Design of compact WCDMA indoor repeater antenna with high isolation using metamaterial absorber

This paper proposes a novel design for a high isolation WCDMA repeater antenna, which consists of a main patch, parasitic patch, and metamaterial absorber. The required WCDMA bandwidth is obtained by utilizing the coupling between the main and the parasitic patches. In addition, high isolation is achieved using the metamaterial absorber, which has a volume of 12 mm × 12 mm × 1.2 mm and absorption of about 98 %. Parasitic patch is composed of two rectangular patches for high gain. The proposed antenna has a gain of over 8 dBi, a voltage standing wave ratio (VSWR) of less than 2, more than 85 dB of isolation between the service and donor antennas over the WCDMA band, and a total volume of the proposed WCDMA indoor repeater antenna only 70 mm × 70 mm × 43.8 mm.