# US 2019/0357348 A1 · Multiband filter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0357348 A1 - Document ID: US20190357348A1 - Status: Published application - Kind: A1 - Application number: 16/331,292 - Filed: 2016-11-08 - Published: 2019-11-21 - Earliest claimed: 2016-11-08 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Takeshi YUASA; Takeshi OSHIMA; Hiroyuki AOYAMA - Web page: https://patentgrep.com/patent/US20190357348A1 ## CPC - H05K 1/0233: {Filters, inductors or a magnetic substance} - H01P 1/2039: {Galvanic coupling between Input/Output} - H03H 7/01: Frequency selective two-port networks - H03H 7/38: Impedance-matching networks - H03H 7/46: Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source - H03H 9/6406: {Filters characterised by a particular frequency characteristic} - H03H 9/72: Networks using surface acoustic waves - H05K 1/0243: {Printed circuits associated with mounted high frequency components} - H05K 1/025: {Impedance arrangements, e.g. impedance matching, reduction of parasitic impedance (H05K1/024 and H05K1/0243 take precedence; for semiconductor devices H10W44/20)} - H03H 9/0542: {consisting of a lateral arrangement (H03H9/0566 takes precedence)} - H05K 2201/09227: Layout details of a plurality of traces, e.g. escape layout for Ball Grid Array [BGA] mounting - H05K 2201/09727: Varying width along a single conductor; Conductors or pads having different widths - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) ## Abstract The multiband filter includes a printed circuit board, a first filter, a second filter having an outer dimension different from that of the first filter and passband frequencies higher than those of the first filter, an input terminal, an output terminal, a first inductor, a first capacitor, which are connected except the first capacitor by signal line conductor patterns to form a first transmission line, which connect the second filter, the input terminal, the output terminal, and the first capacitor to form a second transmission line, a part thereof in the first transmission line being arranged in an area on the printed circuit board, formed by the difference between the outer dimensions of the first and the second filters, to achieve desirable passbands and enough attenuation in a suppression band outside the passbands. ## Claims ### Claim 1 A multiband filter comprising: a printed circuit board on which parts are arranged; a first filter installed on the printed circuit board; a second filter having an outer dimension different from that of the first filter and passband frequencies higher than those of the first filter, and installed on the printed circuit board; an input terminal to which a signal is inputted from an outside; an output terminal via which a signal is outputted to an outside; a first inductor arranged in at least one of space between the input terminal and the first filter, and space between the output terminal and the first filter; a first capacitor arranged in at least one of space between the input terminal and the second filter, and space between the output terminal and the second filter; and signal line conductor patterns for connecting the first filter, the input terminal, the output terminal, and the first inductor, to form a first transmission line, and also connecting the second filter, the input terminal, the output terminal, and the first capacitor, to form a second transmission line, a part thereof belonging to the first transmission line being arranged in an area on the printed circuit board, the area being formed by a difference between the outer dimensions of the first and the second filters. ### Claim 2 (depends on 1) The multiband filter according to claim 1, wherein the first transmission line is longer than the second transmission line. ### Claim 3 (depends on 1) The multiband filter according to claim 1, wherein the first filter is larger than the second filter, and the second filter, the first inductor, and the first capacitor are arranged in a row along an identical direction. ### Claim 4 (depends on 1) The multiband filter according to claim 1, wherein the second filter is larger than the first filter. ### Claim 5 (depends on 1) The multiband filter according to claim 1, wherein a signal line conductor pattern connecting the first filter and the first inductor has lower impedance than that of another signal line conductor pattern. ### Claim 6 (depends on 1) The multiband filter according to claim 1, further comprising: a signal line short circuiting conductor pattern for forming a short circuit part short-circuited to a ground; and a second capacitor connected to the short circuit part, and wherein a signal line conductor pattern is connected to the second capacitor and forms a third transmission line branching from the first transmission line. ### Claim 7 (depends on 6) The multiband filter according to claim 6, further comprising: a second inductor arranged between a branch point between the first transmission line and the third transmission line, and the first filter, and connected in series to the first inductor. ### Claim 8 (depends on 6) The multiband filter according to claim 6, wherein the signal line conductor pattern forming the third transmission line, the short circuit part, and the second capacitor are arranged inside an area surrounded by the first and the second transmission lines, and the first and the second filters. ### Claim 9 (depends on 1) The multiband filter according to claim 1, further comprising: a fourth transmission line formed by a signal line conductor pattern branching from a signal line conductor pattern arranged between the first capacitor and the first inductor; a third filter arranged in such a way as to be connected to the fourth transmission line and having passband frequencies higher than those of the second filter; and a third capacitor connected to the third filter. ### Claim 10 (depends on 1) The multiband filter according to claim 1, further comprising: a fourth transmission line formed by a signal line conductor pattern branching from a signal line conductor pattern arranged between the first capacitor and the first inductor; a third filter arranged in such a way as to be connected to the fourth transmission line, and having passband frequencies different from those of the first and second filters and lower than those of the second filter; and a third inductor connected to the third filter. ### Claim 11 (depends on 1) The multiband filter according to claim 1, further comprising: a fifth transmission line formed by a signal line conductor pattern branching from a signal line conductor pattern arranged between the first inductor and the first filter; a third filter arranged in such a way as to be connected to the fifth transmission line, and having passband frequencies different from those of the first and second filters and lower than those of the second filter; and a fourth inductor connected to the third filter.