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[ES] La tecnología Gap Waveguide representa una alternativa interesante como línea de transmisión de bajas pérdidas, eficiente y de alto rendimiento en frecuencias de microondas y bandas milimétricas. Una de las características que diferencia a esta tecnología de otras existentes es la no necesidad de tener contacto eléctrico entre dos piezas metálicas. En este Trabajo de Fin de Grado (TFG) se propone el diseño de un filtro paso banda en banda K (19.7 a 21.2 GHz) mediante la tecnología GW. Dicho filtro se integrará finalmente con otro, diseñado previamente y que trabaja en la banda Ka (30 GHz), en un diplexor. Por lo tanto, el sistema trabajará simultáneamente en recepción y transmisión en las bandas de 20 y 30 GHz, respectivamente. La aplicación directa de este diseño es integrar el diplexor realizado en este TFG en un sistema completo cuyas aplicaciones son las comunicaciones por satélite en movimiento (SATCOM-onthe-move)., [EN] Gap Waveguide technology represents an interesting alternative as a low-loss, efficient and high-performance transmission line in microwave frequencies and millimeter bands. One of the characteristics that differentiates this technology from existing ones is the lack of electrical contact between two metal parts. In this Bachelor¿s Thesis, the design of a band-pass filter in K band (19.7 to 21.2 GHz) using GW technology is proposed. This filter will finally be integrated with another one, previously designed and working in the Ka band (30 GHz), in a diplexer. Therefore, the system will work simultaneously in reception and transmission in the 20 and 30 GHz bands, respectively. The direct application of this design is to integrate the diplexer made in this Bachelor¿s Thesis into a complete system whose applications are satellite communications in motion (SATCOMon-the-move).

This paper presents an alternative to significantly reduce the time and difficulty in designing and fabricating antennas in Gap Waveguide technology (GW) by using a novel half-mode groove gap waveguide. GW is often criticized within the subtractive manufacturing field for the high fabrication time required to mill many pins with the waveguides in the same piece. To demonstrate the possibilities of this new approach, two different antennas have been designed, fabricated, and measured. Both antennas, formed by only two pieces with no contact, operate from 29 GHz to 31 GHz and present reflection coefficients below −10 dB and high antenna efficiency above 90%. In addition, both prototypes can reuse the bed of nails, which favors shorter manufacturing times and lower costs in the development phase.

[ES] Las guías de onda con paredes laterales corrugadas (en inglés Groove Gap Waveguides, GGWs) son un prometedor medio de transmisión a emplear en futuras aplicaciones espaciales, pues su fabricación resulta más sencilla tecnológicamente que las clásicas guías de onda rectangular, y son capaces de ofrecer prestaciones similares. Con el objeto de explorar su potencial uso en el entorno espacial (en cargas útiles de comunicaciones por satélite), es necesario estudiar la capacidad de manejo de potencia de las mismas en condiciones de alto vacío (mediante la estimación de la potencia umbral del efecto indeseado conocido como multipactor). En este proyecto, se pretende estudiar el citado efecto multipactor en estas nuevas guías GGWs, haciendo uso de modelos disponibles en programas informáticos comerciales. Para validar estos resultados, se diseñarán también diversos prototipos sencillos de componentes basados en dichas guías (por ejemplo adaptadores de impedancia), y se explorará también su posible fabricación y la posterior realización de medidas (tanto de respuesta eléctrica, como del citado efecto multipactor)., [EN] Groove Gap Waveguides (GGWs) are a promising transmission line to be used in future space applications, since their manufacture is more simple technologically than the classic rectangular waveguides, and are able to offer similar performance. In order to explore their potential use in the space sector (within satellite communications payloads), it is necessary to study their power handling capabilities under high vacuum conditions (i.e. the estimation of the threshold power of the undesirable effect known as multipactor). This final year work aims to study the aforementioned multipactor effect in these new GGWs, making use of models available in commercial software tools. To validate these results, several prototypes of simple components based on GGWs (for example impedance matching networks) will be designed. Their manufacture and the realization of measurements (of the electric response and the aforementioned multipactor effect) will be also explored.

© 2021 IEEE. Personal use of this material is permitted. Permissíon from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertisíng or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works., [EN] This letter presents a 4 x 4 single-layer dual-band array antenna operating in the K- and Ka-band using gap waveguide (GW) technology. Radiating elements consist of I-shaped slots located on the top plate of the antenna and backed by a novel coaxial cavity with the dual-frequency operation. The antenna presents two ports, one for each band, and radiates a directive far field pattern with linear polarization. A single-layer wideband corporate-feed network is used to excite the cavities. In addition, a diplexer is integrated as part of the network to separate both working bands. Experimental results show impedance and radiation pattern bandwidths larger than 2 GHz in both bands.

In this letter, a half-mode waveguide based on gap waveguide (GW) technology for rapid prototyping is explored. Two devices have been designed and measured for demonstration purposes: a power divider and a curved waveguide. Both devices are constructed from two noncontacting metal pieces. Both devices also follow the same design process. In the bottom piece, a horizontally polarized groove GW (GGW) is housed. The height of the groove is about half, which is required to propagate the fundamental mode. The top cover is a uniform pinned surface that acts as a high impedance surface (HIS) over the groove below. Both the power divider and the curved waveguide show measured reflection coefficient values of less than -15 dB in the bandwidth of interest (28-31 GHz) and are in excellent agreement with simulated results. These devices stand out for their ease of fabrication and open a horizon for cheaper and more robust GW designs for mass production.

This paper presents a 4 x 4 single-layer dual-band array antenna operating in K and Ka-band using Gap Waveguide technology (GW). Radiating elements consist of I-shaped slots located on the top plate of the antenna and cavity backed by a novel coaxial cavity with dual-frequency operation. The antenna presents two ports, one for each band, which radiate a directive far field pattern with linear polarization. A single-layer high-bandwidth corporate-feed network is used to excite the cavities. In addition, a diplexer is integrated as part of the network to separate both working bands. Experimental results show impedance and radiation pattern bandwidths larger than 2 GHz in both bands.

[ES] En la actualidad, el diseño de sistemas de comunicación se está orientando a altas frecuencias. El espectro radioeléctrico está saturado en frecuencias bajas y surge la necesidad de diseñar sistemas que puedan trabajar en bandas más altas. El Grupo de Radiación Electromagnética, perteneciente al ITEAM de la Universidad Politécnica de Valencia, centra gran parte de su trabajo e investigación en el diseño de elementos radiantes a frecuencias superiores a 60 GHz. La tecnología LTCC aporta muy buenas características para la construcción de circuitos de microondas que deban trabajar en bandas altas. Sin embargo, es una tecnología implantada hace poco y aún queda mucho camino por recorrer para sacar el máximo rendimiento de ella. En el ámbito de investigación es importante contar con elementos conocidos que sean fiables. El objetivo de este Trabajo Final de Grado será diseñar transiciones entre dos líneas de transmisión de tecnologías distintas a fin de obtener un diseño que futuros proyectistas puedan usar en su trabajo., [EN] Optimal transitions would be designed in LTCC for different transmission lines at different bands.

[ES] El objetivo de esta tesis es diseñar una antena para un sistema antirrobo de bicicletas. La antena está basada en una PIFA conformada sobre el manillar que funcione en las bandas de GPS (Localización de la bici), GSM (para transmitir la información de localización) y en Wifi/Bluetooth (aprovechar radio-balizas en lugar de GSM y/o proveer al usuario de cierta conectividad con el dispositivo), [EN] The aim of this thesis is to design an antenna for a bicycle anti-theft system. The antenna is based on a PIFA conformed on the handlebar that works in the bands of GPS (Location of the bike), GSM (to transmit location information) and Wifi/Bluetooth (use radio beacons instead of GSM and/or provide the user with some connectivity with the device).

[EN] In this paper, we propose a compact topology for high-frequency bandpass filters using coaxial cavities embedded in a bed of nails, including a complete design procedure combining equivalent circuit models and full-wave simulators. The resonance generated around a shortened cylindrical nail of the bed hosting structure is used as the basic element of the proposed filter, which is fed through groove gap waveguides. For design purposes, an equivalent circuit model of the considered resonance is first obtained, and then the coupling levels between resonators are recovered with the distance between adjacent shortened nails. In order to validate the proposed structure and its design procedure, a filter prototype with a bandpass response (centered at 30 GHz and with relative bandwidth of 1.7%) has been designed, manufactured, and measured. Good experimental results, in terms of insertion losses (with a minimum value of 1.6 dB) and return losses (greater than 16.6 dB in the whole passband), have been achieved.

[EN] This paper describes a new family of all-metallic radiators based on below-cutoff apertures fed by evanescentmode ridge waveguide filters. The pass band of the filters and the polarization of the apertures are configured to radiate orthogonal signals at different center frequencies. The simultaneous operation of these radiators in an array configuration results in interleaved apertures producing overlapped fields. This strategy reduces the volume and weight of the antenna system, which is a specially appealing characteristic in satellite antennas. Each isolated evanescent-mode filter ends in a small-size aperture and is designed following a novel synthesis procedure. Next, the radiating elements are combined, and the resulting array is analyzed as a multiplexer from the input ports to the freespace region thus accounting for all mutual couplings between different apertures. To validate the theoretical formulations, a prototype has also been manufactured. The results obtained show very good agreement between simulation and measurements in terms of reflection coefficient, side-lobe level and realized gain, thereby fully validating the new family of radiating arrays.

[ES] Se pretende diseñar un filtro paso banda centrado en 30 GHz insertado en una estructura periódica de pines. Para ello se aprovechará la resonancia que aparece cuando uno de los pines se rebaja en altura. La ubicación de los pines rebajados se mantendrá fija y se controlará el acoplo entre pines haciendo uso de una ventana de acoplo controlada por la distancia entre pines no rebajados. La alimentación de los pines de entrada y salida se hará mediante una ventana de acoplo conectada con una guía estandar.

[ES] En este trabajo abordaremos el diseño de una antena tipo parche que irá embarcada en un satélite de reducido peso y dimensiones situado en órbita baja. Para ello se realizará una comparativa de diferentes tipos de antenas y se buscará la optimización de sus prestaciones. Este diseño está hecho en colaboración con la empresa Altran para una de sus misiones de espacio, dentro del departamento de I+D. La antena deberá tener un buen comportamiento a las frecuencias de 5,25 GHz y 5,75 GHz, polarización circular y un ancho de haz (HPBW) de 90º. Para ello se simularán diferentes tipos de parches y agrupaciones buscando un diseño que se adapte a las especificaciones requeridas para la misión., [EN] In this paper, the design of a patch antenna that will be shipped on a satellite of reduced weight and dimensions located in low orbit is studied. For this, a comparison of different types of antennas will be carried out and the optimization of their benefits will be sought. This design is a collaboration with a company called Altran for one of its space missions, within the R & D department. The antenna should have a good performance at the frequencies of 5.25 GHz and 5.75 GHz, circular polarization and a beam width (HPBW) of 90º. For this purpose, different types of patches antennas and arrays will be simulated looking for a design that meets the specifications required for the mission.

This paper presents a third-order bandpass filter with a two-way power splitter working between 29.5 GHz and 31 GHz in gap waveguide technology. This filter will be part of a diplexer integrated in ground terminals of future high throughput satellite systems. A shortened pin has been chosen as resonator. The coupling between resonators is controlled with the shortened pins distance. A standard rectangular waveguide WR-28 has been chosen as input port, and a coupling window is used to feed the first resonator. The last resonator is coupled to a Groove Gap Waveguide (GGW), which eventually will feed the subarrays. In order to measure the isolated response of the filter-splitter, before being integrated in the antenna, a transition between the GGW and the WR-28 has been designed.

In this paper, we propose a compact topology for high-frequency bandpass filters using coaxial cavities embedded in a bed of nails, including a complete design procedure combining equivalent circuit models and full-wave simulators. The resonance generated around a shortened cylindrical nail of the bed hosting structure is used as the basic element of the proposed filter, which is fed through groove gap waveguides. For design purposes, an equivalent circuit model of the considered resonance is first obtained, and then the coupling levels between resonators are recovered with the distance between adjacent shortened nails. In order to validate the proposed structure and its design procedure, a filter prototype with a bandpass response (centered at 30 GHz and with relative bandwidth of 1.7%) has been designed, manufactured, and measured. Good experimental results, in terms of insertion losses (with a minimum value of 1.6 dB) and return losses (greater than 16.6 dB in the whole passband), have been achieved.

A system for systematic measurement of the electromagnetic characteristics at microwave band of technical ceramics will be developed. For the system design it will use some commercial electromagnetic simulator. The designed system will be built and validated with measurements of different ceramics., Se desarrollará un sistema para la medida sistemática de las características electromagnéticas en la banda de microondas de cerámicas técnicas. Para el diseño del sistema se hará uso de algún simulador electromagnético comercial. Se fabricará el sistema diseñado y se validará con medidas de diferentes cerámicas.

[EN] This paper presents the design, low-temperature co-fired ceramics (LTCC) fabrication, and full experimental verification of novel dielectric flat lens antennas for future high data rate 5G wireless communication systems in the 60 GHz band. We introduce and practically completely evaluate and compare the performance of three different inhomogeneous gradient-index dielectric lenses with the effective parameters circularly and cylindrically distributed. These lenses, despite their planar profile antenna configuration, allow full 2-D beam scanning of high-gain radiation beams. A time-domain spectroscopy system is used to practically evaluate the permittivity profile achieved with the LTCC manufacturing process, obtaining very good results to confirm the viability of fabricating inhomogeneous flat lenses in a mass production technology. Then, the lenses performance is evaluated in terms of radiation pattern parameters, maximum gain, beam scanning, bandwidth performance, efficiencies, and impedance matching in the whole frequency band of interest. Finally, the performance of the three lenses is also experimentally evaluated and compared to a single omni-directional antenna and to a ten-element uniform linear array of omni-directional antennas in real 60 GHz wireless personal area network indoor line-of-sight (LOS) and obstructed-LOS environments, obtaining interesting and promising remarkable results in terms of measured received power and root-mean-square delay spread. At the end of this paper, an innovative switched-beam antenna array concept based on the presented cylindrically distributed effective parameters lens is also introduced and completely evaluated, confirming the potential applicability of the proposed antenna solution for future 5G wireless millimeter-wave communication system.

Different solutions will be studied for the realization of hybrid directional couplers in the 60 GHz bands, in order to achieve right and left circular polarization in an antenna system for satellite communications. Moreover, a bandpass filter design will be carried out, working in the 30 GHz band. Either the filter and the coupler will be realized by means of groove gap waveguide technology., Se estudiarán diferentes soluciones para la realización de acopladores direccionales híbridos en las bandas de 60 GHz, con el objetivo de conseguir polarización circular a derechas y a izquierdas en un sistema de antenas para comunicaciones por satélite. Además, se llevará a cabo el diseño de un filtro paso banda mediante acopladores que trabaja en la banda de 30 GHz. Tanto el filtro como el acoplador se realizarán mediante la tecnología de ranuras en guías de onda.

[EN] In this letter, a three-dimensional antenna solution for automotive applications is presented. The proposed solution is formed by two independent antennas, perpendicularly placed inside a plastic cover with a shark-fin shape. The antennas, designed with low-cost materials, exhibit omnidirectional radiation patterns in the azimuthal plane. The first antenna is a doubleshorted monopole that provides service from 698 to 960 MHz (in the LTE700, GSM850, and GSM900 bands), whereas the second antenna is a drop-shaped monopole that operates from 1.7 to 2.7 GHz (in the DCS1800, PCS1900, WCDMA2100, WLAN2400, LTE2600, WiMAX2350, and Wi-Fi at 2.4-GHz bands), and from 5.1 to 6 GHz (in theWi-Fi at 5 GHz and C2C bands). Results show a good matching and radiation efficiency at all bands.

[EN] This communication describes a multimode equivalent network (MEN) representation of a finite array of open-ended lossless waveguides on an infinite ground plane. The derivation is based on an integral equation formulated at the interface between the waveguides and the free-space region. The MEN is formulated using the concept of accessible and localized modes, and includes ports for the free-space plane waves. The MEN derived can be easily combined with the MENs of other microwave components, thus allowing for the accurate analysis and design of more complex systems composed of waveguide elements and radiating apertures. Both simulated and experimental results are presented showing a very good agreement, thereby fully validating the proposed equivalent network representation.

This thesis tackles issues of particular interest regarding analysis and design of passive components at the mm-wave and Terahertz (THz) bands. Innovative analysis techniques and modeling of complex structures, design procedures, and practical implementation of advanced passive devices are presented. The first part of the thesis is dedicated to THz passive components. These days, THz technology suffers from the lack of suitable waveguiding structures since both, metals and dielectric, are lossy at THz frequencies. This implies that neither conventional closed metallic structures used at microwave frequencies, nor dielectric waveguides used in the optical regime, are adequate solutions. Among a variety of new proposals, the Single Wire Waveguide (SWW) stands out due to its low attenuation and dispersion. However, this surface waveguide presents difficult excitation and strong radiation on bends. A Dielectric-Coated Single Wire Waveguide (DCSWW) can be used to alleviate these problems, but advantages of the SWW are lost and new problems arise. Until now, literature has not given proper solution to radiation on bends and, on the other hand, rigorous characterization of these waveguides lacks these days. This thesis provides, for the first time, a complete modal analysis of both waveguides, appropriated for THz frequencies. This analysis is later applied to solve the problem of radiation on bends. Several structures and design procedures to alleviate radiation losses are presented and experimentally validated. The second part of the thesis is dedicated to mm-wave passive components. These days, when implementing passive components to operate at such small, millimetric wavelengths, to ensure proper metallic contact and alignment between parts results challenging. In addition, dielectric absorption becomes significant at mm-wave frequencies. Consequently, conventional hollow metallic waveguides and planar transmission lines present high attenuation so that new topologies, Esta tesis aborda problemas actuales en el análisis y diseño de componentes pasivos en las bandas de onda milimétrica y Terahercios (THz). Se presentan nuevas técnicas de análisis y modelado de estructuras complejas, procedimientos de diseño, e implementación práctica de dispositivos pasivos avanzados. La primera parte de la tesis se dedica a componentes pasivos de THz. Actualmente no se disponen de guías de onda adecuadas a THz debido a que ambos, metales y dieléctricos, introducen grandes pérdidas. En consecuencia, no es adecuado escalar las estructuras metálicas cerradas usadas en microondas, ni las guías dieléctricas usadas a frecuencias ópticas. Entre un gran número de recientes propuestas, la Single Wire Waveguide (SWW) destaca por su baja atenuación y casi nula dispersión. No obstante, como guía superficial, la SWW presenta difícil excitación y radiación en curvas. El uso de un recubrimiento dieléctrico, creando la Dielecric-Coated Single Wire Waveguide (DCSWW), alivia estos inconvenientes, pero las ventajas anteriores se pierden y nuevos problemas aparecen. Hasta la fecha, no se han encontrado soluciones adecuadas para la radiación en curvas de la SWW. Además, se echa en falta una caracterización rigurosa de ambas guías. Esta tesis presenta, por primera vez, un análisis modal completo de SWW y DCSWW, adecuado a la banda de THz. Este análisis es aplicado posteriormente para evitar el problema de la radiación en curvas. Se presentan y validan experimentalmente diversas estructuras y procedimientos de diseño. La segunda parte de la tesis abarca componentes pasivos de ondas milimétricas. Actualmente, estos componentes sufren una importante degradación de su respuesta debido a que resulta difícil asegurar contacto metálico y alineamiento adecuados para la operación a longitudes de onda tan pequeñas. Además, la absorción dieléctrica incrementa notablemente a estas frecuencias. En consecuencia, tanto guías metálicas huecas como líneas de transmisión planares conven, Aquesta tesi aborda problemes actuals en relació a l'anàlisi i disseny de components passius en les bandes d'ona mil·limètrica i Terahercis. Es presenten noves tècniques d'anàlisi i modelatge d'estructures complexes, procediments de disseny, i implementació pràctica de dispositius passius avançats. La primera part de la tesi es focalitza en components passius de THz. Actualment no es disposen de guies d'ona adequades a THz causa que tots dos, metalls i dielèctrics, introdueixen grans pèrdues. En conseqüència, no és adequat escalar les estructures metál·liques tancades usades en microones, ni les guies dielèctriques usades a freqüències òptiques. Entre un gran nombre de propostes recents, la Single Wire Waveguide (SWW) destaca per la seua baixa atenuació i quasi nul·la dispersió. No obstant això, com a guia superficial, la SWW presenta difícil excitació i radiació en corbes. L'ús d'un recobriment dielèctric, creant la Dielecric-Coated Single Wire Waveguide (DCSWW), alleuja aquests inconvenients, però els avantatges anteriors es perden i nous problemes apareixen. Fins a la data, no s'han trobat solucions adequades per a la radiació en corbes de la SWW. A més, es troba a faltar una caracterització rigorosa d'ambdues guies. Aquesta tesi presenta, per primera vegada, un anàlisi modal complet de SWW i DCSWW, adequat a la banda de THz. Aquest anàlisi és aplicat posteriorment per evitar el problema de la radiació en corbes. Es presenten i validen experimentalment diverses estructures i procediments de disseny. La segona part de la tesi es centra en components passius d'ones mil·limètriques. Actualment, aquests components pateixen una important degradació de la seua resposta a causa de que resulta difícil assegurar contacte metàl·lic i alineament adequats per a l'operació a longituds d'ona tan menudes. A més, l'absorció dielèctrica incrementa notablement a aquestes freqüències. En conseqüència, tant guies metàl·liques buides com línies de transmissió planars convencionals pr

El documento versa sobre la creción de un plan de empresa. El proyecto empresarial cubre la necesidad de conciliación de la vida laboral y profesional ofreciendo formación de alta calidad.Está dividido en tres bloques principales. El primer bloque, que está compuesto por los capítulos 2 y 3, comienza realizando un análisis del entorno donde se expone una problemática y se extraen unas necesidades; necesidades que se pretenden abordar planteando una estrategia empresarial. Continuamos con los capítulos 4 y 5 que forman el segundo bloque. Principalmente está formado por el plan de Marketing, donde se detalla el desarrollo de los productos/servicios que solucionarán la problemática expuesta, así como la implantación de los mismos. Finalmente, en los capítulos 6, 7, 8 y 9 se exponen los datos generales de la empresa constituida y el sistema organizativo de la misma, así como un análisis económico financiero del modelo de negocio planteado.

In this document the phenomenon of the propagation of electromagnetic fields inside the resonant cavities in a theoretical and experimental way will be addressed. The theoretical part will be developed for resonant cavities of rectangular, cylindrical and spherical geometry, with special attention to the latter. To do this, solutions of the Maxwell equations will be developed and developed by using vectorial potentials and the corresponding boundary conditions will be applied. Once the expressions of the fields have been obtained, they will be simulated with MatLab. The simulation will be carried out by means of the implementation of diverse functions and will be managed with a graphical interface (GUI) that will allow to collect the input parameters and present the results in a clear and visual way., En el presente documento se abordará el fenómeno de la propagación de campos electromagnéticos en el interior de cavidades resonantes de manera teórica y experimental. La parte teórica se desarrollará para cavidades resonantes de geometría rectangular, cilíndrica y esférica, con especial atención a esta última. Para ello se plantearán y desarrollarán soluciones de las ecuaciones de Maxwell mediante el uso de potenciales vectoriales y se aplicarán las correspondientes condiciones de contorno. Una vez obtenidas las expresiones de los campos, se procederá a la simulación de los mismos con MatLab. La simulación se llevará a cabo mediante la implementación de diversas funciones y se gestionará con una interfaz gráfica (GUI) que permitirá recoger los parámetros de entrada y presentar los resultados de manera clara y visual.

[EN] Barium titanate (BaTiO3 or BTO) is currently one of the most promising ferroelectric materials for enabling Pockels modulation that is compatible with silicon photonic circuits. The relative permittivity of BTO has been characterized in thin films deposited on a silicon-on-insulator (SOI) substrate. High values between 800 and 1600 have been estimated at 20 GHz. Furthermore, no substantial difference has been obtained by using BTO grown by molecular beam epitaxy and sputtering. The obtained permittivity has been used to properly design the RF electrodes for high-speed modulation in hybrid BTO/Si devices. Electrodes have been fabricated and the possibility of achieving modulation bandwidths up to 40 GHz has been demonstrated. The bandwidth is limited by the microwave propagation losses and, in this case, different losses have been measured depending on the BTO growth process.

A comparative study between groove gap waveguide (GGW) technology and classical H-plane rectangular waveguide (RWG) technology is presented by evaluating their performance in the implementation of a narrow-band filter at the V-band. A filter with the same specifications has been manufactured and measured for each technology. Measured responses are compared and a re-assembling robustness test is carried out. The GGW filter presents a better response and remains completely invariant to the re-assembling process, which is shown to affect notably the RWG filter response. Remarkable low insertion loss of only 1.5 dB (cavities equivalent quality factor higher than 800) is obtained for the GGW filter.

(c) 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works., Recently, gap waveguides have been shown as a potential alternative to convenational waveguides in the millimeter-wave band. Until now, groove gap waveguide (GGW) has been studied through direct correspondence with rectangular waveguide with the same physical dimensions. However, there have been observed differences in the above cutoff propagation characteristics between these two waveguide types. Furthermore, the behavior of GGW below cutoff remains unknown. This work presents a discussion of both below and above cutoff propagation characteristics of GGW, and introduces a simple model that explains the observed GGW behavior and establishes well its propagation characteristics. Two thru-reflect-line calibration kits have been manufactured, and the measurements have good agreement with the proposed analysis model results.

This is the peer reviewed version of the following article: Carrera-Suárez, F., Navarro-Méndez, D., Baquero-Escudero, M. and Sánchez-Escuderos, D. (2016), Transition between gap waveguides for use in multilayer structures at millimeter-wave frequencies. Microw. Opt. Technol. Lett., 58: 102–106., which has been published in final form at http://dx.doi.org/10.1002/mop.29507. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving., A compact twist to connect a ridge-gap waveguide and a groove-gap waveguide in the Ka-band is presented. Measured insertion loss for a single twist is around 0.5 dB between 37.5 and 39 GHz. Return loss for a double twist is better than 12 dB in the same frequency range. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:102-106, 2016

(c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works., This paper describes the design and realization of a transition from a microstrip line to a ridge gap waveguide operating between 95 and 115 GHz. The study includes simulations, measurements, and a Monte Carlo analysis of the assembly tolerances. The purpose of this tolerance study is to identify the most critical misalignments that affect the circuit performance and to provide guidelines about the assembly tolerance requirements for the proposed transition design