KR101683909B1 - System for optimizing matching of radio frequency in matching impedence of antenna - Google Patents

System for optimizing matching of radio frequency in matching impedence of antenna Download PDF

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Publication number
KR101683909B1
KR101683909B1 KR1020100109279A KR20100109279A KR101683909B1 KR 101683909 B1 KR101683909 B1 KR 101683909B1 KR 1020100109279 A KR1020100109279 A KR 1020100109279A KR 20100109279 A KR20100109279 A KR 20100109279A KR 101683909 B1 KR101683909 B1 KR 101683909B1
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KR
South Korea
Prior art keywords
antenna
variable capacitor
antenna impedance
range
impedance matching
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KR1020100109279A
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Korean (ko)
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KR20120047615A (en
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박동찬
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엘지이노텍 주식회사
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Priority to KR1020100109279A priority Critical patent/KR101683909B1/en
Priority to PCT/KR2011/008389 priority patent/WO2012060665A2/en
Publication of KR20120047615A publication Critical patent/KR20120047615A/en
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Publication of KR101683909B1 publication Critical patent/KR101683909B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages

Abstract

The present invention relates to an antenna impedance matching circuit for outputting mutual impedance values between antenna impedances; At least one variable capacitor electrically coupled to the antenna impedance matching circuit to detect mutual impedance values between the antenna impedances from the antenna impedance matching circuit and provided to the antenna impedance matching circuit to match the mutual impedance values between the antenna impedances to be compensated, An antenna impedance adjuster for matching the antenna impedances with each other by adjusting a voltage; The antenna impedance matching circuit is electrically connected to the antenna impedance matching unit, and when the impedance of the current antenna is matched with the antenna impedance of the antenna impedance, the adjusted at least one variable capacitor value output from the antenna impedance matching circuit using a lookup table And at least one variable capacitor value adjusted by comparing with the region ranges of the reference variable capacitor which is already stored and divided by the coordinates is divided into the range of the reference variable capacitor of one of the region ranges of the reference variable capacitor A first antenna for storing a radio frequency band point in a range of one reference variable capacitor while matching at least one tunable capacitor value adjusted to a radio frequency band point in a range of one reference variable capacitor and optimizingRadio frequency impedance matching unit for matching optimization; And an antenna impedance matching circuit that is electrically connected to the antenna impedance matching unit and adjusts at least one adjusted variable output from the antenna impedance matching circuit using a prediction algorithm when the impedance of the next antenna among the antenna impedances matches each other, And the coordinates of the at least one variable capacitor value adjusted when the adjusted at least one variable capacitor value is the range of the other one of the reference variable capacitors of the range of ranges of the reference variable capacitor, Matching is performed from a radio frequency band point in a range of one first reference variable capacitor stored through an antenna impedance matching optimizing radio frequency matching optimizer to a radio frequency band point in a range of another reference variable capacitor to optimize And a second antenna impedance matching optimizing unit for optimizing the impedance matching of the second antenna.

Description

[Technical Field] The present invention relates to a radio frequency matching optimization system for an antenna impedance matching,

Embodiments relate to a radio frequency matching optimization system for antenna impedance matching.

In general, an antenna impedance matching method is a method of matching impedances to each other so that energy of a specific frequency can be efficiently transmitted and received between wireless communication devices.

In recent years, it has been found that by quickly scanning the adjusted variable capacitor value output from the antenna impedance matching circuit and providing the transmission / reception signal with an efficient radio frequency band, the impedance of the antenna is matched with each other within a short period of time and the distortion rate of the transmission / An improved antenna impedance matching system capable of continuously maintaining the signal sensitivity of the transmission and reception signals has been continuously carried out.

The radio frequency matching optimization system for matching the antenna impedance according to the embodiment can continuously prevent the degradation of the distortion rate of the transmission / reception signal while matching the impedance of the antenna with each other within a short period of time to continuously maintain the signal sensitivity of the transmission / do.

An RF impedance matching system for antenna impedance matching according to an embodiment of the present invention includes an antenna impedance matching circuit for outputting mutual impedance values between antenna impedances; At least one variable capacitor electrically coupled to the antenna impedance matching circuit to detect mutual impedance values between the antenna impedances from the antenna impedance matching circuit and provided to the antenna impedance matching circuit to match the mutual impedance values between the antenna impedances to be compensated, An antenna impedance adjuster for matching the antenna impedances with each other by adjusting a voltage; The antenna impedance matching circuit is electrically connected to the antenna impedance matching unit, and when the impedance of the current antenna is matched with the antenna impedance of the antenna impedance, the adjusted at least one variable capacitor value output from the antenna impedance matching circuit using a lookup table And at least one variable capacitor value adjusted by comparing with the region ranges of the reference variable capacitor which is already stored and divided by the coordinates is divided into the range of one reference capacitor of the reference variable capacitor A first antenna for storing a radio frequency band point in a range of one reference variable capacitor while matching at least one tunable capacitor value adjusted to a radio frequency band point in a range of one reference variable capacitor and optimizing Radio frequency impedance matching unit for matching optimization; And an antenna impedance matching circuit that is electrically connected to the antenna impedance matching unit and adjusts at least one adjusted variable output from the antenna impedance matching circuit using a prediction algorithm when the impedance of the next antenna among the antenna impedances matches each other, And the coordinates of the at least one variable capacitor value adjusted when the adjusted at least one variable capacitor value is the range of the other one of the reference variable capacitors of the range of ranges of the reference variable capacitor, Matching is performed from a radio frequency band point in a range of one first reference variable capacitor stored through an antenna impedance matching optimizing radio frequency matching optimizer to a radio frequency band point in a range of another reference variable capacitor to optimize And a second antenna impedance matching radio frequency matching optimizer.

The radio frequency matching optimization system for matching the antenna impedance according to the embodiment can continuously prevent the degradation of the distortion rate of the transmission / reception signal while matching the antenna impedance with each other within a short period of time, thereby continuously maintaining the signal sensitivity of the transmission / It is effective.

1 is a block diagram illustrating a radio frequency matching optimization system for antenna impedance matching using a predication algorithm according to an embodiment of the present invention.
FIG. 2 is a block diagram specifically showing a circuit diagram of the antenna impedance matching circuit shown in FIG. 1 and an antenna impedance adjusting unit. FIG.
FIG. 3A is a diagram for explaining a method of setting the adjusted variable capacitor value as coordinates when the current antenna impedances are matched with each other by using a lookup table of the radio frequency matching optimizer for first antenna impedance matching shown in FIG. 1 and FIG. 2 Graph showing status.
FIG. 3B is a diagram illustrating a lookup table of a radio frequency matching optimizer for first antenna impedance matching shown in FIGS. 1 and 2. When coordinates of current antenna impedances are matched with each other, coordinates of the adjusted variable capacitor values are searched Graph showing status.
FIG. 4A is a diagram illustrating a case where the adjusted antenna impedance is matched to each other using a prediction algorithm of the radio frequency matching optimizer for second antenna impedance matching shown in FIGS. 1 and 2, and the adjusted variable capacitor value is set as coordinates A graph showing a state.
FIG. 4B is a diagram for explaining a case where the next antenna impedance is matched with each other by using a prediction algorithm of the radio frequency matching optimizer for second antenna impedance matching shown in FIG. 1 and FIG. 2, A graph showing a state.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a radio frequency matching optimization system for antenna impedance matching using a predication algorithm according to an embodiment of the present invention.

2 is a block diagram specifically showing a circuit diagram of the antenna impedance matching circuit shown in FIG. 1 and an antenna impedance adjusting unit.

FIG. 3A is a diagram for explaining a method of setting the adjusted variable capacitor value as coordinates when the current antenna impedances are matched with each other by using a lookup table of the radio frequency matching optimizer for first antenna impedance matching shown in FIG. 1 and FIG. 2 Fig.

FIG. 3B is a diagram illustrating a lookup table of a radio frequency matching optimizer for first antenna impedance matching shown in FIGS. 1 and 2. When coordinates of current antenna impedances are matched with each other, coordinates of the adjusted variable capacitor values are searched Fig.

FIG. 4A is a diagram illustrating a case where the adjusted antenna impedance is matched to each other using a prediction algorithm of the radio frequency matching optimizer for second antenna impedance matching shown in FIGS. 1 and 2, and the adjusted variable capacitor value is set as coordinates FIG.

FIG. 4B is a diagram for explaining a case where the next antenna impedance is matched with each other by using a prediction algorithm of the radio frequency matching optimizer for second antenna impedance matching shown in FIGS. 1 and 2, FIG.

1 and 2, the system 100 for matching an antenna impedance using a greedy algorithm according to an exemplary embodiment of the present invention includes an antenna impedance matching circuit 102, an antenna impedance adjustment unit 104, A first antenna impedance matching radio frequency matching optimizer 106, a second antenna impedance matching radio frequency matching optimizer 108, and the like.

An antenna impedance matching circuit 102 is provided to output mutual impedance values between current antenna impedances.

The antenna impedance adjustment unit 104 is electrically connected to the antenna impedance matching circuit 102 and receives the antenna impedances Z 1 and Z 2 from the antenna impedance matching circuit 102, Z ANT ) are detected, and antenna impedances (Z 1 , As Z ANT) at least one variable capacitor (VC1, VC2) provided in the antenna impedance matching circuit 102 according to the mutual impedance between the antenna impedance values (Z 1, Z ANT ), the impedance of the antenna (Z 1 , Z ANT ) to each other.

At this time, the antenna impedance adjusting unit 104 may be provided including a micro controller unit (MCU).

More specifically, the antenna impedance adjustment unit 104 may include an antenna impedance detection unit 104a, an antenna impedance control unit 104b, a digital-analog conversion unit 104c, an antenna impedance adjustment unit 104d, and the like.

Antenna impedance detecting means (104a) includes an antenna impedance matching the antenna impedance from circuit 102 and is electrically connected to the antenna impedance matching circuit 102 (Z 1, Z ANT ), respectively.

Antenna impedance control means (104b) has a current antenna impedance detected from the antenna impedance detecting means (104a) and is electrically connected to the antenna impedance detecting means (104a) (Z 1, Z ANT ) from the stored reference antenna impedances Z 1 , Z ANT ) is compared with the mutual impedance values between the antenna impedances (Z 1 , RTI ID = 0.0 > Z ANT. ≪ / RTI >

Digital-to-analog conversion means (104c) to the antenna impedance control means (104b) and is electrically connected to the antenna impedance to be compensated antenna impedance to be supplied from the control means (104b) (Z 1, Z ANT ) to an analog signal.

Antenna impedance adjusting means (104d) is a digital-to-analog conversion means (104c) and is electrically connected to a digital-to-analog conversion means (104c) to be transformed antenna impedance compensated by (Z 1, Z ANT ) is received and an antenna impedance (Z 1 , As Z ANT) at least one variable capacitor (VC1, VC2) provided in the antenna impedance matching circuit 102 according to the mutual impedance between the antenna impedance values (Z 1, Z ANT ), the impedance of the antenna (Z 1 , Z ANT ) to each other.

At this time, at least one variable capacitor (VC1, VC2) is the antenna impedance (Z 1, Z ANT ) and a second variable capacitor (VC2), which are electrically connected to each other and are connected in parallel with each other.

The first antenna impedance matching radio frequency matching optimizer 106 is electrically connected to the antenna impedance matching circuit 102 so that when the current antenna impedances of the antenna impedances are matched with each other through the antenna impedance adjuster 104, is provided to set to a look-up table (lookup table), the antenna impedance matching circuit 102 adjusts at least one variable capacitor value (VC1, VC2) outputted from using the coordinates (P 1) as shown.

3B, the first antenna impedance matching radio frequency matching optimizer 106 compares the range of the reference variable capacitors R 1 , R 2 , and R 3 that are already stored and divided by the coordinates, respectively, when the at least one variable capacitor value (VC1, VC2) is based on the extent of the variable capacitors (R 1, R 2, R 3) a reference variable extent (R 3) of the capacitor of adjustment as compared to, adjusting at least one variable capacitor value (VC1, VC2) to a reference area of the variable capacitors range (R 3) the extent (R 3) of one of the reference variable capacitor while optimized by matching the radio frequency band to point in the Is provided to store a radio frequency band point.

In this case, the region ranges (R 1 , R 2 , R 3 ) of the reference variable capacitor can be set by dividing the regions of the reference variable capacitor into regions having a constant size without being overlapped with each other. Size area without being overlapped with each other.

In other words, as shown in FIG. 3B, the first antenna impedance matching radio frequency matching optimizer 106 determines that the adjusted at least one variable capacitor value (VC1, VC2) is within the range of the reference variable capacitor R 1 , R 2, a can be sequentially seoching that R 3) of the one of the reference region range (R 3) of the variable capacitor.

Thereafter, a first antenna impedance radio frequency matching optimization unit 106 for matching the at least one variable capacitor value to adjust the coordinates of (VC1, VC2), (P 1), the region range of a reference variable capacitor (R 3) If the coordinates of the outside position, based on the extent of the variable capacitors (R 1, R 2, R 3) region of the variable capacitor based on the position outside of the range (R 2) is can be skipped.

Thereafter, the first antenna impedance matching radio frequency matching optimizer 106 compares the coordinates (P 1 , V 2 ) of the adjusted at least one variable capacitor value (VC 1, VC 2 ) in the range R 3 of one reference variable capacitor (P 1 ) of the adjusted at least one variable capacitor value (VC 1, VC 2 ) in the region range (R 3 ) of one reference variable capacitor to be searched is compared with the coordinates (P 1 ) of the one reference variable capacitor It is possible to optimize by matching with a radio frequency band point in the region range (R 3 ).

The second antenna impedance matching radio frequency matching optimizer 108 is electrically connected to the antenna impedance matching circuit 102 and when the impedance of the next antenna among the antenna impedances is matched with each other through the antenna impedance adjuster 104, Is provided to set the adjusted at least one variable capacitor value (VC1, VC2) output from the antenna impedance matching circuit 102 to the coordinates (P 2 ) using a prediction algorithm as shown.

4B, the second antenna impedance matching radio frequency matching optimizer 108 compares the adjusted at least one variable capacitor value (VC1, VC2) with the adjusted range of the reference variable capacitor R 1 , R 2 , R 3 , R 4) when one of the other one of the reference variable region range (R 4) of the capacitor, and adjusting at least one variable capacitor value (VC1, VC2) coordinates (P 2) a first antenna impedance matching optimized radio frequency matching for the (R 3 ) of a first reference variable capacitor stored through a first reference variable capacitor (106) and a radio frequency band point in a region range (R 4 ) of another reference variable capacitor after searching from a radio frequency band point in a first reference variable capacitor To < / RTI >

At this time, the range of the reference variable capacitor (R 1 , R 2 , R 3 , R 4 ) can be set by dividing the coordinates into areas of a constant size so as not to overlap each other.

In other words, as shown in FIG. 4B, the second antenna impedance matching matching radio frequency matching optimizer 108 determines that the adjusted at least one variable capacitor value (VC1, VC2) is within the range of the reference variable capacitor R 1 , R 2 , R 3 , R 4 ) of the other reference variable capacitor in the range R 4 of the reference variable capacitor.

The second antenna impedance matching radio frequency matching optimizer 108 compares the coordinate P 2 of at least one variable capacitor value VC 1 and the adjusted variable capacitor value VC 2 to the range R 4 of one reference variable capacitor, (R 1 , R 2 , R 3 , and R 4) of the reference variable capacitor, R 4) extent (R 1, R 2) of the reference variable capacitor in a position outside of which it is possible to skip.

At this time, the second antenna impedance matching radio frequency matching optimizer 108 adjusts the coordinates (P 2 ) of the adjusted at least one variable capacitor value (VC1, VC2) to the first antenna impedance matching radio frequency matching optimizer 106 ) after a seoching from radio frequency band to the point that the stored one of the first reference variable capacitor extent (R 3) with, by matching the radio frequency band to point in a different one of the reference area of the variable capacitors range (R 4) Can be optimized.

The radio frequency matching optimization system 100 for matching an antenna impedance according to an embodiment of the present invention includes an antenna impedance matching circuit 102, an antenna impedance adjuster 104, a first antenna impedance matching radio frequency matching optimizer A second antenna impedance matching radio frequency matching optimizer 108, and the like.

Therefore, the radio frequency matching optimization system 100 for antenna impedance matching according to an embodiment of the present invention adjusts the impedance of the antenna 100 by adjusting the impedance value of the adjusted variable capacitor value VC1 , And VC2 while quickly transmitting and receiving signals in a radio frequency band with high efficiency.

Accordingly, the radio frequency matching optimization system 100 for matching the antenna impedance according to an embodiment of the present invention can continuously prevent the degradation of the distortion rate of the transmission / reception signal while matching the antenna impedance with each other within a short period of time, So that the signal sensitivity of the signal can be continuously maintained.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

100: Radio Frequency Matching Optimization System for Antenna Impedance Matching
102: antenna impedance matching circuit 104: antenna impedance adjusting section
104a: Antenna impedance detection means 104b: Antenna impedance control means
104c: Digital-analog converting means 104d: Antenna impedance adjusting means
106: radio frequency matching optimizer for first antenna impedance matching
108: a second antenna impedance matching radio frequency matching optimizer

Claims (8)

An antenna impedance matching circuit for outputting mutual impedance values between the antenna impedances;
And at least one variable capacitor provided in the antenna impedance matching circuit, the impedance matching circuit being electrically connected to the antenna impedance matching circuit to detect mutual impedance values between the antenna impedances from the antenna impedance matching circuit and to match mutual impedance values between antenna impedances to be compensated. An antenna impedance adjuster for matching the antenna impedances with each other by adjusting a voltage across the antenna impedances;
And an antenna impedance matching circuit which is electrically connected to the antenna impedance matching unit and adjusts at least one of the adjusted at least one antenna impedance by using a lookup table when the current antenna impedance of the antenna impedance matches each other through the antenna impedance adjusting unit. And the adjusted at least one variable capacitor value is compared with one of the reference ranges of the reference variable capacitor by comparing the adjusted range of the reference capacitor with the range of the reference variable capacitor which is already stored and divided by the coordinates, Wherein the tuning circuit adjusts the tuned at least one variable capacitor value to a radio frequency band point in the range of the one reference variable capacitor to optimize the tuned at least one tunable capacitor value in the range of the variable capacitor, A first antenna radio frequency impedance matching unit for matching optimization to save the band points; And
And an antenna impedance matching circuit which is electrically connected to the antenna impedance matching circuit, and when the impedance of the next antenna among the antenna impedances is matched with each other through the antenna impedance adjusting unit, And when the adjusted at least one variable capacitor value is in the range of the other one of the reference ranges of the reference variable capacitor, the adjusted at least one variable capacitor Values are searched from a radio frequency band point in the range of the one first reference variable capacitor stored through the first antenna impedance matching radio frequency matching optimizing unit to the range of the other reference variable capacitor And a second antenna impedance matching optimizing unit for optimizing the second antenna impedance matching to a radio frequency band point of the first antenna.
The method according to claim 1,
Wherein the first antenna impedance matching radio frequency matching optimizer comprises:
Wherein when the adjusted at least one variable capacitor value is successively searched for whether the adjusted variable capacitor value is in the range of one reference capacitor among the range of the reference variable capacitor,
Wherein when the coordinates of the adjusted at least one variable capacitor are located outside the coordinates of the one range of the reference variable capacitor, the range of the reference variable capacitor at a position deviated from the range of the reference variable capacitor is Skipped,
After the coordinates of the adjusted at least one variable capacitor value in the region range of the one reference variable capacitor are detected and the coordinates of the adjusted at least one variable capacitor value in the range of the one reference variable capacitor Wherein the coordinates are matched to a radio frequency band point in a range of the one reference variable capacitor to optimize the antenna frequency matching.
The method according to claim 1,
Wherein the second antenna impedance matching radio frequency matching optimizer comprises:
When the adjusted at least one variable capacitor value is successively searched to determine whether the adjusted variable capacitor value is within the range of the other one of the reference variable capacitors,
Wherein when the coordinates of the adjusted at least one variable capacitor value are located at positions out of the coordinates of the other reference capacitor range, the range of the reference variable capacitor at a position deviated from the range of the reference variable capacitor Is skipped,
After the coordinate of the adjusted at least one variable capacitor value is searched from a radio frequency band point in the range of the one first reference variable capacitor stored through the first antenna impedance matching radio frequency matching optimizer,
And a second antenna impedance matching optimizing unit for optimizing the second antenna impedance matching with a radio frequency band point in a range of the other reference variable capacitor.
4. The method according to any one of claims 1 to 3,
The range of regions of the reference variable capacitor,
Wherein the antenna is divided into regions having a predetermined size without being overlapped with each other.
4. The method according to any one of claims 1 to 3,
The range of regions of the reference variable capacitor,
Wherein the antenna is divided into regions of a predetermined size starting from an intermediate region of the coordinates to an end region of the coordinates without being overlapped with each other.
The method according to claim 1,
Wherein the antenna impedance adjusting unit comprises:
Antenna impedance detecting means electrically connected to the antenna impedance matching circuit for detecting mutual impedance values between the antenna impedances from the antenna impedance matching circuit;
An antenna which is electrically connected to the antenna impedance detecting means and calculates mutual impedance values between antenna impedances to be compensated by comparing mutual impedance values between the antenna impedances detected from the antenna impedance detecting means and mutual impedance values between the reference antenna impedances already stored, Impedance control means;
Digital-analog conversion means electrically connected to the antenna impedance control means and converting a digital signal corresponding to mutual impedance values between the antenna impedance to be compensated supplied from the antenna impedance control means into an analog signal; And
Analog converting means for receiving analog signals corresponding to mutual impedance values between the antenna impedances to be compensated which are electrically connected to the digital-analog converting means and converted by the digital-to-analog converting means, and receiving the analog signals corresponding to the mutual impedance values between the antenna impedances to be compensated, And antenna impedance adjusting means for matching the antenna impedance with each other by adjusting a voltage across the antenna impedance with at least one variable capacitor provided in the impedance matching circuit.
The method according to claim 1,
Wherein the antenna impedance adjustment unit includes a microcontroller unit (MCU).
The method according to claim 1,
Wherein the at least one variable capacitor comprises a first variable capacitor and a second variable capacitor electrically connected between the antenna impedances and connected in parallel with each other.
KR1020100109279A 2010-11-04 2010-11-04 System for optimizing matching of radio frequency in matching impedence of antenna KR101683909B1 (en)

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Application Number Priority Date Filing Date Title
KR1020100109279A KR101683909B1 (en) 2010-11-04 2010-11-04 System for optimizing matching of radio frequency in matching impedence of antenna
PCT/KR2011/008389 WO2012060665A2 (en) 2010-11-04 2011-11-04 Impedance matching device and system for optimizing matching of radio frequency in matching impedance of antenna

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Application Number Priority Date Filing Date Title
KR1020100109279A KR101683909B1 (en) 2010-11-04 2010-11-04 System for optimizing matching of radio frequency in matching impedence of antenna

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KR101683909B1 true KR101683909B1 (en) 2016-12-20

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JP6461779B2 (en) * 2015-12-21 2019-01-30 株式会社日立製作所 Plan adjustment system and plan adjustment method
CN110504977B (en) * 2019-08-22 2021-05-14 歌尔科技有限公司 Multi-frequency-band impedance matching circuit and wireless radio frequency system

Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2005064948A (en) 2003-08-14 2005-03-10 Matsushita Electric Ind Co Ltd Antenna matching device
US20050227633A1 (en) 2004-04-13 2005-10-13 Dunko Greg A Portable electronic devices including multi-mode matching circuits and methods of operating the same

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KR20060070803A (en) * 2004-12-21 2006-06-26 삼성전자주식회사 Antenna matching device and method for mobile communication terminal with built-in antenna
KR20080043067A (en) * 2006-11-13 2008-05-16 엘지이노텍 주식회사 Front end module of transmitter unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005064948A (en) 2003-08-14 2005-03-10 Matsushita Electric Ind Co Ltd Antenna matching device
US20050227633A1 (en) 2004-04-13 2005-10-13 Dunko Greg A Portable electronic devices including multi-mode matching circuits and methods of operating the same

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WO2012060665A2 (en) 2012-05-10
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