ANTENNA AND WIRELESS COMMUNICATION UNIT

• US 20120162020A1
• Filed: 12/21/2011
• Published: 06/28/2012
• Est. Priority Date: 12/28/2010
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: FUKUNAGA, Tatsuya
• Granted Patent: US 9,054,428 B2
• Time in Patent Office: Days
• US Class Current: 343/700.MS
• CPC Class Codes: H01Q 1/526 Electromagnetic shields
• CPC Class Codes: H01Q 23/00 Antennas with active circuits or circuit elements integrated within them or attached to them
• CPC Class Codes: H01Q 9/04 Resonant antennas

Abstract

An antenna includes: a first resonator and a second resonator each having an open end, in which the first resonator and the second resonator are disposed side by side to allow the open ends thereof to be opposed to each other; and a first capacitor connected between the open ends which are opposed to each other.

Claims

1. An antenna, comprising:

a first resonator and a second resonator each having an open end, the first resonator and the second resonator being disposed side by side to allow the open ends thereof to be opposed to each other; and

a first capacitor connected between the open ends which are opposed to each other.

2. The antenna according to claim 1, wherein each of the first resonator and the second resonator allows a signal to propagate based on a resonance mode in which a current direction in the first resonator is opposite to that in the second resonator.

3. The antenna according to claim 1, wherein each of the first resonator and the second resonator is a planar waveguide type resonator having a conductor line, and the first capacitor is configured with use of a pair of conductor electrode patterns each provided at each of the open ends of the first resonator and the second resonator.

4. The antenna according to claim 1, wherein the first capacitor is a capacitor device which is, as a discrete component, independent from the first resonator and the second resonator.

5. The antenna according to claim 1, further comprising a second capacitor,

wherein

the first resonator is a first half-wavelength resonator having a first open end and a second open end at both ends thereof, respectively,

the second resonator is a second half-wavelength resonator having a first open end and a second open end at both ends thereof, respectively,

the first capacitor is connected between the first open end of the first half-wavelength resonator and the first open end of the second half-wavelength resonator, and

the second capacitor is connected between the second open end of the first half-wavelength resonator and the second open end of the second half-wavelength resonator.

6. The antenna according to claim 5, wherein the first half-wavelength resonator is connected, at a position, to a first end of a signal source, the position being away from a resonance center position of the first half-wavelength resonator by a predetermined distance, and the signal source being grounded at a second end thereof.

7. The antenna according to claim 5, wherein the first half-wavelength resonator is connected, at a position, to a first end of a signal source, the position being away from a resonance center position of the first half-wavelength resonator by a predetermined distance, and the signal source being connected to the second half-wavelength resonator at a resonance center position thereof.

8. The antenna according to claim 1, wherein

the first resonator is a first quarter-wavelength resonator having an open end and a short-circuit end at both ends thereof, respectively, and

the second resonator is a second quarter-wavelength resonator having an open end and a short-circuit end at both ends thereof, respectively.

9. The antenna according to claim 8, wherein the first quarter-wavelength resonator is connected, at a position, to a first end of a signal source, the position being away from the short-circuit end of the first quarter-wavelength resonator by a predetermined distance, and the signal source being grounded at a second end thereof.

10. A wireless communication unit, comprising:

a first antenna transmitting a signal; and

a second antenna receiving the signal transmitted from the first antenna,

the first antenna including;

a first resonator and a second resonator each having an open end, the first resonator and the second resonator being disposed side by side to allow the open ends thereof to be opposed to each other; and

a capacitor connected between the open ends which are opposed to each other.

11. The wireless communication unit according to claim 10, wherein the second antenna includes:

a first resonator and a second resonator each having an open end, the first resonator and the second resonator being disposed side by side to allow the open ends thereof to be opposed to each other; and

a capacitor connected between the open ends which are opposed to each other, and

the first antenna receiving a signal transmitted from the second antenna, the second antenna transmitting the signal to the first antenna, thereby a bidirectional communication through transmitting-receiving the signal is performed between the first antenna and the second antenna.