Results 281 to 290 of about 758,632 (333)
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IEEE Communications Magazine, 2004
Ultra wideband antennas are specifically designed to transmit and/or receive very short time durations of electromagnetic energy. It is well known that UWB antenna design remains the major factor in the progress of UWB technology. This article describes a study of conventional antennas and why they are not suitable for a UWB system.
K.Y. Yazdandoost, R. Kohno
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Ultra wideband antennas are specifically designed to transmit and/or receive very short time durations of electromagnetic energy. It is well known that UWB antenna design remains the major factor in the progress of UWB technology. This article describes a study of conventional antennas and why they are not suitable for a UWB system.
K.Y. Yazdandoost, R. Kohno
openaire +1 more source
Ultra-wideband solar absorber based on refractory titanium metal
Renewable Energy, 2020Electromagnetic wave absorbers with very long absorption spectra have become an important target for optoelectronic materials and technology. In this paper, we propose a titan-based resonator to achieve near-perfect wide spectrum absorption of solar ...
Peiqi Yu +7 more
semanticscholar +1 more source
2018
In this chapter, we focus on these modern challenges faced by wideband array designers, and the substantial advancements which have been made over the past 5 years. Initially, we provide a review of UWB array designs to familiarize the reader with the two most common groups of UWB arrays.
Markus H. Novak, John L. Volakis
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In this chapter, we focus on these modern challenges faced by wideband array designers, and the substantial advancements which have been made over the past 5 years. Initially, we provide a review of UWB array designs to familiarize the reader with the two most common groups of UWB arrays.
Markus H. Novak, John L. Volakis
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A Three-Dimensional Design of Ultra-Wideband Microwave Absorbers
IEEE transactions on microwave theory and techniques, 2020A three-dimensional (3-D) structure is proposed in this article for ultra-wideband absorber design. The ultra-wideband absorber is implemented by properly combining two subabsorbers.
G. Luo +4 more
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Ultra-Wideband WDM Transmission in S-, C-, and L-Bands Using Signal Power Optimization Scheme
Journal of Lightwave Technology, 2019Ultra-wideband (UWB) wavelength division multiplexed (WDM) transmission using high-order modulation formats is one of the key techniques to expand the transmission capacity per optical fiber.
F. Hamaoka +7 more
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Metasurface Lens for Ultra-Wideband Planar Antenna
IEEE Transactions on Antennas and Propagation, 2020In this article, an ultra-wideband metasurface lens is designed and integrated into an antipodal Vivaldi antenna (AVA) to improve its radiation directivity without affecting its efficiency and return loss characteristics. The metasurface lens consists of
O. Yesilyurt, G. Turhan‐Sayan
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Ultra-wideband far-infrared absorber based on anisotropically etched doped silicon.
Optics Letters, 2020Far-infrared absorbers exhibiting wideband performance are in great demand in numerous applications, including imaging, detection, and wireless communications. Here, a nonresonant far-infrared absorber with ultra-wideband operation is proposed.
Xiaolong You +6 more
semanticscholar +1 more source
IEEE International Symposium on Phased Array Systems and Technology, 2003., 2004
There is a need for ultra-wideband phased arrays for military applications such as multifunction, EW, and ESM systems. This need was addressed on the DARPA reconfigurable aperture (RECAP) program, with a goal of a 10:1 bandwidth array aperture. Previous aperture designs covered 3 or 5:1 bandwidths [Hemmi, C, et al., March 1999, Chio, T.H., et al., Sept.
R.T. Dover +3 more
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There is a need for ultra-wideband phased arrays for military applications such as multifunction, EW, and ESM systems. This need was addressed on the DARPA reconfigurable aperture (RECAP) program, with a goal of a 10:1 bandwidth array aperture. Previous aperture designs covered 3 or 5:1 bandwidths [Hemmi, C, et al., March 1999, Chio, T.H., et al., Sept.
R.T. Dover +3 more
openaire +1 more source
Compact wearable MIMO antenna with improved port isolation for ultra‐wideband applications
IET Microwaves, Antennas & Propagation, 2019In this communication, a compact two-element ultra-wideband (UWB) wearable multiple-input multiple-output (MIMO) antenna with high port isolation is presented.
Ashim Kumar Biswas, U. Chakraborty
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, 2020
In this work, a polarization conversion metasurface is proposed, which can convert linearly polarized electromagnetic (EM) waves into cross-polarized waves in ultra-wideband at high polarization conversion efficiency. The proposed sandwiched metasurface,
Chuan Liu +3 more
semanticscholar +1 more source
In this work, a polarization conversion metasurface is proposed, which can convert linearly polarized electromagnetic (EM) waves into cross-polarized waves in ultra-wideband at high polarization conversion efficiency. The proposed sandwiched metasurface,
Chuan Liu +3 more
semanticscholar +1 more source