A novel cumulant based MUSIC like DOA estimation algorithm for multicarrier modulation has been proposed in this paper. While the conventional MUSIC algorithm is not applicable to a correlation matrix calculated from received signals transmitted over the different carriers, the proposed algorithm can estimate the DOA of the signals with multicarrier modulation. The proposed algorithm does not require the sensor array responses for the frequency range of the interest and the initial phases of the carriers. With the proposed algorithm the number of signals whose DOA are estimated can be increased and the accuracy of the DOA estimation can be improved by employing larger number of carriers.

A Radial Line Slot Antenna (RLSA) is a high gain planar antenna for receiving DBS (satellite TV) in 12 GHz band. To suppress grating lobes from the array, a slow wave structure is installed in the upper waveguide of RLSA. This letter proposes a novel slow wave structure filled up with expanded polyethylene. The basic design and the performances of the antenna are summarized. The measured gain of 36.3 dBi and efficiency of 75% at 12 GHz confirms the potential of this slow wave structure.