Decoupling design of quad polarization patch antenna using neutralization bridge

When antennas are used in a small area, there is a problem that the mutual coupling between the antennas becomes large. In order to reduce the mutual coupling, we consider the neutralization bridge, in which the feeding points are connected by bridges to cancel the currents on each other's antennas. Decoupling structures using suspended bridges are difficult to fabricate then we design and evaluate decoupling structure embedded in dielectric substrate for easy fabrication.