Meander line antenna

• US 5,892,490 A
• Filed: 11/03/1997
• Issued: 04/06/1999
• Est. Priority Date: 11/07/1996
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Asakura, Kenji, Kanba, Seiji, Tsuru, Teruhisa, Mandai, Harufumi
• Primary Examiner(s): LE, HOANGANH T
• Application Number:
  US08/962,784
• Time in Patent Office: 519 Days
• Field of Search: 343/895, 343/702, 343/787, 343/788, 343/718, 343/872, 343/873
• US Class Current: 343/895
• CPC Class Codes: H01Q 1/243 with built-in antennas
• 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

Abstract

A meander line antenna includes a rectangular-parallelopiped base member made from a dielectric material having barium oxide, aluminum oxide, and silica as main components, a meander-shaped conductor having, e.g., 10 corners made of copper or a copper alloy by printing, deposition, pasting, or plating inside the base member, and a power-feed terminal for applying a voltage to the conductor. The meander-shaped conductor is formed in the longitudinal direction of the base member. One end of the conductor is led to a surface of the base member to form a power-feed section and is connected to the power-feed terminal. The other end of the conductor serves as an open end inside the base member.

Claims

1. A meander line antenna comprising:

a base member comprising at least one of a dielectric material and a magnetic material; and

at least one meander-shaped conductor disposed at least one of on a surface of said base member and inside said base member;

wherein the resonant frequency f1 of said meander line antenna satisfies the following equation when the resonant frequency f0 of a line-shaped antenna is expressed by f0=(C/.di-elect cons.⁰.5)/(4×

L), where C is the speed of light, .di-elect cons. is the dielectric constant of the base member, and L is the length of the conductor;

space="preserve" listing-type="equation">f1=A×

T.sup.0.5 ×

f0

where A=K/P⁰.5 -L/P+M, T is the number of turns in said meander-shaped conductor, and K, L, and M are constants, and P is the interval between facing line segments in the conductor.

2. The meander line antenna of claim 1, further comprising;

at least one power-feed terminal disposed on a surface of said base member and connected to said conductor.

3. The meander line antenna of claim 2, wherein a second end of the conductor comprises a free end at least one of inside the base member or on the surface of the base member.

4. The meander line antenna of claim 1, wherein the conductor is disposed inside the base member and the base member comprises a plurality of laminated layers with said conductor being provided on at least one of said layers.

5. A method of producing a meander line antenna comprising the steps of:

preparing a base member comprising at least one of a dielectric material and a magnetic material; and

disposing at least one meander-shaped conductor at least one of on a surface of said base member and inside said base member;

wherein the resonant frequency f1 of said meander line antenna is determined to satisfy the following equation when the resonant frequency f0 of a line-shaped antenna is expressed by f0=(C/.di-elect cons.⁰.5)/(4×

L), where C is the speed of light, .di-elect cons. is the dielectric constant of the base member, and L is the length of the conductor;

space="preserve" listing-type="equation">f1=A×

T.sup.0.5 ×

f0

where A=K/P⁰.5 -L/P+M, T is the number of turns in said meander-shaped conductor, and K, L, and M are constants, and P is the interval between facing line segments in the conductor.

6. The method of claim 5, further comprising providing said base member as a plurality of laminated layers, with said conductor being disposed on at least one of said layers.

7. A method of producing a meander line antenna comprising the steps of:

preparing a base member comprising at least one of a dielectric material and a magnetic material;

disposing at least one meander-shaped conductor at least one of on a surface of said base member and inside said base member; and

disposing at least one power-feed terminal on a surface of said base member so that the power-feed terminal is connected to said conductor;

wherein the resonant frequency f1 of said meander line antenna is determined to satisfy the following equation when the resonant frequency f0 of a line-shaped antenna is expressed by f0=(C/.di-elect cons.⁰.5)/(4×

L), where C is the speed of light, .di-elect cons. is the dielectric constant of the base member, and L is the length of the conductor;

space="preserve" listing-type="equation">f1=A×

T.sup.0.5 ×

f0

where A=K/P⁰.5 -L/P+M, T is the number of turns in said meander-shaped conductor, and K, L, and M are constants, and P is the interval between facing line segments in the conductor.

8. The method of claim 7, further comprising providing said base member as a plurality of laminated layers, with said conductor being disposed on at least one of said layers.