Design of SPA Antenna Using FET Switch for 2.6 GHz

Abstract

GHz에서 전후방비가 15 dB 이상이며, 스위칭에 따라서 8방향으로 빔 조향이 가능하다. AbstractIn this paper, a 2.6 GHz switched parasitic array(SPA) antenna is designed to resolve the device interference in the femtocell. The designed SPA antenna structure consists of a central λ/4 monopole antenna as a radiator and surrounding four parasitic elements operating as a reflector or a director depending on the switching state. In addition, open state monopoles around the parasitic elements are placed to improve the directivity. The designed antenna utilizes RF FETs as switching elements instead of conventional PIN diodes, which enables beam steering with a simple structure consuming low power. To select the proper FET switch, the performance of the SPA antenna depending on the switch characteristics is analyzed. The fabricated antenna has 65 mm radius and 35 mm height, which shows about 15 dB front-back-ratio(FBR) at 2.6 GHz and enables eight-directional beam steering.

4 Port Mobile Phone MIMO Antenna for the Femtocell Communications

“…The reason for this is that it is difficult to obtain diversity gain since the difference between incoming signals is not large. Accordingly, several studies using 4 port antennas in the base station are in progress [8,9]. However, research on the multi-port broadband MIMO antenna for use in mobile phones under femtocell communications still need to be performed.…”