Planar monopole antenna of dual frequency

• US 20040196187A1
• Filed: 04/01/2003
• Published: 10/07/2004
• Est. Priority Date: 04/01/2003
• Status: Active Grant

• Current Assignee: D-Link Corporation
• Original Assignee: D-Link Corporation
• Inventors: Yeh, Ming-Hau
• Granted Patent: US 6,822,610 B2
• Time in Patent Office: Days
• US Class Current: 343/700.0MS
• 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 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• 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 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

This invention is to provide a planar monopole antenna operable at two different frequency ranges comprising a patch line printed on a top of a dielectric substrate and having one end formed as a signal feed point; a ground metal plate printed on a bottom of the dielectric substrate; a first radiating element extended from the other end of the patch line beyond the ground metal plate and being perpendicular to the patch line and then further extended a predetermined distance in a direction parallel to the patch line toward and spaced apart from the ground metal plate; and a second radiating element operated at a high frequency projected from a side of the patch line beyond the ground metal plate and spaced apart from the first radiating element operated at a low frequency.

Claims

1. A planar monopole antenna operable at two different frequency ranges comprising:

a dielectric substrate;

a patch line printed on a top of the dielectric substrate, the patch line having one end formed as a signal feed point;

a ground metal plate printed on a bottom of the dielectric substrate; and

a first radiating element operated at a low frequency extended from the other end of the patch line beyond the ground metal plate and being perpendicular to the patch line in either direction, the first radiating element operated at a low frequency being further extended a predetermined distance in a direction parallel to the patch line toward and spaced apart from the ground metal plate; and

a second radiating element operated at a high frequency projected from a side of the patch line beyond the ground metal plate, the second radiating element being spaced apart from the first radiating element operated at a low frequency.

2. The planar monopole antenna of claim 1, wherein the first radiating element operated at a low frequency extended from the other end of the patch line beyond the ground metal plate is at the same side as the second radiating element.

3. The planar monopole antenna of claim 1, wherein the first radiating element operated at a low frequency extended from the other end of the patch line beyond the ground metal plate is opposite to the second radiating element with respect to the patch line and proximate the ground metal plate.

4. The planar monopole antenna of claim 1, wherein a length of each of the radiating elements extended from the patch line beyond the ground metal plate is about one-quarter wavelength at each operating frequency of the frequency ranges.