Optoelectronically reconfigurable monopole antenna
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A monopole antenna is reconfigured for 200 or 375 MHz bands by optoelectronically switching two segments together. Light levels of much less than 1 mW significantly change the antenna pattern and gain. >
[1] James L. Freeman,et al. Microwave control using a high-gain bias-free optoelectronic switch , 1991, Defense, Security, and Sensing.