Compact Time-Modulated Reconfigurable Antenna for Anti-Jamming IoT Communications

Le résumé fourni par la source

Reliable anti-jamming capability is a critical requirement for Internet of Things (IoT) devices operating in dense and interference-prone wireless environments, where spectrum congestion and co-channel interference can severely degrade communication quality. This paper presents a compact time-modulated phase-center reconfigurable antenna (PCRA) that achieves high-precision null steering while maintaining a small form factor suitable for resource-constrained IoT applications, by employing a periodic time-modulation technique to dynamically switch among multiple radiation states with distinct phase centers but nearly identical amplitude patterns. This mechanism enables angular resolution of 1° in null steering and mitigates the limitations of conventional reconfigurable antennas and beamforming arrays, which often suffer from hardware nonlinearity and restricted discrete states, thereby providing enhanced flexibility in spatial interference control. A prototype was fabricated and experimentally validated under quadrature phase-shift keying (QPSK) modulation, demonstrating an interference rejection ratio exceeding 20 dB, constellation and eye diagrams, together with bit error rate and error vector magnitude measurements, further confirmed the improvement in communication robustness. With its compact footprint, low implementation complexity, and effective anti-jamming capability, the proposed PCRA offers a promising hardware solution for emerging IoT scenarios, including smart homes, UAV-enabled networks, and intelligent transportation systems.

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