Source: http://www.google.com/patents/US7471167?dq=6978253
Timestamp: 2015-03-27 17:28:11
Document Index: 115832726

Matched Legal Cases: ['arts 141', 'art 140', 'arts 143', 'art 145', 'art 140', 'art 143', 'art 145', 'art 140', 'art 143', 'art 145', 'art 140', 'art 140', 'art 140', 'art 140', 'art 140', 'art 140', 'arts 140', 'art 140', 'art 140', 'arts 140', 'art 140', 'arts 140', 'arts 141', 'arts 143', 'art 141', 'art 143', 'art 145', 'art 140', 'art 143', 'art 145', 'art 140', 'art 140', 'art 140', 'art 140', 'art 140']

Patent US7471167 - Balun - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA balun capable of a reduced whole size. The balun includes an input line receiving an unbalanced signal, an output line receiving the unbalanced signal from the input line and outputting a balanced signal, and a ground part. The input and output lines are formed on a layer, and the ground part is formed...http://www.google.com/patents/US7471167?utm_source=gb-gplus-sharePatent US7471167 - BalunAdvanced Patent SearchPublication numberUS7471167 B2Publication typeGrantApplication numberUS 11/638,507Publication dateDec 30, 2008Filing dateDec 14, 2006Priority dateFeb 17, 2006Fee statusPaidAlso published asCN100568621C, CN101026256A, US20070194860Publication number11638507, 638507, US 7471167 B2, US 7471167B2, US-B2-7471167, US7471167 B2, US7471167B2InventorsChul-Soo Kim, Dal Ahn, Kwi-soo Kim, In-Sang Song, Yun-Kwon Park, Seok-chul Yun, Kuang-woo NamOriginal AssigneeSamsung Electronics Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (6), Referenced by (7), Classifications (7), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetBalun
US 7471167 B2Abstract
A balun capable of a reduced whole size. The balun includes an input line receiving an unbalanced signal, an output line receiving the unbalanced signal from the input line and outputting a balanced signal, and a ground part. The input and output lines are formed on a layer, and the ground part is formed on a different layer from the layer. The ground part includes an opening and is electrically connected to the input line, and a portion of the ground part is removed to form the opening so that a potential difference occurs between first and second output lines. Thus, although a length of the output line is less than � of an input wavelength λ, a difference between phases of first and second output signals can be about 180�. As a result, the whole size of the balun can be reduced.
12. The balun of claim 1, wherein a difference between phases of the first and second output signals is about 180�.
a capacitor provided above the ground part and comprising third and fourth electrode parts, wherein the third electrode part is spaced apart from the third metal part, and the fourth electrode part extends from the third electrode part and is connected to the second metal part to electrically connect the second metal port to the third electrode part. Description
The first and second output lines 30 and 40 are spaced apart from each other and face each other based on a central line crossing the base substrate 10. The first and second output lines 30 and 40 are patterned into a substantially configuration.
As described above, an input signal is divided into two half signals, the two half signals are output as first and second output signals, and a difference between phases of the first and second output signals is about 180�. For this purpose, a length of a portion of the input line 70 positioned above the first output line 30 must be about � of an input wavelength λ, and a length of a portion of the input line 70 positioned above the second output line 40 must also be about � of the input wavelength λ. Also, lengths of the first and second output lines 30 and 40 facing the input line 70 must each be about � of the input wavelength λ.
As described above, the lengths of the first and second output lines 30 and 40 facing the input line 70 must each be about � of the input wavelength λ so that the balun 90 receives the unbalanced signal and outputs the balance signal through the first and second output ports OP1 and OP2. As a result, there is a limitation to reducing a whole size of the balun 90.
A difference between phases of the first and second output signals may be about 180�.
In a balun according to the present invention, a ground part may be patterned so that a potential difference occurs between first and second output signals. Although a length of an output line is less than � of an input wavelength λ, a difference between phases of the first and second output signals can be about 180�. As a result, a whole size of the balun can be reduced.
A process of outputting the first and second output signals will now be described. The input signal input from the first port P1 is transmitted along the input line 120 and output through the second port P2. The input signal output from the second port P2 is input to the input port P3 through a space formed between the second port P2 and the input port P3 of the output line 130. Here, a difference between phases of the first and second output signals is about 180�. Thus, the first and second output lines 131 and 133 divide the input signal received from the input port P3 into two half signals to output the first and second output signals.
In the present embodiment, the second pattern OP has an �I� shape but may have one of various shapes such as a dumbbell shape or a spiral shape according to the shapes of the first, second, and third metal parts 141, 143, and 145.
As described above, in the balun 100 according to the present embodiment, the input and output lines 120 and 130 are provided on the same layer. Also, the ground part 140 formed above the input and output lines 120 and 130 is patterned in a predetermined shape so that a potential difference occurs between the first and second output lines 131 and 133. Thus, the output line 130 outputs the first and second output signals through the first and second ports P4 and P5, respectively, so that the difference between the phases of the first and second output signals is about 180�. As a result, although lengths of the first and second output lines 131 and 133 are each shorter than � of the input wavelength λ, the first and second output lines 131 and 133 may output the first and second output signals into which the input signal is equally divided. Therefore, a whole size of the balun 100 can be reduced.
FIG. 7 is a graphical representation of phases of output signals respectively output from the first and second output ports P4 and P5 shown in FIG. 4, and FIG. 8 is a graphical representation of magnitudes of the output signals respectively output from the first and second output ports P4 and P5 shown in FIG. 4 Referring to FIGS. 4, 7, and 8, a first output signal S41 is input from the first port P1 and output through the first output port P4, and a second output signal S51 is input from the first port P1 and output through the second output port P5.
When a frequency is about 2 GHz, a phase of the first output signal S41 is about 0�, a phase of the second output signal S51 is about 180�, and magnitudes of the first and second output signals S41 and S51 are each about −3 dB. In other words, a difference between the phases of the first and second output signals S41 and S51 is about 180�, half of the input signal is output as the first output signal S41, and the other half of the input signal is output as the second output signal S51.
Encircled area �D� of FIG. 15 is substantially identical to encircled area �A� of FIG. 3. Referring to FIGS. 6 and 15 which show area �A� in enlargement, the second port P2 and the input port P3 are partly exposed through a space between the second and the third metal parts 143, 145. An end of the third metal part 145 is electrically connected with the second port P2 via the first conductor 160, and accordingly, the ground part 140 is electrically connected with the input line 120. However, because the second metal part 143 and the third metal part 145 are spaced away from each other, all the input signal is not induced to the ground part 140. The distance between the second metal part 143 and the third metal part 145 determines the capacitance of the balun 400.
The ground part 140 may include a first ground part 140 a, a second ground part 140 b and a fourth conductor 140 c. The first ground part 140 a is electrically connected with the input line 120 via the first conductor 160. The second ground part 140 b is formed on the first ground part 140 a at a predetermined distance. The fourth conductor 140 c electrically connects the first and the second ground parts 140 a, 140 b, and at the same time, supports one end of the second ground part 140 b whose other end extends over the first ground part 140 a. The first and the second ground parts 140 a, 140 b have substantially the same configuration as the ground part 140 exemplified in FIG. 15. Accordingly, the first and the second ground parts 140 a, 140 b include a first pattern having first to third metal parts 141, 143, 145, and a second pattern OP defined by the first pattern, in which the second and the third metal parts 143, 145 include branches 143 a, 143 b, 143 c, 143 d, 143 e and 145 a, 145 b, 145 c, 145 d, 145 e extending from the first metal part 141 toward the center of the base substrate 110.
Referring to FIG. 17, the second to fourth branches 143 b, 143 c, 143 d of the second metal part 143, and the second to fourth branches 145 b, 145 c, 145 d of the third metal part 145 may be formed on the first ground part 140 a, and the first and the fifth branches 143 a, 143 e of the second metal part 143, and the first and the fifth branches 145 a, 145 e of the third metal part 145 may be formed on the second ground part 140 b. If the ground part 140 is structured according to the above, the second pattern OP of the ground part 140 may have substantially the same size as the second pattern of the ground part 140 of FIG. 15. Accordingly, the size of the second pattern OP increases by the use of a plurality of the ground part 140 of the balun 100 of FIG. 3, and the inductance of the balun 500 increases.
As described above, in a balun according to an exemplary embodiment of the present invention, input and output lines can be formed on the same layer, and a ground part having a second pattern in the form of an opening can be formed above the input and output lines. The first pattern of the ground part can include a second metal part positioned above the first output line and a third metal line positioned above the second output line. The third metal part can be electrically connected to the input line and spaced apart from the second metal part. Thus, a potential difference can occur between the second and third metal parts. Although first and second output lines each have a length shorter than � of an input wavelength λ, a difference between phases of first and second output signals can be about 180�. As a result, a whole size of the balun can be reduced.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3976959 *Jul 21, 1975Aug 24, 1976Gaspari Russell APlanar balunUS4240052 *Oct 12, 1979Dec 16, 1980Rockwell International CorporationBalun filter apparatusUS4755775 *Dec 4, 1984Jul 5, 1988Polska Akademia Nauk Centrum Badan KosmicznychMicrowave balun for mixers and modulatorsUS5304959 *Oct 16, 1992Apr 19, 1994Spectrian, Inc.Planar microstrip balunUS5594393 *Apr 17, 1995Jan 14, 1997Ant Nachrichtentechnik GmbhMicrowave line structureUSH1959 *Sep 3, 1998May 1, 2001Anthony KikelSingle balanced to dual unbalanced transformer* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS8154360 *May 6, 2011Apr 10, 2012Fujikura Ltd.Resin multilayer device and method for manufacturing sameUS8207797 *Jan 29, 2010Jun 26, 2012National Taiwan UniversityBalunUS8354892 *Jul 8, 2010Jan 15, 2013Electronics And Telecommunications Research InstituteMarchand balun device for forming parallel and vertical capacitanceUS8471645 *Dec 6, 2012Jun 25, 2013Panasonic CorporationBalanced-unbalanced transformerUS20110001574 *Jan 29, 2010Jan 6, 2011National Taiwan UniversityBalunUS20110102096 *Jul 8, 2010May 5, 2011Electronics And Telecommunications Research InstituteMarchand balun device for forming parallel and vertical capacitanceUS20110210804 *May 6, 2011Sep 1, 2011Fujikura Ltd.Resin multilayer device and method for manufacturing same* Cited by examinerClassifications U.S. Classification333/26, 333/238International ClassificationH03H7/42, H01P3/08, H01P5/10Cooperative ClassificationH01P5/10European ClassificationH01P5/10Legal EventsDateCodeEventDescriptionMay 16, 2012FPAYFee paymentYear of fee payment: 4Dec 14, 2006ASAssignmentOwner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, REPUBLIC OFFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, CHUL-SOO;AHN, DAL;KIM, KWI-SOO;AND OTHERS;REEL/FRAME:018871/0699Effective date: 20061208RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services