Antenna structure

Abstract

The present invention discloses an antenna structure, comprising: a grounding element, a dielectric substrate, a first radiating portion, a second radiating portion, a third radiating portion, a fourth radiating portion, a fifth radiating portion, a sixth radiating portion, and a seventh radiating portion. The dielectric substrate has a first surface and a second surface opposite to each other. The first radiating portion and the third radiating portion are both coupled to a first feeding point. The second radiating portion and the fourth radiating portion are both coupled to the grounding element. The first radiating portion, the second radiating portion, the third radiating portion, and the fourth radiating portion are all arranged on the first surface of the dielectric substrate. The fifth radiating portion is coupled to a second feeding point. The sixth radiating portion and the seventh radiating portion are both coupled to the fifth radiating portion. The fifth radiating portion, the sixth radiating portion, and the seventh radiating portion are all arranged on the second surface of the dielectric substrate.

Description

Technical Field

[0001] The present invention relates to an antenna structure, and in particular to an antenna structure that is nearly omnidirectional. Background Art

[0002] With the development of mobile communication technology, mobile devices have become increasingly popular in recent years, such as portable computers, mobile phones, multimedia players and other hybrid portable electronic devices. In order to meet people's needs, mobile devices usually have wireless communication functions. Some cover long-distance wireless communication ranges, such as mobile phones using 2G, 3G, LTE (Long Term Evolution) systems and the 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz frequency bands used for communication, while some cover short-distance wireless communication ranges, such as Wi-Fi, Bluetooth systems use 2.4GHz, 5.2GHz and 5.8GHz frequency bands for communication.

[0003] Antennas are indispensable components in the field of wireless communications. If the beam coverage of an antenna used to receive or transmit signals is too narrow, it is easy to cause the communication quality of the mobile device to deteriorate. Therefore, how to design an antenna structure that is nearly omnidirectional is an important issue for designers. Summary of the invention

[0004] In a preferred embodiment, the present invention proposes an antenna structure, comprising: a grounding element; a dielectric substrate having a first surface and a second surface opposite to each other; a first radiating portion having a first feeding point; a second radiating portion coupled to the grounding element; a third radiating portion coupled to the first feeding point; a fourth radiating portion coupled to the grounding element, wherein the first radiating portion, the second radiating portion, the third radiating portion, and the fourth radiating portion are all arranged on the first surface of the dielectric substrate; a fifth radiating portion having a second feeding point; a sixth radiating portion coupled to the fifth radiating portion; and a seventh radiating portion coupled to the fifth radiating portion, wherein the fifth radiating portion, the sixth radiating portion, and the seventh radiating portion are all arranged on the second surface of the dielectric substrate.

[0005] In some embodiments, the antenna structure further includes: a signal source; and a switching circuit for coupling the signal source to the first feeding point or the second feeding point according to a control signal.

[0006] In some embodiments, the third radiating portion and the fourth radiating portion are both between the first radiating portion and the second radiating portion.

[0007] In some embodiments, the antenna structure covers a first frequency band, a second frequency band, and a third frequency band, the first frequency band is between 2400 MHz and 2500 MHz, the second frequency band is between 5150 MHz and 5850 MHz, and the third frequency band is between 5925 MHz and 7125 MHz.

[0008] In some embodiments, the first radiation portion is in a J-shape, and a length of the first radiation portion is between 0.25 times and 0.3 times the wavelength of the first frequency band.

[0009] In some embodiments, the second radiating portion is in an inverted J-shape, and the length of the second radiating portion is between 0.25 times and 0.3 times the wavelength of the first frequency band.

[0010] In some embodiments, a distance between the first radiating portion and the second radiating portion is less than 0.25 times the wavelength of the first frequency band.

[0011] In some embodiments, the third radiation portion is in a C-shape, and a length of the third radiation portion is between 0.25 times and 0.3 times the wavelength of the second frequency band.

[0012] In some embodiments, the fourth radiation portion is in an inverted C-shape, and the length of the fourth radiation portion is between 0.25 times and 0.3 times the wavelength of the second frequency band.

[0013] In some embodiments, the sixth radiation portion is in a U-shape, and the total length of the fifth radiation portion and the sixth radiation portion is between 0.2 and 0.25 times the wavelength of the first frequency band.

[0014] In some embodiments, the sixth radiating portion further includes a first widened portion.

[0015] In some embodiments, the seventh radiation portion is in an L-shape, and a total length of the fifth radiation portion and the seventh radiation portion is substantially equal to 0.3 times the wavelength of the second frequency band.

[0016] In some embodiments, the seventh radiating portion further includes a second widened portion.

[0017] In some embodiments, the sixth radiation portion is in an L-shape, and a total length of the fifth radiation portion and the sixth radiation portion is substantially equal to 0.2 times the wavelength of the first frequency band.

[0018] In some embodiments, the seventh radiation portion is in a straight strip shape, and a total length of the fifth radiation portion and the seventh radiation portion is substantially equal to 0.2 times the wavelength of the second frequency band.

[0019] In some embodiments, the antenna structure also includes: an eighth radiating portion having a third feeding point; a ninth radiating portion coupled to the eighth radiating portion; and a tenth radiating portion coupled to the eighth radiating portion, wherein the eighth radiating portion, the ninth radiating portion, and the tenth radiating portion are all disposed on the second surface of the dielectric substrate.

[0020] In some embodiments, the antenna structure further includes: a signal source; and a switching circuit for coupling the signal source to the first feeding point, the second feeding point, or the third feeding point according to a control signal.

[0021] In some embodiments, the ninth radiation portion is in a U-shape, and the total length of the eighth radiation portion and the ninth radiation portion is between 0.2 times and 0.25 times the wavelength of the first frequency band.

[0022] In some embodiments, the tenth radiation portion is in an L-shape, and a total length of the eighth radiation portion and the tenth radiation portion is substantially equal to 0.3 times the wavelength of the second frequency band.

[0023] In some embodiments, the tenth radiating portion further includes a first widened portion and a second widened portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1A A top view of an antenna structure according to an embodiment of the present invention;

[0025] Figure 1B A perspective view of an antenna structure according to an embodiment of the present invention;

[0026] Figure 1C A side view of an antenna structure according to an embodiment of the present invention;

[0027] Figure 1D A schematic diagram of a switching circuit and a signal source according to an embodiment of the present invention;

[0028] Figure 2A A return loss diagram of the antenna structure according to an embodiment of the present invention when the switching circuit is switched to the first feeding point;

[0029] Figure 2B A return loss diagram of the antenna structure according to an embodiment of the present invention when the switching circuit is switched to the second feeding point;

[0030] Figure 3A A radiation pattern diagram of the antenna structure according to an embodiment of the present invention when operating in a first frequency band;

[0031] Figure 3BA radiation pattern diagram of the antenna structure according to an embodiment of the present invention when operating in a second frequency band;

[0032] Figure 4A A top view of an antenna structure according to an embodiment of the present invention;

[0033] Figure 4B A perspective view of an antenna structure according to an embodiment of the present invention;

[0034] Figure 4C A schematic diagram of a switching circuit and a signal source according to an embodiment of the present invention;

[0035] Figure 5A A return loss diagram of the antenna structure according to an embodiment of the present invention when the switching circuit is switched to the first feeding point;

[0036] Figure 5B A return loss diagram of the antenna structure according to an embodiment of the present invention when the switching circuit is switched to the second feeding point;

[0037] Fig. 6A A top view of an antenna structure according to an embodiment of the present invention;

[0038] Figure 6B A perspective view of an antenna structure according to an embodiment of the present invention;

[0039] Figure 6C A schematic diagram of a switching circuit and a signal source according to an embodiment of the present invention;

[0040] Fig. 7A A return loss diagram of the antenna structure according to an embodiment of the present invention when the switching circuit is switched to the first feeding point;

[0041] Figure 7B A return loss diagram of the antenna structure according to an embodiment of the present invention when the switching circuit is switched to the second feeding point;

[0042] Figure 7C It is a return loss diagram of the antenna structure according to an embodiment of the present invention when the switching circuit is switched to the third feeding point.

[0043] Explanation of symbols

[0044] 100,400,600: Antenna structure

[0045] 110,410,610: Grounding element

[0046] 120,420,620: Dielectric substrate

[0047] 130,430,630: First radiation part

[0048] 131,431,631: first end of the first radiation portion

[0049] 132,432,632: second end of the first radiation portion

[0050] 140,440,640: Second radiation part

[0051] 141,441,641: first end of the second radiating portion

[0052] 142,442,642: second end of the second radiating portion

[0053] 150,450,650: The third radiation

[0054] 151,451,651: first end of the third radiation portion

[0055] 152,452,652: second end of the third radiation portion

[0056] 160,460,660: The fourth radiation

[0057] 161,461,661: first end of the fourth radiation portion

[0058] 162,462,662: second end of the fourth radiation portion

[0059] 210,510,710: Fifth Radiation

[0060] 211,511,711: first end of the fifth radiation portion

[0061] 212,512,712: second end of the fifth radiation portion

[0062] 220,520,720: Sixth Radiation Department

[0063] 221,521,721: first end of the sixth radiation portion

[0064] 222,522,722: Second end of the sixth radiation portion

[0065] 225,765: First widening part

[0066] 230,530,730: Seventh Radiation Department

[0067] 231,531,731: first end of the seventh radiation portion

[0068] 232,532,732: Second end of the seventh radiation portion

[0069] 235,766: Second widening part

[0070] 238,758: The bent part at the end

[0071] 270,570,770: Switching circuit

[0072] 290,590,790:Signal source

[0073] 740: The Eighth Radiation Department

[0074] 741: first end of the eighth radiation portion

[0075] 742: second end of the eighth radiation portion

[0076] 750: Ninth Radiation Department

[0077] 751: the first end of the ninth radiation portion

[0078] 752: The second end of the ninth radiation portion

[0079] 760: The Tenth Radiation Department

[0080] 761: first end of the tenth radiation portion

[0081] 762: second end of the tenth radiation portion

[0082] D1,D2,D3,D4: Spacing

[0083] E1, E3, E5: First surface

[0084] E2, E4, E6: Second surface

[0085] FB1, FB4, FB7: First frequency band

[0086] FB2, FB5, FB8: Second frequency band

[0087] FB3, FB6, FB9: The third frequency band

[0088] FP1, FP3, FP5: First feed point

[0089] FP2, FP4, FP6: Second feed point

[0090] FP7: Third Feed Point

[0091] H1:Thickness

[0092] L1,L2,L3,L4,L5,L6,L7,L8,L9,L10,L11,L12,L13,L14,L15,L16,L17,L18,L19,L20: length

[0093] SC1, SC2, SC3: control signal

[0094] X: X-axis

[0095] Y: Y axis

[0096] Z: Z axis DETAILED DESCRIPTION

[0097] In order to make the purpose, features and advantages of the present invention more clearly understood, specific embodiments of the present invention are given below with reference to the accompanying drawings for detailed description as follows.

[0098] Certain words are used in the specification and claims to refer to specific components. It should be understood by those skilled in the art that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. The words "include" and "comprise" mentioned throughout the specification and claims are open-ended terms and should be interpreted as "include but not limited to". The word "substantially" means that within an acceptable error range, those skilled in the art can solve the technical problem and achieve the basic technical effect within a certain error range. In addition, the word "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if the text describes a first device coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device via other devices or connection means.

[0099] The following disclosure provides many different embodiments or examples to implement the different features of the present invention. The following disclosure describes specific examples of various components and their arrangements to simplify the description. Of course, these specific examples are not intended to be limiting. For example, if the present disclosure describes a first feature formed on or above a second feature, it means that it may include an embodiment in which the first feature and the second feature are in direct contact, and may also include an embodiment in which an additional feature is formed between the first feature and the second feature, so that the first feature and the second feature may not be in direct contact. In addition, the same reference symbols and / or marks may be reused in different examples of the following disclosure. These repetitions are for the purpose of simplicity and clarity, and are not intended to limit the specific relationship between the different embodiments and / or structures discussed.

[0100] In addition, spatially related terms such as "below," "below," "lower," "above," "higher," and similar terms are used to facilitate description of the relationship between one element or feature and another element or feature in the figure. In addition to the orientation shown in the drawings, these spatially related terms are intended to include different orientations of the device in use or operation. The device may be turned to different orientations (rotated 90 degrees or other orientations), and the spatially related terms used herein may be interpreted accordingly.

[0101] Figure 1A 1 is a top view of an antenna structure 100 according to an embodiment of the present invention. The antenna structure 100 can be applied to a mobile device, such as a smart phone, a tablet computer, a notebook computer, a wireless access point, a display device, a router, or any device with communication function. Figure 1A As shown, the antenna structure 100 includes: a ground element 110, a dielectric substrate 120, a first radiation part 130, a second radiation part 140, a third radiation part 150, a fourth radiation part 160, a fifth radiation part 210, a sixth radiation part 220, and a seventh radiation part 230, wherein the ground element 110, the first radiation part 130, the second radiation part 140, the third radiation part 150, the fourth radiation part 160, the fifth radiation part 210, the sixth radiation part 220, and the seventh radiation part 230 can be made of metal materials, such as: copper, silver, aluminum, iron, or alloys thereof.

[0102] The dielectric substrate 120 may be a FR4 (Flame Retardant 4) substrate, a printed circuit board (PCB), or a flexible printed circuit (FPC). The dielectric substrate 120 has a first surface E1 and a second surface E2 opposite to each other, wherein the first radiating portion 130, the second radiating portion 140, the third radiating portion 150, and the fourth radiating portion 160 may be disposed on the first surface E1 of the dielectric substrate 120, and the fifth radiating portion 210, the sixth radiating portion 220, and the seventh radiating portion 230 may be disposed on the second surface E2 of the dielectric substrate 120. In addition, the grounding element 110 may be implemented by a grounding copper foil, which may extend to both the first surface E1 and the second surface E2 of the dielectric substrate 120. Figure 1B It is a perspective view showing the antenna structure 100 according to an embodiment of the present invention (ie, the dielectric substrate 120 is regarded as a transparent element, and all elements on the first surface E1 thereof are omitted and not shown). Figure 1C is a side view of an antenna structure 100 according to an embodiment of the present invention. Figure 1A , Figure 1B , Figure 1C To understand the present invention.

[0103] The first radiating portion 130 may be substantially in the shape of a letter J. Specifically, the first radiating portion 130 has a first end 131 and a second end 132, wherein a first feeding point FP1 is located at the first end 131 of the first radiating portion 130, and the second end 132 of the first radiating portion 130 is an open end.

[0104] The second radiating portion 140 may be substantially in the shape of an inverted J, which may be regarded as a mirror image of the first radiating portion 130. Specifically, the second radiating portion 140 has a first end 141 and a second end 142, wherein the first end 141 of the second radiating portion 140 is coupled to the ground element 110, and the second end 142 of the second radiating portion 140 is an open end. For example, the second end 142 of the second radiating portion 140 and the second end 132 of the first radiating portion 130 may extend in a direction close to each other.

[0105] The third radiating portion 150 may be substantially in the shape of a letter C. Specifically, the third radiating portion 150 has a first end 151 and a second end 152, wherein the first end 151 of the third radiating portion 150 is coupled to the first end 131 of the first radiating portion 130 and the first feeding point FP1, and the second end 152 of the third radiating portion 150 is an open end.

[0106] The fourth radiating portion 160 may be substantially in the shape of an inverted C, which may be regarded as a mirror image of the third radiating portion 150. In detail, the fourth radiating portion 160 has a first end 161 and a second end 162, wherein the first end 161 of the fourth radiating portion 160 is coupled to the first end 141 of the second radiating portion 140 and the grounding element 110, and the second end 162 of the fourth radiating portion 160 is an open end. For example, the second end 162 of the fourth radiating portion 160 and the second end 152 of the third radiating portion 150 may extend in a direction close to each other. It should be noted that the third radiating portion 150 and the fourth radiating portion 160 are both between the first radiating portion 130 and the second radiating portion 140, and this design helps to reduce the overall size of the antenna structure 100.

[0107] The fifth radiating portion 210 may be substantially in the shape of a straight strip. Specifically, the fifth radiating portion 210 has a first end 211 and a second end 212 , wherein a second feeding point FP2 is located at the first end 211 of the fifth radiating portion 210 .

[0108] The sixth radiating portion 220 may be substantially U-shaped. Specifically, the sixth radiating portion 220 has a first end 221 and a second end 222, wherein the first end 221 of the sixth radiating portion 220 is coupled to the second end 212 of the fifth radiating portion 210, and the second end 222 of the sixth radiating portion 220 is an open end. In some embodiments, the sixth radiating portion 220 further includes a first widening portion 225, which may be in the form of a narrow rectangle and adjacent to the second feed point FP2, so that the sixth radiating portion 220 becomes a non-uniform width structure. It should be noted that the term "adjacent" or "adjacent" in this specification may refer to a spacing between two corresponding elements that is less than a predetermined distance (e.g., 5 mm or shorter), but generally does not include a situation where the two corresponding elements are in direct contact with each other (i.e., the aforementioned spacing is shortened to 0). In addition, the second radiating portion 140 has a vertical projection on the second surface E2 of the dielectric substrate 120 , and the vertical projection of the second radiating portion 140 may at least partially overlap with the fifth radiating portion 210 and the sixth radiating portion 220 .

[0109] The seventh radiating portion 230 may be substantially L-shaped. Specifically, the seventh radiating portion 230 has a first end 231 and a second end 232, wherein the first end 231 of the seventh radiating portion 230 is coupled to the second end 212 of the fifth radiating portion 210, and the second end 232 of the seventh radiating portion 230 is an open end. In some embodiments, the seventh radiating portion 230 further includes a second widening portion 235, which may be another narrow and long rectangle and is adjacent to the second feeding point FP2, so that the seventh radiating portion 230 becomes an unequal width structure. In addition, the fourth radiating portion 160 has a vertical projection on the second surface E2 of the dielectric substrate 120, and the vertical projection of the fourth radiating portion 160 at least partially overlaps with the seventh radiating portion 230. In some embodiments, the seventh radiating portion 230 further includes a terminal bending portion 238, which is adjacent to the second end 232 of the seventh radiating portion 230. For example, the second end 232 of the seventh radiating portion 230 and the second end 222 of the sixth radiating portion 220 may extend in a direction approaching each other.

[0110] Figure 1D 2 is a schematic diagram showing a switching circuit 270 and a signal source 290 according to an embodiment of the present invention. Figure 1DIn the embodiment of the present invention, the antenna structure 100 further includes a switch circuit 270 and a signal source 290. For example, the signal source 290 may be a radio frequency (RF) module, which may be used to excite the antenna structure 100. The switch circuit 270 may couple the signal source 290 to either the first feed point FP1 or the second feed point FP2 according to a control signal SC1, wherein the control signal SC1 may be generated by a processor according to a user input (not shown).

[0111] Figure 2A 1 is a diagram showing the return loss of the antenna structure 100 according to an embodiment of the present invention when the switching circuit 270 is switched to the first feeding point FP1 . Figure 2B is a graph showing the return loss of the antenna structure 100 according to an embodiment of the present invention when the switching circuit 270 switches to the second feeding point FP2. Figure 2A , Figure 2B According to the measurement results, the antenna structure 100 can cover a first frequency band (Frequency Band) FB1, a second frequency band FB2, and a third frequency band FB3. For example, the first frequency band FB1 may be between 2400MHz and 2500MHz, the second frequency band FB2 may be between 5150MHz and 5850MHz, and the third frequency band FB3 may be between 5925MHz and 7125MHz. Therefore, the antenna structure 100 will at least support the broadband operation of traditional WLAN (Wireless Local Area Network) 2.4GHz / 5GHz and the new generation Wi-Fi 6E. In addition, the radiation efficiency (Radiation Efficiency) of the antenna structure 100 in the aforementioned first frequency band FB1, second frequency band FB2, and third frequency band FB3 can reach more than 44%, which can meet the actual application requirements of general mobile communication devices.

[0112] In terms of antenna principle, the first radiating portion 130, the second radiating portion 140, the fifth radiating portion 210, and the sixth radiating portion 220 can jointly excite to generate the aforementioned first frequency band FB1. The third radiating portion 150, the fourth radiating portion 160, the fifth radiating portion 210, and the seventh radiating portion 230 can jointly excite to generate the aforementioned second frequency band FB2 and third frequency band FB3. In addition, the first widening portion 225 and the second widening portion 235 can also be used to fine-tune the impedance matching (Impedance Matching) of the third frequency band FB3, thereby increasing the operation bandwidth (Operation Bandwidth) of the third frequency band FB3.

[0113] Figure 3A FIG. 1 is a diagram showing a radiation pattern (measured along the XZ plane) of the antenna structure 100 according to an embodiment of the present invention when operating in the first frequency band FB1 . Figure 3B 3A and 3B show the radiation pattern of the antenna structure 100 according to an embodiment of the present invention when operating in the second frequency band FB2 (measured along the XZ plane). It should be understood that since the switching circuit 270 can switch between the first feeding point FP1 and the second feeding point FP2, each of FIG. 3A and FIG. 3B can provide two different radiation patterns. Figure 3A , Figure 3B According to the measurement results, the antenna structure 100 can provide a nearly omnidirectional radiation pattern, thereby greatly improving the overall communication quality.

[0114] In some embodiments, the element size and element parameters of the antenna structure 100 may be as follows. The thickness H1 of the dielectric substrate 120 (i.e., the distance between the first surface E1 and the second surface E2) may be less than or equal to 1.6 mm. The length L1 of the first radiating portion 130 may be between 0.25 times and 0.3 times the wavelength (0.25λ~0.3λ) of the first frequency band FB1 of the antenna structure 100, for example, it may be approximately 0.3 times the wavelength (0.3λ). The length L2 of the second radiating portion 140 may be between 0.25 times and 0.3 times the wavelength (0.25λ~0.3λ) of the first frequency band FB1 of the antenna structure 100, for example, it may be approximately 0.3 times the wavelength (0.3λ). The distance D1 between the first end 131 of the first radiating portion 130 and the first end 141 of the second radiating portion 140 may be less than 0.25 times the wavelength (0.25λ) of the first frequency band FB1 of the antenna structure 100. The length L3 of the third radiation portion 150 may be between 0.25 times and 0.3 times the wavelength (0.25λ~0.3λ) of the second frequency band FB2 of the antenna structure 100, for example, it may be approximately 0.3 times the wavelength (0.3λ). The length L4 of the fourth radiation portion 160 may be between 0.25 times and 0.3 times the wavelength (0.25λ~0.3λ) of the second frequency band FB2 of the antenna structure 100, for example, it may be approximately 0.3 times the wavelength (0.3λ). The total length L5 of the fifth radiation portion 210 and the sixth radiation portion 220 may be between 0.2 times and 0.25 times the wavelength (0.2λ~0.25λ) of the first frequency band FB1 of the antenna structure 100, for example, it may be approximately 0.2 times the wavelength (0.2λ). The total length L6 of the fifth radiation portion 210 and the seventh radiation portion 230 may be substantially equal to 0.3 times the wavelength (0.3λ) of the second frequency band FB2 of the antenna structure 100. The above dimensions and parameter ranges are obtained based on multiple experimental results, which are helpful to optimize the operating bandwidth and impedance matching of the antenna structure 100 .

[0115] Figure 4A FIG. 4 is a top view of an antenna structure 400 according to an embodiment of the present invention. Figure 4B FIG. 4 is a perspective view showing an antenna structure 400 according to an embodiment of the present invention. Figure 4A , Figure 4B In the embodiment of the present invention, the antenna structure 400 includes: a grounding element 410, a dielectric substrate 420, a first radiating portion 430, a second radiating portion 440, a third radiating portion 450, a fourth radiating portion 460, a fifth radiating portion 510, a sixth radiating portion 520, and a seventh radiating portion 530, wherein the grounding element 410, the first radiating portion 430, the second radiating portion 440, the third radiating portion 450, the fourth radiating portion 460, the fifth radiating portion 510, the sixth radiating portion 520, and the seventh radiating portion 530 can all be made of metal materials.

[0116] The dielectric substrate 420 has a first surface E3 and a second surface E4 opposite to each other, wherein the first radiating portion 430, the second radiating portion 440, the third radiating portion 450, and the fourth radiating portion 460 can be disposed on the first surface E3 of the dielectric substrate 420, and the fifth radiating portion 510, the sixth radiating portion 520, and the seventh radiating portion 530 can be disposed on the second surface E4 of the dielectric substrate 420. In addition, the grounding element 410 can extend to both the first surface E3 and the second surface E4 of the dielectric substrate 420.

[0117] The first radiating portion 430 may be substantially in the shape of a letter J. Specifically, the first radiating portion 430 has a first end 431 and a second end 432, wherein a first feeding point FP3 is located at the first end 431 of the first radiating portion 430, and the second end 432 of the first radiating portion 430 is an open end.

[0118] The second radiating portion 440 may be substantially in the shape of an inverted J. Specifically, the second radiating portion 440 has a first end 441 and a second end 442, wherein the first end 441 of the second radiating portion 440 is coupled to the ground element 410, and the second end 442 of the second radiating portion 440 is an open end. For example, the second end 442 of the second radiating portion 440 and the second end 432 of the first radiating portion 430 may extend in a direction close to each other.

[0119] The third radiating portion 450 may be substantially in the shape of a letter C. Specifically, the third radiating portion 450 has a first end 451 and a second end 452, wherein the first end 451 of the third radiating portion 450 is coupled to the first end 431 of the first radiating portion 430 and the first feeding point FP3, and the second end 452 of the third radiating portion 450 is an open end.

[0120] The fourth radiating portion 460 may be substantially in the shape of an inverted C. Specifically, the fourth radiating portion 460 has a first end 461 and a second end 462, wherein the first end 461 of the fourth radiating portion 460 is coupled to the first end 441 of the second radiating portion 440 and the grounding element 410, and the second end 462 of the fourth radiating portion 460 is an open end. For example, the second end 462 of the fourth radiating portion 460 and the second end 452 of the third radiating portion 450 may extend in a direction close to each other.

[0121] The fifth radiating portion 510 may be substantially in the shape of a straight strip. Specifically, the fifth radiating portion 510 has a first end 511 and a second end 512 , wherein a second feeding point FP4 is located at the first end 511 of the fifth radiating portion 510 .

[0122] The sixth radiating portion 520 may be substantially L-shaped. Specifically, the sixth radiating portion 520 has a first end 521 and a second end 522, wherein the first end 521 of the sixth radiating portion 520 is coupled to the second end 512 of the fifth radiating portion 510, and the second end 522 of the sixth radiating portion 520 is an open end, which may extend toward the direction close to the ground element 410. In addition, the first radiating portion 430 has a vertical projection on the second surface E4 of the dielectric substrate 420, and the vertical projection of the first radiating portion 430 may at least partially overlap with the fifth radiating portion 510 and the sixth radiating portion 520.

[0123] The seventh radiating portion 530 may be substantially in the shape of a straight strip, and may be substantially perpendicular to the fifth radiating portion 510. Specifically, the seventh radiating portion 530 has a first end 531 and a second end 532, wherein the first end 531 of the seventh radiating portion 530 is coupled to the second end 512 of the fifth radiating portion 510, and the second end 532 of the seventh radiating portion 530 is an open end, which may extend in a direction away from the fifth radiating portion 510. In addition, the third radiating portion 450 has a vertical projection on the second surface E4 of the dielectric substrate 420, and the vertical projection of the third radiating portion 450 at least partially overlaps with the seventh radiating portion 530.

[0124] Figure 4C is a schematic diagram showing a switching circuit 570 and a signal source 590 according to an embodiment of the present invention. Figure 4C In the embodiment of the present invention, the antenna structure 400 further includes a switching circuit 570 and a signal source 590. The switching circuit 570 can couple the signal source 590 to either the first feeding point FP3 or the second feeding point FP4 according to a control signal SC2.

[0125] Figure 5A It is a graph showing the return loss of the antenna structure 400 according to an embodiment of the present invention when the switching circuit 570 is switched to the first feeding point FP3. Figure 5B is a graph showing the return loss of the antenna structure 400 according to an embodiment of the present invention when the switching circuit 570 switches to the second feeding point FP4. Figure 5A , Figure 5B According to the measurement results, the antenna structure 400 can cover a first frequency band FB4, a second frequency band FB5, and a third frequency band FB6. For example, the first frequency band FB4 may be between 2400MHz and 2500MHz, the second frequency band FB5 may be between 5150MHz and 5850MHz, and the third frequency band FB6 may be between 5925MHz and 7125MHz. Therefore, the antenna structure 400 will at least support the broadband operation of traditional WLAN 2.4GHz / 5GHz and the new generation Wi-Fi 6E. In addition, the radiation efficiency of the antenna structure 400 in the aforementioned first frequency band FB4, second frequency band FB5, and third frequency band FB6 can reach more than 34%, which can meet the actual application requirements of general mobile communication devices.

[0126] In terms of antenna principle, the first radiating portion 430, the second radiating portion 440, the fifth radiating portion 510, and the sixth radiating portion 520 can jointly excite to generate the aforementioned first frequency band FB4. The third radiating portion 450, the fourth radiating portion 460, the fifth radiating portion 510, and the seventh radiating portion 530 can jointly excite to generate the aforementioned second frequency band FB5 and third frequency band FB6.

[0127] In some embodiments, the element dimensions and element parameters of the antenna structure 400 may be as follows. The length L7 of the first radiating portion 430 may be between 0.25 times and 0.3 times the wavelength (0.25λ~0.3λ) of the first frequency band FB4 of the antenna structure 400, for example, it may be approximately 0.25 times the wavelength (0.25λ). The length L8 of the second radiating portion 440 may be between 0.25 times and 0.3 times the wavelength (0.25λ~0.3λ) of the first frequency band FB4 of the antenna structure 400, for example, it may be approximately 0.25 times the wavelength (0.25λ). The distance D2 between the first end 431 of the first radiating portion 430 and the first end 441 of the second radiating portion 440 may be less than 0.25 times the wavelength (0.25λ) of the first frequency band FB4 of the antenna structure 400. The length L9 of the third radiating portion 450 may be between 0.25 times and 0.3 times the wavelength (0.25λ~0.3λ) of the second frequency band FB5 of the antenna structure 400, for example, it may be approximately 0.25 times the wavelength (0.25λ). The length L10 of the fourth radiating portion 460 may be between 0.25 times and 0.3 times the wavelength (0.25λ~0.3λ) of the second frequency band FB5 of the antenna structure 400, for example, it may be approximately 0.25 times the wavelength (0.25λ). The total length L11 of the fifth radiating portion 510 and the sixth radiating portion 520 may be approximately equal to 0.2 times the wavelength of the first frequency band FB4 of the antenna structure 400. The total length L12 of the fifth radiating portion 510 and the seventh radiating portion 530 may be approximately equal to 0.2 times the wavelength (0.2λ) of the second frequency band FB5 of the antenna structure 400. The above dimensions and parameter ranges are obtained based on multiple experimental results, which help to optimize the operating bandwidth and impedance matching of the antenna structure 400. Figure 4A , Figure 4B , Figure 4C The remaining features of the antenna structure 400 are similar to Figure 1A , Figure 1B , Figure 1C , Figure 1D The antenna structure 100 is similar, so the two embodiments can achieve similar operating effects.

[0128] Fig. 6A FIG. 6 is a top view of an antenna structure 600 according to an embodiment of the present invention. Figure 6B FIG. 6 is a perspective view showing an antenna structure 600 according to an embodiment of the present invention. Fig. 6A , Figure 6BIn the embodiment of the present invention, the antenna structure 600 includes: a grounding element 610, a dielectric substrate 620, a first radiating portion 630, a second radiating portion 640, a third radiating portion 650, a fourth radiating portion 660, a fifth radiating portion 710, a sixth radiating portion 720, a seventh radiating portion 730, an eighth radiating portion 740, a ninth radiating portion 750, and a tenth radiating portion 760, wherein the grounding element 610, the first radiating portion 630, the second radiating portion 640, the third radiating portion 650, the fourth radiating portion 660, the fifth radiating portion 710, the sixth radiating portion 720, the seventh radiating portion 730, the eighth radiating portion 740, the ninth radiating portion 750, and the tenth radiating portion 760 can all be made of metal materials.

[0129] The dielectric substrate 620 has a first surface E5 and a second surface E6 opposite to each other, wherein the first radiating portion 630, the second radiating portion 640, the third radiating portion 650, and the fourth radiating portion 660 can be disposed on the first surface E5 of the dielectric substrate 620, and the fifth radiating portion 710, the sixth radiating portion 720, the seventh radiating portion 730, the eighth radiating portion 740, the ninth radiating portion 750, and the tenth radiating portion 760 can be disposed on the second surface E6 of the dielectric substrate 620. In addition, the grounding element 610 can extend to both the first surface E5 and the second surface E6 of the dielectric substrate 620.

[0130] The first radiating portion 630 may be substantially in the shape of a letter J. Specifically, the first radiating portion 630 has a first end 631 and a second end 632, wherein a first feeding point FP5 is located at the first end 631 of the first radiating portion 630, and the second end 632 of the first radiating portion 630 is an open end.

[0131] The second radiating portion 640 may be substantially in the shape of an inverted J. Specifically, the second radiating portion 640 has a first end 641 and a second end 642, wherein the first end 641 of the second radiating portion 640 is coupled to the ground element 610, and the second end 642 of the second radiating portion 640 is an open end. For example, the second end 642 of the second radiating portion 640 and the second end 632 of the first radiating portion 630 may extend in a direction close to each other.

[0132] The third radiating portion 650 may be substantially in the shape of a letter C. Specifically, the third radiating portion 650 has a first end 651 and a second end 652, wherein the first end 651 of the third radiating portion 650 is coupled to the first end 631 of the first radiating portion 630 and the first feeding point FP5, and the second end 652 of the third radiating portion 650 is an open end.

[0133] The fourth radiating portion 660 may be substantially in the shape of an inverted C. Specifically, the fourth radiating portion 660 has a first end 661 and a second end 662, wherein the first end 661 of the fourth radiating portion 660 is coupled to the first end 641 of the second radiating portion 640 and the grounding element 610, and the second end 662 of the fourth radiating portion 660 is an open end. For example, the second end 662 of the fourth radiating portion 660 and the second end 652 of the third radiating portion 650 may extend in a direction close to each other.

[0134] The fifth radiating portion 710 may be substantially in the shape of a straight strip. Specifically, the fifth radiating portion 710 has a first end 711 and a second end 712 , wherein a second feeding point FP6 is located at the first end 711 of the fifth radiating portion 710 .

[0135] The sixth radiating portion 720 may be substantially L-shaped. Specifically, the sixth radiating portion 720 has a first end 721 and a second end 722, wherein the first end 721 of the sixth radiating portion 720 is coupled to the second end 712 of the fifth radiating portion 710, and the second end 722 of the sixth radiating portion 720 is an open end, which may extend toward the direction close to the ground element 610. In addition, the first radiating portion 630 has a vertical projection on the second surface E6 of the dielectric substrate 620, and the vertical projection of the first radiating portion 630 may at least partially overlap with the fifth radiating portion 710 and the sixth radiating portion 720.

[0136] The seventh radiating portion 730 may be substantially in the shape of a straight strip, and may be substantially perpendicular to the fifth radiating portion 710. Specifically, the seventh radiating portion 730 has a first end 731 and a second end 732, wherein the first end 731 of the seventh radiating portion 730 is coupled to the second end 712 of the fifth radiating portion 710, and the second end 732 of the seventh radiating portion 730 is an open end, which may extend in a direction away from the fifth radiating portion 710. In addition, the third radiating portion 650 has a vertical projection on the second surface E6 of the dielectric substrate 620, and the vertical projection of the third radiating portion 650 at least partially overlaps with the seventh radiating portion 730.

[0137] The eighth radiating portion 740 may be substantially in the shape of a straight strip. Specifically, the eighth radiating portion 740 has a first end 741 and a second end 742 , wherein a third feeding point FP7 is located at the first end 741 of the eighth radiating portion 740 .

[0138] The ninth radiating portion 750 may be substantially U-shaped. Specifically, the ninth radiating portion 750 has a first end 751 and a second end 752, wherein the first end 751 of the ninth radiating portion 750 is coupled to the second end 742 of the eighth radiating portion 740, and the second end 752 of the ninth radiating portion 750 is an open end, which may extend toward the direction close to the ground element 610. In addition, the second radiating portion 640 has a vertical projection on the second surface E6 of the dielectric substrate 620, and the vertical projection of the second radiating portion 640 may at least partially overlap with the eighth radiating portion 740 and the ninth radiating portion 750. In some embodiments, the ninth radiating portion 750 further includes a terminal bent portion 758, which is adjacent to the second end 752 of the ninth radiating portion 750.

[0139] The tenth radiating portion 760 may be substantially L-shaped. Specifically, the tenth radiating portion 760 has a first end 761 and a second end 762, wherein the first end 761 of the tenth radiating portion 760 is coupled to the second end 742 of the eighth radiating portion 740, and the second end 762 of the tenth radiating portion 760 is an open end, which may extend in a direction away from the grounding element 610. In some embodiments, the tenth radiating portion 760 further includes a first widening portion 765 and a second widening portion 766, which may each be a narrow and long rectangle, so that the tenth radiating portion 760 becomes an unequal width structure. For example, the first widening portion 765 may be adjacent to the third feeding point FP7, and the second widening portion 766 may be substantially perpendicular to the first widening portion 765. In addition, the fourth radiating portion 660 has a vertical projection on the second surface E6 of the dielectric substrate 620, and the vertical projection of the fourth radiating portion 660 at least partially overlaps with the tenth radiating portion 760.

[0140] Figure 6C is a schematic diagram showing a switching circuit 770 and a signal source 790 according to an embodiment of the present invention. Figure 6C In the embodiment of the present invention, the antenna structure 600 further includes a switching circuit 770 and a signal source 790. The switching circuit 770 can couple the signal source 790 to one of the first feeding point FP5, the second feeding point FP6, or the third feeding point FP7 according to a control signal SC3.

[0141] Fig. 7A 1 is a graph showing the return loss of the antenna structure 600 according to an embodiment of the present invention when the switching circuit 770 is switched to the first feeding point FP5 . Figure 7B 1 is a diagram showing the return loss of the antenna structure 600 according to an embodiment of the present invention when the switching circuit 770 is switched to the second feeding point FP6 . Figure 7C is a graph showing the return loss of the antenna structure 600 according to an embodiment of the present invention when the switching circuit 770 switches to the third feeding point FP7. Fig. 7A , Figure 7B , Figure 7C According to the measurement results, the antenna structure 600 can cover a first frequency band FB7, a second frequency band FB8, and a third frequency band FB9. For example, the first frequency band FB7 may be between 2400MHz and 2500MHz, the second frequency band FB8 may be between 5150MHz and 5850MHz, and the third frequency band FB9 may be between 5925MHz and 7125MHz. Therefore, the antenna structure 600 will at least support the broadband operation of traditional WLAN 2.4GHz / 5GHz and the new generation Wi-Fi 6E. In addition, the radiation efficiency of the antenna structure 600 in the aforementioned first frequency band FB7, second frequency band FB8, and third frequency band FB9 can reach more than 35%, which can meet the actual application requirements of general mobile communication devices.

[0142] In terms of antenna principle, the first radiating portion 630, the second radiating portion 640, the fifth radiating portion 710, the sixth radiating portion 720, the eighth radiating portion 740, and the ninth radiating portion 750 can jointly excite to generate the aforementioned first frequency band FB7. The third radiating portion 650, the fourth radiating portion 660, the fifth radiating portion 710, the seventh radiating portion 730, the eighth radiating portion 740, and the tenth radiating portion 760 can jointly excite to generate the aforementioned second frequency band FB8 and the third frequency band FB9. In addition, the first widening portion 765 and the second widening portion 766 can also be used to fine-tune the impedance matching of the third frequency band FB9, thereby increasing the operating bandwidth of the third frequency band FB9.

[0143] In some embodiments, the element dimensions and element parameters of the antenna structure 600 may be as follows. The length L13 of the first radiating portion 630 may be between 0.25 times and 0.3 times the wavelength (0.25λ~0.3λ) of the first frequency band FB7 of the antenna structure 600, for example, it may be approximately 0.25 times the wavelength (0.25λ). The length L14 of the second radiating portion 640 may be between 0.25 times and 0.3 times the wavelength (0.25λ~0.3λ) of the first frequency band FB7 of the antenna structure 600, for example, it may be approximately 0.25 times the wavelength (0.25λ). The distance D3 between the first end 631 of the first radiating portion 630 and the first end 641 of the second radiating portion 640 may be less than 0.25 times the wavelength (0.25λ) of the first frequency band FB7 of the antenna structure 600. The length L15 of the third radiating portion 650 may be between 0.25 times and 0.3 times the wavelength (0.25λ~0.3λ) of the second frequency band FB8 of the antenna structure 600, for example, it may be approximately 0.25 times the wavelength (0.25λ). The length L16 of the fourth radiating portion 660 may be between 0.25 times and 0.3 times the wavelength (0.25λ~0.3λ) of the second frequency band FB8 of the antenna structure 600, for example, it may be approximately 0.25 times the wavelength (0.25λ). The total length L17 of the fifth radiating portion 710 and the sixth radiating portion 720 may be approximately equal to 0.2 times the wavelength of the first frequency band FB7 of the antenna structure 600. The total length L18 of the fifth radiating portion 710 and the seventh radiating portion 730 may be approximately equal to 0.2 times the wavelength (0.2λ) of the second frequency band FB8 of the antenna structure 600. The total length L19 of the eighth radiating portion 740 and the ninth radiating portion 750 may be between 0.2 times and 0.25 times the wavelength (0.25λ~0.3λ) of the first frequency band FB7 of the antenna structure 600, for example, may be approximately 0.25 times the wavelength (0.25λ). The total length L20 of the eighth radiating portion 740 and the tenth radiating portion 760 may be approximately equal to 0.3 times the wavelength (0.3λ) of the second frequency band FB8 of the antenna structure 600. The spacing D4 between the second end 732 of the seventh radiating portion 730 and the second widened portion 766 of the tenth radiating portion 760 may be greater than or equal to 2 mm. The above dimensions and parameter ranges are obtained based on multiple experimental results, which help to optimize the operating bandwidth and impedance matching of the antenna structure 600. Fig. 6A , Figure 6B , Figure 6C The remaining features of the antenna structure 600 are similar to Figure 1A , Figure 1B , Figure 1C , Figure 1D The antenna structure 100 is similar, so the two embodiments can achieve similar operating effects.

[0144] The present invention proposes a novel antenna structure. Compared with the conventional technology, the present invention has at least the advantages of small size, wide bandwidth, low manufacturing cost, and near omnidirectionality, so it is very suitable for application in various communication devices.

[0145] It is worth noting that the above-mentioned element size, element shape, element parameters, and frequency range are not limiting conditions of the present invention. Antenna designers can adjust these settings according to different needs. The antenna structure of the present invention is not limited to Figure 1A to Figure 7C The present invention may only include Figure 1A to Figure 7C In other words, not all the features shown in the figures need to be implemented in the antenna structure of the present invention at the same time.

[0146] In the present specification and claims, ordinal numbers, such as "first", "second", "third", etc., have no sequential relationship with each other, and are only used to distinguish two different components with the same name.

[0147] Although the present invention is disclosed in conjunction with the above preferred embodiments, it is not intended to limit the scope of the present invention. Anyone familiar with this technology may make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the definition of the attached claims.

Claims

1. An antenna structure, characterized in that: include: Grounding element; A dielectric substrate having a first surface and a second surface opposite to each other; A first radiating portion having a first feeding point; A second radiating portion coupled to the ground element; A third radiating portion, coupled to the first feeding point; a fourth radiating portion coupled to the grounding element, wherein the first radiating portion, the second radiating portion, the third radiating portion, and the fourth radiating portion are all disposed on the first surface of the dielectric substrate; A fifth radiating portion having a second feeding point; a sixth radiation portion, coupled to the fifth radiation portion; as well as a seventh radiation portion coupled to the fifth radiation portion, wherein the fifth radiation portion, the sixth radiation portion, and the seventh radiation portion are all disposed on the second surface of the dielectric substrate, The antenna structure covers a first frequency band between 2400 MHz and 2500 MHz, and the length of the first radiating portion is between 0.25 times and 0.3 times the wavelength of the first frequency band.

2. The antenna structure according to claim 1, further comprising: Signal source; as well as The switching circuit couples the signal source to the first feeding point or the second feeding point according to a control signal. 3 . The antenna structure as claimed in claim 1 , wherein the third radiating portion and the fourth radiating portion are both between the first radiating portion and the second radiating portion. 4 . The antenna structure as claimed in claim 1 , wherein the antenna structure further covers a second frequency band and a third frequency band, the second frequency band is between 5150 MHz and 5850 MHz, and the third frequency band is between 5925 MHz and 7125 MHz. The antenna structure as claimed in claim 4 , wherein the first radiating portion is in a J-shape. 6 . The antenna structure as claimed in claim 4 , wherein the second radiating portion is in an inverted J-shape, and a length of the second radiating portion is between 0.25 times and 0.3 times the wavelength of the first frequency band. 7 . The antenna structure as claimed in claim 4 , wherein a distance between the first radiating portion and the second radiating portion is less than 0.25 times the wavelength of the first frequency band. 8 . The antenna structure as claimed in claim 4 , wherein the third radiating portion is C-shaped, and a length of the third radiating portion is between 0.25 times and 0.3 times the wavelength of the second frequency band. 9 . The antenna structure as claimed in claim 4 , wherein the fourth radiating portion is in an inverted C-shape, and a length of the fourth radiating portion is between 0.25 times and 0.3 times the wavelength of the second frequency band. 10 . The antenna structure as claimed in claim 4 , wherein the sixth radiating portion is U-shaped, and a total length of the fifth radiating portion and the sixth radiating portion is between 0.2 and 0.25 times the wavelength of the first frequency band. The antenna structure as claimed in claim 4 , wherein the sixth radiating portion further comprises a first widened portion. 12 . The antenna structure as claimed in claim 4 , wherein the seventh radiating portion is L-shaped, and a total length of the fifth radiating portion and the seventh radiating portion is equal to 0.3 times the wavelength of the second frequency band. 13 . The antenna structure as claimed in claim 4 , wherein the seventh radiating portion further comprises a second widened portion. 14 . The antenna structure as claimed in claim 4 , wherein the sixth radiating portion is L-shaped, and a total length of the fifth radiating portion and the sixth radiating portion is equal to 0.2 times the wavelength of the first frequency band. 15 . The antenna structure as claimed in claim 4 , wherein the seventh radiating portion is in a straight strip shape, and a total length of the fifth radiating portion and the seventh radiating portion is equal to 0.2 times the wavelength of the second frequency band.

16. The antenna structure of claim 4, further comprising: an eighth radiating portion having a third feeding point; a ninth radiation portion, coupled to the eighth radiation portion; as well as The tenth radiation portion is coupled to the eighth radiation portion, wherein the eighth radiation portion, the ninth radiation portion, and the tenth radiation portion are all disposed on the second surface of the dielectric substrate.

17. The antenna structure of claim 16, further comprising: Signal source; as well as The switching circuit couples the signal source to the first feeding point, the second feeding point, or the third feeding point according to a control signal. 18 . The antenna structure as claimed in claim 16 , wherein the ninth radiating portion is U-shaped, and a total length of the eighth radiating portion and the ninth radiating portion is between 0.2 and 0.25 times the wavelength of the first frequency band. 19 . The antenna structure as claimed in claim 16 , wherein the tenth radiating portion is L-shaped, and a total length of the eighth radiating portion and the tenth radiating portion is equal to 0.3 times the wavelength of the second frequency band.

20. The antenna structure as claimed in claim 16, wherein the tenth radiating portion further comprises a first widened portion and a second widened portion.

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