Integrated Frequency Selective Surface and Antenna Printed on a Transparent Substrate

This letter presents an integrated design of a frequency modulation (FM) radio antenna and a band-stop frequency selective surface (FSS) printed on a thin and transparent glass substrate. The glass is enclosed by a rectangular aluminum frame. Such a structure can be readily applied to the windows of a car or building. The FSS is implemented with an array of cross dipoles printed using silver compound, which is able to prevent the penetration of incident 2.4 GHz signal. On the other hand, the FM antenna is also implemented on the same surface as the FSS. By joining 19 cross elements with conductive strips, the FM antenna forms a T-shaped monopole within the frame. The antenna is then fed by a 50 Ω coaxial probe and its 6 dB return loss bandwidth covers the entire FM radio channels from 87.5 to 108 MHz. The ingenious integration of the FM antenna and FSS is potentially very useful in applications that require both shielding and wireless communications, while maintaining the optical transparency at the same time.