چكيده به لاتين
With the advancement of technology in telecommunication and electronic devices, the need for a broadband antenna to send and receive information or energy from a span has become even more important. Intermittent logarithmic antennas have always been considered by antenna designers since they were introduced due to their weight and dimensions, and their wide coverage. In the designs for the intermittent logarithmic structure, most of the dipole antenna or patch antenna is used. Due to the low bandwidth of these antennas, a large number of antennas are needed to cover broadband bandwidth. The innovation used in this project is the use of symmetric vivid antenna whose higher frequency modes have relatively broadband bandwidth, which, unlike most logarithmic antenna designs, has a narrow-line transmission line, which means the gradual increase of the impedance characteristic of the transmission line This structure is used. The use of the narrow-band transmission line results in better impedance matching and the need to use the load-matching load line. The matching load at the end of the intermittent logarithmic transmission line causes an antenna, in which one of the antennas is activated, to waste part of the power in the matching resistance. The achievement of a 10-dB impedance rectifier in the frequency range of 1 to 10 GHz, with the characteristics of long-range radiative and positive-field characteristics, and the characteristics of the time domain (band delay and pulse correction), are the main objectives of this project. To achieve these specifications, we first start by calculating the impedance of the antenna using an approximation of the antenna with curved wire antennas (due to the focus on the antenna edges) and simulating it in the CST software. In order to get the optimal characteristics of the alternating logarithmic antenna faster, we use an analog equivalent circuit in the ADS software. Eventually, by converting each of the equivalent circuits to the VVDI antenna, we will simulate the final antenna in the CST software and use optimization algorithms to achieve optimal properties.
