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In the ground plane antenna style whip antenna, the plane consists of several wires 1 / 4 λ long radiating from the base of a quarter-wave whip antenna. The radio waves from an antenna element that reflect off a ground plane appear to come from a mirror image of the antenna located on the other side of the ground plane.
A monopole antenna is a class of radio antenna consisting of a straight rod-shaped conductor, often mounted perpendicularly over some type of conductive surface, called a ground plane. [1] [2] [3] The driving signal from the transmitter is applied, or for receiving antennas the output signal to the receiver is taken, between the lower end of ...
Whips mounted on vehicles use the metal skin of the vehicle as a ground plane. In hand-held devices usually no explicit ground plane is provided, and the ground side of the antenna's feed line is just connected to the ground (common) on the device's circuit board. [2] Therefore, the radio itself serves as a rudimentary ground plane.
A 1 / 4 λ monopole antenna and its ground image together form a 1 / 2 λ dipole that radiates only in the upper half of space. The vertical , Marconi , or monopole antenna is a single-element antenna usually fed at the bottom (with the shield side of its unbalanced transmission line connected to ground).
Since all of the equivalent dipole's radiation is concentrated in a half-space, the antenna has twice the gain (+3 dB) of a similar dipole, neglecting power lost in the ground plane. [2] Quarter-wave monopole The most common monopole is a vertical, 1 / 4 wave tall, which is the minimum size for it to self-resonate.
The monthly pension benefit is determined by salary history, years of service, age, and the retirement option selected. TRF members become vested in the pension benefit after 10 years of qualified Indiana service. Members may purchase service credit for military service, out-of-state teaching, and qualified leaves of absence. [2]
Ground wave is a mode of radio propagation that consists of currents traveling through the earth. Ground waves propagate parallel to and adjacent to the surface of the Earth, and are capable of covering long distances by diffracting around the Earth's curvature.
American Teacher is a feature-length documentary created and produced by The Teacher Salary Project. Following the format of the book Teachers Have It Easy: The Big Sacrifices and Small Salaries of America’s Teachers, the film utilizes a large collection of teacher testimonies and contrasts the demands of the teaching profession alongside interviews with education experts and education ...