Capítols de llibrehttp://hdl.handle.net/2117/55872024-03-19T01:47:10Z2024-03-19T01:47:10ZRF-MEMS switches designed for high-performance uniplanar microwave and mm-wave circuitsPradell i Cara, LluísGirbau Sala, DavidRibó Pal, MiquelCasals Terré, JasminaLázaro Guillén, AntonioContreras Lizárraga, AdriánLlamas Morote, Marco AntonioHeredia Vega, Julio CésarGiacomozzi, FlavioMargesin, Bennohttp://hdl.handle.net/2117/1283332020-07-23T22:35:50Z2019-02-04T14:40:16ZRF-MEMS switches designed for high-performance uniplanar microwave and mm-wave circuits
Pradell i Cara, Lluís; Girbau Sala, David; Ribó Pal, Miquel; Casals Terré, Jasmina; Lázaro Guillén, Antonio; Contreras Lizárraga, Adrián; Llamas Morote, Marco Antonio; Heredia Vega, Julio César; Giacomozzi, Flavio; Margesin, Benno
Radio frequency microelectromechanical system (RF-MEMS) switches have demonstrated superior electrical performance (lower loss and higher isolation) compared to semiconductor-based devices to implement reconigurable microwave and millimeter(mm)-wave circuits. In this chapter, electrostatically actuated RF-MEMS switch conigurations
that can be easily integrated in uniplanar circuits are presented. The design procedure and fabrication process of RF-MEMS switch topologies able to control the propagating modes of multimodal uniplanar structures (those based on a combination of coplanar waveguide (CPW), coplanar stripline (CPS), and slotline) will be described in
detail. Generalized electrical (multimodal) and mechanical models will be presented and applied to the switch design and simulation. The switch-simulated results are compared to measurements, conirming the expected performances. Using an integrated RF-MEMS surface micromachining process, high-performance multimodal reconigurable circuits, such as phase switches and ilters, are developed with the proposed switch conigurations. The design and optimization of these circuits are discussed and the simulated results compared to measurements.
2019-02-04T14:40:16ZPradell i Cara, LluísGirbau Sala, DavidRibó Pal, MiquelCasals Terré, JasminaLázaro Guillén, AntonioContreras Lizárraga, AdriánLlamas Morote, Marco AntonioHeredia Vega, Julio CésarGiacomozzi, FlavioMargesin, BennoRadio frequency microelectromechanical system (RF-MEMS) switches have demonstrated superior electrical performance (lower loss and higher isolation) compared to semiconductor-based devices to implement reconigurable microwave and millimeter(mm)-wave circuits. In this chapter, electrostatically actuated RF-MEMS switch conigurations
that can be easily integrated in uniplanar circuits are presented. The design procedure and fabrication process of RF-MEMS switch topologies able to control the propagating modes of multimodal uniplanar structures (those based on a combination of coplanar waveguide (CPW), coplanar stripline (CPS), and slotline) will be described in
detail. Generalized electrical (multimodal) and mechanical models will be presented and applied to the switch design and simulation. The switch-simulated results are compared to measurements, conirming the expected performances. Using an integrated RF-MEMS surface micromachining process, high-performance multimodal reconigurable circuits, such as phase switches and ilters, are developed with the proposed switch conigurations. The design and optimization of these circuits are discussed and the simulated results compared to measurements.Calibration methods in large interferometric radiometers devoted to earth observationTorres Torres, FranciscoCamps Carmona, Adriano JoséCorbella Sanahuja, IgnasiBará Temes, Francisco JavierDuffo Ubeda, NúriaVall-Llossera Ferran, Mercedes Magdalenahttp://hdl.handle.net/2117/229902021-05-21T09:13:21Z2014-05-14T13:43:44ZCalibration methods in large interferometric radiometers devoted to earth observation
Torres Torres, Francisco; Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena
This paper starts with a summary and classification of errors of any kind that corrupt the fundamental measurement performed by an InR (interferometric radiometer), the so-called visibilities. This summary is based on prior works from the authors concerning end-to-end rnodeling of the instrument. The paper follows with a
trade-off analysis of the capability of different calibration approaches to remove those errors and, at the end, to recover a map of brightness temperatures. In order to perform the trade-off analysis, extensive simulations have been undertaken to analyze the approaches found in the literature: the redundant space method, used in radio astronomy, the G-matrix method, used in ESTAR, and the Noise injection method. both centralized and distributed, proposed for MIRAS. A short description is made of each one and a comparative table is presented. The trade off is presented in terms of what kind of errors can be removed by each method, hardware requirements, robustness and on-ground/on-board input data required to perform such error correction.
2014-05-14T13:43:44ZTorres Torres, FranciscoCamps Carmona, Adriano JoséCorbella Sanahuja, IgnasiBará Temes, Francisco JavierDuffo Ubeda, NúriaVall-Llossera Ferran, Mercedes MagdalenaThis paper starts with a summary and classification of errors of any kind that corrupt the fundamental measurement performed by an InR (interferometric radiometer), the so-called visibilities. This summary is based on prior works from the authors concerning end-to-end rnodeling of the instrument. The paper follows with a
trade-off analysis of the capability of different calibration approaches to remove those errors and, at the end, to recover a map of brightness temperatures. In order to perform the trade-off analysis, extensive simulations have been undertaken to analyze the approaches found in the literature: the redundant space method, used in radio astronomy, the G-matrix method, used in ESTAR, and the Noise injection method. both centralized and distributed, proposed for MIRAS. A short description is made of each one and a comparative table is presented. The trade off is presented in terms of what kind of errors can be removed by each method, hardware requirements, robustness and on-ground/on-board input data required to perform such error correction.Sources of third–order intermodulation distortion in bulk acoustic wave devices: a phenomenological approachRocas Cantenys, EduardCollado Gómez, Juan Carloshttp://hdl.handle.net/2117/150922020-07-23T21:48:05Z2012-02-13T12:16:51ZSources of third–order intermodulation distortion in bulk acoustic wave devices: a phenomenological approach
Rocas Cantenys, Eduard; Collado Gómez, Juan Carlos
In this work, a model that uses several nonlinear parameters to predict harmonics and 3IMD distortion is presented. Its novelty lies in its ability to predict the nonlinear effects produced by self-heating in addition to those due to intrinsic nonlinearities in the material properties.
The model can be considered an extension of the nonlinear KLM model (originally proposed
by Krimholtz, Leedom and Matthaei) (Krimholtz et al., 1970) to include the thermal effects due to self-heating caused by viscous losses and electrode losses. For this purpose a thermal domain circuit model is implemented and coupled to the electro-acoustic model, which allows us to calculate the dynamic temperature variations that change the material properties. In comparison to (Rocas et al., 2009), this work describes the impact that electrode losses produce on the 3IMD, presents closed-form expressions derived from the circuit model and validates the model with extensive measurements that confirm the
necessity to include dynamic self-heating to accurately predict the generation of spurious
signals in BAW devices.
2012-02-13T12:16:51ZRocas Cantenys, EduardCollado Gómez, Juan CarlosIn this work, a model that uses several nonlinear parameters to predict harmonics and 3IMD distortion is presented. Its novelty lies in its ability to predict the nonlinear effects produced by self-heating in addition to those due to intrinsic nonlinearities in the material properties.
The model can be considered an extension of the nonlinear KLM model (originally proposed
by Krimholtz, Leedom and Matthaei) (Krimholtz et al., 1970) to include the thermal effects due to self-heating caused by viscous losses and electrode losses. For this purpose a thermal domain circuit model is implemented and coupled to the electro-acoustic model, which allows us to calculate the dynamic temperature variations that change the material properties. In comparison to (Rocas et al., 2009), this work describes the impact that electrode losses produce on the 3IMD, presents closed-form expressions derived from the circuit model and validates the model with extensive measurements that confirm the
necessity to include dynamic self-heating to accurately predict the generation of spurious
signals in BAW devices.