Multiple Resonance Antenna

Abstract

To provide an antenna having a structure that resonates at multiple operating frequencies.SOLUTION: A double resonant antenna has a main antenna 30 and an additional radiating element 230. The main antenna 30 has a main section 252, 320 that constitutes a split ring and a feeding section 210 that branches off from the main section 252, 320 and constitutes a first resonant section. The additional radiating element 230 extends from the main antenna 30 toward the outside of the main antenna 30. The additional radiating element 230 constitutes at least a part of the second resonant section, which is different from the first resonant section.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to Multiple Resonance Antenna Regarding. [Background technology]

[0002] Patent Document 1 discloses a small-sized wideband antenna 900. Figure 8 As shown in FIG. 1, an antenna 900 of Patent Document 1 has a split ring resonator 910 using a split ring 920 that is a ring-shaped conductor having a split portion 922. Specifically, the antenna 900 of Patent Document 1 has a main portion 930 that constitutes the split ring 920, and a power feed portion 940. Here, the power feed portion 940 is provided in the main portion 930. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6020451 Summary of the Invention [Problem to be solved by the invention]

[0004] The antenna 900 of Patent Document 1 operates at the resonant frequency of the split ring resonator 910. That is, the antenna 900 of Patent Document 1 resonates only at a single operating frequency and cannot support a wide frequency band.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS It is therefore an object of the present invention to provide an antenna having a structure that resonates at multiple operating frequencies. [Means for solving the problem]

[0006] The present invention provides a multiple resonance antenna having a main antenna and an additional radiating element as a first multiple resonance antenna, The main antenna constitutes a first resonating portion, The main antenna includes a main portion forming a split ring and a power supply portion provided so as to branch off from the main portion, the additional radiating element extends from the main antenna toward an outside of the main antenna; The additional radiating element constitutes at least a part of a second resonating section different from the first resonating section. A multiple resonance antenna is provided.

[0007] Further, the present invention provides a second multiple resonance antenna, which is a first multiple resonance antenna, The multiple resonance antenna includes a substrate, the substrate has a ground pattern, The additional radiating element does not overlap with the ground pattern when viewed from above. A multiple resonance antenna is provided.

[0008] Further, the present invention provides a third multiple resonance antenna, which is the second multiple resonance antenna, The additional radiating element has a first extension portion extending in a first predetermined direction, The ground pattern has a second extension portion located away from the first extension portion in a second direction perpendicular to the first direction and extending in the first direction. A multiple resonance antenna is provided.

[0009] Furthermore, the present invention provides a fourth multiple resonance antenna, which is the third multiple resonance antenna, the ground pattern has a third extension portion extending from the second extension portion in the second predetermined direction, A tip end of the first extension portion of the additional radiating element is located away from the third extension portion in the first predetermined direction and faces the third extension portion. A multiple resonance antenna is provided.

[0010] In addition, the present invention provides a fifth multiple resonance antenna, which is any one of the first to fourth multiple resonance antennas, The additional radiating element extends from the main portion of the main antenna. A multiple resonance antenna is provided.

[0011] In addition, the present invention provides a sixth multiple resonance antenna, which is any one of the first to fifth multiple resonance antennas, The multiple resonance antenna includes a substrate, The main portion of the main antenna and the additional radiating element are configured in a pattern on the substrate. A multiple resonance antenna is provided.

[0012] In addition, the present invention provides a seventh multiple resonance antenna, which is any one of the first to fifth multiple resonance antennas, The multiple resonance antenna includes a substrate, The main portion of the main antenna is composed of a pattern on the substrate and a metal member separate from the substrate. A multiple resonance antenna is provided.

[0013] Furthermore, the present invention provides an eighth multiple resonance antenna, which is the seventh multiple resonance antenna, The additional radiating element is configured as a pattern on the substrate. A multiple resonance antenna is provided.

[0014] In addition, the present invention provides a ninth multiple resonance antenna, which is any one of the first to eighth multiple resonance antennas, The body portion has a first end and a second end, the power supply portion branches off from the main portion at a position closer to the first end than to the second end, The additional radiating element extends from the main portion or from the feeding portion at a position closer to the first end than to the second end. A multiple resonance antenna is provided. Effect of the Invention

[0015] The multiple resonance antenna of the present invention includes an additional radiating element that constitutes at least a part of the second resonance section in addition to the main antenna that constitutes the first resonance section. This allows the multiple resonance antenna of the present invention to resonate at both the operating frequency of the first resonance section and the operating frequency of the second resonance section. In other words, the multiple resonance antenna of the present invention has a structure that resonates at a plurality of operating frequencies. [Brief description of the drawings]

[0016] [Figure 1] 1 is a top view showing a multiple resonance antenna according to an embodiment of the present invention, in which an antenna component mounted on a circuit board and its periphery are shown in an enlarged manner. [Diagram 2] 2 is a plan view showing a circuit board included in the multiple resonance antenna of FIG 1, showing an enlarged view of a mounting area for mounting an antenna component and its surroundings. [Diagram 3] 2 is a perspective view showing an antenna component included in the multiple resonance antenna of FIG. 1. [Figure 4] 1. FIG. 4 is a schematic diagram showing a first modified example of the multiple resonance antenna of FIG. [Diagram 5] 1. FIG. 4 is a schematic diagram showing a second modified example of the multiple resonance antenna of FIG. [Figure 6] 1. FIG. 4 is a schematic diagram showing a third modified example of the multiple resonance antenna of FIG. [Figure 7] 1. FIG. 4 is a schematic diagram showing a fourth modified example of the multiple resonance antenna of FIG. [Figure 8] FIG. 1 is a top view showing the antenna described in Patent Document 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] 1, a multiple resonance antenna 10 according to an embodiment of the present invention includes a circuit board (substrate) 20 and an antenna component 32. In this embodiment, the antenna component 32 partially constitutes a main antenna 30.

[0018] As shown in FIG. 2, the circuit board 20 of this embodiment has a conductor pattern (pattern) 200. The conductor pattern 200 includes a power supply section 210, a ground pattern (ground section) 220, and an additional radiating element 230. The conductor pattern 200 also includes a first main section 252 that partially configures the main antenna 30. The first main section 252 is located within a mounting area 250 in which the antenna component 32 is mounted. The pattern shape of the first main section 252 is determined according to desired characteristics. The first main section 252 configures the main antenna 30 together with the antenna component 32 mounted on the circuit board 20. In this way, the multiple resonance antenna 10 of this embodiment includes the main antenna 30 and the additional radiating element 230.

[0019] 1 and 2, the antenna component 32 of the present embodiment is configured with a metal member that is mounted on the circuit board 20 when in use. That is, the antenna component 32 is a discrete component that is mounted on the circuit board 20 when in use. However, the present invention is not limited to this. The antenna component 32 of the present invention may be configured using other methods, such as plating a resin body with a metal film or attaching a metal member to a resin body.

[0020] As can be seen from Figs. 1 and 2, in this embodiment, the main antenna 30 is composed of the antenna component 32 and a part (first main portion 252) of the conductor pattern 200 of the circuit board 20. However, the present invention is not limited to this. The main antenna 30 may be composed of the antenna component 32 alone. Furthermore, the main antenna 30 may be composed of one or more conductive layers included in the circuit board 20. For example, The main antenna 30 is The circuit board 20 may be a multi-layer wiring board having a plurality of conductive layers and a plurality of vias.

[0021] 3, the antenna component 32 of this embodiment includes a second main portion 320, a power feed leg portion 340, and a facing portion 350. The antenna component 32 further includes a plurality of ground portions 370 and a plurality of fixing portions 380. The second main portion 320 constitutes the main portion of the main antenna 30 together with the first main portion 252 of the circuit board 20. In other words, in this embodiment, the main portion of the main antenna 30 is constituted by the first main portion 252 of the circuit board 20 and the second main portion 320 of the antenna component 32.

[0022] As shown in Fig. 3, the shape of the second main portion 320 in this embodiment is a substantially rectangular ring shape that is long in the horizontal direction. However, the present invention is not limited to this. The shape of the second main portion 320 of the present invention may be various ring shapes such as a circular ring shape, an elliptical ring shape, or a polygonal ring shape, as well as a substantially rectangular ring shape. In this embodiment, the horizontal direction is the X direction. In this embodiment, the -X direction may be particularly referred to as the first predetermined direction.

[0023] 3, the second main portion 320 has a first end 322 and a second end 324. The first end 322 and the second end 324 face each other and separate from each other to form a split portion 326. In other words, the second main portion 320 constitutes a split ring having the split portion 326.

[0024] As shown in FIG. 3, the power feed leg 340 is provided so as to branch off from the second main section 320. In this embodiment, the power feed leg 340 branches off from the second main section 320 at a position closer to the first end 322 than the second end 324. The power feed leg 340 extends rearward and then downward. The power feed leg 340 is connected to the power feed section 210 when the main antenna 30 is mounted on the circuit board 20. In this embodiment, the front-rear direction is the Y direction. The +Y direction is the front, and the -Y direction is the rear. In this embodiment, the +Y direction may be particularly referred to as the second predetermined direction. In this embodiment, the up-down direction is the Z direction. The +Z direction is the up, and the -Z direction is the down.

[0025] 3, the facing portion 350 has a first facing portion 352 and a second facing portion 354. The first facing portion 352 and the second facing portion 354 face each other and are spaced apart from each other so as to form a capacitor. The first facing portion 352 and the second facing portion 354 are provided at the first end portion 322 and the second end portion 324 of the second main portion 320, respectively. In this embodiment, the first end portion 322 and the first facing portion 352 are integrally formed. Similarly, the second end portion 324 and the second facing portion 354 are integrally formed.

[0026] As shown in FIG. 3, the first opposing portion 352 has a first upper opposing portion 362 extending rearward from the first end portion 322, and a first lower opposing portion 364 extending forward from the first end portion 322, then extending downward, and further extending rearward. The second opposing portion 354 has a second upper opposing portion 366 extending rearward from the second end portion 324, and a second lower opposing portion 368 extending forward from the second end portion 324, then extending downward, and further extending rearward. However, the present invention is not limited thereto. In the present invention, the first opposing portion 352 and the second opposing portion 354 may be formed to configure a capacitor having desired characteristics, and their shapes and sizes are not particularly limited.

[0027] As can be seen from Fig. 3, the second main portion 320 constitutes an inductance component of the main antenna 30 due to its shape. The first end portion 322 and the second end portion 324, together with the first opposing portion 352 and the second opposing portion 354, constitute a capacitor component of the main antenna 30. With this configuration, the main antenna 30 can operate as an LC resonant circuit (first resonant portion). The LC resonant circuit formed by the main antenna 30 is also called a split ring resonator. In this manner, the main antenna 30 constitutes the first resonant portion.

[0028] 2, the power supply section 210, the ground pattern 220, the additional radiating element 230, and the first main section 252 formed on the circuit board 20 are formed using a single conductive layer (conductor pattern 200). The power supply section 210, the ground pattern 220, the additional radiating element 230, and the first main section 252 are continuous with each other. However, the present invention is not limited to this. The power supply section 210, the ground pattern 220, the additional radiating element 230, and the first main section 252 may be formed using a plurality of conductive layers and vias included in a multilayer wiring board.

[0029] 2, in this embodiment, conductor pattern 200 covers the surface of circuit board 20 except for a predetermined area. Power supply portion 210 is formed in a slit 222 formed in conductor pattern 200. Power supply portion 210 extends in the front-rear direction.

[0030] As can be seen from FIG. 1, the additional radiating element 230 extends outward from the main antenna 30 . For details, see Figure 2 2, the additional radiating element 230 extends from the first main section 252 toward the outside of the main antenna 30. In this embodiment, the additional radiating element 230 has a base section 232 extending from the first main section 252 in a second predetermined direction (+Y direction), and a first extension section 234 extending from the base section 232 in a first predetermined direction (-X direction). However, the present invention is not limited to this. The additional radiating element 230 extends from the first main section 252 toward the outside of the main antenna 30. Prescribed As long as the additional radiating element 230 extends in the direction of the axis of the antenna 30, it does not have to have the base 232. The additional radiating element 230 may extend from the power feeding unit 210 toward the outside of the main antenna 30. In this case, the base 232 may have a shape having a bent portion instead of a straight line. The shape of the first extension 234 of the additional radiating element 230 may have a wide portion at the tip.

[0031] 1, the additional radiating element 230 extends from near the first end 322 and the feed leg 340 of the antenna component 32 in a plan view. The additional radiating element 230 does not overlap with the ground pattern 220 in a plan view. The additional radiating element 230 constitutes at least a part of a second resonating part different from the first resonating part. In detail, the additional radiating element 230 constitutes the second resonating part alone or together with a part of the conductor pattern 200.

[0032] 1 and 2, a clearance area 240 is formed between the first extension part 234 of the additional radiating element 230 and the ground pattern 220. The size of the clearance area 240 is determined in consideration of the characteristics of the main antenna 30 and the characteristics of the additional radiating element 230.

[0033] 2, the ground pattern 220 has a second extension portion 224 and a third extension portion 226 that partially define the clearance region 240. The second extension portion 224 is located away from the first extension portion 234 of the additional radiating element 230 in the front-rear direction, and extends from near the mounting region 250 in a first predetermined direction. The third extension portion 226 extends from the second extension portion 224 in a second predetermined direction.

[0034] As shown in FIGS. 1 and 2, in this embodiment, the tip of the first extension portion 234 of the additional radiating element 230 is separated from and faces the third extension portion 226 in the first predetermined direction.

[0035] The electrical length of the additional radiating element 230 is determined based on ¼ of the wavelength of the desired operating frequency, which is a frequency different from the operating frequency of the main antenna 30.

[0036] In the multiple resonance antenna 10 configured as above, the first resonance portion and the second resonance portion have different operating frequencies. In other words, the multiple resonance antenna 10 of this embodiment is capable of resonating at both the operating frequency of the main antenna 30 and the operating frequency of the additional radiating element 230. The first resonance portion is connected to a resonance source (not shown) via the power supply portion 210. The second resonance portion is connected to the first resonance portion. In this manner, the multiple resonance antenna 10 of the present invention has a structure that resonates at a plurality of operating frequencies.

[0037] More specifically, the multiple resonance antenna 10 of this embodiment has a structure that electrically resonates at two operating frequencies: the operating frequency of the LC resonance circuit operating as the main antenna 30, and the operating frequency of the additional radiating element 230 determined by its electrical length.

[0038] Although the embodiment of the present invention has been described above, the embodiment may be modified as follows.

[0039] (Variation 1) 4, the multiple resonance antenna 10A of the first modified example includes a main antenna 30A and an additional radiating element 230A. The main antenna 30A includes a main portion 320A, a power feeding portion 210A, a ground line portion 342, and an opposing portion 350A. The multiple resonance antenna 10A further includes a substrate (not shown).

[0040] As can be seen from Fig. 4, in the multiple resonance antenna 10A of the first modified example, the main antenna 30A and the additional radiating element 230A are integrally formed. The combination of the main antenna 30A and the additional radiating element 230A may be formed, for example, by a metal member mounted on a substrate (not shown) during use. Alternatively, the combination of the main antenna 30A and the additional radiating element 230A may be formed by a conductor pattern (pattern) formed on the substrate. Alternatively, the combination of the main antenna 30A and the additional radiating element 230A may be formed, in part, by a conductor pattern formed on the substrate, and the remaining part by a metal member separate from the substrate.

[0041] As shown in FIG. 4, the main portion 320A has a first portion 330, a second portion 332, a third portion 334, a fourth portion 336, and a fifth portion 338. The first portion 330 and the second portion 332 each extend along the lateral direction. Prescribed The third portion 334 and the fifth portion 338 each extend in the front-rear direction. The fourth portion 336 extends along the lateral direction. The fourth portion 336 is spaced apart from the first portion 330 and the second portion 332 in the front-rear direction and is disposed parallel to the first portion 330 and the second portion 332. The third portion 334 and the fifth portion 338 each extend in the front-rear direction. The third portion 334 and the fifth portion 338 are spaced apart from each other and disposed parallel to each other.

[0042] As shown in FIG. 4, the first portion 330 and the second portion 332 of the main portion 320A have a first end 322A and a second end 324A, respectively. The first end 322A and the second end 324A face each other at a distance from each other to form a split portion 326A. The third portion 334 of the main portion 320A connects the second portion 332 and the fourth portion 336. The fifth portion 338 of the main portion 320A connects the first portion 330 and the fourth portion 336. Thus, the main portion 320A constitutes a split ring having the split portion 326A. However, the present invention is not limited thereto. The main portion 320A may have a circular or elliptical shape as long as it forms a split ring. etc. The ring may have other annular shapes.

[0043] As shown in FIG. 4, the power supply section 210A branches off from the main section 320A at a position closer to the first end 322A than the second end 324A. The additional radiating element 230A also extends from the main section 320A at a position closer to the first end 322A than the second end 324A. In detail, the power supply section 210A and the additional radiating element 230A each branch off from the first section 330 of the main section 320A. In the lateral direction or the first predetermined direction, the additional radiating element 230A is located farther from the first end 322A than the power supply section 210A. However, the present invention is not limited thereto. Depending on the desired characteristics, the additional radiating element 230A may be located at the same position as the power supply section 210A in the first predetermined direction, or may be located closer to the first end 322A than the power supply section 210A in the first predetermined direction. Additionally, additional radiating element 230A may extend from feed portion 210A rather than main portion 320A, depending on the desired characteristics.

[0044] As shown in FIG. 4, power supply unit 210A extends from first portion 330 to fourth portion 336 of main portion 320A along the front-rear direction. A ground pattern (not shown) is formed on a substrate (not shown), and fourth portion 336 of main portion 320A is electrically connected to the ground pattern. Alternatively, fourth portion 336 of main portion 320A may be a part of the ground pattern. A power supply line or a circuit element (not shown) is connected to an end portion of power supply unit 210A so that the end portion of power supply unit 210A becomes excitation point 40. At least one of third portion 334, fourth portion 336, and fifth portion 338 of main portion 320A may be connected to the ground pattern.

[0045] As shown in FIG. 4, the additional radiating element 230A extends from the main part 320A of the main antenna 30A toward the outside of the main antenna 30A. In detail, the additional radiating element 230A has a base part 232A extending from the first part 330 of the main part 320A in a second predetermined direction, and a first extension part 234A extending from the base part 232A in a first predetermined direction. When the substrate (not shown) has a ground pattern (not shown), the additional radiating element 230A is formed so as not to overlap with the ground pattern when viewed in a plan view. However, the present invention is not limited to this. The additional radiating element 230A only needs to have the first extension part 234A, and may not have the base part 232A. In addition, the shape of the first extension part 234A is not limited to a rectangle, and may have a wide part at its tip. The additional radiating element 230A corresponds to 1 / 4 of the wavelength of the desired operating frequency.

[0046] As shown in FIG. 4, the facing portion 350A has a first facing portion 352A and a second facing portion 354A. The first facing portion 352A and the second facing portion 354A extend in the front-rear direction from the first end portion 322A and the second end portion 324A, respectively. The first facing portion 352A and the second facing portion 354A also extend toward the inside of the main portion 320A. The first facing portion 352A and the second facing portion 354A are arranged parallel to each other at a predetermined distance apart. However, the present invention is not limited to this. The shapes of the first facing portion 352A and the second facing portion 354A are not particularly limited as long as they constitute a capacitor having desired characteristics. In addition, when the main portion 320A is formed by a pattern on a substrate (not shown), the first facing portion 352A and the second facing portion 354A may be formed of a metal member separate from the substrate.

[0047] As can be seen from FIG. 4, in the multiple resonance antenna 10A, the main antenna 30A is fed from an excitation point 40. The additional radiating element 230A is connected to the main antenna 30A. With this configuration, the main antenna 30A operates as a split ring resonator (LC resonant circuit or first resonant section), and the additional radiating element 230A operates as a second resonant section different from the first resonant section. The first resonant section and the second resonant section have different resonant frequencies. In this way, the multiple resonance antenna 10A of the first modified example has a structure that electrically resonates at two operating frequencies, the operating frequency of the main antenna (first resonant section) 30A and the operating frequency of the additional radiating element (second resonant section) 230A.

[0048] (Variation 2) 5, multiple resonance antenna 10B of the second modification includes a second extension portion (ground portion) 224B in addition to the configuration of multiple resonance antenna 10A of the first modification. Since the multiple resonance antenna 10B is the same as multiple resonance antenna 10A of the first modification except for second extension portion 224B, detailed description thereof will be omitted.

[0049] As shown in FIG. 5, the second extension portion 224B extends in a first predetermined direction from one end of the fourth portion 336 of the main portion 320A. In other words, the second extension portion 224B is disposed parallel to the additional radiating element 230A. In the second predetermined direction, the second extension portion 224B is spaced apart from the additional radiating element 230A. When the main antenna 30A is made of a metal member, the second extension portion 224B may be formed integrally with the main antenna 30A by using the metal member. Alternatively, the second extension portion 224B may be formed by bonding the main antenna 30A to a substrate (not shown). of The second extension portion 224B may be configured with a conductor pattern (not shown). The second extension portion 224B may be connected to a ground pattern (not shown) of the substrate, or may be a part of the ground pattern. However, in a plan view, there is no ground pattern between the second extension portion 224B and the additional radiating element 230A.

[0050] As can be seen from Figure 5, the multiple resonance antenna 10B of this modified example also has a structure that electrically resonates at two operating frequencies: the operating frequency of the main antenna (first resonance portion) 30A and the operating frequency of the additional radiating element (second resonance portion) 230A.

[0051] (Variation 3) 6, the multiple resonance antenna 10C of the third modification includes a third extension portion (ground portion) 226C in addition to the configuration of the multiple resonance antenna 10B of the second modification. Since the multiple resonance antenna 10C is the same as the multiple resonance antenna 10B of the second modification except for the third extension portion 226C, detailed description thereof will be omitted.

[0052] As shown in FIG. 6, the third extension 226C extends in the second predetermined direction from one end of the second extension 224B. The third extension 226C does not intersect with the additional radiating element 230A. In particular, the tip of the third extension 226C is separated from the additional radiating element 230A. In this modification, the third extension 226C does not protrude forward from the additional radiating element 230A in the front-rear direction. However, the present invention is not limited to this. The third extension 226C may protrude forward from the additional radiating element 230A in the front-rear direction. In any case, the tip of the additional radiating element 230A is separated from the third extension 226C in the lateral direction or the first predetermined direction and faces the third extension 226C. The third extension 226C may be made of a metal member or a conductor pattern (not shown) of a substrate (not shown). The third extension 226C may be connected to a ground pattern (not shown) of the board, or may be a part of the ground pattern, but there is no ground pattern between the third extension 226C and the additional radiating element 230A in plan view.

[0053] As can be seen from Figure 6, the multiple resonance antenna 10C of this modified example also has a structure that electrically resonates at two operating frequencies: the operating frequency of the main antenna (first resonance portion) 30A and the operating frequency of the additional radiating element (second resonance portion) 230A.

[0054] (Variation 4) As shown in FIG. 7, a multiple resonance antenna 10D of the fourth modified example has a structure similar to that of the multiple resonance antenna 10A of the first modified example. Append The multiple resonance antenna 10D includes an additional radiating element 230D instead of the radiating element 230A. Append Points other than radiating element 230D are the same as multiple resonance antenna 10A of the first modified example, so detailed description thereof will be omitted.

[0055] As shown in FIG. 7, the additional radiating element 230D branches from the second portion 332 of the main portion 320A. The additional radiating element 230D has a base portion 232D extending from the second portion 332 of the main portion 320A in a second predetermined direction, and a first extension portion 234D extending in a direction opposite to the first predetermined direction. The additional radiating element 230D is formed to correspond to ¼ of the wavelength of the desired operating frequency. If the substrate (not shown) has a ground pattern (not shown), the additional radiating element 230D is formed so as not to overlap with the ground pattern when viewed in a plan view. However, the present invention is not limited to this. The additional radiating element 230D only needs to have the first extension portion 234D, and may not have the base portion 232D. In addition, the shape of the first extension portion 234D is not limited to a rectangle, and may have a wide portion at its tip. Furthermore, an extension portion corresponding to the second extension portion 224B shown in Fig. 5 may be further added to the multiple resonance antenna 10D of Fig. 7. Furthermore, or alternatively, two extension portions corresponding to the second extension portion 224B and the third extension portion 226C shown in Fig. 6 may be further added to the multiple resonance antenna 10D of Fig. 7.

[0056] As can be seen from FIG. 7, the multiple resonance antenna 10D of this modified example also has an operating frequency of the main antenna (first resonance portion) 30A and an additional radiating element (second resonance portion) 230D The structure has electrical resonance at two operating frequencies:

[0057] Although the present invention has been specifically described above with reference to the embodiment, the present invention is not limited to this and various modifications are possible. [Explanation of symbols]

[0058] 10, 10A, 10B, 10C, 10D Multi-resonant antenna 20 Circuit board (substrate) 200 Conductor pattern (pattern) 210,210A power supply 220 Ground pattern (ground section) 222 Slit 224, 224B Second extension part (ground part) 226, 226C Third extension section (ground section) 230, 230A Additional radiating element (second resonator) 232,232A Base 234,234A 1st extension section 240 Clearance Area 250 loading area 252 First Main Section 30, 30A, 30B, 30C, 30D Main antenna (first resonator) 32 Antenna parts 320 Second main part (split ring) 320A Main section (split ring) 322,322A 1st end 324,324A 2nd end 326 Split Section 330 Part 1 332 Part 2 334 Part 3 336 Part 4 338 Part 5 340 Power Feeder 350,350A Opposite part 352,352A 1st opposing part 362 First upper opposing part 364 1st lower opposing part 354,354A 2nd opposing part 366 Second upper opposing part 368 2nd lower opposing part 370 Grounding part 380 Fixed part 40 Excitation points

Claims

1. A multiple resonance antenna comprising a main antenna and an additional radiating element, The main antenna includes a main portion forming a split ring and a power supply portion provided so as to branch off from the main portion, the additional radiating element extends from the main antenna toward an outside of the main antenna; The multiple resonance antenna includes a ground portion, the additional radiating element does not overlap with the ground portion when viewed in a plan view, The additional radiating element has a first extension portion extending in a first predetermined direction, the ground portion has a second extension portion that is located away from the first extension portion in a second predetermined direction perpendicular to the first predetermined direction and extends in the first predetermined direction, the ground portion has a third extension portion extending from the second extension portion in the second predetermined direction, A tip end of the first extension portion of the additional radiating element is located away from the third extension portion in the first predetermined direction and faces the third extension portion. Multiple resonance antenna.

2. 2. The multiple resonance antenna according to claim 1, The additional radiating element extends from the main portion of the main antenna. Multiple resonance antenna.

3. The multiple resonance antenna according to claim 1 or 2, The multiple resonance antenna includes a substrate, The main portion of the main antenna and the additional radiating element are configured in a pattern on the substrate. Multiple resonance antenna.

4. The multiple resonance antenna according to claim 1 or 2, The multiple resonance antenna includes a substrate, The main portion of the main antenna is composed of a pattern on the substrate and a metal member separate from the substrate. Multiple resonance antenna.

5. 5. The multiple resonance antenna according to claim 4, The additional radiating element is configured as a pattern on the substrate. Multiple resonance antenna.

6. A multiple resonance antenna according to any one of claims 1 to 5, The body portion has a first end and a second end, the power supply portion branches off from the main portion at a position closer to the first end than to the second end, The additional radiating element extends from the main portion or from the feeding portion at a position closer to the first end than to the second end. Multiple resonance antenna.

7. 2. The multiple resonance antenna according to claim 1, The ground portion is formed integrally with the main portion of the main antenna by using a metal member. Multiple resonance antenna.

8. 2. The multiple resonance antenna according to claim 1, The multiple resonance antenna includes a substrate, The ground portion is configured by a pattern formed on the substrate. Multiple resonance antenna.

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