TUNABLE RESONATOR AND TUNABLE FILTER

• US 20090115555A1
• Filed: 03/11/2008
• Published: 05/07/2009
• Est. Priority Date: 11/01/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Yun, Sang-won, Cho, Young-ho, Song, In-sang, Kim, Duck-hwan, Kim, Chul-soo, Ha, Byeong-ju
• Granted Patent: US 8,410,871 B2
• Time in Patent Office: Days
• US Class Current: 333/205
• CPC Class Codes: H01P 1/20336 Comb or interdigital filters

Abstract

A tunable filter is provided which includes a filter unit comprising a pair of microstrips which are disposed facing each other, a capacitor unit connected to one side of the filter unit, and an adjustment unit for regulating the length of each of the pair of microstrips to adjust inductance of the filter unit, the adjustment unit being connected to the opposite side of the filter unit. The length of the microstrips may thereby be regulated in order to vary the frequency band.

Claims

1. A tunable resonator comprising:

a line unit formed as a microstrip;

a capacitor unit connected to a first side of the line unit; and

an adjustment unit for regulating a length of the line unit to adjust inductance, the adjustment unit being connected to a second side of the line unit opposite the first side.

2. The tunable resonator of claim 1, wherein the adjustment unit comprises:

an auxiliary line unit disposed on the second side of the line unit; and

a switch for selectively connecting the line unit to the auxiliary line unit in response to an external control signal.

3. The tunable resonator of claim 2, wherein the auxiliary line unit comprises a plurality of auxiliary microstrips having different lengths, and

the switch selectively connects the line unit to at least one of the plurality of auxiliary microstrips in response to the external control signal.

4. The tunable resonator of claim 1, wherein the adjustment unit comprises:

a plurality of auxiliary line units sequentially disposed on the second side of the line unit; and

a plurality of switches for connecting the plurality of auxiliary line units,

wherein the plurality of auxiliary line units and plurality of switches are connected in a cascade configuration.

5. The tunable resonator of claim 4, wherein the plurality of auxiliary line units comprises a plurality of auxiliary microstrips of different lengths.

6. The tunable resonator of claim 1, wherein the capacitor unit comprises a variable capacitor.

7. A tunable filter comprising:

a filter unit comprising a pair of microstrips which are disposed adjacent to each other;

a capacitor unit connected to a first side of the filter unit; and

an adjustment unit for regulating the length of each of the pair of microstrips to adjust the inductance of the tunable filter, the adjustment unit being connected to a second side opposite the first side of the filter unit.

8. The tunable filter of claim 7, wherein the adjustment unit comprises:

an auxiliary line unit disposed on the second side of the filter unit; and

a switch for selectively connecting the filter unit to the auxiliary line unit in response to an external control signal.

9. The tunable filter of claim 7, wherein the adjustment unit comprises:

a plurality of auxiliary line units sequentially disposed on the second side of the filter unit; and

a plurality of switches for connecting the plurality of auxiliary line units,

wherein the plurality of auxiliary line units and plurality of switches are connected in a cascade configuration.

10. The tunable filter of claim 9, wherein the plurality of auxiliary line units comprises a plurality of auxiliary microstrips of different lengths.

11. The tunable filter of claim 7, wherein the capacitor unit comprises a variable capacitor.