Broadband dual-polarized microstrip array antenna

• US 20040119645A1
• Filed: 10/30/2003
• Published: 06/24/2004
• Est. Priority Date: 04/30/2001
• Status: Active Grant

• Current Assignee: Kwangwoon University Research Insitute Of Industry Cooperation, Mission Telecom Corporation, Pawanet, Inc.
• Original Assignee: Kwangwoon University Research Insitute Of Industry Cooperation
• Inventors: Lee, Hak-yong, Ra, Keuk-hwan, Kim, Jong-heon, Kim, Nam-young, Lee, Guen-ho, Kang, Gi-cho, Lee, Byung-je
• Granted Patent: US 6,956,528 B2
• Time in Patent Office: Days
• US Class Current: 343/700MS
• CPC Class Codes: H01Q 21/065 Patch antenna array
• CPC Class Codes: H01Q 9/0457 electromagnetically coupled to the feed line

Abstract

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.

Claims

1. A broadband dual-polarized microstrip array antenna generating two polarizations by using transmission path, said two polarizations are generated by a separate transmission path respectively 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 a different film layers each other.

3. The array antenna as set forth in claim 1, wherein said array antenna uses a parallel feeding method.

4. The array antenna as set forth in claim 3, wherein said array antenna comprises:

a first film coated with a metal on the upper side and plurality patch elements are arranged with a uniform array shape;

a closed region formed on the center of said first film;

a patch antenna formed on the center of said closed region, said patch antenna generating a radiation by a 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 the 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 the current inputted from the outside;

a second styrofoam formed under said second film;

a third film under said second styrofoam, wherein a slot is formed at the corresponding position to each patch antenna for electromagnetic wave 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 patch antenna through said slot in accordance with the current inputted from the outside;

a fourth styrofoam formed under said fourth film;

a thin metal plate formed under said fourth styrofoam.

5. The array antenna as set forth in claim 4, wherein said each power supplying layer using a strip line in order to reduce an energy loss arisen from the power supplying part.

6. The array antenna as set forth in claim 5, wherein said power supplying part and the patch element are coupled electro-magnetically and operate as an antenna.

7. The array antenna as set forth in claim 6, wherein one of said two polarization is generated by a patch element using the proximity feeding type and radiated at the parallel feeding part by said patch element and the other polarization is generated by a patch element using the aperture feeding type and radiated through the slot of the electromagnetic wave generating from the parallel feeding part by said patch element.

8. The array antenna as set forth in claim 7, wherein said second film and fourth film are arranged perpendicularly each other on the horizontal planes formed by said first to said fourth styrofoam.