Results 51 to 60 of about 3,021 (195)
An ohmic RF MEMS switch for reconfigurable microstrip array antennas built on PCB [PDF]
, 2008 This paper presents the analysis, design and simulation of an ohmic RF MEMS switch specified for reconfigurable microstrip array antennas built on PCB via an integrated monolithic technology.
Charalampidis, N +6 more
core
An absorption profile centred at 78 megahertz in the sky-averaged spectrum
, 2018 After stars formed in the early Universe, their ultraviolet light is expected, eventually, to have penetrated the primordial hydrogen gas and altered the excitation state of its 21-centimetre hyperfine line.
Bowman, Judd D. +4 more
core +1 more source
Nested Horn‐Based 3D‐Printed Dual‐Band High‐Gain Conical Beam Antenna
IET Microwaves, Antennas &Propagation, Volume 19, Issue 1, January/December 2025.The proposed antenna is committed to simultaneously possess dual‐band, high‐gain, wideband and conical beam performances. The design of the nested horn and the impedance change caused by the ridge waveguide can provide a simple and easy‐to‐implement idea for dual‐band wideband antenna design. Meanwhile, the loading of dual reflectors not only increases
Li Wu +4 more
wiley +1 more source
IET Microwaves, Antennas & Propagation, 2021 Here, the authors calculate the fields due to the electric dipole that excites a homogenized metasurface which is printed on a finite thickness dielectric slab. The problem is solved by replacing the total parts below the periodic array which contain the
A. Azari, Z.H. Firouzeh, A. Bakhtafrouz
doaj +1 more source
, 2017 We report constraints on the global $21$ cm signal due to neutral hydrogen at redshifts $14.8 \geq z \geq 6.5$. We derive our constraints from low foreground observations of the average sky brightness spectrum conducted with the EDGES High-Band ...
Bowman, Judd D. +3 more
core +1 more source
Optimizing Processing Time of Radio-Astronomy Antenna Simulations Using FEKO
Applied Computational Electromagnetics Society, 2020 The far-field pattern of a geometrically large and complex antenna used in low-frequency radio astronomy is computationally expensive to simulate on electromagnetic simulators, such as FEKO. For example, one station of the Square Kilometer Array, which consists of 256 log-periodic antenna elements, will take years to simulate using the full CAD model ...
Steiner, Rowanne +6 more
openaire +1 more source
IET Microwaves, Antennas &Propagation, Volume 19, Issue 1, January/December 2025.In this paper, we propose a three‐dimensional integral equation‐based GSTC solver for the electromagnetic analysis of metasurface composite structures. We present a novel numerical method, focusing on the rigorous enforcement of boundary conditions at the interfaces, a critical aspect in the problem formulation for composite structures.
Inhwan Kim +5 more
wiley +1 more source
A Flexible K‐Band FMCW Radar Prototype for Low‐RCS Nano‐Drone Detection
IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.A 5‐cm nano drone with its Doppler signature. ABSTRACT Nano‐drones are insect‐like drones used to provide intelligence through their capability of intrusion and ability to carry small sensors. They pose a defence and security threat and can potentially violate secure establishments and privacy rights.
Safiah Zulkifli, Alessio Balleri
wiley +1 more source
Source Reconstruction Method Based Radiated Emission Characterization for PCBs [PDF]
, 2013 published_or_final_versio
Jiang, L, LI, P
core +2 more sources
Multi‐Shot Estimation of Resonance Parameters of Late‐Time Radar Returns in Clutter
IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.A technique for estimating the resonant features of radar targets based on their late‐time returns (LTRs) is presented. Experimental results demonstrate that the technique is effective in scenarios where the target is embedded in significant clutter, and the signal‐to‐noise ratio in the LTRs is quite low.
Mihail S. Georgiev +2 more
wiley +1 more source