Dual-band meandering-line antenna

• US 6,674,405 B2
• Filed: 01/29/2002
• Issued: 01/06/2004
• Est. Priority Date: 02/15/2001
• Status: Active Grant

• Current Assignee: Qisda Corporation
• Original Assignee: BenQ Corporation (Qisda Corporation)
• Inventors: Wang, Chien-Jen
• Primary Examiner(s): Nguyen, Hoang V.
• Assistant Examiner(s): CHEN, SHIH CHAO
• Application Number:
  US09/683,643
• Publication Number:
  US 20020118142A1
• Time in Patent Office: 707 Days
• Field of Search: 343/700.MS, 343/702, 343/846, 343/895, 343/806
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take 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 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/364 Creating multiple current paths
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence
• CPC Class Codes: H01Q 9/26 with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength resonant loop antennas H01Q7/00
• 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

A microstrip meandering-line antenna for a wireless communications system includes a substrate, a meandering-line conductor, and a feeding wire. The substrate, which is made of a dielectric material or a magnetic material, has a first surface. The meandering-line conductor is attached to the first surface in a reciprocating bent manner for receiving radio signals, and the meandering-line conductor has a mid-point connection between two ends of the meandering-line conductor. The feeding wire is electrically connected to the mid-point of the meandering-line conductor for transmitting a received radio signal to the wireless communications system.

Claims

1. A meandering-line antenna for a wireless communications system, the meandering-line antenna comprising:

a substrate having a first surface;

a meandering-line conductor attached to the first surface in a reciprocating bent manner for receiving radio signals, the meandering-line conductor having a mid-point connection between two ends of the meandering-line conductor; and

a feeding wire electrically connected to the mid-point connection for transmitting a received radio signal to the wireless communications system,

wherein the substrate further comprises a via hole through which a portion of the feeding wire is disposed.

2. The meandering-line antenna of claim 1 wherein the mid-point connection divides the meandering-line conductor into a first segment bent at a first interval and a second segment bent at a second interval.

3. The meandering-line antenna of claim 1 wherein the mid-point connection divides the meandering-line conductor into a first segment and a second segment, further, line widths of the first segment and the second segment are different.

4. The meandering-line antenna of claim 1 further comprising a feeding terminal on the substrate, and the feeding wire is electrically connected to the feeding terminal and to the mid-point connection.

5. The meandering-line antenna of claim 1 wherein the wireless communications system comprises a system circuit board, and the substrate is set approximately perpendicular to the system circuit board in the wireless communications system.

6. The meandering-line antenna of claim 1 wherein the substrate is made of a dielectric material or a magnetic material.

7. An antenna comprising:

a substrate having a first surface;

a meandering-line conductor formed on the first surface in a reciprocating bent manner along a first direction for receiving radio signals, the meandering-line conductor having a mid-point connection between two ends of the meandering-line conductor, and the mid-point connection dividing the meandering-line conductor into a first segment and a second segment, the first segment having a first resonant frequency and the second segment having a second resonant frequency being different from the first resonant frequency;

a feeding wire electrically connected to the mid-point connection for transmitting a received radio signal to the wireless communications system, the feeding wire having a frequency-modifying portion extending along a second direction approximately parallel to the first direction for modifying the first resonant frequency or the second resonant frequency.

8. A meandering-line antenna for a wireless communications system, the meandering-line antenna comprising:

a substrate having a first surface;

a meandering-line conductor attached to the first surface in a reciprocating bent manner for receiving radio signals, the meandering-line conductor having a mid-point connection between two ends of the meandering-line conductor; and

a feeding wire electrically connected to the mid-point connection for transmitting a received radio signal to the wireless communications system, the feeding wire having a frequency-modifying portion for modifying a resonant frequency of the meandering-line antenna.

9. The meandering-line antenna of claim 8 wherein the meandering-line conductor extends along a predetermined direction and the frequency-modifying portion of the feeding wire is approximately parallel to the predetermined direction.

10. The meandering-line antenna of claim 8 wherein the substrate further comprises a second surface, the frequency-modifying portion of the feeding wire disposed on the second surface.

11. A meandering-line antenna for a wireless communications system, the meandering-line antenna comprising:

a substrate having a first surface;

a meandering-line conductor attached to the first surface in a reciprocating bent manner for receiving radio signals, the meandering-line conductor having a mid-point connection between two ends of the meandering-line conductor;

a feeding wire electrically connected to the mid-point connection for transmitting a received radio signal to the wireless communications system; and

a frequency-modifying line electrically connected to the feeding wire in a crossing manner for modifying a resonant frequency of the meandering-line antenna.

12. The meandering-line antenna of claim 11 wherein the meandering-line conductor extends along a predetermined direction and the frequency-modifying line is approximately parallel to the predetermined direction.

13. The meandering-line antenna of claim 11 wherein the substrate further comprises a second plane, the frequency-modifying line disposed on the second plane.