49 research outputs found
Polarization reconfigurable patch antenna for compact and low cost UHF RFID reader
No full textThis paper presents a patch antenna designed for Ultra High Frequency (UHF) Radio Frequency IDentification (RFID) reader including a reconfigurable feeding for achieving polarization agility. The switchable polarization improves the polarization efficiency in comparison with standard circular polarized antenna solutions. CMOS switches are used in the reconfigurable feeding network for enabling higher power transmission and uncomplicated control with respect to solutions involving varactors and PIN diodes. Moreover, the designed patch antenna and ground planes have reduced size, for best integration of the reader in the required application. The combination of antenna and reconfigurable feeding network has been tested through simulations, showing good performance over the EU RFID frequency band (865-868 MHz). Due to its flexible and inexpensive structure, the proposed reconfigurable feeding system is a promising alternative to standard circular polarized reader antenna approaches
Reconfigurable Antennas and Systems
No full textL'abstract è presente nell'allegato / the abstract is in the attachmen
Phase management for extended scan range antenna arrays based on Rotman lens
No full textThis paper presents an implementation of a technique aimed to double the scanning range of a 24 GHz array antenna system
based on Rotman lens beamforming. The new concept of the enhanced beam forming network consists of a combination of Rotman lens and
1-bit phase shifters, positioned in a peculiar way on the array side of the lens, and together with a particular beam arrangement allows to
overcome the scan limitations which is typical of the standalone Rotman lens solution. Simulations will demonstrate that a Rotman
lens, designed to steer the beam up to ±30°, when arranged in combination with properly designed Ratrace based phase shifters, allows to increase the scan range up to ±60°
Flexible and cost effective reconfigurable UHF RFID antenna system
No full textIn this paper a reconfigurable matching network for achieving frequency agility of an electrically small UHF RFID patch antenna is proposed. In order to allow switching under high power transmission a state-of-the-art SP3T CMOS switch is employed for selecting specific components and thus achieving a proper matching in the EU and US frequency bands. Moreover, in the proposed design, only one switch is used instead of four needed in standard aperture tuning approaches. An optimized design of a RFID microstrip antenna has been simulated, showing good performance and high degree of flexibility of this technique, which for its low cost and high integration rate, can become an alternative to aperture tuning for frequency agility purposes
Phase Shifters Design for Scan Range Extension of Rotman Lens Beamforming Based Antenna Arrays
No full textThe design of the phase management unit needed for extending the scan range of a 24 GHz array antenna system based on Rotman lens beamforming is presented. The developed phase management unit consists of both static and switchable reflective type phase shifters, whose particular arrangement, in combination with a Rotman lens, allows increasing the maximum steering beam angle by 100%. Finally, the proposed concept is validated through simulation including the complete beamforming network and antenna array system
Frequency and Polarization Agile RFID Patch Antenna with Reduced Dimensions
No full textThis paper presents a frequency and polarization reconfigurable UHF RFID patch antenna based on a switchable feeding network. For best integration of the antenna, its size and ground plane are much smaller with respect to the canonical patch antenna design, however the proposed design is able to cover the EU and US frequency bands of the RFID standard. State-of-the-art CMOS switches are employed as key element for selecting the desired polarization and proper matching network. The switches provide also a simple solution for high power applications in contrast to concepts based on PIN diodes or varactors. Simulated results have shown good performance. Considering its flexible and inexpensive structure, the proposed system is a promising alternative to aperture tuning and circular polarized antenna approaches
Ownership vs stewardship: Toward a practice-based model of value capture in open innovation
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Ownership vs stewardship: Toward a practice-based model of value capture in open innovation
No full text
