@article {20_TAP_PABLO_ESCALONA_SLOT_CONFORMAL_CIRCULAR_WAVEGUIDE,
	title = {High-Gain Conical-Beam Traveling-Wave Array Antenna Based on a Slotted Circular Waveguide at $Ku$ -Band},
	journal = {IEEE Transactions on Antennas and Propagation},
	volume = {68},
	number = {8},
	year = {2020},
	month = {Aug},
	pages = {6435-6440},
	abstract = {A high-gain conical-beam traveling-wave array antenna based on a slotted circular waveguide is designed at the higher part of Ku-band. A single radiating element is formed by a ring of eight equally spaced slots fed by a circular waveguide. The excitation of the nonfundamental TM01 mode provides a uniform feeding distribution to each slot, generating an omnidirectional radiation performance. Thus, an array antenna formed by 48 rings of slots is proposed following the design rules of traveling-wave arrays. Every ring is properly designed to achieve a uniform power distribution and consequently maximum directivity for the array antenna performance. The distance between elements is also adjusted to obtain the better input matching response and mitigate the grating lobe appearance, generating a high-gain conical-beam radiation performance suitable for satellite and fifth-generation communications. The proposed antenna design has been manufactured in plastic material by using a 3-D printing process and plated by a spray metallization process. A -10 dB impedance bandwidth higher than 23\%, high-gain values around 13.5 dB, or total efficiency higher than 98\% has been achieved for the whole frequency band.},
	keywords = {Antenna arrays, antenna radiation patterns, circular waveguides, Couplings, Dipole antennas, omnidirectional antennas, Slot antennas},
	issn = {1558-2221},
	doi = {10.1109/TAP.2020.2970031},
	author = {P Sanchez-Olivares and J L Masa-Campos and E Garcia-Marin and D Escalona-Moreno}
}
@article {20_IEEE ACCESS_LUCAS POLO_ARRAY DESFASADORES TORNILLOS,
	title = {Mechanically Reconfigurable Linear Phased Array Antenna Based on Single-Block Waveguide Reflective Phase Shifters With Tuning Screws},
	journal = {IEEE Access},
	volume = {8},
	year = {2020},
	pages = {113487-113497},
	abstract = {This work presents the design and prototyping of a reconfigurable phased array in Ku band (16 to 18 GHz) implemented in waveguide technology. The design is based on the use of a novel seamless waveguide module integrating four reconfigurable phase shifters to adjust the relative phase shift between the unitary elements of a linear array, which are illuminated uniformly by a corporate waveguide feeding network. The phase shifters are implemented by a 90{\textdegree} hybrid coupler in waveguide technology where two of its ports are loaded with a tunable reactive load, implemented in this proof of concept with a tuning screw. The four phase shifters have been manufactured in a single part using direct metal laser sintering, avoiding the losses related to bad electric contacts and misalignments associated to multipart devices. This also simplifies the assembly of the full phased array, leading to a modular approach with three parts whose design can be addressed separately. The experimental results for the complete array antenna show great performance and demonstrate that the main-lobe of the radiation pattern can be effectively scanned continuously between the angles -25{\textdegree} and 25{\textdegree}, with a high efficiency in the whole design band thanks to the proposed waveguide implementation.},
	keywords = {antenna radiation patterns, Beam steering, Couplers, Fasteners, linear antenna arrays, phase shifters, Phased arrays},
	issn = {2169-3536},
	doi = {10.1109/ACCESS.2020.3003193},
	author = {L Polo-Lopez and J L Masa-Campos and A T Muriel-Barrado and P Sanchez-Olivares and E Garcia-Marin and J C{\'o}rcoles and J A Ruiz-Cruz}
}
@article {19_ANT_MAG_PABLO_PAULA_CONFORMADA_DIODOSPIN_3_5GHZ,
	title = {Circular Conformal Array Antenna With Omnidirectional and Beamsteering Capabilities for 5G Communications in the 3.5-GHz Range [Wireless Corner]},
	journal = {IEEE Antennas and Propagation Magazine},
	volume = {61},
	number = {4},
	year = {2019},
	month = {Aug},
	pages = {97-108},
	keywords = {5G communications, 5G mobile communication, 5G terrestrial communications, Antenna arrays, antenna radiation patterns, array elements, array signal processing, Beam steering, circular conformal array antenna, Conformal antenna, Conformal antennas, conformal structure, double-stacked microstrip patches, eight-way tunable feeding network, frequency 3.5 GHz, Frequency measurement, microstrip, microstrip antenna arrays, octagonal holding structure, omnidirectional antennas, omnidirectional radiation, P-i-n diodes, Power dividers, single radiating elements, T-junction operation modes, TFN network, tunable T-junctions},
	issn = {1558-4143},
	doi = {10.1109/MAP.2019.2920049},
	author = {P Sanchez-Olivares and P Sanchez-Dancausa and J L Masa-Campos and M Iglesias-Menendez-de-la-Vega and E Garcia-Marin}
}
@article {19_ANT_MAG_EDUARDO_5G_SIW,
	title = {Planar Array Topologies for 5G Communications in Ku Band [Wireless Corner]},
	journal = {IEEE Antennas and Propagation Magazine},
	volume = {61},
	number = {2},
	year = {2019},
	month = {April},
	pages = {112-133},
	keywords = {5G communication environment, 5G communications, 5G mobile communication, antenna array, Antenna arrays, antenna feeds, antenna radiation patterns, dielectric losses, directivity performance, feeding network configurations, Ku band, microstrip, microstrip antenna arrays, Microstrip antennas, microstrip dielectric loss, planar antenna arrays, planar array topologies, radiating elements, SIW feeding network, SIW technologies, substrate integrated waveguide, substrate integrated waveguides, Substrates, two-level corporate feeding network},
	issn = {1558-4143},
	doi = {10.1109/MAP.2019.2895633},
	author = {E Garcia-Marin and J L Masa-Campos and P Sanchez-Olivares}
}
@article {19_ANT_MAG_EDUARDO_5G_SIW,
	title = {Planar Array Topologies for 5G Communications in Ku Band [Wireless Corner]},
	journal = {IEEE Antennas and Propagation Magazine},
	volume = {61},
	number = {2},
	year = {2019},
	month = {April},
	pages = {112-133},
	keywords = {5G communication environment, 5G communications, 5G mobile communication, antenna array, Antenna arrays, antenna feeds, antenna radiation patterns, dielectric losses, directivity performance, feeding network configurations, Ku band, microstrip, microstrip antenna arrays, Microstrip antennas, microstrip dielectric loss, planar antenna arrays, planar array topologies, radiating elements, SIW feeding network, SIW technologies, substrate integrated waveguide, substrate integrated waveguides, Substrates, two-level corporate feeding network},
	issn = {1558-4143},
	doi = {10.1109/MAP.2019.2895633},
	author = {E. Garcia-Marin and J. L. Masa-Campos and P. Sanchez-Olivares}
}
@conference {19_EUCAP_EDUARDO_MONOPULSO_DIFF_BONDING,
	title = {W-band Monopulse Antenna Array Manufactured by Diffusion Bonding},
	booktitle = {2019 13th European Conference on Antennas and Propagation (EuCAP)},
	year = {2019},
	month = {March},
	pages = {1-5},
	keywords = {16 circularly polarized radiating cavities, antenna feeds, antenna radiation patterns, array signal processing, beamforming network, copper sheets, corporate waveguide feeding network, Diffusion bonding, diffusion bonding technology, electromagnetic wave polarisation, etching, etching proces, frequency 90.0 GHz to 98.0 GHz, impedance matching, input matching, millimeter wave technology., millimetre wave antenna arrays, monopulse capabilities, noise figure -10.0 dB, noise figure -15.0 dB, noise figure -20.0 dB, noise figure 2.0 dB, Planar arrays, principal radiation planes, radar antennas, simulated axial ratio, Taylor distribution, W-band monopulse array antenna},
	issn = {null},
	url = {https://ieeexplore.ieee.org/document/8739388},
	author = {E Garcia-Marin and J L Masa-Campos and P Sanchez-Olivares}
}
@article {15_TAP_RubioIzqdoCorcoles_ModalNetworkMIMO,
	title = {Mutual Coupling Compensation Matrices for Transmitting and Receiving Arrays},
	journal = {IEEE Transactions on Antennas and Propagation},
	volume = {63},
	number = {2},
	year = {2015},
	month = {Feb},
	pages = {839-843},
	abstract = {A general method to obtain a matrix which allows the compensation of mutual coupling effects in transmitting arrays for the total field in all directions is introduced. This method is independent of the numerical method used in the analysis and it can include the effect of the antenna platform. The starting point can be the active element patterns or the spherical mode expansion from spherical near-field antenna measurements. Additionally, the spherical mode expansion is also used to find a matrix which allows the compensation of mutual coupling effects in receiving arrays. Through this theory, a simple relation between the compensation matrices of the transmitting and the receiving arrays is found. As a consequence, the scattering matrix of a circuit that allows the simultaneous compensation of mutual coupling effects for the transmission and the reception problem can be easily defined. Finally, it will be shown how the capabilities of the compensation in all directions depend strongly on the array element.},
	keywords = {Active element pattern, antenna array, Antenna arrays, Antenna measurements, antenna radiation patterns, finite element analysis, Mutual coupling, mutual coupling compensation, spherical mode expansion, transmitting antennas, Vectors},
	issn = {0018-926X},
	doi = {10.1109/TAP.2014.2382691},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=6987253},
	author = {Rubio, J and Izquierdo, J F and J C{\'o}rcoles}
}
@article {15_TAP_Corcoles_RLAQCQP,
	title = {Reactively Loaded Array Pattern Synthesis as a Quadratically Constrained Quadratic Program},
	journal = {Antennas and Propagation, IEEE Transactions on},
	volume = {63},
	number = {11},
	year = {2015},
	month = {Nov},
	pages = {5219-5224},
	abstract = {The pattern synthesis problem of maximizing the gain at a scanning direction subject to a maximum sidelobe level for a reactively loaded antenna array is formulated as a quadratically constrained quadratic program (QCQP). This formulation is derived from the scattering matrix and the active element patterns of the array considering both fed and loaded antennas as ports. Since the resulting QCQP is nonconvex, the loads are computed from the solution of the semidefinite relaxation of the problem by forcing the feasibility of the constraints in a meaningful physical sense, i.e., by explicitly imposing passive or purely reactive loads. Numerical results of dipole arrays with various configurations are presented and compared to previous works.},
	keywords = {Antenna arrays, Antenna pattern synthesis, antenna radiation patterns, Arrays, dipole antenna arrays, dipole array, Gain, Loaded antennas, optimization, Optimization methods, Ports (Computers), QCQP, quadratic programming, quadratically constrained quadratic program, reactively loaded array pattern synthesis, reconfigurable antennas, S-matrix theory, scattering matrix, semidefinite (SD) programming, semidefinite programming, semidefinite relaxation, sidelobe level, sidelobe supression},
	issn = {0018-926X},
	doi = {10.1109/TAP.2015.2478487},
	author = {J C{\'o}rcoles}
}
@article {14_TAP_SANCHEZ-OLIVARES_PFC,
	title = {Novel Four Cross Slot Radiator With Tuning Vias for Circularly Polarized SIW Linear Array},
	journal = {Antennas and Propagation, IEEE Transactions on},
	volume = {62},
	number = {4},
	year = {2014},
	month = {April},
	pages = {2271-2275},
	abstract = {A substrate integrated waveguide (SIW) linear array is presented with a new circularly polarized (CP) element. The single radiator consists of four cross tilted slots. In addition, a pair of tuning metallic vias is included to improve the reflection of longest slots. A 16-element antenna prototype with -26-dB Taylor distribution and 1.5\% residual power was designed, manufactured and measured to verify the new slot performance in an array configuration. A 17-dB peak gain, 1.86-dB axial ratio and 80\% radiation efficiency were experimentally achieved at 17 GHz. A 3\% usable bandwidth was obtained owing to frequency main beam tilt dispersion.},
	keywords = {16-element antenna prototype, antenna, Antenna measurements, antenna radiation patterns, array configuration, Arrays, circular polarization (CP), circularly polarized element, circularly polarized linear array, Couplings, four cross slot radiator, four cross tilted slots, frequency 17 GHz, frequency main beam tilt dispersion, linear antenna arrays, linear array, metallic vias, microwave antenna arrays, radiation efficiency, Reflection, single radiator, SIW linear array, slot, slot antenna arrays, substrate integrated waveguide, substrate integrated waveguide (SIW), substrate integrated waveguides, Substrates, Taylor distribution, Tuning, tuning via, tuning vias},
	issn = {0018-926X},
	doi = {10.1109/TAP.2014.2299823},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=6710164},
	author = {P Sanchez-Olivares and J L Masa-Campos}
}
@article {13_AWPL_GARCIA-VALVERDE_PFC,
	title = {Linear Patch Array Over Substrate Integrated Waveguide for Ku-Band},
	journal = {IEEE Antennas and Wireless Propagation Letters},
	volume = {12},
	year = {2013},
	pages = {257-260},
	abstract = {A linearly polarized patch array with direct probe feed over substrate integrated waveguide (SIW) network (LP-PASIW) for Ku-band is presented. A double-stacked microstrip patch structure has been used as radiating elements. Internal SIW coupling patches are placed inside the SIW to obtain the desired radiation pattern. The internal coupling and external radiating patches are connected by means of copper vias. A mutual coupling model is also proposed to adjust the radiation and reflection properties of the array. An antenna prototype has been manufactured and measured. At 17.7 GHz, 16 dBi and 80\% peak gain and efficiency values are obtained. Although a 10\% reflection bandwidth (17-18.6 GHz) is achieved, the usable bandwidth is reduced to 3\% due to array beam tilt dispersion.},
	keywords = {antenna feeds, antenna prototype, antenna radiation patterns, Antennas, array beam tilt dispersion, Arrays, bandwidth 17 GHz to 18.6 GHz, Brain modeling, Couplings, direct probe feed, double-stacked microstrip patch structure, Double-stacked patch, efficiency 80 percent, electromagnetic wave polarisation, external radiating patches, frequency 17.7 GHz, hybrid LSM$^{{rm y}{\textquoteright}}$ mode, internal coupling patches, internal SIW coupling patches, linearly polarized patch array, LP-PASIW, microstrip antenna arrays, microwave antenna arrays, Mutual coupling, mutual coupling model, radiating elements, radiation pattern, Reflection, substrate integrated waveguide (SIW), substrate integrated waveguide network, substrate integrated waveguides, Substrates, waveguide antenna arrays},
	issn = {1536-1225},
	doi = {10.1109/LAWP.2013.2245623},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=6451111\&tag=1},
	author = {D Garcia-Valverde and J L Masa-Campos and P Sanchez-Olivares and B Taha-Ahmed and J C{\'o}rcoles}
}
@conference {12_EUCAP_SANCHEZ-OLIVARES_16siw,
	title = {Slot radiator with tuning vias for circularly polarized SIW linear array},
	booktitle = {Antennas and Propagation (EUCAP), 2012 6th European Conference on},
	year = {2012},
	month = {March},
	pages = {3716-3720},
	abstract = {A 16-element circularly polarized (CP) Substrate Integrated Waveguide (SIW) linear array antenna with -26 dB Taylor distribution and 2\% residue power at 17 GHz is designed. The single element consists of four crossed inclined radiating slots. In this configuration, reflection goals on the linear array are not fully achieved. For this reason a tuning element is included on some of the individual radiating elements, which consists of a pair of metallic vias that greatly enhances the reflection of longest slots. Therefore, the antenna reflection is also improved. A global antenna prototype is manufacture to check the new slot element performance in an array configuration. The specified operation band is 16.3 to 17.7 GHz.},
	keywords = {16-element circularly-polarized SIW linear array antenna, antenna radiation patterns, antenna reflection, Arrays, circular polarization (CP), electromagnetic wave polarisation, frequency 16.3 GHz to 17.7 GHz, linear antenna arrays, metallic vias, prototypes, radiating elements, Reflection, slot antenna arrays, Slot antennas, Slot array antenna, slot radiator, slot reflection, substrate integrated waveguide, substrate integrated waveguide (SIW), substrate integrated waveguides, Substrates, Taylor distribution, Tuning, tuning element, tuning via, tuning vias},
	doi = {10.1109/EuCAP.2012.6205816},
	author = {P Sanchez-Olivares and J L Masa-Campos}
}
@article {11_TAP_CorcolesRubio_SphericalSynthesis,
	title = {Spherical-Wave-Based Shaped-Beam Field Synthesis for Planar Arrays Including the Mutual Coupling Effects},
	journal = {IEEE Transactions on Antennas and Propagation},
	volume = {59},
	number = {8},
	year = {2011},
	month = {Aug},
	pages = {2872-2881},
	abstract = {An analytical method to synthesize shaped-beam patterns with planar arrays, based on the handling of spherical waves, is proposed. Translational Addition Theorems will be used here for two different purposes: (1) relating the spherical modes produced by each element in the array to calculate the mutual coupling effects, and (2) expressing the field radiated by each element in terms of spherical modes corresponding to the whole array, to carry out a spherical-wave synthesis procedure based on the orthogonal properties of spherical modes. This field synthesis method is based on the fact that any antenna radiated field can be expressed as a discrete series of weighted spherical vector wave functions and it only requires the a priori knowledge of the Generalized Scattering Matrix of each array element considered as isolated from the rest of the array elements.},
	keywords = {antenna feeds, antenna radiated field, antenna radiation patterns, Arrays, electromagnetic coupling, electromagnetic wave scattering, field synthesis method, generalized scattering matrix, GSM, Mutual coupling, mutual coupling effect, pattern field synthesis, planar antenna arrays, planar array, planar array element, Planar arrays, S-matrix theory, Scattering, spherical wave expansion, spherical-wave synthesis procedure, spherical-wave-based shaped-beam field synthesis, translational addition theorem, translational addition theorems, weighted spherical vector wave function},
	issn = {0018-926X},
	doi = {10.1109/TAP.2011.2158950},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=5871276},
	author = {J C{\'o}rcoles and Rubio, J and Gonz{\'a}lez, M A}
}
@conference {09_EuCAP_Corcoles,
	title = {Array design for different SLL and null directions with an interior-point optimization method from the generalized-scattering-matrix and spherical modes},
	booktitle = {Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on},
	year = {2009},
	month = {March},
	pages = {1381-1385},
	abstract = {This paper presents a pattern synthesis technique for arbitrary planar arrays which can be characterized in terms of a generalized-scattering-matrix (GSM) and whose radiated field can be expressed as a spherical mode expansion (SME). The procedure yields the complex-valued excitations needed to achieve a pattern which fulfils the requirements of different sidelobe levels in different regions and several prescribed field nulls with a maximum directive gain. The formulation is based on matrix-valued functions which are computed from the GSM and the SME, so all interelement coupling effects coming from complex radiating structures used as array elements are inherently taken into account. To solve the resulting nonlinear optimization problem, a primal-dual interior-point filtering method specifically adapted to this formulation is developed. Numerical results are presented for arrays of microstrip patch antennas and dielectric resonator antennas.},
	keywords = {antenna pattern, antenna radiation patterns, antenna sidelobe level, dielectric resonator antenna, dielectric resonator antennas, electromagnetic coupling, Filtering, filtering theory, generalized scattering matrix, generalized-scattering-matrix, GSM, Hessian matrices, interelement coupling effect, interior-point optimization method, Jacobian matrices, microstrip antenna arrays, Microstrip antennas, microstrip patch antenna, Microstrip resonators, nonlinear optimization, optimisation, Optimization methods, pattern synthesis technique, planar antenna array, planar antenna arrays, Planar arrays, primal-dual interior-point filtering method, Resonator filters, S-matrix theory, spherical, spherical mode expansion, Transmission line matrix methods, wave expansion},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=5067872},
	author = {J C{\'o}rcoles and Gonz{\'a}lez, M A and Rubio, J and Zapata, J}
}
@article {09_AWPL_RubioCorcoles_InclusionFeedingNetwork,
	title = {Inclusion of the Feeding Network Effects in the Generalized-Scattering-Matrix Formulation of a Finite Array},
	journal = {IEEE Antennas and Wireless Propagation Letters},
	volume = {8},
	year = {2009},
	pages = {819-822},
	abstract = {The formulation of the generalized scattering matrix (GSM) of a finite array is revised to take into account the feeding network effects in the calculation of the external mutual coupling. It allows the analysis of finite arrays of externally coupled elements whose radiated field can be described by means of spherical waves on a ground plane, such as apertures, monopoles, cavity-backed patch antennas, or dielectric resonator antennas (DRAs), including rigorously the mismatching and internal coupling effects because of the feeding network.},
	keywords = {antenna feeds, antenna radiation pattern, antenna radiation patterns, aperture antenna, cavity-backed patch antenna, dielectric resonator antenna, dielectric resonator antennas, DRA, electromagnetic coupling, entire-domain basis function, Entire-domain basis functions, external mutual coupling, feeding network effect, finite array, generalized scattering matrix (GSM), generalized scattering matrix formulation, GSM, internal coupling effect, mismatching effect, monopole antenna, multiport networks, Mutual coupling, S-matrix theory, spherical wave, spherical wave expansion, waveguide antenna arrays, waveguide-fed array},
	issn = {1536-1225},
	doi = {10.1109/LAWP.2009.2026715},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=5159466},
	author = {Rubio, J and J C{\'o}rcoles and Gonzalez de Aza, M A}
}
@article {09_AWPL_Corcoles_MutualCouplingCompensation,
	title = {Mutual Coupling Compensation in Arrays Using a Spherical Wave Expansion of the Radiated Field},
	journal = {IEEE Antennas and Wireless Propagation Letters},
	volume = {8},
	year = {2009},
	pages = {108-111},
	abstract = {This letter presents a flexible method to compensate the interelement mutual coupling (MC) effects that may degrade the field pattern of an array of real and coupled antennas. A closed-expression for a mutual coupling compensation matrix (MCCM) is derived. The MCCM is used to compensate the presence of the real individual elements{\textquoteright} patterns and the interelement MC effects for any excitations obtained with an isotropic-based pattern synthesis method. The MCCM is calculated from the generalized scattering matrix (GSM) of an antenna array and the spherical mode expansion (SME) of its radiated field. For a given array, this MCCM has to be calculated only once since it only depends on the radiating and scattering characteristics of the antenna elements as well as on their location in the array. Conditions regarding null field pattern directions can also be reinforced in the MCCM. To compute the GSM of the array and the SME of the radiated field, a validated full-wave hybrid and modular methodology is used. Numerical results of synthesized patterns where the MC effects have been compensated are presented for arrays made up of dielectric resonator antennas.},
	keywords = {antenna array, Antenna array mutual coupling, Antenna arrays, antenna radiation patterns, dielectric resonator antennas, electromagnetic coupling, field pattern, field radiation, generalized scattering matrix, interelement mutual coupling effect, isotropic-based pattern synthesis method, modular methodology, mutual coupling compensation matrix, Planar arrays, quadratic programming, S-matrix theory, scattering matrices, spherical wave expansion},
	issn = {1536-1225},
	doi = {10.1109/LAWP.2008.2012276},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=4745777},
	author = {J C{\'o}rcoles and Gonz{\'a}lez, M A and Rubio, J}
}
