Energy Saving Glazing and Its Compatibility with Heating, Antenna and Wireless Communication 2019-01-1057
Conductive heat reflecting automotive windows has been used to increase passenger comfort and improve fuel efficiency. Despite the many benefits, there is a subsequent problem with the use of such technology: the conductive coating can block the transmission of RF signals. As a result, the use of such window can severely limit or prevent the transmission of RF signals into and out of the vehicles. A number of methods are available to maintain electromagnetic compatibility and the function of these and other devices in the passenger compartment, while accruing the heat load reduction benefits of the coating. One of the methods is to integrate antennas on to the coated glazing and the have glass antenna acting as a communication interface between inside and outside of a the vehicle. Antennas such as AM, FM, DAB, RKE and TV have been commercialized and successfully integrated into transparent coating with aesthetical improvement since the antennas are invisible. Transparent high frequency antennas such as mobile phone, Bluetooth, GPS, Wi-Fi, V2V and V2I can also be incorporated into transparent coating. Another approach is to design a wideband or bandpass Frequency Selective Surface (FSS) window to facilitate wireless communication while preserving the thermal quality performance of the window. This paper provides detailed overview on coated antennas for low frequency and high frequency, FSS window design for wideband and bandpass applications and coated antenna combined with de-ice and de-fogger functions with some designs and testing data.
David Dai, MUKESH RUSTAGI, Peter Dishart