MIMO antenna having plurality of isolation adjustment portions
A Multiple-Input and Multiple-Output (MIMO) antenna having a plurality of isolation adjustment portions is provided. The MIMO antenna includes a plurality of radiation elements and a plurality of isolation adjustment portions. The plurality of radiation elements is symmetrically formed on the surfaces of the left and right sides of a dielectric element having a predetermined shape, is spaced apart from each other by a predetermined distance, operates in multiple frequency bands, and includes feeding portions, respectively. The plurality of isolation adjustment portions is coupled to the plurality of radiation elements so that they have electromagnetic characteristics different from those of the plurality of radiation elements, thereby improving isolation in each of the frequency bands in which the plurality of radiation elements operate.
1. A Multiple-Input and Multiple-Output (MIMO) antenna having a plurality of isolation adjustment portions, comprising:
a plurality of radiation elements symmetrically formed on surfaces of left and right sides of a dielectric element having a predetermined shape, spaced apart from each other by a predetermined distance, and configured to operate in multiple frequency bands and to include feeding portions, respectively;
a first isolation adjustment portion formed of a metallic pattern line that connects first sides of the feeding portions included in the plurality of radiation elements, and
a second isolation adjustment portion, the second isolation adjustment portion comprising a plurality of parasitic elements formed to have a coupling structure in a one-to-one correspondence with the plurality of radiation elements with the dielectric element disposed therebetween, and a bridge formed of a metallic pattern line that connects the plurality of parasitic elements.
2. The MIMO antenna as set forth in claim 1 , wherein a length of a path of current components formed on the first isolation adjustment portion is 0.25λ of a frequency band which is a target for improvement of isolation.
3. The MIMO antenna as set forth in claim 2 , wherein the first isolation adjustment portion is formed to substantially have a sideways “U”-shaped section by bending a metallic pattern line a plurality of times.
4. The MIMO antenna as set forth in claim 3 , further comprising a second isolation adjustment portion, the second isolation adjustment portion comprising a plurality of parasitic elements formed to have a coupling structure in a one-to-one correspondence with the plurality of radiation elements with the dielectric element disposed therebetween, and a bridge formed of a metallic pattern line that connects the plurality of parasitic elements.
5. The MIMO antenna as set forth in claim 4 , wherein a length of a path of current components formed on the second isolation adjustment portion is 0.25λ of a frequency band which is a target for improvement of isolation.
6. The MIMO antenna as set forth in claim 5 , wherein the second isolation adjustment portion is substantially formed in a sideways “U” shape by cutting out any of upper and lower sides of a longitudinally central portion of a metallic plate.
7. The MIMO antenna as set forth in claim 2 , further comprising a second isolation adjustment portion, the second isolation adjustment portion comprising a plurality of parasitic elements formed to have a coupling structure in a one-to-one correspondence with the plurality of radiation elements with the dielectric element disposed therebetween, and a bridge formed of a metallic pattern line that connects the plurality of parasitic elements.
8. The MIMO antenna as set forth in claim 7 , wherein a length of a path of current components formed on the second isolation adjustment portion is 0.25λ of a frequency band which is a target for improvement of isolation.
9. The MIMO antenna as set forth in claim 8 , wherein the second isolation adjustment portion is substantially formed in a sideways “U” shape by cutting out any of upper and lower sides of a longitudinally central portion of a metallic plate.
10. The MIMO antenna as set forth in claim 1 , wherein a length of a path of current components formed on the second isolation adjustment portion is 0.25λ of a frequency band which is a target for improvement of isolation.
11. The MIMO antenna as set forth in claim 10 , wherein the second isolation adjustment portion is substantially formed in a sideways “U” shape by cutting out any of upper and lower sides of a longitudinally central portion of a metallic plate.