Broadband dual-polarized microstrip array antenna

• US 6,956,528 B2
• Filed: 06/09/2001
• Issued: 10/18/2005
• Est. Priority Date: 04/30/2001
• Status: Expired due to Fees

• Current Assignee: Kwangwoon University Research Insitute Of Industry Cooperation, Mission Telecom Corporation, Pawanet, Inc.
• Original Assignee: Kwangwoon Foundation, Mission Telecom Corporation, Pawanet, Inc.
• Inventors: Lee, Hak-yong, Kang, Gi-cho, Ra, Keuk-hwan, Kim, Jong-heon, Kim, Nam-young, Lee, Byung-je, Lee, Guen-ho
• Primary Examiner(s): PHAN, THO GIA
• Application Number:
  US10/476,410
• Publication Number:
  US 20040119645A1
• Time in Patent Office: 1,592 Days
• Field of Search: 343/700.MS, 343/829, 343/846, 343/853
• US Class Current: 343/700.0MS
• 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 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.