Frequency-scanning antenna array based on CRLH-TL

Abstract

The invention provides a frequency-scanning antenna array based on a CRLH-TL (composite right / left -handed transmission line) and belongs to the field of microwave technology. The antenna array comprises a feed network and unit antennas, wherein the feed network comprises CRLH-TLs and a matching network, and both the CRLH-TLs and the matching network are made of copper-clad media plates; a coupled line, lambada / 4 impedance transformers and single stubs are molded on a metal layer on the upper surface of each media plate and connected with a grounding plate on the lower surface of each media plate through metallized through holes. Every unit antenna is a micro-strip feed type quasi-yagi antenna made of a copper-clad media plate, and comprises a half-wave dipole antenna and two directors. The frequency-scanning antenna array realizes the CRLH-TL structure through the coupled line and can greatly reduce the leaky wave radiation in a feed network and increase the scanning range of the antenna array. Since non-uniform feeding to the unit antennas is realized through the matching network, the antenna array is endowed with the characteristics of high gain and low sidelobe.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to a frequency-sweeping antenna array, in particular to a low-leakage, low-sidelobe frequency-sweeping antenna array based on a left-handed left-hand composite transmission line of coupled lines. Background technique [0002] Left-Hand Material, also known as double negative medium or negative refractive index material, is a kind of material with both negative permittivity and negative magnetic permeability in a certain frequency band. The idea of ​​left-handed materials was first proposed by the former Soviet Union V.G. Veselago (V.G. Veselago, The electrodynamics of substances with simultaneously negative value of ε and μ. Soviet Physics, 1968, 10(4): 509-514), when electromagnetic waves propagate in left-handed materials , the electric field, magnetic field and wave vector satisfy the left-handed spiral relationship, and the phase velocity is opposite to the energy flow directio...

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Problems solved by technology

[0006] The technical purpose of the present invention: in order to solve the problems of large volume, large insertion loss and small scanning angle of the traditional slow wave structure frequency scanning antenna array; also in order to solve the problem of using interdigitated capacitance to form a left and right hand transmission line structure as the feed network leakage of the antenna array The problem of large radiation and poor low-frequency characteristics; and to improve the gain of the antenna array and reduce the side lobe level, the invention provides a new type of frequency-swept antenna array based on the coupled line left and right hand composite transmission line

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