Novel Folding Technique for Planar Ferrite-Coupled-Line Circulators

Queck, Cham Kiong; Davis, L.E.

doi:10.1109/tmtt.2004.827000

Cited by 13 publications

(14 citation statements)

References 13 publications

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“…In order to obtain the nonreciprocal effects one needs to utilize the ferrite materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] or active elements such as amplifiers [19]. The integrated nonreciprocal devices are in general realized in microstrip [2][3][4][5][6][7][8][9][10][11][12] or slot line [15][16][17][18] technology, with the ferrite material magnetized longitudinally or transversely. Recently, the longitudinally magnetized microstrip [2][3][4][5][6][7][8][9][10][11] or slot [17,18] ferrite coupled lines (FCL) are being developed and employed to realize integrated nonreciprocal devices.…”

Section: Introductionmentioning

confidence: 99%

“…The integrated nonreciprocal devices are in general realized in microstrip [2][3][4][5][6][7][8][9][10][11][12] or slot line [15][16][17][18] technology, with the ferrite material magnetized longitudinally or transversely. Recently, the longitudinally magnetized microstrip [2][3][4][5][6][7][8][9][10][11] or slot [17,18] ferrite coupled lines (FCL) are being developed and employed to realize integrated nonreciprocal devices. Generally, the FCL section is a four port circuit build with a standard coupled lines (CL) composed of three conductors and with ferrite slab located above or below the lines.…”

Section: Introductionmentioning

confidence: 99%

“…However, in such structures high insertion losses associated with long ferrite slab (often several wavelengths) are being observed. Recent researches on these devices concern improvement of their parameters such as bandwidth and losses [3][4][5][6][7][8][9][10]17]. Taking into consideration the Faraday effect that appears in the structure, the optimal behavior of FCL section is obtained for ferrite interaction with linearly or circularly polarized waves [3,12].…”

Section: Introductionmentioning

confidence: 99%

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Study of Nonreciprocal Devices Using Three-Strip Ferrite Coupled Line

Marynowski¹,

Mazur²

2011

PIER

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Abstract-This paper presents the investigations of nonreciprocal devices employing a novel ferrite coupled line junction. The structure is designed using coplanar line technology with the ground half-planes reduced to the strips. The investigated junction is composed of one ferrite section placed in between of two dielectric sections. In the ferrite section the longitudinally magnetized ferrite slab is located at the top or the bottom of the strips and is covered with the dielectric layers. In the dielectric sections the ports of the junctions are located. The wave parameters and field distributions of the modes propagated in the dielectric and ferrite sections are obtained from spectral domain approach. In order to determine the scattering matrix of the junction the mode matching method is utilized. The investigation of the circulator and isolator designed based on the Smatrix of the junction are presented. The obtained results are verified by comparing them with HFSS simulations and own measurements of the fabricated devices. In both cases a very good agreement is observed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of Nonreciprocal Devices Using Three-Strip Ferrite Coupled Line

Marynowski¹,

Mazur²

2011

PIER

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“…Nonreciprocal devices have been extensively used in modern microwave and millimeter systems [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In order to obtain the nonreciprocal effects one needs to utilize the ferrite materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] or active elements such as amplifiers [16].…”

Section: Introductionmentioning

confidence: 99%

“…In order to obtain the nonreciprocal effects one needs to utilize the ferrite materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] or active elements such as amplifiers [16]. Recently, the longitudinally magnetized ferrite coupled strip- [2, 4-10, 15, 17, 18] or slotlines [14,19] are being developed and employed to realize integrated nonreciprocal devices.…”

Section: Introductionmentioning

confidence: 99%

Investigations of Cylindrical Ferrite Coupled Line Junction Using Hybrid Technique

Kusiek¹,

Marynowski²,

Mazur³

2011

PIER

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Abstract-In this paper, a novel longitudinally magnetized cylindrical ferrite coupled line (CFCL) junction is proposed. In comparison to planar ferrite coupled line (FCL) configurations, which are well known in literature, in such structure the higher gyromagnetic coupling occurs. This allows to obtain the required in FCL devices Faraday rotation angle π/4 for the ferrite with shorter length and lower value of magnetization. As a result the total insertion losses in the ferrite section can be reduced using the proposed topology. In the analysis of the proposed CFCL junction a hybrid technique combining method of moments and coupled mode method (MoM/CMM) is applied. The results are compared with the ones obtained from commercial software HFSS and a good agreement is obtained.

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Stripline Components

Barrio-Garrido¹,

Salazar‐Palma²,

Sarkar³

et al. 2005

Encyclopedia of RF and Microwave Engineering

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The fast spread of wireless and high‐speed communications brings the need for providing inexpensive and compact microwave circuits at very high frequencies. A promising approach is the development of the modern multilevel or three‐dimensional monolithic microwave integrated circuits (MMIC), printed circuit boards (PCB), and the new technologies for integration of millimeter‐wave systems like low‐temperature cofire ceramics (LTCC). In such environments, stripline‐like components play a key role and focus a great interest nowadays, because multilayer, embedded transmission line (ETL) based on stripline configurations originates from the three‐dimensional packages. Moreover, stripline is one of the preferred transmission lines in most of this environments because, among other advantages, radiation and dispersion are negligible and ground planes provide effective shielding. For example, in antenna feeding, stripline has probed to be a compact and effective solution. In filter applications, suspended striplines are extensively used by engineers because of their low unloaded Q‐factor. However, the multiconductor and multilayer structures present some complications derived from the shorting posts or via holes, spurious modes that result in crosstalk and losses, complex geometries, and so on. In many cases, it is necessary to find new design solutions to avoid parallel‐plate mode coupling, but full‐wave analysis becomes a complicated task. In this article, these issues are exposed, and both classic stripline components and new multilayer structures are presented. We discuss some design considerations, advantages and drawbacks, classic and new devices, and modern solutions recently reported for old and new necessities of the design and analysis of stripline configurations.

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Novel Folding Technique for Planar Ferrite-Coupled-Line Circulators

Cited by 13 publications

References 13 publications

Study of Nonreciprocal Devices Using Three-Strip Ferrite Coupled Line

Study of Nonreciprocal Devices Using Three-Strip Ferrite Coupled Line

Investigations of Cylindrical Ferrite Coupled Line Junction Using Hybrid Technique

Stripline Components

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