Broadband dual-polarized microstrip array antenna
View Patent ↗This invention relates to a microstrip array antenna, especially a broad-band dual-polarized microstrip array antenna having parallel feeding structure whose consist of two parts power supplying layers each of which generates its own polarization respectively. And the broad-band dual-polarized microstrip array antenna according to the present invention arranges transmission paths for two separate linear polarization on a different layer each other in order to minimize an interference effect and a proximity feeding method and an aperture coupled method are used in order to get two separate polarization.
1. A broadband dual-polarized microstrip array antenna generating two polarizations by using a transmission path, comprising:
a first film coated with metal on an upper side and a plurality of patch elements arranged with a uniform array shape;
a closed region formed in the center of said first film;
a patch antenna formed in the center of said closed region, said catch antenna generating radiation by resonance in said closed region;
a first styrofoam formed under said first film;
a second film forming a proximity feeding excitation transmission line, said second film formed under said first styrofoam and connected in parallel to a bottom side of said first film excepting said closed region, said second film generating a first polarization by exciting each patch antenna in accordance with input current;
a second styrofoam formed under said second film;
a third film under said second styrofoam, wherein a slot is formed at a position corresponding to each patch antenna for electro-magnetic waves to pass through;
a third styrofoam formed under said third film;
a fourth film formed under said third styrofoam, wherein transmission lines for aperture feeding excitation are formed on said fourth film and are connected in parallel to each other and generate a second polarization by exciting each catch antenna through said slot in accordance with the input current;
a fourth styrofoam formed under said fourth film; and
a thin metal plate formed under said fourth styrofoam,
wherein said two polarizations are generated by a separate transmission path respectively using a parallel feeding method in order to reduce interference between said two polarizations.
2. The array antenna as set forth in claim 1 , wherein said separate transmission path is formed on different film layers with respect to each other.
3. The array antenna as set forth in claim 1 , wherein a power supplying layer uses a strip line in order to reduce energy loss arising from a power supplying part.
4. The array antenna as set forth in claim 3 , wherein said power supplying part and the patch elements are coupled electro-magnetically and operate as an antenna.
5. The array antenna as set forth in claim 4 , wherein one of said two polarizations is generated by a patch element using proximity feeding excitation and radiated at a parallel feeding part by said patch element and the other polarization is generated by a patch element using aperture feeding excitation and radiated through the slots of the third film.
6. The array antenna set forth in claim 5 , wherein said second film and said fourth film are arranged perpendicular each other on horizontal planes formed by said first styrofoam to said fourth styrofoam.