Small antenna apparatus and method for controlling the same

• US 9,306,288 B2
• Filed: 12/26/2012
• Issued: 04/05/2016
• Est. Priority Date: 01/13/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Jungsik, Chun, Sooung
• Primary Examiner(s): Vo, Nguyen
• Application Number:
  US13/727,205
• Publication Number:
  US 20130184038A1
• Time in Patent Office: 1,196 Days
• Field of Search: 455/129, 455/193.1, 455/193.2, 455/193.3, 455/121, 455/269
• US Class Current: 1/1
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 9/145 by varying the electrical length
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
• CPC Class Codes: H04B 1/0458 Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages matching circuits in general H03H
• CPC Class Codes: H04B 1/18 Input circuits, e.g. for coupling to an antenna or a transmission line coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

An antenna apparatus for a mobile terminal is provided. The antenna apparatus includes an antenna pattern, a first electric circuit and a second electric circuit respectively connected between both ends of the antenna pattern and a system ground, and a third electric circuit disposed between the antenna pattern and a feeding line, wherein the first electric circuit and the second electric circuit extend electrical wavelengths of the antenna pattern and the third electric circuit increases input impedance matching.

Claims

1. An antenna apparatus, comprising:

an antenna pattern;

a first electric circuit and a second electric circuit respectively connected between both ends of the antenna pattern and a system ground; and

a third electric circuit disposed between the antenna pattern and a feeding line,

wherein the first electric circuit, the second electric circuit, and the third electric circuit extend electrical wavelengths of the antenna pattern.

2. The antenna apparatus of claim 1, wherein the antenna pattern is asymmetrically formed based on the feeding line.

3. The antenna apparatus of claim 1, wherein the first electric circuit, the second electric circuit, and the third electric circuit include at least one of a passive device, an active device, and a combination of the passive device and active device.

4. The antenna apparatus of claim 3, wherein the device has at least one of a chip type structure, a package type structure, and an inter-digital structure.

5. The antenna apparatus of claim 4, wherein the first electric circuit is a capacitor connected between a shorting point and an end of the antenna pattern,

wherein the second electric circuit is a capacitor connected between another end of the antenna pattern and the system ground, and

wherein the third electric circuit has the inter-digital structure.

6. The antenna apparatus of claim 1, wherein the antenna apparatus is a planar inverted-F antenna.

7. The antenna apparatus of claim 1, wherein the antenna pattern is formed of a metal material,

wherein an end of the antenna pattern is connected to the first electric circuit through a first pad of a Printed Circuit Board (PCB), and

wherein another end of the antenna pattern is connected to the second electric circuit and the third electric circuit through a second pad of the PCB.

8. A mobile terminal comprising:

an antenna apparatus comprising;

an antenna pattern,

a first electric circuit and a second electric circuit respectively connected between both ends of the antenna pattern and a system ground, and

a third electric circuit disposed between the antenna pattern and a feeding line;

a communication unit configured to receive a radio frequency (RF) parameter from a base station;

a memory configured to store a reference RF parameter therein; and

a control unit configured to;

compare the received RF parameter with the reference RF parameter, and

change a device value of a corresponding electric circuit, from among the first electric circuit, the second electric circuit and the third electric circuit, of the antenna apparatus until a comparison value between the received RF parameter and the reference RF parameter satisfies a reference specification when the comparison value is not the reference specification,

wherein the first electric circuit, the second electric circuit, and the third electric circuit extend electrical wavelengths of the antenna pattern.

9. The antenna apparatus of claim 8, wherein the antenna apparatus is a planar inverted-F antenna.

10. The antenna apparatus of claim 8,

wherein the antenna pattern is formed of a metal material,

wherein the end of the antenna pattern is connected to the first electric circuit through a first pad of a printed circuit board (PCB), and

wherein the other end of the antenna pattern is connected to the second electric circuit and the third electric circuit through a second pad of the PCB.

11. A mobile terminal comprising:

an antenna apparatus comprising;

an antenna pattern,

a first electric circuit and a second electric circuit respectively connected between both ends of the antenna pattern and a system ground, and

a third electric circuit disposed between the antenna pattern and a feeding line;

a memory configured to store a reference RF parameter therein; and

a control unit configured to;

measure an RF parameter which is outputted from the antenna apparatus,

compare the measured RF parameter with the reference RF parameter, and

change a device value of a corresponding electric circuit, from among the first electric circuit, the second electric circuit and the third electric circuit, of the antenna apparatus until a comparison value between the measured RF parameter and the reference RF parameter satisfies a reference specification when the comparison value is not the reference specification,

wherein the first electric circuit, the second electric circuit, and the third electric circuit extend electrical wavelengths of the antenna pattern.

12. The antenna apparatus of claim 11, wherein the antenna apparatus is a planar inverted-F antenna.

13. The antenna apparatus of claim 11,

wherein the antenna pattern is formed of a metal material,

wherein an end of the antenna pattern is connected to the first electric circuit through a first pad of a printed circuit board (PCB), and

wherein another end of the antenna pattern is connected to the second electric circuit and the third electric circuit through a second pad of the PCB.

14. A method for controlling a resonance frequency of an antenna of a mobile terminal, the method comprising:

receiving a radio frequency (RF) parameter from a base station;

comparing the received RF parameter with a reference RF parameter stored in a memory of the mobile terminal; and

changing a device value of a corresponding electric circuit of an antenna apparatus until a comparison value between the received RF parameter and the reference RF parameter satisfies a reference specification when the comparison value is not the reference specification,

wherein the antenna apparatus includes an antenna pattern, a first electric circuit and a second electric circuit respectively connected between both ends of the antenna pattern and a system ground, and a third electric circuit disposed between the antenna pattern and a feeding line and the first electric circuit, the second electric circuit, and the third electric circuit extend electrical wavelengths of the antenna pattern.

15. A method for controlling a resonance frequency of an antenna of a mobile terminal, the method comprising:

measuring an output of an antenna apparatus including an antenna pattern, a first electric circuit and a second electric circuit respectively connected between both ends of the antenna pattern and a system ground, and a third electric circuit disposed between the antenna pattern and a feeding line and the first electric circuit, the second electric circuit, and the third electric circuit extend electrical wavelengths of the antenna pattern;

comparing the measured RF parameter with a reference RF parameter; and

changing a device value of a corresponding electric circuit of the antenna apparatus until a comparison value between the measured RF parameter and the reference RF parameter satisfies a reference specification when the comparison value is not the reference specification.