Introduction to the role of antennas
Published:
2023-01-03
An antenna is an electronic device used to transmit or receive radio waves or electromagnetic waves more widely. Antennas are used in systems such as broadcast television, point-to-point radio communications, radar, and space exploration. Antennas usually work in air and outer space, but can also work underwater, and even in soil and rock at certain frequencies. In physics, an antenna is a combination of one or more conductors that can either radiate an electromagnetic field due to the applied alternating voltage and associated alternating current, or it can be placed in an electromagnetic field due to the induction of the field. Alternating current is generated inside the antenna, and its terminal generates alternating voltage.
Whether there is a non-conductor in the antennarange is also instinctive to the antenna, because the non-conductor is not thermally conductive, but the dielectric constant of the non-conductor and the dielectric constant in the atmosphere are not the same. Therefore, there are non-conductors in the antenna range, and there are probably non-conductors of different material masses, and the antenna could have become an urban explosive change. For example, rare components such as the inconsistency of external premise such as plastic shell outside the antenna, path plate at the bottom of the on-board antenna, thickness of plastic shell, isolation from the antenna, and product placement on the wall or wooden door, urban sensitization antenna instinct. In this scenario, the antenna must also be specially adjusted and tested, otherwise changes in antenna performance will lead to reduced antenna performance or even unusability.
The phone is full of antennas from GPS, Bluetooth, wifi, 2G, 3G, 4G and other frequency bands. The lower the frequency, the larger the size. Millimeter wave, as the name suggests, has a wavelength range of less than 10mm. At a quarter of the wavelength, a lattice of about 2.5 mm forms an array with regular intervals. 4G antennas are generally arranged on the upper and lower ends and sides of the mobile phone, using LDS (a three-dimensional circuit manufacturing process in which the laser selectively deposits metal on 3D curved plastic) and FPC (flexible circuit board) and the side metal frame to realize the terminal antenna function: in the metal body mobile phone, a section of exposed metal in the middle frame and FPC in the mobile phone constitute an antenna: in 2017, glass body mobile phones became popular, and the process and materials used for such mobile phones are still FPC and LDS processes. There are also antennas manufactured on glass housings and glass holders: frame touches and antennas are manufactured on 3D glass brackets with a thickness of 0.1-0.2mm.
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