A reflectarray antenna based on phase delay linear reflector

Abstract

The present invention proposes a reflectarray antenna based on a phase delay line reflector, which includes a pyramidal horn feed and a reflector array, wherein the reflector array is formed by periodically arranging a number of phase delay line reflectors in a mirror-symmetrical manner. into. The phase delay line reflection unit structure is composed of two slotted circular rings nested together with two opposite phase delay lines. The invention greatly improves the gain bandwidth of the reflector array antenna, realizes the ultra-wideband antenna, and simultaneously effectively suppresses the cross polarization. Moreover, the reflectarray antenna of the present invention uses a single-layer dielectric substrate structure, so that the reflecting surface array structure is simple, easy to process, low in cost, and light in weight.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to a microstrip reflection array antenna, in particular to a reflection array antenna based on a phase delay line reflection unit. Background technique [0002] In recent years, microstrip reflectarray antenna technology has been widely used in radar and communication fields due to its outstanding advantages. However, the reflectarray antenna also has some shortcomings, the most important of which is its relatively low bandwidth. There are two reasons for the low bandwidth of the reflectarray antenna: the narrowband characteristics of the microstrip antenna unit itself and the non-constant electrical length of the path between the feed source and the reflector unit. For mid-size reflectarray antennas, the first reason is the most important. [0003] In order to overcome the shortcoming of the narrow frequency band of the reflectarray antenna, many methods have been proposed by the ...

AI Technical Summary

Problems solved by technology

Although the prior art has proposed some phase-delay linear reflectors that can improve the bandwidth of the reflectarray antenna to a certain extent (see references H.Hasani, M.Kamyab, and A.Mirkamali, "Low cross-polarization reflectarray antenna, "IEEE Trans. Antennas Propag., vol.59, no.5, pp.1752–1756, May 2011 and references R. Shamsaee and Z. Atlasbaf, "Design and implementation of a broadband singlelayer circularly polarized reflectarray antenna," IEEE Antennas WirelessPropag.Lett., vol.11, pp.973–976, 2012), but there is no obvious advantage compared to other methods of improving the bandwidth of the reflectarray antenna

The resonant structure adopted by the existing phase delay line reflector has a circular patch or ring structure, which cannot further improve the gain bandwidth of the reflect array, and also has the disadvantage of large cross-polarization components, which makes the phase delay line unit type Microstrip reflectarray antennas still have certain limitations

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