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aerospace RF amplifier antenna pcb assembly

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aerospace RF amplifier antenna pcb assembly

產品規格

Model No:	aerospace RF amplifierantennapcbassembly

Country	CN
Payment Term	T/T

產品描述

Aerospace defence military equipment custom RF
amplifiers and antennas product pcba motherboards assembly electronics oem contract
manufacturing services OEM CEM EMS experience company-China Shenzhen Topscom

 
<img src="http://i.bosscdn.com/product/76/b1/d1/789c4c7b9087772dfde7784692.jpg@watermark=2&color=I0ZGRkZGRg%3D%3D&type=ZHJvaWRzYW5zZmFsbGJhY2s%3D&size=17&p=9&t=80&text=cGNiYXNzZW1ibHljaGluYS5ib3NzZ29vLmNvbQ%3D%3D" title="smt workshopnew" alt="smt workshopnew" /> 
Amplifier Electronic OEM Contract Manufacturing Assembly Service: 

A radio frequency power amplifier (RF power
amplifier) is a type of electronic amplifier that converts a low-power
radio-frequency signal into a higher power signal. Typically, RF power
amplifiers drive the antenna of a transmitter. Design goals often include gain,
power output, bandwidth, power efficiency, linearity (low signal compression at
rated output), input and output impedance matching, and heat dissipation.


 


Many modern RF amplifiers operate in
different modes, called classes, to help achieve their design goals. Some
classes are class A, class B, class C and class E. Class D amplifiers are
rarely used for RF purposes because they need even higher frequency devices.


 


Modern RF power amplifiers use solid-state
devices such as bipolar junction transistors and MOSFETs. Although transistors
and other modern solid-state devices have replaced vacuum tubes in most
electronic devices, tubes are still used in some high-power transmitters


 


An antenna (plural antennae or antennas),
or aerial, is an electrical device which converts electric power into radio
waves, and vice versa.[1] It is usually used with a radio transmitter or radio
receiver. In transmission, a radio transmitter supplies an electric current
oscillating at radio frequency (i.e. a high frequency alternating current (AC))
to the antenna's terminals, and the antenna radiates the energy from the
current as electromagnetic waves (radio waves). In reception, an antenna
intercepts some of the power of an electromagnetic wave in order to produce a
tiny voltage at its terminals, that is applied to a receiver to be amplified.


 


Antennas are essential components of all
equipment that uses radio. They are used in systems such as radio broadcasting,
broadcast television, two-way radio, communications receivers, radar, cell
phones, and satellite communications, as well as other devices such as garage
door openers, wireless microphones, Bluetooth-enabled devices, wireless
computer networks, baby monitors, and RFID tags on merchandise.


 


Typically an antenna consists of an
arrangement of metallic conductors (elements), electrically connected (often
through a transmission line) to the receiver or transmitter. An oscillating
current of electrons forced through the antenna by a transmitter will create an
oscillating magnetic field around the antenna elements, while the charge of the
electrons also creates an oscillating electric field along the elements. These
time-varying fields radiate away from the antenna into space as a moving
transverse electromagnetic field wave. Conversely, during reception, the
oscillating electric and magnetic fields of an incoming radio wave exert force
on the electrons in the antenna elements, causing them to move back and forth,
creating oscillating currents in the antenna.


 


Antennas can be designed to transmit and
receive radio waves in all horizontal directions equally (omnidirectional
antennas), or preferentially in a particular direction (directional or high
gain antennas). In the latter case, an antenna may also include additional
elements or surfaces with no electrical connection to the transmitter or
receiver, such as parasitic elements, parabolic reflectors or horns, which
serve to direct the radio waves into a beam or other desired radiation pattern.


 


The first antennas were built in 1888 by
German physicist Heinrich Hertz in his pioneering experiments to prove the
existence of electromagnetic waves predicted by the theory of James Clerk
Maxwell. Hertz placed dipole antennas at the focal point of parabolic reflectors
for both transmitting and receiving. He published his work in Annalen der
Physik und Chemie (vol. 36, 1889).
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