LEFT-HANDED RESONATOR AND LEFT-HANDED FILTER USING THE SAME

• US 20110043304A1
• Filed: 05/11/2009
• Published: 02/24/2011
• Est. Priority Date: 05/12/2008
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Tamura, Masaya
• Granted Patent: US 8,604,896 B2
• Time in Patent Office: Days
• US Class Current: 333/185
• CPC Class Codes: H01P 1/20345 Multilayer filters
• CPC Class Codes: H01P 7/084 Triplate line resonators H01P7/088 takes precedence
• CPC Class Codes: H03H 2001/0085 Multilayer, e.g. LTCC, HTCC, green sheets inside PCB filters H05K
• CPC Class Codes: H03H 7/0115 comprising only inductors and capacitors H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence
• CPC Class Codes: H03H 7/09 Filters comprising mutual inductance
• CPC Class Codes: H03H 7/1733 Element between different shunt or branch paths H03H7/425 takes precedence
• CPC Class Codes: H03H 7/175 Series LC in series path H03H7/1783 takes precedence
• CPC Class Codes: H03H 7/1758 Series LC in shunt or branch path H03H7/1791 takes precedence
• CPC Class Codes: H03H 7/1775 Parallel LC in shunt or branch path H03H7/1791 takes precedence

Abstract

A left-handed resonator according to the present invention includes: a series body in which an inductor component and a capacitor component are connected in series; and a parallel body in which an inductor component and a capacitor component are connected in parallel, wherein one end of the series body and one end of the parallel body are connected, the other end of the parallel body is grounded, and the other end of the series body is grounded. With this configuration, a −1-order mode is excited using only one unit cell including the series body and the parallel body, so that dimensions of the left-handed resonator can be miniaturized.

Claims

1. A left-handed resonator comprising:

a series body in which an inductor and a capacitor are connected in series; and

a parallel body in which an inductor and a capacitor are connected in parallel, wherein

one end of the series body and one end of the parallel body are connected, the other end of the parallel body is grounded, and the other end of the series body is grounded.

2. The left-handed resonator according to claim 1, wherein the left-handed resonator resonates in a −

1-order mode.

3. A left-handed filter comprising:

an input port;

a first output port;

a second output port;

an inter-step coupling element that is connected between the input port and the first output port

the first left-handed resonator according to claim 1 that includes a first series body and a first parallel body, an inductor and an capacitor of the first series body being connected in series, an inductor and a capacitor of the first parallel body being connected in parallel to the first series body, the first series body and the first parallel body being connected between the input port and one end of the inter-step coupling element;

the second left-handed resonator according to claim 1 that includes a second series body and a second parallel body, an inductor and an capacitor of the second series body being connected in series, an inductor and a capacitor of the second parallel body being connected in parallel to the second series body, the second series body and the second parallel body being connected between the first output port and the other end of the inter-step coupling element; and

the third left-handed resonator according to claim 1 that includes a third series body and a third parallel body, an inductor and an capacitor of the third series body being connected in series, an inductor and a capacitor of the third parallel body being connected in parallel to the third series body, the third series body and the third parallel body being connected to the second output port, wherein

magnetic field coupling is generated between the inductor of the first parallel body and the inductor of the third parallel body.

6. A left-handed filter comprising:

an input port;

an output port;

at least the two left-handed resonators according to claim 1 that are connected in parallel between the input port and the output port;

at least one coupling element that is connected between one end of the left-handed resonator and one end of the adjacent left-handed resonator;

a first inductor that is connected between the input port and a coupling element located on a side closest to the input port in the coupling elements; and

a second inductor that is connected between the output port and a coupling element located on a side closest to the output port in the coupling elements, wherein

magnetic field coupling is generated between the first inductor and the second inductor, and

the other end of the left-handed resonator is grounded.

4. A left-handed filter comprising an input port and an output port, wherein

a coupling element is interposed between the input port and the output port,

one end of a first series body including a capacitor and an inductor is electrically connected between the input port and the coupling element,

an input coupling element is electrically connected between one end of the first series body and the input port,

one end of a second series body including a capacitor and an inductor is electrically connected between the output port and the coupling element,

an output coupling element is electrically connected between one end of the second series body and the output port,

one end of a first parallel body including a capacitor and an inductor is electrically connected to the other end of the first series body,

one end of a second parallel body including a capacitor and an inductor is electrically connected to the other end of the second series body,

the other end of the first parallel body is electrically connected to a ground,

the other end of the second parallel body is electrically connected to the ground,

the first series body and the first parallel body constitute a first cell,

the second series body and the second parallel body constitute a second cell, and

electromagnetic field coupling is generated between the first cell and the second cell.

5. The left-handed filter according to claim 4, wherein one end of the first parallel body is electrically connected to one end of the first series body instead of being electrically connected to the other end of the first series body, and

one end of the second parallel body is electrically connected to one end of the second series body instead of being electrically connected to the other end of the second series body.