KR20150002347A - Apparatus for matching impedance of dual band antenna - Google Patents

Apparatus for matching impedance of dual band antenna Download PDF

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Publication number
KR20150002347A
KR20150002347A KR1020130076061A KR20130076061A KR20150002347A KR 20150002347 A KR20150002347 A KR 20150002347A KR 1020130076061 A KR1020130076061 A KR 1020130076061A KR 20130076061 A KR20130076061 A KR 20130076061A KR 20150002347 A KR20150002347 A KR 20150002347A
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KR
South Korea
Prior art keywords
path
band
control signal
antenna
ground
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KR1020130076061A
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Korean (ko)
Inventor
이형래
Original Assignee
삼성전기주식회사
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Priority to KR1020130076061A priority Critical patent/KR20150002347A/en
Publication of KR20150002347A publication Critical patent/KR20150002347A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/38—Impedance-matching networks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/38—Impedance-matching networks
    • H03H7/40—Automatic matching of load impedance to source impedance

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

The present invention provides an apparatus for matching the impedance of a dual band antenna which can automatically match impedance to a selected band by varying the impedance of a dual band antenna according to dual band choices. According to the present invention, the apparatus for matching the impedance of a dual band antenna comprises: a path selection unit for selecting one among a first terminal connected to a first path and a second terminal connected to the second path as a common terminal according to a band selection signal; a level conversion unit for providing a control signal by converting the level of the band selection signal; an impedance matching circuit unit for varying impedance according to the control signal by being connected between the common terminal and an antenna.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an impedance matching device for a dual band antenna,

The present invention relates to an impedance matching device for a dual band antenna capable of matching the impedance of a dual band antenna according to the selection of a dual band.

Generally, wireless LAN communication apparatuses that perform wireless LAN communication such as WiFi communication can use frequency bands dealing with each other.

For example, in the early stage, the wireless LAN communication device mainly used a single band of 2.4 GHz, and in such a single band, there was no particular difficulty in antenna matching.

However, in a single wireless LAN communication device, a dual band antenna, which is a public antenna of 2.4 GHz and 5 GHz, comes to be required to commonly use 2.4 GHz and 5 GHz. These dual band antennas have the challenge of impedance matching.

In particular, impedance matching in dual-band antennas has become a more important challenge in terms of achieving optimal antenna performance.

For example, in a dual band antenna, if the impedance is optimized for 2.4 GHz, the impedance will deteriorate at 5 GHz. On the other hand, if the impedance is optimized for 5 GHz, the impedance will deteriorate at 2.4 GHz.

Patent Document 1 described in the following prior art documents relates to a receiver having an internal antenna and a receiver having a built-in antenna and a method of impedance-matching for the same. And does not disclose a technical matter for matching the impedance of the band antenna.

United States Patent Application Publication No. 2005/0255818

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a dual band antenna impedance matching device capable of automatically matching an impedance to a selected band by varying the impedance of the dual band antenna according to the selection of the dual band. Lt; / RTI >

According to a first technical aspect of the present invention, the present invention provides a path selection apparatus comprising: a path selector for selecting one of a first terminal connected to a first path and a second terminal connected to a second path, in accordance with a band selection signal; A level converter for converting a level of the band selection signal and providing a control signal; And an impedance matching circuit unit connected between the common terminal and the antenna, the impedance matching circuit unit varying impedance according to the control signal. Band antenna of the present invention.

According to a second technical aspect of the present invention, the present invention provides a path selection apparatus comprising: a path selector for selecting one of a first terminal connected to a first path and a second terminal connected to a second path, in accordance with a band selection signal; A level converter for converting a level of the band selection signal and providing a control signal; And an impedance matching circuit unit connected between the common terminal and the antenna, the impedance matching circuit unit varying impedance according to the control signal. And the impedance matching circuit unit operates in synchronization with the path selection unit in accordance with the band selection signal and the control signal, and proposes an impedance matching apparatus for a dual band antenna.

According to a third technical aspect of the present invention, the present invention also provides a path selection unit for selecting one of a first terminal connected to a first path and a second terminal connected to a second path, in accordance with a band selection signal; A level converter for converting a level of the band selection signal and providing a control signal; An impedance matching circuit unit connected between the common terminal and the antenna and varying the impedance according to the control signal; And a signal processing unit for providing the band selection signal corresponding to a selected one of the dual bands set in advance and for processing a signal through the path selection unit.

According to a fourth technical aspect of the present invention, the present invention provides a path selection apparatus comprising: a path selector for selecting one of a first terminal connected to a first path and a second terminal connected to a second path in accordance with a band selection signal; A level converter for converting a level of the band selection signal and providing a control signal; An impedance matching circuit unit connected between the common terminal and the antenna and varying the impedance according to the control signal; And a signal processing unit for providing the band selection signal corresponding to a selected one of the dual bands set in advance and for processing a signal through the path selection unit, wherein the impedance matching circuit unit comprises: And a dual band antenna operating in synchronization with the path selecting unit.

In the first, second, third and fourth technical aspects of the present invention, the level converter may include: a first resistor having one end and the other end connected to a pre-set operating voltage terminal; And a PNP junction transistor having an emitter connected to the other end of the first resistor, a base receiving the band selection signal, and a collector connected to the ground; . ≪ / RTI >

Wherein the level converter comprises: a first resistor having one end and the other end connected to a pre-set operating voltage terminal; A PNP junction transistor having an emitter connected to the other end of the first resistor, a base receiving the band selection signal, and a collector; And a second resistor coupled between the collector of the PNP junction transistor and ground; . ≪ / RTI >

Wherein the impedance matching circuit unit includes: an inductance circuit unit having at least one inductor connected between a common terminal of the path selecting unit and the antenna; And a variable capacitance circuit part connected between one end of the inductance circuit part and the ground and having a capacitance variable according to the control signal; . ≪ / RTI >

The variable capacitance circuit portion includes: a first capacitor connected between one end of the inductance circuit portion and the ground; And a switch capacitor circuit connected in parallel to the first capacitor; Wherein the switch capacitor circuit includes a second capacitor and a first switch element connected in series, and the first switch element may be configured to perform a switching operation in accordance with the control signal.

The variable capacitance circuit portion may include a varactor diode connected between one end of the inductance circuit portion and the ground and having a capacitance that varies according to the control signal.

In the third and fourth aspects of the present invention, the signal processing unit may include: a switching controller for providing the band selection signal corresponding to a selected one of the dual bands; A 2.4 GHz processor for processing a 2.4 GHz WiFi signal on a first path selected by the path selector; And a 5 GHz processor for processing a 5 GHz WiFi signal through a second path selected by the path selector; . ≪ / RTI >

According to the present invention, by changing the impedance of the dual band antenna according to the selection of the dual band, it is possible to automatically match the impedance to the selected band.

1 is a view illustrating a first embodiment of an impedance matching apparatus for a dual band antenna according to an embodiment of the present invention.
2 is a view illustrating a second embodiment of an impedance matching apparatus for a dual band antenna according to an embodiment of the present invention.
3 is a first schematic circuit diagram of a level converter according to an embodiment of the present invention.
4 is a second schematic circuit diagram of a level converter according to an embodiment of the present invention.
5 is an implementation circuit diagram of an impedance matching circuit according to an embodiment of the present invention.
6 is a first schematic circuit diagram of a variable capacitance circuit according to an embodiment of the present invention.
7 is a second schematic circuit diagram of a variable capacitance circuit according to an embodiment of the present invention.
8 is a characteristic graph of a variable capacitance circuit according to an embodiment of the present invention.

It should be understood that the present invention is not limited to the embodiments described and that various changes may be made without departing from the spirit and scope of the present invention.

In addition, in each embodiment of the present invention, the structure, shape, and numerical values described as an example are merely examples for helping understanding of the technical matters of the present invention, so that the spirit and scope of the present invention are not limited thereto. It should be understood that various changes may be made without departing from the spirit of the invention.

In the drawings referred to in the present invention, components having substantially the same configuration and function as those of the present invention will be denoted by the same reference numerals.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

1 is a view illustrating a first embodiment of an impedance matching apparatus for a dual band antenna according to an embodiment of the present invention.

Referring to FIG. 1, an apparatus for impedance matching of a dual band antenna according to an embodiment of the present invention may include a path selecting unit 100, a level converting unit 200, and an impedance matching circuit unit 300.

2 is a view illustrating a second embodiment of an impedance matching apparatus for a dual band antenna according to an embodiment of the present invention.

2, an apparatus for impedance matching of a dual band antenna according to an embodiment of the present invention includes a path selecting unit 100, a level converting unit 200, an impedance matching circuit unit 300, and a signal processing unit 400 can do.

1 and 2, the path selecting unit 100 selects one of the first terminal T1 connected to the first path PH1 and the second terminal T1 connected to the second path PH1 according to the band selection signal SW, And the second terminal T2 connected to the second terminal PH2.

The first path PH1 may be a path for a 2.4 GHz WiFi band, the second path PH2 may be a path for a 5 GHz WiFi band, the first path PH1 and the second path PH2, Is a path for transmitting different frequency signals, and is not limited to the above example.

The level converting unit 200 may convert the level of the band selection signal SW to provide the control signal SC.

For example, when the level of the band selection signal SW is not suitable for the control of the impedance matching circuit unit 300, it is necessary to convert the level to a level suitable for the control of the impedance matching circuit unit 300.

The impedance matching circuit unit 300 may be connected between the common terminal TC and the antenna to vary the impedance according to the control signal SC.

Here, if the antenna ANT of the present invention is a dual band antenna, the impedance should be adjusted according to the selected band. For example, if the dual band is a 2.4GHz band and a 5GHz band, if the 2.4GHz band is selected, the impedance should be optimized for 2.4GHz, and if the 5GHz band is selected, the impedance should be optimized for the 5GHz band.

In particular, the impedance matching circuit unit 300 may operate in synchronization with the path selection unit 100 according to the band selection signal SW and the control signal SC.

2, the signal processing unit 400 may provide the band selection signal SW corresponding to a selected one of the preset dual bands, and may process the signal through the path selection unit 100 have.

For example, the signal processing unit 400 may include a switching control unit 51, a 2.4 GHz processing unit 52, and a 5 GHz processing unit 53.

The switching controller 51 may provide the band selection signal SW corresponding to a selected one of the dual bands to the path selector 100 and the level converter 300.

The 2.4 GHz processing unit 52 can process the 2.4 GHz WiFi signal through the first path PH1 selected by the path selecting unit 100. [

The 5 GHz processing unit 53 may include processing a 5 GHz WiFi signal through the second path PH2 selected by the path selecting unit 100. [

The impedance matching circuit unit 300 may operate in synchronization with the path selection unit 100 under the control of the signal processing unit 400.

For example, when the path selecting unit 100 connects the common terminal TC to the first terminal T1 for the selection of the first path PH1, which is a 2.4 GHz WiFi band, the impedance matching circuit unit 300, Can be varied to an impedance matched to the 2.4 GHz WiFi band.

Alternatively, if the path selector 100 connects the common terminal TC to the second terminal T2 for the selection of the second path PH2, which is a 5 GHz WiFi band, the impedance matching circuit part 300 also has a 5 GHz The impedance can be varied to match the WiFi band.

3 is a first schematic circuit diagram of a level converter according to an embodiment of the present invention.

3, the level converter 200 includes a first resistor R11 having one end and the other end connected to a pre-set operation voltage Vcc, and a second resistor R11 connected to the other end of the first resistor R11 Emitter, a base for receiving the band selection signal SW, and a collector connected to the ground.

When the band selection signal SW is at a high level (for example, 3V), the PNP junction transistor Q1 is turned off and the control signal SC Is converted to a level of 3.3 V which is the operating voltage Vcc. In addition, when the band selection signal SW is at a low level, the PNP junction transistor Q1 is turned on, and the control signal SC becomes the ground level OV.

4 is a second schematic circuit diagram of a level converter according to an embodiment of the present invention.

4, the level converting unit 200 includes a first resistor R11 having one end and the other end connected to a pre-set operating voltage Vcc, and a second resistor R11 connected to the other end of the first resistor R11 And a second resistor R12 connected between the collector of the PNP junction transistor Q1 and the ground. The PNP junction transistor Q1 has a base and a collector receiving the band select signal SW, can do.

Here, if the operation voltage Vcc is 3.3V and the first and second resistors R11 and R12 are 100K, respectively, when the band selection signal SW is at a high level (for example, 3V) The PNP junction transistor Q1 is turned off and the control signal SC is converted to a level of 3.3 V which is the operation voltage Vcc. When the band selection signal SW is at a low level, the PNP junction transistor Q1 is turned on, and the control signal SC indicates that the operation voltage Vcc is higher than the first and second resistors R11, R12) to 1.65V.

5 is an implementation circuit diagram of an impedance matching circuit according to an embodiment of the present invention.

Referring to FIG. 5, the impedance matching circuit unit 300 may include an inductance circuit unit 310 and a variable capacitance circuit unit 320.

The inductance circuit unit 310 may include at least one inductor connected between the common terminal of the path selector 100 and the antenna.

The variable capacitance circuit unit 320 may be connected between one end of the inductance circuit unit 310 and the ground and may provide a variable capacitance according to the control signal SC.

Here, the variable capacitance circuit unit 320 may include at least one of a switched variable capacitance circuit and a variable capacitance element.

The switchable variable capacitance circuit is a circuit including a switch and a capacitor, and the capacitance can be varied by connecting or disconnecting the capacitor according to the operation of the switch. The variable capacitance element may be a varactor diode or the like.

An example of the variable capacitance circuit unit 320 will be described with reference to FIGS. 6 and 7. FIG. The description of the operations overlapping with the operations described with reference to Figs. 1 to 5 may be omitted.

6 is a first schematic circuit diagram of a variable capacitance circuit according to an embodiment of the present invention.

6, the variable capacitance circuit unit 320 includes a first capacitor C11 connected between one end of the inductance circuit unit 310 and the ground, a switch capacitor circuit C11 connected in parallel to the first capacitor C11, Lt; RTI ID = 0.0 > 321 < / RTI >

At this time, the switch capacitor circuit 321 is connected in series with the second capacitor C12 and the first switch element SW11, and the first switch element SW11 is switched according to the control signal SC .

7 is a second schematic circuit diagram of a variable capacitance circuit according to an embodiment of the present invention. Referring to FIG. 7, the variable capacitance circuit unit 320 may include a varactor diode VD.

At this time, the varactor diode VD is connected between one end of the inductance circuit part 310 and the ground, and can provide a variable capacitance according to the control signal SC.

8 is a characteristic graph of a variable capacitance circuit according to an embodiment of the present invention. Referring to FIG. 8, the voltage level and the capacitance of the control signal SC are inversely proportional to each other.

According to this characteristic, it can be seen that the capacitance can be varied by adjusting the voltage level of the control signal SC.

100: Path selection unit
200:
300: Impedance matching circuit
310: Inductance circuit part
320: Variable capacitance circuit part
321: Switch capacitor circuit
400: Signal processor
SW: band selection signal
SC: control signal
Q1: PNP junction type transistor
R11: first resistance
R12: second resistance
C11: First capacitor
C12: the second capacitor
SW11: first switch element
VD: varactor diode

Claims (26)

A path selector for selecting one of a first terminal connected to the first path and a second terminal connected to the second path according to the band selection signal;
A level converter for converting a level of the band selection signal and providing a control signal; And
An impedance matching circuit unit connected between the common terminal and the antenna and varying the impedance according to the control signal;
Band antenna.
The apparatus according to claim 1,
A first resistor having one end and the other end connected to a pre-set operating voltage terminal; And
A PNP junction transistor having an emitter connected to the other end of the first resistor, a base receiving the band selection signal, and a collector connected to ground;
Band antenna.
The apparatus according to claim 1,
A first resistor having one end and the other end connected to a pre-set operating voltage terminal;
A PNP junction transistor having an emitter connected to the other end of the first resistor, a base receiving the band selection signal, and a collector; And
A second resistor coupled between the collector of the PNP junction transistor and ground;
Band antenna.
The impedance matching circuit according to claim 1,
An inductance circuit part having at least one inductor connected between a common terminal of the path selecting part and the antenna; And
A variable capacitance circuit part connected between one end of the inductance circuit part and the ground and having a capacitance variable according to the control signal;
Band antenna.
The variable capacitance circuit according to claim 4,
A first capacitor connected between one end of the inductance circuit part and the ground; And
A switch capacitor circuit connected in parallel to the first capacitor; Lt; / RTI >
Wherein the switch capacitor circuit includes a second capacitor and a first switch element connected in series, and the first switch element performs a switching operation in accordance with the control signal.
The variable capacitance circuit according to claim 4,
And a varactor diode connected between one end of the inductance circuit part and the ground and having a capacitance variable according to the control signal.
A path selector for selecting one of a first terminal connected to the first path and a second terminal connected to the second path according to the band selection signal;
A level converter for converting a level of the band selection signal and providing a control signal; And
An impedance matching circuit unit connected between the common terminal and the antenna and varying the impedance according to the control signal; Lt; / RTI >
And the impedance matching circuit unit operates in synchronization with the path selection unit according to the band selection signal and the control signal.
8. The apparatus according to claim 7,
A first resistor having one end and the other end connected to a pre-set operating voltage terminal; And
A PNP junction transistor having an emitter connected to the other end of the first resistor, a base receiving the band selection signal, and a collector connected to ground;
Band antenna.
8. The apparatus according to claim 7,
A first resistor having one end and the other end connected to a pre-set operating voltage terminal;
A PNP junction transistor having an emitter connected to the other end of the first resistor, a base receiving the band selection signal, and a collector; And
A second resistor coupled between the collector of the PNP junction transistor and ground;
Band antenna.
The impedance matching circuit according to claim 7,
An inductance circuit part having at least one inductor connected between a common terminal of the path selecting part and the antenna; And
A variable capacitance circuit part connected between one end of the inductance circuit part and the ground and having a capacitance variable according to the control signal;
Band antenna.
The variable capacitance circuit according to claim 10,
A first capacitor connected between one end of the inductance circuit part and the ground; And
A switch capacitor circuit connected in parallel to the first capacitor; Lt; / RTI >
Wherein the switch capacitor circuit includes a second capacitor and a first switch element connected in series, and the first switch element performs a switching operation in accordance with the control signal.
11. The variable matching circuit according to claim 10,
And a varactor diode connected between one end of the inductance circuit part and the ground and having a capacitance variable according to the control signal.
A path selector for selecting one of a first terminal connected to the first path and a second terminal connected to the second path according to the band selection signal;
A level converter for converting a level of the band selection signal and providing a control signal;
An impedance matching circuit unit connected between the common terminal and the antenna and varying the impedance according to the control signal; And
A signal processor for providing the band selection signal corresponding to a selected one of the preset dual bands and processing a signal through the path selector;
Band antenna.
14. The apparatus according to claim 13,
A first resistor having one end and the other end connected to a pre-set operating voltage terminal; And
A PNP junction transistor having an emitter connected to the other end of the first resistor, a base receiving the band selection signal, and a collector connected to ground;
Band antenna.
14. The apparatus according to claim 13,
A first resistor having one end and the other end connected to a pre-set operating voltage terminal;
A PNP junction transistor having an emitter connected to the other end of the first resistor, a base receiving the band selection signal, and a collector; And
A second resistor coupled between the collector of the PNP junction transistor and ground;
Band antenna.
14. The impedance matching circuit according to claim 13,
An inductance circuit part having at least one inductor connected between a common terminal of the path selecting part and the antenna; And
A variable capacitance circuit part connected between one end of the inductance circuit part and the ground and having a capacitance variable according to the control signal;
Band antenna.
The variable capacitance circuit according to claim 16,
A first capacitor connected between one end of the inductance circuit part and the ground; And
A switch capacitor circuit connected in parallel to the first capacitor; Lt; / RTI >
Wherein the switch capacitor circuit includes a second capacitor and a first switch element connected in series, and the first switch element performs a switching operation in accordance with the control signal.
18. The variable capacitance circuit according to claim 17,
And a varactor diode connected between one end of the inductance circuit part and the ground and having a capacitance variable according to the control signal.
14. The signal processing apparatus according to claim 13,
A switching controller for providing the band selection signal corresponding to a selected one of the dual bands;
A 2.4 GHz processor for processing a 2.4 GHz WiFi signal on a first path selected by the path selector; And
A 5 GHz processor for processing a 5 GHz WiFi signal through a second path selected by the path selector;
Band antenna.
A path selector for selecting one of a first terminal connected to the first path and a second terminal connected to the second path according to the band selection signal;
A level converter for converting a level of the band selection signal and providing a control signal;
An impedance matching circuit unit connected between the common terminal and the antenna and varying the impedance according to the control signal; And
And a signal processing unit for providing the band selection signal corresponding to a selected one of the preset dual bands and processing a signal through the path selection unit,
Wherein the impedance matching circuit unit operates in synchronism with the path selection unit under the control of the signal processing unit.
21. The apparatus according to claim 20,
A first resistor having one end and the other end connected to a pre-set operating voltage terminal; And
A PNP junction transistor having an emitter connected to the other end of the first resistor, a base receiving the band selection signal, and a collector connected to ground;
Band antenna.
21. The apparatus according to claim 20,
A first resistor having one end and the other end connected to a pre-set operating voltage terminal;
A PNP junction transistor having an emitter connected to the other end of the first resistor, a base receiving the band selection signal, and a collector; And
A second resistor coupled between the collector of the PNP junction transistor and ground;
Band antenna.
21. The impedance matching circuit according to claim 20,
An inductance circuit part having at least one inductor connected between a common terminal of the path selecting part and the antenna; And
A variable capacitance circuit part connected between one end of the inductance circuit part and the ground and having a capacitance variable according to the control signal;
Band antenna.
The variable capacitance circuit according to claim 23,
A first capacitor connected between one end of the inductance circuit part and the ground; And
A switch capacitor circuit connected in parallel to the first capacitor; Lt; / RTI >
Wherein the switch capacitor circuit includes a second capacitor and a first switch element connected in series, and the first switch element performs a switching operation in accordance with the control signal.
The variable capacitance circuit according to claim 24,
A varactor diode connected between one end of the inductance circuit part and the ground and having a variable capacitance according to the control signal,
Band antenna.
The signal processing apparatus according to claim 20,
A switching controller for providing the band selection signal corresponding to a selected one of the dual bands;
A 2.4 GHz processor for processing a 2.4 GHz WiFi signal on a first path selected by the path selector; And
A 5 GHz processor for processing a 5 GHz WiFi signal through a second path selected by the path selector;
Band antenna.
KR1020130076061A 2013-06-28 2013-06-28 Apparatus for matching impedance of dual band antenna KR20150002347A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200101197A (en) * 2019-02-19 2020-08-27 삼성전자주식회사 Signal processing circuit and an electronic device having the signal processing circuit thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200101197A (en) * 2019-02-19 2020-08-27 삼성전자주식회사 Signal processing circuit and an electronic device having the signal processing circuit thereof
WO2020171528A1 (en) * 2019-02-19 2020-08-27 삼성전자 주식회사 Signal processing circuit and electronic device comprising same
US11888508B2 (en) 2019-02-19 2024-01-30 Electronics Co., Ltd Signal processing circuit and electronic device comprising same

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