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The far field pattern from a non-uniformly spaced antenna array is computed using a least squares method. The method originally developed for spectral estimation for a non-uniformly spaced finite data set is applied for the analysis of the far field pattern from unevenly spaced antennas, as the far field pattern is due to the spectrum of the location of the antenna elements. The advantage of using...
This presentation focuses on the design and characterization process of an active array demonstrator for the mid-frequency range (i.e., 300 MHz-1000 MHz) of the future Square Kilometre Array (SKA) radio telescope. This demonstrator, called FIDA3 (FG-IGN: Fundación General Instituto Geográfico Nacional — Differential Active Antenna Array), is part of the Spanish contribution to the SKA project. The...
Maxwell's equations have been around for over 150 years since its inception. But due to their enduring legacy, their importance has not diminished over the years. In fact, electromagnetic theory finds applications in increasing number of areas and relationship to deeper mathematics. For instance, electromagnetics is important for quantum information, quantum optics, and increasingly being used in...
I will discuss low-frequency radio astronomy engineering efforts underway in Western Australia. We carry out this work through the International Centre for Radio Astronomy Research (ICRAR)/Curtin University. The frequency range of interest is ∼50 to ∼350 MHz, which is the Low-Frequency Square Kilometre Array (SKA-Low) frequency band. I will describe recent and current work in the Murchison Widefield...
Plenary Talk. — The next frontier of nanophotonics research is to develop metamaterials with on-demand optical properties that may be independently controlled at any given point in space and at any moment of time. We will overview emerging technologies for meta-molecular level switching controlled by electric or magnetic signals and with light.
This is an IEEE Distinguished Lecture from Antennas and Propagation Society. Since the discovery of efficient leaky-wave radiation from a slot in a wave guide by Oliner, leaky-wave antennas have attracted a lot of interest in applications that require beam scanning. Printed planar configurations of LWAs have become very popular, due to low cost. Half-width LWAs based on microstrip lines and substrate-integrated-wave...
In this tutorial, the following topics will be covered. • The early history of antenna development will be briefly introduced. • Three important and innovative antennas will be highlighted and they include Yagi-Uda antenna, slot antenna, and microstrip antenna. • Basic considerations of antenna design will be provided. • Recent developments, such as design of small antennas, implanted antennas, multiple...
Beam steering antennas are widely used both in radar and communications applications for their ability to form arbitrary beam patterns in real time with superior speed compared to their mechanically gimbaled counterparts. In this talk, design and development of some novel phased arrays and anti-jamming antennas will be discussed which are completed at the Antenna and Microwave Lab (AML), San Diego...
In this paper, wideband and ultra wideband (UWB) radio propagation within a small aircraft was measured and statistically analyzed. Wideband including UWB wireless technology has been considered for replacing wire harnesses used in aircrafts, spacecraft, and other closed-or semi-closed spaces because of its anti-multipath capabilities and possible low power consumption. Adaptation of wireless technologies...
Broadcast television is one of the most important telecommunication systems in Brazil. Such relevance requires that an assessment of the coverage and quality of the Digital TV signal must be extensively performed in the pursuit of technical excellence. The study of coverage prediction models would allow broadcasters to project their stations in a way to distribute their respective signals harmoniously...
In this paper a dual-band antenna consisting of a double-ridged horn and a low-profile top-hat monopole, is introduced for unmanned aerial vehicle (UAV) applications. The horn is operating on a broad band from 2 GHz to 5.9 GHz with high gain in the bore sight direction to support high-speed data transmission; the low-profile top-hat monopole operates at a low frequency band from 430MHz to 450MHz and...
This work presents the station distribution for a radio interferometer with 192 dipole antennas. The general configuration is optimized for best detecting performances, reaching a sensitivity of 52 mJy for 1 hour observations.
This paper presents a brief analysis of the existing methods of reducing microstrip device dimensions. This paper also presents a miniaturization method based on using artificial transmission lines, which possess characteristics similar to those of quarter-wave transmission lines. Based on this method, a compact directional coupler, which divides the power in a 1:2 ratio, was designed and manufactured...
This paper proposes a very simple analytical formula for the magnetic field arising from single-circuit twisted three-phase cables as a tool to diagnose faults. Indeed, in the presence of cable faults the magnetic field around these cables increases dramatically. Then, by calculating the field with the formula using the current measured on one phase and by comparing the calculated and the measured...
The X-parameter model is designed for modeling weakly nonlinear devices in an approximately impedance-matched environment. Load dependent X-parameter models were proposed to overcome this, practically very relevant, limitation and model a nonlinear device in a highly mismatched environment. However, the applicability of load dependent X-parameter models for DUTs operating in deep saturation like in...
The aim of this contribution is the study of a multi-view electromagnetic scanner. In this system, the final image is dynamically built from several partial images taken from arbitrary views. Thus, the system opens the possibility to produce the surface profiling of an entire target without suffering shadow effects due to occlusions.
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