COMPACT PLANAR INVERTED F-ANTENNA FOR MULTIBAND COMMUNICATION

• US 20130249764A1
• Filed: 03/23/2012
• Published: 09/26/2013
• Est. Priority Date: 03/23/2012
• Status: Abandoned Application

• Current Assignee: Communications Research Centre Canada (Government of Canada)
• Original Assignee: Her Majesty The Queen In Right of Canada As Represented By The Minister of Industry (The Republic of Canada)
• Inventors: Amaya, Rony E., Cao, Yazi
• Application Number:
  US13/428,675
• Publication Number:
  US 20130249764A1
• Time in Patent Office: Days
• US Class Current: 343/845
• CPC Class Codes: H01Q 1/243 with built-in antennas
• 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 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A multi-band antenna for sending/receiving wireless communication signals in a plurality of frequency bands. The multi-band antenna has a feed element for sending/receiving signals associated with the wireless communication signals. A stepped-impedance structure is connected to the feed element. The stepped-impedance structure has a plurality of concatenated stepped-impedance elements with each stepped-impedance element having a predetermined impedance and a predetermined electrical length associated with a resonance mode for sending/receiving wireless communication signals in a respective frequency band of the plurality of frequency bands.

Claims

1. A multi-band antenna for sending/receiving wireless communication signals in a plurality of frequency bands comprising:

a feed element for sending/receiving signals associated with the wireless communication signals; and

,

a stepped-impedance structure connected to the feed element, the stepped-impedance structure having a plurality of concatenated stepped-impedance elements, each stepped-impedance element having a predetermined impedance and a predetermined electrical length associated with a resonance mode for sending/receiving wireless communication signals in a respective frequency band of the plurality of frequency bands.

2. A multi-band antenna as defined in claim 1, wherein the stepped-impedance structure comprises a plurality of folded stripe lines with each stripe line being associated with a respective stepped-impedance element.

3. A multi-band antenna as defined in claim 2, comprising a shorted element connected to one of the stepped-impedance elements at a first end and connected to a ground plane at a second end.

4. A multi-band antenna as defined in claim 2, wherein the feed element comprises an interdigitated coupler.

5. A multi-band antenna as defined in claim 2, wherein the multi-band antenna forms a planar inverted F-antenna.

6. A multi-band antenna as defined in claim 1, wherein the stepped-impedance structure comprises more than two stepped-impedance elements for sending/receiving wireless communication signals in more than two frequency bands.

7. A multi-band antenna for sending/receiving wireless communication signals in a plurality of frequency bands comprising:

an interdigitated coupled feed element disposed on a dielectric substrate, the interdigitated coupled feed element for transmitting signals associated with the wireless communication signals;

a stepped-impedance structure disposed on the dielectric substrate and connected to the feed element, the stepped-impedance structure having a plurality of concatenated folded stripe lines, each folded stripe line having a predetermined impedance and a predetermined electrical length associated with a resonance mode for sending/receiving wireless communication signals in a respective frequency band of the plurality of frequency bands; and

a shorted element disposed on the dielectric substrate, the shorted element being connected to one of the folded stripe lines at a first end and connected to a ground plane at a second end.

8. A multi-band antenna as defined in claim 7, wherein the interdigitated coupled feed element and the stepped-impedance structure are disposed on a first surface of the dielectric substrate, and wherein the ground plane is disposed on a second opposite surface of the dielectric substrate.

9. A multi-band antenna as defined in claim 8, wherein the stepped-impedance structure comprises more than two folded stripe lines for sending/receiving wireless communication signals in more than two frequency bands.

10. A multi-band antenna as defined in claim 8, wherein the stepped-impedance structure comprises five folded stripe lines for sending/receiving wireless communication signals in frequency bands centered at 915 MHz, 1575 MHz, 2400 MHz, 3200 MHz and 5800 MHz.