Single-layer, Low-cost, and Broadband Reflectarray Antenna Using Inhomogeneous Dielectric and a Class of Cross Bow-tie Elements

Document Type : Original Article

Authors

Faculty of Electrical and Computer Engineering, University of Zanjan, Zanjan, and Iran.

Abstract

In this paper, a class of low-cost, and single-layer reflectarray antenna is proposed for X-band in which an array of cross bow-tie patches is printed on an inhomogeneous substrate. Such an inhomogeneous substrate is made up periodic air-holes drilled within FR4 dielectric. In analyzing the unit cell of such a structure, two different parameters of cross bow-tie patch (length and angle) are varied and a phase range close to 700o is obtained that is a good choice for designing a broadband reflectarray. In the design procedure, an efficient phase synthesis technique is applied to minimize the adverse effects of frequency dispersion causing by the differential space phase delay at different frequencies. This technique optimizes the metallization arrangement, and helps to design a reflectarray with a good frequency response. To validate the obtained numerical results, a 270×270×2.4mm3 reflectarray with focal length 26.9cm is fabricated and measured. Measurements show a peak gain 28.1dB with a 1.5-dB gain bandwidth of 34% and maximum efficiency 57.5%. It is experimentally shown that the gain and bandwidth of the reflectarray with inhomogeneous dielectric is better than homogeneous one.

Keywords

References

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TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Volume 52, Issue 3 - Serial Number 101
October 2022
Pages 147-156

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