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For a monopole antenna (a), the Earth acts as a ground plane to reflect radio waves directed downwards, making them seem to come from a virtual "image antenna" (b).In Telecommunications, a ground plane is a flat or nearly flat horizontal conducting surface that serves as part of an antenna, to reflect the radio waves from the other antenna elements.
The antenna may not be more than 20 feet (6.1 m) above the highest point of the structure it is mounted to, or the highest point of the antenna must not be more than 60 feet (18.3 m) above the ground (47 CFR 95.408(c)) if installed in a fixed location. [4] CB radios must include AM or SSB modulation and may include frequency modulation. [5]
At frequencies above 30 MHz an automobile or aircraft body makes an adequate ground plane, [20] [21] so whip antennas for two-way radios and cell phones are mounted on car bumpers or roofs, [8] and aircraft communication antennas frequently consist of a short conductor in an aerodynamic fairing projecting from the fuselage; this is called a ...
Orbital's space launch vehicles are considered the industry standard for boosting small payloads to orbit. The Pegasus launch vehicle is launched from the company's L-1011 carrier aircraft, Stargazer and has proven to be the industry's small space launch workhorse, having conducted 40 missions from six different launch sites worldwide since ...
A blade antenna on a military aircraft in Japan. This is not a dual-band type. A dual-band blade antenna is a type of blade antenna, which is a monopole whip antenna mounted on the outside of an aircraft in the form of a blade-shaped aerodynamic fairing to reduce air drag. It is used by avionics radio communication systems.
Channel Master's original product was a prefabricated television aerial with hinged elements which would unfold and snap into place; this patented design greatly reduced installation time as existing antenna designs at the time had to be bolted together from multiple pieces by rooftop installers. [17]
A choke ring antenna is a directional antenna designed for reception of GNSS signals from satellites. It consists of a number of concentric conductive cylinders around a central antenna. The first choke ring antennas were invented at JPL; [ 2 ] since 1989 they have been improved and extended by many companies.
Two Astro Flight Astro 40 ferrite motors powered the craft via a 6:1 gearbox swinging a 36x24 wood propeller. More than one thousand solar cells on the wing were the sole source of energy, producing roughly 450 watts of power. The craft, weighing in at 27 pounds with its 32' wingspan, had a service ceiling of 20,000 feet (6,100 m) depending on ...
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