TWI489692B - MIMO dipole antenna - Google Patents

Description

MIMO dipole antenna

The present invention relates to an antenna, and more particularly to an MIMO dipole antenna.

In recent years, thanks to the development of technology, the rapid development of the communication industry has made the market more and more fierce. Among them, wireless communication is fierce, not only the quality requirements of communication products are getting higher and higher, the demand of consumers It is also increasing. In addition to the performance and performance specifications of the communication products, the light and beautiful appearance and dazzling shape of the products have become one of the competitive conditions in the market, and it is also the only way for manufacturers to open up niches to improve their competitiveness.

However, any advanced wireless communication technology, including mobile phone systems and mobile stations (GSM, CDMA, PHS, etc.) mobile phones and base stations, Wireless Local Area Network (WLAN) devices, Bluetooth devices, global satellite positioning Antennas are required for systems such as Global Positioning System (GPS) and WiMAX (Worldwide Interoperability for Microwave Access). Among them, WiMAX technology provides better wireless data communication services, is an emerging wireless broadband technology, with long-distance, large transmission capacity, can access the Internet anytime, anywhere, let communication, information grasp, and WiMAX long-distance wireless mobile transmission Capabilities, just in conjunction with wired or wireless LANs, as the primary networking technology between different regional networks.

In order to meet WiMAX technology, a "broken dipole antenna" has been proposed. Please refer to Taiwan Patent No. I348788, which solves the problem of antennas for WiMAX technology. The problem of oversized size, however, this antenna configuration is less able to cover the entire WiMAX required frequency band.

Please refer to Taiwan Patent No. I338414, "Broadband Printed Dipole Antenna for Wireless Applications". Although such an antenna can cover the frequency bands required for WiMAX, there is still a need for improvement in terms of gain.

Next, refer to Taiwan Patent No. I326942, "Ultra Wideband Short-Circuit Dipole Antenna". Although this antenna can cover the ultra-wideband portion of WiMAX, it still needs to be strengthened in terms of reflection loss and gain.

In order to solve the deficiencies of the prior art, the inventors propose a MIMO dipole antenna, comprising: a pedestal: the top surface of the pedestal radiates to the peripheral three antenna 埠, the antenna 埠 includes a first radiating metal surface And a second radiating metal surface, the first radiating metal surface includes two opposite first sides and a second side, the second radiating metal surface includes two opposite third sides and a fourth side, a metal The two ends of the segment are respectively connected to the first side edge and the third side edge, and the metal segment is provided with a feeding point; the first radiation metal surface is provided with a first U-shaped missing portion and a second U-shaped missing portion The first U-shaped missing portion is adjacent to the first side edge, the second U-shaped missing portion is adjacent to the second side edge, and the opening of the first U-shaped missing portion faces the opening of the second U-shaped missing portion; The second radiant metal surface is provided with a third U-shaped missing portion and a fourth U-shaped missing portion, the third U-shaped missing portion is adjacent to the third side, and the fourth U-shaped missing portion is adjacent to the fourth side And the opening of the third U-shaped missing portion faces the opening of the fourth U-shaped missing portion.

A reflective metal frame: The reflective metal frame is disposed on the bottom surface of the base, and the reflective metal frame includes three straight sides, and each of the straight sides is adjacent to each of the antennas.

According to the above configuration, the MIMO dipole antenna of the present invention has a better gain in each frequency band, and the resonant path of the antenna 延长 is extended by providing two openings facing each other with U-shaped missing portions. And exciting the multi-frequency end, so that the MIMO dipole antenna can cover the entire WIMAX frequency band, and achieve the purpose of multiple output and multiple input by using three antennas to improve the transmission rate of the MIMO dipole antenna. Moreover, the radiant metal frame can reflect the signal to each antenna 埠, and enhance the directional radiation field type and improve the gain of each frequency band, especially at high frequency directivity and high frequency gain, and have better effects.

(A) ‧ ‧ MIMO dipole antenna

(1) ‧ ‧ pedestal

(2) ‧‧‧Antenna

(21)‧‧‧First radiation metal surface

(211) ‧‧‧ first side

(212) ‧‧‧Second side

(213)‧‧‧First U-shaped missing parts

(214)‧‧‧Second U-shaped missing parts

(215) ‧ ‧ fifth side

(216) ‧‧‧ Sixth side

(22) ‧‧‧second radiating metal surface

(221) ‧‧‧ third side

(222) ‧‧‧ fourth side

(223)‧‧‧ Third U-shaped missing parts

(224)‧‧‧Fourth U-shaped missing parts

(225) ‧‧‧ seventh side

(226)‧‧‧8th side

(3) ‧‧‧Metal segments

(4) ‧‧‧Feeding points

(5) ‧‧‧reflective metal frame

(51)‧‧‧ Straight edge

(6)‧‧‧Reflective metal plates

(7)‧‧‧Connecting parts

The first picture is the appearance of the MIMO dipole antenna

The second picture is a partial enlarged view of the MIMO dipole antenna

The third picture is a cross-sectional view of the MIMO dipole antenna

The fourth figure is a schematic diagram of the result of measuring the reflection coefficient (S-parameter) of the MIMO dipole antenna.

The fifth picture is a schematic diagram of the results of measuring the radiation pattern of the MIMO dipole antenna.

The construction, features, and embodiments of the present invention will be described in detail by reference to the preferred embodiments of the invention.

Referring to the first figure and the second and third figures, the present invention relates to a MIMO dipole antenna, the MIMO dipole antenna (A) comprising: a base (1), the base (1) ) preferably FR4 fiberglass board, which can be reduced The fabrication cost of the MIMO (A) dipole antenna is preferably 1.6 (1 ± 5%) mm, and the loss tangent of the pedestal (1) is preferably 0.0245 (1 ± 5%). The area of the pedestal (1) is preferably 60*60* π(1±5%) mm2, wherein the bottom surface of the pedestal (1) is preferably connected to a reflective metal plate by a connecting member (7) ( 6), the radiation field pattern of the MIMO dipole antenna (A) can be made to produce an approximately directivity effect. The top surface of the base (1) radiates toward the peripheral three antennas (2), and the antenna (2) includes a first radiating metal surface (21) and a second radiating metal surface (22). A radiating metal surface (21) includes two opposite first sides (211) and a second side (212), the second radiating metal (22) surface including two opposite third sides (221) and a fourth The side (222), the two ends of a metal segment (3) are respectively connected to the first side (211) and the third side (221), and the metal segment (3) is provided with a feeding point (4) .

The first radiating metal surface (21) is provided with a first U-shaped missing portion (213) and a second U-shaped missing portion (214), and the first U-shaped missing portion (213) is adjacent to the first side (211) The second U-shaped missing portion (214) is adjacent to the second side edge (212), and the opening of the first U-shaped missing portion (213) faces the opening of the second U-shaped missing portion (214).

The second radiating metal surface (22) is provided with a third U-shaped missing portion (223) and a fourth U-shaped missing portion (224), and the third U-shaped missing portion (223) is adjacent to the third side (221) The fourth U-shaped missing portion (224) is adjacent to the fourth side edge (222), and the opening of the third U-shaped missing portion (223) faces the opening of the fourth U-shaped missing portion (224).

The opening width of the second U-shaped missing portion (214) is preferably greater than the opening width of the first U-shaped missing portion (213), and the opening width of the fourth U-shaped missing portion (224) is preferably greater than the opening width. The opening width of the third type missing portion (223). The length of the first U-shaped missing portion (213) and the third U-shaped missing portion (223) are preferably 13.6 (1±5%) mm, respectively, the second U-shaped missing portion (214) and the The length of the fourth U-shaped missing portion (224) is preferably 20.8 (1 ± 5%) mm, respectively.

And a reflective metal frame (5) is disposed on the bottom surface of the base (1), the reflective metal frame (5) includes three straight sides (51), and each straight side (51) is adjacent to each antenna 埠 (2), and each The length of the straight edge (51) is preferably 34 (1 ± 5%) mm, and the straight edge (51) is preferably respectively adjacent to the fifth or sixth side of the adjacent first radiating metal surface (21). (215, 216), and the seventh or eighth side edges (225, 226) of the adjacent second radiating metal face (22) are parallel. As can be seen from the above configuration, the MIMO dipole antenna (A) of the present invention is The first radiating metal surface (21) and the second radiating metal surface (22) are both provided with two U-shaped missing portions, so that when the antenna 埠 (2) generates an induced current, the induced current flows through the second a side edge (212), the fifth side edge (215) or the sixth side edge (216), the first side edge (211), and then the metal segment (3) flows to the second radiation metal surface (22) Or the induced current sequentially passes through the fourth side (222), the seventh side (225) or the eighth side (226), the third side (221), and the metal segment (3) Flowing into the first radiating metal surface (21) so that the induced current does not directly pass through the first to fourth U-shaped missing portions (213, 214) 223, 224), to extend the antenna port (2) of the resonant path.

Moreover, the reflective metal plate (6) has the directional field of the MIMO dipole antenna (A), and the radiation metal frame (5) is used to reflect the signal to enhance the directional radiation field. Increasing the gain of each frequency band, especially at high frequency directivity and high frequency gain, has a better effect, and the radiating metal frame (5) is parallel with the fifth side (215) or the first side adjacent to the straight side. The six sides (216), and the seventh side (225) or the eighth side (226) have better results.

The WiMAX (2.5~2.69GHz, 3.3~3.8GHz, 5.25~5.85GHz) operating frequency band, the MIMO dipole antenna (A) has better impedance matching, and the low frequency bandwidth ranges from 2490 to 4240MHz. The high frequency bandwidth ranges from 5130 to 5980 MHz, and the gain of each frequency band is about 7.8, 7.8, and 7.5 dBi.

Please see the fourth figure, the fourth figure measures the S parameter of the MIMO dipole antenna (A). A schematic diagram of the result of (S-parameter), the ordinate indicates the reflection coefficient, and the abscissa indicates the frequency. With a reflection coefficient of less than or equal to -10 dB, we can find that the modality of the MIMO dipole antenna (A) can cover the operating bandwidth of the entire WiMAX.

Referring to the fifth figure, the fifth figure measures the radiation pattern of the MIMO dipole antenna (A). As can be seen from the figure, the MIMO dipole antenna (A) is affected by the reflective metal frame (5) and has better directivity in the -y direction.

In summary, the present invention is indeed in line with industrial utilization, and is not found in publications or publicly used before application, nor is it known to the public, and has non-obvious knowledge, conforms to patentable requirements, and patents are filed according to law. .

However, the above description is a preferred embodiment of the invention in the industry, and all the equivalent changes made according to the scope of the patent application of the present invention belong to the scope of the claim.

(A) ‧ ‧ MIMO dipole antenna

(1) ‧ ‧ pedestal

(2) ‧‧‧Antenna

(21)‧‧‧First radiation metal surface

(211) ‧‧‧ first side

(212) ‧‧‧Second side

(213)‧‧‧First U-shaped missing parts

(214)‧‧‧Second U-shaped missing parts

(215) ‧ ‧ fifth side

(216) ‧‧‧ Sixth side

(22) ‧‧‧second radiating metal surface

(221) ‧‧‧ third side

(222) ‧‧‧ fourth side

(223)‧‧‧ Third U-shaped missing parts

(224)‧‧‧Fourth U-shaped missing parts

(225) ‧‧‧ seventh side

(226)‧‧‧8th side

(3) ‧‧‧Metal segments

(4) ‧‧‧Feeding points

(5) ‧‧‧reflective metal frame

(51)‧‧‧ Straight edge

Claims (7)

A MIMO dipole antenna includes: a top surface of a pedestal radiating to a peripheral three antenna 埠, the antenna 埠 including a first radiating metal surface and a second radiating metal surface, the first radiating metal surface including two opposite The first side and the second side of the second radiating metal surface comprise two opposite third sides and a fourth side, and the two ends of a metal segment are respectively connected to the first side and the third side And the metal segment is provided with a feeding point; the first radiant metal surface is provided with a first U-shaped missing portion and a second U-shaped missing portion, the first U-shaped missing portion is adjacent to the first side, the first The second U-shaped missing portion is adjacent to the second side, and the opening of the first U-shaped missing portion faces the opening of the second U-shaped missing portion; the second radiating metal surface is provided with a third U-shaped missing portion and a first a fourth U-shaped missing portion adjacent to the third side, the fourth U-shaped missing portion is adjacent to the fourth side, and the opening of the third U-shaped missing portion faces the fourth U-shaped portion The opening of the missing part. A reflective metal frame is disposed on the bottom surface of the base, and the reflective metal frame includes three straight sides, and each of the straight sides is adjacent to each of the antennas. The MIMO dipole antenna of claim 1, wherein the length of each straight side is 34 (1 ± 5%) mm. The MIMO dipole antenna according to claim 2, wherein an opening width of the second U-shaped missing portion is greater than an opening width of the first U-shaped missing portion, and an opening width of the fourth U-shaped missing portion is greater than the The opening width of the third type missing portion. The MIMO dipole antenna according to claim 3, wherein the first U-shaped missing portion and the third U-shaped missing portion have a length of 13.6 (1±5%) mm, respectively, and the second U-shaped missing portion Department and The length of the fourth U-shaped missing portion is 20.8 (1 ± 5%) mm, respectively. The MIMO dipole antenna according to claim 1, wherein the pedestal is selected from the group consisting of FR4 fiberglass sheets having a thickness of 1.6 (1±5%) mm and a loss tangent of 0.0245 (1±5%). The area of the seat is 60*60*3.14 (1±5%) mm ² . The MIMO dipole antenna of claim 1, wherein the bottom surface of the base is connected to a reflective metal plate by a connecting member, and the reflective metal plate has a distance from the base. The MIMO dipole antenna of claim 6, wherein the pitch is 18.38 (1 ± 5%) mm.