Results 221 to 230 of about 8,535 (268)

A reconfigurable radiation pattern metamaterial-inspired antenna

2014 Loughborough Antennas and Propagation Conference (LAPC), 2014
In this work, a reconfigurable radiation pattern metamaterial-inspired antenna is proposed. The structure consists of simple split resonator (SRR) loaded with two open circuits and introduced into the near field region of a monopole antenna. Two configurations are studied by considering the state of the open circuits.
Dakhli, Saber, Floc'H, Jean Marie, Mahdjoubi, Kouroch, Rmili, Hatem, Choubani, F.   +4 more
openaire   +2 more sources

Antenna Radiation Pattern Measurement at a Reduced Distance

2004 Conference on Precision Electromagnetic Measurements, 2004
A method has been developed to obtain the far-field radiation pattern of an antenna at a reduced distance where the far-field distance condition is not satisfied. It uses an asymptotic antenna transmission formula and angular mode deconvolution technique to determine the far-field radiation ...
Jeong-Hwan Kim, Hong-Ki Choi
openaire   +1 more source

Plasma Antenna Radiation Patterns

AIP Conference Proceedings, 2003
Elevation angle pattern measurements of our Plasma Antenna are presented and compared with results from computer models. Good agreement is found for the measurements with patterns predicted by our linearly decreasing conductivity model for the plasma antenna, derived from computer models using readily available packages.
openaire   +1 more source

Radiation pattern of a borehole radar antenna

Geophysics, 2005
Abstract The finite-difference time-domain method was used to simulate radar waves that were generated by a transmitting antenna inside a borehole. The simulations were of four different models that included features such as a water-filled borehole and an antenna with resistive loading.
Karl J. Ellefsen, David L. Wright
openaire   +1 more source

On the Radiation Patterns of Interfacial Antennas

1982
The radiation pattern of an interfacial radiating source is obtained for the case where the source is an infinitely long line source lying along the plane interface of two dielectric half-spaces; for the case where the source is an infinitesimal electric dipole vertically located on the interface; and for the case where the dipole is lying horizontally
openaire   +1 more source

A radiation pattern reconfigurable yagi antenna

2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP), 2017
A planar Yagi antenna with configurable radiation pattern is proposed in this paper. The single planar Yagi antenna structure with unidirectional radiation is designed firstly, and the radiation pattern reconfigurable antenna is consist of four planar Yagi antenna and a RF switch element.
Bing-Long Zheng, Guang-Hua Sun, Shi-Yan Zhou, Sai-Wai Wong   +3 more
openaire   +1 more source

Antenna-on-Chip radiation pattern characterization

2019
Millimeter-wave antenna measurements severely rely on the use of on-wafer probes. For an Antenna-on-chip (AoC), due to the tiny size of the chip (1~2 mm2), the radiation pattern will still be influenced when the probe tip is near the AoC under test (AUT).
Liu, Q., Johannsen, Ulf, van Beurden, Martijn C., Smolders, A. B.   +3 more
openaire   +2 more sources

Analysis of the radiation patterns of reflector antennas

IEEE Transactions on Antennas and Propagation, 1976
The development and application of a numerical technique for the rapid calculation of the far-field radiation patterns of a reflector antenna from either a measured or computed feed pattern are reported. The reflector is defined by the intersection of a cone with any surface of revolution or an offset sector of any surface of revolution.
J. Kauffman, W. Croswell, L. Jowers
openaire   +1 more source

On-body antenna with reconfigurable radiation pattern

2014 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-Bio2014), 2014
On body antenna design is a challenging task due to the body being in the near-field of the antenna and the interaction between the two. The antenna should be designed to have a more application dependent gain pattern and to be less sensitive to near field effects of the body.
openaire   +1 more source

Improving radiation pattern of microstrip antennas

2006 First European Conference on Antennas and Propagation, 2006
It was shown in [1] that polarization currents in the dielectric substrate of microstrip antennas cause deterioration of the radiation pattern. We further study this effect analytically and numerically, with emphasis on techniques for improving the radiation pattern.
Marija M. Nikolic, Antonije R. Djordjevic   +1 more
openaire   +1 more source