1,721,145 research outputs found
sj-xlsx-2-foi-10.1177_00145858231190030 - Supplemental material for Geographical maps meet place names where languages meet dialects: The case of Italian
No full textSupplemental material, sj-xlsx-2-foi-10.1177_00145858231190030 for Geographical maps meet place names where languages meet dialects: The case of Italian by Giuseppe Samo and Francesco-Alessio Ursini in Forum Italicum</p
sj-rar-3-foi-10.1177_00145858231190030 - Supplemental material for Geographical maps meet place names where languages meet dialects: The case of Italian
No full textSupplemental material, sj-rar-3-foi-10.1177_00145858231190030 for Geographical maps meet place names where languages meet dialects: The case of Italian by Giuseppe Samo and Francesco-Alessio Ursini in Forum Italicum</p
sj-txt-4-foi-10.1177_00145858231190030 - Supplemental material for Geographical maps meet place names where languages meet dialects: The case of Italian
No full textSupplemental material, sj-txt-4-foi-10.1177_00145858231190030 for Geographical maps meet place names where languages meet dialects: The case of Italian by Giuseppe Samo and Francesco-Alessio Ursini in Forum Italicum</p
sj-txt-1-foi-10.1177_00145858231190030 - Supplemental material for Geographical maps meet place names where languages meet dialects: The case of Italian
No full textSupplemental material, sj-txt-1-foi-10.1177_00145858231190030 for Geographical maps meet place names where languages meet dialects: The case of Italian by Giuseppe Samo and Francesco-Alessio Ursini in Forum Italicum</p
Excitation of multiple characteristic modes on a three dimensional platform
No full textThis work is a preliminary investigation of the possibility to excite a set of characteristic modes on a three dimensional object. The aim of this study is to provide guidelines for the excitation of characteristic modes on a complex platform in order to obtain a pattern reconfigurabl
Characteristic Modes Analysis of a Near-Field Polarization-Conversion Metasurface for the Design of a Wideband Circularly Polarized X-Band Antenna
Get PDFA metasurface (MS) based on loop elements operating in the near field of a linearly-polarized microstrip antenna is employed to realize a circularly polarized radiated field. The properties of the loop unit cell are highlighted with the help of the Characteristic Mode Analysis that is employed for investigating the achievable linear to circular polarization conversion bandwidth and providing the guidelines for the design of the final antenna. A finite structure comprising 4×4 unit cells is tailored for achieving a circularly polarized far field within the whole X-band adopted for satellite communications (7.25 GHz-7.75 GHz, 7.9 GHz-8.4 GHz). A simple but effective single-port excitation scheme is adopted, and the overall performance are assessed by measurements on the fabricated prototype. The good agreement between simulated and measured results confirms the reliability of the proposed approach as well as the meaningful insight provided by Characteristic Modes Theory
Low Profile Dielectric Transmitarray Based on Additive Manufacturing Technology
No full textA preliminary study concerning the possibility to exploit Additive Manufacturing (AM) technologies for the fabrication of a transmitarray (TA) is addressed. More in detail, dielectric unit cells are tailored to alter the phase profile of a TA panel operating at 30 GHz
Characteristic Modes Analysis of Non-Uniform Metasurface Superstrate for Nanosatellite Antenna Design
No full textThis work addresses the use of the Characteristic Modes Analysis (CMA) for tailoring a
Metasurface (MTS) in view of exploiting it in compact, low-profile, Circularly Polarized (CP) antennas. The
investigated non-uniform MTS is exploited as a superstrate in the design of a novel compact and low-profile
antenna for nanosatellite applications. The MTS consists of a 3 x 4 array of unequal patches arranged in a
rectangular lattice. The antenna parameters are carefully tailored by using the CMA to achieve a significant
performance enhancement with respect to a uniform MTS in terms of both Axial Ratio (AR) bandwidth and
aperture efficiency. The reliability of the CMA approach is verified by assessing the overall performance
of the whole radiating structure comprising the stripline feeding excitation. The proposed MTS antenna is
compact (0.068 lambda0) provides a remarkable aperture efficiency going from 86 % up to 96 % and an AR
coverage in the upper hemisphere greater than 84 % within the desired S-band (2.025 - 2.29 GHz)
Penrose Tiling Subarrays Exploiting Mixed Antenna Element Factors for Large-Scanning Phased Arrays
No full textMultiple characteristic modes excitation for pattern reconfigurable antennas design
No full textThe study of the Characteristic Modes (CMs) on a square conductive plane has been addressed to design a pattern reconfigurable antenna. More in detail, it is demonstrated that an efficient stimulation of suitable current modes distribution (Jn) by a proper placing of capacitive exciters over the square plate is able to provide a pattern reconfigurable capability. In particular, the positioning of the capacitive coupling exciters (CCEs) allows stimulating three current modes, whose modal excitation degree can be easily controlled. An appropriate phase shifting between the CCEs enables to control the modal excitation coefficient of the current modes, allowing the pattern reconfigurability
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