Co-located dipoles with mutually-orthogonal polarization
An antenna system with co-located dipole antennas with mutually-orthogonal polarization is disclosed herein. The two antennas have planar geometry for the entire antenna and the two antennas are co-located in two mutually-orthogonal planes which provides an antenna solution for wireless communications with high isolation between the two antennas and polarization diversity in a minimum volume occupied. The two antennas operate in the same wireless communications band or in different bands.
1. An antenna system with co-located dipoles with mutually-orthogonal polarization, the antenna system comprising:
a vertical dipole antenna comprising a dielectric substrate, a plurality of dipole arms, an antenna balun, a metallization section and a feed point;
a horizontal dipole antenna comprising a dielectric substrate, a plurality of dipole arms, an antenna balun, a metallization section and a feed point;
wherein the vertical antenna and the horizontal antenna are co-located in two mutually-orthogonal planes;
wherein a first dipole arm of the plurality of dipole arms of the vertical dipole antenna is located on one side of the horizontal dipole antenna and a second dipole arm of the plurality of dipole arms of the vertical dipole antenna is located on an opposing side of the horizontal dipole antenna;
wherein a first dipole arm of the plurality of dipole arms of the horizontal dipole antenna is located on one side of the vertical dipole antenna and a second dipole arm of the plurality of dipole arms of the horizontal dipole antenna is located on an opposing side of the vertical dipole antenna;
wherein the antenna balun of the vertical dipole antenna engages the antenna balun of the horizontal dipole antenna.
2. The antenna system according to claim 1 wherein the two antennas operate in the same wireless communications band or in different bands.
3. The antenna system according to claim 1 wherein the two antennas are fed via coaxial cables or via transmission lines.
4. The antenna system according to claim 1 wherein the two antennas are made of metallization on dielectric substrates of a sheet metal.
5. The antenna system according to claim 1 wherein the location of the first antenna and the second antenna in two mutually-orthogonal planes provides an antenna solution for wireless communications with high isolation between the first antenna and the second antenna, and polarization diversity in a minimum volume occupied.
6. An antenna system for multiple-input-multiple-output (MIMO) communication, the antenna system comprising:
a first dipole antenna comprising a dielectric substrate, a plurality of dipole arms, an antenna balun, a metallization section and a feed point; and
a second dipole antenna comprising a dielectric substrate, a plurality of dipole arms, an antenna balun, a metallization section and a feed point;
wherein the first dipole antenna and the second dipole antenna are co-located with mutually-orthogonal polarization,
wherein a first dipole arm of the plurality of dipole arms of the first dipole antenna is located on one side of the second dipole antenna and a second dipole arm of the plurality of dipole arms of the first dipole antenna is located on an opposing side of the second dipole antenna;
wherein a first dipole arm of the plurality of dipole arms of the second dipole antenna is located on one side of the first dipole antenna and a second dipole arm of the plurality of dipole arms of the second dipole antenna is located on an opposing side of the first dipole antenna;
wherein the antenna balun of the first dipole antenna engages the antenna balun of the second dipole antenna.
7. The antenna system according to claim 6 wherein the first dipole antenna lies in a horizontal plane and the second dipole antenna lies in a vertical plane extending outward from the first dipole antenna.
8. The antenna system according to claim 7 wherein the first dipole antenna operates in a first communication band ranging from 2.4 to 2.49 GigaHertz (GHz), and the second dipole antenna operates in a second communication band ranging from 5.15 to 5.85 GHz.
9. The antenna system according to claim 7 wherein the first dipole antenna operates in a first communication band ranging from 2.4 to 2.49 GHz, and the second dipole antenna operates in a second communication band ranging from 2.4 to 2.49 GHz.
10. The antenna system according to claim 7 wherein the first dipole antenna operates in a first communication band ranging from 5.15 to 5.85 GHz, and the second dipole antenna operates in a second communication band ranging from 5.15 to 5.85 GHz.
11. The antenna system according to claim 7 wherein the first dipole antenna operates in a first communication band ranging from 5.15 to 5.85 GHz, and the second dipole antenna operates in a second communication band ranging from 2.4 to 2.49 GHz.