Novel broadband array antenna

Abstract

The invention discloses a novel broadband array antenna, and the antenna comprises a polarization grid, an oscillator antenna and a waveguide feed network, wherein the polarization grid is a metal strip fixed on the feed network; the oscillator antenna is composed of two L-shaped metals which are respectively positioned in the center of the long side of the rectangular waveguide of the feed network; the waveguide feed networks are formed by cascading single-ridge to rectangular waveguide HT type power dividers and single-ridge waveguide HT type power dividers, in order to compress the longitudinal size of the waveguide feed networks, a folded waveguide structure is introduced, and the two feed networks are symmetrically arranged and are respectively excited by a single-ridge waveguide. Thenovel broadband array antenna is designed in a mechatronics mode, the HT type cascade waveguide feed network of a broadband structure is adopted to achieve broadband performance, the feed loss is greatly reduced compared with a medium transmission line, the single ridge waveguide and a folding structure are selected, the three-dimensional size of the array antenna is reduced, and the use requirement of a one-dimensional large-angle scanning system is met; and a polarization gate is introduced to suppress a vertical polarization component generated by the rectangular waveguide port.

Description

technical field [0001] The invention relates to the technical field of array antennas, in particular to a novel broadband array antenna. Background technique [0002] In recent years, with the development of modern radar communication and electronic countermeasure technology, many military and civilian fields have put forward more and more stringent requirements for antennas, high gain, low sidelobe, wide frequency band, low loss performance, and simple and convenient structure. Engineering design requirements have become the tireless pursuit of many scholars at home and abroad. [0003] The waveguide slot array antenna benefits from its compact structure, high radiation efficiency, large power capacity, and easy control of aperture distribution. Especially, the ridge waveguide slot antenna can expand the frequency bandwidth and reduce the antenna size to a certain extent, so it is widely used. In many radar systems and microwave communications that require narrow beams and...

AI Technical Summary

Problems solved by technology

However, for the microstrip / stripline feed network, for higher operating frequencies, the excessive electrical length will cause non-negligible transmission loss and cause fluctuations in the power amplitude at the outlet of the sub-network.

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