Ad
related to: antenna without ground plane control rod- Trending on eBay
Inspired by Trending Stories.
Find Out What's Hot and New on eBay
- Under $10
Fun Stuff. Ships Free.
Brand New. Guilt Free.
- Daily Deals
Lowest Prices on Top Items.
Save Money with eBay Deals.
- Business & Industrial
From Construction to Catering.
eBay Has All B&I Products For You.
- Trending on eBay
Search results
Results from the WOW.Com Content Network
If the ground plane is large enough, due to the waves reflected from it the antenna acts as if it has an image antenna identical to the monopole underneath the plane. [69] The antenna rod and its image together act like a dipole antenna of twice the length, so a monopole over an infinite, perfectly conducting plane has a radiation pattern ...
To prevent this, with stationary whips mounted on structures, an artificial "ground plane" consisting of three or four rods a quarter-wavelength long connected to the opposite side of the feedline, extending horizontally from the base of the whip, is often used. [5] This is called a ground plane antenna. [6]
Since monopole antennas rely on a conductive surface, they may be mounted with a ground plane to approximate the effect of being mounted on the Earth's surface. Diagram of the electric fields (blue) and magnetic fields (red) radiated by a dipole antenna (black rods) during transmission. More complex antennas increase the directivity of the antenna.
The rubber ducky antenna (or rubber duck aerial) is an electrically short monopole antenna, invented by Richard B. Johnson, that functions somewhat like a base-loaded whip antenna. It consists of a springy wire in the shape of a narrow helix , sealed in a rubber or plastic jacket to protect the antenna. [ 1 ]
A whip antenna with several rods extending horizontally from base of the whip in a star-shaped pattern, similar to an upside-down radiate crown, that form the artificial, elevated ground plane that gives the antenna its name. The ground plane rods attach to the ground wire of the feedline, the other wire feeds the whip. Since the whip is ...
Omnidirectional radiation patterns are produced by the simplest practical antennas, monopole and dipole antennas, consisting of one or two straight rod conductors on a common axis. Antenna gain (G) is defined as antenna efficiency (e) multiplied by antenna directivity (D) which is expressed mathematically as: G = e D {\displaystyle G=eD} .
Yagi antenna for UHF TV reception with 22 parasitic elements; 4 reflectors attached to the vertical bracket at left, and 18 directors attached to the horizontal beam at right. The driven element is attached to the black box next to the reflectors. The antenna is most sensitive to radio waves coming from the right, parallel to the antenna's axis.
The simplest antennas, monopole and dipole antennas, consist of one or two straight metal rods along a common axis. These axially symmetric antennas have radiation patterns with a similar symmetry, called omnidirectional patterns; they radiate equal power in all directions perpendicular to the antenna, with the power varying only with the angle ...
Ad
related to: antenna without ground plane control rod