Antenna device

• US 20020154062A1
• Filed: 04/24/2002
• Published: 10/24/2002
• Est. Priority Date: 08/30/2000
• Status: Active Grant

• Current Assignee: Callahan Cellular LLC (Intellectual Ventures LLC)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Fujita, Makoto, Abe, Masaaki
• Granted Patent: US 6,683,572 B2
• Time in Patent Office: Days
• US Class Current: 343/700MS
• 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 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence

Abstract

The invention provides an antenna device 1 that is small in its size but wide in its bandwidth. The recess 2a is formed in the dielectric substrate 2. The shorting electrode 5 is formed on the front surface 2d of the substrate 2 for connecting radiation electrode 3 to each of grounding electrodes 6, 7.

Claims

1. An antenna device provided with a substrate and a radiation electrode which extends two-dimensionally and is formed on a surface of or inside said substrate, characterized in that said substrate has a hollow part or a recess.

2. An antenna device as claimed in claim 1, said substrate contains a dielectric material or a magnetic material.

3. An antenna device as claimed in claim 1 or 2, characterized in that a recess extending from a front surface of said substrate to a rear surface of said substrate is formed in a lower surface of said substrate, in that first and second grounding electrodes are formed respectively on both sides of that portion of said lower surface of said substrate where said recess is formed, and in that an electrode is formed on one of said front surface and said rear surface of said substrate, said electrode connecting said radiation electrode to each of said first and second grounding electrodes.

4. A printed circuit board comprising the antenna device as claimed in any of the claims 1-3.

5. A mobile tv radio apparatus comprising the antenna device as claimed in any of the claims 1-3.