Parasitic Element Based Decoupling Network for a Two-Element MRI Phased Array

Salama, Sanaa; Abuelhaija, Ashraf

doi:10.1109/jeeit.2019.8717525

Cited by 3 publications

(5 citation statements)

References 7 publications

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“…In this case, the insertion of a transmission line (170 mm  5 mm) with an open circuited end has been used as a parasitic-element between the two rectangular elements. This case was analyzed and considered previously in details by [10], where a loss of -22.669 dB and an isolation level of 18.5311 dB at resonant frequency were obtained as shown in Fig. (6) The current and magnetic field are shown in Fig.…”

Section: Open Circuit Parasitic Based Decoupling Circuitmentioning

confidence: 99%

“…Putting in (10) and rearranging, the voltages V1 and V3 are related with the currents I1 and I3 as given in ( 6):…”

Section: Short Circuited Parasitic-element Based Dnmentioning

confidence: 99%

“…This technique gave good decoupling greater than 23dB over a frequency span [297.931 MHz to 298.23 MHz] and the return loss was (-31.461) dB at frequency of 298.08 MHz. In [10], the idea of parasitic element is applied to achieve high isolation between the RF coil elements. Reference [7] suggested the use of an open circuited parasiticelement.…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive Study on Decoupling Networks for 7 Tesla MRI based on Reactive Load Parasitic-Element

Salama

Abuelhaija

Baldawi

et al. 2020

mjee

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This work presents and evaluates the integrating of decoupling networks in MRI systems at 7 Tesla magnetic field strength. The parasitic element is reactive loaded. Four different cases of reactive loads are considered: capacitive load, inductive load, open circuited, and short-circuited loads are considered. The idea behind this technique is to reduce or even eliminate the effect of mutual coupling between the RF coil elements in magnetic resonance imaging (MRI)system. Two rectangular loops are used to compose a planar phased array. This structure is designed and optimized in CST at the Larmor frequency of 298.3 MHz corresponding to the 7 Tesla MRI system.

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Section: Open Circuit Parasitic Based Decoupling Circuitmentioning

confidence: 99%

“…Putting in (10) and rearranging, the voltages V1 and V3 are related with the currents I1 and I3 as given in ( 6):…”

Section: Short Circuited Parasitic-element Based Dnmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comprehensive Study on Decoupling Networks for 7 Tesla MRI based on Reactive Load Parasitic-Element

Salama

Abuelhaija

Baldawi

et al. 2020

mjee

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“…The topic of designing multiports for antenna arrays, which provide decoupled and matched ports for the amplifiers (either high power amplifiers (HPA) for transmission or low noise amplifiers (LNAs) for reception), has been treated in the literature by several authors [6]- [7], [8], [9]- [10], [11]- [12]. Some of them are using lumped elements, some are using strip lines, and some use the so-called parasitic antenna.…”

Section: Introductionmentioning

confidence: 99%

Decoupling and Matching Strategies for Compact Antenna Arrays

Pereira

Nossek

Cavalcanti

2020

JCIS

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Since the MIMO technology presents antenna arrays that can be formatted with tens to hundreds antenna elements, several effects arise due to this array structure, such as mutual coupling and impedance matching among antenna elements in the array. The treatment of these issues seeks to solve problems such as the performance degradation of communication systems. In this context, this paper proposes and evaluates three strategies of joint decoupling and impedance matching networks (DMN) for antenna arrays. The first method, called DMN with Lumped Elements (DMN-LE), performs the decoupling and impedance matching steps with capacitors and inductors. The second method, called DMN with Ring Hybrid (DMN-RH), utilizes a microstrip line in a ring format. The third method, called Networkless Decoupling and Matching (NDM), brings a concept of decoupling without the presence of a network itself, which enables modeling an antenna array that performs DMN operations in a simplified and compact manner. A comparison of the methods is performed both analytically and via computer simulations. The figure-of-merit for this comparison is the antenna bandwidth, for which both matching and decoupling are measured against S-parameters below a given threshold. We conclude that the third method is a promising new alternative approach.

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“…Reactive decoupling networks have been developed to be inserted between the adjacent coil * Correspondence: ashrafabuelhaija@googlemail.com elements in order to compensate for mutual coupling [20][21][22]. A parasitic element-based decoupling method has been demonstrated as a successful decoupling technique for microstrip transmission line array elements [23], monopole elements [24], and phased array [25]. Another technique that has played an intrinsic role in transmit array decoupling is an ultralow output impedance RF power amplifier [26].…”

Section: Introductionmentioning

confidence: 99%

Decoupling network for Tx/Rx body coil for 7T MRI

Abuelhaija¹,

Salamh²,

Nashwan³

2019

Turk J Elec Eng & Comp Sci

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The parallel imaging technique is widely used in 7T MRI scanners. It employs multichannel RF coil arrays to apply a concurrent excitation and acquisition method. Concurrent excitation faces significant challenges in terms of electromagnetic coupling between the RF coil elements. In order to prevent interference between the RF coil elements' exciters, several decoupling methods have been developed to compensate for coupling and to permit independent work for the exciters. This paper studies the coupling between meander coils arranged in two different geometrical setups and investigates the isolation performance between the coils by applying two different decoupling networks depending on the geometrical setup of the coils. These two decoupling networks in addition to a T-shaped decoupling network have been integrated into a Tx/Rx body coil for 7 T to compensate for mutual coupling between array coil elements. The results have been obtained by using CST Microwave Studio (CST AG, Darmstadt, Germany).

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Parasitic Element Based Decoupling Network for a Two-Element MRI Phased Array

Cited by 3 publications

References 7 publications

Comprehensive Study on Decoupling Networks for 7 Tesla MRI based on Reactive Load Parasitic-Element

Comprehensive Study on Decoupling Networks for 7 Tesla MRI based on Reactive Load Parasitic-Element

Decoupling and Matching Strategies for Compact Antenna Arrays

Decoupling network for Tx/Rx body coil for 7T MRI

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