Antenna

Abstract

An antenna is provided with: a dielectric substrate; a feed conductor part provided on the dielectric substrate; a linear or strip-shaped first conductor part which is provided on the substrate surface of the dielectric substrate, is connected to the feed conductor part, and has an open end at one end; and a linear or belt-shaped second conductor portion having a first end portion and a second end portion on the opposite side of the first end portion, the first end portion being connected to an intermediate portion between both ends of the first conductor portion, the second end portion being an open end, and the second conductor portion protruding from the intermediate portion.

Description

Technical Field

[0001] The present disclosure relates to antennas.

[0002] This application claims the priority based on Japanese application No. 2022-166185 for which it applied on October 17, 2022, and cites all the contents described in the said Japanese application. Background Art

[0003] In recent years, as electronic devices have become smaller in size, antennas mounted on a substrate surface of a dielectric substrate are sometimes used.

[0004] Antennas mounted on the substrate surface include an inverted L-shaped antenna, an inverted F-shaped antenna, a meander line antenna, and the like (see, for example, Patent Document 1).

[0005] The antenna includes a linear or strip-shaped conductor portion that functions as an antenna element. Prior art literature Patent Literature

[0006] Patent document 1: Japanese Patent Application Laid-Open No. 2011-142542. Summary of the invention

[0007] The antenna of the embodiment comprises: a feed conductor portion provided on the dielectric substrate; a linear or strip-shaped first conductor portion provided on the substrate surface of the dielectric substrate, connected to the feed conductor portion, and having one end as an open end; and a linear or strip-shaped second conductor portion having a first end portion and a second end portion on the opposite side of the first end portion. The first end portion is connected to a middle portion between the two ends of the first conductor portion, and the second end portion is an open end. The second conductor portion protrudes from the middle portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a perspective view showing an example of the antenna according to the first embodiment.

[0009] Figure 2 This is an enlarged view of the main part of the first side of the antenna.

[0010] Figure 3 A diagram of the antenna as seen from above and a cross-sectional view of a main part of the antenna are shown.

[0011] Figure 4 It is a perspective view showing an example of the antenna according to the second embodiment.

[0012] Figure 5 It is a side view of the antenna according to the second embodiment and a diagram when the antenna is viewed from above.

[0013] Figure 6It is a perspective view showing an example of the antenna according to the third embodiment.

[0014] Figure 7 It is an enlarged view of the main part of the antenna and a cross-sectional view of the main part of the antenna.

[0015] Figure 8 It is a perspective view of an antenna according to a fourth embodiment.

[0016] Fig. 9 It is an enlarged view of a main part of the first surface of the antenna according to the fifth embodiment.

[0017] Fig.10 It is a cross-sectional view of a main part of the antenna according to the sixth embodiment.

[0018] Fig.11 It is a perspective view of an antenna according to the seventh embodiment.

[0019] Fig.12 It is a diagram showing a modification of the connection form of the first conductor part and the second conductor part.

[0020] Fig.13 It is a perspective view of an antenna according to the eighth embodiment.

[0021] Fig.14 A diagram showing an antenna according to an eighth embodiment as viewed from above and a cross-sectional view of a main portion of the antenna are shown.

[0022] Fig.15 It is a perspective view of the second end portion of the second conductor portion according to a modification of the eighth embodiment.

[0023] Fig.16 It is a cross-sectional view of a main part of an antenna according to another modified example of the eighth embodiment.

[0024] Fig.17 It is a diagram showing a modification of the connection form of the first conductor part and the second conductor part.

[0025] Fig.18 It is a diagram showing another modification of the connection method between the first conductor part and the second conductor part.

[0026] Fig.19 1 is a diagram showing radiation patterns of the vertical polarization component and the horizontal polarization component of Example 1 and Comparative Example 1 on the XY plane.

[0027] Fig. 20 1 is a diagram showing radiation patterns of the vertical polarization component and the horizontal polarization component of Example 1 and Comparative Example 1 on the YZ plane.

[0028] Fig.211 is a diagram showing radiation patterns of the vertical polarization component and the horizontal polarization component of Example 1 and Comparative Example 1 on the XZ plane.

[0029] Fig. 22 It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 2 and Comparative Example 1 on the XY plane.

[0030] Fig.23 The diagrams show radiation patterns of the vertical polarization component and the horizontal polarization component of Example 2 and Comparative Example 1 on the YZ plane.

[0031] Fig.24 It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 2 and Comparative Example 1 on the XZ plane.

[0032] Fig.25 It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 3 and Comparative Example 2 on the XY plane.

[0033] Fig.26 It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 3 and Comparative Example 2 on the YZ plane.

[0034] Fig. 27 The diagrams show radiation patterns of the vertical polarization component and the horizontal polarization component of Example 3 and Comparative Example 2 on the XZ plane.

[0035] Fig.28 It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 4 and Comparative Example 2 on the XY plane.

[0036] Fig.29 It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 4 and Comparative Example 2 on the YZ plane.

[0037] Fig.30 It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 4 and Comparative Example 2 on the XZ plane.

[0038] Fig.31 1 is a diagram showing the relationship between the gain difference Δ of the perpendicular polarization component on the XY plane and the length H of the second conductor portion 14 .

[0039] Fig.32 1 is a diagram showing the relationship between the gain difference Δ of the horizontal polarization component on the XY plane and the length H of the second conductor portion 14 .

[0040] Fig.333 is a diagram showing the relationship between the gain difference Δ of the vertical polarization component on the YZ plane and the length H of the second conductor portion 14 .

[0041] Fig.34 This is a diagram showing an example of a conventional inverted-F antenna.

[0042] Fig.35 The diagram shows radiation patterns of the vertical polarization component and the horizontal polarization component of a conventional inverted-F antenna. DETAILED DESCRIPTION

[0043] Technical problems to be solved by the present disclosure

[0044] Fig.34 FIG. 1 is a diagram showing an example of a conventional inverted F-type antenna. Fig.34 In the diagram, three mutually orthogonal directions are defined as the X direction, the Y direction, and the Z direction. In addition, one of the X directions is defined as the X1 direction, and the direction opposite to the X1 direction is defined as the X2 direction. One of the Y directions is defined as the Y1 direction, and the direction opposite to the Y1 direction is defined as the Y2 direction. One of the Z directions is defined as the Z1 direction, and the direction opposite to the Z1 direction is defined as the Z2 direction.

[0045] exist Fig.34 In FIG. 1 , the inverted-F antenna 100 includes a dielectric substrate 102 , an antenna element 104 , a feed conductor 106 , a short-circuit conductor 108 , a first ground conductor 109 , and a second ground conductor 110 .

[0046] Since the antenna element 104 of the inverted-F antenna 100 is mounted on the substrate surface, the gain of the polarization component orthogonal to the substrate surface may be significantly reduced.

[0047] For example, the dielectric substrate 102 is Fig.34 The radiation patterns of the vertical polarization component and the horizontal polarization component of the inverted F-type antenna 100 when arranged in a manner perpendicular to the XY plane as a horizontal plane are shown in FIG. Fig.35 .

[0048] Fig.35 (a) shows Fig.34 The vertical polarization component (V in the figure) and the horizontal polarization component (H in the figure) on the XY plane. Fig.35 (b) shows Fig.34 The vertical polarization component (V in the figure) and the horizontal polarization component (H in the figure) on the YZ plane. Fig.35 (c) shows Fig.34 The vertical polarization component (V in the figure) and the horizontal polarization component (H in the figure) on the XZ plane.

[0049] exist Fig.35 In (a), "0" indicates the X1 direction and "90" indicates the Y1 direction. Fig.35 In (b), "0" indicates the Z1 direction and "90" indicates the Y1 direction. Fig.35 In (c), “0” indicates the Z1 direction and “90” indicates the X1 direction.

[0050] observe Fig.35 , the horizontal polarization component (H) on the XY plane has a local decrease in the X1 direction and the X2 direction. The vertical polarization component (V) on the YZ plane has a local decrease in the Z1 direction and the Z2 direction.

[0051] In particular, the gain of the horizontal polarization component (H) on the XZ plane becomes extremely low in all directions.

[0052] Thus, in the inverted-F antenna 100 , the gain of the polarization component perpendicular to the substrate surface and the gain of the component perpendicular to the substrate surface among the polarization components are reduced.

[0053] Such a reduction in the gain of the polarization component orthogonal to the substrate surface occurs not only in the inverted-F antenna but also in the inverted-L antenna and meander line antenna mounted on the substrate surface.

[0054] An object of the present disclosure is to provide a technology capable of suppressing a decrease in the gain of a polarization component orthogonal to a substrate surface.

[0055] Effects of the present disclosure

[0056] According to the present disclosure, it is possible to suppress a decrease in the gain of a polarization component orthogonal to a substrate surface. DETAILED DESCRIPTION

[0057] First, the contents of the embodiment will be listed and described.

[0058] Summary of Implementation Methods

[0059] (1) An antenna according to an embodiment includes: a feed conductor portion provided on the dielectric substrate; a linear or strip-shaped first conductor portion provided on a substrate surface of the dielectric substrate, connected to the feed conductor portion, and having one end being an open end; and a linear or strip-shaped second conductor portion having a first end portion and a second end portion opposite to the first end portion. The first end portion is connected to a middle portion between the two ends of the first conductor portion, and the second end portion is an open end. The second conductor portion protrudes from the middle portion.

[0060] According to the above configuration, since the second conductor portion protrudes from the middle portion of the first conductor portion, a polarization component intersecting the substrate surface can be excited by the second conductor portion.

[0061] As a result, it is possible to suppress a decrease in the gain of the polarization component perpendicular to the substrate surface, and to compensate for the polarization component causing the decrease in gain only by the first conductor portion.

[0062] (2) In the antenna of the above (1), preferably, the dielectric substrate has a holding hole into which the first end portion is inserted.

[0063] In this case, it is easy to maintain the second conductor portion in a state of protruding from the intermediate portion.

[0064] (3) Furthermore, in the antenna of (2) above, the intermediate portion may include a through hole into which the first end portion is inserted.

[0065] In this case, even when the second conductor portion is made to protrude from the surface of the first conductor portion opposite to the surface on the dielectric substrate side, the second conductor portion can be held by the holding hole.

[0066] (4) In the antenna of (1) above, preferably, the first end portion includes a plate-shaped base conductor portion along the middle portion.

[0067] In this case, by making the base end conductor portion and the intermediate portion face each other, the first end portion and the intermediate portion can be easily connected.

[0068] (5) In the antenna of the above (4), preferably, it further includes an insulating adhesive layer provided between the base conductor portion and the intermediate portion.

[0069] In this case, the intermediate portion and the second conductor portion can be capacitively coupled and fixed to each other via the insulating adhesive layer.

[0070] (6) In the antenna described in (1) to (5) above, preferably, the second end portion includes a plate-shaped conductor portion along an intersecting plane intersecting with a longitudinal direction of the second conductor portion.

[0071] In this case, a moderate capacitance component can be given to the second end portion, and even if the length of the second conductor portion is further shortened, the gain of the polarization component orthogonal to the substrate surface can be suppressed from decreasing, similar to the case where the second conductor portion does not include the plate-shaped conductor portion. As a result, the antenna can be miniaturized as a whole.

[0072] (7) In the antennas described in (1) to (6) above, preferably, a ratio of a lengthwise dimension of the second conductor portion to a lengthwise dimension of the first conductor portion is greater than or equal to 0.36 and less than or equal to 1.2.

[0073] If the ratio is less than 0.36, the effect of suppressing a decrease in gain of a polarization component perpendicular to the substrate surface may not be sufficiently obtained.

[0074] If the ratio is larger than 1.2, the effect of suppressing the decrease in gain of the polarization component perpendicular to the substrate surface may vary, and a stable effect may not be obtained.

[0075] By setting the ratio to 0.36 or more and 1.2 or less, it is possible to effectively suppress a decrease in the gain of the polarization component perpendicular to the substrate surface.

[0076] (8) In the antennas described in (1) to (7) above, the first conductor portion may constitute an inverted-F antenna element.

[0077] In this case, the antenna can function as an inverted-F antenna.

[0078] (9) In the antennas described in (1) to (8) above, the first conductor portion may constitute an inverted L-shaped antenna element.

[0079] In this case, the antenna can function as an inverted L-shaped antenna.

[0080] (10) In the antennas described in (1) to (9) above, the first conductor portion may have a meander line structure.

[0081] In this case, the antenna can function as a meander line antenna.

[0082] [Details of implementation method]

[0083] Hereinafter, preferred embodiments will be described with reference to the drawings.

[0084] Furthermore, at least a part of each embodiment described below may be arbitrarily combined.

[0085] [About the first embodiment]

[0086] Figure 1 It is a perspective view showing an example of the antenna according to the first embodiment.

[0087] The antenna 1 is, for example, an antenna used for wireless LAN communication. The antenna 1 is an antenna composed of a conductor pattern formed on a substrate of an electronic device having a wireless LAN communication function.

[0088] In the following description, three directions orthogonal to each other are defined as the X direction, the Y direction, and the Z direction in each figure. Figure 1 As shown in the figure, one of the X directions is set as the X1 direction, and the opposite direction of the X1 direction is set as the X2 direction. One of the Y directions is set as the Y1 direction, and the opposite direction of the Y1 direction is set as the Y2 direction. One of the Z directions is set as the Z1 direction, and the opposite direction of the Z1 direction is set as the Z2 direction.

[0089] Figure 2 It is an enlarged view of a main part of the first surface 1a of the antenna 1. The first surface 1a is a surface of the antenna 1 facing the Y1 direction.

[0090] like Figure 1 as well as Figure 2 As shown, the antenna 1 includes a dielectric substrate 2 , a first ground conductor 4 , a second ground conductor 6 , a feed conductor 8 , a first conductor 10 , a short-circuit conductor 12 , and a second conductor 14 .

[0091] In this embodiment, the XY plane is a horizontal plane. In addition, the Z1 direction is the upward direction, and the Z2 direction is the downward direction. Figure 1 As shown, the antenna 1 is disposed so that the first surface 1a is parallel to the XZ plane. That is, the antenna 1 is disposed so that the first surface 1a is perpendicular to the horizontal plane.

[0092] Furthermore, the antenna 1 is arranged so that the first conductor portion 10 is located upward (in the Z1 direction).

[0093] The dielectric substrate 2 is a substrate on which the first conductor 10, the short-circuit conductor 12, etc. are mounted. The dielectric substrate 2 is a rigid substrate, but a flexible substrate may also be used. As the material of the dielectric substrate 2, polyimide resin, epoxy resin, PPE resin, fluororesin, etc. may be cited.

[0094] The first ground conductor 4 is a conductor pattern mounted on the first substrate surface 2a. The conductor pattern is made of a conductor such as copper. The first substrate surface 2a is a surface of the dielectric substrate 2 on the first surface 1a side of the antenna 1.

[0095] The second ground conductor 6 is a conductor pattern mounted on the second substrate surface 2b. The second substrate surface 2b is a surface of the dielectric substrate 2 on the second surface 1b side of the antenna 1. The second surface 1b is a surface of the antenna 1 facing the Y2 direction.

[0096] The first ground conductor 4 and the second ground conductor 6 are mounted in the first surface 1 a and the second surface 1 b except for the rectangular portion along the edge of the dielectric substrate 2 on the Z1 direction side.

[0097] Therefore, the first substrate surface 2a has a first region 2a1 and a second region 2a2. The first region 2a1 is a region covered by the first ground conductor 4. The second region 2a2 is a region other than the first region 2a1 in the first substrate surface 2a.

[0098] The second substrate surface 2b has a third region 2b1 and a fourth region 2b2. The third region 2b1 is a region covered by the second ground conductor 6. The fourth region 2b2 is a region other than the third region 2b1 in the second substrate surface 2b.

[0099] The first conductor portion 10 , the short-circuit conductor portion 12 , and the power supply conductor portion 8 are conductor patterns mounted in the second region 2 a of the first substrate surface 2 a .

[0100] like Figure 2 As shown, the first ground conductor 4 has a slit 4b. The slit 4b extends from the edge 4a of the first ground conductor 4 in the Z2 direction. The edge 4a extends along the X direction. The slit 4b is provided at the center of the edge 4a in the X direction.

[0101] In addition, the slit 4b may be provided at a position offset from the center of the first surface 1a in the X direction.

[0102] The first ground conductor 4 is not provided in the portion of the slit 4b in the first substrate surface 2a. Therefore, the portion of the slit 4b in the first substrate surface 2a is the second region 2a2.

[0103] A plurality of through holes 19 are provided on both sides of the slit 4b in the X direction. The plurality of through holes 19 are columnar members made of a conductor such as copper that penetrate the dielectric substrate 2. One end of each of the plurality of through holes 19 is connected to the second ground conductor 6. The other end of each of the plurality of through holes 19 is connected to the first ground conductor 4. Thus, the plurality of through holes 19 connect the second ground conductor 6 to the first ground conductor 4. The plurality of through holes 19 are arranged side by side along the slit 4b.

[0104] In addition, in the present embodiment, the connection between the through hole 19 and the first grounding conductor 4 means that the through hole 19 and the first grounding conductor 4 are electrically connected. The electrical connection between the through hole 19 and the first grounding conductor 4 includes not only the through hole 19 and the first grounding conductor 4 are directly in contact with each other or are connected via other conductors, but also the case where the through hole 19 and the first grounding conductor 4 are connected at high frequency through mutual capacitive coupling. The same applies to the "connection" between the conductors in the following description.

[0105] The feed conductor portion 8 passes through the slit 4b and is connected to the first conductor portion 10. The feed conductor portion 8 extends along the Z direction.

[0106] The feed conductor portion 8 includes a first feed line 8 a and a second feed line 8 b .

[0107] The first feeder line 8a is a portion provided in the slit 4b of the feeder conductor 8. A small gap is provided between both edges of the first feeder line 8a in the X direction and the end edge of the first ground conductor 4 in the slit 4b.

[0108] The first feeder line 8 a and the first ground conductor portions 4 located on both sides of the first feeder line 8 a constitute a coplanar line.

[0109] The first feeder line 8a has a feed point 8a. The feed point 8a is provided at the end of the first feeder line 8a on the Z2 direction side. A signal source S such as a communication module for wireless LAN communication is connected to the feed point 8a1. The communication module has a function of processing high frequency signals transmitted and received by the antenna 1.

[0110] The second feeder line 8 b is a portion of the feeder conductor portion 8 other than the first feeder line 8 a , and is a portion ranging from the edge portion 4 a to the first conductor portion 10 .

[0111] The end portion 8 b of the second feeder line 8 b is connected to the first conductor portion 10 .

[0112] Thereby, the feed conductor portion 8 including the feed point 8 a is connected to the first conductor portion 10 .

[0113] Therefore, the high-frequency signal supplied to the feeding point 8 a is supplied to the first conductor portion 10 .

[0114] As described above, the first conductor portion 10 and the short-circuit conductor portion 12 are conductor patterns mounted in the second area 2 a 2 .

[0115] like Figure 2 As shown, the first conductor portion 10 is in a strip shape. The first conductor portion 10 extends along the X direction. In the second region 2a2, the first conductor portion 10 and the edge portion 4a are disposed facing each other with a predetermined gap therebetween.

[0116] The strip shape refers to a shape that has a certain width, is elongated and continuous, and has a thickness smaller than the width, like a belt or a tape. In this specification, it refers to an elongated rectangular shape like the first conductor 10 and the power supply conductor 8 .

[0117] The linear shape is a continuous, elongated shape having substantially the same dimensions in directions perpendicular to the longitudinal direction in a cross section perpendicular to the longitudinal direction. In this specification, it refers to a cylindrical shape such as the second conductor 14 or a quadrangular prism with a substantially square cross section.

[0118] The first conductor portion 10 may also be linear.

[0119] One end 10a of the first conductor portion 10 is an open end. On the other hand, a short-circuit conductor portion 12 is connected to the other end 10b of the first conductor portion 10. The short-circuit conductor portion 12 is strip-shaped. The short-circuit conductor portion 12 extends along the Z2 direction from the end edge of the Z2 direction side of the first conductor portion 10. The short-circuit conductor portion 12 connects the other end 10b of the first conductor portion 10 to the first grounding conductor portion 4.

[0120] In addition, the feed conductor portion 8 is connected between one end 10 a and the other end 10 b of the first conductor portion 10 in the longitudinal direction.

[0121] Thus, the first conductor 10 has one end 10a as an open end, and the feed conductor 8 is connected between the one end 10a and the other end 10b of the first conductor 10. That is, the first conductor 10 constitutes an inverted-F antenna element, and the antenna 1 functions as an inverted-F antenna.

[0122] The second conductor part 14 is disposed on the first conductor part 10. Figure 1 As shown, the second conductor portion 14 protrudes from the first conductor portion 10 in the Y2 direction.

[0123] Figure 3 A diagram of the antenna 1 as seen from above and a cross-sectional view of a main part of the antenna 1 are shown. Figure 3 (a) is a diagram when the antenna 1 is viewed from the Z1 direction side (upper side).

[0124] like Figure 3 (a) and Figure 1 As shown, the second conductor part 14 (the main body part) is a solid wire-shaped (columnar) member made of a conductor such as copper.

[0125] The second conductor portion 14 protrudes from the middle portion 10c of the first conductor portion 10. The middle portion 10c is a portion located between one end 10a and the other end 10b of the first conductor portion 10 in the longitudinal direction.

[0126] The second conductor portion 14 has a first end portion 14a and a second end portion 14b. The second end portion 14b is an end portion on the opposite side of the first end portion 14a in the longitudinal direction of the second conductor portion 14.

[0127] The first end portion 14 a is connected to a predetermined position in the middle portion 10 c . Therefore, the high-frequency signal supplied to the feeding point 8 a is supplied to the second conductor portion 14 via the first conductor portion 10 .

[0128] In addition, the second end portion 14b is an open end.

[0129] like Figure 2 As shown in FIG. 1 , the connection position of the second conductor portion 14 in the X direction is a position on the middle portion 10c that is a distance L2 away from the end edge on the X1 direction side of the first conductor portion 10. In other words, the distance L2 is the distance along the X direction from the center of the second conductor portion 14 to the end edge on the X1 direction side of the first conductor portion 10. In addition, the connection position of the second conductor portion 14 in the Z direction is the center of the first conductor portion 10 in the Z direction.

[0130] Furthermore, the connection position of the second conductor portion 14 in the Z direction may be a position offset from the center of the first conductor portion 10 in the Z direction.

[0131] In the present embodiment, the connection position of the second conductor 14 is the same as the connection position of the power supply conductor 8 in the X direction. That is, the connection position of the second conductor 14 in the X direction is the center of the power supply conductor 8 in the X direction.

[0132] Figure 3 (b) shows a portion of the first end portion 14 a of the second conductor portion 14 in a cross section of the antenna 1 along the XY plane.

[0133] The first conductor portion 10 and the second conductor portion 14 are welded to each other by welding, brazing, soldering, or the like, for example.

[0134] The front end of the first end portion 14a of the second conductor portion 14 is in contact with the first surface 10s1 of the first conductor portion 10. Therefore, the second conductor portion 14 protrudes from the first surface 10s1. The first surface 10s1 is a surface of the first conductor portion 10 that contacts the dielectric substrate 2.

[0135] The dielectric substrate 2 is provided with a holding hole 30 . The holding hole 30 penetrates the dielectric substrate 2 in the Y direction so as to connect the first substrate surface 2a and the second substrate surface 2b. The second conductor portion 14 is inserted into the holding hole 30 . The second conductor portion 14 passes through the holding hole 30 .

[0136] The inner peripheral surface of the holding hole 30 is in contact with the outer peripheral surface of the second conductor portion 14. Thus, the holding hole 30 holds the first end portion 14a of the second conductor portion 14.

[0137] The holding hole 30 makes it easy to hold the second conductor portion 14 protruding from the first conductor portion 10 .

[0138] Alternatively, an adhesive layer may be formed between the inner peripheral surface of the holding hole 30 and the outer peripheral surface of the first end portion 14 a to fix the second conductor portion 14 to the dielectric substrate 2 .

[0139] Here, the second conductor portion 14 protrudes from the middle portion 10 c in a direction perpendicular to the substrate surfaces 2 a and 2 b .

[0140] Therefore, the second conductor portion 14 can excite polarization components that intersect with the substrate surfaces 2 a and 2 b .

[0141] As a result, it is possible to suppress a decrease in the gain of the polarization component orthogonal to the substrate surfaces 2 a and 2 b , and to interpolate the polarization component causing the gain decrease only in the first conductor portion 10 .

[0142] More specifically, according to the antenna 1 of this embodiment, it is possible to suppress Fig.35 The local decrease in gain that occurs in the horizontal polarization component on the XY plane and the vertical polarization component on the YZ plane, and the reduction in gain of the horizontal polarization component on the XZ plane are shown.

[0143] In addition, in the present embodiment, since (the main body of) the second conductor portion 14 is cylindrical, it is possible to uniformly excite the electromagnetic field component around the side surface of the second conductor portion 14 .

[0144] Furthermore, since the second conductor portion 14 of the present embodiment protrudes from the intermediate portion 10c in the direction perpendicular to the substrate surfaces 2a and 2b, it is possible to more effectively suppress a decrease in the gain of the polarization component perpendicular to the substrate surfaces 2a and 2b.

[0145] In addition, the length L1 of the first conductor portion 10 in the X direction, the distance L2 along the X direction from the end edge of the first conductor portion 10 on the X1 direction side to the center of the second conductor portion 14, the width of the first conductor portion 10 in the Z direction, the widths of the short-circuit conductor portion 12 in the X and Z directions, the length H of the second conductor portion 14 (the height from the front end of the second end portion 14b to the first surface 10s1), and the diameter of the second conductor portion 14 are appropriately set based on the frequency of the high-frequency signal supplied to the feeding point 8a and the polarization characteristics of the antenna 1 in consideration of the thickness of the dielectric substrate 2, the relative dielectric constant, the thickness of each conductor portion, etc.

[0146] The length H of the second conductor portion 14 preferably satisfies the following conditions.

[0147] That is, the ratio of the length (length H) of the second conductor 14 to the length (length L1) of the first conductor 10 is preferably 0.36 or more and 1.2 or less. If the ratio is less than 0.36, the effect of suppressing the gain reduction of the polarization component perpendicular to the substrate surface may not be fully obtained.

[0148] If the ratio is larger than 1.2, the effect of suppressing the decrease in gain of the polarization component perpendicular to the substrate surface may vary, and a stable effect may not be obtained.

[0149] By setting the ratio to 0.36 or more and 1.2 or less, it is possible to effectively suppress a decrease in the gain of the polarization component perpendicular to the substrate surface.

[0150] [About the second embodiment]

[0151] Figure 4 It is a perspective view showing an example of the antenna according to the second embodiment.

[0152] The present embodiment is different from the first embodiment in that the second conductor portion 14 includes a plate-shaped conductor portion 20 .

[0153] The plate-shaped conductor portion 20 is a circular plate-shaped member made of a conductor such as copper.

[0154] Figure 5It is a side view of the antenna 1 according to the second embodiment and a diagram when the antenna 1 is viewed from above. Figure 5 (a) shows a diagram when the antenna 1 is viewed from the Y2 direction. Figure 5 (b) shows a diagram when the antenna 1 is viewed from the Z1 direction side.

[0155] The second conductor portion 14 includes the above-mentioned plate-shaped conductor portion 20 and a main body portion 22 .

[0156] The main body 22 is a solid linear (cylindrical) member made of a conductor such as copper. One end 22a of the main body 22 constitutes the first end 14a of the second conductor 14. Therefore, the one end 22a is connected to the intermediate portion 10c.

[0157] The plate-shaped conductor portion 20 is fixed to the front end of the other end 22b of the main body portion 22. Therefore, the second end portion 14b of the second conductor portion 14 includes the other end 22b and the plate-shaped conductor portion 20.

[0158] The first surface 20 a and the second surface 20 b of the plate-shaped conductor portion 20 are parallel to the XZ plane. Therefore, the first surface 20 a and the second surface 20 b are along an intersecting surface intersecting the longitudinal direction of the second conductor portion 14 .

[0159] The first surface 20a is a surface facing the Y2 direction in the plate-shaped conductor portion 20. The second surface 20b is a surface facing the Y1 direction in the plate-shaped conductor portion 20.

[0160] The other end 22b is butted against the center of the second surface 20b of the plate-like conductor 20. The other end 22b and the plate-like conductor 20 are welded together by welding, brazing, etc. Thus, the other end 22b of the main body 22 and the plate-like conductor 20 are connected to each other.

[0161] In the present embodiment, the second end portion 14b of the second conductor portion 14 includes the plate-shaped conductor portion 20, so that a moderate capacitance component can be given to the second end portion 14b, and even if the length H of the second conductor portion 14 is further shortened, the decrease in the gain of the polarization component orthogonal to the substrate surface can be suppressed, similarly to the case of the second conductor portion 14 not including the plate-shaped conductor portion 20. As a result, the antenna 1 can be miniaturized as a whole.

[0162] In addition, the diameter D of the plate-shaped conductor portion 20 (the area of ​​the first surface 20a and the second surface 20b), the thickness of the plate-shaped conductor portion 20, and the length H of the second conductor portion 14 are appropriately set according to the dimensions of the other parts, the frequency of the high-frequency signal provided to the feeding point 8a, and the polarization characteristics of the antenna 1.

[0163] [About the third embodiment]

[0164] Figure 6 It is a perspective view showing an example of the antenna according to the third embodiment.

[0165] Figure 7 It is an enlarged view of the main part of the antenna 1 and a cross-sectional view of the main part of the antenna 1. Figure 7 (a) in FIG. 1 shows a main portion of the first surface 1 a of the antenna 1 . Figure 7 (b) shows a cross section viewed along line BB in (a).

[0166] The present embodiment is different from the first embodiment in that the first conductor portion 10 has a meander line structure.

[0167] like Figure 7 As shown, the other end 10b of the first conductor portion 10 is connected to the other end 8a2 of the first feeder line 8a. Thus, the feed point 8a of the feeder conductor portion 8 and the first conductor portion 10 are connected to each other.

[0168] Therefore, the power feeder conductor 8 of the present embodiment does not include the second power feeder line 8 b.

[0169] As described above, the first conductor portion 10 has a meander line structure. Therefore, the antenna 1 functions as a meander line antenna.

[0170] A meander line structure is a structure in which a linear or strip-shaped conductor zigzags along the path.

[0171] like Figure 7 As shown in (a) in FIG. 1 , the middle portion 10c of the first conductor portion 10 includes a plurality of first lines 26 parallel to the Z direction and a plurality of second lines 28 parallel to the X direction. The plurality of first lines 26 are arranged at equal intervals in the X direction. The plurality of second lines 28 connect the ends of a pair of first lines 26 adjacent to each other among the plurality of first lines 26. Thus, the first conductor portion 10 has a zigzag line structure.

[0172] The entire length of the first conductor portion 10 (the entire length at the center in the width direction) is appropriately set according to the frequency of the high-frequency signal supplied to the feeding point 8 a 1 .

[0173] The second conductor portion 14 is provided in a line 26a among the plurality of first lines 26. The line 26a is a line among the plurality of first lines 26 connected to the first feeder line 8a.

[0174] The distance L6 is a distance along the Z direction from the end edge on the Z1 direction side to the end edge on the Z2 direction side in the intermediate portion 10 c excluding the line 26 a .

[0175] The distance L7 is a distance from the end edge on the Z2 direction side of the intermediate portion 10 c excluding the line 26 a to the edge 4 a of the first ground conductor 4 .

[0176] The distance L4 is the distance along the Z direction from the end edge of the first conductor 10 on the Z1 direction side to the center of the second conductor 14. The distance L5 is the interval between a pair of adjacent first lines 26 among the plurality of first lines 26. The distance L5 does not include the width of the first line 26.

[0177] In the present embodiment, the second conductor 14 is provided in the line 26 a , but the second conductor 14 may be provided in a portion of the intermediate portion 10 c (the plurality of first lines 26 and the plurality of second lines 28 ) other than the line 26 a .

[0178] Furthermore, the second conductor portion 14 is preferably provided in a portion closer to the feed conductor portion 8 such as the line 26 a in the middle portion 10 c .

[0179] like Figure 7 As shown in (b) of FIG. 1 , the first end portion 14a of the second conductor portion 14 is connected to the middle portion 10c of the first conductor portion 10. The first conductor portion 10 and the second conductor portion 14 are welded.

[0180] The second conductor portion 14 protrudes from the line 26a in the Y2 direction. That is, the second conductor portion 14 protrudes from the first surface 10s1.

[0181] In this embodiment as well, it is possible to suppress a decrease in the gain of the polarization component orthogonal to the substrate surface.

[0182] In addition, the distances L4, L5, L6, L7, the width of the first line 26 in the X direction, the width of the second line 28 in the Z direction, the length H of the second conductor portion 14 (the height from the front end of the second end portion 14b to the first surface 10s1), the diameter of the second conductor portion 14, etc. can be appropriately set based on the frequency of the high-frequency signal provided to the feeding point 8a1 and the polarization characteristics of the antenna 1, taking into account the thickness of the dielectric substrate 2, the relative dielectric constant, the thickness of each conductor portion, etc.

[0183] [About the fourth embodiment]

[0184] Figure 8 It is a perspective view of the antenna 1 according to the fourth embodiment.

[0185] The present embodiment is different from the third embodiment in that the second conductor portion 14 includes a plate-shaped conductor portion 20 .

[0186] The plate-shaped conductor portion 20 is disposed at the second end portion 14b of the second conductor portion 14. The structure of the plate-shaped conductor portion 20 is similar to Figure 6 The second embodiment shown is the same.

[0187] In this case, the length H of the second conductor portion 14 can be shortened compared to the second conductor portion 14 that does not include the plate-shaped conductor portion 20 .

[0188] [About the fifth embodiment]

[0189] Fig. 9 It is an enlarged view of a main part of the first surface 1 a of the antenna 1 according to the fifth embodiment.

[0190] The present embodiment is different from the first embodiment in that the short-circuit conductor portion 12 is not included and the first conductor portion 10 is formed in an L-shape.

[0191] That is, the antenna 1 of the present embodiment functions as an inverted L-shaped antenna. Therefore, the first conductor portion 10 of the present embodiment constitutes an inverted L-shaped antenna element.

[0192] like Fig. 9 As shown, the middle portion 10c of the first conductor portion 10 includes a main portion 10c1 along the X direction and a bent portion 10c2 along the Z direction. The main portion 10c1 connects one end 10a to the bent portion 10c2. The bent portion 10c2 connects the other end 10b to the main portion 10c1.

[0193] The second conductor portion 14 is provided in the main body portion 10c1.

[0194] The other end 10b of the first conductor portion 10 is connected to the other end 8a2 of the first feeder line 8a. Thus, the feed point 8a of the feeder conductor portion 8 and the first conductor portion 10 are connected to each other.

[0195] Therefore, the power feeder conductor 8 of the present embodiment does not include the second power feeder line 8 b.

[0196] In this embodiment as well, it is possible to suppress a decrease in the gain of the polarization component orthogonal to the substrate surface.

[0197] Furthermore, in the present embodiment, the case where the second conductor portion 14 is provided in the main body portion 10c1 is exemplified, but the second conductor portion 14 may be provided in the bent portion 10c2.

[0198] [About the Sixth Implementation Method]

[0199] Fig.10 It is a cross-sectional view of a main part of an antenna 1 according to a sixth embodiment.

[0200] The present embodiment is different from the first embodiment in that the second conductor portion 14 protrudes from the first conductor portion 10 in the Y1 direction.

[0201] like Fig.10 As shown, the second conductor portion 14 is inserted into the holding hole 30 and the through hole 32 .

[0202] The through hole 32 penetrates the middle portion 10c of the first conductor portion 10 in a manner connecting the first surface 10s1 and the second surface 10s2. The second surface 10s2 is a surface on the opposite side of the first surface 10s1. The inner diameter of the through hole 32 is substantially the same as the inner diameter of the holding hole 30. In addition, the center of the inner circumferential surface of the through hole 32 coincides with the center of the inner circumferential surface of the holding hole 30.

[0203] The holding hole 30 of this embodiment is a bottomed hole opened only in the first substrate surface 2 a . Therefore, when the first end 14 a of the second conductor 14 is inserted into the holding hole 30 , the second conductor 14 can be easily positioned relative to the dielectric substrate 2 .

[0204] The first end portion 14a of the second conductor portion 14 is inserted into the holding hole 30 and the through hole 32. In this state, the first conductor portion 10 and the second conductor portion 14 are welded together by welding, brazing, soldering, or the like.

[0205] Thus, in this embodiment, the intermediate portion 10c has the through hole 32 into which the first end portion 14a is inserted. Thus, even when the second conductor portion 14 protrudes from the second surface 10s2 of the first conductor portion 10 opposite to the first surface 10s1, the second conductor portion 14 can be held by the holding hole 30.

[0206] [Regarding the seventh embodiment]

[0207] Fig.11 It is a perspective view of the antenna 1 according to the seventh embodiment.

[0208] This embodiment is different from the sixth embodiment in that the second conductor portion 14 has a spiral shape.

[0209] The second conductor portion 14 of the present embodiment is obtained by forming a wire material composed of a conductor into a spiral shape.

[0210] In this case as well, it is possible to suppress a decrease in the gain of the polarization component orthogonal to the substrate surface.

[0211] [Regarding Modifications of the Connection Method of the First Conductor 10 and the Second Conductor 14]

[0212] Fig.12 FIG. 1 is a diagram showing a modified example of the connection between the first conductor portion 10 and the second conductor portion 14. Fig.12 , the second conductor portion 14 is shown protruding from the first conductor portion 10 in the Y2 direction.

[0213] Fig.12 The modification shown in (a) is different from the first embodiment in that the second conductor portion 14 is inserted into the through hole 32 .

[0214] The through hole 32 of the middle portion 10c penetrates the middle portion 10c of the first conductor portion 10 so as to connect the first surface 10s1 and the second surface 10s2. The inner diameter of the through hole 32 is larger than the outer diameter of the first end portion 14a of the second conductor portion 14. An annular weld portion 50 is provided between the inner peripheral surface of the through hole 32 of the middle portion 10c and the outer peripheral surface of the first end portion 14a of the second conductor portion 14.

[0215] The welded portion 50 is formed of solder, for example. The welded portion 50 is formed as follows. First, the first end portion 14a of the second conductor portion 14 is inserted into the holding hole 30 and the through hole 32, and the second conductor portion 14 is fixed to the dielectric substrate 2. At this time, the position of the end surface 14a1 of the first end portion 14a in the Y direction is aligned with the position of the second surface 10s2 of the first conductor portion 10 in the Y direction.

[0216] Next, the molten solder is caused to flow into the annular space between the inner peripheral surface of the through hole 32 and the outer peripheral surface of the first end portion 14 a , thereby forming the welded portion 50 .

[0217] In the present modification, the first conductor portion 10 and the second conductor portion 14 are connected via the weld portion 50 interposed between the inner peripheral surface of the through hole 32 and the outer peripheral surface of the first end portion 14 a .

[0218] In addition, the second conductor portion 14 is held and fixed to the dielectric substrate 2 via the holding hole 30 and the fusion portion 50 .

[0219] Fig.12 The modification shown in (b) is different from the first embodiment in that the first end portion 14 a of the second conductor portion 14 slightly protrudes from the second surface 10 s 2 of the first conductor portion 10 .

[0220] In this modification, the second conductor portion 14 is also inserted into the holding hole 30 and the through hole 32 .

[0221] The inner diameter of the through hole 32 is substantially the same as that of the holding hole 30. The center of the inner peripheral surface of the through hole 32 coincides with that of the holding hole 30. Therefore, the inner peripheral surface of the through hole 32 contacts the outer peripheral surface of the first conductor portion 10.

[0222] The second surface 10s2 of the first conductor 10 is provided with a welded portion 52. The welded portion 52 is formed of, for example, solder. The welded portion 52 is formed so as to cover the outer surface of the first end portion 14a protruding from the second surface 10s2 and its periphery.

[0223] The first conductor portion 10 and the second conductor portion 14 are connected via the welded portion 52 .

[0224] In addition, the second conductor portion 14 is held and fixed to the dielectric substrate 2 via the holding hole 30 and the fusion portion 52 .

[0225] In addition, Fig.12 In the figure, the second conductor portion 14 is shown to protrude from the first conductor portion 10 in the Y2 direction. However, in the case where the second conductor portion 14 protrudes from the first conductor portion 10 in the Y1 direction, the same Fig.12 The same structure as shown connects the first conductor part 10 to the second conductor part 14 .

[0226] exist Fig.12 In (a), the position of the end surface 14a1 of the first end portion 14a in the Y direction is aligned with the position of the second surface 10s2 of the first conductor portion 10 in the Y direction, but the second conductor portion 14 can be arranged to protrude from the second surface 10s2 of the first conductor portion 10 in the Y1 direction. Fig.12 The structure shown in (a) connects the first conductor portion 10 and the second conductor portion 14 , and makes the second conductor portion 14 protrude from the first conductor portion 10 in the Y1 direction.

[0227] exist Fig.12 In (b), the first end portion 14a protruding from the second surface 10s2 is covered by the weld portion 52, but the second conductor portion 14 can protrude from the weld portion 52 in the Y1 direction. Fig.12 In the structure shown in (b), the first conductor portion 10 and the second conductor portion 14 are connected, and the second conductor portion 14 is made to protrude from the first conductor portion 10 in the Y1 direction.

[0228] Fig.12 The modified example shown is shown as a modified example of the first embodiment, but can also be applied to the above-mentioned respective embodiments using the linear second conductor portion 14 .

[0229] [About the Eighth Implementation Method]

[0230] Fig.13 It is a perspective view of the antenna 1 according to the eighth embodiment.

[0231] Fig.14 A diagram showing an antenna 1 according to an eighth embodiment when viewed from above and a cross-sectional view of a main part of the antenna 1 are shown. Fig.14 (a) is a diagram when the antenna 1 is viewed from the Z1 direction side.

[0232] The present embodiment is different from the first embodiment in that the second conductor portion 34 is strip-shaped.

[0233] Furthermore, the present embodiment is also different from the first embodiment in that the second conductor portion 34 protrudes in the Y1 direction.

[0234] The second conductor portion 34 includes a main body portion 42 , a plate-shaped conductor portion 40 , and a base-end conductor portion 41 .

[0235] The second conductor part 34 of the present embodiment is formed by bending both ends of a strip-shaped conductor component at right angles. Therefore, the main body 42 is strip-shaped. The plate-shaped conductor part 40 and the base-end conductor part 41 are rectangular plates. In addition, the width dimensions of the main body 42, the plate-shaped conductor part 40 and the base-end conductor part 41 along the Z direction are the same. The width dimensions of the main body 42, the plate-shaped conductor part 40 and the base-end conductor part 41 in the Z direction are less than the width dimension of the first conductor part 10 in the Z direction.

[0236] like Fig.14 As shown in (a) in FIG. 8 , the base end conductor portion 41 is connected to one end 42 a of the main body portion 42 .

[0237] The plate-shaped conductor portion 40 is connected to the other end 42 b of the main body portion 42 .

[0238] The second end portion 34b of the second conductor portion 34 includes the other end 42b and the plate-shaped conductor portion 40. The plate-shaped conductor portion 40 extends from the other end 42b in the X1 direction.

[0239] As described above, the length of the second conductor portion 34 along the Y direction when the second end portion 34 b includes the plate-shaped conductor portion 40 can be shorter than the length of the second end portion 34 b when the plate-shaped conductor portion 40 is not included.

[0240] The first end portion 34a of the second conductor portion 34 includes one end 42a and a base-end conductor portion 41. The base-end conductor portion 41 extends from the one end 42a in the X1 direction.

[0241] The base end conductor portion 41 is fixed to the intermediate portion 10 c . As a result, the second conductor portion 34 (main body portion 42 ) protrudes from the first conductor portion 10 in the Y1 direction.

[0242] The base end conductor part 41 is arranged along the middle part 10c. That is, the base end conductor part 41 faces the middle part 10c.

[0243] Fig.14 (b) shows a portion of the first end portion 34 a of the second conductor portion 34 in a cross section of the antenna 1 along the XY plane.

[0244] The base end conductor part 41 has a first surface 41 a facing the first conductor part 10 . The first surface 41 a faces the second surface 10 s 2 . The first surface 41 a is a surface facing the opposite side of the main body part 42 .

[0245] An insulating adhesive layer 43 is provided between the first surface 41 a and the second surface 10 s 2 .

[0246] The insulating adhesive layer 43 is interposed between the first surface 41 a and the second surface 10 s 2 , and fixes the base-end conductor portion 41 to the second surface 10 s 2 .

[0247] The insulating adhesive layer 43 is made of, for example, an insulating resin or the like. The insulating adhesive layer 43 is formed by using an insulating resin adhesive, a double-sided tape, or the like.

[0248] The base conductor 41 is connected to the first conductor 10 at high frequency. That is, the base conductor 21 is capacitively coupled to the first conductor 10. Thus, the high frequency signal supplied to the feeding point 8a is transmitted between the first conductor 10 and the base conductor 41 and supplied to the second conductor 34.

[0249] The area of ​​the first surface 41 a , the thickness of the insulating adhesive layer 43 , the dielectric constant of the insulating adhesive layer 43 , and the like are appropriately set according to the frequency of the high-frequency signal supplied to the feeding point 8 a 1 and the polarization characteristics of the antenna 1 .

[0250] In this embodiment, the first end portion 34a of the second conductor portion 34 includes the plate-shaped base conductor portion 41 along the middle portion 10c. Therefore, the first end portion 34a of the second conductor portion 34 and the middle portion 10c can be easily connected by making the base conductor portion 41 face the middle portion 10c.

[0251] In addition, in the present embodiment, since the insulating adhesive layer 43 is provided between the base end conductor portion 41 and the intermediate portion 10 c , the intermediate portion 10 c and the second conductor portion 34 can be capacitively coupled and fixed to each other.

[0252] Furthermore, in this embodiment, since the second conductor portion 34 includes the strip-shaped main body portion 42 , it can be easily processed into a desired shape, for example, by bending one end of the strip-shaped conductor member and providing the base conductor portion 41 at one end 42 a of the main body portion 42 .

[0253] Fig.15 It is a perspective view of the second end portion 34 b of the second conductor portion 34 according to a modification of the eighth embodiment.

[0254] In the eighth embodiment, the case where the plate-shaped conductor portion 40 has a rectangular shape is shown.

[0255] However, if Fig.15 As shown in (a) in FIG. 8 , the plate-shaped conductor portion 40 may have a circular shape.

[0256] exist Fig.15 In the modification example (a) of FIG. 1 , the main body 42 and the plate-shaped conductor 40 are formed by bending a single conductor plate. Therefore, the other end 42 b of the main body 42 is connected to the edge of the plate-shaped conductor 40 .

[0257] In addition, if Fig.15 As shown in (b) in FIG. 1 , the plate-shaped conductor portion 40 may include a bent portion 40 a and a plate-shaped portion 40 b .

[0258] The bent portion 40 a is provided by bending a single conductor plate in a state connected to the other end 42 b similarly to the plate-shaped conductor portion 40 of the eighth embodiment.

[0259] The plate-shaped portion 40b has a circular shape.

[0260] The bent portion 40 a and the plate-shaped portion 40 b are fixed to each other by welding by welding, soldering, brazing, or solder, or by an adhesive layer by an insulating resin or the like, for example.

[0261] The bent portion 40a is fixed to the approximate center of the plate-shaped portion 40b.

[0262] According to this modification, when the plate-shaped second conductor portion 34 is adopted, the shape and area of ​​the plate-shaped conductor portion 40 can be easily changed.

[0263] also, Fig.15 The modified examples shown can also be applied to the eighth embodiment, Fig.16 Other modifications of the eighth embodiment are shown.

[0264] Fig.16 It is a cross-sectional view of a main part of the antenna 1 according to another modified example of the eighth embodiment.

[0265] In the eighth embodiment, the second conductor portion 34 protrudes in the Y1 direction. In contrast, in this modification, the second conductor portion 34 protrudes in the Y2 direction.

[0266] like Fig.16 As shown, in this modification, there are pads 46 and through holes 48. The pads 46 are conductor patterns provided on the second substrate surface 2b of the dielectric substrate 2. The through holes 48 penetrate the dielectric substrate 2. The through holes 48 connect the middle portion 10c of the first conductor 10 to the pads 46.

[0267] The base end conductor portion 41 of the second conductor portion 34 is fixed to the land portion 46 via the insulating adhesive layer 43 .

[0268] Therefore, the high-frequency signal supplied to the feeding point 8 a 1 is transmitted to the base-end conductor portion 41 via the first conductor portion 10 , the through hole 48 , and the land portion 46 , and is supplied to the second conductor portion 34 .

[0269] [Regarding Modifications of the Connection Method between the First Conductor 10 and the Second Conductor 34]

[0270] Fig.17 1 and 2 are diagrams showing a modification of the connection between the first conductor portion 10 and the second conductor portion 34 .

[0271] Fig.17The modification shown in (a) is different from the eighth embodiment in that the second conductor portion 34 is inserted into the holding hole 60 and the through hole 62 .

[0272] The holding hole 60 penetrates the dielectric substrate 2 along the Y direction so as to connect the first substrate surface 2a and the second substrate surface 2b. The holding hole 60 is a hole having a rectangular cross section corresponding to the cross-sectional shape of the second conductor portion 34. The inner surface of the holding hole 60 and the outer surface of the second conductor portion 34 are in contact with each other. Thus, the holding hole 60 holds the second conductor portion 34.

[0273] The through hole 62 penetrates the middle portion 10c of the first conductor portion 10 so as to connect the first surface 10s1 and the second surface 10s2. The cross-sectional shape of the through hole 62 is substantially the same as the cross-sectional shape of the holding hole 60. In addition, the contour of the inner surface of the through hole 62 is substantially the same as the contour of the inner surface of the holding hole 60.

[0274] As described above, the second conductor portion 34 is inserted into the holding hole 60 and the through hole 62. The main body portion 42 of the second conductor portion 14 passes through the holding hole 60 and the through hole 62.

[0275] The plate-shaped conductor portion 40 and the base-end conductor portion 41 of the present modification extend in the X2 direction relative to the main body portion 42 .

[0276] The base conductor part 41 protrudes from the second surface 10s2. In addition, the base conductor part 41 is along the second surface 10s2 of the first conductor part 10. The second surface 41b of the base conductor part 41 is in contact with the second surface 10s2 of the first conductor part 10.

[0277] The second surface 10s2 of the first conductor portion 10 is provided with a welding portion 64. The welding portion 64 is formed of, for example, solder. The welding portion 64 is formed so as to cover the outer surface of the base end conductor portion 41 protruding from the second surface 10s2 and its periphery.

[0278] The first conductor portion 10 and the second conductor portion 34 are connected via the weld portion 64 .

[0279] In addition, the second conductor portion 34 is held and fixed to the dielectric substrate 2 via the holding hole 60 and the weld portion 64 .

[0280] The second conductor portion 34 of this modification example is provided on the dielectric substrate 2 as follows.

[0281] First, a strip material, which is a material of the second conductor portion 34 , is inserted into the holding hole 60 and the through-hole 62 .

[0282] Next, the two ends of the strip material are bent to form the plate-shaped conductor part 40 and the base conductor part 41. At this time, the end of the base conductor part 41 is made to protrude from the second surface 10s2 of the first conductor part 10 by a length required for the base conductor part 41, and the protruding portion is bent along the second surface 10s2. The bent portion becomes the base conductor part 41.

[0283] Next, the welding portion 64 is provided along the second surface 10s2 on which the base end conductor portion 41 is provided.

[0284] As described above, the second conductor portion 34 of the present modification example is provided on the dielectric substrate 2 .

[0285] Fig.17 The modification shown in (b) is different from the eighth embodiment in that the second conductor portion 34 is inserted into the holding hole 60 and the through hole 62 and the second conductor portion 34 protrudes from the first conductor portion 10 in the Y1 direction.

[0286] The base conductor portion 41 of the present embodiment protrudes from the second substrate surface 2b. The base conductor portion 41 is along the second substrate surface 2b of the dielectric substrate 2. The second surface 41b of the base conductor portion 41 is in contact with the second substrate surface 2b.

[0287] The weld portion 66 of the present embodiment is formed so as to cover the outer surface of the main body portion 42 of the second conductor portion 34 protruding from the second surface 10s2 and its periphery.

[0288] The first conductor portion 10 and the second conductor portion 34 are connected via the weld portion 66 .

[0289] In addition, the second conductor portion 34 is held and fixed to the dielectric substrate 2 via the holding hole 60 and the weld portion 64 .

[0290] The second conductor portion 34 of this modification example is provided on the dielectric substrate 2 as follows.

[0291] First, a strip material, which is a material of the second conductor portion 34 , is inserted into the holding hole 60 and the through-hole 62 .

[0292] Next, the two ends of the strip material are bent to form a plate-shaped conductor part 40 and a base conductor part 41. At this time, the end of the base conductor part 41 is made to protrude from the second substrate surface 2b to a length required for the base conductor part 41, and the protruding portion is bent along the second substrate surface 2b. The bent portion becomes the base conductor part 41.

[0293] Next, the welded portion 64 is provided on the second surface 10s2 from which the main body portion 42 protrudes.

[0294] As described above, the second conductor portion 34 of the present modification example is provided on the dielectric substrate 2 .

[0295] Fig.18 1 and 2 are diagrams showing other modified examples of the connection between the first conductor portion 10 and the second conductor portion 34 .

[0296] Fig.18 The modified example shown is different from the modified example in that the dimensions of the holding hole 60 and the through hole 62 in the X direction are enlarged. Fig.17 The variations shown are different.

[0297] The dimensions of the holding hole 60 and the through hole 62 in the present modification example in the X direction are larger than at least one of the dimensions of the plate-shaped conductor portion 40 in the X direction and the dimensions of the base-end conductor portion 41 in the X direction.

[0298] Therefore, in this modification, both ends of the strip material as the material of the second conductor part 34 are bent to provide the plate-shaped conductor part 40 and the base end conductor part 41 , and the member formed as the second conductor part 34 can be inserted into the holding hole 60 and the through hole 62 .

[0299] like Fig.18 As shown, the base conductor 41 of the second conductor 34 inserted into the holding hole 60 and the through hole 62 protrudes from the second surface 10s2 and along the second surface 10s2 of the first conductor 10. The second surface 41b of the base conductor 41 contacts the second surface 10s2 of the first conductor 10.

[0300] The weld portion 66 is formed so as to cover the outer surface of the main body portion 42 of the second conductor portion 34 protruding from the second surface 10s2 and its periphery.

[0301] Thus, the first conductor portion 10 and the second conductor portion 34 are connected.

[0302] In addition, the second conductor portion 34 is held and fixed to the dielectric substrate 2 via the holding hole 60 and the weld portion 64 .

[0303] In addition, Fig.18 In FIG. 1 , the second conductor portion 34 is shown to protrude from the first conductor portion 10 in the Y2 direction. Fig.18 The plate-shaped conductor portion 40 in the second substrate surface 2b is in contact with the second substrate surface 2b. Fig.18 The base end conductor portion 41 in the embodiment is separated from the first conductor portion 10 , and the second conductor portion 34 can be made to protrude from the first conductor portion 10 in the Y1 direction.

[0304] In this case, Fig.18 The base end conductor portion 41 in the structure functions as a plate-shaped conductor portion. Fig.18 The plate-shaped conductor portion 40 in the structure functions as a base-end conductor portion.

[0305] In making Fig.18The base end conductor portion 41 in the Fig.18 When the plate-shaped conductor portion 40 functions as the base end conductor portion, the weld portion 64 is formed to cover the outer surface of the main body portion 42 of the second conductor portion 34 protruding from the second surface 10s2 and its periphery.

[0306] In the case of this modification, the second conductor portion 34 including the plate-shaped conductor portion 40 and the base end conductor portion 41 can be inserted into the holding hole 60 and the through hole 62 , so the second conductor portion 34 can be easily provided on the dielectric substrate 2 .

[0307] Furthermore, since the second conductor portion 34 , the dielectric substrate 2 and other components having the same structure can be used and the protruding direction can be selected from either the Y1 direction or the Y2 direction, cost reduction can be achieved.

[0308] [Regarding other modified examples]

[0309] In the first to seventh embodiments described above, a case where a solid linear component made of a conductor is used as the second conductor portion 14 (main body portion 22 ) is exemplified, but the second conductor portion 14 can be configured as a component having a hollow rod shape and a conductor film provided on the surface of the component and connected to the first conductor portion 10 .

[0310] In addition, the shape of the plate-shaped conductor part 20 of the second embodiment and the fourth embodiment and the shape of the plate-shaped conductor part 40 of the eighth embodiment are set to a circular shape, but they can also be shapes other than a circular shape such as a polygon. However, from the viewpoint of uniformly exciting the electromagnetic field component around the plate-shaped conductor parts 20 and 40, the plate-shaped conductor parts 20 and 40 are preferably circular.

[0311] In the second, fourth and eighth embodiments, the examples are described in which the plate-shaped conductor portion 20 ( 40 ) is fixed in a state of being butted against the other end 22 b ( 42 b ) of the main body portion 22 ( 42 ).

[0312] However, when the plate-shaped conductor part 20 ( 40 ) has a hole, the plate-shaped conductor part 20 ( 40 ) may be fixed to the other end 22 b ( 42 b ) with the other end 22 b ( 42 b ) inserted into the hole.

[0313] In this case, the other end 22b (42b) may pass through the plate-shaped conductor 20 (40). Thus, the plate-shaped conductor 20 (40) moves along the main body 22 (42), and the mounting position of the plate-shaped conductor 20 (40) in the longitudinal direction of the main body 22 (42) can be adjusted.

[0314] In addition, the above-mentioned embodiments can be combined as appropriate.

[0315] For example, when the antenna 1 includes the second conductor portion 14 protruding from the first conductor portion 10 in the Y1 direction as in the sixth embodiment, the second conductor portion 14 may include the plate-shaped conductor portion 20 .

[0316] In the seventh embodiment, the spiral second conductor 14 protrudes from the first conductor 10 in the Y1 direction. However, the spiral second conductor 14 may protrude from the first conductor 10 in the Y2 direction.

[0317] In the eighth embodiment, the case where the second conductor portion 34 composed of a rectangular plate-like member is provided in the first conductor portion 10 constituting the inverted F-type antenna element is exemplified, but the second conductor portion 34 composed of a rectangular plate-like member may also be provided in the first conductor portion 10 having a zigzag line structure.

[0318] Furthermore, in each embodiment, the combination applicable to the first conductor portion 10 constituting the inverted-F type antenna element can also be applied to the first conductor portion 10 constituting the inverted-L type antenna element described in the fifth embodiment.

[0319] In the above-described embodiments, the case where the second ground conductor portion 6 is provided on the second substrate surface 2b is exemplified. However, a configuration may be adopted in which the second ground conductor portion 6 is not provided on the second substrate surface 2b.

[0320] In this case, the plurality of through holes 19 connecting the second ground conductor 6 and the first ground conductor 4 are not required.

[0321] In the above embodiments, the second conductors 14 and 34 protrude from the middle portion 10c in a direction perpendicular to the substrate surfaces 2a and 2b. However, the second conductors 14 and 34 only need to protrude from the middle portion 10c and may protrude in a direction intersecting the substrate surfaces 2a and 2b.

[0322] In the first and sixth embodiments, the cylindrical second conductor 14 is inserted into the holding hole 30 , but the strip-shaped second conductor 14 may be inserted into the holding hole. In this case, the holding hole is formed into a rectangular shape to match the shape of the second conductor 14 .

[0323] [About verification test 1]

[0324] Next, a verification test 1 conducted on the effect of the antenna 1 will be described.

[0325] As a test method, a model of the antenna 1 was constructed, and the directivity characteristics of the antenna 1 were obtained by computer simulation using the model. The frequency of the high-frequency signal used as the target of the antenna 1 was set to 2.45 GHz.

[0326] In verification test 1, the following four embodiments and two comparative examples were used as test objects, and the radiation patterns of the vertical polarization component and the horizontal polarization component were obtained. By comparing the obtained patterns, the effect of the antenna 1 was verified.

[0327] Furthermore, the thickness of each of the first ground conductor portion 4 , the second ground conductor portion 6 , the power supply conductor portion 8 , the first conductor portion 10 , and the short-circuit conductor portion 12 is set to 36 μm.

[0328] Example 1

[0329] The antenna 1 described in the first embodiment is constructed as a model of Example 1.

[0330] That is, in Example 1, the antenna 1 including the second conductor portion 14 which does not include the plate-shaped conductor portion 20 was verified.

[0331] The dimensions of each portion of the first conductor portion 10 and the second conductor portion 14 are set as follows.

[0332] Length L1: 27mm

[0333] Distance L2: 11mm

[0334] Width of the first conductor 10 in the Z direction: 3 mm

[0335] Width of short-circuit conductor 12 in X direction: 4 mm

[0336] Width from the end edge of the first conductor 10 in the Z1 direction to the edge 4a of the first ground conductor 4: 8 mm

[0337] Diameter of the second conductor 14: 0.3 mm

[0338] Length H of the second conductor 14: 30 mm

[0339] Example 2

[0340] The antenna 1 shown in the second embodiment is constructed as a model of Example 2.

[0341] That is, in the second embodiment, the antenna 1 including the second conductor portion 14 including the plate-shaped conductor portion 20 was verified.

[0342] The length H of the second conductor portion 14 is set to 20 mm.

[0343] In addition, the diameter D of the plate-shaped conductor part 20 was set to 10 mm.

[0344] The model according to Example 2 was set to be the same as the model of Example 1 except that the second conductor portion 14 had a plate-shaped conductor portion 20 and the length H was 20 mm.

[0345] Example 3

[0346] The antenna 1 having the meander line structure shown in the third embodiment is constructed as a model of Example 3.

[0347] That is, in Example 3, the antenna 1 including the second conductor portion 14 which does not include the plate-shaped conductor portion 20 was verified.

[0348] The dimensions of each portion of the first conductor portion 10 and the second conductor portion 14 are set as follows.

[0349] The total length of the first conductor 10: 186.5 mm

[0350] Distance L4: 3.25mm

[0351] Distance L5: 1.0mm

[0352] Distance L6: 10mm

[0353] Distance L7: 0.75mm

[0354] Width of the first line 26 in the X direction: 0.5 mm

[0355] Width of the second line 28 in the Z direction: 0.5 mm

[0356] Diameter of the second conductor 14: 0.3 mm

[0357] Length H of the second conductor 14: 30 mm

[0358] Example 4

[0359] The antenna 1 having the meander line structure shown in the fourth embodiment is constructed as a model of Example 4.

[0360] That is, in Example 4, the antenna 1 including the second conductor portion 14 including the plate-shaped conductor portion 20 was verified.

[0361] The length H of the second conductor portion 14 is set to 20 mm.

[0362] In addition, the diameter D of the plate-shaped conductor part 20 was set to 10 mm.

[0363] The model according to Example 4 was set to be the same as the model of Example 3 except that the second conductor portion 14 had a plate-shaped conductor portion 20 and the length H was 20 mm.

[0364] Comparative Example 1

[0365] As a model of Comparative Example 1, a structure in which the second conductor portion 14 is removed from the antenna 1 shown in the first embodiment is constructed.

[0366] Comparative Example 2

[0367] As a model of Comparative Example 2, a structure in which the second conductor portion 14 is removed from the antenna 1 shown in the third embodiment is constructed.

[0368] Comparison between Example 1 and Comparative Example 1

[0369] Fig.19 1 is a diagram showing radiation patterns of the vertical polarization component and the horizontal polarization component of Example 1 and Comparative Example 1 on the XY plane.

[0370] exist Fig.19 In FIG. 1 , the solid line represents the radiation pattern of Example 1. The dotted line represents the radiation pattern of Comparative Example 1.

[0371] exist Fig.19 In the figure, "0" indicates the X1 direction and "90" indicates the Y1 direction.

[0372] like Fig.19 As shown, regarding the vertical polarization component on the XY plane, there is no significant difference between Example 1 and Comparative Example 1. In addition, in both Example 1 and Comparative Example 1, there is no decrease in gain.

[0373] On the other hand, regarding the horizontal polarization component, in Comparative Example 1, a local decrease in gain occurs along the X direction.

[0374] On the other hand, in Example 1, it can be seen that the local gain reduction that occurs in Comparative Example 1 is suppressed.

[0375] Fig. 20 1 is a diagram showing radiation patterns of the vertical polarization component and the horizontal polarization component of Example 1 and Comparative Example 1 on the YZ plane.

[0376] Fig.21 1 is a diagram showing radiation patterns of the vertical polarization component and the horizontal polarization component of Example 1 and Comparative Example 1 on the XZ plane.

[0377] Fig. 20 , Fig.21 In FIG. 1 , the solid line represents the radiation pattern of Example 1. The dotted line represents the radiation pattern of Comparative Example 1.

[0378] exist Fig. 20 In , "0" indicates the Z1 direction and "90" indicates the Y1 direction. Fig.21 In the figure, "0" indicates the Z1 direction and "90" indicates the X1 direction.

[0379] like Fig. 20As shown, regarding the horizontal polarization component on the YZ plane, there is no significant difference between Example 1 and Comparative Example 1. In addition, in both Example 1 and Comparative Example 1, there is no decrease in gain.

[0380] On the other hand, regarding the vertical polarization component, in Comparative Example 1, a local gain drop occurs along the Z direction.

[0381] On the other hand, in Example 1, it can be seen that the local gain reduction that occurs in Comparative Example 1 is suppressed.

[0382] like Fig.21 As shown, regarding the vertical polarization component on the XZ plane, there is no significant difference between Example 1 and Comparative Example 1. In addition, in both Example 1 and Comparative Example 1, there is no significant decrease in gain.

[0383] On the other hand, regarding the horizontal polarization component, in Comparative Example 1, the gain in the omnidirectional direction is extremely low.

[0384] On the other hand, in Example 1, it can be seen that the decrease in gain in all directions that occurred in Comparative Example 1 was suppressed.

[0385] Comparison between Example 2 and Comparative Example 1

[0386] Fig. 22 It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 2 and Comparative Example 1 on the XY plane.

[0387] Fig.23 The diagrams show radiation patterns of the vertical polarization component and the horizontal polarization component of Example 2 and Comparative Example 1 on the YZ plane.

[0388] Fig.24 It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 2 and Comparative Example 1 on the XZ plane.

[0389] Figure 22~Figure 24 The expression method and Figure 19~Figure 21 The representation method is the same.

[0390] In Example 2, similarly to Example 1, it can be seen that local decreases in gain occurring in the horizontal polarization component on the XY plane and the vertical polarization component on the YZ plane are suppressed.

[0391] In addition, in Embodiment 2, a decrease in gain in all directions occurring in the horizontal polarization component on the XZ plane is also suppressed.

[0392] Comparison between Example 3 and Comparative Example 2

[0393] Fig.25It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 3 and Comparative Example 2 on the XY plane.

[0394] Fig.26 It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 3 and Comparative Example 2 on the YZ plane.

[0395] Fig. 27 The diagrams show radiation patterns of the vertical polarization component and the horizontal polarization component of Example 3 and Comparative Example 2 on the XZ plane.

[0396] Figure 25~Figure 27 The expression method and Figure 19~Figure 21 The representation method is the same.

[0397] In Example 3, it can be seen that local decreases in gain occurring in the horizontal polarization component on the XY plane and the vertical polarization component on the YZ plane, and decreases in gain in all directions occurring in the horizontal polarization component on the XZ plane are suppressed.

[0398] Comparison between Example 4 and Comparative Example 2

[0399] Fig.28 It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 4 and Comparative Example 2 on the XY plane.

[0400] Fig.29 It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 4 and Comparative Example 2 on the YZ plane.

[0401] Fig.30 It is a diagram showing the radiation patterns of the vertical polarization component and the horizontal polarization component of Example 4 and Comparative Example 2 on the XZ plane.

[0402] Figure 28~Figure 30 The expression method and Figure 19~Figure 21 The representation method is the same.

[0403] In Example 4, it can be seen that local decreases in gain occurring in the horizontal polarization component on the XY plane and the vertical polarization component on the YZ plane, and decreases in gain in all directions occurring in the horizontal polarization component on the XZ plane are suppressed.

[0404] From the above results, it is understood that a decrease in the gain of the polarization component orthogonal to the substrate surface can be suppressed.

[0405] More specifically, it was confirmed that a local decrease in gain occurring in the horizontal polarization component on the XY plane and the vertical polarization component on the YZ plane and a decrease in the gain of the horizontal polarization component on the XZ plane can be suppressed.

[0406] [About verification test 2]

[0407] Next, a verification test 2 performed to evaluate the length H of the second conductor portion 14 of the antenna 1 will be described.

[0408] As a test method, a plurality of values ​​of the length H of the second conductor portion 14 are set, the polarization characteristics of each of the plurality of set values ​​are obtained, and the relationship between the length H of the second conductor portion 14 and the polarization characteristics is evaluated.

[0409] Furthermore, in verification test 2, a gain difference Δ (minimum value−maximum value) between the minimum value and the maximum value of the gain in the polarization characteristics of each of the XY plane and the YZ plane was obtained, and the relationship between the gain difference Δ and the length H was obtained.

[0410] The gain difference Δ indicates the degree of local decrease in gain in the polarization characteristic. It can be said that the closer the gain difference Δ is to 0, the smaller the local decrease is.

[0411] In addition, in the verification test 2, the following Examples 5, 6, and 7 were used as test objects.

[0412] Example 5

[0413] The model was set to be the same as that of Example 1 except that the length H of the second conductor portion 14 was changed within the range of 0 to 120 mm.

[0414] In Example 5, the antenna 1 including the second conductor portion 14 which does not include the plate-shaped conductor portion 20 was verified.

[0415] Example 6

[0416] The model was set to be the same as that of the second embodiment except that the length H of the second conductor portion 14 was changed within a range of 0 to 120 mm and the diameter D of the plate-shaped conductor portion 20 was set to 6 mm.

[0417] In Example 6, the antenna 1 including the second conductor portion 14 including the plate-shaped conductor portion 20 was verified.

[0418] Example 7

[0419] The model was set to be the same as that of the second embodiment except that the length H of the second conductor portion 14 was changed within the range of 0 to 120 mm.

[0420] In the sixth embodiment, the antenna 1 including the second conductor portion 14 including the plate-shaped conductor portion 20 having a larger diameter than that of the sixth embodiment was verified.

[0421] Fig.311 is a diagram showing the relationship between the gain difference Δ of the perpendicular polarization component on the XY plane and the length H of the second conductor portion 14 .

[0422] Fig.32 1 is a diagram showing the relationship between the gain difference Δ of the horizontal polarization component on the XY plane and the length H of the second conductor portion 14 .

[0423] Fig.33 3 is a diagram showing the relationship between the gain difference Δ of the vertical polarization component on the YZ plane and the length H of the second conductor portion 14 .

[0424] Figure 31~Figure 33 The vertical axis in represents the gain difference Δ in each polarization component. Figure 31~Figure 33 The horizontal axis in φ represents the length H of the second conductor portion 14 .

[0425] In addition, Figure 31~Figure 33 , the line graph g5 represents the gain difference Δ of Example 5. The line graph g6 represents the gain difference Δ of Example 6. The line graph g7 represents the gain difference Δ of Example 7.

[0426] exist Fig.31 Observe the line graph g5. In the range of length H from 0 mm to 30 mm, the gain difference Δ gradually approaches 0 as the length H increases.

[0427] exist Fig.31 Observing the line graph g6, in the range of the length H from 0 mm to 30 mm, the gain difference Δ is closest to 0 when the length H is about 18 mm.

[0428] In addition, Fig.31 Observe the line graph g7. In the range of the length H from 0 mm to 30 mm, the gain difference Δ is closest to 0 when the length H is 12 mm.

[0429] The gain difference Δ when each of the graphs g5, g6, and g7 is closest to 0 is approximately -10 dB.

[0430] From these results, it can be seen that the length H of the second conductor 14 of Examples 6 and 7, in which the gain difference Δ is closest to zero, is smaller than the length H of the second conductor 14 of Example 5, in which the gain difference Δ is closest to zero.

[0431] That is, by providing the plate-shaped conductor portion 20 in the second conductor portion 14 , the length H that can effectively suppress the local decrease in the vertical polarization characteristic from becoming smaller.

[0432] In addition, Fig.32 , Fig.33 The same result was obtained in .

[0433] These results show that, by including the plate-shaped conductor portion 20 , the length H of the second conductor portion 14 can be made shorter than the length H of the second conductor portion 14 not including the plate-shaped conductor portion 20 .

[0434] Furthermore, it can be seen from the above results that by increasing the diameter D of the plate-shaped conductor part 20, the length H of the local drop in the vertical polarization characteristic can be effectively suppressed from becoming smaller. It can be seen from the results that by further increasing the diameter D of the plate-shaped conductor part 20 of the second conductor part 14, the length H of the second conductor part 14 can be further shortened.

[0435] In addition, observe Figure 31~Figure 33 When the length H of the second conductor 14 is less than 10 mm, the gain difference Δ tends to greatly deviate from 0. When the length H of the second conductor 14 is greater than 30 mm, the gain difference Δ tends to greatly fluctuate.

[0436] When the length H of the second conductor portion 14 is 10 mm, the ratio of the length H to the length (length L1) of the first conductor portion 10 is 0.37. When the length H of the second conductor portion 14 is 30 mm, the ratio of the length H to the length (length L1) of the first conductor portion 10 is 1.1.

[0437] That is, according to Figure 31~Figure 33 It can be seen that when the ratio of the length H of the second conductor 14 to the length L1 of the first conductor 10 is within a range of 0.36 to 1.2, the gain of the polarization component perpendicular to the substrate surface can be effectively suppressed from decreasing.

[0438] 〔other〕

[0439] In addition, it should be considered that the embodiments disclosed this time are illustrative and non-restrictive in all aspects.

[0440] The scope of the present invention is indicated by the claims rather than the above, and is intended to include all modifications within the scope and meaning equivalent to the claims.

[0441] Description of Reference Numerals

[0442] 1 Antenna

[0443] 1a First side

[0444] 1b Side 2

[0445] 2 Dielectric substrate

[0446] 2a First substrate surface

[0447] 2a1 First Area

[0448] 2a2 Second area

[0449] 2b Second substrate surface

[0450] 2b1 Third Area

[0451] 2b2 Fourth Area

[0452] 4First ground conductor

[0453] 4a margin

[0454] 4b Slit

[0455] 6 Second ground conductor portion

[0456] 8 Feed conductor part

[0457] 8a The first feeder line

[0458] 8a1 Feeding point

[0459] 8a2 The other end

[0460] 8b Second feeder line

[0461] 8b1 end

[0462] 10First conductor part

[0463] 10a end

[0464] 10b Other end

[0465] 10c Middle

[0466] 10c1 Main body

[0467] 10c2 bending part

[0468] 10s1 first side

[0469] 10s2 Side 2

[0470] 12 Short-circuit conductor part

[0471] 14 Second conductor part

[0472] 14a First end

[0473] 14a1 end face

[0474] 14b Second end

[0475] 19 through holes

[0476] 20 Plate-shaped conductor part

[0477] 20a Side 1

[0478] 20b Side 2

[0479] 21 Base end conductor part

[0480] 22 Main body

[0481] 22a one end

[0482] 22b The other end

[0483] 26 First Line

[0484] Line 26a

[0485] 28 Second Line

[0486] 30 holding holes

[0487] 32 through holes

[0488] 34 Second conductor part

[0489] 34a First end

[0490] 34b Second end

[0491] 40 Plate-shaped conductor part

[0492] 40a bending part

[0493] 40b plate-shaped part

[0494] 41 base end conductor part

[0495] 41a Page 1

[0496] 41b Side 2

[0497] 42 Main body

[0498] 42a one end

[0499] 42b The other end

[0500] 43 Insulation adhesive layer

[0501] 46 pads

[0502] 48 through holes

[0503] 50 welding part

[0504] 52 welding part

[0505] 60 holding holes

[0506] 62 through holes

[0507] 64 welding part

[0508] 66 welding part

[0509] D diameter

[0510] L2 distance

[0511] L4 distance

[0512] L5 distance

[0513] L6 distance

[0514] L7 distance

[0515] S signal source

[0516] G5 Line Chart

[0517] G6 Line Chart

[0518] g7 line chart

[0519] 100 inverted F antenna

[0520] 102 Dielectric Substrate

[0521] 104 antenna elements

[0522] 106 Feed conductor part

[0523] 108 short-circuit conductor

[0524] 109 first ground conductor portion

[0525] 110 A second grounding conductor portion.

Claims

1. An antenna comprising: Dielectric substrate; A feed conductor portion, disposed on the dielectric substrate; a linear or strip-shaped first conductor portion, disposed on the substrate surface of the dielectric substrate, connected to the feed conductor portion, and having one end being an open end; and The linear or strip-shaped second conductor portion has a first end portion and a second end portion on the opposite side of the first end portion. The first end portion is connected to a middle portion between two ends of the first conductor portion, The second end is an open end, The second conductor portion protrudes from the intermediate portion.

2. The antenna according to claim 1, wherein: The dielectric substrate has a holding hole into which the first end portion is inserted.

3. The antenna according to claim 2, wherein: The intermediate portion has a through hole into which the first end portion is inserted.

4. The antenna according to claim 1, wherein: The first end portion includes a plate-shaped base conductor portion along the intermediate portion.

5. The antenna according to claim 4, wherein: The antenna further includes an insulating adhesive layer provided between the base conductor portion and the intermediate portion.

6. The antenna according to any one of claims 1 to 5, wherein: The second end portion includes a plate-shaped conductor portion along an intersecting surface intersecting with a longitudinal direction of the second conductor portion.

7. The antenna according to any one of claims 1 to 6, wherein: A ratio of a lengthwise dimension of the second conductor portion to a lengthwise dimension of the first conductor portion is greater than or equal to 0.36 and less than or equal to 1.

2.

8. The antenna according to any one of claims 1 to 7, wherein: The first conductor portion constitutes an inverted-F antenna element.

9. The antenna according to any one of claims 1 to 8, wherein: The first conductor portion forms an inverted L-shaped antenna element.

10. The antenna according to any one of claims 1 to 9, wherein: The first conductor portion has a meander line structure.

Images