Antenna device and terminal for reducing antenna correlation of mimo system

Patent metadata

Field	Value
Publication number	US-2018241120-A1
Application number	US-201515752902-A
Country	US
Kind code	A1
Filing date	Sep 28, 2015
Priority date	Aug 25, 2015
Publication date	Aug 23, 2018
Grant date	—

Abstract

Disclosed are an antenna device and a terminal for reducing antenna correlation of an MIMO system. The antenna device includes a support plate inside a terminal; a primary PCB and a secondary PCB supported by the support plate; a reed of a master antenna disposed on the secondary PCB; a first reed and a second reed of a slave antenna disposed on the primary PCB, respectively; and an RF coaxial cable configured to connect the primary PCB and the secondary PCB. The antenna device further comprises at least one slit formed within a non-PCB area of the support plate. A position and a length of the slit depend on a wavelength of a frequency point of an antenna to be improved and an alignment position and a feed position of the antenna in the entire terminal.

First claim

1 . An antenna device for reducing antenna correlation of an MIMO system, comprising:
a support plate; a primary PCB and a secondary PCB supported by the support plate; a reed of a master antenna disposed on the secondary PCB; a first reed and a second reed of a slave antenna disposed on the primary PCB, respectively; and an RF coaxial cable configured to connect the primary PCB and the secondary PCB, the antenna device further comprises at least one slit formed within a non-PCB area of the support plate, and a position and a length of the slit depend on a wavelength of a frequency point of an antenna to be improved and an alignment position and a feed position of the antenna in an entire terminal.

2 . The antenna device according to claim 1 , further comprising: a slave antenna area on the primary PCB using the first reed as a feed point; and a master antenna area on the secondary PCB using the second reed as a feed point, two slits, as a first slit and a second slit, are formed within the non-PCB area of the support plate, the first slit being located on an upper side of the second slit,
a left side of the first slit is arranged to exceed the support plate such that the support plate is divided into upper and lower portions, while a right side of the first slit is arranged not to exceed the support plate, and a right side of the second slit is arranged to exceed the support plate, while a left side of the second slit is arranged not to exceed the support plate.

3 . The antenna device according to claim 2 , wherein a length of the first slit and/or the second slit and a position on the support plate are arranged to depend on a quarter wavelength of a center frequency point of a frequency band to be improved, and a maximum length of the first slit and/or the second slit is not allowed to exceed both edges of the support plate.

4 . The antenna device according to claim 2 , wherein a width of the support plate between the first slit and/or the second slit and joints on both edges of the support plate is arranged not to affect efficiency of the entire antenna.

5 . The antenna device according to claim 1 , wherein two slits, as a third slit and a fourth slit, are formed within the non-PCB area of the support plate, the third slit being located on an upper side of the fourth slit,
a first predetermined distance is provided between the third slit and each of edges of the support plate, and a left side of the fourth slit is in contact with one edge of the support plate while a second predetermined distance is provided between a right side of the fourth slit and the other edge of the support plate.

6 . A terminal comprising an antenna device, wherein the antenna device comprises:
a support plate; a primary PCB and a secondary PCB supported by the support plate; a reed of a master antenna disposed on the secondary PCB; a first reed and a second reed of a slave antenna disposed on the primary PCB, respectively; and an RF coaxial cable configured to connect the primary PCB and the secondary PCB, the antenna device further comprises at least one slit formed within a non-PCB area of the support plate, and a position and a length of the slit depend on a wavelength of a frequency point of an antenna to be improved and an alignment position and a feed position of the antenna in the entire terminal.

7 . The terminal according to claim 6 , wherein the antenna device further comprises: a slave antenna area on the primary PCB using the first reed as a feed point; and a master antenna area on the secondary PCB using the second reed as a feed point,
two slits, as a first slit and a second slit, are formed within the non-PCB area of the support plate, the first slit being located on an upper side of the second slit, a left side of the first slit is arranged to exceed the support plate such that the support plate is divided into upper and lower portions, while a right side of the first slit is arranged not to exceed the support plate, and a right side of the second slit is arranged to exceed the support plate, while a left side of the second slit is arranged not to exceed the support plate.

8 . The terminal according to claim 7 , wherein a length of the first slit and/or the second slit and a position on the support plate are arranged to depend on a quarter wavelength of a center frequency point of a frequency band to be improved, and a maximum length of the first slit and/or the second slit is not allowed to exceed both edges of the support plate.

9 . The terminal according to claim 7 , wherein a width of the support plate between the first slit and/or the second slit and joints on both edges of the support plate is arranged not to affect efficiency of the entire antenna.

10 . The terminal according to claim 6 , wherein two slits, as a third slit and a fourth slit, are formed within the non-PCB area of the support plate, the third slit being located on an upper side of the fourth slit,
a first predetermined distance is provided between the third slit and each of edges of the support plate, and a left side of the fourth slit is in contact with one edge of the support plate while a second predetermined distance is provided between a right side of the fourth slit and the other edge of the support plate.

Assignees

• Zte Corp

Inventors

• Li Qun

Classifications

• H01Q1/1207

  for fastening a rigid aerial element · CPC title

• H01Q1/243

  with built-in antennas · CPC title

• H01Q1/52

  Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure (absorbing means H01Q17/00) · CPC title

• H01Q21/28

  Combinations of substantially independent non-interacting antenna units or systems {(multiple beam H01Q25/00)} · CPC title

• H01Q1/521 Primary

  reducing the coupling between adjacent antennas · CPC title