Chip antenna having multiple resonance frequencies

• US 5,870,066 A
• Filed: 10/22/1996
• Issued: 02/09/1999
• Est. Priority Date: 12/06/1995
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murana Manufacturing Company Limited
• Inventors: Asakura, Kenji, Suesada, Tsuyoshi, Kanba, Seiji, Tsuru, Teruhisa, Mandai, Harufumi
• Primary Examiner(s): Le, Hoanganh T.
• Application Number:
  US08/735,104
• Time in Patent Office: 840 Days
• Field of Search: 343/702, 343/895, 343/700 MS, 343/846, 343/873, 343/893
• US Class Current: 343/895
• CPC Class Codes: H01Q 1/362 for broadside radiating helical 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 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/321 within a radiating element or between connected radiating elements
• CPC Class Codes: H01Q 5/357 using a single feed point
• CPC Class Codes: H01Q 5/371 Branching current paths

Abstract

A chip antenna comprising a substrate comprising at least one material selected from dielectric materials and magnetic materials, at least two conductors formed on at least one surface of the substrate or inside the substrate, and at least one feeding terminal provided on the surface of the substrate for applying a voltage to the conductors.

Claims

1. A chip antenna comprising:

a substrate comprising a plurality of sheet layers stacked on each other, said sheet layers each comprising at least one of a dielectric material and a magnetic material, the sheet layers each having a surface, the surface of each layer establishing a stacking direction normal to the surface of each layer, the substrate comprising the plurality of sheet layers having a substrate surface;

a first conductor disposed inside said substrate;

a second conductor disposed inside said substrate;

at least one feeding terminal provided on the surface of said substrate for applying a voltage to at least one of said conductors;

wherein a plurality of first conductive patterns and a plurality of second conductive patterns are provided on respective surfaces of said sheet layers;

said first and second conductors being formed respectively by said plurality of first conductive patterns and said plurality of second conductive patterns, the first and second conductors extending one of meanderingly and spirally perpendicular to the stacking direction of said substrate, and

each of said first and second conductors has a different resonance frequency wherein the chip antenna has at least two resonance frequencies.

2. A chip antenna according to claim 1, wherein said first and second conductors connect with each other in series.

3. A chip antenna according to claim 1, wherein said first and second conductors connect with each other in parallel.

4. A chip antenna according to claim 1, wherein said chip antenna further comprises at least one fixing terminal to fix said substrate to a mounting board.

5. A chip antenna according to claim 1, wherein a first feeding terminal is provided on the surface of said substrate for applying a voltage to said first conductor, and a second feeding terminal is provided on the surface of said substrate for applying a voltage to said second conductor.

6. A chip antenna according to claim 1, wherein the first conductor is disposed on a surface of a first layer and the second conductor is disposed on a surface of a second layer, said layers being laminated together.

7. A chip antenna according to claim 6, wherein the first and second conductors are coupled together by a conductive through hole disposed through at least one of the layers.

8. A chip antenna according to claim 1 wherein portions of said first conductor are disposed on at least two layers, portions of said second conductor are disposed on at least two layers, a conductive through hole being provided in at least one of said layers connecting respective portions of the first conductor together when the layers are laminated together and a conductive through hole being provided in at least one of said layers connecting respective portions of the second conductor together when the layers are laminated together.

9. A chip antenna according to claim 1, wherein the first and second conductor each have a feeding terminal.

10. A chip antenna according to claim 1, wherein at least one of said conductors has a free end.

11. A chip antenna according to claim 1, wherein both said conductors have a free end.

12. A chip antenna according to claim 1, wherein the conductors comprise copper or a copper alloy.

13. A chip antenna according to claim 1, wherein the substrate comprises a combination of a dielectric and a magnetic material.

14. A chip antenna according to claim 1, wherein the dielectric material comprises barium oxide, aluminum oxide and silica.

15. A chip antenna according to claim 1, wherein the dielectric material comprises at least one of titanium oxide and neodymium oxide.

16. A chip antenna according to claim 1, wherein the magnetic material comprises at least one of nickel, cobalt and iron.

17. A chip antenna according to claim 1, wherein the chip antenna has three resonance frequencies.

18. A chip antenna according to claim 17, wherein at least two of the resonance frequencies are spaced close together so that an area of extended bandwidth can be achieved near the two resonance frequencies.

19. A chip antenna according to claim 1, wherein the substrate comprises a rectangular parallelopiped.

20. A chip antenna according to claim 1, wherein said first conductor has a rectangular cross section.

21. A chip antenna according to claim 1, wherein said second conductor has a rectangular cross-section.

22. A chip antenna comprising:

a substrate comprising at least one of a dielectric material and a magnetic material, said substrate comprising a plurality of laminated layers each having a surface;

a plurality of conductors each disposed inside the substrate, at least a portion of each conductor being disposed on at least one of said layers, each of said conductors extending one of spirally and meanderingly along and about a longitudinal axis of the substrate, the longitudinal axis being parallel to the surfaces of said plurality of layers;

at least one feeding terminal provided on a surface of the substrate for applying a voltage to at least one of the conductors; and

said plurality of conductors providing said antenna with a plurality of resonance frequencies.

23. A chip antenna comprising:

a substrate comprising at least one of a dielectric material and a magnetic material, said substrate comprising a plurality of laminated layers each having a surface;

a first conductor disposed inside said substrate;

a second conductor disposed inside said substrate; and

at least one feeding terminal provided on the surface of said substrate for applying a voltage to at least one of said conductors;

said first and second conductors each having a different resonance frequency wherein the chip antenna has at least two resonance frequencies, said first and second conductors extending one of spirally and meanderingly along and about a longitudinal axis of the substrate, the longitudinal axis being parallel to the surfaces of said plurality of laminated layers.