Indian scientists have developed a concept for a liquid radio antenna and tested a prototype.
Scientists have proposed a new design of a conical structure for a liquid antenna that can work effectively over a wide frequency range. According to the authors of the development in the “International Journal of Ultra-wideband Communications and Systems”, the antenna is compact and cost-effective. Scientists also proposed an easy way to reconfigure it for different applications; in the case of an all-metal antenna, this is not so easy.
In addition to the concept itself, engineers from the Siddaganga Institute of Technology in Tumakura, Karnataka, India, have confirmed the functionality of a new type of liquid antenna. They used pure fresh water, seawater, and glycerin as a liquid component. According to the authors of the development, the device can achieve a voltage standing wave ratio from 1 to 2 in the frequency range from 300 to 850 MHz. The operating frequency is regulated by changing the height of the liquid inside the cone. The antenna is 30-40% shorter than a similar metal antenna, and the radio emission from it is omnidirectional.
Solid metal antennas have been the standard in a wide range of technologies for decades. However, scientists have been studying the concept of liquids for a long time, since the 1990s.