 26 is designed to be narrower than the pattern width of the second and fifth wirings 22, 25. This makes it easier to ensure impedance matching, thereby expanding the band in which good return loss can be obtained. In addition, the ground pattern G2 is connected to the ground pattern on the upper layer via multiple through-hole conductors P3.

[0028] The third wiring 23 is a conductor pattern extending along the y direction. One end of the third wiring 23 is connected to the first through-hole conductor 51, and the other end is connected to the through-hole conductor 53. As a result, the first through-hole conductor 51 and the through-hole conductor 53 are provided at different planar positions.

[0029] The sixth wiring 26 is a conductor pattern extending along the x direction. One end of the sixth wiring 26 is connected to the second through-hole conductor 52, and the other end is connected to the through-hole conductor 54. This allows the second through-hole conductor 52 and the through-hole conductor 54 to be provided at different planar positions.

[0030] The conductor pattern shown in FIG. 6 is a conductor pattern located in an upper layer of the conductor pattern shown in FIG. 5, and has a ground pattern G3 formed on almost the entire surface of the xy plane. The ground pattern G3 is connected to the ground pattern G2 via the through-hole conductor P3 shown in FIG. 5. As shown in FIG. 6, the ground pattern G3 is provided with openings 53a and 54a. Through-hole conductors 53 and 54 connected to the other ends of the third wiring 23 and the sixth wiring 26, respectively, pass through the openings 53a and 54a. Since the through-hole conductor 53 is connected to the other end of the third wiring 23, the opening 53a through which the through-hole conductor 53 penetrates is provided at a position that does not overlap with the first opening 51a in a plan view. Since the through-hole conductor 54 is connected to the other end of the sixth wiring 26, the opening 54a through which the through-hole conductor 54 penetrates is provided at a position that does not overlap with the second opening 52a in a plan view. The ground pattern G3 is also connected to the ground pattern in the upper layer via a plurality of through-hole conductors P4. The through-hole conductor P4 is a part of the ground conductor P shown in FIG.

[0031] The conductor pattern shown in Fig. 7 is a conductor pattern located in an upper layer of the conductor pattern shown in Fig. 6, and has first and second capacitive coupling electrodes 61, 62. The first and second capacitive coupling electrodes 61, 62 are connected to through-hole conductors 53, 54, respectively.

[0032] The conductor pattern shown in FIG. 8 is a conductor pattern located in an upper layer of the conductor pattern shown in FIG. 7, and includes a power supply electrode 70 and a ground pattern 71. The power supply electrode 70 is cross-shaped, with one end in the y direction overlapping with the first capacitive coupling electrode 61 and one end in the x direction overlapping with the second capacitive coupling electrode 62. This allows the power supply electrode 70 to be capacitively coupled to the first and second capacitive coupling electrodes 61, 62. The ground pattern 71 is a rectangular ring-shaped pattern arranged along the outer periphery, and is connected to the ground pattern G3 via the through-hole conductor P4 shown in FIGS. 6 and 7. The ground pattern 71 is also connected to the ground pattern in the upper layer via a plurality of through-hole conductors P5. The ground pattern 71 and the through-hole conductors P5 are another part of the ground conductor P shown in FIG. 1.

[0033] The conductor pattern shown in FIG. 9 is a conductor pattern located on the upper layer of the conductor pattern shown in FIG. 8, and has a radiation electrode 80 and a ground pattern 81. The ground pattern 81 is yet another part of the ground conductor P shown in FIG. 1, and constitutes the upper end of the ground conductor P. In this way, the radiation electrode 80 and the ground pattern 81 are formed on the same conductor layer, and therefore both are located on the same plane. That is, the surface of the radiation electrode 80 opposite to the surface on the power feeding electrode 70 side and the end surface of the ground conductor P opposite to the end surface on the ground pattern G3 side are located on the same plane. However, the upper ends of the radiation electrode 80 and the ground conductor P do not need to be completely on the same plane, and there may be a difference of about the thickness of one conductor layer. The radiation electrode 80 is a patch conductor with a substantially rectangular shape, and overlaps with the power feeding electrode 70. As a result, the radiation electrode 80 and the power feeding electrode 70 are capacitively coupled, and the power feeding electrode 70 and the radiation electrode 80 resonate in the frequency band of the electromagnetic wave radiated from the radiation electrode 80. The ground pattern 81 is a rectangular ring-shaped pattern arranged along the outer periphery, and is connected to the ground pattern 71 via a through-hole conductor P5 shown in Fig. 8. The shape of the radiation electrode 80 is not limited to this, and may be a patch conductor that is substantially circular, substantially elliptical, or substantially polygonal other than rectangular.

[0034] With the above configuration, a first 1 / 2 wavelength filter F1 is inserted between the first signal pad 11 and the radiation electrode 80, and a second 1 / 2 wavelength filter F2 is inserted between the second signal pad 12 and the radiation electrode 80. As a result, a vertically polarized signal supplied to the first signal pad 11 and a horizontally polarized signal supplied to the second signal pad 12 are fed to the radiation electrode 80 via the first and second 1 / 2 wavelength filters F1 and F2, respectively, thereby achieving dual polarization.

[0035] 10 is a schematic diagram for explaining the positional relationship between the power supply electrode 70, the radiation electrode 80, and the ground conductor P, where (a) is a schematic plan view and (b) is a schematic side view. For convenience, in FIG. 10, the ground conductor P is depicted as a wall-shaped conductor.

[0036] As shown in FIG. 10, the ground conductor P has a portion extending in the x direction and a portion extending in the y direction. Therefore, the region surrounded by the ground conductor P is rectangular in plan view. The power supply electrode 70 and the radiation electrode 80 are disposed at the center of the rectangular region surrounded by the ground conductor P in plan view. The power supply electrode 70 having a cross shape has a portion extending in the x direction and a portion extending in the y direction. Each side of the rectangular radiation electrode 80 extends in the x direction or the y direction. In the present embodiment, since the planar shape of the radiation electrode 80 is substantially square and the region surrounded by the ground conductor P in plan view is substantially square, the distance between each side of the radiation electrode 80 and the ground conductor P in the planar direction (x direction or y direction) is constant. That is, the distance in the y direction between the side of the radiation electrode 80 extending in the x direction and the portion of the ground conductor P extending in the x direction is constant, and the distance in the x direction between the side of the radiation electrode 80 extending in the y direction and the portion of the ground conductor P extending in the y direction is constant.

[0037] Thus, since the radiation electrode 80 is surrounded by the ground conductor P in plan view, the radiation electrode 80 resonates not only with the ground pattern G3 but also with the ground conductor P. For this reason, the bandwidth is further expanded as compared with the case where the ground conductor P does not exist. Here, when the length of one side of the radiation electrode 80, that is, the planar size of the radiation electrode 80 is W1, and the length of the power supply electrode 70 in the x direction or the y direction, that is, the planar size of the power supply electrode 70 is W2, in the present embodiment, W1 < W2 is satisfied. For this reason, the distance W3 in the planar direction between the radiation electrode 80 and the ground conductor P is larger than the distance W4 in the planar direction between the power supply electrode 70 and the ground conductor P. As a result, a part of the power supply electrode 70 protrudes in the x direction or the y direction from the radiation electrode 80 in plan view. Therefore, when the radiation electrode 80 resonates with the ground conductor P, it is possible to suppress a significant decrease in the resonance frequency due to the inductance component of the ground conductor P and to resonate at a desired frequency. The protrusion amount W5 in the planar direction of the power supply electrode 70 with respect to the radiation electrode 80 is smaller than the distance W4 in the planar direction between the power supply electrode 70 and the ground conductor P.

[0038] Also, when the distance in the thickness direction (z - direction) between the ground pattern G3 and the radiating electrode 80 is H1, and the distance in the thickness direction (z - direction) between the ground pattern G3 and the feeding electrode 70 is H2, the distance H1 is about three times the distance H2, and the feeding electrode 70 is arranged offset toward the ground pattern G3 side. For this reason, the distance H2 in the thickness direction (z - direction) between the ground pattern G3 and the feeding electrode 70 is smaller than the distance H3 in the thickness direction (z - direction) between the feeding electrode 70 and the radiating electrode 80. Also, the distance H4 in the thickness direction (z - direction) between the capacitive coupling electrodes 61, 62 arranged between the ground pattern G3 and the feeding electrode 70 and the feeding electrode 70 is smaller than the distance H3 in the thickness direction (z - direction) between the feeding electrode 70 and the radiating electrode 80, whereby the capacitive coupling electrodes 61, 62 and the feeding electrode 70 are strongly coupled.

[0039] Thus, in this embodiment, since the radiating electrode 80 resonates between the ground pattern G3 and the ground conductor P, the planar size of the radiating electrode 80 becomes smaller compared to the case where the ground conductor P does not exist. For this reason, compared to the case where the ground conductor P does not exist, the bandwidth is further expanded, and the inductance component of the ground conductor P suppresses a significant decrease in the resonance frequency, enabling resonance at a desired frequency. Also, in this embodiment, the length W1 of one side of the radiating electrode 80 is less than 1 / 2 of the wavelength of the electromagnetic wave radiated from the radiating electrode 80. Further, in this embodiment, while W1 < W2 is satisfied, the distance W3 in the planar direction between the radiating electrode 80 and the ground conductor P is equal to or greater than the distance H1 in the thickness direction (z - direction) between the radiating electrode 80 and the ground pattern G3, and since the upper ends of the radiating electrode 80 and the ground conductor P are located substantially in the same plane, the coupling between the radiating electrode 80 and the ground conductor P does not become excessive. Thereby, since the coupling between the radiating electrode 80 and the ground pattern G3 becomes dominant, stable antenna characteristics can be ensured.

[0040] On the other hand, regarding the power supply electrode 70 disposed between the ground pattern G3 and the radiation electrode 80, since it has a larger planar size than the radiation electrode 80, sufficient coupling with the radiation electrode 80 can be ensured. Further, the distance H3 in the thickness direction (z direction) between the power supply electrode 70 and the radiation electrode 80 is smaller than the distance W4 in the planar direction between the power supply electrode 70 and the ground conductor P, and the protrusion amount W5 in the planar direction of the power supply electrode 70 with respect to the radiation electrode 80 is smaller than the distance W4 in the planar direction between the power supply electrode 70 and the ground conductor P. Therefore, the coupling between the power supply electrode 70 and the ground conductor P is relatively small. For this reason, the planar size W2 of the power supply electrode 70 is less than half of the wavelength of the electromagnetic wave radiated from the radiation electrode 80.

[0041] Thus, since the antenna module 1 according to this embodiment has the above-described positional relationship among the power supply electrode 70, the radiation electrode 80, and the ground conductor P, it is possible to ensure high gain and wide bandwidth.

[0042] FIG. 11 is a graph showing the return loss characteristics of the antenna module 1. (a) shows the characteristics when W1 > W2 and W3 > H1, (b) shows the characteristics when W1 = W2 and W3 > H1, and (c) shows the characteristics when W1 > W2 and W3 < H1.

[0043] As shown in FIG. 11(a), when W1 > W2 and W3 > H1, it can be seen that a wide bandwidth is ensured centered around approximately 28.5 GHz. On the other hand, as shown in FIG. 11(b), when W1 = W2, the coupling between the radiation electrode 80 and the ground conductor P becomes too strong, and the resonance points in the 26 - 30 GHz band disappear. Further, as shown in FIG. 11(c), when W3 < H1, although some radiation characteristics are obtained in the 26 - 30 GHz band, it can be seen that the return loss characteristics are lower than when W3 > H1.

[0044] FIG. 12 is a schematic perspective view showing the appearance of the antenna module 2 according to the second embodiment of the present disclosure.

[0045] 12, the antenna module 2 according to the second embodiment has a structure in which four elements having substantially the same structure as the conductor pattern included in the antenna module 1 are laid out in an array in the x and y directions. However, the four elements included in the antenna module 2 do not need to have completely the same structure as the antenna module 1, and some may be different. In this way, by laying out a plurality of elements having substantially the same structure as the antenna module 1 in an array, it becomes possible to control the radiation direction of the beam by phase control.

[0046] Although the above describes preferred embodiments of the present disclosure, the present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present disclosure, and it goes without saying that these modifications are also included within the scope of the present disclosure.

[0047] The technology according to the present disclosure includes the following configuration examples, but is not limited to these.

[0048] The antenna module according to the present disclosure includes a ground pattern, a radiation electrode disposed on the ground pattern, a power feeding electrode disposed between the ground pattern and the radiation electrode, and a ground conductor surrounding the radiation electrode and the power feeding electrode in a planar view, and the planar size of the radiation electrode is smaller than the planar size of the power feeding electrode. This expands the bandwidth compared to a case where the ground conductor is not present, and prevents the resonant frequency from being significantly lowered due to the inductance component of the ground conductor, thereby enabling resonance at a desired frequency.

[0049] The distance between the radiation electrode and the ground conductor in the planar direction may be constant, which makes it possible to obtain the same radiation pattern in both the x and y directions because the coupling between the radiation electrode and the ground conductor is the same in both the x and y directions.

[0050] The planar size of the radiation electrode may be less than half the wavelength of the electromagnetic wave radiated from the radiation electrode. In this way, the planar size of the radiation electrode can be adjusted by the degree of coupling between the radiation electrode and the ground conductor.

[0051] The power supply electrode may have a cross shape, which makes it possible to suppress coupling between the power supply electrode and the ground conductor and achieve dual polarization.

[0052] The surface of the radiation electrode opposite to the surface facing the power supply electrode and the end surface of the ground conductor opposite to the end surface facing the ground pattern may be positioned on substantially the same plane, thereby preventing excessive coupling between the radiation electrode and the ground conductor.

[0053] The distance between the power supply electrode and the radiation electrode in the thickness direction may be smaller than the distance between the power supply electrode and the ground conductor in the planar direction, thereby ensuring sufficient coupling between the power supply electrode and the radiation electrode.

[0054] The antenna module according to the present disclosure further includes a capacitive coupling electrode disposed between the ground pattern and the feeding electrode and capacitively coupled to the feeding electrode, and the distance between the capacitive coupling electrode and the feeding electrode in the thickness direction may be smaller than the distance between the feeding electrode and the radiation electrode in the thickness direction, thereby making it possible to sufficiently ensure coupling between the capacitive coupling electrode and the feeding electrode.

[0055] The amount by which the power supply electrode protrudes from the radiation electrode in a planar direction may be smaller than the distance between the power supply electrode and the ground conductor in a planar direction, thereby making it possible to suppress coupling between the power supply electrode and the ground conductor.

[0056] The distance between the radiation electrode and the ground conductor in the planar direction may be equal to or greater than the distance between the radiation electrode and the ground pattern in the thickness direction, thereby preventing excessive coupling between the radiation electrode and the ground conductor. [Explanation of symbols]

[0057] 1,2 Antenna module 3 Base 10 Ground Pad 11 1st signal pad 12 2nd signal pad 10a, 11a, 12a Through hole conductor 11b,12b opening 21 1st wiring 22 2nd wiring 23 3rd wiring 24 4th wiring 25 5th wiring 26 6th wiring 30 Grand Pattern 31 First Resonant Pattern 32 Second Resonant Pattern 33 Third Resonance Pattern 34 4th Resonance Pattern 35 5th Resonance Pattern 36 6th Resonance Pattern 37 7th Resonance Pattern 38 8th Resonance Pattern 41~46 Bond Pattern 51 First through-hole conductor 52 Second through hole conductor 53,54 Through hole conductor 53a,54a opening 61 1st capacitive coupling electrode 62 Second capacitive coupling electrode 70 Power supply electrode 71 Grand Pattern 80 radiation electrode 81 Grand Pattern F1 First half-wavelength filter F2 Second half-wavelength filter G1~G3 Ground pattern P1~P5 Through hole conductor

Claims

1. The ground pattern and a radiation electrode disposed on the ground pattern; a feeding electrode disposed between the ground pattern and the radiation electrode; a ground conductor surrounding the radiation electrode and the power supply electrode in a plan view, a planar size of the radiation electrode is smaller than a planar size of the feeding electrode, the distance between the power supply electrode and the radiation electrode in a thickness direction is smaller than the distance between the power supply electrode and the ground conductor in a planar direction.

2. A ground pattern, a radiation electrode disposed on the ground pattern; a feeding electrode disposed between the ground pattern and the radiation electrode; a ground conductor surrounding the radiation electrode and the power supply electrode in a plan view; a capacitive coupling electrode disposed between the ground pattern and the power supply electrode and capacitively coupled to the power supply electrode; a planar size of the radiation electrode is smaller than a planar size of the feeding electrode, the distance between the capacitive coupling electrode and the power supply electrode in the thickness direction is smaller than the distance between the power supply electrode and the radiation electrode in the thickness direction.

3. A ground pattern; a radiation electrode disposed on the ground pattern; a feeding electrode disposed between the ground pattern and the radiation electrode; a ground conductor surrounding the radiation electrode and the power supply electrode in a plan view, a planar size of the radiation electrode is smaller than a planar size of the feeding electrode, an amount of protrusion of the power supply electrode from the radiation electrode in a planar direction is smaller than a distance between the power supply electrode and the ground conductor in the planar direction.

4. A ground pattern; a radiation electrode disposed on the ground pattern; a feeding electrode disposed between the ground pattern and the radiation electrode; a ground conductor surrounding the radiation electrode and the power supply electrode in a plan view, a planar size of the radiation electrode is smaller than a planar size of the feeding electrode, an antenna module, wherein a distance between the radiation electrode and the ground conductor in a planar direction is equal to or greater than a distance between the radiation electrode and the ground pattern in a thickness direction.

5. The antenna module according to claim 1 , wherein a distance between the radiation electrode and the ground conductor in a planar direction is constant.

6. The antenna module according to claim 5 , wherein a planar size of the radiation electrode is less than half the wavelength of an electromagnetic wave radiated from the radiation electrode.

7. The antenna module according to claim 1 , wherein the feeding electrode has a cross shape.

8. 8. The antenna module according to claim 1, wherein a surface of the radiation electrode opposite to a surface on the power supply electrode side and an end surface of the ground conductor opposite to an end surface on the ground pattern side are positioned substantially in the same plane.

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