In this letter, we propose a two-row electronically steerable parasitic array radiator antenna designed for direction-of-arrival (DoA) estimation in Internet of Things (IoT) applications relying on simple microcontrollers. The is capable elevation and azimuth beam switching using microcontroller-oriented steering circuit, provides 18 directional radiation patterns, which can be grouped 3 distin...

This paper overviews our recent research on adaptive beamforming of reactively controlled array as a nonlinear spatial filter with variable parameters, which forms both beam and nulls. The learning rate schedule is examined with respect to output SINR, convergence, stability, misadjustment, noise effect etc. Our theoretic study, simulation results and performance analysis show that such kind of...

Beamspace MIMO (BS-MIMO) systems have been recently proposed as a means to address the two key weaknesses of conventional MIMO systems: the antenna size and the need for multiple RF chains. BS-MIMO transmission is supported by the Electronically Steerable Passive Array Radiators (ESPAR) with a single active and multiple parasitic elements. The main objective is to develop efficient MIMO multipl...

A planar phased-array antenna has been constructed from a 15x15 square grid of z-directed monopoles with a length of 0.475 λ, element spacing of 0.29 λ, average directivity of 20.0 dBi across all scan angles, an average H-plane HPBW of 37 degrees, an average E-plane HPBW of 23 degrees, and an efficiency of 99.6%. Two current distributions are tested: uniform and binomial. The binomial current d...

This work examines the ability of a special type smart antenna array known as Switched Active Parasitic Antenna (SASPA) to produce directive and electronically steerable radiation pattern. The SASPA consists elements that are switchable between active parasitic states by using P-Intrinsic-N (PIN) diodes. element is supplied radio frequency while short-circuiting terminals an in results element....

In the context of ad hoc networks, use of directional antenna can largely reduce the radio interference, thereby improving the utilization of wireless medium and consequently the network throughput. However, in order to fully exploit the capability of directional antenna, whenever a source and a destination engage in a communication, all the neighbors of source and destination nodes should know...