Left-handed resonator and left-handed filter using the same

• US 8,604,896 B2
• Filed: 05/11/2009
• Issued: 12/10/2013
• Est. Priority Date: 05/12/2008
• Status: Expired due to Fees

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Tamura, Masaya
• Primary Examiner(s): Lee, Benny
• Assistant Examiner(s): PATEL, RAKESH BHASKARBHAI
• Application Number:
  US12/989,690
• Publication Number:
  US 20110043304A1
• Time in Patent Office: 1,674 Days
• Field of Search: 333/126, 333/129, 333/132, 333/185, 333/168, 333/173, 333/204, 333/219
• US Class Current: 333/168
• 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, and

the left-handed resonator resonates in a −

1-order mode while exciting a quarter wavelength mode only with the series body and the parallel body.

2. 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;

a first left-handed resonator that includes a first series body and a first parallel body, an inductor and a 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, one end of the first series body of the first left-handed resonator and one end of the first parallel body of the first left-handed resonator being connected to the input port and one end of the inter-step coupling element, another end of the first parallel body of the first left-handed resonator being grounded, another end of the first series body of the first left-handed resonator being grounded;

a second left-handed resonator that includes a second series body and a second parallel body, an inductor and a 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, one end of the second series body of the second left-handed resonator and one end of the second parallel body of the second left-handed resonator being connected to the first output port and the other end of the inter-step coupling element, another end of the second parallel body of the second left-handed resonator being grounded, another end of the second series body of the second left-handed resonator being grounded; and

a third left-handed resonator that includes a third series body and a third parallel body, an inductor and a 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, one end of the third series body of the third left-handed resonator and one end of the third parallel body of the third left-handed resonator being connected to the second output port, another end of the third parallel body of the third left-handed resonator being grounded, another end of the third series body of the third left-handed resonator being grounded, wherein

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

3. The left-handed filter according to claim 2, wherein

the first left-handed resonator resonates in a −

1-order mode while exciting a quarter wavelength mode,

the second left-handed resonator resonates in a −

1-order mode while exciting a quarter wavelength mode, and

the third left-handed resonator resonates in a −

1-order mode while exciting a quarter wavelength mode.

4. A left-handed filter comprising:

an input port;

a first inductor connected with the input port;

an output port;

a second inductor connected with the output port;

a first left-handed resonator connected between the input port and the output port, said first left-handed resonator including;

a first series body in which an inductor and a capacitor are connected in series, and

a first parallel body in which an inductor and a capacitor are connected in parallel, wherein one end of the first series body and one end of the first parallel body are connected to the input port via the first inductor, the other end of the first parallel body is grounded, and the other end of the first series body is grounded;

a second left-handed resonator that is connected in parallel with the first left-handed resonator and between the input port and the output port, said second left-handed resonator including;

a second series body in which an inductor and a capacitor are connected in series, and

a second parallel body in which an inductor and a capacitor are connected in parallel, wherein one end of the second series body and one end of the second parallel body are connected to the output port via the second inductor, the other end of the second parallel body is grounded, and the other end of the second series body is grounded; and

a coupling element that is connected between the one end of the first series body of the first left-handed resonator and the one end of the second series body of the second left-handed resonator, wherein

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

the other end of the first left-handed resonator and the other end of the second left-handed resonator are grounded, and

the first left-handed resonator resonates in a −

1-order mode while exciting a quarter wavelength mode only with the first series body and the first parallel body.

5. The left-handed filter according to claim 4, wherein the second left-handed resonator resonates in a −

1-order mode while exciting a quarter wavelength mode.

6. The left-handed filter according to claim 5, wherein the second left-handed resonator resonates in a −

1-order mode while exciting a quarter wavelength mode only with the second series body and the second parallel body.

7. A left-handed filter comprising:

an input port;

a first inductor connected with the input port;

an output port;

a second inductor connected with the output port;

a first left-handed resonator connected between the input port and the output port, said first left-handed resonator including

a first series body in which an inductor and a capacitor are connected in series, and

a first parallel body in which an inductor and a capacitor are connected in parallel, wherein one end of the first series body and one end of the first parallel body are connected to the input port via the first inductor, the other end of the first parallel body is grounded, and the other end of the first series body is grounded;

a second left-handed resonator that is connected in parallel with the first left-handed resonator and between the input port and the output port, said second left-handed resonator including

a second series body in which an inductor and a capacitor are connected in series, and

a second parallel body in which an inductor and a capacitor are connected in parallel, wherein one end of the second series body and one end of the second parallel body are connected to the output port via the second inductor, the other end of the second parallel body is grounded, and the other end of the second series body is grounded;

a coupling element that is connected between the one end of the first series body of the first left-handed resonator and the one end of the second series body of the second left-handed resonator, wherein

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

the other end of the first left-handed resonator and the other end of the second left-handed resonator are grounded, and

the second left-handed resonator resonates in a −

1-order mode while exciting a quarter wavelength mode only with the second series body and the second parallel body.

8. The left-handed filter according to claim 7, wherein the first left-handed resonator resonates in a −

1-order mode while exciting a quarter wavelength mode.

9. The left-handed filter according to claim 8, wherein the first left-handed resonator resonates in a −

1-order mode while exciting a quarter wavelength mode only with the first series body and the first parallel body.