Figure 16 shows the significant outperformance of our directional antenna
scheme as compared with the omnidirectional antenna scheme.
Panduro "Statistical cellular Gaussian scatter density channel model employing a directional antenna
for mobile environments," AEU-Int.
The analysis of directional antennas
for CR can be carried out through measurements, modelling, and/or emulation.
Interference Mitigation in WSN by Means of Directional Antennas
and Duty Cycle Control // Wireless Communications and Mobile Computing, 2010.
As for a directional antenna
used in mmWave networks, there can be two candidates as the antenna model: the flat-top model neglecting the side-lobe of the radiation and the cone plus circle/sphere model considering the side-lobe of the radiation.
A bottom directional antenna
offers the benefit of intruder target recognition for traffic that's hidden from that top antenna by the fuselage of the aircraft.
The 525 works with your existing VHF transceiver; you add the supplied Adcock directional antenna
and any transmission you can pick up in the marine band/ham bands, including 121.5 and 130-180 MHz, is converted to a visible on-screen signal with bearing from your boat to the source.
Parabolic-reflector antennas are widely used as microwave directional antennas
. Unfortunately, the illumination of a parabolic mirror becomes rather inefficient when the dimensions of the mirror are not large enough compared to the wavelength.
Because the receiving also occurs in the same donut-shaped pattern, an omni-directional antenna actually collects much more ambient noise from the surrounding area then a directional antenna
. In many cases, you might be able to architect your network using a series of point-to-point backhaul links, instead of using large omni-directional antennas in a hub-and-spoke design.
The Crowne Plaza Irvine also uses the NETGEAR ANT24D18 Indoor/Outdoor 18dBi Patch Panel Directional Antenna
. It offers flexibility in optimizing range and wireless coverage in a variety of indoor and outdoor environments including single floor, multi-floor, and building-to-building connectivity in campus environments.
Shea also set up an Omni directional antenna
at the sales office, which broadcasts to two remote construction trailers, each of which has a 12-inch DBI dish.
Jansky's highly directional antenna
pinpointed this source somewhere in the sky.