Antenna device

Abstract

An antenna device includes a dielectric substrate and a first ground plane, a second ground plane, and a third ground plane disposed on a first surface of the dielectric substrate and isolated from each other; a first main antenna and a first auxiliary antenna disposed on the first surface and interacting with the first ground plane to operate in a first frequency range and isolated from each other; a second main antenna and a second auxiliary antenna interacting with the first ground plane to operate in a second frequency range and isolated from each other; a third main antenna interacting with the second ground plane to operate in a third frequency range; and a third auxiliary antenna interacting with the third ground plane to operate in a third frequency range.

Description

Technical Field

[0001] This invention relates to an antenna, and more particularly to an antenna device that integrates a multi-functional antenna. Background Technology

[0002] With the market's ever-increasing demand for communication, fifth-generation (5G) mobile communication is booming and rapidly becoming widespread. Meanwhile, the demand for the integration of mobile communication, Wi-Fi communication, and GPS navigation in automotive, medical, and IoT devices is also becoming increasingly widespread. Therefore, the requirements of these multiple communication standards pose new challenges to antenna design. Furthermore, to improve the communication capacity, data transmission speed, and multipath fading resistance of communication systems, multi-input multi-output (MIMO) systems, which utilize multiple antennas for simultaneous communication at both the transmitting and receiving ends, have become a key technology.

[0003] MIMO communication in mobile terminals requires at least two antennas (a primary antenna and a secondary antenna), and to ensure isolation between them, the antenna size is typically required to be as large as possible. However, mobile communication terminals are generally small, and even vehicle-mounted antennas are limited by space constraints, necessitating a smaller antenna size. Furthermore, 5G antennas need to be compatible with 2G, 3G, and Sub-6G frequency bands, resulting in a wider antenna bandwidth and requiring a larger antenna size. This creates a contradiction: on the one hand, higher performance necessitates a larger antenna size; on the other hand, practical applications require a smaller antenna size. Currently, 5G MIMO antennas are either too large or require separate primary and secondary antennas, increasing overall manufacturing and installation costs. Alternatively, antenna size can be reduced by lowering performance, but this significantly reduces isolation between the primary and secondary antennas, hindering improvements in overall data throughput. Summary of the Invention

[0004] Therefore, the object of the present invention is to provide an antenna device that integrates multiple antennas and takes into account both antenna size and antenna performance, so as to provide a small-size multi-antenna that meets the requirements of multi-band and high isolation.

[0005] Therefore, the antenna device of the present invention includes a circuit board, the circuit board comprising: a dielectric substrate having a first surface; a first main antenna and a first auxiliary antenna operating in a first frequency range, respectively disposed on the first surface of the dielectric substrate and isolated from each other; a second main antenna and a second auxiliary antenna operating in a second frequency range, respectively disposed on the first surface of the dielectric substrate and isolated from each other; a third main antenna and a third auxiliary antenna operating in a third frequency range, respectively disposed on the first surface of the dielectric substrate and isolated from each other; and a grounding unit including a grounding unit disposed on the first surface of the dielectric substrate. Furthermore, there are a first ground plane, a second ground plane, and a third ground plane that are isolated from each other. The first ground plane is located between the first main antenna and the first auxiliary antenna, separating the first main antenna and the first auxiliary antenna, and works together with the first main antenna and the first auxiliary antenna. The second ground plane is adjacent to the third main antenna and works together with the third main antenna. The third ground plane is adjacent to the third auxiliary antenna and works together with the third auxiliary antenna.

[0006] In some embodiments of the present invention, the first ground plane is provided with a first main grounding portion, a first auxiliary grounding portion, a second main grounding portion, and a second auxiliary grounding portion. The first main antenna has a first main feed portion adjacent to and surrounded by the first ground plane and spaced apart from the first ground plane. The first auxiliary antenna has a first auxiliary feed portion adjacent to and surrounded by the first ground plane and spaced apart from the first ground plane. The second main antenna has a first auxiliary feed portion adjacent to and surrounded by the second main grounding portion and spaced apart from the first ground plane. The second auxiliary antenna has a second main feed portion that is adjacent to the second auxiliary ground portion and surrounded by the first ground plane and spaced apart from the first ground plane; the second ground plane has a third main ground portion, and the third main antenna has a third main feed portion that is adjacent to the third main ground portion and surrounded by the second ground plane and spaced apart from the second ground plane; the third ground plane has a third auxiliary ground portion, and the third auxiliary antenna has a third auxiliary feed portion that is adjacent to the third auxiliary ground portion and surrounded by the third ground plane and spaced apart from the third ground plane.

[0007] In some embodiments of the present invention, the first main feed section and the first main ground section are respectively used for soldering an inner conductor and an outer conductor of a first radio frequency transmission line; the first auxiliary feed section and the first auxiliary ground section are respectively used for soldering an inner conductor and an outer conductor of a second radio frequency transmission line; the second main feed section and the second main ground section are respectively used for soldering an inner conductor and an outer conductor of a third radio frequency transmission line; the second auxiliary feed section and the second auxiliary ground section are respectively used for soldering an inner conductor and an outer conductor of a fourth radio frequency transmission line; the third main feed section and the third main ground section are respectively used for soldering an inner conductor and an outer conductor of a fifth radio frequency transmission line; and the third auxiliary feed section and the third auxiliary ground section are respectively used for soldering an inner conductor and an outer conductor of a sixth radio frequency transmission line.

[0008] In some embodiments of the present invention, the dielectric substrate has a first side and a second side that define the edge of the dielectric substrate and are opposite to each other, and a third side and a fourth side that are connected to and opposite to the first side and the second side. The first main antenna is located at the corner formed by the first side and the third side, the first auxiliary antenna is located at the corner formed by the first side and the fourth side, the second main antenna is close to the first side and is located between the first main antenna and the first auxiliary antenna, the second auxiliary antenna is close to the fourth side and is located between the first auxiliary antenna and the third auxiliary antenna, the third main antenna is located at the corner formed by the second side and the third side, and the third auxiliary antenna is located at the corner formed by the second side and the fourth side.

[0009] In some embodiments of the present invention, the first main antenna includes a first main monopole antenna connected to the first main feed section, and a first main parasitic antenna extending outward from the first ground plane and spaced apart from and adjacent to the first main monopole antenna and electrically coupled to each other; the first auxiliary antenna includes a first auxiliary monopole antenna connected to the first auxiliary feed section and a first auxiliary parasitic antenna extending outward from the first ground plane and spaced apart from and adjacent to the first auxiliary monopole antenna and electrically coupled to each other; the second main antenna includes a second main monopole antenna connected to the second main feed section; the second auxiliary antenna includes a second auxiliary monopole antenna connected to the second auxiliary feed section; the third main antenna includes a third main monopole antenna connected to the third main feed section; and the third auxiliary antenna includes a third auxiliary monopole antenna connected to the third auxiliary feed section.

[0010] In some embodiments of the present invention, the first main monopole antenna further includes a first microstrip line, which extends outward from the first main monopole antenna and passes through the first ground plane at intervals and connects to the first main feed section; the first auxiliary monopole antenna further includes a second microstrip line, which extends outward from the first auxiliary monopole antenna and passes through the first ground plane at intervals and connects to the first auxiliary feed section; the second main monopole antenna further includes a third microstrip line, which extends outward from the second main monopole antenna and passes through the first ground plane at intervals and connects to the first auxiliary feed section. The second main feed section; the second auxiliary monopole antenna further includes a fourth microstrip line, which extends outward from the second auxiliary monopole antenna and passes through the first ground plane at intervals and connects to the second auxiliary feed section; the third main monopole antenna further includes a fifth microstrip line, which extends outward from the third main monopole antenna and passes through the second ground plane at intervals and connects to the third main feed section; the third auxiliary monopole antenna further includes a sixth microstrip line, which extends outward from the third auxiliary monopole antenna and passes through the third ground plane at intervals and connects to the third auxiliary feed section.

[0011] In some embodiments of the present invention, the dielectric substrate further has a second surface opposite to the first surface, and the grounding unit further includes a first extended ground surface, a second extended ground surface, and a third extended ground surface disposed on the second surface of the dielectric substrate. The first extended ground surface corresponds to the first ground surface and a plurality of through holes electrically connecting the two are formed therebetween; the second extended ground surface corresponds to the second ground surface and a plurality of through holes electrically connecting the two are formed therebetween; the third extended ground surface corresponds to the third ground surface and a plurality of through holes electrically connecting the two are formed therebetween.

[0012] In some embodiments of the present invention, a plurality of through-holes electrically connecting the first ground plane and the first extended ground plane are formed between the first ground plane and the first extended ground plane, surrounding the first main feed portion and extending along both sides of the first microstrip line; a plurality of through-holes electrically connecting the first ground plane and the first extended ground plane are formed around the first auxiliary feed portion and extending along both sides of the second microstrip line; a plurality of through-holes electrically connecting the first ground plane and the first extended ground plane are formed around the second main feed portion and extending along both sides of the third microstrip line; and a plurality of through-holes surrounding the first auxiliary feed portion and extending along both sides of the second microstrip line are formed around the first auxiliary feed portion and extending along both sides of the second microstrip line. A plurality of through holes electrically connecting the first ground plane and the first extended ground plane are formed between the second auxiliary feed section and the second extended ground plane, extending along both sides of the fourth microstrip line; a plurality of through holes electrically connecting the second ground plane and the second extended ground plane are formed between the second ground plane and the second extended ground plane, surrounding the third main feed section and extending along both sides of the fifth microstrip line; a plurality of through holes electrically connecting the third ground plane and the third extended ground plane are formed between the third ground plane and the third extended ground plane, surrounding the third auxiliary feed section and extending along both sides of the sixth microstrip line.

[0013] In some embodiments of the present invention, the first extended ground plane is provided with a first main grounding pad, a first auxiliary grounding pad, a second main grounding pad, and a second auxiliary grounding pad. A first main feed pad is provided on the second surface, adjacent to the first main grounding pad and surrounded by the first extended ground plane, and spaced apart from the first extended ground plane. A first auxiliary feed pad is provided on the second surface, adjacent to the first auxiliary grounding pad and surrounded by the first extended ground plane, and spaced apart from the first extended ground plane. A second main feed pad is provided on the second surface, adjacent to the second main grounding pad and surrounded by the first extended ground plane, and spaced apart from the first extended ground plane. A second auxiliary feed pad is provided, adjacent to the second auxiliary grounding pad and surrounded by and spaced apart from the first extended ground plane; a third main grounding pad is provided in the second extended ground plane, and a third main feed pad is provided on the second surface, adjacent to the third main grounding pad and surrounded by and spaced apart from the second extended ground plane; a third auxiliary grounding pad is provided in the third extended ground plane, and a third auxiliary feed pad is provided on the second surface, adjacent to the third auxiliary grounding pad and surrounded by and spaced apart from the third extended ground plane; wherein, the first main feed pad corresponds to the first main feed portion and a gap is formed between them. Multiple through-holes electrically connecting the two are formed between the first main grounding pad and the first main grounding portion; the first auxiliary feed pad and the first auxiliary feed portion are corresponding to each other and multiple through-holes electrically connecting the two are formed between them; the first auxiliary grounding pad and the first auxiliary grounding portion are corresponding to each other and multiple through-holes electrically connecting the two are formed between them; the second main feed pad and the second main feed portion are corresponding to each other and multiple through-holes electrically connecting the two are formed between them; the second main grounding pad and the second main grounding portion are corresponding to each other and multiple through-holes electrically connecting the two are formed between them; the second auxiliary feed pad and the second auxiliary feed portion are corresponding to each other and multiple through-holes electrically connecting the two are formed between them; the second auxiliary feed pad and the second auxiliary feed portion are corresponding to each other and multiple through-holes electrically connecting the two are formed between them; the second auxiliary feed pad and the second auxiliary feed portion are corresponding to each other and multiple through-holes electrically connecting the two are formed between them. The feed inlet portion and the feed inlet portion are respectively connected by a plurality of through holes. The second auxiliary grounding pad and the second auxiliary grounding portion are respectively connected by a plurality of through holes. The third main feed inlet pad and the third main feed inlet portion are respectively connected by a plurality of through holes. The third main grounding pad and the third main grounding portion are respectively connected by a plurality of through holes. The third auxiliary feed inlet pad and the third auxiliary feed inlet portion are respectively connected by a plurality of through holes. The third auxiliary grounding pad and the third auxiliary grounding portion are respectively connected by a plurality of through holes.

[0014] In some embodiments of the present invention, the first primary feed pad is used to solder to an inner conductor of a first radio frequency transmission line, and the first primary ground pad is used to solder to an outer conductor of the first radio frequency transmission line that is insulated from the inner conductor; the first secondary feed pad is used to solder to an inner conductor of a second radio frequency transmission line, and the first secondary ground pad is used to solder to an outer conductor of the second radio frequency transmission line that is insulated from the inner conductor; the second primary feed pad is used to solder to an inner conductor of a third radio frequency transmission line, and the second primary ground pad is used to solder to an outer conductor of the third radio frequency transmission line that is insulated from the inner conductor. The outer conductor is soldered; the second auxiliary feed pad is used to solder to an inner conductor of a fourth RF transmission line, and the second auxiliary ground pad is used to solder to an outer conductor of the fourth RF transmission line that is insulated from the inner conductor; the third main feed pad is used to solder to an inner conductor of a fifth RF transmission line, and the third main ground pad is used to solder to an outer conductor of the fifth RF transmission line that is insulated from the inner conductor; the third auxiliary feed pad is used to solder to an inner conductor of a sixth RF transmission line, and the third auxiliary ground pad is used to solder to an outer conductor of the sixth RF transmission line that is insulated from the inner conductor.

[0015] In some embodiments of the present invention, the antenna device further includes a housing that houses the circuit board and at least one elastic plug that fills at least one opening in the housing, and the first to sixth radio frequency transmission lines pass through the at least one opening into the housing, and the at least one elastic plug is for the first to sixth radio frequency transmission lines to pass through, so as to fix the first to sixth radio frequency transmission lines on the housing.

[0016] In some embodiments of the present invention, the antenna device further includes a global navigation satellite system antenna, which includes a sub-circuit board separate from the circuit board and a ceramic dielectric antenna operating in a fourth frequency range, the ceramic dielectric antenna being disposed on one side of the sub-circuit board.

[0017] In some embodiments of the present invention, the ceramic dielectric antenna has a feed pin, and the side of the sub-circuit board is provided with a ground portion. The feed pin and the ground portion are respectively electrically connected to an inner conductor and an outer conductor of a seventh radio frequency transmission line.

[0018] In some embodiments of the present invention, the global satellite navigation system antenna further includes a low-noise amplifier circuit disposed on the other side of the sub-circuit board. The ceramic dielectric antenna is electrically connected to the low-noise amplifier circuit through a feed pin passing through the sub-circuit board. A feed terminal of the low-noise amplifier circuit is electrically connected to an inner conductor of a seventh radio frequency transmission line. An outer conductor of the seventh radio frequency transmission line, which is insulated from the inner conductor, is electrically connected to a grounding pad formed on the other side. The grounding pad is conductive to a grounding portion disposed on the surface of the sub-circuit board.

[0019] In some embodiments of the present invention, the antenna device further includes a global satellite navigation system antenna disposed on the dielectric substrate, the global satellite navigation system antenna including a ceramic dielectric antenna operating in a fourth frequency range, the ceramic dielectric antenna being disposed on the first surface of the dielectric substrate.

[0020] In some embodiments of the present invention, the ceramic dielectric antenna has a feed pin, and the first surface of the dielectric substrate is provided with a ground portion. The feed pin and the ground portion are respectively electrically connected to an inner conductor and an outer conductor of a seventh radio frequency transmission line.

[0021] In some embodiments of the present invention, the global satellite navigation system antenna further includes a low-noise amplifier circuit disposed on the second surface of the dielectric substrate. The ceramic dielectric antenna is electrically connected to the low-noise amplifier circuit through a feed pin passing through the dielectric substrate. A feed terminal of the low-noise amplifier circuit is electrically connected to an inner conductor of a seventh radio frequency transmission line. An outer conductor of the seventh radio frequency transmission line, which is insulated from the inner conductor, is electrically connected to a grounding pad formed on the second surface. The grounding pad is conductive to a grounding portion disposed on the first surface.

[0022] In some embodiments of the present invention, the first main antenna, the first auxiliary antenna, the second main antenna, the second auxiliary antenna, the third main antenna, the third auxiliary antenna, the grounding unit, and the first to the sixth microstrip lines are respectively formed from copper foil printed on the first and second surfaces of the dielectric substrate.

[0023] In some embodiments of the present invention, the first main antenna is an LTE / 5G broadband main antenna, the first auxiliary antenna is an LTE / 5G broadband auxiliary antenna, the second main antenna is a WiFi broadband main antenna, the second auxiliary antenna is a WiFi broadband secondary antenna, the third main antenna is a 5G broadband main antenna, and the third auxiliary antenna is a 5G broadband secondary antenna.

[0024] The advantages of this invention are: it integrates multiple antennas onto a single small-sized circuit board and enables the antenna to have good radiation performance and high isolation, solving the problem that traditional multi-antenna designs cannot simultaneously meet the requirements of small size, multi-band operation, and high isolation. Attached Figure Description

[0025] Other features and effects of the present invention will be clearly shown in the embodiments with reference to the accompanying drawings, wherein:

[0026] Figure 1 This is a schematic diagram of the first side of the circuit board structure according to an embodiment of the antenna device of the present invention;

[0027] Figure 2This is a schematic diagram of the second side structure of the circuit board in this embodiment;

[0028] Figure 3 This is a schematic diagram showing the connection between the second side of the circuit board and multiple radio frequency transmission lines in this embodiment;

[0029] Figure 4 This is a schematic diagram of the ceramic dielectric antenna setup for the GNSS antenna in this embodiment;

[0030] Figure 5 This is a schematic diagram of the low-noise amplifier circuit setup for the GNSS antenna in this embodiment;

[0031] Figure 6 This is a schematic diagram of the circuit board housed within a housing in this embodiment;

[0032] Figure 7 The circuit board in this embodiment is Figure 4 A schematic diagram of the sealed outer casing;

[0033] Figure 8 This embodiment displays the return loss data of each antenna in its operating frequency band;

[0034] Figure 9 This embodiment displays the radiation performance data of each antenna in its operating frequency band; and

[0035] Figures 10 to 12 This embodiment displays the isolation data between antennas.

[0036] The attached figures are labeled as follows:

[0037] 1: Circuit board

[0038] 100: Dielectric substrate

[0039] 101: First Page

[0040] 102: Second Page

[0041] 1021: Grounding solder pad

[0042] 103: First side

[0043] 104: Second side

[0044] 105: Third side

[0045] 106: Fourth side

[0046] 11: First main antenna

[0047] 111: First main monopole antenna

[0048] 112: First primary parasitic antenna

[0049] 113: First microstrip line

[0050] 12: First auxiliary antenna

[0051] 121: First Auxiliary Monopole Antenna

[0052] 122: First Auxiliary Parasitic Antenna

[0053] 123: Second microstrip line

[0054] 13: Second main antenna

[0055] 131: Second main monopole antenna

[0056] 132: Third microstrip line

[0057] 14: Second Auxiliary Antenna

[0058] 141: Second Auxiliary Monopole Antenna

[0059] 142: Fourth microstrip line

[0060] 15: Third main antenna

[0061] 151: Third main monopole antenna

[0062] 152: Fifth microstrip line

[0063] 16: Third auxiliary antenna

[0064] 161: Third auxiliary monopole antenna

[0065] 162: Sixth microstrip line

[0066] 17: Grounding Unit

[0067] 171: First Ground Surface

[0068] 110: First main feed section

[0069] 1712: First main grounding part

[0070] 120: First auxiliary feed section

[0071] 1714: First auxiliary grounding part

[0072] 130: Second main feed unit

[0073] 1716: Second main grounding section

[0074] 140: Second auxiliary feed section

[0075] 1718: Second auxiliary grounding part

[0076] 172: Second ground contact

[0077] 150: Third main feed unit

[0078] 1722: Third main grounding section

[0079] 173: Third landing surface

[0080] 160: Third auxiliary feed section

[0081] 1732: Third auxiliary grounding part

[0082] 174: First extended ground surface

[0083] 181: First main feed pad

[0084] 1742: First main grounding pad

[0085] 182: First auxiliary feed pad

[0086] 1744: First auxiliary grounding pad

[0087] 183: Second main feed pad

[0088] 1746: Second main grounding pad

[0089] 184: Second auxiliary feed pad

[0090] 1748: Second auxiliary grounding pad

[0091] 175: Second extension ground surface

[0092] 185: Third main feed pad

[0093] 1752: Third main grounding pad

[0094] 176: Third extension ground surface

[0095] 186: Third auxiliary feed pad

[0096] 1762: Third auxiliary grounding pad

[0097] 170, 177, 178: Through holes

[0098] 2: Global Navigation Satellite System (GNSS) Antenna

[0099] 20: Sub-circuit board

[0100] 200: Grounding part

[0101] 201: Grounding solder pad

[0102] 21: Ceramic Dielectric Antenna

[0103] 211: Power supply pin

[0104] 22: Low-noise amplifier circuit

[0105] 221: Feed-in end

[0106] 23, 25: foam

[0107] 24: Metal casing

[0108] 31: First radio frequency transmission line

[0109] 311: Inner conductor

[0110] 312: Outer conductor

[0111] 32: Second radio frequency transmission line

[0112] 321: Inner conductor

[0113] 322: Outer conductor

[0114] 33: Third radio frequency transmission line

[0115] 331: Inner conductor

[0116] 332: Outer conductor

[0117] 34: Fourth radio frequency transmission line

[0118] 341: Inner conductor

[0119] 342: Outer conductor

[0120] 35: Fifth radio frequency transmission line

[0121] 351: Inner conductor

[0122] 352: Outer conductor

[0123] 36: Sixth RF transmission line

[0124] 361: Inner conductor

[0125] 362: External Conductor

[0126] 37: Seventh Radio Frequency Transmission Line

[0127] 371: Inner conductor

[0128] 372: Outer conductor

[0129] 4: Outer shell

[0130] 41: First Opening

[0131] 42: First elastic plug

[0132] 43: Second opening

[0133] 44: Second elastic plug Detailed Implementation

[0134] Before the invention is described in detail, it should be noted that similar elements are represented by the same numbers in the following description.

[0135] See Figure 1 and Figure 2 As shown, one embodiment of the antenna device of the present invention includes a circuit board 1, which includes a dielectric substrate 100 having a first surface 101 and a second surface 102 opposite to each other; and the circuit board 1 further includes a first main antenna 11 and a first auxiliary antenna 12 operating in a first frequency range and respectively disposed on the first surface 101 of the dielectric substrate 100 and isolated from each other, a second main antenna 13 and a second auxiliary antenna 14 operating in a second frequency range and respectively disposed on the first surface 101 of the dielectric substrate 100 and isolated from each other, a third main antenna 15 and a third auxiliary antenna 16 operating in a third frequency range and respectively disposed on the first surface 101 of the dielectric substrate 100 and isolated from each other, and a grounding unit 17.

[0136] The grounding unit 17 includes a first ground plane 171, a second ground plane 172, and a third ground plane 173 disposed on the first surface 101 of the dielectric substrate 100 and isolated from each other, and a first extended ground plane 174, a second extended ground plane 175, and a third extended ground plane 176 disposed on the second surface 102 of the dielectric substrate 100. The first extended ground plane 174 corresponds to the first ground plane 171 and a plurality of through holes 170 electrically connecting the two are formed therebetween; the second extended ground plane 175 corresponds to the second ground plane 172 and a plurality of through holes 170 electrically connecting the two are formed therebetween; the third extended ground plane 176 corresponds to the third ground plane 173 and a plurality of through holes 170 electrically connecting the two are formed therebetween.

[0137] The first ground plane 171 is located between the first main antenna 11 and the first auxiliary antenna 12, separating the first main antenna 11 and the first auxiliary antenna 12, and works together with the first main antenna 11 and the first auxiliary antenna 12; the first ground plane 171 is located between the second main antenna 13 and the second auxiliary antenna 14, separating the second main antenna 13 and the second auxiliary antenna 14, and works together with the second main antenna 13 and the second auxiliary antenna 14; the second ground plane 172 is adjacent to the third main antenna 15 and works together with the third main antenna 15; and the third ground plane 173 is adjacent to the third auxiliary antenna 16 and works together with the third auxiliary antenna 16.

[0138] Specifically, the dielectric substrate 100 has a first side 103 and a second side 104 that define the edge of the dielectric substrate 100 and are opposite to each other, and a third side 105 and a fourth side 106 that are connected to and opposite to the first side 103 and the second side 104.

[0139] The first ground plane 171 is close to the first side 103 of the dielectric substrate 100 and is provided with 110 - first main ground portion 1712, 120 - first auxiliary ground portion 1714, 130 - second main ground portion 1716, and 140 - second auxiliary ground portion 1718. Furthermore, the first main antenna 11 has a first main feed-in portion 110 that is adjacent to the first main ground portion 1712, surrounded by the first ground plane 171, and spaced apart from the first ground plane 171; the first auxiliary antenna 12 has a first auxiliary feed-in portion 120 that is adjacent to the first auxiliary ground portion 1714, surrounded by the first ground plane 171, and spaced apart from the first ground plane 171; the second main antenna 13 has a second main feed-in portion 130 that is adjacent to the second main ground portion 1716, surrounded by the first ground plane 171, and spaced apart from the first ground plane 171; and the second auxiliary antenna 14 has a second auxiliary feed-in portion 140 that is adjacent to the second auxiliary ground portion 1718, surrounded by the first ground plane 171, and spaced apart from the first ground plane 171.

[0140] The second ground plane 172 is close to the second side 104 and the third side 105 of the dielectric substrate 100 and has a third main ground portion 1722 therein. The third main antenna 15 has a third main feed portion 150 that is adjacent to the third main ground portion 1722, surrounded by the second ground plane 172, and spaced apart from the second ground plane 172. The third ground plane 173 is close to the second side 104 and the fourth side 106 of the dielectric substrate 100 and has a third auxiliary ground portion 1732 therein. The third auxiliary antenna 16 has a third auxiliary feed portion 160 that is adjacent to the third auxiliary ground portion 1732, surrounded by the third ground plane 173, and spaced apart from the third ground plane 173.

[0141] The first main antenna 11 is generally located in the corner enclosed by the first side 103 and the third side 105, and includes a first main monopole antenna 111 connected to the first main feed 110, and a first main parasitic antenna 112 extending outward from the first ground plane 171 and spaced apart from and adjacent to the first main monopole antenna 111 and electrically coupled to each other; the first auxiliary antenna 12 is generally located in the corner enclosed by the first side 103 and the fourth side 106, and includes a first auxiliary monopole antenna 121 connected to the first auxiliary feed 120 and a first auxiliary parasitic antenna 122 extending outward from the first ground plane 171 and spaced apart from and adjacent to the first auxiliary monopole antenna 121 and electrically coupled to each other.

[0142] The second main antenna 13 is located near the first side 103 and between the first main antenna 11 and the first auxiliary antenna 12, and includes a second main monopole antenna 131 connected to the second main feed section 130; the second auxiliary antenna 14 is located near the fourth side 106 and between the first auxiliary antenna 12 and the third auxiliary antenna 16, and includes a second auxiliary monopole antenna 141 connected to the second auxiliary feed section 140.

[0143] The third main antenna 15 is located at the corner formed by the second side 104 and the third side 105, and includes a third main monopole antenna 151 connected to the third main feed 150; the third auxiliary antenna 16 is located at the corner formed by the second side 104 and the fourth side 106, and includes a third auxiliary monopole antenna 161 connected to the third auxiliary feed 160.

[0144] In this embodiment, the first main monopole antenna 111 further includes a first microstrip line 113, which extends outward from the first main monopole antenna 111 and passes through the first ground plane 171 at intervals and connects to the first main feed section 110; and the first auxiliary monopole antenna 121 further includes a second microstrip line 123, which extends outward from the first auxiliary monopole antenna 121 and passes through the first ground plane 171 at intervals and connects to the first auxiliary feed section 120.

[0145] The second main monopole antenna 131 further includes a third microstrip line 132, which extends outward from the second main monopole antenna 131 and passes through the first ground plane 171 at intervals and connects to the second main feed section 130; and the second auxiliary monopole antenna 141 further includes a fourth microstrip line 142, which extends outward from the second auxiliary monopole antenna 141 and passes through the first ground plane 171 at intervals and connects to the second auxiliary feed section 140.

[0146] The third main monopole antenna 151 further includes a fifth microstrip line 152, which extends outward from the third main monopole antenna 151 and passes through the second ground plane 172 at intervals and is connected to the third main feed section 150; the third auxiliary monopole antenna 161 further includes a sixth microstrip line 162, which extends outward from the third auxiliary monopole antenna 161 and passes through the third ground plane 173 at intervals and is connected to the third auxiliary feed section 160.

[0147] Furthermore, in this embodiment, the circuit board 1 is a printed circuit board, the dielectric substrate 100 is made of polytetrafluoroethylene vinyl board, and the aforementioned first main antenna 11, first auxiliary antenna 12, second main antenna 13, second auxiliary antenna 14, third main antenna 15, third auxiliary antenna 16, grounding unit 17, and the first to sixth microstrip lines 113, 123, 132, 142, 152, 162 are patterns with specific shapes formed by copper foil printed on the first surface 101 and the second surface 102 of the dielectric substrate 100, respectively.

[0148] Therefore, the first main monopole antenna 111 (including the first microstrip line 113) and the first main parasitic antenna 112, together with the first ground plane 171, constitute an LTE / 5G broadband main antenna operating in the first frequency range; the second main monopole antenna 121 (including the second microstrip line 123) and the second main parasitic antenna 122, together with the first ground plane 171, constitute an LTE / 5G broadband auxiliary antenna operating in the first frequency range; the second main monopole antenna 131 (including the third microstrip line 132), together with the first ground plane 171, constitutes an LTE / 5G broadband auxiliary antenna operating in the first frequency range. The second frequency range WiFi broadband main antenna, the second auxiliary monopole antenna 141 (including the fourth microstrip line 142) and the first ground plane 171 work together to form a WiFi broadband auxiliary antenna operating in the second frequency range; the third main monopole antenna 151 (including the fifth microstrip line 152) and the second ground plane 172 work together to form a 5G broadband main antenna operating in the third frequency range; the third auxiliary monopole antenna 161 (including the sixth microstrip line 162) and the third ground plane 173 work together to form a 5G broadband auxiliary antenna operating in the third frequency range. The first frequency range includes 600-960MHz, 1400-1550MHz, 1710-2690MHz, 3300-4200MHz, and 4400-5000MHz; the second frequency range includes 2400-2485MHz, 5150-5850MHz, and 5925-7125MHz; and the third frequency range includes 1400-1550MHz, 1710-2690MHz, 3300-4200MHz, and 4400-5000MHz.

[0149] Furthermore, a plurality of through holes 177 are formed between the first ground plane 171 and the first extended ground plane 174, surrounding the first main feed section 110 and extending along both sides of the first microstrip line 113, electrically connecting the first ground plane 171 and the first extended ground plane 174; a plurality of through holes 177 are formed around the first auxiliary feed section 120 and extending along both sides of the second microstrip line 123, electrically connecting the first ground plane 171 and the first extended ground plane 174; a plurality of through holes 177 are formed around the second main feed section 130 and extending along both sides of the third microstrip line 132, electrically connecting the first ground plane 171 and the first extended ground plane 174; and a plurality of through holes 177 are formed around the second auxiliary feed section 14. A plurality of through holes 177 extending along both sides of the fourth microstrip line 142 are electrically connected to the first ground plane 171 and the first extended ground plane 174; and a plurality of through holes 177 are formed between the second ground plane 172 and the second extended ground plane 175, surrounding the third main feed portion 150 and extending along both sides of the fifth microstrip line 152, electrically connected to the second ground plane 172 and the second extended ground plane 175; and a plurality of through holes 177 are formed between the third ground plane 173 and the third extended ground plane 176, surrounding the third auxiliary feed portion 160 and extending along both sides of the sixth microstrip line 162, electrically connected to the third ground plane 173 and the third extended ground plane 176. Furthermore, by isolating the multiple feed sections 110, 120, 130, 140, 150, and 160 from the corresponding multiple ground sections 1712, 1714, 1716, 1718, 1722, and 1732 through multiple through-holes 177 and extending them to both sides of the multiple microstrip lines 113, 123, 132, 142, 152, and 162, it is possible to ensure that the impedance of the multiple microstrip lines is maintained at 50 ohms and to prevent electromagnetic (EMC) interference.

[0150] In addition, such as Figure 2As shown, the first extended ground plane 174 is provided with a first main grounding pad 1742, a first auxiliary grounding pad 1744, a second main grounding pad 1746, and a second auxiliary grounding pad 1748; and the second surface 172 is provided with a first main feed pad 181 adjacent to the first main grounding pad 1742, surrounded by the first extended ground plane 174, and spaced apart from the first extended ground plane 174; the second surface 102 is provided with a first auxiliary grounding pad 1744 adjacent to the first auxiliary grounding pad 1744, surrounded by the first extended ground plane 174, and spaced apart from the first extended ground plane 174. The second surface 102 has a first auxiliary feed pad 182 spaced apart from the ground plane 174, and a second main feed pad 183 adjacent to the second main ground pad 1746, surrounded by the first extended ground plane 174, and spaced apart from the first extended ground plane 174. The second surface 102 also has a second auxiliary feed pad 184 adjacent to the second auxiliary ground pad 1748, surrounded by the first extended ground plane 174, and spaced apart from the first extended ground plane 174. The first main feed pad 181 is opposite to the first main feed portion 110. The first main grounding pad 1742 corresponds to the first main grounding portion 1712, and the two are electrically connected by a plurality of through holes 178; the first auxiliary feed pad 182 corresponds to the first auxiliary feed portion 120, and the two are electrically connected by a plurality of through holes 178; the first auxiliary grounding pad 1744 corresponds to the first auxiliary grounding portion 1714, and the two are electrically connected by a plurality of through holes 178; the second main feed pad 183 and the first auxiliary feed portion 120 are electrically connected by a plurality of through holes 178; the first auxiliary grounding pad 1744 corresponds to the first auxiliary grounding portion 1714, and the two are electrically connected by a plurality of through holes 178; the second main feed pad 183 and the first auxiliary feed portion 120 are electrically connected by a plurality of through holes 178; the first auxiliary grounding pad 1742 corresponds to the first auxiliary grounding portion 1714, and the two are electrically connected by a plurality of through holes 178; the first auxiliary grounding pad 1842 corresponds to the first auxiliary grounding portion 120, and the first auxiliary grounding pad 1744 corresponds to the first auxiliary grounding portion 1714, and the first auxiliary feed portion 1712 corresponds to the first auxiliary grounding portion 120, and the first auxiliary grounding pad 174 ... The second main feed portion 130 corresponds to and has a plurality of through holes 178 electrically connecting the two. The second main grounding pad 1746 corresponds to and has a plurality of through holes 178 electrically connecting the two. The second auxiliary feed pad 184 corresponds to and has a plurality of through holes 178 electrically connecting the two. The second auxiliary grounding pad 1748 corresponds to and has a plurality of through holes 178 electrically connecting the two.

[0151] And such as Figure 2As shown, a third main grounding pad 1752 is provided in the second extended ground plane 175, and a third main feed-in pad 185 is provided on the second surface 102, which is adjacent to the third main grounding pad 1752, surrounded by the second extended ground plane 175, and spaced apart from the second extended ground plane 175. A third auxiliary grounding pad 1762 is provided in the third extended ground plane 176, and a third auxiliary feed-in pad 186 is provided on the second surface 102, which is adjacent to the third auxiliary grounding pad 1762, surrounded by the third extended ground plane 176, and spaced apart from the third extended ground plane 176. The third main feed pad 185 corresponds to the third main feed portion 150 and a plurality of through holes 178 electrically connecting the two are formed therebetween; the third main ground pad 1752 corresponds to the third main ground portion 1722 and a plurality of through holes 178 electrically connecting the two are formed therebetween; the third auxiliary feed pad 186 corresponds to the third auxiliary feed portion 160 and a plurality of through holes 178 electrically connecting the two are formed therebetween; the third auxiliary ground pad 1762 corresponds to the third auxiliary ground portion 1732 and a plurality of through holes 178 electrically connecting the two are formed therebetween.

[0152] And such as Figure 3As shown, the first main feed pad 181 is used to solder to an inner conductor 311 of a first RF transmission line 31, and the first main ground pad 1742 is used to solder to an outer conductor 312 of the first RF transmission line 31 that is insulated from the inner conductor 311, to feed RF signals into and out of the first RF transmission line 31; the first auxiliary feed pad 182 is used to solder to an inner conductor 321 of a second RF transmission line 32, and the first auxiliary ground pad 1744 is used to solder to an outer conductor 322 of the second RF transmission line 32 that is insulated from the inner conductor 321, to feed RF signals into and out of the second RF transmission line 32; the second main feed pad 183 is used to solder to an inner conductor 331 of a third RF transmission line 33, and the second main ground pad 1746 is used to solder to an outer conductor 332 of the third RF transmission line 33 that is insulated from the inner conductor 331, to feed RF signals into and out of the third RF transmission line 33. 3; The second auxiliary feed pad 184 is used to solder to an inner conductor 341 of a fourth RF transmission line 34, and the second auxiliary ground pad 1748 is used to solder to an outer conductor 342 of the fourth RF transmission line 34 that is insulated from the inner conductor 341, so as to feed RF signals into and out of the fourth RF transmission line 34; The third main feed pad 185 is used to solder to an inner conductor 351 of a fifth RF transmission line 35, and the third main ground pad 1752 is used to solder to an outer conductor 352 of the fifth RF transmission line 35 that is insulated from the inner conductor 351, so as to feed RF signals into and out of the fifth RF transmission line 35; The third auxiliary feed pad 186 is used to solder to an inner conductor 361 of a sixth RF transmission line 36, and the third auxiliary ground pad 1762 is used to solder to an outer conductor 362 of the sixth RF transmission line 36 that is insulated from the inner conductor 361, so as to feed RF signals into and out of the sixth RF transmission line 36. Therefore, by converging all the first to sixth radio frequency transmission lines 31 to 36 on the second surface 102 of the circuit board 1, interference from the first to sixth radio frequency transmission lines 31 to 36 to the antenna formed on the first surface 101 can be avoided.

[0153] Furthermore, the first main antenna 11 and the first auxiliary antenna 12 are separated by the first ground plane 171, allowing the first main antenna 11 and the first auxiliary antenna 12 to operate independently and maintain a certain distance, thus effectively isolating them and ensuring good isolation between them in the first frequency range; and the second main antenna 13 and the second auxiliary antenna 14 are separated by the first ground plane 171, allowing the second main antenna 13 and the second auxiliary antenna 14 to operate independently and maintain a certain distance, thus effectively isolating them and ensuring good isolation between them in the second frequency range. Furthermore, by having the third main antenna 15 and the third auxiliary antenna 16 operate independently and completely isolated from each other while maintaining a certain distance, and by having the third main antenna 15 and the third auxiliary antenna 16 operate independently and completely isolated from the first main antenna 11, the first auxiliary antenna 12, the second main antenna 13, and the second auxiliary antenna 14 while maintaining a certain distance, and by having the first ground plane 171, the second ground plane 172, and the third ground plane 173 not connected to each other, the isolation between the third main antenna 15 and the third auxiliary antenna 16, as well as the isolation between the third main antenna 15 and the third auxiliary antenna 16 and the first main antenna 11, the first auxiliary antenna 12, the second main antenna 13, and the second auxiliary antenna 14, is improved.

[0154] In addition, such as Figures 1 to 5 As shown, this embodiment also includes a Global Navigation Satellite System (GNSS) antenna 2 detachably fixed to the circuit board 1. Because the GNSS antenna 2 contains components such as resistors and inductors, its manufacturing cost would be high if directly mounted on the circuit board 1. Therefore, to reduce manufacturing costs, the GNSS antenna 2 includes a sub-circuit board 20, a ceramic dielectric antenna 21 operating in a fourth frequency range, and a low-noise amplifier circuit 22. The ceramic dielectric antenna 21 is disposed on one side of the sub-circuit board 20 and located between the first ground plane 171, the second ground plane 172, and the third ground plane 173 of the circuit board 1. A grounding portion 200 is provided on this side of the sub-circuit board 20, and as shown... Figure 4 and Figure 6 As shown, a protective and buffering foam 23 is provided above the ceramic dielectric antenna 21; the low-noise amplifier circuit 22 is located on the other side of the sub-circuit board 20 and between the first extended ground plane 174, the second extended ground plane 175, and the third extended ground plane 176 of the circuit board 1, and as shown... Figure 5 As shown, the low-noise amplifier circuit 22 is covered by a metal shield 24 to block electromagnetic waves and a foam 25 for protection and buffering; and the ceramic dielectric antenna 21 is electrically connected to the low-noise amplifier circuit 22 through a feed pin 211 passing through the sub-circuit board 20. Figure 3As shown, a feed terminal 221 of the low-noise amplifier circuit 22 can be electrically connected to an inner conductor 371 of a seventh RF transmission line 37. An outer conductor 372 of the seventh RF transmission line 37, insulated from the inner conductor 371, and a grounding pad 201 formed on the sub-circuit board 20 and connected to the ground portion 200, and located on the other side of the sub-circuit board 20, are electrically connected to feed the RF signal received by the ceramic dielectric antenna 21 and amplified by the low-noise amplifier circuit 22 to the seventh RF transmission line 37. The fourth frequency range includes 1555-1610MHz. It is worth noting that the low-noise amplifier circuit 22 is not a necessary component and can be omitted depending on the actual application or requirements. Of course, in other embodiments, the GNSS antenna 2 can also be directly disposed in the circuit board 1, that is, the sub-circuit board 20 is integrated into the circuit board 1. In this case, the ceramic dielectric antenna 21 and the grounding portion 200 are disposed on the first surface 101 of the dielectric substrate 100, the low noise amplifier circuit 22 and the grounding pad 201 are disposed on the second surface 102 of the dielectric substrate 100, and the ceramic dielectric antenna 21 is electrically connected to the low noise amplifier circuit 22 through the feed pin 211 passing through the dielectric substrate 100.

[0155] In addition, such as Figures 3 to 7 As shown, the antenna device of this embodiment further includes a housing 4 for housing the circuit board 1, a first elastic plug 42 filled in a first opening 41 of the housing 4, and a second elastic plug 44 filled in a second opening 43 of the housing 4. The first, third, and fifth radio frequency transmission lines 31, 33, and 35 pass through the first opening 41 into the housing 4, and the first elastic plug 42 allows the first, third, and fifth radio frequency transmission lines 31, 33, and 35 to pass through, so as to fix the first, third, and fifth radio frequency transmission lines 31, 33, and 35 to the housing 4. The second, fourth, sixth, and seventh radio frequency transmission lines 32, 34, 36, and 37 pass through the second opening 43 into the housing 4, and the second elastic plug 44 allows the second, fourth, sixth, and seventh radio frequency transmission lines 32, 34, 36, and 37 to pass through, so as to fix the second, fourth, sixth, and seventh radio frequency transmission lines 32, 34, 36, and 37 to the housing 4. The outer casing 4 can be made of polycarbonate (PC) or thermoplastic synthetic polymer resin (ABS), and the external dimensions of the outer casing 4 are 160 mm x 115 mm x 22.5 mm. Therefore, it can be seen that the size of the antenna device in this embodiment is less than 160 mm x 115 mm x 22.5 mm.

[0156] See also Figure 8 As shown, in this embodiment, the return loss of the first main antenna 11, the first auxiliary antenna 12, the second main antenna 13, the second auxiliary antenna 14, the third main antenna 15, and the third auxiliary antenna 16 in their operating frequency bands is all less than -5dB, and see [reference needed]. Figure 9 As shown, the emissivity of the first main antenna 11, the first auxiliary antenna 12, the second main antenna 13, the second auxiliary antenna 14, the third main antenna 15, and the third auxiliary antenna 16 in their operating frequency bands mostly exceed 50%, indicating good radiation performance; furthermore, see... Figure 10 As shown, the isolation S21 between the first main antenna 11 and the first auxiliary antenna 12, the isolation S31 between the first main antenna 11 and the second main antenna 13, the isolation S41 between the first main antenna 11 and the second auxiliary antenna 14, the isolation S51 between the first main antenna 11 and the third main antenna 15, and the isolation S61 between the first main antenna 11 and the third auxiliary antenna 16 are all below -10dB; and as Figure 11 As shown, the isolation S32 between the first auxiliary antenna 12 and the second main antenna 13, the isolation S42 between the first auxiliary antenna 12 and the second auxiliary antenna 14, the isolation S52 between the first auxiliary antenna 12 and the third main antenna 15, the isolation S62 between the first auxiliary antenna 12 and the third auxiliary antenna 16, and the isolation S43 between the second main antenna 13 and the second auxiliary antenna 14 are all below -10dB; and as Figure 12 As shown, the isolation S53 between the second main antenna 13 and the third main antenna 15, the isolation S63 between the second main antenna 13 and the third auxiliary antenna 16, the isolation S54 between the second auxiliary antenna 14 and the third main antenna 15, the isolation S64 between the second auxiliary antenna 14 and the third auxiliary antenna 16, and the isolation S65 between the third main antenna 15 and the third auxiliary antenna 16 are almost all below -20dB, indicating that the antennas do have good isolation.

[0157] It is worth mentioning that, in other embodiments, the first to sixth microstrip lines 113, 123, 132, 142, 152, and 162 can be omitted, and the multiple feed portions 110, 120, 130, 140, 150, and 160 can be directly disposed on the corresponding multiple antennas 11, 12, 13, 14, 15, and 16 respectively; or, in this embodiment, the invention can also be implemented by using only the first surface 101 of the dielectric substrate 100, that is, without using the second surface 102 of the dielectric substrate 100, and directly soldering the inner conductor 311 and the outer conductor 312 of the first RF transmission line 31 to the first main feed portion 110 and the first main ground portion 1712 respectively; the inner conductor 321 and the outer conductor 312 of the second RF transmission line 32... The outer conductor 322 is soldered to the first auxiliary feed section 120 and the first auxiliary ground section 1714 respectively; the inner conductor 331 and the outer conductor 332 of the third RF transmission line 33 are soldered to the second main feed section 130 and the second main ground section 1716 respectively; the inner conductor 341 and the outer conductor 342 of the fourth RF transmission line 34 are soldered to the second auxiliary feed section 140 and the second auxiliary ground section 1718 respectively; the inner conductor 351 and the outer conductor 352 of the fifth RF transmission line 35 are soldered to the third main feed section 150 and the third main ground section 1722 respectively; and the inner conductor 361 and the outer conductor 362 of the sixth RF transmission line 36 are soldered to the third auxiliary feed section 160 and the third auxiliary ground section 1732 respectively. In addition, the inner conductor 371 and the outer conductor 372 of the seventh radio frequency transmission line 37 can also be electrically connected to the power supply pin 211 and the grounding portion 200, respectively.

[0158] In summary, the above embodiments integrate multiple antennas onto a single small-sized circuit board, and through the non-connected first ground plane 171, second ground plane 172, and third ground plane 173, each antenna not only maintains good radiation performance but also has good isolation between them. This solves the problem that traditional multi-antenna systems cannot simultaneously meet the requirements of small size, multi-band operation, and high isolation (<-10dB), and truly achieves the efficacy and purpose of the present invention.

[0159] However, the above description is merely an embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.

Claims

1. An antenna device, comprising: A circuit board comprising: A dielectric substrate having a first surface; A first main antenna and a first auxiliary antenna, which operate in a first frequency range, are respectively disposed on the first surface of the dielectric substrate and are isolated from each other. A second main antenna and a second auxiliary antenna, which operate in the second frequency range, are respectively disposed on the first surface of the dielectric substrate and are isolated from each other. A third main antenna and a third auxiliary antenna, operating in a third frequency range, are respectively disposed on the first surface of the dielectric substrate and are isolated from each other; and A grounding unit includes a first ground plane, a second ground plane, and a third ground plane disposed on the first surface of the dielectric substrate and isolated from each other. The first ground plane is located between the first main antenna and the first auxiliary antenna, separating the first main antenna and the first auxiliary antenna, and works together with the first main antenna and the first auxiliary antenna. The first ground plane is located between the second main antenna and the second auxiliary antenna, separating the second main antenna and the second auxiliary antenna, and works together with the second main antenna and the second auxiliary antenna. The second ground plane is adjacent to the third main antenna and works together with the third main antenna. The third ground plane is adjacent to the third auxiliary antenna and works together with the third auxiliary antenna. The first ground plane includes a first main grounding portion, a first auxiliary grounding portion, a second main grounding portion, and a second auxiliary grounding portion. The first main antenna has a first main feed portion adjacent to and surrounded by the first ground plane and spaced apart from it. The first auxiliary antenna has a first auxiliary feed portion adjacent to and surrounded by the first ground plane and spaced apart from it. The second main antenna has a second auxiliary feed portion adjacent to and surrounded by the first ground plane and spaced apart from it. The second auxiliary antenna has a second auxiliary feed portion adjacent to the second auxiliary ground portion and surrounded by and spaced apart from the first ground surface; the second ground surface is provided with a third main ground portion, and the third main antenna has a third main feed portion adjacent to the third main ground portion and surrounded by and spaced apart from the second ground surface; the third ground surface is provided with a third auxiliary ground portion, and the third auxiliary antenna has a third auxiliary feed portion adjacent to the third auxiliary ground portion and surrounded by and spaced apart from the third ground surface.

2. The antenna device of claim 1, wherein the dielectric substrate has a first side and a second side that define the edge of the dielectric substrate and are opposite to each other, and a third side and a fourth side that are connected to and opposite to the first side and the second side, the first main antenna is located at the corner formed by the first side and the third side, the first auxiliary antenna is located at the corner formed by the first side and the fourth side, the second main antenna is close to the first side and located between the first main antenna and the first auxiliary antenna, the second auxiliary antenna is close to the fourth side and located between the first auxiliary antenna and the third auxiliary antenna, the third main antenna is located at the corner formed by the second side and the third side, and the third auxiliary antenna is located at the corner formed by the second side and the fourth side.

3. The antenna device of claim 1, wherein the first main antenna includes a first main monopole antenna connected to the first main feed portion, and a first main parasitic antenna extending outward from the first ground plane and spaced apart from and adjacent to the first main monopole antenna and electrically coupled to each other; the first auxiliary antenna includes a first auxiliary monopole antenna connected to the first auxiliary feed portion and a first auxiliary parasitic antenna extending outward from the first ground plane and spaced apart from and adjacent to the first auxiliary monopole antenna and electrically coupled to each other; the second main antenna includes a second main monopole antenna connected to the second main feed portion; the second auxiliary antenna includes a second auxiliary monopole antenna connected to the second auxiliary feed portion; the third main antenna includes a third main monopole antenna connected to the third main feed portion; and the third auxiliary antenna includes a third auxiliary monopole antenna connected to the third auxiliary feed portion.

4. The antenna device of claim 3, wherein the first main monopole antenna further includes a first microstrip line, the first microstrip line extending outward from the first main monopole antenna and passing through the first ground plane at intervals and connecting to the first main feed section; the first auxiliary monopole antenna further includes a second microstrip line, the second microstrip line extending outward from the first auxiliary monopole antenna and passing through the first ground plane at intervals and connecting to the first auxiliary feed section; the second main monopole antenna further includes a third microstrip line, the third microstrip line extending outward from the second main monopole antenna and passing through the first ground plane at intervals and connecting to the first auxiliary feed section. The second main feed is connected to the second auxiliary monopole antenna; the second auxiliary monopole antenna also includes a fourth microstrip line, which extends outward from the second auxiliary monopole antenna and passes through the first ground plane at intervals and connects to the second auxiliary feed; the third main monopole antenna also includes a fifth microstrip line, which extends outward from the third main monopole antenna and passes through the second ground plane at intervals and connects to the third main feed; the third auxiliary monopole antenna also includes a sixth microstrip line, which extends outward from the third auxiliary monopole antenna and passes through the third ground plane at intervals and connects to the third auxiliary feed.

5. The antenna device of claim 4, wherein the dielectric substrate further has a second surface opposite to the first surface, and the grounding unit further includes a first extended ground surface, a second extended ground surface, and a third extended ground surface disposed on the second surface of the dielectric substrate, wherein the first extended ground surface corresponds to the first ground surface and a plurality of through holes electrically connecting the two are formed therebetween; the second extended ground surface corresponds to the second ground surface and a plurality of through holes electrically connecting the two are formed therebetween; and the third extended ground surface corresponds to the third ground surface and a plurality of through holes electrically connecting the two are formed therebetween.

6. The antenna device as claimed in claim 5, wherein, A plurality of through holes electrically connecting the first ground plane and the first extended ground plane are formed between the first ground plane and the first extended ground plane, surrounding the first main feed portion and extending along both sides of the first microstrip line; a plurality of through holes electrically connecting the first ground plane and the first extended ground plane are formed around the first auxiliary feed portion and extending along both sides of the second microstrip line; a plurality of through holes electrically connecting the first ground plane and the first extended ground plane are formed around the second main feed portion and extending along both sides of the third microstrip line; and a plurality of through holes electrically connecting the first ground plane and the first extended ground plane are formed around the second auxiliary feed portion and extending along both sides of the fourth microstrip line. A plurality of through holes are formed between the second ground plane and the second extended ground plane, which are electrically connected to the second ground plane and the second extended ground plane, surrounding the third main feed portion and extending along both sides of the fifth microstrip line; a plurality of through holes are formed between the third ground plane and the third extended ground plane, which are electrically connected to the third ground plane and the third extended ground plane, surrounding the third auxiliary feed portion and extending along both sides of the sixth microstrip line.

7. The antenna device of claim 5, wherein the first extended ground plane is provided with a first main ground pad, a first auxiliary ground pad, a second main ground pad, and a second auxiliary ground pad, and the second surface is provided with a first main feed pad adjacent to the first main ground pad and surrounded by the first extended ground plane and spaced apart from the first extended ground plane; the second surface is provided with a first auxiliary feed pad adjacent to the first auxiliary ground pad and surrounded by the first extended ground plane and spaced apart from the first extended ground plane; the second surface is provided with a first main feed pad adjacent to the second main ground pad and surrounded by the first extended ground plane and spaced apart from the first extended ground plane. A second primary grounding pad is spaced apart. On the second surface, a second secondary grounding pad is provided adjacent to and surrounded by the first extended ground plane, and spaced apart from the first extended ground plane. A third primary grounding pad is provided within the second extended ground plane, and on the second surface, a third primary grounding pad is provided adjacent to and surrounded by the second extended ground plane, and spaced apart from the second extended ground plane. A third secondary grounding pad is provided within the third extended ground plane, and on the second surface, a third secondary grounding pad is provided adjacent to and surrounded by the third extended ground plane, and spaced apart from the third extended ground plane. Wherein, The first main feed pad corresponds to the first main feed portion and a plurality of through holes are formed between them for electrical connection; the first main ground pad corresponds to the first main ground portion and a plurality of through holes are formed between them for electrical connection; the first auxiliary feed pad corresponds to the first auxiliary feed portion and a plurality of through holes are formed between them for electrical connection; the first auxiliary ground pad corresponds to the first auxiliary ground portion and a plurality of through holes are formed between them for electrical connection; the second main feed pad corresponds to the second main feed portion and a plurality of through holes are formed between them for electrical connection; the second main ground pad corresponds to the second main ground portion and a plurality of through holes are formed between them for electrical connection. The second auxiliary feed pad corresponds to the second auxiliary feed portion and a plurality of through holes are formed between them for electrical connection. The second auxiliary grounding pad corresponds to the second auxiliary ground portion and a plurality of through holes are formed between them for electrical connection. The third main feed pad corresponds to the third main feed portion and a plurality of through holes are formed between them for electrical connection. The third main grounding pad corresponds to the third main ground portion and a plurality of through holes are formed between them for electrical connection. The third auxiliary feed pad corresponds to the third auxiliary feed portion and a plurality of through holes are formed between them for electrical connection. The third auxiliary grounding pad corresponds to the third auxiliary ground portion and a plurality of through holes are formed between them for electrical connection.

8. The antenna device of claim 7, wherein the first main feed pad is used to solder to an inner conductor of a first radio frequency transmission line, and the first main ground pad is used to solder to an outer conductor of the first radio frequency transmission line that is insulated from the inner conductor; the first auxiliary feed pad is used to solder to an inner conductor of a second radio frequency transmission line, and the first auxiliary ground pad is used to solder to an outer conductor of the second radio frequency transmission line that is insulated from the inner conductor; the second main feed pad is used to solder to an inner conductor of a third radio frequency transmission line, and the second main ground pad is used to solder to an outer conductor of the third radio frequency transmission line that is insulated from the inner conductor. The second auxiliary feed pad is used to solder to an inner conductor of a fourth RF transmission line, and the second auxiliary ground pad is used to solder to an outer conductor of the fourth RF transmission line that is insulated from the inner conductor; the third main feed pad is used to solder to an inner conductor of a fifth RF transmission line, and the third main ground pad is used to solder to an outer conductor of the fifth RF transmission line that is insulated from the inner conductor; the third auxiliary feed pad is used to solder to an inner conductor of a sixth RF transmission line, and the third auxiliary ground pad is used to solder to an outer conductor of the sixth RF transmission line that is insulated from the inner conductor.

9. The antenna device of claim 8 further includes a housing for receiving the circuit board and at least one elastic plug filled in at least one opening of the housing, wherein the first to sixth radio frequency transmission lines pass through the at least one opening into the housing, and the at least one elastic plug is provided for the first to sixth radio frequency transmission lines to pass through, so as to fix the first to sixth radio frequency transmission lines to the housing.

10. The antenna device of claim 5, wherein the first main antenna, the first auxiliary antenna, the second main antenna, the second auxiliary antenna, the third main antenna, the third auxiliary antenna, the grounding unit, and the first to the sixth microstrip lines are formed from copper foil printed on the first and second surfaces of the dielectric substrate, respectively.

11. The antenna device as claimed in claim 1, wherein the first main antenna is an LTE / 5G broadband main antenna, the first auxiliary antenna is an LTE / 5G broadband auxiliary antenna, the second main antenna is a WiFi broadband main antenna, the second auxiliary antenna is a WiFi broadband secondary antenna, the third main antenna is a 5G broadband main antenna, and the third auxiliary antenna is a 5G broadband secondary antenna.

12. The antenna device of claim 1, wherein the first main feed and the first main ground are respectively soldered to an inner conductor and an outer conductor of a first radio frequency transmission line; the first auxiliary feed and the first auxiliary ground are respectively soldered to an inner conductor and an outer conductor of a second radio frequency transmission line; the second main feed and the second main ground are respectively soldered to an inner conductor and an outer conductor of a third radio frequency transmission line; the second auxiliary feed and the second auxiliary ground are respectively soldered to an inner conductor and an outer conductor of a fourth radio frequency transmission line; the third main feed and the third main ground are respectively soldered to an inner conductor and an outer conductor of a fifth radio frequency transmission line; and the third auxiliary feed and the third auxiliary ground are respectively soldered to an inner conductor and an outer conductor of a sixth radio frequency transmission line.

13. An antenna device, comprising: A circuit board comprising: A dielectric substrate having a first surface; A first main antenna and a first auxiliary antenna, which operate in a first frequency range, are respectively disposed on the first surface of the dielectric substrate and are isolated from each other. A second main antenna and a second auxiliary antenna, which operate in the second frequency range, are respectively disposed on the first surface of the dielectric substrate and are isolated from each other. A third main antenna and a third auxiliary antenna, operating in the third frequency range, are respectively disposed on the first surface of the dielectric substrate and are isolated from each other. A grounding unit includes a first ground plane, a second ground plane, and a third ground plane disposed on the first surface of the dielectric substrate and isolated from each other. The first ground plane is located between the first main antenna and the first auxiliary antenna, separating them and interacting with them. The first ground plane is also located between the second main antenna and the second auxiliary antenna, separating them and interacting with them. The second ground plane is adjacent to the third main antenna and interacts with it. The third ground plane is adjacent to the third auxiliary antenna and interacts with it. A global satellite navigation system antenna, comprising a sub-circuit board separate from the circuit board and a ceramic dielectric antenna operating in a fourth frequency range, the ceramic dielectric antenna being disposed on one side of the sub-circuit board.

14. The antenna device of claim 13, wherein the global satellite navigation system antenna further includes a low-noise amplifier circuit disposed on another side of the sub-circuit board, the ceramic dielectric antenna being electrically connected to the low-noise amplifier circuit via a feed pin passing through the sub-circuit board; and a feed terminal of the low-noise amplifier circuit being electrically connected to an inner conductor of a seventh radio frequency transmission line, and an outer conductor of the seventh radio frequency transmission line insulated from the inner conductor being electrically connected to a grounding pad formed on the other side, and the grounding pad being conductive to a grounding portion disposed on the surface of the sub-circuit board.

15. The antenna device of claim 13, wherein the ceramic dielectric antenna has a feed pin, the sub-circuit board has a grounding portion on the same side, and the feed pin and the grounding portion are respectively electrically connected to an inner conductor and an outer conductor of a seventh radio frequency transmission line.

16. An antenna device, comprising: A circuit board comprising: A dielectric substrate having a first surface; A first main antenna and a first auxiliary antenna, which operate in a first frequency range, are respectively disposed on the first surface of the dielectric substrate and are isolated from each other. A second main antenna and a second auxiliary antenna, which operate in the second frequency range, are respectively disposed on the first surface of the dielectric substrate and are isolated from each other. A third main antenna and a third auxiliary antenna, operating in the third frequency range, are respectively disposed on the first surface of the dielectric substrate and are isolated from each other. A grounding unit includes a first ground plane, a second ground plane, and a third ground plane disposed on the first surface of the dielectric substrate and isolated from each other. The first ground plane is located between the first main antenna and the first auxiliary antenna, separating them and interacting with them. The first ground plane is also located between the second main antenna and the second auxiliary antenna, separating them and interacting with them. The second ground plane is adjacent to the third main antenna and interacts with it. The third ground plane is adjacent to the third auxiliary antenna and interacts with it. A global satellite navigation system antenna, the global satellite navigation system antenna including a ceramic dielectric antenna operating in a fourth frequency range, the ceramic dielectric antenna being disposed on the first surface of the dielectric substrate.

17. The antenna device of claim 16, wherein the dielectric substrate further has a second surface opposite to the first surface, the global navigation satellite system antenna further includes a low-noise amplifier circuit disposed on the second surface of the dielectric substrate, the ceramic dielectric antenna is electrically connected to the low-noise amplifier circuit through a feed pin passing through the dielectric substrate; and a feed terminal of the low-noise amplifier circuit is electrically connected to an inner conductor of a seventh radio frequency transmission line, and an outer conductor of the seventh radio frequency transmission line insulated from the inner conductor is electrically connected to a grounding pad formed on the second surface, and the grounding pad is conductive to a grounding portion disposed on the first surface.

18. The antenna device of claim 16, wherein the ceramic dielectric antenna has a feed pin, the first surface of the dielectric substrate has a grounding portion, and the feed pin and the grounding portion are respectively electrically connected to an inner conductor and an outer conductor of a seventh radio frequency transmission line.

19. The antenna device as claimed in claim 13 or 16, wherein the first frequency range includes 600-960MHz, 1400-1550MHz, 1710-2690MHz, 3300-4200MHz, and 4400-5000MHz; the second frequency range includes 2400-2485MHz, 5150-5850MHz, and 5925-7125MHz; the third frequency range includes 1400-1550MHz, 1710-2690MHz, 3300-4200MHz, and 4400-5000MHz; and the fourth frequency range includes 1555-1610MHz.

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