Quasi-coaxial crack feed cavity-backed antenna

Abstract

The invention relates to the field of cavity-backed antennas, and discloses a quasi-coaxial crack feed cavity-backed antenna which comprises a step structure type symmetrical oscillator, an impedance transformer, a dielectric radome, a quasi-coaxial crack balancer, a foam layer and a circular reflection cavity. The dielectric radome is assembled on the circular reflection cavity, the symmetrical oscillator is assembled on the quasi-coaxial crack balancer, and the foam layer is arranged between the stepped structure type symmetrical oscillator and the dielectric radome and is used for fixing the relative distance between the symmetrical oscillator and the dielectric radome. According to the cavity-backed antenna provided by the invention, a quasi-coaxial crack balanced feed structure is adopted, the advantages of the traditional coaxial crack balanced feed and the double-line balanced feed are combined, and the impedance conversion and the coaxial crack structure are integrated, so that the purposes of eliminating the directional diagram distortion existing in a current popular broadband cavity-backed antenna form, improving the structural reliability and the power capacity under the high-strength condition and enabling the frequency band width to be not smaller than 3: 1 are achieved.

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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