scispace - formally typeset
Search or ask a question
Author

Bruno Piovano

Bio: Bruno Piovano is an academic researcher from Telecom Italia. The author has contributed to research in topics: Directional antenna & Microstrip antenna. The author has an hindex of 5, co-authored 12 publications receiving 185 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the design and optimization of a new polarizer structure realized in circular waveguide with insertion of elliptical irises is described, showing a considerable reduction in size and weight when compared to previously known realizations.
Abstract: We describe the design and optimization of a new polarizer structure realized in circular waveguide with insertion of elliptical irises. The device is compact, showing a considerable reduction in size and weight when compared to previously known realizations. It requires manufacturing by milling techniques only and, since it is composed entirely by waveguides with separable cross sections, it is also well suited for electromagnetic modeling. Measured and theoretical results for a polarizer with a 90/spl deg//spl plusmn/1/spl deg/ differential phase shift and a return loss better than 35 dB for both polarizations over the operating frequency band confirm the validity of the proposed design.

67 citations

Journal ArticleDOI
TL;DR: In this article, a hybrid computer-aided design technique, which employs the standard generalized scattering matrix description and a new method, based on the three-dimensional generalized admittance matrix representation, for the efficient and reliable analysis of compact ortho-mode transducers (OMT).
Abstract: We describe a hybrid computer-aided-design technique, which employs the standard generalized scattering matrix description and a new method, based on the three-dimensional generalized admittance matrix representation, for the efficient and reliable analysis of compact ortho-mode transducers (OMT). A rigorous investigation of the numerical convergence properties of the electromagnetic simulators is carried out by using as a benchmark the measurements of a specifically built structure. The electromagnetic simulators are used for the efficient computer-aided optimization of the OMT and a procedure for the dynamical optimization of such components is introduced and tested by designing several OMT's operating at L, S, and Ku frequency bands. The component design, entirely carried out at computer level, has demonstrated significant advantages in terms of development times and no need of post-manufacturing adjustments. The very satisfactory agreement between experimental and theoretical results further confirms the validity of the proposed technique.

62 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented a novel switched beam antenna (SBA) consisting of four identical metamaterial-inspired electrically short printed monopoles, vertically placed at the corners of a grounded square board.
Abstract: We present a novel switched beam antenna (SBA) consisting of four identical metamaterial-inspired electrically short printed monopoles, vertically placed at the corners of a grounded square board. The antenna is designed to operate in the frequency range 1600-2700 MHz, with global dimensions 120 mm × 120 mm × 30 mm. The SBA has been first numerically simulated and optimized and, then, fabricated and tested. Numerical and experimental results show a good agreement. The obtained switched beam capabilities, the achieved realized gain levels, and the synthesized radiation pattern shapes on the horizontal plane, make the proposed SBA a good candidate as a radiating element of a receiving module for wireless telecommunication systems (DCS, UMTS, Wi-Fi, LTE) in areas with reduced signal coverage and/or high interference levels.

20 citations

Patent
29 Mar 2012
TL;DR: In this article, an antenna device (10, 40, 60) comprising of a first antenna assembly (1 1, 41, 62) configured to receive first radiofrequency signals polarized according to a first polarization, and a second antenna assembly configured according to second polarization orthogonal to the first polarization was presented.
Abstract: Disclosed herein is an antenna device (10, 40, 60) comprising: a first antenna assembly (1 1, 41, 62) configured to receive first radiofrequency signals polarized according to a first polarization; a second antenna assembly (1 2, 42, 65) configured to receive second radiofrequency signals polarized according to a second polarization orthogonal to the first polarization; and a radiofrequency signal handling assembly coupled with the first (1 1, 41, 62) and second (12, 42, 65) antenna assemblies, and configured to handle the received first radiofrequency signals separately from the received second radiofrequency signals.

19 citations

Journal ArticleDOI
TL;DR: In this paper, the definitions of EMF zones and the zone's boundaries around an antenna are revised and tailored for the evaluation of human exposure to the EMFs, and the space around the antenna is sectioned into three regions: reactive, radiating near field, and far field.
Abstract: The regulatory framework on human exposure to electromagnetic fields (EMFs) is a crucial task that the telecommunication operators and the authorities have to face. Some procedures have been introduced in standards, based on both computations and measurements, for the assessment of the compliance of the radio transmitters to the given EMF limits. The procedures could vary depending on the position of the observation point around the transmitting antennas. In this article, the definitions of EMF zones and the zone's boundaries around an antenna are revised and tailored for the evaluation of human exposure to the EMFs. The space around the antenna is sectioned into three regions: reactive, radiating near field, and far field. The analytical and numerical results are used to support the proposed region's boundaries. Some examples of region boundaries are given for a few antenna types.

18 citations


Cited by
More filters
Journal ArticleDOI
18 May 2015
TL;DR: This paper is aimed at reviewing the latest advances on reconfigurable metamaterial engineering from the methodological perspective also providing a comprehensive and balanced survey on latest concepts, current trends, and envisaged future developments on this active field of research.
Abstract: The introduction of electromagnetic (EM) media with unique field manipulation properties, collectively labelled as metamaterials, has boosted the interest toward the design, the fabrication, and the testing of artificial materials whose features can be engineered according to the applicative requirements and user objectives. In this framework, the long-term promise of reconfigurable metamaterial theory (i.e., the possibility to change the EM response of a 2-D/3-D material arbitrarily and in real time) has given the designers an extremely wide number of new degrees of freedom for the synthesis of innovative adaptive systems. Moreover, successful experimental validations of reconfigurable metamaterials in the entire EM spectrum from microwaves to optical frequencies have further stimulated academic and industrial interests in developing devices with enhanced performances, efficiency, and robustness. Nevertheless, the exploitation of reconfigurable metamaterials in commercial devices is still an open problem with several challenges from both the theoretical and technological viewpoints. This paper is then aimed at reviewing the latest advances on reconfigurable metamaterial engineering from the methodological perspective also providing a comprehensive and balanced survey on latest concepts, current trends, and envisaged future developments on this active field of research.

152 citations

Journal ArticleDOI
TL;DR: In this paper, a review of recent advances in three-dimensional frequency-selective structures is presented, and a number of related research topics for future exploration are also discussed and discussed.
Abstract: Three-dimensional (3-D) frequency-selective structures are a recent development that exhibit superior filtering responses compared to conventional two-dimensional (2-D) frequency-selective surfaces. A three-dimensional frequency-selective structure typically comprises a two-dimensional periodic array of multimode cavities the modes of which and the coupling of which with air can be controlled to obtain a desired frequency response. Based on their distinct configuration, we seek to classify them as a separate class of high-performance frequency-selective structures, and to highlight their unique features in this paper. We also present a review of recent advances in three-dimensional frequency-selective structures, and suggest a number of related research topics for future exploration.

142 citations

Journal ArticleDOI
TL;DR: In this paper, a 4 × 4 substrate integrated waveguide (SIW)-fed circularly polarized (CP) antenna array with a broad axial-ratio (AR) bandwidth is designed and fabricated by multilayer printed circuit board (PCB) technology.
Abstract: In this letter, a 4 ×4 substrate integrated waveguide (SIW)-fed circularly polarized (CP) antenna array with a broad axial-ratio (AR) bandwidth is designed and fabricated by multilayer printed circuit board (PCB) technology. The antenna array consists of 16 sequentially rotated elliptical cavities fed by slots on the SIW acting as the radiating elements, four 1-to-4 SIW power dividers, and a transition from a coaxial cable to the SIW. The widened AR bandwidth of the antenna array is achieved by using an improved SIW power divider. The antenna prototype was fabricated and measured, and the discrepancies between simulations and measurements are carefully analyzed.

75 citations

Journal ArticleDOI
TL;DR: In this article, the design and optimization of a new polarizer structure realized in circular waveguide with insertion of elliptical irises is described, showing a considerable reduction in size and weight when compared to previously known realizations.
Abstract: We describe the design and optimization of a new polarizer structure realized in circular waveguide with insertion of elliptical irises. The device is compact, showing a considerable reduction in size and weight when compared to previously known realizations. It requires manufacturing by milling techniques only and, since it is composed entirely by waveguides with separable cross sections, it is also well suited for electromagnetic modeling. Measured and theoretical results for a polarizer with a 90/spl deg//spl plusmn/1/spl deg/ differential phase shift and a return loss better than 35 dB for both polarizations over the operating frequency band confirm the validity of the proposed design.

67 citations

Journal ArticleDOI
TL;DR: In this article, a coplanar waveguide (CPW)-fed dual-band antenna operating at linear and circular polarization is presented, where a right/left-handed unit cell is designed as a radiation element that can provide zerothmode resonance and positive-mode resonance at the lower and upper frequency.
Abstract: A coplanar waveguide (CPW)-fed dual-band antenna operating at linear and circular polarization is presented in this letter. A novel composite right/left-handed (CRLH) unit cell is designed as a radiation element that can provide zeroth-mode resonance and positive-mode resonance at the lower and upper frequency. A TM01 mode orthogonal to +1st-Order is excited by a square complementary split-ring resonator (S-CSRR) in order to form a circular polarization. The equivalent circuit model is applied to analyze and design the CRLH unit cell. The antenna has a linearly polarized slot-like radiation characteristic at the lower frequency and a circularly polarized patch-like radiation characteristic at the upper frequency. Also, the total electrical size of the fabricated dual-band antenna employing a single unit cell was 0.14λ0 ×0.16λ0 ×0.01λ0 at the lower frequency. Simulation and experimental results are used to verify the theoretical prediction .

63 citations