Novel LTCC broadband circularly-polarized micro-strip patch array antenna

Abstract

The invention belongs to the technical field of antennas, and particularly relates to a novel LTCC broadband circularly-polarized micro-strip patch array antenna which is used for overcoming the disadvantages of an existing circularly-polarized micro-strip patch array antenna in the aspect of giving consideration to low profile, circular polarization, high gain and broad band. The antenna comprises a grounding metal layer, a lower dielectric substrate, a lower metal patch antenna, an upper dielectric substrate and an upper metal patch antenna which are laminated in sequence from bottom to top, wherein the upper metal patch antenna is composed of a plurality of upper metal patch units in array arrangement; the lower metal patch antenna is composed of a plurality of lower metal patch units in array arrangement; the upper metal patch units and the lower metal patch units adopt chamfered square metal patches with the same dimensions, and rectangular grooves are formed in chamfers; rectangular gaps are formed in four sides of each upper metal patch unit; and rectangular gaps are also formed in other three sides, except the feed side, of each upper metal patch unit. The antenna is smaller in dimensions, higher in gain, better in circular polarization performance and wider in frequency bandwidth under the restriction of same array element number.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a novel LTCC wideband circularly polarized microstrip patch array antenna. Background technique [0002] Microstrip array antenna is a part of radar system that transmits and receives electromagnetic waves, and its performance directly affects the accuracy of radar detection results. Therefore, for radar systems, the design of array antenna is particularly important. Compared with the array radiation unit, the array antenna has higher gain, narrower beam, stronger directivity and spatial beam scanning characteristics. The circularly polarized antenna has the orthogonality of rotation; it can receive incoming waves with any polarization, and its radiated waves can also be received by any polarization antenna; the circularly polarized wave is incident on a symmetrical target, and the reflected wave is anti-rotated. Therefore, the circularly polarized microstrip patch ...

AI Technical Summary

Problems solved by technology

[0003] However, the input impedance of the microstrip patch antenna is very sensitive to changes in frequency, resulting in a very narrow impedance bandwidth; the current common methods of widening the microstrip patch antenna include increasing the thickness of the substrate, using a multi-layer structure, and additional impedance matching. But these are not only not conducive to the miniaturization of the antenna, but also make the antenna structure more complicated

In addition, in realizing the circular polarization of the microstrip patch antenna, there are currently common methods of using multiple feeds and patch angle cutting, but the former increases the complexity of the antenna structure and reduces the gain of the antenna, and the latter has a negative impact on the antenna. Higher dimensional accuracy requirements for patch cut corners

The contradiction between circularly polarized microstrip patch array antenna and its low profile, circular polarization, high gain, and wide frequency band has not been well resolved.

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