@article {20_ANTENA_ARRAY_DUAL_SLOT_BOMBARDERO_KUMAR, title = {Dual-linearly polarized travelling-wave array antenna based on triple plus slots fed by square waveguide}, journal = {AEU - International Journal of Electronics and Communications}, volume = {119}, year = {2020}, pages = {153176}, abstract = {A dual-linearly polarized travelling-wave array antenna design at Ku-band composed by a novel single element named as triple plus slot is presented. It is formed by a plus slot with an additional pair of short auxiliary slots. The generation of the dual polarization is based on the two degenerated modes TE10 and TE01 supported by a square waveguide following a series feeding topology. Following the operation principle of the conventional plus slot, the transversal slot is only excited by the TE10 mode to generate vertical polarization while the longitudinal slot is only excited by the TE01 mode to generate horizontal polarization. The auxiliary slots provide new degrees of freedom to the antenna design process that allow to accomplish some strict requirements and overcome some design issues. Thus, the proposed triple plus slot has been experimentally validated in a dual-linearly polarized travelling-wave array configuration. The antenna has been fabricated and measured, providing some features such as high efficiency (>80\%), high gain (>13~dB) with a 1~dB-gain bandwidth higher than 10\%, grating lobe mitigation, high isolation between orthogonal polarizations (>25~dB) as well as a fractional impedance bandwidth (S11~<~-14~dB) higher than 11.7\% (from 16 to 18~GHz).}, keywords = {Antenna arrays, Dual-polarized antennas, Slot antennas}, issn = {1434-8411}, doi = {https://doi.org/10.1016/j.aeue.2020.153176}, url = {http://www.sciencedirect.com/science/article/pii/S1434841119332042}, author = {P Sanchez-Olivares and J L Masa-Campos and E Garcia-Marin and D Barrio-Tejedor and P Kumar} } @article {Lu2020, title = {Enhanced FEM-based DBIM approach for two-dimensional microwave imaging}, journal = {IEEE Transactions on Antennas and Propagation}, year = {2020}, note = {cited By 0}, doi = {10.1109/TAP.2020.3044806}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85098778567\&doi=10.1109\%2fTAP.2020.3044806\&partnerID=40\&md5=e274ac8195bb72d04eb8ea16b791dcce}, author = {Lu, P. and J C{\'o}rcoles and Kosmas, P.} } @conference {Lu2020, title = {Tools for the efficient implementation of the DBIM algorithm in microwave imaging experiments}, booktitle = {14th European Conference on Antennas and Propagation, EuCAP 2020}, year = {2020}, note = {cited By 0}, doi = {10.23919/EuCAP48036.2020.9136035}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85088651548\&doi=10.23919\%2fEuCAP48036.2020.9136035\&partnerID=40\&md5=f4e14a01da1594c70c35e7212df54a98}, author = {Lu, P. and J C{\'o}rcoles and Kosmas, P.} } @conference {19_EUCAP_PABLO_ANTENA_BOMBARDERO, title = {Dual Polarized Travelling-Wave Array Antenna Formed by Printed Cross Slots}, booktitle = {2019 13th European Conference on Antennas and Propagation (EuCAP)}, year = {2019}, month = {March}, pages = {1-5}, keywords = {Antenna arrays, Antenna measurements, Arrayed waveguide gratings, Couplings, dual linear polarization, dual polarization, dual polarized array antenna, dual polarized travelling-wave array antenna, electromagnetic wave polarisation, linear antenna arrays, linear orthogonal polarizations, longitudinal slots, microstrip antenna arrays, mutual coupling effects, printed cross slots, rectangular waveguides, slot antenna arrays, Slot antennas, square waveguide feeding, transversal slots}, issn = {null}, url = {https://ieeexplore.ieee.org/document/8740194}, author = {P Sanchez-Olivares and J L Masa-Campos and P Kumar and E Garcia-Marin} } @conference {C{\'o}rcoles2019358, title = {Finite element analysis of a wideband microwave tomography system for potential medical imaging}, booktitle = {2019 Joint International Symposium on Electromagnetic Compatibility, Sapporo and Asia-Pacific International Symposium on Electromagnetic Compatibility, EMC Sapporo/APEMC 2019}, year = {2019}, note = {cited By 0}, pages = {358-361}, doi = {10.23919/EMCTokyo.2019.8893660}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85075268036\&doi=10.23919\%2fEMCTokyo.2019.8893660\&partnerID=40\&md5=2bf34d4d7fb045f8f8b3aeca5e7ae5d8}, author = {J C{\'o}rcoles and Lu, P. and Kosmas, P.} } @conference {Lu20191949, title = {Non-linear Microwave Imaging Using Fast Iterative Shrinkage Thresholding}, booktitle = {Progress in Electromagnetics Research Symposium}, volume = {2019-June}, year = {2019}, note = {cited By 2}, pages = {1949-1956}, doi = {10.1109/PIERS-Spring46901.2019.9017793}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85081992157\&doi=10.1109\%2fPIERS-Spring46901.2019.9017793\&partnerID=40\&md5=8bedcba8b62c629a6b6d3bc498e9663d}, author = {Lu, P. and J C{\'o}rcoles and Kosmas, P.} } @article {corcoles2017estimation, title = {On the estimation of the worst-case implant-induced RF-heating in multi-channel MRI}, journal = {Physics in Medicine and Biology}, volume = {62}, number = {12}, year = {2017}, pages = {4711}, publisher = {IOP Publishing}, author = {J C{\'o}rcoles and Zastrow, Earl and Kuster, Niels} } @conference {Corcoles20171, title = {Optimization-based strategy in multiple-channel magnetic resonance systems operating at 128 MHz to reduce radiofrequency heating induced by active implantable medical devices}, booktitle = {2017 32nd General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2017}, volume = {2017-January}, year = {2017}, note = {cited By 2}, pages = {1-3}, doi = {10.23919/URSIGASS.2017.8105232}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85046140205\&doi=10.23919\%2fURSIGASS.2017.8105232\&partnerID=40\&md5=2f1a69d9a5ebcca222c42b8feaf694eb}, author = {J C{\'o}rcoles and Zastrow, E. and Kuster, N.} } @article {murbach2017pregnant, title = {Pregnant women models analyzed for RF exposure and temperature increase in 3T RF shimmed birdcages}, journal = {Magnetic resonance in medicine}, volume = {77}, number = {5}, year = {2017}, pages = {2048{\textendash}2056}, author = {Murbach, Manuel and Neufeld, Esra and Samaras, Theodoros and J C{\'o}rcoles and Robb, Fraser J and Kainz, Wolfgang and Kuster, Niels} } @article {16_AE_JL_PRADEEP_DUAL_UWB, title = {Dual Polarized Monopole Patch Antennas for UWB Applications with Elimination of WLAN Signals}, journal = {Advanced Electromagnetic}, volume = {5}, year = {2016}, pages = {46-52}, abstract = {This paper presents the design, fabrication and measurement of dual polarized microstrip patch antennas for ultra wideband (UWB) applications with notch at 5-6 GHz band. The proposed antenna rejects the wireless local area network (WLAN) signals and work properly in the entire remaining ultra-wideband. Two antennas are designed for two different frequency bands of ultra wideband and both antennas together produce the entire ultra wideband with notch at 5-6 GHz band. The antennas are fed by a 50 {\textohm} coaxial probe and the entire design is optimized using CST Microwave Studio. The bandwidth of 3.1-5 GHz is achieved by the optimized design of Antenna-1 and the bandwidth of 6 -10.6 GHz is achieved by the optimized design of Antenna-2. The bandwidth of the optimized combined antenna is 3.1-10.6 GHz with elimination of the 5-6 GHz band. Both antennas are simulated, developed and measured. The simulated and measured results are presented. The two designed dual polarized antennas i.e. Antenna-1 and Antenna-2 can be used for 3.1-5 GHz band and 6-10.6 GHz band dual polarized applications, respectively, and the combined antenna structure can be used for UWB dual polarized applications with elimination of 5-6 GHz band signals.}, keywords = {Antennas, UWB, WLAN}, issn = {2119-0275}, doi = {10.7716/aem.v5i1.305}, url = {http://www.aemjournal.org/index.php/AEM/article/view/305}, author = {P Kumar and J L Masa-Campos} } @article {murbach2016virtual, title = {Virtual population-based assessment of the impact of 3 Tesla radiofrequency shimming and thermoregulation on safety and B1+ uniformity}, journal = {Magnetic resonance in medicine}, volume = {76}, number = {3}, year = {2016}, pages = {986{\textendash}997}, author = {Murbach, Manuel and Neufeld, Esra and Cabot, Eugenia and Zastrow, Earl and J C{\'o}rcoles and Kainz, Wolfgang and Kuster, Niels} } @article {15_PMB_ConvexImplant, title = {Convex optimization of MRI exposure for mitigation of RF-heating from active medical implants}, journal = {Physics in Medicine and Biology}, volume = {60}, number = {18}, year = {2015}, pages = {7293}, abstract = {Local RF-heating of elongated medical implants during magnetic resonance imaging (MRI) may pose a significant health risk to patients. The actual patient risk depends on various parameters including RF magnetic field strength and frequency, MR coil design, patient{\textquoteright}s anatomy, posture, and imaging position, implant location, RF coupling efficiency of the implant, and the bio-physiological responses associated with the induced local heating. We present three constrained convex optimization strategies that incorporate the implant{\textquoteright}s RF-heating characteristics, for the reduction of local heating of medical implants during MRI. The study emphasizes the complementary performances of the different formulations. The analysis demonstrates that RF-induced heating of elongated metallic medical implants can be carefully controlled and balanced against MRI quality. A reduction of heating of up to 25 dB can be achieved at the cost of reduced uniformity in the magnitude of the $\#$$\#$IMG$\#$$\#$ [http://ej.iop.org/images/0031-9155/60/18/7293/pmb516939ieqn001.gif] {$B_{1}^{+} $} field of less than 5\%. The current formulations incorporate a priori knowledge of clinically-specific parameters, which is assumed to be available. Before these techniques can be applied practically in the broader clinical context, further investigations are needed to determine whether reduced access to a priori knowledge regarding, e.g. the patient{\textquoteright}s anatomy, implant routing, RF-transmitter, and RF-implant coupling, can be accepted within reasonable levels of uncertainty.}, url = {http://stacks.iop.org/0031-9155/60/i=18/a=7293}, author = {J C{\'o}rcoles and E Zastrow and N. Kuster} } @conference {15_BMES_Murbach_3Tpregnant, title = {Influence of 3T pTx body coils and their excitations on a pregnant anatomical models}, booktitle = {Biomedical Engineering Society and Food and Drug Administration Frontiers in Medical Devices Conference: Innovations in Modeling and Simulation, (2015 BMES/FDA Frontiers)}, year = {2015}, month = {May}, author = {M Murbach and E Neufeld and J C{\'o}rcoles and E Zastrow and N. Kuster} } @conference {15_ISMRM_Murbach_3Tpregnant, title = {Pregnant Anatomical Models in 3T pTx Body Coils: Evaluation of SAR and B1+ Optimization in Various Imaging Positions}, booktitle = {23rd Annual Meeting of the International Society for Magnetic Resonance in Medicine, 2015. ISMRM 2015}, year = {2015}, month = {June}, author = {M Murbach and E Neufeld and E Cabot and E Zastrow and J C{\'o}rcoles and W Kainz and N. Kuster} } @conference {15_IEEEAPS_ImplantSOCP, title = {RF shimming with implant safety control in MRI transmit arrays through second-order cone programming}, booktitle = {IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, AP-S/URSI 2015}, year = {2015}, month = {July}, author = {J C{\'o}rcoles and E Zastrow and N. Kuster} } @article {47_PARCHE_GUIA_RECTANGULAR_ MOTL_PRADEEP, title = {Waveguide Fed Circular Microstrip Patch Antenna for Ku Band Applications}, journal = {Microwave and Optical Technology Letters}, volume = {57}, number = {3}, year = {2015}, pages = {585-589}, abstract = {This paper presents the design and development of a waveguide fed microstrip patch antenna for Ku band applications. A circular patch is fed by using a conventional WR-51 rectangular waveguide ended with a feeding slot capacitively coupled to the radiating patch. The design is optimized using the electromagnetic software CST Microwave Studio. The antenna is fabricated and the measured results are compared with simulations. The achieved bandwidth of the manufactured antenna is approximately 16.2 - 18.4 GHz, and a maximum gain of 5.7 dBi. The comparison of measured and simulated results shows good agreement except in the prediction of the surface wave effects propagated in the antenna substrate.}, keywords = {circular patch, Ku band, rectangular waveguide, slotted ground plane}, issn = {0895-2477}, doi = {10.1002/mop.28904}, url = {http://onlinelibrary.wiley.com/doi/10.1002/mop.28904/full}, author = {P Kumar and J L Masa-Campos} } @article {26_UWB_Pradeep_MOTL, title = {Dual polarized microstrip patch antennas for ultra-wideband applications}, journal = {Microwave and Optical Technology Letters}, volume = {56}, number = {9}, year = {2014}, month = {Sep.}, pages = {2174 - 2179}, abstract = {This article presents a novel design of dual polarized microstrip patch antennas for ultra-wideband (UWB) applications. Two antennas are designed for different frequency band of UWB. Both antennas are loaded together and the combined antenna is designed for the entire UWB. The designed antenna is optimized using CST Microwave Studio simulator. The antennas are fed by a 50-? coaxial probe. Both antennas are fabricated and measurement of return loss and radiation pattern is performed. The VSWR 2:1 bandwidth of individual designed Antenna I and Antenna II is 3.1{\textendash}5.2 GHz and 4.9{\textendash}11.5 GHz, respectively. The comparison between simulated results and measured results shows good agreement}, keywords = {dual polarization, microstrip antenna, reflection coefficient, ultra wideband}, issn = {0895-2477}, doi = {10.1002/mop.28504}, url = {http://onlinelibrary.wiley.com/doi/10.1002/mop.28504/pdf}, author = {P Kumar and J L Masa-Campos} } @article {8_ParallelplateIEEE, title = {Parallel Plate Patch Antenna With Internal Rectangular Coupling Patches and TEN0 Mode Excitation}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {57}, number = {7}, year = {2009}, month = {Jul.}, pages = {2185-2189}, abstract = {A parallel plate waveguide antenna is presented with microstrip patches as radiating elements. Rectangular patches are also placed inside the waveguide as coupling field structures from the waveguide to the radiating elements. The connections from the coupling to the radiating patches are made by means of vias. The field propagated along the parallel plate waveguide corresponds to a high order TE mode, creating virtual smaller rectangular waveguides in the parallel plate structure. An antenna prototype has been manufactured and measured. A 60\% efficiency and 27 dBi antenna gain were obtained; with a 6.5\% reflection bandwidth. Nevertheless, the resonant behaviour becomes evident in the radiation pattern measurements.}, keywords = {Microstrip coupling horizontal lines, parallel plate waveguide, patch antenna, virtual waveguide}, issn = {0018-926X}, doi = {10.1109/TAP.2009.2021969}, url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=4907131}, author = {J L Masa-Campos and Klinger, S and Sierra-P{\'e}rez, M} }