Millimeter-Wave Filtering Reflectarray for High-Gain Antenna Applications

Abstract

This paper proposes a new concept of high-gain filtering reflectarray antenna operating at millimeter-wave (mmW) frequencies. Two-section metal waveguide element is used as the reflectarray unit cell. Taking advantage of the high-pass filter nature of the waveguide structure, the reflectarray elements can provide desired reflection coefficients in the targeted band of interest yet deteriorating reflection phase and amplitude responses at lower and upper out-of-band frequencies, respectively. Therefore, the proposed reflectarray can realize filter-like frequency response by controlling the aperture amplitude and phase distributions. The antenna has been fabricated by low-cost 3-dimentional (3-D) printing technique followed by metal coating. Both simulated and measured results are presented to verify its radiating and filtering functions.