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Source:Original | Author:C&T RF Antennas Inc | Publish time: 2019-01-11 | 760 Views | Share:

The third is an electromagnetic lens. The lens is mainly used in high-frequency bands. When the wavelength is very small, a medium can be placed to focus. The high-frequency antenna is not large, but the wavelength of the microwave segment is very long, which makes the lens difficult to use. It will be great.

The fourth is the application of MEMS. At very low frequencies, MEMS can be used as a switch. In mobile terminals, if the antenna can be effectively controlled and reconstructed, an antenna can be used.

Taking an electromagnetic lens as an example, this design introduces a concept: an electromagnetic lens is placed in front of a multi-unit antenna array (here, a lens applied to the low-end frequency band of microwave or millimeter wave, unlike a conventional optical lens), when light When incident from an angle, spots are generated on a focal plane, which concentrates a large amount of power, which means that the main part of the entire capability is received in a small area.

 

When the incident direction changes, the position of the spot on the focal plane also changes. As shown above, when the angle is being projected, the energy distribution of the black color is generated. If it is incident at an angle θ (red color), the main energy deviates from the black color region.

This concept can be used to distinguish where the energy comes from, and the direction of incidence and the position of the energy on the array or on the focal plane are one-to-one. Conversely, if the antenna is excited at different positions, the antenna will radiate in different directions, which is also one-to-one correspondence.

If a plurality of cells is radiated on the focal plane, radiation of a plurality of carrier beams can be generated, that is, so-called beamforming; if switching between the beams, beam scanning occurs; if these antennas are used simultaneously, Massive MIMO can be implemented. This array can be large, but high gain radiation can be achieved with very few arrays per beam.

If a normal array has the same size, each time the energy is received, all the units must receive energy in this area. If only one unit is placed in a large area, the energy received is only a very small part; The difference in an array is that the same caliber can receive all the energy with only a few units without any loss. Different angles come in, and this energy can be received simultaneously in different places.