Selva Via - Academia.edu (original) (raw)
Papers by Selva Via
2012 42nd European Microwave Conference
Abstract This paper presents the implementation of Substrate Integrated Waveguide (SIW) component... more Abstract This paper presents the implementation of Substrate Integrated Waveguide (SIW) components and antennas in a polyethylene terephthalate (PET) substrate. PET is a cheap and flexible material, which represents an important candidate for the development of future conformal and wearable wireless systems.
2018 4th IEEE Conference on Network Softwarization and Workshops (NetSoft), 2018
There are several use cases that claim the need for a connected car. Among them there is the need... more There are several use cases that claim the need for a connected car. Among them there is the need for connectivity between vehicles and information sources, or V2V and V2X exchanges for accident prevention. In order to cope with the need for novel applications running on top of an interconnected network, the concept of fog computing appears as a realistic solution for both intra-car and inter-car data processing and decision making. This paper describes the proposed architecture and experimental evaluation of an innovative proof-of-concept (PoC) for a connected car, modeled with YANG, which can be remotely controlled using SDN/NFV and fog computing technologies. As an example, the remote control of the car might be based on a service application running on a fog node, which can be located close to a road side unit (RSU). We also propose a fog architecture in order to enable cooperative perception between connected cars. Finally, the performance evaluation uses a RESTCONF server installed in a Raspberry Pi aboard of a small car. This server is responsible for the sensors and actuators of the car and allows for its remote control from a user terminal (e.g., a smartphone, tablet, or laptop) and through the fog node, running a control application as a service.
IEEE INFOCOM 2019 - IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS), 2019
Mobile Edge Computing (MEC) is a key enabler for the deployment of vehicular use cases, as it gua... more Mobile Edge Computing (MEC) is a key enabler for the deployment of vehicular use cases, as it guarantees low latency and high bandwidth requirements. In this paper, we propose a MEC-based cooperative Collision Avoidance (MECAV) system designed to anticipate the detection and localization of road hazards. It includes a Collision Avoidance service, allocated in the MEC infrastructure, which receives information of status and detected hazards from vehicles, processes this information, and selectively informs to each vehicle that either approaches to road hazards or to other vehicles. We have implemented a proof-of-concept of the MECAV system and we have validated its architecture and functionalities.
AbstractA substrate integrated waveguide resonator (SIW) is used to design a push-push oscillato... more AbstractA substrate integrated waveguide resonator (SIW) is used to design a push-push oscillator. The SIW resonator presents a resonant mode at approximately half the output signal frequency. Due to the symmetry of the circuit architecture both an in-phase and an out of ...
Abstract This paper presents a compact, single substrate, active substrate integrated waveguide (... more Abstract This paper presents a compact, single substrate, active substrate integrated waveguide (SIW) cavity backed patch antenna oscillator. In the last years, the fast development of wireless communications spurred a great demand for low profile antennas. Cavity backed antennas have been widely studied as they offer several design advantages such as increased efficiency due to surface wave suppression, and adequate metal surface to dissipate heat from active devices. Additionally, cavity backed active oscillator antennas ...
A flexible electromagnetic (EM) / solar energy harvester is proposed that finds application in lo... more A flexible electromagnetic (EM) / solar energy harvester is proposed that finds application in low power energy autonomous wireless sensor networks and RFID-enabled sensors. A low cost, compact and conformal harvester is implemented on a flexible polyester (PET) substrate combining a rectenna for EM harvesting and a flexible amorphous silicon solar cell for solar energy harvesting. A compact design is achieved by placing the solar cell on top of the radiating element. A coplanar UWB monopole antenna is designed and a rectifying network is optimized using harmonic balance in order to maximize the rectenna efficiency for low power electromagnetic signals in the GSM-850 and GSM-1900 frequency bands. The solar cell is integrated on the surface of the UWB antenna and electromagnetic simulation is used to optimize its location and the required DC interconnects in order to minimize the performance degradation of the antenna. Measured results of the performance of the hybrid energy harvester are presented showing good agreement with simulation.
Abstract This paper presents an investigation of the fabrication tolerance in waveguide filters o... more Abstract This paper presents an investigation of the fabrication tolerance in waveguide filters operating at 30 GHz and implemented in Substrate Integrated Waveguide (SIW) technology. Millimeter-wave filters are getting more and more attention in the literature, as the interest towards applications in this frequency band grows. Moreover, SIW technology appears as a very promising candidate for the realization of planar, easy-to-integrate filters at these frequencies, as it combines low cost and flexibility of classical planar technologies ( ...
Abstract This work presents the design and implementation of a 927 MHz radio frequency beacon in ... more Abstract This work presents the design and implementation of a 927 MHz radio frequency beacon in coplanar waveguide technology, which scavenges through solar energy the power necessary for operation. Starting from a folded-slot antenna topology, a reflection-type oscillator is designed by combining full-wave and nonlinear analyses. Properly placed solar cells and a regulator are used to bias the device by scavenging solar energy from the environment. Prototypes have been implemented and measured. This low cost ...
2008 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, 2008
The multiple coexisting modes in triple-push circuits are studied using harmonic balance and cont... more The multiple coexisting modes in triple-push circuits are studied using harmonic balance and continuation methods. In order to utilize N-push circuits for power combination, the oscillating elements have to present a phase shift distribution of 2π π π π/N among them. However additional modes with different phase distributions usually coexist with the desired mode. In this work these multiple modes are obtained and their dependence with the coupling strength and phase at the first harmonic among the oscillating elements is studied. The results are verified using a prototype around 6GHz.
2010 IEEE Radio and Wireless Symposium (RWS), 2010
A compact dual polarized rectenna operating at 2.45 GHz is presented. It consists of a square ape... more A compact dual polarized rectenna operating at 2.45 GHz is presented. It consists of a square aperture coupled patch antenna with a cross shaped slot etched on its surface that permits a patch side reduction of 32.5%. The patch size is 3.4 cm by 3.4 cm. The antenna is dual linearly polarized with each orthogonal polarization received by an appropriately placed coupling slot. The received signal from each slot output is rectified by a voltage doubling circuit and the doubler DC output signals are combined allowing the rectenna receive signals of arbitrary polarization. The circuit is optimized for low input power densities using harmonic balance. Simulated rectifier maximum RF-to-DC conversion efficiency values of 15.7% and 42.1% were obtained for input available power levels of -20 dBm and -10dBm respectively at 2.45 GHz. The measured results are in agreement with the simulation.
We present a proposal of a quality model for natural language requirements that concentrates on l... more We present a proposal of a quality model for natural language requirements that concentrates on linguistic properties of requirements documents. We deploy the quality framework of Krogstie et al. as a superordinate rationale supporting the design of a quality model. At the same time, the quality model is intended to cover and classify the corpus of linguistic techniques proposed in the literature for the analysis of requirements. As a result, we have identi ed a number of factors and criteria that a ect the overall linguistic quality of requirements documents. Our model can thus be used to choose the most appropriate techniques to apply in order to reach a desired quality level.
This work presents a study of the use of substrate integrated waveguide (SIW) cavities in the des... more This work presents a study of the use of substrate integrated waveguide (SIW) cavities in the design of microwave oscillators and their effect on phase noise performance. Harmonic balance (HB) simulation and electromagnetic (EM) simulation are used to design a 12 GHz feedback oscillator and a 12 GHz reflection oscillator. Prototypes have been implemented and measured in order to investigate the effects of using different SIW cavities on the phase noise performance of oscillator circuits.
A compact, single substrate, active cavity backed slot antenna oscillator is presented whose cavi... more A compact, single substrate, active cavity backed slot antenna oscillator is presented whose cavity is implemented in Substrate Integrated Waveguide (SIW) technology. The cavity backed topology allows one to resolve potential heat dissipation problems in high power applications and array configurations, and may provide better phase noise performance. Combined EM simulation and harmonic balance analysis are used to design the radiating structure. Transient simulation is used to verify the stability of the steady state solutions. An X-band prototype was designed and fabricated. This compact, low cost antenna topology could be useful in radar and communication applications.
Abstract In this paper, substrate integrated waveguide (SIW) cavity-backed antennas and coupled ... more Abstract In this paper, substrate integrated waveguide (SIW) cavity-backed antennas and coupled oscillator systems are proposed. The cavity-backed structure permits to overcome potential problems such as heat dissipation and unwanted surface wave modes in large array ...
Abstract This paper presents the implementation of Substrate Integrated Waveguide (SIW) component... more Abstract This paper presents the implementation of Substrate Integrated Waveguide (SIW) components and antennas in a polyethylene terephthalate (PET) substrate. PET is a cheap and flexible material, which represents an important candidate for the development of future conformal and wearable wireless systems.
2012 42nd European Microwave Conference
Abstract This paper presents the implementation of Substrate Integrated Waveguide (SIW) component... more Abstract This paper presents the implementation of Substrate Integrated Waveguide (SIW) components and antennas in a polyethylene terephthalate (PET) substrate. PET is a cheap and flexible material, which represents an important candidate for the development of future conformal and wearable wireless systems.
2018 4th IEEE Conference on Network Softwarization and Workshops (NetSoft), 2018
There are several use cases that claim the need for a connected car. Among them there is the need... more There are several use cases that claim the need for a connected car. Among them there is the need for connectivity between vehicles and information sources, or V2V and V2X exchanges for accident prevention. In order to cope with the need for novel applications running on top of an interconnected network, the concept of fog computing appears as a realistic solution for both intra-car and inter-car data processing and decision making. This paper describes the proposed architecture and experimental evaluation of an innovative proof-of-concept (PoC) for a connected car, modeled with YANG, which can be remotely controlled using SDN/NFV and fog computing technologies. As an example, the remote control of the car might be based on a service application running on a fog node, which can be located close to a road side unit (RSU). We also propose a fog architecture in order to enable cooperative perception between connected cars. Finally, the performance evaluation uses a RESTCONF server installed in a Raspberry Pi aboard of a small car. This server is responsible for the sensors and actuators of the car and allows for its remote control from a user terminal (e.g., a smartphone, tablet, or laptop) and through the fog node, running a control application as a service.
IEEE INFOCOM 2019 - IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS), 2019
Mobile Edge Computing (MEC) is a key enabler for the deployment of vehicular use cases, as it gua... more Mobile Edge Computing (MEC) is a key enabler for the deployment of vehicular use cases, as it guarantees low latency and high bandwidth requirements. In this paper, we propose a MEC-based cooperative Collision Avoidance (MECAV) system designed to anticipate the detection and localization of road hazards. It includes a Collision Avoidance service, allocated in the MEC infrastructure, which receives information of status and detected hazards from vehicles, processes this information, and selectively informs to each vehicle that either approaches to road hazards or to other vehicles. We have implemented a proof-of-concept of the MECAV system and we have validated its architecture and functionalities.
AbstractA substrate integrated waveguide resonator (SIW) is used to design a push-push oscillato... more AbstractA substrate integrated waveguide resonator (SIW) is used to design a push-push oscillator. The SIW resonator presents a resonant mode at approximately half the output signal frequency. Due to the symmetry of the circuit architecture both an in-phase and an out of ...
Abstract This paper presents a compact, single substrate, active substrate integrated waveguide (... more Abstract This paper presents a compact, single substrate, active substrate integrated waveguide (SIW) cavity backed patch antenna oscillator. In the last years, the fast development of wireless communications spurred a great demand for low profile antennas. Cavity backed antennas have been widely studied as they offer several design advantages such as increased efficiency due to surface wave suppression, and adequate metal surface to dissipate heat from active devices. Additionally, cavity backed active oscillator antennas ...
A flexible electromagnetic (EM) / solar energy harvester is proposed that finds application in lo... more A flexible electromagnetic (EM) / solar energy harvester is proposed that finds application in low power energy autonomous wireless sensor networks and RFID-enabled sensors. A low cost, compact and conformal harvester is implemented on a flexible polyester (PET) substrate combining a rectenna for EM harvesting and a flexible amorphous silicon solar cell for solar energy harvesting. A compact design is achieved by placing the solar cell on top of the radiating element. A coplanar UWB monopole antenna is designed and a rectifying network is optimized using harmonic balance in order to maximize the rectenna efficiency for low power electromagnetic signals in the GSM-850 and GSM-1900 frequency bands. The solar cell is integrated on the surface of the UWB antenna and electromagnetic simulation is used to optimize its location and the required DC interconnects in order to minimize the performance degradation of the antenna. Measured results of the performance of the hybrid energy harvester are presented showing good agreement with simulation.
Abstract This paper presents an investigation of the fabrication tolerance in waveguide filters o... more Abstract This paper presents an investigation of the fabrication tolerance in waveguide filters operating at 30 GHz and implemented in Substrate Integrated Waveguide (SIW) technology. Millimeter-wave filters are getting more and more attention in the literature, as the interest towards applications in this frequency band grows. Moreover, SIW technology appears as a very promising candidate for the realization of planar, easy-to-integrate filters at these frequencies, as it combines low cost and flexibility of classical planar technologies ( ...
Abstract This work presents the design and implementation of a 927 MHz radio frequency beacon in ... more Abstract This work presents the design and implementation of a 927 MHz radio frequency beacon in coplanar waveguide technology, which scavenges through solar energy the power necessary for operation. Starting from a folded-slot antenna topology, a reflection-type oscillator is designed by combining full-wave and nonlinear analyses. Properly placed solar cells and a regulator are used to bias the device by scavenging solar energy from the environment. Prototypes have been implemented and measured. This low cost ...
2008 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, 2008
The multiple coexisting modes in triple-push circuits are studied using harmonic balance and cont... more The multiple coexisting modes in triple-push circuits are studied using harmonic balance and continuation methods. In order to utilize N-push circuits for power combination, the oscillating elements have to present a phase shift distribution of 2π π π π/N among them. However additional modes with different phase distributions usually coexist with the desired mode. In this work these multiple modes are obtained and their dependence with the coupling strength and phase at the first harmonic among the oscillating elements is studied. The results are verified using a prototype around 6GHz.
2010 IEEE Radio and Wireless Symposium (RWS), 2010
A compact dual polarized rectenna operating at 2.45 GHz is presented. It consists of a square ape... more A compact dual polarized rectenna operating at 2.45 GHz is presented. It consists of a square aperture coupled patch antenna with a cross shaped slot etched on its surface that permits a patch side reduction of 32.5%. The patch size is 3.4 cm by 3.4 cm. The antenna is dual linearly polarized with each orthogonal polarization received by an appropriately placed coupling slot. The received signal from each slot output is rectified by a voltage doubling circuit and the doubler DC output signals are combined allowing the rectenna receive signals of arbitrary polarization. The circuit is optimized for low input power densities using harmonic balance. Simulated rectifier maximum RF-to-DC conversion efficiency values of 15.7% and 42.1% were obtained for input available power levels of -20 dBm and -10dBm respectively at 2.45 GHz. The measured results are in agreement with the simulation.
We present a proposal of a quality model for natural language requirements that concentrates on l... more We present a proposal of a quality model for natural language requirements that concentrates on linguistic properties of requirements documents. We deploy the quality framework of Krogstie et al. as a superordinate rationale supporting the design of a quality model. At the same time, the quality model is intended to cover and classify the corpus of linguistic techniques proposed in the literature for the analysis of requirements. As a result, we have identi ed a number of factors and criteria that a ect the overall linguistic quality of requirements documents. Our model can thus be used to choose the most appropriate techniques to apply in order to reach a desired quality level.
This work presents a study of the use of substrate integrated waveguide (SIW) cavities in the des... more This work presents a study of the use of substrate integrated waveguide (SIW) cavities in the design of microwave oscillators and their effect on phase noise performance. Harmonic balance (HB) simulation and electromagnetic (EM) simulation are used to design a 12 GHz feedback oscillator and a 12 GHz reflection oscillator. Prototypes have been implemented and measured in order to investigate the effects of using different SIW cavities on the phase noise performance of oscillator circuits.
A compact, single substrate, active cavity backed slot antenna oscillator is presented whose cavi... more A compact, single substrate, active cavity backed slot antenna oscillator is presented whose cavity is implemented in Substrate Integrated Waveguide (SIW) technology. The cavity backed topology allows one to resolve potential heat dissipation problems in high power applications and array configurations, and may provide better phase noise performance. Combined EM simulation and harmonic balance analysis are used to design the radiating structure. Transient simulation is used to verify the stability of the steady state solutions. An X-band prototype was designed and fabricated. This compact, low cost antenna topology could be useful in radar and communication applications.
Abstract In this paper, substrate integrated waveguide (SIW) cavity-backed antennas and coupled ... more Abstract In this paper, substrate integrated waveguide (SIW) cavity-backed antennas and coupled oscillator systems are proposed. The cavity-backed structure permits to overcome potential problems such as heat dissipation and unwanted surface wave modes in large array ...
Abstract This paper presents the implementation of Substrate Integrated Waveguide (SIW) component... more Abstract This paper presents the implementation of Substrate Integrated Waveguide (SIW) components and antennas in a polyethylene terephthalate (PET) substrate. PET is a cheap and flexible material, which represents an important candidate for the development of future conformal and wearable wireless systems.