Abstract
Leakage coaxial cable is a kind of coaxial cable with various slot structures on the outer conductor of the cable. It can transmit signal and transmit or receive signal and has dual functions of signal transmission line and antenna. Leakage cable has the advantages of strong environmental adaptability, uniform signal coverage, and less attenuation. It is not only widely used in closed or semiclosed space with high signal reception quality, such as tunnels, subway, underground parking lot, and elevators but also can realize security and theft-proof monitoring and protection in some areas, such as oil wells, mining fields and natural resource protection areas, military fortresses, museums, airports, banks, and schools. This paper introduces the classification and electrical parameters of leaky coaxial cables. On the basis of U-groove leaky coaxial cables, the relationship between the parameters of groove holes in U-groove and the loss of leaky coaxial cables is simulated and analyzed by HFSS software. The improved method of U-groove structure is obtained, and the curved hook-groove leaky coaxial cables are designed according to this method. The simulation results show that the coupling loss of the cable is lower than that of the U-groove leakage cable, and the transmission loss is still within the national standard. It lays a theoretical foundation for the design and development of leaky coaxial cable with low coupling loss.
Highlights
Leakage coaxial cable is abbreviated as leaky cable, which is developed on the basis of radio-frequency coaxial cable [1]
Transmission loss fitting curve Coupling loss fitting curve about 6 dB lower than that of U-groove leakage cable. e transmission loss of the leaky cable increases by 0.24 dB/ 100 m, and the coupling loss decreases by 1.53 dB for every 1 mm increase of the overall groove width of the curved hook groove
When the radiation attenuation of the leaky cable increases, the electromagnetic wave energy radiated along the slot of the outer conductor of the leaky cable is larger, the electromagnetic wave radiation range will increase, the electromagnetic wave signal received by the half-wave dipole antenna will be stronger, and the coupling loss of the leaky cable will be smaller, so the coupling loss of the leaky cable with U-groove and curved hook groove has the opposite trend with the transmission loss
Summary
Leakage coaxial cable is abbreviated as leaky cable, which is developed on the basis of radio-frequency coaxial cable [1]. Due to its dual functions, leaky coaxial cable has the advantage that a discrete antenna cannot be replaced in the wireless communication system In recent years, it has been widely used in closed or semiclosed areas such as metros, tunnels, underground shopping malls, mines, underground streets, and large buildings where the electromagnetic wave cannot reach or propagate badly, so as to solve the problem of signal coverage that many single antennas cannot solve [4, 5]. E slot spacing of the outer conductor of the coupled leakage cable is not in an order of magnitude [6,7,8] with the wavelength of the electromagnetic wave being transmitted by the cable. The influence of parameters of U-groove on transmission loss and coupling loss of leaky cable is simulated and analyzed by HFSS software. e structure of U-groove is improved through comparative analysis, and the leaky coaxial cable with a curved hook groove with lower coupling loss is designed
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