Results 31 to 40 of about 630,146 (307)
International Journal of Antennas and Propagation, 2021 Electronically controlled antenna arrays, such as reconfigurable and phased antenna arrays, are essential elements of high-frequency 5G communication hardware.
Stanislav Ogurtsov +2 more
doaj +1 more source
Performance Limits of Fluid Antenna Systems [PDF]
, 2020 Fluid antenna represents a concept where a mechanically flexible antenna can switch its location freely within a given space. Recently, it has been reported that even with a tiny space, a single-antenna fluid antenna system (FAS) can outperform an L ...
Shojaeifard, Arman +3 more
core +1 more source
Wideband Circularly Polarized Ellipse Antenna Array with Gain Enhancement
International Journal of Antennas and Propagation, 2018 In this paper, a wideband circularly polarized (CP) antenna element and array with gain enhancement are presented. The original antenna element adopts two orthogonal ellipse dipoles with end-loading pillars. In order to achieve a wide impedance bandwidth
Li Wang +5 more
doaj +1 more source
Frequency selective lens antenna [PDF]
, 2007 A variant of the hemispherical microwave lens antenna is reported where the ground plane region is modified through use of a frequency selective surface. This allows discrimination of frequencies by two closely spaced primary feeds.
Haines, P., Thornton, J.
core +1 more source
Pediatric Blood &Cancer, EarlyView.ABSTRACT Asymptomatic infection poses a significant risk for children undergoing hematopoietic stem cell transplantation (HSCT). Pre‐transplant surveillance computed tomography (CT) is commonly used to identify occult infection, though its diagnostic yield remains uncertain.
Tyler Obermark +9 more
wiley +1 more source
Study on High Performance of MPI-Based Parallel FDTD from WorkStation to Super Computer Platform
International Journal of Antennas and Propagation, 2012 Parallel FDTD method is applied to analyze the electromagnetic problems of the electrically large targets on super computer. It is well known that the more the number of processors the less computing time consumed.
Z. L. He +4 more
doaj +1 more source
A Novel Resource Allocation Scheme in NOMA-Based Cellular Network with D2D Communications
Future Internet, 2020 Non-orthogonal multiple access (NOMA) has become a promising technology for 5G. With the support of effective resource allocation algorithms, it can improve the spectrum resource utilization and system throughput.
Jingpu Wang, Xin Song, Yatao Ma
doaj +1 more source
Combined Single-Layer K-Band Transmitarray and Beamforming S-Band Antenna Array for Satcom
IEEE Open Journal of Antennas and Propagation, 2022 In this paper, a dual-band antenna at 4.5 GHz and 25 GHz is presented. The antenna is a low-frequency phased patch antenna array combined with a high-frequency transmitarray with a fixed beam.
Daniel Edelgaard Serup +2 more
doaj +1 more source
UHF SATCOM broadband CP antenna: moxon type bent-dipoles over a ground plane [PDF]
, 2011 In this paper, we investigate and compare two different antenna types for UHF SATCOM applications; proposed Moxon type (bent dipole) and conventional egg beater (loop) antennas in terms of antenna performance and physical size. Bent dipole and egg beater
Niver, Edip +2 more
core
Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM
FEBS Letters, EarlyView.Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley +1 more source