Active Phase-Conjugating Rotman Lens With Reflection Amplifiers for Backscattering Enhancement

Development and Modeling of the Antenna System the Direction Finder Unmanned Aerial Vehicle

“…An analysis of works [2][3][4][5][6][7][8][9][10][11][12] shows that for direction finding antenna systems, classical vibrator antennas, less often slot antennas and TEM horns, have found the greatest application, and the most common direction-finding method is correlationinterferometric. The antenna systems themselves often have a ring geometry, while the receiving and processing equipment is located in the geometric center of the system.…”

“…This solution has some disadvantages, among which we pay attention to the linear vertical size of the central metal post. In some cases, for example, when placed on a mast, when connecting antenna systems of other frequency ranges or lightning protection elements [7], the height of the central vertical scattering structure is significantly greater than the length of the antenna elements of the system. Such a ratio of linear dimensions can lead to a significant irregularity of the antenna element radiation pattern in the vertical plane, and, as a result, to a significant decrease in sensitivity from the corresponding elevation directions, which is unacceptable for radio monitoring systems, especially UAVs.…”

“…To solve this problem, two variants of ring antenna arrays from modified dipoles [7] were developed and studied for the frequency range from 1 GHz to 5 GHz. into construction vibrators located in the immediate vicinity of the central rack, additional resistive loads are introduced to ensure the stability of the shape of the radiation pattern of each element in the array in the frequency band with an overlap factor of more than 3.…”

“…As stated in the statement of the research task, the proposed article examines the results of simulation of a relatively new design of the antenna [7], which is being developed for UAV direction finding and contains the TSA (Tapered Slot Antenna) concept. It should be noted that specifying a specific task for designing an antenna system gives a variety of shapes and proportions between its structural elements.…”

Multibeam SIW Leaky-Wave Antenna with Beam Scanning Capability in Two Dimensions

“…Phase shifters' structures are not suitable for changing the phase in the wide frequency band. One of the solutions to this problem with the lowest cost and best performance in broadband bandwidth is the Rotman lens [12,25]. The other advantages of the Rotman lens are that it is completely passive, has a wide scanning angle, and has a fast scanning speed with high gain.…”