Novel broadband low-profile array antenna

Abstract

A novel broadband low-profile array antenna comprises: a waveguide slot array consisting of a plurality of segmented waveguide sub-arrays; a multi-stage rectangular coaxial impedance transformer in amulti-layer folded form, including multiple output ports, and fixedly connected to the waveguide sub-arrays through the output ports to feed respective waveguide sub-arrays; a waveguide coaxial converter connected to the input port of the multi-stage rectangular coaxial impedance transformer and used for transforming a rectangular waveguide into a SMA coaxial feed form for easy testing and application. The waveguide slot array is arranged in a straight line to expand the bandwidth of the antenna. The multi-stage rectangular coaxial impedance transformer combines the advantages of a microstripfeed network and a waveguide feed network, not only expands a bandwidth and improves in-band flatness, but also reduce insertion loss. The multi-stage rectangular coaxial impedance transformer can realize an arbitrary number of ports and an arbitrary power distribution ratio according to actual application requirements, and can uses single-stage or multi-stage impedance transformation according tobandwidth requirements. The multi-layer folded form reduces the profile.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a novel broadband low-profile 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 antenna systems, such as high gain, low sidelobe, wide frequency band, low loss performance, and low profile The design requirements of simple structure and simple structure 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 communicati...

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Problems solved by technology

However, the microstrip / stripline feed network has a large impedance discontinuity at the branch, and there is coupling between the parallel microstrip lines. For higher operating frequencies, the excessive electrical length can not be ignored. transmission loss and cause fluctuations in the power amplitude at the outlet of the fractional network; the feed structure of the waveguide network is usually simple in structure and low in loss, but relatively narrow in bandwidth

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