What is the coaxial antenna?
Coaxial antenna is used to perform waves of radiofrequency frequency (RF) at a specific frequency between electronic devices such as global positioning systems (GPS), wireless phones, wireless network systems (WLAN) and communication systems in buildings, tunnels, public transport units and for emergency services. The purpose of the antenna is to protect both to protect and aim a specific RF signal to achieve its goal with the greatest force and the least distortion or disturbance from other signals. The first patent on the coaxial antenna in the United States (USA) was filed in 1937 Arnold B. Bailey at work for the Bell Laboratory. Both are strong and stable; And easy to install. The installation requirements include maintaining an antenna at least 4 inches (about 10 cm) from the walls, using non -metallic and non -conductive clamps to hold the antenna in place, avoiding metal structures near the antenna and providing dust and impurities protection. Everything that settles on a coaxial antenna can eventually out ofcause distortion or loss of signal.
The tubular antenna is most often used from an internal conductor, concentric dielectric, external conductor, mica barrier tape and outer cloak. The internal wires are made of solid copper or copper aluminum wire and outer wires are usually copper tubes or overlapping, milled and slot copper tapes. Among the internal and external wires is a concentric dielectric foam core, which provides protection against accidents that could affect the arrival of signal and transmission. RF signals carried out by copper cause copper temperature, so the height barrier tape protects the antenna against overheating, which can cause distortion of the signal. The outer cladding is made of flexible polyethylene thermoplastic, which acts as a slowing of fire.
Since construction is very similar, coaxial cables can also be used as coaxialAntennas. However, coaxial antennas have several differences from the basic characteristics of coaxial cables. Unlike standard coaxial cables, the waves of the transverse electrical magnetic (TEM) mode, which are created and grows inside the antenna, unlike standard coaxial cables. Small gaps or holes in the outer copper conductor of the antenna can create a connecting mechanism between the interior of the antenna and the environment of the outer environment into the coaxial antenna.
antennas can be configured as a joined or radiation regime. The size, position, shape and distance of the wire aperture determine coaxial antenna binding mechanisms and radiation characteristics. The tied mode means that the holes are located closer to each other than the operating frequencies and the antenna works on a wide frequency of the Range. The radiation mode means that the holes are located approximately the same as the operating frequencies and emit the required frequency.