Chip antenna apparatus and methods

• US 7,679,565 B2
• Filed: 12/28/2006
• Issued: 03/16/2010
• Est. Priority Date: 06/28/2004
• Status: Active Grant

• Current Assignee: Pulse Finland Oy (Yageo Corporation)
• Original Assignee: Pulse Finland Oy (Yageo Corporation)
• Inventors: Sorvala, Juha
• Primary Examiner(s): PHAN, THO GIA
• Application Number:
  US11/648,431
• Publication Number:
  US 20070152885A1
• Time in Patent Office: 1,174 Days
• Field of Search: 343/700.MS, 343/846
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/2283 mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
• 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 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence

Abstract

A chip component with dielectric substrate and plurality of radiating antenna elements on the surface thereof. In one embodiment, two (2) substantially symmetric elements are used, each covering an opposite head and upper surface portion of the device. The surface between the elements comprises a slot. The chip is mounted on a circuit board (e.g., PCB) whose conductor pattern is part of the antenna. No ground plane is used under the chip or its sides to a certain distance. One of the antenna elements is coupled to the feed conductor on the PCB and to the ground plane, while the parasitic element is coupled only to the ground plane. The parasitic element is fed through coupling over the slot, and both elements resonate at the operating frequency. The antenna can be tuned and matched without discrete components, is substantially omni-directional, and has low substrate losses due to simple field image.

Claims

1. An antenna comprising:

a dielectric substrate having a first dimension and a second dimension, the dielectric substrate being disposed on a mounting substrate and at least partially coupled to a ground plane;

a conductive layer having a first portion and a second portion to form a first resonant element and a second resonant element respectively;

an electromagnetic coupling element disposed between the first portion and the second portion; and

a feed structure connected to the first portion and coupled through the electromagnetic coupling element to the second portion so as to form a resonant structure between the first resonant element, the second resonant element, the mounting substrate, and the ground plane.

2. The antenna of claim 1, wherein the resonant structure comprises a quarter-wave resonator selected to operate substantially within a first frequency range.

3. The antenna of claim 1, wherein the feed structure connected to the first portion comprises a conductive material asymmetrically coupled to the first portion to provide a substantially omni-directional radiation pattern within a first frequency range.

4. The antenna of claim 1, wherein the ground plane comprises a conductive material coupled to a first side of the first resonant element and to a second side of the second resonant element, and distally located relative to the electromagnetic coupling element.

5. The antenna of claim 1, wherein the first resonant element comprises a first conductive patch on a first location adjacent said dielectric substrate, and the second resonant element comprises a second conductive patch on a second location adjacent said dielectric substrate;

wherein the first and second conductive patches cooperate to provide a substantially omni-directional antenna radiation pattern.

6. The antenna of claim 1, wherein the electromagnetic coupling element comprises a capacitance electromagnetically coupling the open ends of the first and the second resonant elements so as to lower a natural resonant frequency of the antenna.

7. The antenna of claim 1, wherein the dielectric substrate comprises a ceramic material.

8. The antenna of claim 1, wherein the electromagnetic coupling element comprises a capacitance coupled to open ends of the first resonant element and the second resonant element so as to lower a natural frequency range of the first resonant element and the second resonant element.

9. The antenna of claim 1, wherein the second resonant element comprises a conductive trace coupled to the ground plane and adapted to permit tuning of an antenna frequency response.

10. The antenna of claim 1, wherein the electromagnetic coupling element comprises mutually coupled members between the first resonant element and the second resonant element.

11. A high-efficiency antenna, comprising:

a substrate having a first dimension and a second dimension, the substrate being disposed on a mounting element and at least partially coupled to a ground plane;

an electrically conductive layer having a first portion and a second portion configured so as to form a first resonant element and a second resonant element respectively;

a coupling element disposed electrically between the first portion and the second portion; and

a feed structure connected to the first portion and electromagnetically coupled through the coupling element to the second portion so as to form a resonant structure between the first resonant element, the second resonant element, the mounting element, and the ground plane;

wherein said antenna is further configured to produce a substantially omni-directional radiation pattern.

12. The antenna of claim 11, wherein the resonant structure comprises a quarter-wave resonator selected to operate substantially within a first frequency range.

13. The antenna of claim 11, wherein the feed structure connected to the first portion comprises a conductive material asymmetrically coupled to the first portion to provide said substantially omni-directional radiation pattern within a first frequency range.

14. The antenna of claim 11, wherein the ground plane comprises a conductive material coupled to a first side of the first resonant element and to a second side of the second resonant element, and distally located relative to the coupling element.

15. The antenna of claim 11, wherein:

the first resonant element comprises a first conductive patch on a first location adjacent said substrate;

the second resonant element comprises a second conductive patch on a second location adjacent said substrate; and

wherein the first and second conductive patches cooperate to provide said substantially omni-directional antenna radiation pattern.

16. The antenna of claim 11, wherein the coupling element comprises a capacitance electromagnetically coupling the open ends of the first and the second resonators so as to lower a natural resonant frequency of the antenna.

17. The antenna of claim 11, wherein the substrate comprises a ceramic material.

18. An antenna comprising:

a dielectric substrate having a first dimension and a second dimension, the dielectric substrate comprising means for disposing the dielectric substrate on a mounting substrate, the means for disposing further comprising means at least partially coupling the dielectric substrate to a ground plane;

a conductive layer having a first portion and a second portion, the first and second portions each having a first resonant means and a second resonant means respectively;

means for electromagnetic coupling the first portion and the second portion; and

means for forming a resonant structure between the first resonant means, the second resonant means, the mounting substrate, and the ground plane, the means for forming the resonant structure comprising a feed structure connected to the first portion and coupled through the means for electromagnetic coupling to the second portion.

19. The antenna of claim 18, wherein the means for forming the resonant structure comprises a quarter-wave resonator selected to operate substantially within a first frequency range.

20. The antenna of claim 18, wherein the feed structure connected to the first portion comprises a conductive material asymmetrically coupled to the first portion to provide a substantially omni-directional radiation pattern within a first frequency range.

21. The antenna of claim 18, wherein the ground plane comprises a conductive material coupled to a first side of the first resonant means and to a second side of the second resonant means, and distally located relative to the means for electromagnetic coupling.

22. The antenna of claim 18, wherein the first resonant means comprises a first conductive patch on a first location adjacent said dielectric substrate, and the second resonant means comprises a second conductive patch on a second location adjacent said dielectric substrate;

wherein the first and second conductive patches cooperate to provide a substantially omni-directional antenna radiation pattern.

23. The antenna of claim 18, wherein the means for electromagnetic coupling further comprises a capacitance electromagnetically coupling the open ends of the first and the second resonant elements so as to lower a natural resonant frequency of the antenna.

24. The antenna of claim 18, wherein the dielectric substrate comprises a ceramic material.

25. The antenna of claim 18, wherein the means for electromagnetic coupling comprises a capacitance coupled to open ends of the first resonant means and the second resonant means so as to lower a natural frequency range of the first resonant means and the second resonant means.

26. The antenna of claim 18, wherein the second resonant means comprises a conductive trace coupled to the ground plane and means for tuning of an antenna frequency response.

27. The antenna of claim 18, wherein the means for electromagnetic coupling comprises mutually coupled members between the first resonant means and the second resonant means.

28. A high-efficiency antenna, comprising:

a substrate having a first dimension and a second dimension, the substrate comprising one or more attachment elements for disposing the substrate onto a mounting element and for at least partially coupling the substrate to a ground plane;

an electrically conductive layer having a first portion and a second portion configured so as to form a first resonant element and a second resonant element respectively;

a coupling element disposed electrically between the first portion and the second portion; and

a feed structure connected to the first portion and electromagnetically coupled through the coupling element to the second portion so as to form a resonant structure between the first resonant element, the second resonant element, the mounting element, and the ground plane;

wherein the antenna is further configured to produce a substantially omni-directional radiation pattern.

29. The antenna of claim 28, wherein the resonant structure comprises a quarter-wave resonator selected to operate substantially within a first frequency range.

30. The antenna of claim 28, wherein the feed structure connected to the first portion comprises a conductive material asymmetrically coupled to the first portion to provide the substantially omni-directional radiation pattern within a first frequency range.

31. The antenna of claim 28, wherein the ground plane comprises a conductive material coupled to a first side of the first resonant element and to a second side of the second resonant element, and distally located relative to the coupling element.

32. The antenna of claim 28, wherein:

the first resonant element comprises a first conductive patch on a first location adjacent the substrate;

the second resonant element comprises a second conductive patch on a second location adjacent the substrate; and

wherein the first and second conductive patches cooperate to provide the substantially omni-directional antenna radiation pattern.

33. The antenna of claim 28, wherein the coupling element comprises a capacitance electromagnetically coupling the open ends of the first and the second resonators so as to lower a natural resonant frequency of the antenna.

34. The antenna of claim 28, wherein the substrate comprises a ceramic material.

35. An antenna comprising:

a dielectric substrate having a first dimension and a second dimension, the dielectric substrate comprising one or more attachment elements adapted for disposing the dielectric substrate onto a mounting substrate and at least partially coupling the dielectric substrate to a ground plane;

a conductive layer having a first portion and a second portion to form a first resonant element and a second resonant element respectively;

an electromagnetic coupling element disposed between the first portion and the second portion; and

a feed structure connected to the first portion and coupled through the electromagnetic coupling element to the second portion so as to form a resonant structure between the first resonant element, the second resonant element, the mounting substrate, and the ground plane.

36. The antenna of claim 35, wherein the resonant structure comprises a quarter-wave resonator selected to operate substantially within a first frequency range.

37. The antenna of claim 35, wherein the feed structure connected to the first portion comprises a conductive material asymmetrically coupled to the first portion to provide a substantially omni-directional radiation pattern within a first frequency range.

38. The antenna of claim 35, wherein the ground plane comprises a conductive material coupled to a first side of the first resonant element and to a second side of the second resonant element, and distally located relative to the electromagnetic coupling element.

39. The antenna of claim 35, wherein the first resonant element comprises a first conductive patch on a first location adjacent said dielectric substrate, and the second resonant element comprises a second conductive patch on a second location adjacent said dielectric substrate;

wherein the first and second conductive patches cooperate to provide a substantially omni-directional antenna radiation pattern.

40. The antenna of claim 35, wherein the electromagnetic coupling element comprises a capacitance electromagnetically coupling the open ends of the first and the second resonant elements so as to lower a natural resonant frequency of the antenna.

41. The antenna of claim 35, wherein the dielectric substrate comprises a ceramic material.

42. The antenna of claim 35, wherein the electromagnetic coupling element comprises a capacitance coupled to open ends of the first resonant element and the second resonant element so as to lower a natural frequency range of the first resonant element and the second resonant element.

43. The antenna of claim 35, wherein the second resonant element comprises a conductive trace coupled to the ground plane and adapted to permit tuning of an antenna frequency response.

44. The antenna of claim 35, wherein the electromagnetic coupling element comprises mutually coupled members between the first resonant element and the second resonant element.