An intelligent antenna device with a high gain has been developed. Theoretical and experimental evaluation of noise levels arising during analog-to-digital conversion of luminance microwave signals of television broadcasting has been carried out. A round disk asymmetric antenna with microwave power supply and a broadband coplanar waveguide has been modeled. An antenna of a satellite system for transmitting and receiving digital signals in the microwave range has been modeled. Electrodynamic characteristics of a flat patch antenna with a power divider for wireless communication have been developed and studied. Antenna arrays used in navigation systems have been modeled using a numerical method. Electrodynamic modeling of the electromagnetic field of a round microwave waveguide with a complex-structured anisotropic medium has been carried out. Mathematical expressions were derived to calculate the mean value of the quantization noise power for the different distribution models of brightness on TV images and the linear and nonlinear characteristics of the “light-to-signal” converter. Analytical expressions were obtained to calculate the level of restriction noise, the ratio of the restriction noise power to the quantizing noise power when the distribution of brightness on the images of TV programs is determined by exponentially decreasing model and inversely proportional model and the logarithmic quantization scale is applied. The effect of quantization and restriction noise on image quality on the additive White Gaussian Noise Channel has been experimentally tested. The process of modeling a seven-element antenna array in the range 1574–1610 MHz, which can be used in receivers of GPS navigation systems with adaptive noise suppression algorithms, is considered. The design features of the manufactured sample of the antenna array are noted. The material of the common dielectric base and the mutual position of the antenna elements are chosen, which make it possible to minimize the slope of the frequency dependences of the arguments characterizing the mutual connections between neighboring elements. The results of numerical calculations of the S-parameters are in good agreement with the measurement results.