A New Planar Artificial Transmission Line and Its Applications to a Miniaturized Butler Matrix

Wang, Chaowei; Ma, Tzyh‐Ghuang; Yang, Chang‐Fa

doi:10.1109/tmtt.2007.909474

Cited by 193 publications

(101 citation statements)

References 17 publications

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“…In the next step, the size of the structure is decreased. There are several methods to minimize the coupler's size such as π-equivalent model [5,6], T-shaped structure [7], dual TLs [8], quasi-lumped elements [9,10], and fractal structure [11]. Defected Ground Structure (DGS) [12] and loading the transmission lines of couplers with inductance (L) and capacitance are used to reduce the size of the system.…”

Section: Design Proceduresmentioning

confidence: 99%

“…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%

See 1 more Smart Citation

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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Section: Design Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Compact Feeding Network for Array Antenna

Mohammadi¹,

Piroutiniya²

2016

PIER Letters

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“…It is well know that an artificial structure, consisting for example of metallic inclusions in a dielectric host material [25,26] or of a periodically loaded transmission line [27][28][29][30][31][32][33][34][35], can be considered as an homogenous medium at frequencies corresponding to wavelengths much longer than the intrinsic length-scales of the composite (effective medium approach) [25,26,[36][37][38][39][40].…”

Section: Metal Foams Analytical Model: An Effective Medium Approachmentioning

confidence: 99%

Metal Foams for Electromagnetics: Experimental, Numerical and Analytical Characterization

Catarinucci¹,

Monti²,

Tarricone³

2012

PIER B

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Abstract-This work focuses on the use of metal foams, a relatively new class of materials, for high added-value electromagnetic (EM) shields. First, the Shielding Effectiveness (SE) of aluminum foam slabs is experimentally evaluated, showing very good shielding properties. Successively, accurate numerical models of metal foams are proposed and used in a proprietary Variable-Mesh Parallel Finite Difference Time Domain code, in order to characterize the EM properties of slabs of such materials. Afterwards, a third approach is adopted. It consists in the application of the effective medium theories in order to obtain an analytical EM model of the metal foams; this way, their SE can be evaluated with a negligible computational time by using common mathematical tools. Finally, a methodology to design/analyze customized metal foams for EM shield applications is suggested. It takes advantage from the joint use of the numerical and analytical presented approaches, thus allowing a computationally efficient evaluation of SE and other electromagnetic properties of metal foams. Results demonstrate the suitability of metal foam structures for effective EM shielding in many industrial applications, as well as the accuracy of the proposed analytical and numerical approaches.

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“…Recently, a novel planar artificial transmission line was proposed [8,9]. It is composed of microstrip quasi-lumped elements and their discontinuities with single-layer printed circuit board.…”

Section: The Planar Artificial Transmission Linementioning

confidence: 99%

A Compact Dual-Band Power Divider Using Planar Artificial Transmission Lines for GSM/DCS Applications

Yang¹,

Liu²,

Yan³

2009

PIER Letters

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Abstract-A compact dual-band power divider for GSM/DCS applications is proposed in this letter.Novel planar artificial transmission lines are applied to miniaturize the power divider and achieve wideband response. The proposed dual-band power divider is about 37% of conventional one. The design principle, simulated and measured results are all discussed. The measured results show that good performance can be achieved at the operation frequencies.

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A New Planar Artificial Transmission Line and Its Applications to a Miniaturized Butler Matrix

Cited by 193 publications

References 17 publications

A Novel Compact Feeding Network for Array Antenna

A Novel Compact Feeding Network for Array Antenna

Metal Foams for Electromagnetics: Experimental, Numerical and Analytical Characterization

A Compact Dual-Band Power Divider Using Planar Artificial Transmission Lines for GSM/DCS Applications

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