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Radio Frequency (RF) antennas are typical external circuits of mobile communication base stations, and A821-18503 is among them. In this article, the application field and working principle of the A821-18503 will be analyzed.

Application Field

A821-18503 is a dualpol dualbma wideband aluminum alloy die-casting VHF-UHF linear polarization omnidirectional antenna. It is widely used by many industries including wireless communication, radio transmission and repeater station, broadcasting station, shipbuilding, oilfield, and electric power. Using a die-casting technology, A821-18503 features high-efficiency radiation, stable radiation pattern, uniform electrical performance, and excellent weather proof performance, even operating in harsh environments from -45℃ to +90℃, withstanding high wind pressure, sand dust, humidity, temperature, and salt spray. due to its durable construction, A821-18503 is particularly suitable for the application where high reliability is critical, such as ships, trains and airplanes.

Working Principle

A821-18503 operates linearly and work in a frequency range of 30 MHz to 960 MHz with linear polarized field. When an RF signal is connected to the antenna, the RF signal will be transformed to an electric field. This electric field will excite the antenna’s metal conductor and create a magnetic field which is also called an elecro-magnet, producing an electromagnetic wave. This electromagnetic wave then propagates in the form of a sine wave and is radiated out into the environment. As the sine wave propagates, it experiences reflections, refractions, diffractions, and other propagation paths due to manmade structures and large objects. As the reflected wave hit receiver antennas, the receiver antenna will re-transforms the electromagnetic wave back into an electric and magnetic field, generating a new RF signal which is demodulated and decoded by the receivers.

Conclusion

The A821-18503 dualpol dualbma wideband aluminum alloy die-casting VHF-UHF linear polarization omnidirectional antenna has a wide range of application due to its unique features, such as high-efficiency radiation, stable radiation pattern, uniform electrical performance, and excellent weather proof performance. The working principle of this antenna is based on the transformation of an RF signal into an electric field which excites the antenna’s metal conductor, producing an electromagnetic wave which radiate out and travels in the form of a sine wave until it hit receiver antennas and produces a new RF signal.

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