broadband antenna

Abstract

A broadband antenna (1) comprises a substrate (70), a ground conductor (72), and a plate-shaped conductor (2). The plate-shaped conductor (2) includes: a first part (10) having a long part (12) along the main surface of the substrate (70); a second part (20) disposed along the main surface of the substrate (70) and connected to the long part (12); a ground part (52) connected to the ground conductor (72); a power supply part (41); and a first capacitance part (31) and a second capacitance part (32) connected to the second part (20), extending from the second part (20) toward the ground conductor (72), and separated from the ground conductor (72). The ground part (52) is connected to one end portion of at least one of the long part (12) and the second part (20) in a first direction. The power supply part (41), the first capacitance part (31), and the second capacitance part (32) are connected to one end portion of the second part (20) in a second direction. The power supply part (41) is disposed between the first capacitance part (31) and the second capacitance part (32).

Description

Technical Field

[0001] The present disclosure relates to a broadband antenna.

Background Art

[0002] In recent years, in addition to information devices such as personal computers, wireless terminals based on standards such as wireless LAN (Local Area Network) have begun to be installed in household appliances such as televisions and audio devices. In order to perform wireless communication in such devices, an antenna for wireless communication is arranged inside the housing of the device. In such an antenna, in order to support wireless communication of a plurality of standards, broadbanding of the resonance frequency band is required (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present disclosure provides a broadband antenna that resonates in a desired frequency band.

Means for Solving the Problems

[0005] A broadband antenna according to one aspect of the present disclosure comprises a substrate, a film-like ground conductor disposed on the main surface of the substrate and connected to ground, and a plate-shaped conductor fixed to the substrate, wherein the plate-shaped conductor has a first portion having an elongated portion separated from the ground conductor and disposed along the main surface of the substrate, a second portion separated from the ground conductor and disposed along the main surface of the substrate and connected to the elongated portion, a ground portion connected to the ground conductor, a power supply portion fixed to the substrate without contacting the ground conductor and connected to the second portion to supply a signal, and a first capacitance portion and a second capacitance portion connected to the second portion, extending from the second portion toward the ground conductor and separated from the ground conductor, and the length of the elongated portion and the second portion When the direction of the hand is defined as the first direction, and the direction intersecting the first direction and along the main surface of the substrate is defined as the second direction, the length of the elongated portion in the first direction is longer than the length of the second portion in the first direction, and in a plan view of the substrate, the elongated portion and the second portion are arranged in the second direction, the ground portion is connected to one end of at least one of the elongated portion and the second portion in the first direction, the power supply portion, the first capacitance portion, and the second capacitance portion are connected to one end of the second portion in the second direction, one end of the elongated portion in the second direction is connected to the other end of the second portion in the second direction, and the power supply portion is positioned between the first capacitance portion and the second capacitance portion in the first direction.

[0006] A broadband antenna according to another aspect of the present disclosure comprises a substrate, a film-like ground conductor disposed on the main surface of the substrate and connected to ground, and a plate-shaped conductor fixed to the substrate, wherein the plate-shaped conductor has a first portion having an elongated portion separated from the ground conductor and disposed along the main surface of the substrate, a second portion separated from the ground conductor and disposed along the main surface of the substrate and connected to the elongated portion, a ground portion connected to the ground conductor, a power supply portion fixed to the substrate without contact with the ground conductor and connected to the second portion and supplied with a signal, and an additional ground portion connected to the ground conductor, wherein the longitudinal direction of the elongated portion and the second portion is the first direction, and the first When the second direction is a direction intersecting the first direction and along the main surface of the substrate, the length of the elongated portion in the first direction is longer than the length of the second portion in the first direction, and in a plan view of the substrate, the elongated portion and the second portion are arranged in the second direction, the ground portion is connected to at least one end of the elongated portion and the second portion in the first direction, the power supply portion is connected to one end of the second portion in the second direction, one end of the elongated portion in the second direction is connected to the other end of the second portion in the second direction, and the additional ground portion is connected to the other end of the elongated portion in the second direction and is separated from the ground portion. [Effects of the Invention]

[0007] According to this disclosure, a broadband antenna that resonates in a desired frequency band can be realized. [Brief explanation of the drawing]

[0008] [Figure 1] This is a first perspective view of a broadband antenna according to Embodiment 1. [Figure 2] This is a second perspective view of a broadband antenna according to Embodiment 1. [Figure 3] This is a plan view of a broadband antenna according to Embodiment 1. [Figure 4]This graph shows the relationship between frequency and voltage standing wave ratio for a broadband antenna according to Embodiment 1. [Figure 5] This is a first perspective view of a broadband antenna according to Embodiment 2. [Figure 6] This is a second perspective view of a broadband antenna according to Embodiment 2. [Modes for carrying out the invention]

[0009] The embodiments will be described in detail below with reference to the drawings.

[0010] The embodiments described below are all general or specific examples. The numerical values, shapes, materials, components, arrangement and connection configurations of components, steps, and the order of steps shown in the following embodiments are examples only and are not intended to limit this disclosure.

[0011] Furthermore, each figure is a schematic diagram and not necessarily a strictly accurate representation. Also, the same component is denoted by the same reference numeral in each figure.

[0012] Furthermore, in this specification, terms indicating relationships between elements such as parallel and perpendicular, terms indicating the shape of elements such as plate-like, and numerical ranges do not represent only strict meanings, but also include substantially equivalent ranges, such as differences of a few percent.

[0013] (Embodiment 1) A broadband antenna according to Embodiment 1 will be described.

[0014] [1-1. Structure] First, the configuration of the broadband antenna according to this embodiment will be explained using Figures 1 to 3. Figures 1, 2, and 3 are the first perspective view, second perspective view, and plan view, respectively, of the broadband antenna 1 according to this embodiment. Figures 1 to 3 show the X, Y, and Z axes, which are perpendicular to each other.

[0015] The broadband antenna 1 according to this embodiment is an antenna that transmits and receives high-frequency signals. The high-frequency signals are not particularly limited, but for example, they are signals in the 2.4GHz band, 5GHz band, 6GHz band, etc., based on wireless LAN standards. In this embodiment, the broadband antenna 1 resonates in the 2.4GHz band, 5GHz band, and 6GHz band. As shown in Figures 1 to 3, the broadband antenna 1 comprises a substrate 70, a ground conductor 72, and a plate-shaped conductor 2. In this embodiment, the broadband antenna 1 further comprises a floating conductor 76.

[0016] The substrate 70 serves as the base for the broadband antenna 1 and is a plate-shaped member having a pair of main surfaces. At least one of the main surfaces of the substrate 70 is made of an insulating material. The ground conductor 72 and the floating conductor 76 are arranged on the main surface 71 of the substrate 70, which is made of an insulating material. As shown in Figures 1 to 3, the main surface 71 is a plane perpendicular to the Z-axis direction. In other words, the main surface 71 is parallel to the X-axis direction and the Y-axis direction. In this embodiment, the substrate 70 is an insulating substrate. The material of the substrate 70 is not particularly limited. For example, a glass epoxy substrate can be used as the substrate 70.

[0017] The ground conductor 72 is a film-like conductor placed on the main surface 71 of the substrate 70 and connected to (i.e., grounded to) the ground. The ground conductor 72 extends along the main surface 71. In other words, the ground conductor 72 extends along the XY plane. The material of the ground conductor 72 is not particularly limited as long as it is a conductor. For example, a copper film placed on the main surface 71 of the substrate 70 can be used as the ground conductor 72.

[0018] The floating conductor 76 is a conductor that is disposed on the main surface 71 of the substrate 70 and is separated from the ground conductor 72. In a state where the plate-like conductor 2 is removed from the substrate 70, the floating conductor 76 is electrically insulated from the ground conductor 72. Note that in a state where the plate-like conductor 2 is attached to the substrate 70, the floating conductor 76 is electrically connected to the ground conductor 72 via the plate-like conductor 2. Thus, in this specification, "separated" means being physically separated (i.e., not in contact), and does not necessarily mean being electrically insulated. The material of the floating conductor 76 is not particularly limited as long as it is a conductor. As the floating conductor 76, for example, a copper film disposed on the main surface 71 of the substrate 70 can be used. Note that the floating conductor 76 and the ground conductor 72 may be formed in the same process. In the present embodiment, the floating conductor 76 is disposed in an island shape within the opening of the ground conductor 72. The floating conductor 76 extends along the main surface 71. In other words, the floating conductor 76 extends along the XY plane.

[0019] The plate-like conductor 2 is a plate-like conductive member fixed to the substrate 70. The plate-like conductor 2 is constituted by, for example, a bent plate-like metal member. The plate-like conductor 2 has a first portion 10, a second portion 20, a ground portion 52, and a power supply portion 41, and functions as an inverted F antenna. In the present embodiment, the plate-like conductor 2 further has a first capacitance portion 31, a second capacitance portion 32, and an additional ground portion 54. The first portion 10, the second portion 20, the ground portion 52, the power supply portion 41, the first capacitance portion 31, the second capacitance portion 32, and the additional ground portion 54 of the plate-like conductor 2 are electrically connected to each other.

[0020] The first portion 10 has a first flat portion 11 that is separated from the ground conductor 72 and is disposed along the main surface 71 of the substrate 70. In the present embodiment, the first portion 10 is disposed parallel to the XY plane. The first portion 10 is disposed at a predetermined distance greater than 0 from the ground conductor 72. The first portion 10 is electrically connected to the ground conductor 72 via the ground portion 52 and the additional ground portion 54.

[0021] The first flat portion 11 has an elongated portion 12 and a bent portion 14. In this embodiment, each of the elongated portion 12 and the bent portion 14 is a plate-like portion arranged parallel to the main surface 71 of the substrate 70. In the following, the longitudinal direction of the elongated portion 12 (and the second portion 20) is referred to as the first direction, and the direction intersecting the first direction and along the main surface 71 of the substrate 70 is referred to as the second direction. In this embodiment, the first direction is perpendicular to the second direction. In each figure, the first direction corresponds to the X-axis direction, and the second direction corresponds to the Y-axis direction. The length of the elongated portion 12 in the first direction is longer than the length of the second portion 20 in the first direction.

[0022] In this embodiment, the gland portion 52 is connected to one end of the elongated portion 12 in the first direction (in other words, the positive end in the X-axis direction).

[0023] The bent portion 14 is located at the other end of the elongated portion 12 in the first direction (in other words, the negative end in the X-axis direction) and extends in the second direction. The bent portion 14 is a plate-like portion located parallel to the main surface 71 of the substrate 70 (i.e., parallel to the XY plane). The bent portion 14 is separated from the second portion 20. In other words, a slit is formed between the bent portion 14 and the second portion 20 (specifically, the second flat portion 22 described later). The bent portion 14 is electrically connected to the second portion 20 via the elongated portion 12.

[0024] The first part 10 has a fixing portion 16 that is fixed to the substrate 70 without contacting the ground conductor 72. At least a portion of the fixing portion 16 extends in a direction intersecting the main surface 71 of the substrate 70 (i.e., in a direction intersecting the XY plane). In this embodiment, the fixing portion 16 has a portion that extends in the Z-axis direction and a portion that extends on the main surface 71 of the substrate 70 in a direction parallel to the main surface 71 of the substrate 70 (i.e., in a direction parallel to the XY plane). The portion of the fixing portion 16 that extends in a direction parallel to the main surface 71 of the substrate 70 is arranged on the floating conductor 76. The fixing portion 16 and the floating conductor 76 are joined by a conductive bonding member such as solder. The manner in which the fixing portion 16 is fixed to the substrate 70 is not limited to this. For example, the fixing portion 16 does not have to have a portion that extends in a direction parallel to the main surface 71 of the substrate 70. The portion of the fixing portion 16 that extends in a direction intersecting the main surface 71 of the substrate 70 (in this embodiment, the Z-axis direction) may be fixed to the substrate 70. In this case, for example, a through hole for inserting the fixing portion 16 may be provided at a position corresponding to the fixing portion 16 of the substrate 70, and the fixing portion 16 and the substrate 70 may be fixed using a bonding material such as solder. The portion of the fixing portion 16 that extends in a direction intersecting the main surface 71 of the substrate 70 (in this embodiment, the Z-axis direction) is the end of the bent portion 14 in the first direction and is connected to the end furthest from the second portion 20.

[0025] The second part 20 is separated from the ground conductor 72, positioned along the main surface 71 of the substrate 70, and connected to the elongated part 12. In this embodiment, the second part 20 is positioned along the X-axis direction. The second part 20 is positioned such that its longitudinal direction coincides with the first direction. As shown in Figure 3, in a plan view of the substrate 70, the elongated part 12 and the second part 20 are arranged in the second direction. The power supply unit 41, the first capacitance unit 31, and the second capacitance unit 32 are connected to one end of the second part 20 in the second direction. The other end of the second part 20 in the second direction is connected to one end of the elongated part 12 in the second direction. Thus, the second part 20, the elongated part 12, the power supply unit 41, the first capacitance unit 31, and the second capacitance unit 32 are electrically connected to each other. Furthermore, the second part 20 is electrically connected to the ground conductor 72 via the long section 12, the ground section 52, and the additional ground section 54 of the first part 10.

[0026] In this embodiment, as shown in Figures 1 to 3, the second part 20 has a second flat part 22 and a connecting part 24. The second flat part 22 is positioned closer to the substrate 70 than the elongated part 12. The second flat part 22 is a plate-like part positioned parallel to the main surface 71 of the substrate 70 (i.e., parallel to the XY plane). The power supply part 41, the first capacitance part 31, and the second capacitance part 32 are connected to one end of the second flat part 22 in the second direction. In this embodiment, the power supply part 41, the first capacitance part 31, and the second capacitance part 32 are connected to the positive end of the second flat part 22 in the Y-axis direction. The connecting part 24 is connected to the other end of the second flat part 22 in the second direction. In this embodiment, the connecting part 24 is connected to the negative end of the second flat part 22 in the Y-axis direction. A slit is formed between the second flat part 22 and the bent part 14 of the first flat part 11.

[0027] The connecting portion 24 connects the second flat portion 22 and the elongated portion 12 of the first portion 10. As a result, the second flat portion 22, the connecting portion 24, and the elongated portion 12 are electrically connected to each other. In this embodiment, the connecting portion 24 extends in a direction intersecting the main surface 71 of the substrate 70. More specifically, the connecting portion 24 extends in a direction perpendicular to the main surface 71 of the substrate 70 (i.e., in the Z-axis direction).

[0028] The ground portion 52 is connected to the ground conductor 72. The ground portion 52 is connected to one end in the first direction of at least one of the elongated portion 12 and the second portion 20. In this embodiment, the ground portion 52 is connected to one end in the first direction of the elongated portion 12. More specifically, the ground portion 52 is connected to the positive end of the elongated portion 12 in the X-axis direction. The ground portion 52 extends in a direction intersecting the main surface 71 of the substrate 70. More specifically, the ground portion 52 extends in a direction perpendicular to the main surface 71 of the substrate 70 (i.e., the Z-axis direction) and in a second direction. The ground portion 52 and the ground conductor 72 are joined by a conductive bonding member, such as solder.

[0029] The additional ground portion 54 is connected to the ground conductor 72. The additional ground portion 54 is connected to the other end of the elongated portion 12 in the second direction (i.e., the end opposite to the end connected to the second portion 20) and is separated from the ground portion 52. The additional ground portion 54 is electrically connected to the ground portion 52 via the elongated portion 12 of the first portion 10. In the plate-shaped conductor 2 according to this embodiment, the power supply portion 41 is located at one end of the plate-shaped conductor 2 in the second direction, and the additional ground portion 54 is located at the other end of the plate-shaped conductor 2 in the second direction. The additional ground portion 54 extends in a direction intersecting the main surface 71 of the substrate 70. In other words, the additional ground portion 54 extends in a direction intersecting the XY plane. More specifically, the additional ground portion 54 extends in a direction perpendicular to the main surface 71 of the substrate 70 (i.e., the Z-axis direction) and in the first direction. The additional ground section 54 and the ground conductor 72 are joined together by a conductive bonding member, such as solder.

[0030] The first capacitance section 31 and the second capacitance section 32 are connected to the second section 20, extend from the second section 20 toward the ground conductor 72, and are separated from the ground conductor 72. The first capacitance section 31 and the second capacitance section 32 extend in a direction intersecting the main surface 71 of the substrate 70 (i.e., in a direction intersecting the XY plane). In this embodiment, the first capacitance section 31 and the second capacitance section 32 extend in a direction perpendicular to the main surface 71 of the substrate 70 (i.e., in the Z-axis direction). The first capacitance section 31 and the second capacitance section 32 are connected to one end of the second section 20 in a second direction. More specifically, the first capacitance section 31 and the second capacitance section 32 are connected to the positive end of the second section 20 in the Y-axis direction. The first capacitance section 31 and the second capacitance section 32 are arranged in a first direction. In the first direction, a power supply section 41 is positioned between the first capacitance section 31 and the second capacitance section 32. The first capacitance section 31 and the second capacitance section 32 are connected to the power supply section 41 at their ends in the first direction. More specifically, the first capacitance section 31 is connected to the positive end of the power supply section 41 in the X-axis direction at its negative end in the X-axis direction, and the second capacitance section 32 is connected to the negative end of the power supply section 41 in the X-axis direction at its positive end in the X-axis direction.

[0031] In this embodiment, the distance between the first capacitance section 31 and the ground conductor 72 is different from the distance between the second capacitance section 32 and the ground conductor 72. More specifically, the distance between the first capacitance section 31 and the ground conductor 72 is smaller than the distance between the second capacitance section 32 and the ground conductor 72. In other words, the dimension of the first capacitance section 31 in the Z-axis direction is larger than the dimension of the second capacitance section 32 in the Z-axis direction.

[0032] In this embodiment, the dimensions of the first capacity section 31 and the second capacity section 32 in the first direction are different. More specifically, the dimension of the first capacity section 31 in the first direction is smaller than the dimension of the second capacity section 32 in the first direction.

[0033] The power supply unit 41 is fixed to the substrate 70 without contacting the ground conductor 72 and is connected to the second part 20, to which a signal (high-frequency signal) is supplied. The power supply unit 41 is positioned, for example, at an opening in the ground conductor 72 and is spaced away from the ground conductor 72. The power supply unit 41 is supplied with a signal from, for example, the main surface 71 on the back side of the main surface 71 of the substrate 70 where the ground conductor 72 is located, via a through electrode (in other words, a via hole electrode). The power supply unit 41 and the through electrode are joined by a conductive bonding member, for example, solder. The power supply unit 41 is electrically connected to the ground conductor 72 via the second part 20, the elongated part 12, the ground part 52, and the additional ground part 54.

[0034] In this embodiment, the power supply unit 41 is connected to one end of the second part 20 in the second direction. In other words, the power supply unit 41 is connected to the end of the second part 20 in the second direction that is opposite to the end to which the elongated part 12 is connected. At least a portion of the power supply unit 41 extends in a direction intersecting the main surface 71 of the substrate 70 (i.e., in a direction intersecting the XY plane). In this embodiment, the power supply unit 41 has a portion that extends in a direction perpendicular to the main surface 71 of the substrate 70 (i.e., in the Z-axis direction) and a portion connected to that portion that extends on the main surface 71 of the substrate 70 in a direction parallel to the main surface 71 of the substrate 70 (i.e., in a direction parallel to the XY plane). The portion of the power supply unit 41 that extends in a direction parallel to the main surface 71 of the substrate 70 is fixed to the substrate 70. The power supply unit 41 does not necessarily have to have a portion extending in a direction parallel to the main surface 71 of the substrate 70. The portion of the power supply unit 41 extending in a direction intersecting the main surface 71 of the substrate 70 (in this embodiment, the Z-axis direction) may be fixed to the substrate 70. In this case, for example, a through hole for inserting the power supply unit 41 may be provided at a position on the substrate 70 corresponding to the power supply unit 41, and the fixing part 16 and the substrate 70 may be fixed using a bonding material such as solder. The power supply unit 41 is positioned between the first capacitance unit 31 and the second capacitance unit 32 in the first direction. One end of the power supply unit 41 in the first direction is connected to the first capacitance unit 31, and the other end is connected to the second capacitance unit 32. In this embodiment, the positive end of the power supply unit 41 in the X-axis direction is connected to the first capacitance unit 31, and the negative end in the X-axis direction is connected to the second capacitance unit 32.

[0035] [1-2. Effects] The effects of the broadband antenna 1 according to this embodiment will be explained using Figure 4. Figure 4 is a graph showing the relationship between the frequency and the voltage standing wave ratio (VSWR) of the broadband antenna 1 according to this embodiment.

[0036] The broadband antenna 1 according to the first embodiment comprises a substrate 70, a film-like ground conductor 72 disposed on the main surface 71 of the substrate 70 and connected to the ground, and a plate-shaped conductor 2 fixed to the substrate 70. The plate-shaped conductor 2 has a first part 10 having an elongated portion 12 that is separated from the ground conductor 72 and disposed along the main surface 71 of the substrate 70, a second part 20 that is separated from the ground conductor 72 and disposed along the main surface 71 of the substrate 70 and connected to the elongated portion 12, a ground portion 52 connected to the ground conductor 72, a power supply portion 41 that is fixed to the substrate 70 without contacting the ground conductor 72 and connected to the second part 20 and to which a signal is supplied, and a first capacitance portion 31 and a second capacitance portion 32 that are connected to the second part 20, extend from the second part 20 toward the ground conductor 72 and are separated from the ground conductor 72. If the longitudinal direction of the long section 12 and the second section 20 is defined as the first direction, and the direction intersecting the first direction and along the main surface 71 of the substrate 70 is defined as the second direction, then the length of the long section 12 in the first direction is longer than the length of the second section 20 in the first direction. In a plan view of the substrate 70, the long section 12 and the second section 20 are arranged in the second direction. The ground section 52 is connected to one end of at least one of the long section 12 and the second section 20 in the first direction. The power supply section 41, the first capacitance section 31, and the second capacitance section 32 are connected to one end of the second section 20 in the second direction, and one end of the long section 12 in the second direction is connected to the other end of the second section 20 in the second direction. The power supply section 41 is positioned between the first capacitance section 31 and the second capacitance section 32 in the first direction.

[0037] Thus, in the broadband antenna 1 according to the first embodiment, a first capacitance section 31 and a second capacitance section 32 are arranged on either side of the feed section 41 in the first direction, forming capacitance with the ground conductor 72.

[0038] Here, the effects of the broadband antenna 1 according to the first embodiment will be explained while comparing the comparative example antenna with the broadband antenna 1 according to the first embodiment. The comparative example antenna differs from the broadband antenna 1 according to the first embodiment in that it does not have a first capacitance section 31 and a second capacitance section 32, but is the same in other respects. In the comparative example antenna, the VSWR is reduced in only two frequency bands: a narrow frequency band that resonates mainly in the first section 10 and a narrow frequency band that resonates mainly in the second section 20.

[0039] On the other hand, the broadband antenna 1 according to the first embodiment can broaden the resonant frequency band by including a first capacitance section 31 and a second capacitance section 32. In particular, it can broaden the resonant frequency band mainly in the second section 20. Specifically, as shown in Figure 4, the broadband antenna 1 according to the first embodiment can reduce the VSWR in the 2.4 GHz band, mainly in the first section 10, and in the frequency band from about 5 GHz to about 8 GHz, mainly in the second section 20. Thus, the broadband antenna 1 according to the first embodiment can realize an antenna that resonates in a desired frequency band. The broadband antenna 1 can transmit and receive signals in the 2.4 GHz, 5 GHz, and 6 GHz bands used in wireless LAN standards, for example.

[0040] The broadband antenna 1 according to the second embodiment comprises a substrate 70, a film-like ground conductor 72 disposed on the main surface 71 of the substrate 70 and connected to the ground, and a plate-shaped conductor 2 fixed to the substrate 70. The plate-shaped conductor 2 has a first part 10 having an elongated portion 12 that is separated from the ground conductor 72 and disposed along the main surface 71 of the substrate 70, a second part 20 that is separated from the ground conductor 72 and disposed along the main surface 71 of the substrate 70 and connected to the elongated portion 12, a ground portion 52 connected to the ground conductor 72, a power supply portion 41 that is fixed to the substrate 70 without contacting the ground conductor 72 and connected to the second part 20 and to which a signal is supplied, and an additional ground portion 54 connected to the ground conductor 72. When the longitudinal direction of the long section 12 and the second section 20 is defined as the first direction, and the direction intersecting the first direction and along the main surface 71 of the substrate 70 is defined as the second direction, the length of the long section 12 in the first direction is longer than the length of the second section 20 in the first direction. In a plan view of the substrate 70, the long section 12 and the second section 20 are arranged in the second direction, and the ground section 52 is connected to at least one end of the long section 12 and the second section 20 in the first direction. The power supply section 41 is connected to one end of the second section 20 in the second direction. One end of the long section 12 in the second direction is connected to the other end of the second section 20 in the second direction. The additional ground section 54 is connected to the other end of the long section 12 in the second direction and is separated from the ground section 52.

[0041] In the broadband antenna 1 according to the second embodiment, the resonant frequency band of the broadband antenna 1 can be easily controlled by providing an additional ground section 54. Specifically, by changing the position of the additional ground section 54 in the first direction, the frequency band that resonates mainly in the first section 10 can be shifted. For example, by moving the position of the additional ground section 54 in the first direction closer to the ground section 52, the frequency band that resonates mainly in the first section 10 can be shifted to the lower frequency side. Conversely, by moving the position of the additional ground section 54 in the first direction further away from the ground section 52, the frequency band that resonates mainly in the first section 10 can be shifted to the higher frequency side.

[0042] Aside from using the additional ground section 54, it is also possible to adjust the frequency band that resonates mainly in the first section 10. For example, the frequency band that resonates mainly in the first section 10 can be adjusted by adjusting the length of the long section 12 in the first direction. However, with this adjustment method, the adjustment of the length of the long section 12 also affects the frequency band that resonates mainly in the second section 20, making adjustment difficult.

[0043] In contrast, in the broadband antenna 1 according to the second embodiment, even if the position of the additional ground section 54 in the first direction is changed, the frequency band that resonates mainly in the second section 20 is hardly affected. In other words, by changing the position of the additional ground section 54 in the first direction, it is possible to selectively shift only the frequency band that resonates mainly in the first section 10. Thus, in the broadband antenna 1 according to the second embodiment, an antenna that resonates in a desired frequency band can be easily realized.

[0044] In the third embodiment of the broadband antenna 1, in the first embodiment, the distance between the first capacitance section 31 and the ground conductor 72 is different from the distance between the second capacitance section 32 and the ground conductor 72.

[0045] This allows for adjustment of the resonant frequency band, primarily in Part 2, section 20.

[0046] In the fourth embodiment, the broadband antenna 1, in either the first or third embodiment, has an additional ground portion 54 connected to the ground conductor 72, the plate-shaped conductor 2 having an additional ground portion 54 connected to the other end of the elongated portion 12 in the second direction and separated from the ground portion 52.

[0047] This provides the same effect as the broadband antenna 1 according to the second embodiment.

[0048] The broadband antenna 1 according to the fifth embodiment, in any of the first to fourth embodiments, has a second part 20 which includes a second flat part 22 positioned closer to the substrate 70 than the elongated part 12, and a connecting part 24 which connects the second flat part 22 and the elongated part 12.

[0049] Such a step difference between the elongated portion 12 of the first part 10 and the second flat portion 22 of the second part 20 can be used to adjust the characteristics of the broadband antenna 1.

[0050] The broadband antenna 1 according to the sixth embodiment, in any of the first to fifth embodiments, has a first part 10 which has a fixing part 16 that is fixed to the substrate 70 without contacting the ground conductor 72, and at least a part of the fixing part 16 extends in a direction intersecting the main surface 71 of the substrate 70.

[0051] This allows the plate-shaped conductor 2 to be fixed to the substrate 70 by the power supply section 41, the ground section 52, and the fixing section 16. Therefore, the plate-shaped conductor 2 can be fixed to the substrate 70 even more firmly. Furthermore, since the fixing section 16 also functions as part of the inverted F antenna, the electrical length of the first section 10 can be increased while suppressing an increase in the size of the first section 10 in the first direction. In other words, resonance in the low-frequency band can be achieved while suppressing an increase in the size of the plate-shaped conductor 2 in the first direction.

[0052] The broadband antenna 1 according to the seventh embodiment, in any of the first to sixth embodiments, has a first part 10 that is located at the other end in the first direction, extends in the second direction, and has a bent part 14 that is separated from the second part 20.

[0053] This makes it possible to increase the electrical length of the first part 10 while suppressing an increase in the size of the first part 10 in the first direction. In other words, it is possible to achieve resonance in the low-frequency band while suppressing an increase in the size of the plate-shaped conductor 2 in the first direction.

[0054] The broadband antenna 1 according to the eighth embodiment resonates in the 2.4GHz band, the 5GHz band, and the 6GHz band in any of the first to seventh embodiments.

[0055] This allows, for example, the use of a wideband antenna 1 for transmitting and receiving signals used in wireless LAN standards.

[0056] (Embodiment 2) A broadband antenna according to Embodiment 2 will now be described. The broadband antenna according to this embodiment differs from the broadband antenna 1 according to Embodiment 1 in the configuration of Part 2. Hereinafter, the broadband antenna according to this embodiment will be described using Figures 5 and 6, focusing on the differences from the broadband antenna 1 according to Embodiment 1. Figures 5 and 6 are the first perspective view and the second perspective view, respectively, of the broadband antenna 101 according to this embodiment. In Figures 5 and 6, the X, Y, and Z axes are shown perpendicular to each other, similar to Figures 1 to 3.

[0057] The broadband antenna 101 according to this embodiment comprises a substrate 70, a ground conductor 72, and a plate-shaped conductor 102. In this embodiment, the broadband antenna 101 further comprises a floating conductor 76.

[0058] The plate-shaped conductor 102 is a plate-shaped conductive member fixed to the substrate 70. The plate-shaped conductor 102 is made of, for example, a bent plate-shaped metal member. The plate-shaped conductor 102 has a first part 10, a second part 120, a ground part 52, and a feed part 41, and functions as an inverted F antenna. In this embodiment, the plate-shaped conductor 102 further has a first capacitance part 31, a second capacitance part 32, and an additional ground part 54.

[0059] The second part 120 in this embodiment, like the second part 20 in the first embodiment, is separated from the ground conductor 72, arranged along the main surface 71 of the substrate 70, and connected to the elongated part 12. The second part 120 is arranged so that its longitudinal direction coincides with the first direction.

[0060] In this embodiment, no step is formed between the elongated portion 12 of the first portion 10 and the second portion 120. In other words, the upper surfaces (the surfaces furthest from the substrate 70) of the elongated portion 12 and the second portion 120 are connected so as to be flush. To put it another way, the second portion 120 is a plate-like portion arranged parallel to the main surface 71 of the substrate 70 (i.e., parallel to the XY plane), and the distance of the second portion 120 to the substrate 70 is substantially equal to the distance of the first portion 10 to the substrate 70.

[0061] Even in a broadband antenna 101 equipped with such a plate-shaped conductor 102, the same effects as the broadband antenna 1 according to Embodiment 1 are achieved.

[0062] (Torture, etc.) The broadband antennas of this disclosure have been described above based on various embodiments, but this disclosure is not limited to the above embodiments. Various modifications to the above embodiments that a person skilled in the art can conceive of may also be included within the scope of this disclosure, as long as they do not deviate from the spirit of this disclosure.

[0063] For example, in each of the above embodiments, the ground section 52 is connected to the elongated section 12 of the first section 10, but the configuration of the ground section 52 is not limited to this. For example, the ground section 52 may be connected to the second section 20 or the second section 120, or it may be connected to both the first section 10 and the second section 20 (or the second section 120).

[0064] Furthermore, in each of the above embodiments, the first part 10 has a bent portion 14 and a fixed portion 16, but it is not necessary to have at least one of the bent portion 14 and the fixed portion 16.

[0065] Furthermore, in each of the above embodiments, the distance between the first capacitance section 31 and the ground conductor 72 was smaller than the distance between the second capacitance section 32 and the ground conductor 72, but it may be larger or equal to the distance between the two. Also, in each of the above embodiments, the dimension of the first capacitance section 31 in the first direction was smaller than the dimension of the second capacitance section 32 in the first direction, but it may be larger or equal to the distance between the two.

[0066] Furthermore, although the plate-shaped conductor in each of the above embodiments has an additional ground portion 54, it does not have to have an additional ground portion 54.

[0067] Furthermore, in each of the above embodiments, the plate-shaped conductor had a first capacitance portion 31 and a second capacitance portion 32, but the plate-shaped conductor does not have to have at least one of the first capacitance portion 31 and the second capacitance portion 32.

[0068] Furthermore, this disclosure also includes forms that can be realized by arbitrarily combining the components and functions of each embodiment, without departing from the spirit of this disclosure. [Industrial applicability]

[0069] The broadband antenna of this disclosure can be used, for example, as an antenna for wireless communication in devices such as personal computers and television receivers. [Explanation of Symbols]

[0070] 1. 101 Broadband Antenna 2, 102 Plate-shaped conductor 10 Part 1 11 1st flat part 12 Long section 14. Bending section 16 Fixed part 20, 120 Part 2 22 2nd flat part 24 Connection part 31 1st capacity section 32 2nd capacity section 41 Power supply section 52. Grounds Department 54 Additional Ground Section 70 circuit boards 71 Main surface 72 Ground Conductor 76 Floating Conductor

Claims

1. circuit board and A film-like ground conductor is arranged on the main surface of the substrate and connected to the ground, The substrate comprises a plate-shaped conductor fixed to the substrate, The aforementioned plate-shaped conductor is A first part having an elongated portion that is separated from the ground conductor and arranged along the main surface of the substrate, A second part is separated from the ground conductor, arranged along the main surface of the substrate, and connected to the elongated portion, The ground portion connected to the aforementioned ground conductor, A power supply unit is fixed to the substrate without contacting the ground conductor and connected to the second part, and to which a signal is supplied, It has a first capacitance portion and a second capacitance portion connected to the second portion, extending from the second portion toward the ground conductor and separated from the ground conductor, When the longitudinal direction of the long portion and the second portion is defined as the first direction, and the direction intersecting the first direction and along the main surface of the substrate is defined as the second direction, The length of the long portion in the first direction is longer than the length of the second portion in the first direction. In a plan view of the substrate, the elongated portion and the second portion are arranged in the second direction. The ground portion is connected to one end of at least one of the elongated portion and the second portion in the first direction. The power supply unit, the first capacitance unit, and the second capacitance unit are connected to one end of the second part in the second direction. One end of the elongated portion in the second direction is connected to the other end of the second portion in the second direction. The power supply unit is positioned between the first capacity unit and the second capacity unit in the first direction. A broadband antenna.

2. The plate-shaped conductor has an additional ground portion connected to the ground conductor, The additional ground portion is connected to the other end of the elongated portion in the second direction and is separated from the ground portion. The broadband antenna according to claim 1.

3. The second part comprises a flat portion positioned closer to the substrate than the elongated portion, It has a connecting portion that connects the flat portion and the elongated portion. A broadband antenna according to claim 1 or 2.

4. The first part has a fixing portion that is fixed to the substrate without contacting the ground conductor, At least a portion of the fixing portion extends in a direction intersecting the main surface of the substrate. A broadband antenna according to claim 1 or 2.

5. The first part has a bent portion located at the other end in the first direction, extending in the second direction and separated from the second part. A broadband antenna according to claim 1 or 2.

6. The distance between the first capacitance unit and the ground conductor is different from the distance between the second capacitance unit and the ground conductor. A broadband antenna according to claim 1 or 2.

7. The aforementioned broadband antenna resonates in the 2.4 GHz band, the 5 GHz band, and the 6 GHz band. A broadband antenna according to claim 1 or 2.

8. circuit board and A film-like ground conductor is arranged on the main surface of the substrate and connected to the ground, The substrate comprises a plate-shaped conductor fixed to the substrate, The aforementioned plate-shaped conductor is A first part having an elongated portion that is separated from the ground conductor and arranged along the main surface of the substrate, A second part is separated from the ground conductor, arranged along the main surface of the substrate, and connected to the elongated portion, The ground portion connected to the aforementioned ground conductor, A power supply unit is fixed to the substrate without contacting the ground conductor and connected to the second part, and to which a signal is supplied, It has an additional ground section connected to the aforementioned ground conductor, When the longitudinal direction of the long portion and the second portion is defined as the first direction, and the direction intersecting the first direction and along the main surface of the substrate is defined as the second direction, The length of the long portion in the first direction is longer than the length of the second portion in the first direction. In a plan view of the substrate, the elongated portion and the second portion are arranged in the second direction. The ground portion is connected to at least one end of the elongated portion and the second portion in the first direction, The power supply unit is connected to one end of the second part in the second direction, One end of the elongated portion in the second direction is connected to the other end of the second portion in the second direction. The additional ground portion is connected to the other end of the elongated portion in the second direction and is separated from the ground portion. A broadband antenna.

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