S18512P12NF

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RF antennas invest radio waves in order to distribute them to the atmosphere or to receive them from the atmosphere. The S18512P12NF is a type of RF antenna, used in different application fields and relying on specific working principles in order to perform its functions.

When used for transmission purposes, the antenna, the transmitting antenna, converts the electric energy of the signal into a radio wave by a modulation mechanism and transfers it to the atmosphere. The modulation mechanism is basically the varying of the electromagnetic field of the antenna with the information contained in the signal. The varying of the electromagnetic field will cause a variation of the propagation of the wave through the medium, and the information of the signal will be carried over to the atmosphere. This type of antenna is usually employed for base transceiver stations (BTS) of cellular networks, high-frequency (HF) radiotelephony and shortwave radio transmissions.

When used for reception purposes, the antenna, receiving antenna, captures the radio wave generated from the atmosphere and converts it into an electric signal. The reorganization of the electromagnetic field of the wave which is made by the varying of the electric field and magnetic field of the wave in its way through the atmosphere, is captured by the receiving antenna and reconstructed as a signal. This type of antenna is usually employed for HF receivers and ship-to-shore radios.

The way an antenna works is mostly based on its design, which will define the gain, polarization, directivity and impedance characteristics of the antenna. In the case of the S18512P12NF, it is a 125MHz~960MHz wideband Omnidirectional antenna, designed for 890MHz operation only. Its gain is 5dBi, it has vertical polarization with radiative pattern consisting of an omni-directional radiation lobe, and presents an impedance of 50Ω along an impedance bandwidth of 125MHz~960MHz (50Ω VSWR ≤ 2.0). The antenna is a monopole antenna, an antenna intended for monopolarized radiation.

Regarding applications, the S18512P12NF is used mostly for distributed antenna systems (DAS), a method that consists of dividing a signals bandwidth among multiple antennas distributed in a given space in order to improve the coverage, the data rate and the receipt of weak signals. It may also be used for vehicle tracking and Vehicle Location Services (VLDAS) applications.

To sum it up, the S18512P12NF is an omnidirectional monopole antenna, designed for the frequency ranges of 125MHz~960MHz and with 890MHz as its central frequency. Its gain is 5dBi and it presents an impedance of 50Ω along an impedance bandwidth of 125MHz~960MHz (50Ω VSWR ≤ 2.0). This type of antenna is employed mostly for distributed antenna system (DAS) and vehicle tracking applications.

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