ANTENNA DEVICE

• US 20090046029A1
• Filed: 08/04/2006
• Published: 02/19/2009
• Est. Priority Date: 12/12/2005
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Nagai, Shuichi
• Granted Patent: US 7,839,350 B2
• Time in Patent Office: Days
• US Class Current: 343/850
• CPC Class Codes: H01P 1/2135 using strip line filters H01P1/2131 takes precedence
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 21/06 Arrays of individually energised antenna units similarly polarised and spaced apart
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H01Q 9/045 with particular feeding means for circular polarisation H01Q9/0428

Abstract

An antenna device according to the present invention includes; a plurality of antenna elements; a line which is electro-magnetically connected to each of the antenna elements and is branched from at least one branch point in the line; and filters formed in the line between a first branch point and each of said plurality of antenna elements. Here, the first branch point is the electrically farthest branch point from each of the antenna elements among all branch points.

Claims

1. An antenna device comprising:

a plurality of antenna elements;

a line electro-magnetically connected to each of said plurality of antenna elements, said line being branched from at least one branch point in said line; and

filters formed in said line between (i) a first branch point and (ii) each of said plurality of antenna elements, the first branch point being the electrically farthest branch point from each of said plurality of antenna elements.

2. The antenna device according to claim 1,

wherein said plurality of antenna elements are formed on a substrate,

said line is formed on said substrate, and

said filters are formed on said substrate.

3. The antenna device according to claim 2,

wherein each of said plurality of antenna elements is a microstrip antenna formed on a surface of said substrate,

said line is a microstripline formed on the surface of said substrate, and

each of said filters is a microstrip filter formed on the surface of said substrate.

4. The antenna device according to claim 2,

wherein said substrate is a multilayer substrate, and

said filter is a stack filter.

5. The antenna device according to claim 1,

wherein said line has a plurality of the branch points, and

said filters include a first filter and a second filter,

wherein said first filter is inserted in said line between a second branch point and the first branch point, the second branch point being different from the first branch point, and

said second filter is inserted in said line between the second branch point and each of said plurality of antenna elements.

6. The antenna device according to claim 1, further comprising

a wave absorber formed above one of said line and said filter.

7. The antenna device according to claim 1, further comprising

a photonic crystal structure formed above one of said line and said filter.

8. The antenna device according to claim 6, further comprising

an insulation layer between (i) one of said line and said filter and (ii) said wave absorber.

9. An antenna device comprising:

an antenna element formed on a surface of a substrate;

feed line electro-magnetically connected to said antenna element;

a filter electro-magnetically connected to said feed line; and

one of a wave absorber and a photonic crystal structure formed above one of said line and said filter.

10. The antenna device according to claim 9, further comprising

an insulation layer between (i) one of said feed line and said filter and (ii) one of said wave absorber and said photonic crystal structure.