TWI720884B - Anti-electromagnetic interference antenna - Google Patents

Abstract

The present invention discloses an anti-electromagnetic interference antenna, including a first substrate layer, a ground layer, a first circuit layer, a second substrate layer, a second circuit layer, a third substrate layer, a third circuit layer, a fourth substrate layer, and a fourth substrate layer. Circuit layer. The ground layer is installed on the bottom surface of the first substrate layer and includes a ground loop. The ground loop completely covers the bottom surface of the first substrate layer, and because the ground loop completely covers the bottom surface of the first substrate layer, the antenna radiation circuit can prevent electromagnetic waves from generating interference from the bottom surface of the anti-electromagnetic interference antenna. Accordingly, electromagnetic waves can be largely isolated to prevent noise generated by electromagnetic interference from affecting the antenna installed in the electronic device.

Description

Anti-electromagnetic interference antenna

The present invention relates to an antenna, in particular to an anti-EMI (anti-EMI) antenna.

Electronic devices usually include wireless communication functions. Therefore, electronic devices are equipped with antennas or wireless transmitters to support wireless communication functions.

However, electronic devices further include a plurality of integrated circuits (ICs). When the electronic devices are operated, the integrated circuits may generate electromagnetic waves. The electromagnetic waves generated by the integrated circuit may generate noise, which further interferes with the antenna installed in the electronic device. Therefore, the antenna installed in the electronic device still needs improvement.

In view of the above problems, the object of the present invention is to provide an anti-EMI (anti-EMI) antenna. The anti-electromagnetic interference antenna disclosed in the present invention can avoid electromagnetic interference. The anti-electromagnetic interference antenna includes a first substrate layer, a ground layer, a first circuit layer, a second substrate layer, a second circuit layer, a third substrate layer, a third circuit layer, a fourth substrate layer, and a fourth circuit layer.

The ground layer is installed on the bottom surface of the first substrate layer and includes a ground loop; wherein the ground loop completely covers the bottom surface of the first substrate layer. The first circuit layer includes an antenna signal circuit and a plurality of first ground loops. The first ground loops are installed around the antenna signal circuit. The first circuit layer is installed between the top surface of the first substrate layer and the bottom surface of the second substrate layer.

The second circuit layer includes a first antenna circuit, a second antenna circuit, and a plurality of second ground loops. The second ground loops are installed around the first antenna circuit and the second antenna circuit.

The third substrate layer includes a first antenna through hole, a second antenna through hole, and a plurality of ground through holes. The second circuit layer is installed between the top surface of the second substrate layer and the bottom surface of the third substrate layer. The ground hole is installed around the first antenna hole and the second antenna hole. The first antenna circuit and the second antenna circuit are electrically connected to the antenna signal circuit through the second substrate layer. The second ground loop is electrically connected to the first ground loop through the second substrate layer.

The third circuit layer includes a third antenna circuit, a fourth antenna circuit, and a plurality of third ground loops. The third circuit layer is installed between the top surface of the third substrate layer and the bottom surface of the fourth substrate layer.

Two ends of the first antenna hole are electrically connected to the first antenna circuit and the third antenna circuit, respectively. Both ends of the second antenna hole are electrically connected to the second antenna circuit and the fourth antenna circuit.

The fourth circuit layer is installed on the top surface of the fourth substrate layer and includes an antenna radiation circuit and a plurality of fourth ground loops. The fourth ground loop is installed around the antenna radiation circuit. The antenna radiation circuit is electrically connected to the third antenna circuit and the fourth antenna circuit through the fourth substrate layer. The fourth ground loop is electrically connected to the third ground loop through the fourth substrate layer.

Since the ground loop completely covers the bottom surface of the first substrate layer, the antenna radiation circuit can prevent electromagnetic waves from generating interference from the bottom surface of the anti-electromagnetic interference antenna. Furthermore, since the first ground loop, the second ground loop, the ground through hole, and the fourth ground loop are installed in the antenna signal circuit, the two second antenna circuits, the first antenna through hole, the second antenna through hole, and the antenna radiation circuit, respectively Around, so electromagnetic interference can be avoided.

That is, the ground loop, the first ground loop, the second ground loop, the ground perforation, and the fourth ground loop form an isolation wall. The isolation wall contains a cavity for accommodating the antenna signal circuit, the first antenna circuit, the second antenna circuit, the first antenna perforation, the second antenna perforation, and the antenna radiation circuit. Therefore, electromagnetic waves can be mostly Isolation to avoid the influence of noise caused by electromagnetic interference.

Please refer to FIGS. 1 to 3, which are schematic diagrams of the anti-electromagnetic interference antenna of the present invention. The anti-electromagnetic interference antenna includes a ground layer 10, a first substrate layer 11, a first circuit layer 12, a second substrate layer 21, a second circuit layer 22, a third substrate layer 31, a third circuit layer 32, and a fourth substrate layer 41 And the fourth circuit layer 42.

The ground layer 10 is installed on the bottom surface of the first substrate layer 11 and includes a ground loop 101. The ground loop 101 completely covers the bottom surface of the first substrate layer 11. The first circuit layer 12 is installed between the top surface of the first substrate layer 11 and the bottom surface of the second substrate layer 21. The first circuit layer 12 includes an antenna signal circuit 121 and a plurality of first ground loops 122. The first ground loop 122 is installed around the antenna signal circuit 121.

The second circuit layer 22 is installed between the top surface of the second substrate layer 21 and the bottom surface of the third substrate layer 31. The second circuit layer 22 includes a first antenna circuit 221, a second antenna circuit 222 and a plurality of second ground loops 223. The second ground loop 223 is installed around the first antenna circuit 221 and the second antenna circuit 222.

The third substrate layer 31 includes a first antenna through hole 311, a second antenna through hole 312 and a plurality of ground through holes 313. The ground through hole 313 is installed around the first antenna through hole 311 and the second antenna through hole 312. The first antenna circuit 221 and the second antenna circuit 222 are electrically connected to the antenna signal circuit 121 through the second substrate layer 21. The second ground loop 223 is electrically connected to the first ground loop 122 through the second substrate layer 21.

The third circuit layer 32 is installed between the top surface of the third substrate layer 31 and the bottom surface of the fourth substrate layer 41. The third circuit layer 32 includes a third antenna circuit 321, a fourth antenna circuit 322 and a plurality of third ground loops 323.

Two ends of the first antenna through hole 311 are electrically connected to the first antenna circuit 221 and the third antenna circuit 321 respectively. Two ends of the second antenna through hole 312 are electrically connected to the second antenna circuit 222 and the fourth antenna circuit 322 respectively.

The fourth circuit layer 42 is mounted on the top surface of the fourth substrate layer 41 and includes an antenna radiation circuit 421 and a plurality of fourth ground loops 422. The fourth ground loop 422 is installed around the antenna radiation circuit 421. The antenna radiation circuit 421 is electrically connected to the third antenna circuit 321 and the fourth antenna circuit 322 through the fourth substrate layer 41. The fourth ground loop 422 is electrically connected to the third ground loop 323 through the fourth substrate layer 41.

The ground loop 101, the first ground loop 122, the second ground loop 223, the ground through hole 313, and the fourth ground loop 422 form an isolation wall. The isolation wall includes a cavity to accommodate the antenna signal circuit 121, the first antenna circuit 211, the second antenna circuit 212, the first antenna through hole 311, the second antenna through hole 312, and the antenna radiation circuit 421. When the anti-electromagnetic interference antenna is installed in an electronic device, the electromagnetic waves generated by the integrated circuits (ICs) of the electronic device can be mostly isolated to avoid noise caused by electromagnetic interference.

Furthermore, the anti-electromagnetic interference antenna further includes a fifth substrate layer 51 and a fifth circuit layer 52. The fourth circuit layer 42 is installed between the top surface of the fourth substrate layer 41 and the bottom surface of the fifth substrate layer 51. The fifth circuit layer 52 is mounted on the top surface of the fifth substrate layer 51 and includes a plurality of fifth ground loops 521. The fifth ground loop 521 is electrically connected to the fourth ground loop 422 through the fifth substrate layer 51.

Since the anti-electromagnetic interference antenna further includes the fifth substrate layer 51 and the fifth circuit layer 52, the fifth ground loop 521 can be higher than the antenna radiation circuit 421. Therefore, the side line of the isolation wall can be higher than the antenna radiation circuit 421 to improve the effectiveness of the anti-electromagnetic interference antenna.

In addition, the through hole 60 is formed by penetrating the fifth substrate layer 51 and the fifth circuit layer 52, and the antenna radiation circuit 421 can be exposed through the through hole 60.

The second substrate layer 21 includes two first connection through holes 211 and two second connection through holes 222. The first antenna circuit 221 is electrically connected to the antenna signal circuit 121 through the two first connection through holes 211 of the second substrate layer 21. The second antenna circuit 222 is electrically connected to the antenna signal circuit 121 through the two second connection through holes 212 of the second substrate layer 21.

The fourth substrate layer 41 includes two third connection through holes 411 and two fourth connection through holes 412. The third antenna circuit 321 is electrically connected to the antenna radiation circuit 421 through the two third connection through holes 411 of the fourth substrate layer 41. The fourth antenna circuit 322 is electrically connected to the antenna radiation circuit 421 through the two fourth connection through holes 412 of the fourth substrate layer 41.

Please refer to FIG. 2, the antenna radiation circuit 421 of the fourth circuit layer 42 is a rectangular microstrip antenna, and the rectangular microstrip antenna includes two connecting portions 4211. The two connecting portions 4211 respectively extend outward from the two long sides of the rectangular microstrip antenna.

One of the connection portions 4211 is electrically connected to the third antenna circuit 321 through the two third connection through holes 411 of the fourth substrate layer 41, and the other connection portion 4211 is electrically connected to the fourth antenna circuit 321 through the two fourth connection holes 412 of the fourth substrate layer 41 Antenna circuit 322.

Furthermore, the two connecting portions 4211 respectively extend outward from the middle positions of the two long sides of the rectangular microstrip antenna.

The antenna radiation circuit 421 is a rectangular microstrip antenna with two connecting parts 4211 extending outward from the middle of the two long sides of the rectangular microstrip antenna. Therefore, the anti-electromagnetic interference antenna has an inductance-capacitance balanced feed design (LC- balanced feeding design) to enhance antenna efficiency and bandwidth.

In summary, since the isolation wall contains a cavity, it is convenient to accommodate the antenna signal circuit 121, the first antenna circuit 211, the second antenna circuit 212, the first antenna through hole 311, the second antenna through hole 312, and the antenna The radiation circuit 421, therefore, the anti-electromagnetic interference antenna is a cavity backed antenna, that is, the anti-electromagnetic interference antenna has a cavity backed design to enhance its antenna gain.

In addition, the ground loop 101 includes a plurality of connection holes. The antenna signal circuit 121 is installed near the bottom of the anti-electromagnetic interference antenna, and the antenna signal circuit 121 can be electrically connected to an external printed circuit board (PCB) through the connection hole to facilitate signal transmission. Therefore, the antenna signal circuit 121 can be electrically connected to the printed circuit board and isolated from the ground loop 101, that is, the anti-electromagnetic interference antenna is a bottom-fed design with a reduced size.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed as above in preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the professional technology Personnel, without departing from the scope of the technical solution of the present invention, when the technical content disclosed above can be used to make slight changes or modification into equivalent embodiments with equivalent changes, but any content that does not deviate from the technical solution of the present invention, according to the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the technical solutions of the present invention.

10: Ground plane 101: Ground loop 11: The first substrate layer 12: The first circuit layer 121: Antenna signal circuit 122: first ground loop 21: The second substrate layer 211: The first antenna circuit 212: second antenna circuit 22: The second circuit layer 221: first antenna circuit 222: second antenna circuit 223: second ground loop 31: The third substrate layer 311: First antenna perforation 312: second antenna perforation 313: Ground Piercing 32: third circuit layer 321: third antenna circuit 322: fourth antenna circuit 323: third ground loop 41: The fourth substrate layer 411: third connection perforation 412: fourth connection perforation 42: fourth circuit layer 421: Antenna Radiation Circuit 4211: connecting part 422: The fourth ground loop 51: fifth substrate layer 52: Fifth circuit layer 521: Fifth Ground Loop 60: Through hole

Figure 1 is a schematic diagram of the anti-electromagnetic interference antenna of the present invention; Figure 2 is a top view of the anti-electromagnetic interference antenna of the present invention; and Figure 3 is a cross-sectional view of the anti-electromagnetic interference antenna of the present invention.

223: second ground loop

311: First antenna perforation

312: second antenna perforation

313: Ground Piercing

321: third antenna circuit

322: fourth antenna circuit

323: third ground loop

421: Antenna Radiation Circuit

4211: connecting part

521: Fifth Ground Loop

60: Through hole

Claims (8)

An anti-electromagnetic interference antenna, including: A first substrate layer; A ground layer installed on a bottom surface of the first substrate layer and including a ground loop; wherein the ground loop completely covers the bottom surface of the first substrate layer; A first circuit layer, including an antenna signal circuit and a plurality of first ground loops; wherein the first ground loop is installed around the antenna signal circuit; A second substrate layer; wherein the first circuit layer is mounted between a top surface of the first substrate layer and a bottom surface of the second substrate layer; A second circuit layer, including a first antenna circuit, a second antenna circuit, and a plurality of second ground loops; wherein the second ground loop is installed around the first antenna circuit and the second antenna circuit ； A third substrate layer, including a first antenna through hole, a second antenna through hole, and a plurality of ground through holes; The second circuit layer is installed between a top surface of the second substrate layer and a bottom surface of the third substrate layer; The ground through hole is installed around the first antenna through hole and the second antenna through hole; The first antenna circuit and the second antenna circuit are electrically connected to the antenna signal circuit through the second substrate layer; The second ground loop is electrically connected to the first ground loop through the second substrate layer; A third circuit layer, including a third antenna circuit, a fourth antenna circuit, and a plurality of third ground loops; A fourth substrate layer; wherein the third circuit layer is installed between a top surface of the third substrate layer and a bottom surface of the fourth substrate layer; Two ends of the first antenna perforation are respectively electrically connected to the first antenna circuit and the third antenna circuit; Two ends of the second antenna hole are electrically connected to the second antenna circuit and the fourth antenna circuit; A fourth circuit layer, mounted on a top surface of the fourth substrate layer, and including an antenna radiation circuit and a plurality of fourth ground loops; The fourth ground loop is installed around the antenna radiation circuit; The antenna radiation circuit is electrically connected to the third antenna circuit and the fourth antenna circuit through the fourth substrate layer; The fourth ground loop is electrically connected to the third ground loop through the fourth substrate layer. The anti-electromagnetic interference antenna described in claim 1, further including: A fifth substrate layer; wherein the fourth circuit layer is mounted between the top surface of the fourth substrate layer and a bottom surface of the fifth substrate layer; and A fifth circuit layer, mounted on a top surface of the fifth substrate layer, and including a plurality of fifth ground loops; The fifth ground loop is electrically connected to the fourth ground loop through the fifth substrate layer. The anti-electromagnetic interference antenna according to claim 1, wherein the second substrate layer includes: Two first connection through holes; wherein the first antenna circuit is electrically connected to the antenna signal circuit through the two first connection through holes of the second substrate layer; Two second connection through holes; wherein the second antenna circuit is electrically connected to the antenna signal circuit through the two second connection through holes of the second substrate layer. The anti-electromagnetic interference antenna according to claim 1, wherein the fourth substrate layer includes: Two third connection through holes; wherein the third antenna circuit is electrically connected to the antenna radiation circuit through the two third connection through holes of the fourth substrate layer; and Two fourth connection through holes; wherein the fourth antenna circuit is electrically connected to the antenna radiation circuit through the two fourth connection through holes of the fourth substrate layer. The anti-electromagnetic interference antenna according to claim 2, wherein the fourth substrate layer includes: Two third connection through holes; wherein the third antenna circuit is electrically connected to the antenna radiation circuit through the second and third connection through holes of the fourth substrate layer; Two fourth connection through holes; wherein the fourth antenna circuit is electrically connected to the antenna radiation circuit through the two fourth connection through holes of the fourth substrate layer. The anti-electromagnetic interference antenna according to claim 4, further comprising a through hole; wherein the through hole is formed by penetrating the fifth substrate layer and the fifth circuit layer to expose the antenna radiation circuit. The anti-electromagnetic interference antenna according to claim 6, wherein the antenna radiation circuit of the fourth circuit layer is a rectangular microstrip antenna, and the rectangular microstrip antenna includes two connecting parts; The two connecting parts respectively extend outward from the two long sides of the rectangular microstrip antenna; One of the connection portions is electrically connected to the third antenna circuit through the two third connection through holes of the fourth substrate layer, and the other connection portion is electrically connected through the two fourth connection through holes of the fourth substrate layer The fourth antenna circuit. The anti-electromagnetic interference antenna according to claim 7, wherein the two connecting portions respectively extend outward from the middle position of the two long sides of the rectangular microstrip antenna.

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