Results 81 to 90 of about 8,466 (210)

The Design of Broadband Circularly Polarized Multi-beam Antenna with Linearly Polarized Feeding Source and Transmitarray Unit [PDF]

Radioengineering
Among the existing circularly polarized multi-beam transmitarray antennas, circularly or linearly-to-circularly polarized transmitarray units are always required.
Z. Guo, Y. Zhou, H. Yang, S. Li, T. Li, X. Cao   +5 more
doaj  

Microstrip Antennas:

, 2007
The purpose of this thesis is to investigate a novel method to develop broadband microstrip (patch) antennas using substrates containing photonic crystals.
Keith C. Huie, Broadband Radiation Patterns, Keith Huie   +2 more
core  

A Transceiver-Shared Photonic Integrated Broadband Multi-Beamformer Based on an Extended Blass Matrix

Photonics
Multi-beam phased array antennas have become essential in modern radar and communication systems, offering high gain, superior directivity, and exceptional agility.
Ruixuan Wang, Weichao Ma, Wangzhe Li
doaj   +1 more source

Design of Sievenpiper HIS for use in planar broadband antennas by means of effective medium theory [PDF]

Advances in Radio Science, 2007
The claim for multistandard operating handsets of small physical size as well as the ever increasing demand for higher data rates require new broadband operating antennas.
S.K. Hampel, O. Schmitz, O. Klemp, H. Eul   +3 more
doaj  

A Crosslayer Geographic Routing Algorithm for the Airborne Internet

, 2010
The Airborne Internet is envisioned to be a large scale multihop wireless mesh network of commercial passenger aircraft connected via long range highly directional air-to-air radio links.
F. Rossetto, F. Hoffmann, Rossetto, Francesco, Medina, Daniel, D. Medina, Rokitansky, Carl-Herbert, Hoffmann, Felix, C.-H. Rokitansky   +7 more
core   +1 more source

Overview of Vivaldi Antenna Selection for Through-Wall Radar Applications

Sensors
This paper analyzes broadband antennas, with a special focus on Vivaldi antennas, for their suitability for through-wall radar applications. It assesses various antenna designs, emphasizing high gain, wide impedance bandwidth, and effective wall ...
Mariana Amador, André Rouco, Daniel Albuquerque, Pedro Pinho   +3 more
doaj   +1 more source

Wideband 0.5–50 GHz double‐ridged guide horn antenna using coaxial‐to‐ridge waveguide launcher

IET Microwaves, Antennas & Propagation
Ever‐increasing bandwidth requirements from various industries drive the need for the ever‐increasing bandwidth of antennas used for testing.
Bennie Jacobs, Johann W. Odendaal, Johan Joubert   +2 more
doaj   +1 more source

Optical-SDMA for Broadband Aeronautical Communications"

, 2003
Broadband communication for aircraft passengers is facing one of the most promising markets of near future. While currently systems introduced in L and Ku band are already limited in bandwidth considering service provisioning to several airline fleets ...
Giggenbach, Dirk, Holzbock, Matthias, Werner, Markus, Lücke, Oliver   +3 more
core  

Design of a Broadband Blade Antenna

Defence Science Journal
Blade antennas are preferred for use in airborne platforms because of their radiation pattern, wide bandwidth, and compact size. Essentially, blade antennas are a type of monopole antennas, which require a ground plane owing to their design. In avionics, the outer surface of the air platform serves as the ground plane for blade antennas.
null Burcu Güzel Bahar, Murat ÜÇÜNCÜ, null Hayrullah Yildiz   +2 more
openaire   +1 more source

Adaptive antennas at the mobile and base stations in an OFDM/TDMA system

, 2001
In recent years, several smart antenna systems have been proposed and demonstrated at the base station (BS) of wire-less communications systems, and these have shown that significant system performance improvement is possible.
Cheng, RSK, Wong, KK
core