Antenna structure and wireless communication device using the same

Patent metadata

Field	Value
Publication number	US-9780862-B2
Application number	US-201514642091-A
Country	US
Kind code	B2
Filing date	Mar 9, 2015
Priority date	Oct 21, 2014
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

An antenna structure includes a feed end, a ground end, a main radiator, a coupling portion, a matching circuit, a switching circuit, and a diplexer. The main radiator is coupled to the feed end. The coupling portion is coupled to the ground end and is spaced apart from the main radiator to allow current to flow from the main radiator to the coupling portion. The switching circuit is coupled to the ground end. The diplexer includes a first port, a second port, and a third port, the first port is coupled to the feed end, the second port is coupled to a transceiver via the matching circuit, and the third port is coupled to the transceiver. The diplexer separates high frequency current from low frequency current output from the feed end, the matching circuit and the switching circuit adjust the high frequency current and the low frequency current.

First claim

What is claimed is:

1. An antenna structure comprising:
a feed end;
a ground end;
a main radiator coupled to the feed end;
a coupling portion coupled to the ground end and spaced apart from the main radiator to allow current to flow from the main radiator to the coupling portion;
a matching circuit;
a switching circuit electronically coupled to the ground end; and
a diplexer comprising a first port electronically coupled to the feed end, a second port electronically coupled to a transceiver via the matching circuit, and a third port electronically coupled to the transceiver, the diplexer configured to separate high frequency current from low frequency current output from the feed end,
wherein the matching circuit and the switching circuit tune the high frequency current and the low frequency current;
wherein the main radiator comprises a first radiation sheet, a second radiation sheet, and a third radiation sheet, the second radiation sheet extends from an end of the first radiation sheet and is coplanar with the first radiation sheet, the third radiation sheet comprises a first connection section and a second connection section, the first connection section is connected to an edge of the first radiation sheet and extends towards the coupling portion, the second connection section is connected to a distal end of the first connection section and extends parallel to the coupling portion, the first radiation sheet is coplanar with the first radiation sheet, the second connection section is positioned at a plane perpendicular to a plane in which the first radiation sheet is positioned, and the coupling portion is positioned at a plane parallel to a plane in which the second radiation sheet is positioned.

2. The antenna structure as claimed in claim 1 , wherein a gap is defined between the second connection section and the coupling portion.

3. The antenna structure as claimed in claim 1 , wherein the matching circuit comprises a first switch and a first load component, the first switch is a single pole single throw (SPST) switch, a first terminal of the first switch is electronically coupled to the transceiver, a second terminal of the first switch is switchably coupled to the first load component, and the first load component is grounded.

4. The antenna structure as claimed in claim 3 , wherein the matching circuit further comprises a second switch, a second load component, a third load component, and a fourth load component, the second switch is a single pole double throw (SPDT) switch, a first terminal of the second switch is electronically coupled to the transceiver, and a second terminal of the second switch is switchably coupled to the second load component and the third load component, the second load component and the third load component are electronically coupled between the second switch and the fourth load component in parallel, and the fourth load component is electronically coupled to the second port of the diplexer.

5. The antenna structure as claimed in claim 4 , wherein the matching circuit further comprises a third switch, a fifth load component, and a sixth load component, the third switch is a single pole double throw (SPDT) switch, a first terminal of the third switch is electronically coupled to the second port of the diplexer, and a second terminal of the third switch is switchably coupled to the fifth load component and the sixth load component, and both the fifth load component and the sixth load component are grounded.

6. The antenna structure as claimed in claim 1 , wherein the switching circuit comprises a fourth switch, a seventh load component, and an eighth load component, the fourth switch is a single pole double throw (SPDT) switch, a first terminal of the fourth switch is electronically coupled to the ground end, and a second terminal of the fourth switch is switchably coupled to the seventh load component and the eighth load component, and both the seventh load component and the eighth load component are grounded.

7. A wireless communication device comprising:
a housing defining a slit configured to divide the housing into a main portion and a coupling portion spaced from the main portion;
a transceiver; and
an antenna structure comprising
a feed end;
a ground end coupled to the coupling portion;
a main radiator coupled to the feed end and spaced apart from the main portion to allow current to flow from the main radiator to the coupling portion;
a matching circuit; and
a diplexer comprising a first port electronically coupled to the feed end, a second port electronically coupled to the transceiver via the matching circuit, and a third port directly and electronically coupled to the transceiver, the diplexer configured to separate high frequency current from low frequency current output from the feed end, and configured to output the high frequency current to the transceiver and output the low frequency current to the transceiver via the matching circuit, the matching circuit configured to adjust the low frequency current;
wherein the main radiator comprises a first radiation sheet, a second radiation sheet, and a third radiation sheet, the second radiation sheet extends from an end of the first radiation sheet and is coplanar with the first radiation sheet, the third radiation sheet comprises a first connection section and a second connection section, the first connection section is connected to an edge of the first radiation sheet and extends towards the coupling portion, the second connection section is connected to a distal end of the first connection section and extends parallel to the coupling portion, the first radiation sheet is coplanar with the first radiation sheet, the second connection section is positioned at a plane perpendicular to a plane in which the first radiation sheet is positioned, and the coupling portion is positioned at a plane parallel to a plane in which the second radiation sheet is positioned.

8. The wireless communication device as claimed in claim 7 , wherein a gap is defined between the second connection section and the coupling portion.

9. The wireless communication device as claimed in claim 7 , wherein the matching circuit comprises a first switch and a first load component, the first switch is a single pole single throw (SPST) switch, a first terminal of the first switch is electronically coupled to the transceiver, a second terminal of the first switch is switchably coupled to the first load component, and the first load component is grounded.

10. The wireless communication device as claimed in claim 9 , wherein the matching circuit further comprises a second switch, a second load component, a third load component, and a fourth load component, the second switch is a single pole double throw (SPDT) switch, a first terminal of the second switch is electronically coupled to the transceiver, and a second terminal of the second switch is switchably coupled to the second load component and the third load component, the second load component and the third load component are electronically coupled between the second switch and the fourth load component in parallel, and the fourth load component is electronically coupled to the second port of the diplexer.

11. The wireless communication device as claimed in claim 10 , wherein the matching circuit further comprises a third switch, a fifth load component, and a sixth load component, the third switch is a single pole double throw (SPDT) switch, a first terminal of the third switch is electronically coupled to the second port of the diplexer, and a second terminal of the third switch is switchably coupled to the fifth load component and the sixth load component, and both the fifth load co

Assignees

• Chiun Mai Communication Systems Inc

Inventors

• Liou Geng-Hong
• Lin Yen-Hui

Classifications

• H01Q5/335

  at the feed, e.g. for impedance matching · CPC title

• H01Q9/42

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

• H01Q5/328

  between a radiating element and ground · CPC title

• H01Q1/243 Primary

  with built-in antennas · CPC title

• H04B7/10 Primary

  Polarisation diversity; Directional diversity · CPC title