With the popularization of 5G technology, optimizing the dielectric properties of silicone rubber for high-frequency communications has become critical. Through molecular design and filler modification, low-loss and high-wave-transparent materials can be achieved.

1. Low-Dielectric-Loss Silicone Rubber

Fluorine-containing silicone rubber was synthesized, with fluorine atoms reducing molecular polarity. At 15 mol% fluorine content, the material exhibited a dielectric constant of 2.8 and a loss factor of only 0.002 at 10 GHz, outperforming traditional silicone rubber (loss factor 0.01). This material has been applied to 5G radomes, reducing signal attenuation by 3 dB.

2. Frequency Selective Surface (FSS) Integration

A composite of silicone rubber and metal grids was prepared to create an FSS structure with band-pass filtering capabilities. In the C-band (4-8 GHz), insertion loss was <1 dB and isolation >20 dB, suitable for EMI suppression in base station antennas.

3. Flexible Transmission Line Materials

A high-dielectric-constant silicone rubber (ε=10) was developed, and silver nanowire circuits were fabricated using laser direct writing. The transmission line achieved a characteristic impedance of 50 Ω and insertion loss of only 0.5 dB/m at 10 GHz, applicable to T/R components in flexible phased array radars.



Low compression set precipitated silicone rubber