Dual-band planar quadrature hybrid with enhanced bandwidth response

Collado, C.; Grau, A.; Flaviis, F. De

doi:10.1109/tmtt.2005.860306

Cited by 64 publications

(41 citation statements)

References 14 publications

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“…Owing to the rapid development of wireless communications, microwave components that can operate at multiple frequency bands are playing a more important role in the wireless communications systems [1]. For example, wireless local area network (WLAN) systems work on multiple standards such as IEEE802.11b/g (2.4-2.5 GHz) and IEEE802.11a (5-5.9 GHz), so dual-band microwave components can provide compact solutions for these systems.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, some other approaches were reported to design for dual-band operation [4,5,6,7,8]. The 3-BLC proposed in [1] can provide dual-band operation with enhanced bandwidth. However, these proposed couplers suffer from relatively large size or narrow bandwidth which limits its application.…”

Section: Introductionmentioning

confidence: 99%

“…1(a) shows the schematic diagram of a conventional 3-BLC and this work is different from that of [1]. To simplify the formulation, we kept…”

Section: Introductionmentioning

confidence: 99%

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Miniaturized dual-band coupler using three-branch-line structure and dual transmission lines

Zhan

et al. 2017

IEICE Electron. Express

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This letter presents a compact dual-band branch-line coupler. Explicit design formulas of the three-branch-line coupler (3-BLC) are derived and useful design curves are given. The equivalent dual transmission lines structure is used to decrease the dimension, and also the partial branch lines are folded to further miniaturize the design. The proposed dual-band (2.45 and 5.8 GHz) coupler has a compact size with 57.6% size reduction compared with the conventional circuit. The measured and simulated results are in good agreement with each other. Keywords: dual-band coupler, compact size, three-branch-line structure, dual transmission lines Classification: Microwave and millimeter-wave devices, circuits, and modules References[1] C. Collado, et al.: "Dual-band planar quadrature hybrid with enhanced bandwidth response," IEEE Trans.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Miniaturized dual-band coupler using three-branch-line structure and dual transmission lines

Zhan

et al. 2017

IEICE Electron. Express

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“…Previously, some designs for dual-band branch-line couplers have been proposed [1][2][3][4]. By using four additional quarter wavelength branches, a dual-band microstrip line coupler has been achieved [1].…”

Section: Introductionmentioning

confidence: 99%

“…By using four additional quarter wavelength branches, a dual-band microstrip line coupler has been achieved [1]. By adding two additional cross branches [2] and an additional branch [3] to the conventional branch-line coupler, dual-band performance is obtained. The dual-band branch-line coupler can also be designed by adding four stubs to the conventional coupler [4].…”

Section: Introductionmentioning

confidence: 99%

Novel Compact Dual-Band Branch-Line Couplers With Half Elliptical-Ring Impedance Stub Lines

Han¹,

Jiao²,

Ni³

et al. 2015

PIER Letters

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Abstract-Novel compact dual-band branch-line couplers are presented. By using a half elliptical-ring impedance stub as a basic unit, dual-band branch-line couplers are obtained. Since a couple of half elliptical-ring impedance stubs can be folded inward to its enclosed area without overlap, the branch-line coupler can be miniaturized. In order to verify the effectiveness of the half elliptical-ring impedance stub, two different branch-line couplers operating at 2.4/5.8 GHz are designed, fabricated and tested. Measured results agree well with simulated ones. Compared with the stepped-impedance-stub branchline couplers, sizes of the proposed couplers are reduced by 43% and 30%, respectively.

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Microwave Metamaterial Circuits

Vendik

2014

Wiley Encyclopedia of Electrical and Electronics Engineering

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Electromagnetic metamaterials are usually defined as artificial effectively homogeneous structures with specific properties, that cannot be observed in natural materials. Different approaches are used for a description of the fundamental electromagnetic properties of metamaterials and the practical realization of these materials as well. Among them, the transmission line (TL) approach gives an efficient design tool for microwave applications. A conventional TL with the positive phase velocity behaves as a right‐handed transmission line (RH TL). An artificial RH TL is formed as a ladder network of capacitors connected in shunt and series inductors. The dual transmission line is designed as a ladder network of inductors connected in shunt and series capacitors. This line has the negative phase velocity and is referred to as the left‐handed transmission line (LH TL). A backward wave propagates along the LH TL, which can be considered as the one‐dimensional metamaterial. A more general model of an LH TL is the composite right/left handed (CRLH) structure. Many interesting features can be observed when a combination of RH TL and LH TL is used. The most important feature of the LH and RH TLs is that their dispersion characteristics are described by different equations. That can be used for many beneficial applications. Different combinations of LH and RH TLs are used for a design of miniature microwave devices with improved performance and enlarged functionality. Among them are microwave resonators and filters, microwave power divider/combiners, and microwave phase shifters. Multiband devices and tunable and reconfigurable microwave circuits are also under consideration.

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Dual-band planar quadrature hybrid with enhanced bandwidth response

Cited by 64 publications

References 14 publications

Miniaturized dual-band coupler using three-branch-line structure and dual transmission lines

Miniaturized dual-band coupler using three-branch-line structure and dual transmission lines

Novel Compact Dual-Band Branch-Line Couplers With Half Elliptical-Ring Impedance Stub Lines

Microwave Metamaterial Circuits

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