Miniaturized Fractal Rat-Race, Branch-Line, and Coupled-Line Hybrids

Ghali, Hani A.; Moselhy, Tarek

doi:10.1109/tmtt.2004.837154

Cited by 225 publications

(109 citation statements)

References 11 publications

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“…Many circuit miniaturization methods have been proposed to date, including methods using capacitor loading [5,[13][14][15], methods using a meander-like line [2][3][4]16], methods using stubs [17,18], a method using coupled lines [19], and a method using space-filling curves [20]. Hirota and colleagues have proposed a transmission line using a short high-impedance line and two lumped elements (capacitors) [5].…”

Section: Methods For Circuit Miniaturizationmentioning

confidence: 99%

“…Other reported configuration methods for the branchline hybrid circuits include that of Hirota in which the line length is shortened by loading two shunt capacitors into a high-impedance line [5], that using two loading shunt capacitors and a high-impedance line (with a meandering) in Ref. 2, that using meander-like lines proposed by Banba [3], a circuit using radial stubs [17], and a circuit using space-filling curves [20]. Table 1 shows a comparison of the intrinsic circuit areas of these circuits.…”

Section: Branch-line Hybrid Circuit Using Qd-tfms Linesmentioning

confidence: 99%

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Miniaturized branch‐line hybrid circuit using 3D MMIC quasi‐distributed TFMS lines

Tanaka¹,

Nishikawa²,

Aikawa³

2006

Electron Comm Jpn Pt II

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SUMMARYThis paper discusses a miniaturized branch-line hybrid circuit consisting of quasi-distributed TFMS lines, making use of the topological characteristics of the threedimensional MMIC. In the three-dimensional MMIC, it is possible to reduce the coupling between adjacent transmission lines due to their very fine structure. Hence, miniaturized meander-like lines can easily be realized. Further, due to the stacking effect in this technique, MIM (metal-insulator-metal) capacitors can easily be installed into the transmission line. In this paper, by utilizing these effects, a transmission line consisting of high-impedance TFMS lines and MIM capacitors is proposed. The TFMS line of this type is here called a QD-TFMS (Quasi-Distributed Thin Film MicroStrip) line. First, the characteristics of the QD-TFMS line are obtained by simulation and the size reduction effect is verified. Further, miniaturization of the branch-line hybrid circuit using the QD-TFMS lines is discussed. It is demonstrated that the fabricated circuit can be miniaturized to an area ratio of less than 20% in comparison with a branch-line hybrid circuit using only meander-like lines.

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Section: Methods For Circuit Miniaturizationmentioning

confidence: 99%

Section: Branch-line Hybrid Circuit Using Qd-tfms Linesmentioning

confidence: 99%

Miniaturized branch‐line hybrid circuit using 3D MMIC quasi‐distributed TFMS lines

Tanaka¹,

Nishikawa²,

Aikawa³

2006

Electron Comm Jpn Pt II

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“…Various branch line impedances are governed by the following equation [9]: ..... (2) Where, ε r is the dielectric constant of the substrate and "w" and "h" are the width of the microstrip and height of the substrate, respectively. Based upon above calculation balun has been designed at the centre frequency of 1.575GHz.…”

Section: Balun Designmentioning

confidence: 99%

“…Balun configurations are being used in various circuits such as balanced mixers, antenna, push pull amplifier, frequency multiplier and antenna feed networks [1][2][3][4][5]. Rapid development in digital wireless communication system demands wider bandwidth without compromising the size.…”

Section: Introductionmentioning

confidence: 99%

Broadband Branch Line Balun using Meander line on Silicon Substrate

Singh¹

2012

IOSRJECE

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“…In order to reach the requirements of telecommunication systems, various techniques and methods have been used to create different types of feeding networks such as sequential rotation and series-parallel feeding network and feeding networks based in CORPS, Butler matrix, etc. [1,[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In [2], a feeding network consists of seven quarter-wavelength transformers linked together in a sequential rotation manner with alternative parallel and series connection to form a frontport network.…”

Section: Introductionmentioning

confidence: 99%

A Novel Compact Feeding Network for Array Antenna

Mohammadi¹,

Piroutiniya²

2016

PIER Letters

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Abstract-A novel feeding network is investigated both theoretically and experimentally. The proposed system with combination of a Wilkinson power divider and two branch-Line couplers is established. The output signals of the system have the same amplitude and 90 • phase difference with each other. The size reduction technique is applied to minimize the physical size of the proposed network. In this technique, the ground of the structure is defected, and distributed capacitors and inductors are added to empty space of the branch-line couplers. Moreover, meandered lines are used in order to match the output impedance of the Wilkinson power divider arms and reduce its size. The initial design realized in 2.5 GHz shows the fractional bandwidth of 24%. Then a miniaturized structure is fabricated with 42% smaller size than the main structure while it shows similar electrical performance. For both cases, measurement and simulation results are in good agreement with each other.

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Miniaturized Fractal Rat-Race, Branch-Line, and Coupled-Line Hybrids

Cited by 225 publications

References 11 publications

Miniaturized branch‐line hybrid circuit using 3D MMIC quasi‐distributed TFMS lines

Miniaturized branch‐line hybrid circuit using 3D MMIC quasi‐distributed TFMS lines

Broadband Branch Line Balun using Meander line on Silicon Substrate

A Novel Compact Feeding Network for Array Antenna

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