A dual-polarized antenna was successfully born, which was transformed from the nine-unit aircraft antenna. The oscillator was changed into a double diamond oscillator, and the guide was made into a cross shape, which was used to receive vertical and horizontal signals in the same direction.

An antenna is a converter that converts a traveling wave propagating along a transmission line into an electromagnetic wave propagating in an unbounded medium (usually free space), or vice versa. A part of a radio device used to transmit or receive electromagnetic waves. The ratio of the total input power of the antenna, called the maximum gain factor of the antenna. It is a more comprehensive reflection of the antenna's effective utilization of the total RF power than the antenna directivity factor. In decibels. It can be proved mathematically that the maximum antenna gain coefficient is equal to the product of antenna directivity coefficient and antenna efficiency.

With a simple 5G Dual Band Combiner, the gain is about 2.2dbi. However, the two sets of antennas do not gain a total of 4.4dbi. However, they can or may support dual antenna automatic selection to improve wlan network performance through a special technique.

5G Dual Band Combiner https://www.cenrf.com/5G-2Ways-Combiner-698-2700MHz-3300-3800MHz-43F.html