# US 2014/0152412 A1 · High-power variable inductor and filter employing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152412 A1 - Document ID: US20140152412A1 - Status: Published application - Kind: A1 - Application number: 14/095,544 - Filed: 2013-12-03 - Published: 2014-06-05 - Earliest claimed: 2012-12-03 - Assignees: Pstek Co., Ltd. - Applicants: PSTEK Co., Ltd. - Inventors: Jae Taek LEE - Web page: https://patentgrep.com/patent/US20140152412A1 ## CPC - H03H 7/00: Multiple-port networks comprising only passive electrical elements as network components - H01F 21/12: discontinuously variable, e.g. tapped - H03H 7/075: Ladder networks, e.g. electric wave filters - H03H 7/425: {Balance-balance networks} - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract The present disclosure provides a high-power variable inductor and a filter employing the same. A provided variable inductor comprises a first inductor and a second inductor. The first inductor is connected to a first input terminal and to a first output terminal of a two-port circuit. The second inductor is connected to a second input terminal and to a second output terminal of the two-port circuit. The first inductor and the second inductor are symmetrical to each other and jointly surround an adjustable area for varying an inductance of the variable inductor. ## Claims ### Claim 1 A variable inductor, comprising: a first inductor connected to a first input terminal and to a first output terminal of a two-port circuit; and a second inductor connected to a second input terminal and to a second output terminal of the two-port circuit, wherein the first inductor and the second inductor are symmetrical to each other and jointly surround an adjustable area for varying an inductance of the variable inductor. ### Claim 2 (depends on 1) The variable inductor of claim 1, wherein the first inductor comprises: a first support plate and a second support plate arranged in parallel to each other for jointly supporting the first inductor; and a first connecting plate extending perpendicular to and connecting the first support plate and the second support plate together. ### Claim 3 (depends on 2) The variable inductor of claim 2, wherein the second inductor comprises: a third support plate and a fourth support plate arranged in parallel to each other for jointly supporting the second inductor; and a second connecting plate extending perpendicular to and connecting the third support plate and the fourth support plate together. ### Claim 4 (depends on 3) The variable inductor of claim 3, wherein the first connecting plate and the second connecting plate extend in parallel, the first support plate and the third support plate are coplanar with each other, and the second support plate and the fourth support plate are coplanar with each other. ### Claim 5 (depends on 3) The variable inductor of claim 3, further comprising a couple of external terminals, respectively for the first and the second support plates at a predetermined distance from the first connecting plate toward the second connecting plate, and another couple of external terminals, respectively for the third and the fourth support plates at the predetermined distance from the second connecting plate toward the first connecting plate. ### Claim 6 (depends on 5) The variable inductor of claim 5, wherein the first inductor and the second inductor receive input currents which are in phase, and the input current to the first support plate is in the opposite direction of the input current to the third support plate. ### Claim 7 (depends on 5) The variable inductor of claim 5, wherein the first inductor and the second inductor have an interposed ground plane insulated from the first inductor and the second inductor. ### Claim 8 (depends on 5) The variable inductor of claim 5, wherein the first and the second support plates respectively have one or more fastening holes on contact lines between the first and the second support plates and the first connecting plate as the first connecting plate has a plurality of holes corresponding to the fastening holes and residing on contact planes between the first and the second support plates, and wherein the third and the fourth support plates respectively have one or more fastening holes on contact lines between the third and the fourth support plates and the second connecting plate as the second connecting plate has a plurality of holes corresponding to the fastening holes and residing on contact planes between the third and the fourth support plates. ### Claim 9 (depends on 8) The variable inductor of claim 8, wherein the first through the fourth support plates respectively have the fastening holes arranged in one or more rows. ### Claim 10 A low-pass filter, comprising: a first module configured to have a predetermined number of indented conductive elements with a series of bends repeated in a row; and a second module configured to have the predetermined number of indented conductive elements with the inversion of the series of bends repeated in a row, wherein the first module and the second module are arranged symmetrically by opposing each other. ### Claim 11 (depends on 10) The low-pass filter of claim 10, wherein the first module and the second module respectively have capacitors interposed therebetween with first ends connected to the first module and to the second module and second ends connected to ground. ### Claim 12 (depends on 10) The low-pass filter of claim 10, further comprising a conductive case for providing an electromagnetic shield against outside influences. ### Claim 13 (depends on 11) The low-pass filter of claim 11, further comprising a ground plate provided between the first module and the second module. ### Claim 14 (depends on 13) The low-pass filter of claim 13, further comprising a conductive case for providing an electromagnetic shield against outside influences, and wherein the ground plate is grounded through the conductive case.