# US 2017/0288633 A1 · High pass filter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288633 A1 - Document ID: US20170288633A1 - Status: Published application - Kind: A1 - Application number: 15/470,946 - Filed: 2017-03-28 - Published: 2017-10-05 - Earliest claimed: 2016-03-31 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Satoshi ASADA; Hiroshi MASUDA - Web page: https://patentgrep.com/patent/US20170288633A1 ## CPC - H03H 7/0115: {comprising only inductors and capacitors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence)} - H01P 1/20345: {Multilayer filters} - H03H 7/175: {Series LC in series path (H03H7/1783 takes precedence)} - H03H 7/1758: {Series LC in shunt or branch path (H03H7/1791 takes precedence)} - H03H 2001/0085: {Multilayer, e.g. LTCC, HTCC, green sheets} - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) ## Abstract A high pass filter includes a first LC series resonator including a first end connected to a signal path, and a second end connected to at least one ground terminal, a second LC series resonator including a third end electrically connected to the signal path, and a fourth end connected to the at least one ground terminal, and a third capacitor between a first portion extending from a first capacitor to a first inductor and a second portion extending from a second capacitor to a second inductor. ## Claims ### Claim 1 A high pass filter comprising: a first input and output terminal; a second input and output terminal; at least one ground terminal; a signal path disposed between the first input and output terminal and the second input and output terminal; a first inductor; a first capacitor; a first LC series resonator including a first end electrically connected to the signal path, a second end electrically connected to the at least one ground terminal, the first inductor, and the first capacitor; a second inductor; a second capacitor; a second LC series resonator including a third end electrically connected to the signal path, a fourth end electrically connected to the at least one ground terminal, the second inductor, and the second capacitor; and a third capacitor provided between a first portion and a second portion, the first portion extending from a first electrode of the first capacitor that is electrically connected to the first inductor to a portion of the first inductor closer to the first electrode than an end of the first inductor that is not electrically connected to the first capacitor, the second portion extending from a second electrode of the second capacitor that is electrically connected to the second inductor to a portion of the second inductor closer to the second electrode than an end of the second inductor that is not electrically connected to the second capacitor. ### Claim 2 (depends on 1) The high pass filter according to claim 1, further comprising: a multilayer body including a stack of a plurality of insulator layers in a stacking direction; wherein the first LC series resonator includes at least one first conductor layer disposed on a corresponding one of the plurality of insulator layers; the second LC series resonator includes at least one second conductor layer disposed on a corresponding one of the plurality of insulator layers; and the third capacitor includes a first capacitor conductor layer facing at least one of the at least one first conductor layer and the at least one second conductor layer, with a corresponding at least one of the plurality of insulator layers interposed therebetween. ### Claim 3 (depends on 2) The high pass filter according to claim 2, wherein the at least one first conductor layer includes at least one first inductor conductor layer wound in a predetermined direction when viewed in the stacking direction and a second capacitor conductor layer; and the at least one second conductor layer includes at least one second inductor conductor layer wound in a direction opposite to the predetermined direction when viewed in the stacking direction and a third capacitor conductor layer. ### Claim 4 (depends on 3) The high pass filter according to claim 3, wherein the first capacitor conductor layer faces the second capacitor conductor layer and the third capacitor conductor layer with a corresponding at least one of the plurality of insulator layers interposed therebetween, and is disposed closer to the second capacitor conductor layer and the third capacitor conductor layer than to the at least one first inductor conductor layer and the at least one second inductor conductor layer. ### Claim 5 (depends on 3) The high pass filter according to claim 3, wherein the first capacitor conductor layer faces the at least one first inductor conductor layer and the at least one second inductor conductor layer with a corresponding at least one of the plurality of insulator layers interposed therebetween, and is disposed closer to the at least one first inductor conductor layer and the at least one second inductor conductor layer than to the second capacitor conductor layer and the third capacitor conductor layer. ### Claim 6 (depends on 3) The high pass filter according to claim 3, wherein the first inductor includes a first via-hole conductor passing through corresponding ones of the plurality of insulator layers in the stacking direction and electrically connecting the at least one first inductor conductor layer to the second capacitor conductor layer; and the first capacitor conductor layer is electrically connected to the first via-hole conductor, faces the third capacitor conductor layer with a corresponding at least one of the plurality of insulator layers interposed therebetween, and is disposed closer to the third capacitor conductor layer than to the at least one second inductor conductor layer. ### Claim 7 (depends on 3) The high pass filter according to claim 3, wherein the first inductor includes a first via-hole conductor passing through corresponding ones of the plurality of insulator layers in the stacking direction and electrically connecting the at least one first inductor conductor layer to the second capacitor conductor layer; and the first capacitor conductor layer is electrically connected to the first via-hole conductor, faces the at least one second inductor conductor layer with a corresponding at least one of the plurality of the insulator layers interposed therebetween, and is disposed closer to the at least one second inductor conductor layer than to the third capacitor conductor layer. ### Claim 8 (depends on 3) The high pass filter according to claim 3, wherein the plurality of first inductor conductor layers are electrically connected with at least one via-hole conductor such that the first inductor is provided with a helical or substantially helical shape extending in the stacking direction while being wound in the predetermined direction when viewed in the stacking direction; and the plurality of second inductor conductor layers are electrically connected with at least one via-hole conductor such that the second inductor is provided with a helical or substantially helical shape extending in the stacking direction while being wound in a direction opposite the predetermined direction when viewed in the stacking direction. ### Claim 9 (depends on 8) The high pass filter according to claim 8, wherein the at least one ground terminal includes a bottom portion on a surface located on one side of the multilayer body in the stacking direction; and an end of the first inductor on the other side of the multilayer body in the stacking direction and an end of the second inductor on the other side of the multilayer body in the stacking direction are electrically connected by the bottom portion. ### Claim 10 (depends on 9) The high pass filter according to claim 9, wherein the second capacitor and the third capacitor are located closer to the other side of the multilayer body in the stacking direction than the first inductor and the second inductor. ### Claim 11 (depends on 2) The high pass filter according to claim 2, wherein the first capacitor is located below the first inductor in the stacking direction. ### Claim 12 (depends on 2) The high pass filter according to claim 2, wherein the first input and output terminal includes a top portion located at a left rear corner portion of a top surface of the multilayer body, a bottom portion located at a left rear corner portion of a bottom surface of the multilayer body, and a side portion located on a rear surface of the multilayer body. ### Claim 13 (depends on 2) The high pass filter according to claim 2, wherein the second input and output terminal includes a top portion located at a right rear corner portion of a top surface of the multilayer body, a bottom portion located at a right rear corner portion of a bottom surface of the multilayer body, and a side portion located on a rear surface of the multilayer body. ### Claim 14 (depends on 2) The high pass filter according to claim 2, wherein the ground terminal includes a top portion located at a left front corner portion of a top surface of the multilayer body, a bottom portion located at a left front corner portion of a bottom surface of the multilayer body, and a side portion located on a front surface of the multilayer body. ### Claim 15 (depends on 2) The high pass filter according to claim 2, wherein the ground terminal includes a top portion located at a right front corner portion of a top surface of the multilayer body, a bottom portion located at a right front corner portion of a bottom surface of the multilayer body, and a side portion located on a front surface of the multilayer body. ### Claim 16 (depends on 1) The high pass filter according to claim 1, wherein the first input and output terminal, the second input and output terminal, and the at least one ground terminal are formed by applying Ni plating, Sn plating, or Au plating onto a base electrode that includes Ag or Cu. ### Claim 17 (depends on 3) The high pass filter according to claim 3, wherein at least one of the first inductor and the second inductor is formed in a spiral shape. ### Claim 18 (depends on 1) The high pass filter according to claim 1, wherein a capacitor conductor layer of the first LC series resonator at least partially overlaps with a capacitor conductor layer of the first capacitor when viewed from above. ### Claim 19 (depends on 18) The high pass filter according to claim 18, wherein the capacitor conductor layer of the first LC series resonator and the capacitor conductor layer of the first capacitor have a same or similar shape when viewed from above.