A region in a metallic panel that facilitates the transmission of radio frequency
signals. The metallic panel may be included in a window such as the window of a
vehicle or building. For example, the metallic panel may be used for heating or
to reflect infrared radiation. An aperture is formed in the metallic panel to enable
radio frequency signals to be transmitted through the metallic panel. The design
of the aperture may be selected to enable the transmission of the desired frequency
band. In an embodiment in which the metallic panel is used to conduct electric
current, the aperture may be oriented such that the current may flow between the
openings of the aperture. Accordingly, there may be uniform heating across the
metallic panel without blocking the transmission of radio frequency signals in
the desired frequency band.
