proximity coupled microstrip antenna
Electromagnetically coupled (EMC) designs such as proximity coupled and aperture fed antennas have many advantages over end fed and coaxial fed antennas. Some advantages include:
• No physical contact between feed line and radiating element.
• No drilling required.
• Less spurious radiation.
• Better for array configurations.
• Good suppression of higher order modes.
• Better high frequency performance.
A proximity-coupled antenna consists of two layers: it has a feed layer which is just a 50Ω microstrip line with a backing ground plane and the upper layer is the main radiating patch.