Quantcast Truncated Paraboloid

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
3-18 If a dipole is used as the source of radiation, there will be radiation from the antenna into space (dotted lines in figure 3-17) as well as toward the reflector. Energy that is not directed toward the paraboloid has a wide-beam characteristic that would destroy the narrow pattern from the parabolic reflector. This occurrence is prevented by the use of a hemispherical shield (not shown) that directs most radiation toward the parabolic surface. By this means, direct radiation is eliminated, the beam is made sharper, and power is concentrated in the beam. Without the shield, some of the radiated field would leave the radiator directly. Since it would not be reflected, it would not become a part of the main beam and thus could serve no useful purpose. The same end can be accomplished through the use of a PARASITIC array, which directs the radiated field back to the reflector, or through the use of a feed horn pointed at the paraboloid. The radiation pattern of a parabola contains a major lobe, which is directed along the axis of revolution, and several minor lobes, as shown in figure 3-18. Very narrow beams are possible with this type of reflector. View A of figure 3-19 illustrates the parabolic reflector. Figure 3-18.—Parabolic radiation pattern. Truncated Paraboloid View B of figure 3-19 shows a horizontally truncated paraboloid. Since the reflector is parabolic in the horizontal plane, the energy is focused into a narrow horizontal beam. With the reflector truncated, or cut, so that it is shortened vertically, the beam spreads out vertically instead of being focused. Since the beam is wide vertically, it will detect aircraft at different altitudes without changing the tilt of the antenna. It also works well for surface search radars to overcome the pitch and roll of the ship.

Electrical News
What To Do While Waiting for Apple iPhone6 Teardown
Teardown.com will have full Apple iPhone6 teardown next week. Here's...
EEVblog #662- How & Why to use Integration on an Oscilloscope
In this tutorial Dave demonstrates the seldom used and often...
Embedded Systems Programming Languages
The needs of embedded developers are sufficiently "special" that specialized...
New 'Runaway Toyota' Case Tests DOJ's Integrity
Just as the memory of Toyota's unintended acceleration cases began...
Intel Buys Powerwave Patents
Intel acquired more than 1,400 patents and patent applications from...
Ethernet: Ticket to Driverless Car
New vehicle applications will depend on high data rates that...
Introducing 4 AXYZ's 3D Printing Wood Machines
4 AXYZ is in the additive manufacturing business. But instead...
Talking About Cool Ideas With Proto Labs
Proto Labs expects to announce its next winners Oct. 7....
Creating an 8x8x8 3D LED Cube: Testing the 8x8 Panels
Creating an 8x8x8 3D tri-color LED cube from the ground...
Will Artificial Hearts Be Next Big Thing in Medtech?
The total artificial heart might be the next medtech goldmine....
Connected EVs Drive Farther, Project Finds
A research consortium headed by carmaker BMW explored ways to...
Moore's Law Has No End in Sight
Gallium arsenide (GaAs) will soon outpace silicon as a higher-performance...
Mars Probe Looks for Atmosphere 'Lost in Space'
NASA's latest Martian probe is fast approaching the Red Planet...
19 Views of IDF 2014
Intel tipped a Xeon-class processor for microservers, a 3D camera,...
3D IP: Intellectual Property Issues for Innovators
Patience Jones will be talking about "3D IP: Intellectual Property...
Electronex 2014 – Walkaround
Dave walks around the Electronex 2014 electronics exhibition at the...
Friday Quiz: Electrical Heroes
Test your knowledge of electrical history....
Could AMS' Expansion Be Bad News for Europe?
An Austrian chip manufacturer getting hold of another wafer fab...
World's First 3D Printed Car Live Printed This Week
History will be made this week as Local Motors live...
2 Years of Plenty Coming for Chip Industry
Amid an abundance of market opportunities both in terms of...

Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +