A quasi-coaxial slot-fed cavity-backed antenna

Abstract

The invention relates to the field of cavity-backed antennas, and discloses a quasi-coaxial slot-fed cavity-backed antenna, which includes a ladder-structure symmetrical vibrator, an impedance converter, a dielectric radome, a quasi-coaxial crack balancer, a foam layer and a circular Reflecting cavity; the dielectric radome is assembled on the circular reflecting cavity, the symmetrical vibrator is assembled on the quasi-coaxial crack balancer, and the foam layer shown is arranged between the stepped structured symmetrical vibrator and the dielectric radome, with The relative distance between the fixed symmetrical vibrator and the dielectric radome. The cavity-backed antenna provided by the present invention adopts a quasi-coaxial slot balanced feed structure, combines the advantages of traditional coaxial slot balanced feed and dual-wire balanced feed, and integrates impedance transformation and coaxial slot structure into one , to achieve the purpose of eliminating the distortion of the pattern of the current popular broadband cavity-backed antenna, structural reliability under high-intensity conditions, power capacity improvement, and a frequency bandwidth of not less than 3:1.

Description

technical field [0001] The invention relates to the field of cavity-backed antennas, in particular to a quasi-coaxial slot-fed cavity-backed antenna. Background technique [0002] Cavity-backed antennas excited by dipoles currently mainly adopt several forms such as symmetrical dipoles, bow-tie dipoles, and open sleeve dipoles. The typical feeding method is two-wire balanced feeding. [0003] The radiation pattern of the broadband cavity-backed antenna excited by the bow-tie oscillator is prone to distortion at the high frequency; the structure of the cavity-backed antenna excited by the open sleeve oscillator is complex, and it is easy to be damaged under high-intensity vibration conditions. The biggest advantage of the traditional symmetrical dipole excitation cavity-backed antenna is its simple structure and low cross-polarization level. Its disadvantage is that its own bandwidth is limited, and the standing wave coefficient bandwidth is usually within 1.5:1. [0004] At...

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Problems solved by technology

[0003] The broadband cavity-backed antenna excited by the bow-tie vibrator is prone to distortion at the high frequency end; the structure of the cavity-backed antenna excited by the open sleeve vibrator is complex, and it is easy to be damaged under high-intensity vibration conditions.

The biggest advantage of the traditional symmetrical vibrator-excited cavity-backed antenna is its simple structure and low cross-polarization level. Its disadvantage is that its own bandwidth is limited, and the standing wave coefficient bandwidth is usually within 1.5:1.

[0004] At the same time, it is prone to pattern distortion at high frequency

Although the existing two-wire balancer has a simple structure and a wide bandwidth, it is limited by the cross-wire connection structure (equivalent distributed inductance) between the positive and negative poles of the vibrator, which limits the high-frequency performance of the antenna (distortion of the pattern and small power capacity )

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