MINIATURE PLANAR NOTCH ANTENNA USING MICROSTRIP FEED LINE

• US 20060232476A1
• Filed: 04/15/2005
• Published: 10/19/2006
• Est. Priority Date: 04/15/2005
• Status: Active Grant

• Current Assignee: Tamkang University
• Original Assignee: Tamkang University
• Inventors: Chang, Jian-Ping, Li, Ching-Lieh
• Granted Patent: US 7,132,991 B1
• Time in Patent Office: Days
• US Class Current: 343/700.MS
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 13/106 Microstrip slot antennas patch antenna elements H01Q9/0407
• CPC Class Codes: H01Q 13/16 Folded slot antennas

Abstract

A miniature antenna for various wireless communication applications in the ISM band around 2.45 GHz is provided. The miniature antenna mainly contains a bended planar notch antenna with a metallic stub as a capacitive load. A microstrip feed line is also appropriately bended so as to achieve a significant reduction of the antenna'"'"'s dimension. The miniature antenna could be implemented using simple manufacturing processes on a common circuit board without mechanical work or advanced processes such as low temperature co-fired ceramics. The antenna has a comparable performance to those antennas having much larger dimensions.

Claims

1. A miniature planar notch antenna implemented on a circuit board for sending and receiving wireless signals in a microwave band, comprising:

a notch antenna positioned on a ground side of said circuit board having a linear shape without crossing itself and having a first length and a first width, said notch antenna being bended at least twice;

a metallic stub positioned on the other side of said circuit board opposite to said ground side having a linear shape without crossing itself and having a second length and a second width, said metallic stub passing astride said notch antenna at a first location of said notch antenna; and

a microstrip feed line positioned on the same side of said circuit board as said metallic stub having a linear shape without crossing itself and having a third length and a third width, said microstrip feed line bended at least once for an appropriate angle, said microstrip feed line positioned at a side to said metallic stub with an appropriate distance therebetween without intersecting said metallic stub, said microstrip feed line passing astride said notch antenna at a second location of said notch antenna.

2. The miniature planar notch antenna as claimed in claim 1, wherein said notch antenna has three sections and two right-angle turns.

3. The miniature planar notch antenna as claimed in claim 1, wherein said metallic stub is bended at least once for an appropriate angle.

4. The miniature planar notch antenna as claimed in claim 1, wherein said metallic stub is a capacitive load to said notch antenna.