Antenna assembly and wireless communication device employing same

Patent metadata

Field	Value
Publication number	US-2016164192-A1
Application number	US-201514677748-A
Country	US
Kind code	A1
Filing date	Apr 2, 2015
Priority date	Dec 5, 2014
Publication date	Jun 9, 2016
Grant date	—

Abstract

An antenna assembly includes a first radiating portion, a second radiating portion, a third radiating portion, and a switch circuit. The switch circuit is electrically connected between the second radiating portion and the third radiating portion. The switch circuit includes a plurality of branch circuit with different impedances. The first radiating portion and the second radiating portion are electrically coupled and configured to operate at a first frequency band; the first radiating portion, the third radiating portion, the switch circuit, and the second radiating portion are electrically coupled and configured to operate at a second frequency band; the switch circuit is configured to adjust a resonance mode of the antenna assembly by switching to different impedances. A wireless communication device employing the antenna assembly is also provided.

First claim

What is claimed is:

1 . An antenna assembly comprising:
a feeding point; a first radiating portion electrically connected to the feeding point; a second radiating portion electrically connected to a ground point and spaced apart from the first radiating portion; and a switch circuit electrically connected between the second radiating portion and a third radiating portion which is spaced from the first radiating portion, the switch circuit comprising a plurality of branch circuits each with different impedances; wherein the first radiating portion and the second radiating portion are electrically coupled and configured to operate at a first frequency band; the first radiating portion, the third radiating portion, the switch circuit, and the second radiating portion are electrically coupled and configured to operate at a second frequency band; the switch circuit is configured to adjust a resonance mode of the antenna assembly by switching to different impedances.

2 . The antenna assembly as claimed in claim 1 , wherein the first radiating portion is substantially a T-shaped monopole antenna and includes a first radiating section, a second radiating section, and a third radiating section; an end of the first radiating section is electrically connected to the feeding point, the other end is perpendicularly connected to the second radiating section and the third radiating section, the second radiating section and the third radiating section extend oppositely from the first radiating section.

3 . The antenna assembly as claimed in claim 2 , wherein the second radiating portion comprises a first radiating member and a second radiating member, the first radiating member is substantially L-shaped and comprises a shorter section and a longer section, the shorter section is electrically connected to the ground point, the longer section is perpendicularly connected to the shorter section.

4 . The antenna assembly as claimed in claim 3 , wherein the second radiating member comprises a first connecting section, a second connecting section, and a third connecting section; the first connecting section is substantially perpendicular to an end of the longer section away from the shorter section; the second connecting section is substantially perpendicular to an end of the first connecting section away from the longer section, the second connecting section extends towards the first radiating section and parallel to the third radiating section, and a first slot is formed between the second connecting section and the third radiating section; the third connecting section is substantially L-shaped and perpendicularly connected to the an end of the second connecting section close to the first radiating section, and extends towards the first connecting section and parallel to the second connecting section.

5 . The antenna assembly as claimed in claim 4 , wherein the third radiating portion defines first gap and a second gap and comprises a first antenna frame and a second antenna frame; the first frame is substantially L-shaped and includes a first frame section and a second frame section perpendicularly connected to the first frame section; the first gap is defined on an end of the first frame section, and the second gap is defined on an end of the second frame section; the second frame section, the second radiating section, and the third radiating section enclose a second slot; the second antenna frame is substantially L-shaped, one end of the second antenna frame is spaced from the first antenna frame via the second gap.

6 . The antenna assembly as claimed in claim 5 , wherein the switch circuit comprises a switching element and at least one reactance; the switching element comprises an input terminal and at least one output terminal; the input terminal is electrically connected to an end of the first frame section close to the first gap; one end of the at least one reactance is electrically connected the output terminal, and the other end is electrically connected to an end of the longer section.

7 . The antenna assembly as claimed in claim 3 , wherein the at least one reactance is a capacitor, an inductor, a resistor, or a combination of the capacitor, the inductor, and the resistor in serial or in parallel; the third radiating portion is electrically connected to the second radiating portion via a short circuit, the reactance, or the reactance combinations by switching the switching element.

8 . The antenna assembly as claimed in claim 3 , wherein the second radiating portion comprises a first radiating member and a second radiating member; the second radiating member comprises a first connecting section and a second connecting section; first connecting section is perpendicularly connected to an end of the first radiating member, the second connecting section is perpendicularly connected to an end of the first connecting section away from the first radiating member, and extends towards the first radiating portion and parallel to the third radiating portion; a third slot is formed between the second connecting section and the first radiating portion, and a fourth slot is formed between the second connecting section and the third radiating portion.

9 . The antenna assembly as claimed in claim 3 , wherein the second radiating portion includes a first radiating member, a second radiating member, and a third radiating member; the third radiating member and the first radiating member are symmetrically arranged on two sides of the first radiating portion; the second radiating member is coupled between the first radiating member and the third radiating member; a fifth slot is formed between the second radiating member and the first radiating portion, and a sixth slot is formed between the second radiating member and the third radiating portion.

10 . A wireless communication device comprising:
a base board defining a clearance zoon; a metal frame surrounding the base board; and an antenna assembly comprising: a feeding point arranged on the base board and adjacent to the clearance zoon; a ground point arranged on the base board and adjacent to the clearance zoon; a first radiating portion electrically connected to the feeding point; a second radiating portion electrically connected to the ground point and spaced from the first radiating portion; a third radiating portion being a portion of the metal frame and spaced from the first radiating portion; and a switch circuit electrically connected between the second radiating portion and the third radiating portion, the switch circuit comprising a plurality of branch circuits each with different impedances; wherein the first radiating portion and the second radiating portion are electrically coupled and configured to operate at a first frequency band; the first radiating portion, the third radiating portion, the switch circuit, and the second radiating portion are electrically coupled and configured to operate at a second frequency band; the switch circuit is configured to adjust a resonance mode of the antenna assembly by switching to different impedances.

11 . The wireless communication device as claimed in claim 10 , wherein the feeding point is electrically connected to a radio frequency transceiver circuit of the wireless communication device and configured to feed in signals for the antenna assembly; the ground point is electrically connected to a ground of the base board to provide grounding signals to the antenna assembly.

12 . The wireless communication device as claimed in claim 11 , wherein the metal frame defines a first gap and a second gap to divide the metal frame into a first antenna frame, a second antenna frame, and a

Assignees

• Chiun Mai Comm Systems Inc

Inventors

• Lin Yen-Hui

Classifications

• H01Q5/314

  using frequency dependent circuits or components, e.g. trap circuits or capacitors · CPC title

• H01Q1/243 Primary

  with built-in antennas · CPC title

• H01Q21/30 Primary

  Combinations of separate antenna units operating in different wavebands and connected to a common feeder system · CPC title

• H01Q9/42

  with folded element, the folded parts being spaced apart a small fraction of the operating wavelength · CPC title

• H01Q1/38

  formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface  H01Q15/142)} · CPC title