Airborne Conical Antenna Arrays
- PDF / 1,489,369 Bytes
- 11 Pages / 612 x 792 pts (letter) Page_size
- 34 Downloads / 215 Views
NNA AND FEEDER SYSTEMS
Airborne Conical Antenna Arrays L. I. Ponomareva, *, **, A. A. Vasina, O. V. Terekhina, and L. S. Turkob aMoscow
Aviation Institute, Moscow, 125993 Russia Moscow Research Institute “Agat,” Zhukovsky, Moscow oblast, 140185 Russia *e-mail: [email protected] **e-mail: [email protected]
b
Received May 7, 2019; revised March 6, 2020; accepted March 15, 2020
Abstract—The study presents an algorithm and the results of analysis of the sum-and-difference directional characteristics of an airborne conical antenna arrays (AAs) of slot radiators located on the conductive surface of the cone. It is shown that the maximum directivity of such antennas in the radiation mode and the steepness of the difference radiation pattern (in the E-plane) in the receive mode for pointed cones can significantly exceed similar parameters of the equivalent planar aperture. DOI: 10.1134/S1064226920090107
INTRODUCTION Antenna arrays (AAs) located on the conical surface of a flying vehicle can significantly reduce the volume occupied by the antenna in the forebody and to abandon the use of expensive fairing. Previous studies of such antennas (see, e.g., [1–5]), on the one hand, demonstrated the feasibility of their practical implementation and, on the other hand, posed a number of problems caused by the need to develop more adequate simulation algorithms, to take into account diffraction effects on a curved surface of the cone, and to determine the optimal structure of the radiators and their excitation that provide the required antenna characteristics. In particular, the question of the maximum directivity of a conical antenna and its dependence on the geometry of the cone and the structure of the radiators are still unclear. In particular, it was noted in [2] that the maximum directivity of a conical antenna does not exceed the directivity of the equivalent planar aperture. However, this conclusion is based on approximate methods of analysis and requires further study of the directional characteristics of conical antennas. Modern numerical methods for solving electromagnetic problems make it possible to answer the above questions with high accuracy. This study presents one of the most convenient algorithms for analyzing the characteristics of a conical AA, making it possible not only to determine the optimal characteristics of the antenna, but also formulate the requirements to individual radiators and their relative positions. The most appropriate type of radiators for the antenna under consideration are slot radiators located on the surface of a cone. Such radiators have good
mechanical strength, good aerodynamics, and the ability to work in large intervals of temperature gradient. Therefore, we investigated the capabilities of AAs consisting of slot radiators and located on a conductive conical surface and performed a full-wave simulation of the directional characteristics of such antennas. The limiting parameters of a conical antenna with a quasi-continuous distribution of excitation due to the use of elementary sl
Data Loading...
