A 2.4 GHz Switched Beam Antenna for Indoor Applications Using Angle of Arrival Estimation

Reham Elsamnty, Ahmed Mohamed Attiya, Esmat Abdel Fattah Abdallah, Abdel Hadi Ammar
2016 Open Journal of Antennas and Propagation  
This study introduces a new design of planar antenna array for ISM band applications at 2.4 GHz. This prototype is switched beam antenna, namely planar antenna with four meandered slotted triangular elements (PAFMSTE), which is proposed for wireless indoor applications. The Base Station (BS) equipped with this planar antenna is preferred to be at the center position on the room ceiling to cover all sectors of the room. It is designed to use four directional triangular elements arranged to form
more » ... s arranged to form a square planar antenna array. The PAFMSTE is used to obtain optimal directivity in four directions in azimuth plane with 3 dB beamwidth of 90˚ at a specific orientation of 30˚ in elevation plane. Switched parasitic technique is used to enable PAFMSTE to steer a directional beam through four locations by using four PIN diodes switches. The High Frequency Structure Simulator (HFSS) is used as an efficient simulation tool to optimize the performance of the PAFMSTE antenna. The fabrication and measurements of the PAFMSTE antenna are introduced. The proposed antenna enable radio positioning via Angle of Arrival (AOA) information collected from nearby devices. Then, the Cramér-Rao Bound (CRB) is presented for AOA estimation using identically and equally spaced antenna elements. The CRB depends on the directivity, where the maximum values of CRB are 1.35 × 10 −3 and 8 × 10 −3 at HPBW of 60˚ and 90˚, respectively.
doi:10.4236/ojapr.2016.43008 fatcat:jr6g4ndyvvhehhtuehxx4nrfk4