Abstract
One of the most challenging problems in recent antenna engineering fields is to achieve highly reliable beamforming capabilities in an extremely restricted space of small handheld devices. In this paper, we introduce a new perspective on single-radiator multiple-port (SRMP) antenna to alter the traditional approach of multiple-antenna arrays for improving beamforming performances with reduced aperture sizes. The major contribution of this paper is to demonstrate the beamforming capability of the SRMP antenna for use as an extremely miniaturized front-end component in more sophisticated beamforming applications. To examine the beamforming capability, the radiation properties and the array factor of the SRMP antenna are theoretically formulated for electromagnetic characterization and are used as complex weights to form adaptive array patterns. Then, its fundamental performance limits are rigorously explored through enumerative studies by varying the dielectric constant of the substrate, and field tests are conducted using a beamforming hardware to confirm the feasibility. The results demonstrate that the new perspective of the SRMP antenna allows for improved beamforming performances with the ability of maintaining consistently smaller aperture sizes compared to the traditional multiple-antenna arrays.
Highlights
The use of arrays with multiple antennas has become essential for adaptive beamforming in advanced wireless communication systems
To examine the fundamental performance limits related to these array manifolds, the aperture sizes of both the single-radiator multiple-port (SRMP) antenna and the multiple-radiator multiple-port (MRMP) array are scaled by increasing the value of εr from 2 to 36, and beamforming performance is evaluated through enumerative studies
We have introduced a new perspective on the SRMP antenna as an innovative approach to the miniaturization of aperture size with improved beamforming performance in an extremely small aperture area
Summary
The use of arrays with multiple antennas has become essential for adaptive beamforming in advanced wireless communication systems. Arrays are used to adjust the direction of beams and nulls by multiplying complex weights to antenna ports for more reliable communication links in a multipath environment. This beamforming capability can be extended to estimate the direction of signals and mitigate the effects of interference; a growing demand for more effective beamforming capability in handheld devices with limited space has led to several technical challenges from an antenna engineering standpoint.
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