Liquid Metal-Based Frequency and Pattern Reconfigurable Yagi Antenna for Pressure Sensing

Area of Science:

• Electromagnetics and Antenna Design
• Sensor Technology
• Materials Science

Background:

• Reconfigurable antennas are crucial for adaptive wireless systems.
• Liquid metal (LM) technology offers unique solutions for tunable electronic components.
• Existing pressure sensors may lack wireless or reconfigurable capabilities.

Purpose of the Study:

• To propose and demonstrate a novel frequency- and pattern-reconfigurable Yagi antenna.
• To utilize liquid metal (LM) switches for pressure-induced reconfiguration.
• To explore the application of this antenna in wireless pressure sensing and health monitoring.

Main Methods:

• Design of a Yagi antenna incorporating four flexible liquid metal (LM) switches.
• Investigation of the antenna's response to external pressure, affecting LM switch states.
• Analysis of frequency tuning and radiation pattern reconfiguration based on switch activation.
• Fabrication and experimental validation of the proposed antenna design.

Main Results:

• The antenna demonstrated frequency tunability from 2.28 GHz to 2.5 GHz.
• Radiation patterns were reconfigured between bidirectional end-shot and end-fired modes.
• A maximum gain of 6 dBi was achieved.
• Experimental results closely matched simulation predictions.

Conclusions:

• The proposed LM-based reconfigurable Yagi antenna effectively senses pressure.
• The antenna's frequency and radiation pattern can be dynamically altered by external pressure.
• This technology holds promise for advanced wireless pressure-sensing and health-monitoring applications.