WIDEBAND MONOPOLE ANTENNA POR HF AND VHF

The objective of this thesis is centered in the synthesis of a method of design of broadband monopole antennas for the range of HF and VHF. The antenna must have a practical size to be installed in a mobile station (automobile) and the power must radiate omnidirectionally for transmission of interference in the frequency band of interest (20-100MHz). There are several antenna topologies that can be used, each with a variety of options of loaded sections and of them the antenna selected was the traditional monopole antenna of whip type, due to its practical size to be installed in a mobile station and the stability of its structure. With the help of CST Studio Site 2015 software, the simulation and optimization processes of the proposed antenna were carried out. This antenna was numerically optimized taking into account the load elements and considering the return losses (S11), the voltage standing wave ratio (VSWR) and the gain value, among other parameters. The results of the optimal load solution for the monopole antenna are compared to each other to arrive at the best design. The best result obtained is the monopole antenna with four load sections distributed along its length. The simulation results should how that the proposed antenna to meet the specifications of the voltage standing wave ratio below 3 (VSWR<3:1) over the entire frequency band specified.