Results 41 to 50 of about 149,488 (210)

Switchable filtering in Vivaldi antenna

Electronics Letters, 2010
Presented is a new frequency switchable Vivaldi antenna that has a capability to operate in a wideband mode (1-3 GHz) and reconfigure to six different subbands of operations. The reconfiguration is realised by coupling and changing the effective electrical length of ring slots inserted in the structure by means of pin diode switches. To examine antenna
Hamid, Mohamad Rijal, Hall, P. S., Gardner, P., Ghanem, F.   +3 more
openaire   +2 more sources

Gain and Bandwidth Enhancement of a Metamaterial Loaded Antipodal Vivaldi Antenna Fed by Substrate Integrated Waveguide [PDF]

Radioengineering, 2022
This paper proposes a novel wideband, high-gain, compact Vivaldi antenna operating in the 14.7-20.5 GHz frequency range, where the antenna is fed by the substrate integrated waveguide (SIW). A Negative Index Metamaterial (NIM) has been designed, with its
A. Bordbar, F. Mohajeri, Z. Ghorbani
doaj  

Frequency-Dependent Feeding Methods for Broadband Vivaldi Arrays With Minimum Half-Power Beamwidth (HPBW) Variation

IEEE Open Journal of Antennas and Propagation, 2021
This paper reports on the design of frequency-dependent feed networks for linear antenna arrays with minimum half-power beamwidth (HPBW) variation in more than one octave of the frequency spectrum.
Dakotah J. Simpson, Dimitra Psychogiou
doaj   +1 more source

Modes of Decolonial and Anti‐Racist Intervention in the Art World: Two Cases From Brazil and Argentina

Bulletin of Latin American Research, Volume 45, Issue 4, October 2026.
ABSTRACT I explore two exhibitions that were curated from a decolonial and anti‐racist position by Indigenous Brazilian and non‐white working‐class Argentine artists: Véxoa: Nós sabemos (Véxoa: We Know) and ¿Qué necesitan aprender los museos? (What Do Museums Need to Learn?).
Peter Wade
wiley   +1 more source

28 GHz Switched Beam Vivaldi Antenna System for V2V Communication in 5G Applications [PDF]

Radioengineering, 2022
A 28GHz switched beam Vivaldi antenna system consisting of 4 Vivaldi antennas for V2V communication is presented. The proposed design is realized on a substrate material of “Rogers 5880” with ε_r=2.2,tanδ=0.002 and 0.508 mm substrate thickness.
A. M. Ameen, M. I. Ahmed, H. Elsadek, W. R. Anis   +3 more
doaj  

César González's Anti‐Racist Aesthetic Praxis at the Intersection of Race, Class and Space in Argentina

Bulletin of Latin American Research, Volume 45, Issue 4, October 2026.
ABSTRACT This article examines the aesthetic praxis of Argentine author and filmmaker César González as an example of anti‐racist art that challenges the often‐sidelined racism faced by residents of poor neighbourhoods (known as villeros), who are frequently presented as Argentina's Other.
Ignacio Aguiló, Ana Vivaldi
wiley   +1 more source

Effects of Classical Music on Behavioral and Physiological Stress Markers in Socially Isolated Prairie Voles

Annals of the New York Academy of Sciences, Volume 1563, Issue 1, September 2026.
Social isolation contributes to behavioral, physiological, and neuroendocrine dysfunction. In prairie voles, classical music exposure significantly reduced validated anxiety‐ and depression‐related behavioral responses and improved cardiac and endocrine measures as a function of chronic social isolation, with minor sex differences.
Yessenia Chavez, Nathan Campbell, Yujun Liu, Hongdao Meng, Jamie Mayer, Christopher Wright, Alex Amidei, Insha Butail, Chloe Steffel, Chirantana Dayanandaswamy, Angela J. Grippo   +10 more
wiley   +1 more source

A 0.7 to 30 GHz Coplanar Vivaldi Antenna

Microwave and Optical Technology Letters, Volume 68, Issue 8, August 2026.
ABSTRACT In the literature there are multiple Vivaldi antenna designs that have a wide impedance bandwidth; however, the usable bandwidth is often limited by pattern degradation at the higher frequencies of the band. This paper presents the design and implementation of a coplanar Vivaldi antenna with a 42.9:1 usable bandwidth ratio (0.7–30 GHz).
Jessica Mundell, Johann Wilhelm Odendaal, Johan Joubert, Bennie Jacobs   +3 more
wiley   +1 more source

A New Antenna Capable of Generating Broadband Plane Spiral Orbital Angular Momentum

IEEE Access
The plane spiral orbital angular momentum (PS-OAM), which is a special form of orbital angular momentum (OAM) beams, solves the problem of OAM beam divergence to some extent.
Na Li, Guirong Feng, Ping Li, Xiaowei Shi   +3 more
doaj   +1 more source

Environmental factors associated with nesting habits and age shape the composition and connection between skin and uropygial gland microbiomes of birds

Journal of Animal Ecology, Volume 95, Issue 8, Page 1435-1452, August 2026.
This study provides new insights into how ecological conditions influence the evolution of host‐associated symbiotic communities and their functional roles. The findings suggest that pathogen pressures linked to nesting habits in birds shape bacterial communities of the uropygial gland, and their connection with the skin microbiome, where the ...
Ester Martínez‐Renau, Kasun H. Bodawatta, Antonio M. Martín‐Platero, Manuel Martín‐Vivaldi, María Dolores Barón, Cristina Ruiz‐Castellano, Manuel Martínez‐Bueno, Knud A. Jønsson, Michael Poulsen, Juan José Soler   +9 more
wiley   +1 more source