Planar antenna

• US 20050057424A1
• Filed: 07/12/2004
• Published: 03/17/2005
• Est. Priority Date: 07/10/2003
• Status: Abandoned Application

• Current Assignee: Rafsec Oy (UPM Kymmene OY)
• Original Assignee: Rafsec Oy (UPM Kymmene OY)
• Inventors: Kukko, Vesa, Ahokas, Heikki
• Application Number:
  US10/889,454
• Publication Number:
  US 20050057424A1
• Time in Patent Office: Days
• US Class Current: 343/873
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 1/44 using equipment having another main function to serve additionally as an antenna , e.g. means for giving an antenna an aesthetic aspectH01Q1/27 - H01Q1/34 take precedence
• CPC Class Codes: H01Q 9/04 Resonant antennas
• 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 9/27 Spiral antennas

Abstract

Fabricating planar antenna by incorporating text or graphical images into the conductive part of the antenna.

Claims

1. A planar RF antenna comprising:

a conductive layer formed on a substrate and including visual elements as a part of the conductive layer of the antenna.

2. A planar antenna in accordance with claim 1 wherein the size and placement of the visual elements are used to tune the RF characteristics of the planar antenna.

3. A planar antenna in accordance with claim 1 wherein the visual elements comprise text.

4. A planar antenna in accordance with claim 1 wherein the visual elements comprise graphical representations.

5. A method of fabricating a RF planar antenna including graphical representations on a substrate comprising:

determining the basic physical characteristics of an antenna to nominally tune the RF characteristics of the antenna;

determining the shape and placement of graphical representations to achieve the basic physical characteristics and to fine tune the RF characteristics of the antenna; and

fabricating a conductive layer on a substrate having the basic physical characteristics of the first determining step and including the graphical representations shaped as determined the second determining step at locations determined by the second determining step.

6. A method according to claim 5 wherein the fabricating step comprises fabricating the antenna on a substantially transparent substrate.

7. A method according to claim 5 wherein the antenna is a coil type antenna and the placement of graphical representations comprises tracing the outline of a graphical representation using a conductor and spiraling inwardly therefrom during the fabrication step.

8. A method of designing a planar antenna having text representations comprising:

identifying RF characteristics of a desired antenna;

determining the basic physical characteristics of a dipole antenna to achieve the RF characteristics;

graphically entering into an antenna simulator an antenna having the basic physical characteristics and including representations of text;

performing a simulation of the entered antenna; and

re-entering a modified antenna into the antenna simulator when the performing step shows RF characteristics significantly different from the identified RF characteristics.

9. A method of claim 8 comprising fabricating a dipole antenna in accordance with the simulated antenna when the performance of the simulation shows RF characteristics within a predetermined range of the identified characteristics.