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|
Meander line antenna
| Details |
Inventors: Asakura, Kenji; Kanba, Seiji; Tsuru, Teruhisa; Mandai, Harufumi;
Assignee: Murata Manufacturing Co., Ltd. (JP)
Primary Examiner: Le; Hoanganh
Assistant Examiner:
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen, LLP
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. |
|
DETAILED DESCRIPTION The present invention has been made to solve this problem.
Accordingly, it is an object of the present invention to provide a compact meander line antenna whose resonant frequency can be determined at a design stage.
The present invention provides a meander line antenna comprising: a base member made from 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.
.
sup.
0.
5)/(4.
times.
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; f1=A.
times.
T.
sup.
0.
5 .
times.
f0 where A=K/P.
sup.
0.
5 -L/P+M, T is the number of turns in said meander-shaped conductor, and K, L, and M are constants.
The above meander line antenna may further comprise at least one power-feed terminal disposed on a surface of said base member and connected to said conductor.
The present invention further provides a method of producing the above meander line antenna, comprising the steps of: preparing a base member made from at least one of a dielectric material and a magnetic material; and disposing at least one meander-shaped conductor on at least one of 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.
.
sup.
0.
5)/(4.
times.
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; f1=A.
times.
T.
sup.
0.
5 .
times.
f0 where A=K/P.
sup.
0.
5 -L/P+M, T is the number of turns in said meander-shaped conductor, and K, L, and M are constants
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