# US 2018/0323485 A1 · Miniature ltcc coupled stripline resonator filters for digital receivers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0323485 A1 - Document ID: US20180323485A1 - Status: Published application - Kind: A1 - Application number: 15/584,191 - Filed: 2017-05-02 - Published: 2018-11-08 - Earliest claimed: 2017-05-02 - Assignees: BAE Systems Information and Electronic Systems Integration Inc. - Applicants: BAE SYSTEMS Information and Electronic Systems Integration Inc. - Inventors: Souleymane GNANOU; James M. HUGGETT - Web page: https://patentgrep.com/patent/US20180323485A1 ## CPC - H01P 1/20345: {Multilayer filters} - H01P 7/08: Strip line resonators - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) ## Abstract LTCC coupled stripline resonator filters for use as bandpass filters are implemented with combline topology or with interdigital topology. The filter bandwidths range from about 0.3 GHz to about 4.5 GHz, or higher, depending of the manufacturing limitations with frequency operation of about 0.1 GHz to about 100 GHz. The filters have a plurality of through plated vias extending through the filters and connecting the top and bottom ground layers to form electric walls thereby reducing the coupling between the adjacent resonators. ## Claims ### Claim 1 A low temperature co-fired ceramic stripline resonator filter comprising a first layer configured as a ground layer comprising a metal; a second layer comprising a dielectric material; a third layer configured as a conductor layer comprising the metal and the dielectric material, the metal comprising a plurality of resonators comprising a first half of a stripline resonator pair arranged with an interdigital topology; a fourth layer comprising the dielectric material; a fifth layer configured as a conductor layer comprising the metal and the dielectric material, the metal comprising a plurality of resonators comprising a second half of the stripline resonator pair arranged with an interdigital topology; a sixth layer comprising the dielectric material; a seventh layer configured as a ground layer comprising a metal; wherein the first, second, third, fourth, fifth, sixth and seventh layers are assembled to form an RF filter having a width, a length, a thickness, a first end and a second end, and a first side and a second side; a plurality of perimeter through plated vias spaced apart along the length of the first side and along the length of the second side of the RF filter and extending through the RF filter from the first layer to the seventh layer creating a series of electric walls to contain electromagnetic fields inside the RF filter; and a plurality of through plated vias located between adjacent resonators and extending through the RF filter from the first layer to the seventh layer to create a series of electric walls thereby reducing the coupling between the two adjacent resonators. ### Claim 2 (depends on 1) The low temperature co-fired ceramic stripline resonator filter of claim 1, wherein the dielectric material is any LTCC low loss dielectric material. ### Claim 3 (depends on 1) The low temperature co-fired ceramic stripline resonator filter of claim 1, wherein the metal is selected from gold or silver. ### Claim 4 (depends on 1) The low temperature co-fired ceramic stripline resonator filter of claim 1, wherein the filter is a narrowband filter with a bandwidth of about 0.3 GHz to less than 1 GHz. ### Claim 5 (depends on 1) The low temperature co-fired ceramic stripline resonator filter of claim 1, wherein the filter has a center frequency ranging from 0.1 GHz to about 100 GHz. ### Claim 6 (depends on 1) The low temperature co-fired ceramic stripline resonator filter of claim 1, wherein the plurality of resonator poles is between four and fourteen. ### Claim 7 A low temperature co-fired ceramic stripline resonator filter comprising a first layer configured as a ground layer comprising a metal; a second layer comprising a dielectric material; a third layer configured as a conductor layer comprising the metal and the dielectric material, the metal comprising a plurality of resonators comprising a first half of a stripline resonator pair arranged with an interdigital topology; a fourth layer comprising the dielectric material; a fifth layer configured as a conductor layer comprising the metal and the dielectric material, the metal comprising a plurality of resonators comprising a second half of the stripline resonator pair arranged with an interdigital topology; a sixth layer comprising the dielectric material; a seventh layer configured as a ground layer comprising a metal; wherein the first, second, third, fourth, fifth, sixth and seventh layers are assembled to form an RF filter having a width, a length, a thickness, a first end and a second end, and a first side and a second side; and a plurality of perimeter through plated vias spaced apart along the length of the first side and along the length of the second side of the RF filter and extending through the RF filter from the first layer to the seventh layer creating a series of electric walls to contain electromagnetic fields inside the RF filter. ### Claim 8 (depends on 7) The low temperature co-fired ceramic stripline resonator filter of claim 7, wherein the dielectric material is any LTCC low loss dielectric material. ### Claim 9 (depends on 7) The low temperature co-fired ceramic stripline resonator filter of claim 7, wherein the metal is selected from gold or silver. ### Claim 10 (depends on 7) The low temperature co-fired ceramic stripline resonator filter of claim 7, wherein the filter is a broadband filter with a bandwidth greater than 1 GHz. ### Claim 11 (depends on 7) The low temperature co-fired ceramic stripline resonator filter of claim 7, wherein the filter has a center frequency ranging from 0.1 GHz to about 100 GHz. ### Claim 12 (depends on 7) The low temperature co-fired ceramic stripline resonator filter of claim 7, wherein the plurality of resonator poles is between four and fourteen. ### Claim 13 A low temperature co-fired ceramic stripline resonator filter comprising a first layer configured as a ground layer comprising a metal; a second layer comprising a dielectric material; a third layer configured as a conductor layer comprising the metal and the dielectric material, the metal comprising a plurality of resonators comprising a first half of a stripline resonator pair arranged with a combline topology; a fourth layer comprising the dielectric material; a fifth layer configured as a conductor layer comprising the metal and the dielectric material, the metal comprising a plurality of resonators comprising a second half of the stripline resonator pair arranged with a combline topology; a sixth layer comprising the dielectric material; a seventh layer configured as a ground layer comprising a metal; wherein the first, second, third, fourth, fifth, sixth and seventh layers are assembled to form an RF filter having a width, a length, a thickness, a first end and a second end, and a first side and a second side; and a plurality of perimeter through plated vias spaced apart along the length of the first side and along the length of the second side of the RF filter and extending through the RF filter from the first layer to the seventh layer creating a series of electric walls to contain electromagnetic fields inside the RF filter. ### Claim 14 (depends on 13) The low temperature co-fired ceramic stripline resonator filter of claim 13, wherein the dielectric material is any LTCC low loss dielectric material. ### Claim 15 (depends on 13) The low temperature co-fired ceramic stripline resonator filter of claim 13, wherein the metal is selected from gold or silver. ### Claim 16 (depends on 13) The low temperature co-fired ceramic stripline resonator filter of claim 13, wherein the filter is a broadband filter with a bandwidth greater than 1 GHz. ### Claim 17 (depends on 13) The low temperature co-fired ceramic stripline resonator filter of claim 13, wherein the filter has a center frequency ranging from 0.1 GHz to about 100 GHz. ### Claim 18 (depends on 13) The low temperature co-fired ceramic stripline resonator filter of claim 13, wherein the plurality of resonator poles is between four and fourteen.