International Symposium on Telecommunication (IST)

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Three Degrees of Freedom Cells and a Perforated Dielectric for Wideband Reflectarray Fabrication

Authors :

Mahdieh Bozorgi¹ Mahmood Rafaei-Booket² Soroosh Ghaffari³

1- Faculty of Electrical and Computer Enginnering University of Zanjan Zanjan, Iran 2- Faculty of Electrical and Computer Enginnering University of Zanjan Zanjan, Iran 3- Faculty of Electrical and Computer Enginnering University of Zanjan Zanjan, Iran

Keywords :

Reflectarray،Wideband antenna،Inexpensive antenna،Perforated dielectri،Triangulr Bowtie element

Abstract :

A self-covered, single-layer, inexpensive wideband reflectarray antenna is proposed using a class of Triangular Bowtie (TB) elements printed on interior side of a periodically perforated dielectric. Such an element has three degrees of freedom (air hole, angle, and length). Drilling periodic air holes within thick FR4 dielectric, the loss of unit cell is decreased. By changing the values of length, and angle of TB patch, two different phase diagrams are obtained that the sum of their ranges is more than 700°. With the help of such a unit cell, a center-fed reflectarray is designed and simulated. To validate the simulated results, a 270×270×3.9mm3 array with focal length 26.1cm is implemented and exactly tested. The achieved results by measuring reveal a bandwidth of 42.6% (9.7~14.9GHz) for 1-dB gain, and peak gain value 29.1dB with maximum efficiency 58% at central frequency 12GHz