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What is antenna

2020-01-05

RF element, as the serious wireless antenna manufacturer and antenna solutions provider, want to make the brief about wireless antennas, which we are manufacturering now.

Antenna is a kind of converter, which is used to capture or transmit radio waves.

In transmission, radio transmitter supplies an electric current to antenna terminal and then antenna radiates the energy from the current as radio waves. In reception, antenna intercepts some of the power of radio wave and then antenna produces an electric current at its terminal.

We know that communication, radar, navigation, radio, television and other radio equipment transmit information through radio waves. Therefore antenna is essential component of all radio equipment.

So according to the purposes, antenna can be divided into communication antenna, broadcast antenna, TV antenna, radar antenna, etc. 

And We, RF element focus on the developing and manufacturing of communication wireless antennas, including directional antenna and omnidirectional antenna, frequency range from 300MHz to 30GHz.

What kind of antenna performance we pay attention to

1,Antenna pattern. The antenna pattern should match the coverage requirements. An antenna has one major lobe and a number of side lobes. Ideally the fewer side lobes, the better performance, because they can create secondary sources of interference.

2,Gain. Antenna gain indicates how strong a signal an antenna can send or receive in a specified direction. Many people think that the higher the gain rating is on an antenna, the better the coverage. That is not necessarily in the case. On an open and flat highway, a high gain antenna will be better. But in a hilly environment, a high gain antenna may cause poor performance. We should need to take a look at the condition of coverage environment, to select the appropriate gain antenna for best results.

3,Beam Width. The bandwidth defines the operating range of the frequencies for the antenna. The half power point for the beam width is the angular separation where there is 3 dB reduction off the main lobe. Normally, the wider the beam width, the lower the gain of the antenna.

4, Polarization Mold. The polarization of an antenna is defined as the direction of the electromagnetic fields produced by the antenna as energy radiates away from it. These directional fields determine the direction  in which the energy moves away from or is received by an antenna. Thus, a horizontally polarized antenna will perform better when mounted near a ceiling, whereas a vertically polarized antenna will perform better when mounted near a side wall.

5,Voltage Standing Wave Ratio. VSWR is a measure that numerically describes how well the antenna is impedance matched to the radio or transmission line it is connected to. A VSWR value under 2 is considered suitable for most antenna applications.

6, Front to Back Ratio. The front to back ratio is a ratio in respect to how much energy is directed in the exact opposite direction of the main lobe of the antenna. The higher F/B ratio, the better antenna performance.

With the strong RF engineering background, RF element are ready to consult, design and manufacture the custom antenna products built to our clients's exact specifications, including for custom gains and frequencies, antenna lengths, or distinct OEM packaging.