Results 241 to 250 of about 1,413,233 (284)

A leaky-wave groove antenna at optical frequency

Journal of Applied Physics, 2012
In the framework of nanoantennas functioning at optical frequencies, we present here a new kind of leaky-wave antenna realized as a groove in an aluminum superstrate, supported by a silver substrate. The antenna works in the optical frequency range where the silver acts as a dielectric with equivalent refractive index between zero and one.
POLEMI, Alessia, Stefano Maci
openaire   +4 more sources

Single-Conductor Strip Leaky-Wave Antenna

IEEE Transactions on Antennas and Propagation, 2003
The radiation characteristics of a single-conductor strip leaky-wave antenna is investigated. This structure has only a single-conductor strip on a substrate without a background plane. The broadband characteristics of the first higher order space-wave mode render this structure a broadband antenna. These result in a very wide leaky region.
null Wanchu Hong, null Yu-De Lin
openaire   +1 more source

Graphene terahertz leaky-wave antennas

2019
In this chapter, we focus on the recent developments made in the context of graphene THz antennas, especially those exploiting the graphene field effect to reconfigure their radiating features. To this purpose, we first review the electronic properties of graphene in the THz range from both a physical and an engineering perspective.
Fuscaldo W, Burghignoli P, Baccarelli P, Galli -A   +3 more
openaire   +1 more source

Propagation characteristics of leaky waves on a 2D periodic leaky-wave antenna

2017 IEEE MTT-S International Microwave Symposium (IMS), 2017
A two-dimensional (2D) periodic leaky-wave antenna consisting of a periodic distribution of rectangular patches on a grounded dielectric substrate, excited by a narrow slot in the ground plane, is studied here. The TM0 surface wave that is normally supported by a grounded dielectric substrate is perturbed by the presence of the periodic patches to ...
Sohini Sengupta, David R. Jackson, Stuart A. Long   +2 more
openaire   +1 more source

Horn Image Guide Leaky-Wave Antenna

MTT-S International Microwave Symposium Digest, 1981
A novel approach for designing a frequency-scanning millimeter-wave antenna is described. The antenna is constructed by using an image wide leaky-wave antenna embedded in a long trough with metal flares along both sides. The optimum flare angle for achieving maximum gain is theoretically predicted.
T.N. Trinh, R. Mittra, R.J. Paleta
openaire   +1 more source

SIW leaky wave antennas

2014 44th European Microwave Conference, 2014
The substrate integrated waveguide can easily be integrated with planar microwave circuits. Antennas designed on this transmission line have a planar structure, and can be fabricated by a standard PCB technology, so they are suitable for mass production.
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A Reconfigurable Leaky Wave Antenna

2023 33rd International Conference Radioelektronika (RADIOELEKTRONIKA), 2023
Jan Machac, Milan Svanda, Vaclav Kabourek   +2 more
openaire   +1 more source

Full wave analysis of leaky-wave antennas

2008 IEEE Antennas and Propagation Society International Symposium, 2008
Leakage from slotted waveguides is a well-known phenomenon and has been thoroughly investigated during the past decades. The interest in leaky-wave antennas mainly stems from the possibility of scanning the beam with frequency [1]. The analysis of slotted waveguides has been first performed by means of a transverse network representation of the open ...
LUCIDO, Mario, MIGLIORE, Marco Donald, PANARIELLO, Gaetano, SCHETTINO, Fulvio   +3 more
openaire   +1 more source

Millimeter-wave dielectric leaky-wave antennas

Proceedings of ISSE'95 - International Symposium on Signals, Systems and Electronics, 2002
A dielectric leaky-wave antenna with a new perturbation scheme is developed. The attenuation constant with different gap width between metal patches is determined experimentally. The dielectric waveguide used is an anisotropic sapphire rod. The conventional effective dielectric constant (EDC) method is modified to calculate the unperturbed propagation ...
null Chung-Yi Lee, A. Basu, J. Liao, J.S.-M. Wong, B. Houshmand, T. Itoh   +5 more
openaire   +1 more source

Lumped Element and Leaky-Wave Antennas for Millimeter Waves.

1984
Abstract : Some millimeter wave antennas can be scaled from their microwave frequency counterparts, but others cannot because of two main problems; the small wavelengths, which require small waveguide dimensions and pose fabrication difficulties, and higher metal loss.
openaire   +1 more source