Transmitarray Antenna Based on 3-D Frequency Selective Structures

Abstract

In this work, a comprehensive synthesis procedure for designing a high gain, wideband and low profile transmission array antenna, formed by three dimensional frequency selective structures (FSSs). In order to provide the phase compensating, the 3-D FSS based on stepped-impedance slotline resonators (SISRs) and slot line are designed to introduce <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$180\pm 30^{\circ}$</tex> phase difference in the range of 3.6∼6.6 GHz. The phase characteristics of multimode resonator SISR is derived. By this derivation, relationship between the phase slope and the operating frequency can be analyzed. Based on these two 3-D FSS elements, a transmitarray antenna is designed and simulated. The center frequency is around 5 GHz The profile of the transmitarray in the absence of the feeding antenna is <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$0.96\lambda_0$</tex> , where <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\lambda_0$</tex> is the free space wavelength at the center frequency. The designed transmitarray antenna has a simulated gain of 18 dB at 5 GHz.