Characteristic mode theory-based low-frequency airborne multi-antenna system and design method therefor

Abstract

The invention discloses a characteristic mode theory-based low-frequency airborne multi-antenna system and a design method therefor. The system comprises multiple low-frequency airborne antennas, an airborne platform, an excitation structure, a matching network, an excitation structure dielectric protection layer and a power division feed network. The method is characterized comprising the steps of designing a low-frequency airborne multi-antenna system with high gain and high port isolation degree systemically based on the characteristic mode theory; for the low-order mode of the airborne platform, synthesizing a target directional diagram by a multi-target optimization algorithm; and improving radiation efficiency by exciting the combined mode current. The low-frequency airborne multi-antenna system provided by the invention has the advantages of satisfying radiation performance requirement of the antennas, conformal requirement with the platform, and electromagnetic compatibility requirements among multiple antennas; and in addition, the design method is systemic and has clear explanation on physical mechanisms, and can be flexibly applied to the low-frequency multi-antenna system design of different platform structures.

Description

technical field [0001] The application belongs to the technical field of airborne antenna engineering, and in particular relates to a low-frequency airborne multi-antenna system based on eigenmode theory and a design method thereof. Background technique [0002] In the modern multi-functional integrated airborne integrated electronic system, the low-frequency (HF / VHF frequency band) airborne multi-antenna system is the key subsystem, which is widely used in medium and long-distance air-to-ground communication and NVIS (Nearly Vertical IncidentSky Wave, Near vertical incidence sky wave) short-wave communication, its performance directly affects the communication quality of the entire communication system. [0003] Since the complex electromagnetic environment on the airborne platform and the physical structure of the airframe itself will affect the radiation performance of the airborne antenna, isolated antennas with good radiation performance often deteriorate to varying deg...

AI Technical Summary

Problems solved by technology

At the same time, the resonance length of the low-frequency airborne antenna is equivalent to the size of the airframe. The low-frequency antenna is often large in size and usually installed in an exposed manner, which in turn destroys the aerodynamic characteristics of the aircraft, increases the radar cross-section of the aircraft, and is not conducive to the antenna's Mechanical Invulnerability

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