Double resonant antenna

Abstract

To provide an antenna having a structure that resonates at multiple operating frequencies.SOLUTION: A double resonant antenna 10 has a main antenna 30 and an additional radiating element 270. The main antenna 30 has a main section 320 comprising a split ring and a feeding section 210 extending outward from the main section 320. The additional radiating element 270 extends directly from the feeding section 210 toward the outside of the main antenna 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a multiple resonance antenna. [Background technology]

[0002] Patent Document 1 discloses a small-sized, wideband antenna 900. As shown in Fig. 8, the 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, 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 extending outward from the main portion, The additional radiating element extends directly from the feed portion toward the outside of the main antenna. 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 power supply unit includes a first power supply point, a first power supply portion, a second power supply point, and a second power supply portion; the first power supply portion has a first portion extending from the main portion in a first predetermined direction and a second portion extending from the first portion in a second predetermined direction intersecting the first predetermined direction, the second portion has a first segment extending from the first portion and a second segment extending from the first segment, In the second predetermined direction, a center of the second portion is located between the first segment and the second segment, In the second predetermined direction, the first feeding point is provided at an end of the second segment, The second power supply portion extends from the main portion to the second power supply point, The additional radiating element extends from the second segment. 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 second portion has a straight portion that extends straight in the second predetermined direction, The additional radiating element has an additional straight portion extending straight in the second predetermined direction, The straight portion and the additional straight portion are parallel to each other and form an open slot with one end open. A multiple resonance antenna is provided.

[0009] Furthermore, the present invention provides a fourth multiple resonance antenna, which is the second multiple resonance antenna, The multiple resonance antenna further includes an auxiliary radiating element extending from the second feeding portion toward an outside of the main antenna. A multiple resonance antenna is provided. Effect of the Invention

[0010] The multiple resonance antenna of the present invention includes an additional radiating element in addition to the main antenna. This allows the multiple resonance antenna of the present invention to resonate at both the operating frequency of the main antenna and the operating frequency of the additional radiating element. 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]

[0011] [Figure 1] 1 is a top view showing a multiple resonance antenna according to an embodiment of the present invention; [Diagram 2] 1. FIG. 4 is a top view showing a first modified example of the multiple resonance antenna of FIG. [Diagram 3] 1. FIG. 4 is a top view showing a second modified example of the multiple resonance antenna of FIG. [Figure 4] 1. FIG. 4 is a top view showing a third modified example of the multiple resonance antenna of FIG. [Diagram 5] 1. FIG. 4 is a top view showing a fourth modified example of the multiple resonance antenna of FIG. [Figure 6] 1. FIG. 4 is a top view showing a fifth modified example of the multiple resonance antenna of FIG. [Figure 7] 1. FIG. 4 is a top view showing a sixth 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

[0012] 1, a multiple resonance antenna 10 according to the embodiment of the present invention includes a main antenna 30 and an additional radiating element 270. Note that a ground conductor is not provided around the multiple resonance antenna 10 of the present embodiment.

[0013] As shown in FIG. 1, the main antenna 30 and the additional radiating element 270 are located on the same plane perpendicular to the up-down direction. In this embodiment, the up-down direction is the Z direction. The +Z direction is upward, and the -Z direction is downward. In the multiple resonance antenna 10, the main antenna 30 and the additional radiating element 270 are integrally formed. The combination of the main antenna 30 and the additional radiating element 270 is configured by a conductor pattern formed on a substrate (not shown). Note that the present invention is not limited to this, and the combination of the main antenna 30 and the additional radiating element 270 may be configured by, for example, a metal member mounted on the substrate during use. Note that, when the main antenna 30 and the additional radiating element 270 are configured by microfabrication, it is more preferable to configure them by a conductor pattern formed on a substrate, since this is superior in terms of mechanical strength.

[0014] As shown in FIG. 1, the main antenna 30 includes a main section 320 and a power feed section 210.

[0015] As shown in Fig. 1, the shape of the main part 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 main part 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, in addition to 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.

[0016] As shown in FIG. 1, the main portion 320 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. The first portion 330 and the second portion 332 are aligned in a first predetermined direction. The first portion 330 and the second portion 332 are located at the same position in the front-rear direction. The fourth portion 336 extends along the lateral direction. The fourth portion 336 is separated from both the first portion 330 and the second portion 332 in the front-rear direction. The fourth portion 336 is disposed in parallel with the first portion 330. The fourth portion 336 is disposed in parallel with 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 separated from each other in the lateral direction. The third portion 334 and the fifth portion 338 are disposed parallel to each other. 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, and the +Y direction may be particularly referred to as the third predetermined direction.

[0017] 1, the first portion 330 is located on the first predetermined direction side of the second portion 332. The first portion 330 is located on the first predetermined direction side of the third portion 334. The fourth portion 336 is located on the second predetermined direction side of the first portion 330. The fourth portion 336 is located on the second predetermined direction side of the second portion 332. The fifth portion 338 is located on the first predetermined direction side of the third portion 334.

[0018] As shown in FIG. 1, the first portion 330 and the second portion 332 of the main portion 320 have a first end 322 and a second end 324, respectively. The first end 322 and the second end 324 face each other and separate from each other to form a split portion 326. The split portion 326 extends linearly in a second predetermined direction. The third portion 334 of the main portion 320 connects the second portion 332 and the fourth portion 336. The fifth portion 338 of the main portion 320 connects the first portion 330 and the fourth portion 336. Thus, the main portion 320 constitutes a split ring having the split portion 326. However, the present invention is not limited thereto. The main portion 320 may have other annular shapes, such as a circular shape or an elliptical shape, as long as it constitutes a split ring.

[0019] As shown in FIG. 1, the main antenna 30 further includes a facing portion 350 .

[0020] As shown in FIG. 1, 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 extend in the front-rear direction from the first end portion 322 and the second end portion 324, respectively. That is, the first facing portion 352 and the second facing portion 354 extend linearly in the front-rear direction from the first end portion 322 and the second end portion 324, respectively. The first facing portion 352 and the second facing portion 354 also extend toward the inside of the main portion 320. The first facing portion 352 and the second facing portion 354 are arranged parallel to each other at a predetermined distance apart. However, the present invention is not limited to this. In the present invention, the first facing portion 352 and the second facing portion 354 may be formed to configure a capacitor having desired characteristics, and their shapes and sizes are not particularly limited.

[0021] 1, the 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.

[0022] 1, power feeding unit 210 is provided to extend outward from main unit 320. Power feeding unit 210 is located on a first predetermined direction side (-X side) of main unit 320. Note that the present invention is not limited to this, and power feeding unit 210 may be located on a side other than the -X side of main unit 320. Power feeding unit 210 includes first feeding point 2421, first feeding portion 220, second feeding point 252, and second feeding portion 250.

[0023] 1, the excitation source 40 is connected to the first feeding point 2421. Specifically, the first feeding point 2421 is connected to a core wire (not shown) of a coaxial cable (not shown).

[0024] 1, the first power feeding portion 220 extends from the main portion 320 to a first power feeding point 2421. The first power feeding portion 220 has a first portion 230 and a second portion 240.

[0025] 1, the first portion 230 extends from the main portion 320 in the first predetermined direction. That is, the first portion 230 extends linearly from the main portion 320 in the first predetermined direction. However, the present invention is not limited thereto, and the first portion 230 may have any shape as long as it extends from the main portion 320 in the first predetermined direction. The first portion 230 is located at the same position as the first portion 330 in the front-rear direction. The first portion 230 is located on the first predetermined direction side of the first portion 330.

[0026] As shown in FIG. 1, the second portion 240 extends from the first portion 230 in a second predetermined direction intersecting the first predetermined direction. That is, the second portion 240 extends from the first portion 230 in a second predetermined direction perpendicular to the first predetermined direction. The second portion 240 extends in the second predetermined direction from an end of the first portion 230 in the first predetermined direction. In the second predetermined direction, the first feeding point 2421 is provided at an end of the second portion 240. The second portion 240 has a straight portion 2422 that extends linearly in the second predetermined direction. More specifically, the second portion 240 is composed of only the straight portion 2422 that extends linearly in the second predetermined direction. Note that the present invention is not limited thereto, and the second portion 240 may have any shape as long as it extends from the first portion 230 in the second predetermined direction.

[0027] As shown in FIG. 1, the second portion 240 has a first segment 241 and a second segment 242 .

[0028] 1, the first segment 241 extends from the first portion 230. That is, the first segment 241 extends linearly in the second predetermined direction from the first portion 230. The first segment 241 extends linearly in the second predetermined direction from an end of the first portion 230 in the first predetermined direction.

[0029] 1, the second segment 242 extends from the first segment 241. That is, the second segment 242 extends linearly from the first segment 241 in the second predetermined direction. In the second predetermined direction, the center 245 of the second part 240 is located between the first segment 241 and the second segment 242. That is, in the second predetermined direction, the center 245 of the second part 240 is located at the boundary between the first segment 241 and the second segment 242. In the second predetermined direction, the first feeding point 2421 is provided at the end of the second segment 242.

[0030] 1, the excitation source 40 is connected to the second feeding point 252. Specifically, the second feeding point 252 is connected to an outer conductor (not shown) of a coaxial cable.

[0031] 1, the second power feeding portion 250 extends from the main portion 320 to the second power feeding point 252. That is, the second power feeding portion 250 extends linearly from the main portion 320 to the second power feeding point 252 in the first predetermined direction. The second power feeding portion 250 is located at the same position as the fourth portion 336 in the front-rear direction. The second power feeding portion 250 is located on the first predetermined direction side of the fourth portion 336.

[0032] 1, the additional radiating element 270 extends directly from the power feed portion 210 toward the outside of the main antenna 30. The additional radiating element 270 extends toward the outside from the power feed portion 210. The additional radiating element 270 extends from the power feed portion 210 in a first predetermined direction.

[0033] 1, the additional radiating element 270 extends from the second segment 242 including the first feeding point 2421. As a result, the additional radiating element 270 is configured to extend from the vicinity of the first feeding point 2421, making it easier to achieve impedance matching.

[0034] As shown in FIG. 1, the additional radiating element 270 has an additional straight portion 272 that extends linearly in the second predetermined direction. The straight portion 2422 and the additional straight portion 272 are located apart from each other in the lateral direction. The straight portion 2422 and the additional straight portion 272 are parallel to each other and form an open slot 260 with one end open. This makes it easier for the additional radiating element 270 to achieve impedance matching. The end of the open slot 260 on the third predetermined direction side is open. Note that the longer the length of the open slot 260 in the second predetermined direction, the easier it is to achieve impedance matching for the additional radiating element 270, so it is preferable that the length of the open slot 260 in the second predetermined direction is longer.

[0035] As shown in FIG. 1, the additional radiating element 270 has a base 271 and a first extension 274. The base 271 extends from the second segment 242 in a first predetermined direction. That is, the base 271 extends linearly from the second segment 242 in the first predetermined direction. The base 271 and the first extension 274 are connected by an additional straight line 272. The additional straight line 272 extends from the base 271 in a third predetermined direction. The first extension 274 extends from the additional straight line 272 in the first predetermined direction. That is, the first extension 274 extends linearly from the additional straight line 272 in the first predetermined direction. The first extension 274 is a rectangle having a long side in the horizontal direction. Note that the present invention is not limited to this, and the shape of the first extension 274 is not limited to a rectangle, and may have a wide portion at its tip.

[0036] Although the additional radiating element 270 of the present embodiment has the base 271, the additional straight portion 272, and the first extension portion 274, the present invention is not limited to this. The additional radiating element 270 may be composed of only the first extension portion 274 extending directly from the second segment 242 without having the base 271 and the additional straight portion 272.

[0037] The length and shape of the additional radiating element 270 are determined so as to be electrically resonant at a desired operating frequency, which is a frequency different from the operating frequency of the main antenna 30.

[0038] As can be seen from FIG. 1, in the multiple resonance antenna 10, the main antenna 30 is fed from the first feeding point 2421 and the second feeding point 252. The additional radiating element 270 is connected to the feeding section 210. With this configuration, the main antenna 30 operates as a split ring resonator (LC resonant circuit or first resonant section), and the additional radiating element 270 operates as a second resonant section different from the first resonant section. The first resonant section and the second resonant section have mutually different resonant frequencies. In this way, the multiple resonance antenna 10 of this embodiment has a structure that electrically resonates at two operating frequencies, the operating frequency of the main antenna (first resonant section) 30 and the operating frequency of the additional radiating element (second resonant section) 270.

[0039] Although the embodiment of the present invention has been described above, the embodiment may be modified as follows.

[0040] (Variation 1) 2, the multiple resonance antenna 10A of the first modified example includes a main antenna 30A and an additional radiating element 270A. Note that the multiple resonance antenna 10A of this modified example does not have a ground conductor provided therearound.

[0041] As shown in Fig. 2, the main antenna 30A and the additional radiating element 270A are located on the same plane perpendicular to the up-down direction. In the multiple resonance antenna 10A, the main antenna 30A and the additional radiating element 270A are integrally formed. The combination of the main antenna 30A and the additional radiating element 270A is configured by a conductor pattern formed on a substrate (not shown). Note that the present invention is not limited to this, and the combination of the main antenna 30A and the additional radiating element 270A may be configured by, for example, a metal member mounted on the substrate during use.

[0042] 2, the main antenna 30A includes a main portion 320, a facing portion 350, and a power supply portion 210A. Here, the main portion 320 and the facing portion 350 are the same as the main portion 320 and the facing portion 350 of the multiple resonance antenna 10 of the present embodiment, and therefore detailed description thereof will be omitted.

[0043] As shown in FIG. 2, power supply unit 210A is provided so as to extend outward from main unit 320. Power supply unit 210A is located on the first predetermined direction side (-X side) of main unit 320. Note that the present invention is not limited thereto, and power supply unit 210A may be located on a side other than the -X side of main unit 320. Power supply unit 210A includes first feeding point 2421, first feeding section 220A, second feeding point 252, and second feeding section 250A. Here, first feeding point 2421 and second feeding point 252 are similar to first feeding point 2421 and second feeding point 252 of multiple resonance antenna 10 of this embodiment, and detailed description thereof will be omitted.

[0044] 2, the first power feeding portion 220A extends from the main portion 320 to the first power feeding point 2421. The first power feeding portion 220A has a first portion 230 and a second portion 240A. Here, the first portion 230 is the same as the first portion 230 of the multiple resonance antenna 10 of the present embodiment, and therefore a detailed description thereof will be omitted.

[0045] As shown in FIG. 2, the second portion 240A extends from the first portion 230 in a second predetermined direction intersecting the first predetermined direction. That is, the second portion 240A extends from the first portion 230 in a second predetermined direction perpendicular to the first predetermined direction. The second portion 240A extends from an end of the first portion 230 in the first predetermined direction in the second predetermined direction. In the second predetermined direction, the first feeding point 2421 is provided at an end of the second portion 240A. The second portion 240A has a straight portion 2422 that extends linearly in the second predetermined direction, and an extension portion 244. The extension portion 244 extends from the straight portion 2422 in the first predetermined direction. That is, the extension portion 244 extends linearly from the straight portion 2422 in the first predetermined direction.

[0046] 2, the second portion 240A has a first segment 241 and a second segment 242A. Here, the first segment 241 is the same as the first segment 241 of the multiple resonance antenna 10 of the present embodiment, and therefore a detailed description thereof will be omitted.

[0047] As shown in FIG. 2, the second segment 242A extends from the first segment 241. More specifically, the second segment 242A extends linearly from the first segment 241 in the second predetermined direction, then bends and extends linearly in the first predetermined direction. In the second predetermined direction, the center 245A of the second portion 240A is located between the first segment 241 and the second segment 242A. That is, in the second predetermined direction, the center 245A of the second portion 240A is located at the boundary between the first segment 241 and the second segment 242A. In the second predetermined direction, the first feeding point 2421 is provided at the end of the second segment 242A.

[0048] 2, the second power feeding portion 250A extends from the main portion 320 to the second power feeding point 252. That is, the second power feeding portion 250A extends linearly from the main portion 320 to the second power feeding point 252 in the first predetermined direction. The second power feeding portion 250A is located at the same position as the fourth portion 336 in the front-rear direction. The second power feeding portion 250A is located on the first predetermined direction side of the fourth portion 336.

[0049] 2, the additional radiating element 270A extends directly from the power feed portion 210A toward the outside of the main antenna 30A. The additional radiating element 270A extends toward the outside from the power feed portion 210A. The additional radiating element 270A extends from the power feed portion 210A in a first predetermined direction.

[0050] 2, the additional radiating element 270A extends from the second segment 242A including the first feeding point 2421. As a result, the additional radiating element 270A is configured to extend from the vicinity of the first feeding point 2421, making it easier to achieve impedance matching.

[0051] As shown in FIG. 2, the additional radiating element 270A has an additional straight portion 272A that extends linearly in the second predetermined direction. The additional straight portion 272A extends from the second segment 242A in the third predetermined direction. The straight portion 2422 and the additional straight portion 272A are located apart from each other in the lateral direction. The straight portion 2422 and the additional straight portion 272A are parallel to each other and form an open slot 260A with one end open. This makes it easier for the additional radiating element 270A to achieve impedance matching. The end of the open slot 260A on the third predetermined direction side is open.

[0052] 2, the additional radiating element 270A has a first extension portion 274. That is, unlike the additional radiating element 270 of the above-mentioned embodiment, the additional radiating element 270A does not have a base portion 271. Here, the first extension portion 274 is the same as the first extension portion 274 of the multiple resonance antenna 10 of the present embodiment, and therefore a detailed description thereof will be omitted.

[0053] Although the additional radiating element 270A of the present embodiment has the additional straight portion 272A and the first extending portion 274, the present invention is not limited to this. The additional radiating element 270A may be composed of only the first extending portion 274 extending directly from the second segment 242A without having the additional straight portion 272A.

[0054] The length and shape of the additional radiating element 270A are determined so as to electrically resonate at a desired operating frequency, which is a frequency different from the operating frequency of the main antenna 30A.

[0055] As can be seen from Figure 2, the multiple resonance antenna 10A 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) 270A.

[0056] (Variation 2) 3, the multiple resonance antenna 10B of the second modified example includes a main antenna 30B and an additional radiating element 270B. Note that the multiple resonance antenna 10B of this modified example does not have a ground conductor provided therearound.

[0057] As shown in Fig. 3, the main antenna 30B and the additional radiating element 270B are located on the same plane perpendicular to the up-down direction. In the multiple resonance antenna 10B, the main antenna 30B and the additional radiating element 270B are integrally formed. The combination of the main antenna 30B and the additional radiating element 270B is configured by a conductor pattern formed on a substrate (not shown). Note that the present invention is not limited to this, and the combination of the main antenna 30B and the additional radiating element 270B may be configured by, for example, a metal member mounted on the substrate during use.

[0058] 3, the main antenna 30B includes a main portion 320, a facing portion 350, and a power supply portion 210B. Here, the main portion 320 and the facing portion 350 are the same as the main portion 320 and the facing portion 350 of the multiple resonance antenna 10 of the present embodiment, and therefore detailed description thereof will be omitted.

[0059] 3, power feeding unit 210B is provided to extend outward from main unit 320. Power feeding unit 210B is located on the first predetermined direction side (-X side) of main unit 320. Note that the present invention is not limited to this, and power feeding unit 210B may be located on a side other than the -X side of main unit 320. Power feeding unit 210B includes first feeding point 2421B, first feeding portion 220B, second feeding point 252B, and second feeding portion 250B.

[0060] 3, the first feeding point 2421B is connected to the excitation source 40. Specifically, a core wire (not shown) of a coaxial cable (not shown) is connected to the first feeding point 2421B.

[0061] 3, the first power feeding portion 220B extends from the main portion 320 to the first power feeding point 2421B. The first power feeding portion 220B has a first portion 230 and a second portion 240B. Here, the first portion 230 is the same as the first portion 230 of the multiple resonance antenna 10 of the present embodiment, and therefore a detailed description thereof will be omitted.

[0062] As shown in FIG. 3, the second portion 240B extends from the first portion 230 in a second predetermined direction intersecting the first predetermined direction. That is, the second portion 240B extends from the first portion 230 in a second predetermined direction perpendicular to the first predetermined direction. The second portion 240B extends in the second predetermined direction from an end of the first portion 230 in the first predetermined direction. The second portion 240B has a straight portion 2422B that extends linearly in the second predetermined direction. More specifically, the second portion 240B is composed only of the straight portion 2422B that extends linearly in the second predetermined direction. The second portion 240B of this modification is slightly shorter in length in the second predetermined direction than the second portion 240 of the present embodiment. In the second predetermined direction, the first feeding point 2421B is provided at an end of the second portion 240B.

[0063] 3, the second portion 240B has a first segment 241 and a second segment 242B. Here, the first segment 241 is the same as the first segment 241 of the multiple resonance antenna 10 of the present embodiment, and therefore a detailed description thereof will be omitted.

[0064] As shown in Fig. 3, the second segment 242B extends from the first segment 241. That is, the second segment 242B extends linearly from the first segment 241 in the second predetermined direction. In the second predetermined direction, the center 245B of the second part 240B is located between the first segment 241 and the second segment 242B. That is, in the second predetermined direction, the center 245B of the second part 240B is located at the boundary between the first segment 241 and the second segment 242B. In the second predetermined direction, the first feeding point 2421B is provided at the end of the second segment 242B.

[0065] 3, the second feeding point 252B is connected to the excitation source 40. Specifically, an outer conductor (not shown) of a coaxial cable is connected to the second feeding point 252B.

[0066] 3, the second power feeding portion 250B extends from the main portion 320 to the second power feeding point 252B. More specifically, the second power feeding portion 250B extends linearly from the main portion 320 in the first predetermined direction, and then bends and extends in the third predetermined direction to the second power feeding point 252B. The second power feeding portion 250B is located on the first predetermined direction side of the fourth portion 336.

[0067] 3, the additional radiating element 270B extends directly from the power feed portion 210B toward the outside of the main antenna 30B. The additional radiating element 270B extends outward from the power feed portion 210B. The additional radiating element 270B extends from the power feed portion 210B in a first predetermined direction.

[0068] 3, the additional radiating element 270B extends from the second segment 242B including the first feeding point 2421B. As a result, the additional radiating element 270B is configured to extend from the vicinity of the first feeding point 2421B, making it easier to achieve impedance matching.

[0069] As shown in FIG. 3, the additional radiating element 270B has an additional straight portion 272B that extends linearly in the second predetermined direction. The straight portion 2422B and the additional straight portion 272B are located apart from each other in the horizontal direction. The straight portion 2422B and the additional straight portion 272B are parallel to each other and form an open slot 260B with one end open. This makes it easier to achieve impedance matching for the additional radiating element 270B. The end of the open slot 260B on the third predetermined direction side is open.

[0070] As shown in FIG. 3, the additional radiating element 270B has a base 271B and a first extension 274. Here, the first extension 274 is the same as the first extension 274 of the multiple resonance antenna 10 of this embodiment, so a detailed description thereof will be omitted. The base 271B extends from the second segment 242B in a first predetermined direction. That is, the base 271B extends linearly from the second segment 242B in the first predetermined direction. The base 271B and the first extension 274 are connected by an additional straight portion 272B. The additional straight portion 272B extends from the base 271B in a third predetermined direction.

[0071] Although the additional radiating element 270B of the present embodiment has the base 271B, the additional straight portion 272B, and the first extension portion 274, the present invention is not limited to this. The additional radiating element 270B may not have the base 271B and the additional straight portion 272B, and may be composed of only the first extension portion 274 that extends directly from the second segment 242B.

[0072] The length and shape of the additional radiating element 270B are determined so as to electrically resonate at a desired operating frequency, which is a frequency different from the operating frequency of the main antenna 30B.

[0073] As can be seen from Figure 3, 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) 30B and the operating frequency of the additional radiating element (second resonance portion) 270B.

[0074] (Variation 3) 4, the multiple resonance antenna 10C of the third modified example includes a main antenna 30, an additional radiating element 270, and an auxiliary radiating element 280. Here, the main antenna 30 and the additional radiating element 270 are the same as the main antenna 30 and the additional radiating element 270 of the multiple resonance antenna 10 of the present embodiment, and therefore detailed description thereof will be omitted. Note that the multiple resonance antenna 10C of this modified example does not have a ground conductor provided around it.

[0075] As shown in Fig. 4, the main antenna 30, the additional radiating element 270, and the auxiliary radiating element 280 are located on the same plane perpendicular to the up-down direction. In the multiple resonance antenna 10C, the main antenna 30, the additional radiating element 270, and the auxiliary radiating element 280 are integrally formed. The combination of the main antenna 30, the additional radiating element 270, and the auxiliary radiating element 280 is configured by a conductor pattern formed on a substrate (not shown). Note that the present invention is not limited to this, and the combination of the main antenna 30, the additional radiating element 270, and the auxiliary radiating element 280 may be configured by, for example, a metal member mounted on the substrate during use.

[0076] 4, the auxiliary radiating element 280 extends from the second feeding portion 250 toward the outside of the main antenna 30. More specifically, the auxiliary radiating element 280 extends linearly from the second feeding portion 250 toward the outside of the main antenna 30, and then bends and extends in a third predetermined direction. The auxiliary radiating element 280 extends from the second feeding portion 250 in a first predetermined direction. The auxiliary radiating element 280 has a first straight portion 282 and a second straight portion 284.

[0077] 4, the first straight portion 282 extends linearly in a first predetermined direction from the second feeding portion 250. The first straight portion 282 is located on the second predetermined direction side of the additional radiating element 270. In other words, the additional radiating element 270 is located on the third predetermined direction side of the first straight portion 282.

[0078] 4, the second straight line portion 284 extends linearly in the third predetermined direction from the first straight line portion 282. The second straight line portion 284 is located on the first predetermined direction side of the additional radiating element 270. Note that the second straight line portion 284 is not connected to the additional radiating element 270.

[0079] The length and shape of the auxiliary radiating element 280 are determined so as to be electrically resonant at a desired operating frequency, which is a frequency different from the operating frequencies of the main antenna 30 and the additional radiating element 270.

[0080] As can be seen from Fig. 4, the auxiliary radiating element 280 operates as a third resonating unit different from the first resonating unit and the second resonating unit. The first resonating unit, the second resonating unit, and the third resonating unit have different resonant frequencies. In this manner, the multiple resonant antenna 10C of this modified example has a structure that electrically resonates at three operating frequencies: the operating frequency of the main antenna (first resonating unit) 30, the operating frequency of the additional radiating element (second resonating unit) 270, and the operating frequency of the auxiliary radiating element 280 (third resonating unit).

[0081] (Variation 4) 5, the multiple resonance antenna 10D of the fourth modified example includes a main antenna 30, an additional radiating element 270, and an auxiliary radiating element 280D. Here, the main antenna 30 and the additional radiating element 270 are the same as the main antenna 30 and the additional radiating element 270 of the multiple resonance antenna 10 of the present embodiment, and therefore detailed description thereof will be omitted. Note that the multiple resonance antenna 10D of this modified example does not have a ground conductor provided around it.

[0082] As shown in Fig. 5, the main antenna 30, the additional radiating element 270, and the auxiliary radiating element 280D are located on the same plane perpendicular to the up-down direction. In the multiple resonance antenna 10D, the main antenna 30, the additional radiating element 270, and the auxiliary radiating element 280D are integrally formed. The combination of the main antenna 30, the additional radiating element 270, and the auxiliary radiating element 280D is configured by a conductor pattern formed on a substrate (not shown). Note that the present invention is not limited to this, and the combination of the main antenna 30, the additional radiating element 270, and the auxiliary radiating element 280D may be configured by, for example, a metal member mounted on the substrate during use.

[0083] 5, the auxiliary radiating element 280D extends from the second feeding portion 250 toward the outside of the main antenna 30. The auxiliary radiating element 280D has a first straight portion 282, a wide portion 283, and a second straight portion 284. Here, the first straight portion 282 and the second straight portion 284 are the same as the first straight portion 282 and the second straight portion 284 of the auxiliary radiating element 280C of the multiple resonance antenna 10C of the third modified example, and therefore a detailed description thereof will be omitted.

[0084] 5, the wide portion 283 extends in the third predetermined direction from the first straight portion 282. The wide portion 283 is located on the second predetermined direction side of the additional radiating element 270. Note that the wide portion 283 is not connected to the additional radiating element 270.

[0085] The length and shape of the auxiliary radiating element 280D are determined so as to electrically resonate at a desired operating frequency, which is a frequency different from the operating frequencies of the main antenna 30 and the additional radiating element 270.

[0086] As can be seen from Fig. 5, the auxiliary radiating element 280D operates as a third resonating unit different from the first resonating unit and the second resonating unit. The first resonating unit, the second resonating unit, and the third resonating unit have mutually different resonant frequencies. In this manner, the multiple resonant antenna 10D of this modified example has a structure that electrically resonates at three operating frequencies: the operating frequency of the main antenna (first resonating unit) 30, the operating frequency of the additional radiating element (second resonating unit) 270, and the operating frequency of the auxiliary radiating element 280D (third resonating unit).

[0087] (Variation 5) 6, the multiple resonance antenna 10E of the fifth modified example includes a main antenna 30, an additional radiating element 270, and an auxiliary radiating element 280E. Here, the main antenna 30 and the additional radiating element 270 are the same as the main antenna 30 and the additional radiating element 270 of the multiple resonance antenna 10 of the present embodiment, and therefore detailed description thereof will be omitted. Note that the multiple resonance antenna 10E of this modified example does not have a ground conductor provided around it.

[0088] As shown in Fig. 6, the main antenna 30, the additional radiating element 270, and the auxiliary radiating element 280E are located on the same plane perpendicular to the up-down direction. In the multiple resonance antenna 10E, the main antenna 30, the additional radiating element 270, and the auxiliary radiating element 280E are integrally formed. The combination of the main antenna 30, the additional radiating element 270, and the auxiliary radiating element 280E is configured by a conductor pattern formed on a substrate (not shown). Note that the present invention is not limited to this, and the combination of the main antenna 30, the additional radiating element 270, and the auxiliary radiating element 280E may be configured by, for example, a metal member mounted on the substrate during use.

[0089] 6, the auxiliary radiating element 280E extends from the second feeding portion 250 toward the outside of the main antenna 30. The auxiliary radiating element 280E has a first straight portion 282, a wide portion 283, a second straight portion 284, a crank portion 286, and an additional wide portion 287. Here, the first straight portion 282, the wide portion 283, and the second straight portion 284 are the same as the first straight portion 282, the wide portion 283, and the second straight portion 284 of the auxiliary radiating element 280D of the multiple resonance antenna 10D of the fourth modified example, and therefore a detailed description thereof will be omitted.

[0090] 6, the crank portion 286 extends in a first predetermined direction from the second straight portion 284. More specifically, the crank portion 286 extends linearly from the second straight portion 284 in the first predetermined direction, then bends to extend linearly in the second predetermined direction, and then bends again to extend linearly in the first predetermined direction.

[0091] As shown in FIG. 6, the additional widened portion 287 extends from the crank portion 286 in a third predetermined direction.

[0092] The length and shape of the auxiliary radiating element 280E are determined so as to electrically resonate at a desired operating frequency, which is a frequency different from the operating frequencies of the main antenna 30 and the additional radiating element 270.

[0093] As can be seen from Fig. 6, the auxiliary radiating element 280E operates as a third resonating unit different from the first resonating unit and the second resonating unit. The first resonating unit, the second resonating unit, and the third resonating unit have mutually different resonant frequencies. In this manner, the multiple resonant antenna 10E of this modified example has a structure that electrically resonates at three operating frequencies: the operating frequency of the main antenna (first resonating unit) 30, the operating frequency of the additional radiating element (second resonating unit) 270, and the operating frequency of the auxiliary radiating element 280E (third resonating unit).

[0094] (Variation 6) 7, the multiple resonance antenna 10F of the sixth modified example includes a main antenna 30F, an additional radiating element 270, and an auxiliary radiating element 280E. Here, the additional radiating element 270 and the auxiliary radiating element 280E are the same as the additional radiating element 270 and the auxiliary radiating element 280E of the multiple resonance antenna 10E of the fifth modified example, and therefore detailed description thereof will be omitted. Note that the multiple resonance antenna 10F of this modified example does not have a ground conductor provided around it.

[0095] As shown in Fig. 7, the main antenna 30F, the additional radiating element 270, and the auxiliary radiating element 280E are located on the same plane perpendicular to the up-down direction. In the multiple resonance antenna 10F, the main antenna 30F, the additional radiating element 270, and the auxiliary radiating element 280E are integrally formed. The combination of the main antenna 30F, the additional radiating element 270, and the auxiliary radiating element 280E is configured by a conductor pattern formed on a substrate (not shown). Note that the present invention is not limited to this, and the combination of the main antenna 30F, the additional radiating element 270, and the auxiliary radiating element 280E may be configured by, for example, a metal member mounted on the substrate during use.

[0096] 7, main antenna 30F includes main section 320 and power feeding section 210. Here, main section 320 and power feeding section 210 are the same as main section 320 and power feeding section 210 of multiple resonance antenna 10 of the present embodiment, and therefore detailed description thereof will be omitted.

[0097] As shown in FIG. 7, the main antenna 30F further includes a facing portion 350F.

[0098] 7, the facing portion 350F has a first facing portion 352F and a second facing portion 354F. The first facing portion 352F and the second facing portion 354F extend in the front-rear direction from the first end portion 322 and the second end portion 324, respectively. The first facing portion 352F and the second facing portion 354F extend toward the inside of the main portion 320. Each of the first facing portion 352F and the second facing portion 354F has a comb-tooth shape. An interdigital slot 360 is formed between the first facing portion 352F and the second facing portion 354F.

[0099] 7, the main portion 320 constitutes an inductance component of the main antenna 30F due to its shape. The first end 322 and the second end 324, together with the first opposing portion 352F and the second opposing portion 354F, constitute a capacitor component of the main antenna 30F. With this configuration, the main antenna 30F can operate as an LC resonant circuit (first resonant portion). The LC resonant circuit formed by the main antenna 30F is also called a split ring resonator. In this manner, the main antenna 30F constitutes the first resonant portion.

[0100] As can be seen from Figure 7, the multiple resonance antenna 10F of this modified example has a structure that electrically resonates at three operating frequencies: the operating frequency of the main antenna (first resonance portion) 30F, the operating frequency of the additional radiating element (second resonance portion) 270, and the operating frequency of the auxiliary radiating element 280E (third resonance portion).

[0101] 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.

[0102] Although the multiple-resonant antennas 10, 10A, 10B, 10C, 10D, 10E, and 10F of the present embodiment and the modified examples do not have a ground conductor provided around them, the present invention is not limited to this, and a ground conductor may be provided on the +X side or the second predetermined direction side (-Y side) of the main antennas 30, 30A, 30B, and 30F, or on the second predetermined direction side (-Y side) of the auxiliary radiating elements 280, 280D, and 280E.

[0103] In the multiple resonance antennas 10, 10A, 10B, 10C, 10D, and 10E of the present embodiment and the modifications, the first opposing portion 352 and the second opposing portion 354 extend linearly in the front-rear direction from the first end 322 and the second end 324, respectively, and the split portion 326 extends linearly in the second predetermined direction, but the present invention is not limited to this. Specifically, the multiple resonance antennas 10, 10A, 10B, 10C, 10D, and 10E may be modified so that the first opposing portion 352 and the second opposing portion 354 each have a comb-tooth shape, as in the first opposing portion 352F and the second opposing portion 354F of the multiple resonance antenna 10F of the sixth modification, and an interdigital slot is formed between the first opposing portion 352 and the second opposing portion 354.

[0104] Although the multiple resonance antennas 10C, 10D, 10E, and 10F of the present modified example are provided with the auxiliary radiating elements 280, 280D, and 280E, the present invention is not limited to this, and the auxiliary radiating elements 280, 280D, and 280E may not be provided. [Explanation of symbols]

[0105] 10, 10A, 10B, 10C, 10D, 10E, 10F Multi-resonant antenna 30, 30A, 30B, 30F Main antenna 40 Excitation source 210, 210A, 210B Power supply unit 220, 220A, 220B 1st power supply part 230 Part 1 240,240A,240B 2nd part 241 First Segment 242, 242A, 242B 2nd segment 2421, 2421B 1st power supply point 2422,2422B Straight section 244 Extension 245,245A,245B center 250, 250A, 250B Second power supply section 252,252B Second power supply point 260, 260A, 260B Open Slot 270, 270A, 270B Additional radiating elements 271,271B base 272, 272A, 272B Additional straight section 274 1st extension section 280, 280D, 280E Auxiliary Radiating Element 282 1st straight line section 283 Wide section 284 2nd straight section 286 Crank section 287 Additional Wide Section 320 Main part (split ring) 322 First end 324 Second end 326 Split Section 330 Part 1 332 Part 2 334 Part 3 336 Part 4 338 Part 5 350,350F Opposite section 352,352F 1st opposing section 354,354F 2nd opposing section 360 Interdigital Slots

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 extending outward from the main portion, The additional radiating element extends directly from the feed portion toward the outside of the main antenna. Multiple resonance antenna.

2. 2. The multiple resonance antenna according to claim 1, the power supply unit includes a first power supply point, a first power supply portion, a second power supply point, and a second power supply portion; the first power supply portion has a first portion extending from the main portion in a first predetermined direction and a second portion extending from the first portion in a second predetermined direction intersecting the first predetermined direction, the second portion has a first segment extending from the first portion and a second segment extending from the first segment, In the second predetermined direction, a center of the second portion is located between the first segment and the second segment, In the second predetermined direction, the first feeding point is provided at an end of the second segment, The second power supply portion extends from the main portion to the second power supply point, The additional radiating element extends from the second segment. Multiple resonance antenna.

3. 3. The multiple resonance antenna according to claim 2, The second portion has a straight portion that extends straight in the second predetermined direction, The additional radiating element has an additional straight portion extending straight in the second predetermined direction, The straight portion and the additional straight portion are parallel to each other and form an open slot with one end open. Multiple resonance antenna.

4. 3. The multiple resonance antenna according to claim 2, The multiple resonance antenna further includes an auxiliary radiating element extending from the second feeding portion toward an outside of the main antenna. Multiple resonance antenna.

Images