# US 10,484,117 B1 · Polarization filter systems and methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,117 B1 - Document ID: US10484117B1 - Status: Granted - Kind: B1 - Application number: 16/103,720 - Filed: 2018-08-14 - Granted: 2019-11-19 - Earliest claimed: 2018-06-20 - Assignees: Lattice Semiconductor Corporation - Applicants: Lattice Semiconductor Corporation - Inventors: Rongrong Lu; Ron Zeng - Web page: https://patentgrep.com/patent/US10484117B1 ## CPC - H04J 1/12: Arrangements for reducing cross-talk between channels {(in line transmission systems H04B3/32; in cables or lines H04B3/26 - H04B3/30)} - H01Q 1/38: formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142)} - H01Q 1/528: {reducing the re-radiation of a support structure (in a parabolic reflector antenna H01Q19/023)} - H04B 1/40: Circuits - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Systems and methods for dual channel polarization filter structures are disclosed. An example wireless communication system includes a first transceiver module of a wireless communication system configured to form one or more linearly polarized communication links with a second transceiver module of the wireless communication system, and a dual channel polarization filter structure positioned between the first and second transceiver modules and configured to filter the one or more linearly polarized communication links to produce corresponding one or more filtered linearly polarized communication links. The dual channel polarization filter structure includes first and second filter channels each formed from three structural layers including at least one metalized layer printed circuit board (PCB) disposed between the remaining two structural layers, and each filter channel includes an array of filter elements each comprising at least one metamaterial absorber arrangement. ## Claims ### Claim 1 A device comprising: a first transceiver module of a wireless communication system configured to faun one or more linearly polarized communication links with a second transceiver module of the wireless communication system; and a dual channel polarization filter structure positioned between the first and second transceiver modules and configured to filter the one or more linearly polarized communication links to produce corresponding one or more filtered linearly polarized communication links; wherein the dual channel polarization filter structure comprises first and second filter channels each formed from three structural layers including at least one metalized layer disposed between the remaining two structural layers, and wherein each filter channel comprises an array of filter elements each comprising at least one metamaterial absorber arrangement. ### Claim 2 (depends on 1) The device of claim 1, wherein each metamaterial absorber arrangement comprises: a rectangular patterned resistive strip formed in a top structural layer of the three structural layers; and a rectangular patterned slot formed in the at least one metalized layer, wherein the rectangular patterned resistive strip formed in the top structural layer is spatially aligned over the rectangular patterned slot and separated from the rectangular patterned slot by a substrate of the top structural layer. ### Claim 3 (depends on 1) The device of claim 1, wherein each metamaterial absorber arrangement comprises: a rectangular patterned resistive strip formed in a bottom structural layer of the three structural layers; and a rectangular patterned slot formed in the at least one metalized layer, wherein the rectangular patterned resistive strip formed in the bottom structural layer is spatially aligned over the rectangular patterned slot and separated from the rectangular patterned slot by a substrate of the bottom structural layer. ### Claim 4 (depends on 1) The device of claim 1, wherein: the first filter channel of the dual channel polarization filter is aligned orthogonally relative to the second filter channel of the dual channel polarization filter. ### Claim 5 (depends on 1) The device of claim 1, wherein: the first filter channel of the dual channel polarization filter is coupled and/or affixed to the first or second transceiver module. ### Claim 6 (depends on 1) The device of claim 1, wherein the dual channel polarization filter structure comprises a first dual channel polarization filter structure, the device further comprising: a second dual channel polarization filter structure positioned between the second transceiver module and the first dual channel polarization filter structure and configured to filter the one or more linearly polarized communication links and/or the one or more filtered linearly polarized communication links produced by the first dual channel polarization filter. ### Claim 7 (depends on 1) A method of operating a client device coupled to the second transceiver module using the device of claim 1, the method comprising: initializing the client device by communicating one or more control and/or data signals over the one or more filtered linearly polarized wireless communication links produced by the dual channel polarization filter structure; communicating data with the client device by communicating the data over the one or more filtered linearly polarized wireless communication links produced by the dual channel polarization filter structure; and placing the client device in a low power consumption mode. ### Claim 8 (depends on 1) A method for forming the device of claim 1, comprising: forming the first filter channel of the dual channel polarization filter structure; forming the second filter channel of the dual channel polarization filter structure; and positioning the first and second filter channels of the dual channel polarization filter structure between the first and second transceiver modules. ### Claim 9 (depends on 8) The method of claim 8, wherein the forming the first filter channel comprises: patterning a top structural layer of the first filter channel to form a first array of rectangular patterned resistive strips on a front surface of the top structural layer; patterning a middle structural layer of the first filter channel to form an array of rectangular patterned slots in the at least one metalized layer of the middle structural layer; patterning a bottom structural layer of the first filter channel to form a second array of rectangular patterned resistive strips on a back surface of the bottom structural layer, wherein the bottom structural layer is patterned to form a mirror image of the patterned top structural layer; and adhering a back surface of the top structural layer to a front surface of the middle structural layer, and a front surface of the bottom structural layer to a back surface of the middle structural layer, to form the first filter channel. ### Claim 10 A wireless communication system, comprising: a first transceiver module configured to form one or more linearly polarized communication links with a second transceiver module; a host coupled to the first transceiver module and configured to control operation of a client device coupled to the second transceiver module over the one or more linearly polarized communication links; a dual channel polarization filter structure positioned between the first and second transceiver modules and configured to filter the one or more linearly polarized communication links to produce corresponding one or more filtered linearly polarized communication links; and a memory configured to store a plurality of computer readable instructions which when executed by the host and/or a client controller are adapted to cause the wireless communication system to perform a method comprising: initializing the client device by communicating one or more control and/or data signals over the one or more filtered linearly polarized wireless communication links produced by the dual channel polarization filter structure; communicating data with the client device by communicating the data over the one or more filtered linearly polarized wireless communication links produced by the dual channel polarization filter structure; and placing the client device in a low power consumption mode. ### Claim 11 (depends on 10) The system of claim 10, wherein the dual channel polarization filter structure comprises a filter channel formed from three structural layers including at least one metalized layer disposed between the remaining two structural layers, the filter channel comprises an array of filter elements each comprising at least one metamaterial absorber arrangement, and each metamaterial absorber arrangement comprises: a rectangular patterned resistive strip formed in a top structural layer of the three structural layers; and a rectangular patterned slot formed in the at least one metalized layer, wherein the rectangular patterned resistive strip formed in the top structural layer is spatially aligned over the rectangular patterned slot and separated from the rectangular patterned slot by a substrate of the top structural layer. ### Claim 12 (depends on 10) The system of claim 10, wherein the dual channel polarization filter structure comprises at least one metamaterial absorber arrangement, and wherein each metamaterial absorber arrangement comprises: a rectangular patterned resistive strip formed in a bottom structural layer of the three structural layers; and a rectangular patterned slot formed in the at least one metalized layer, wherein the rectangular patterned resistive strip formed in the bottom structural layer is spatially aligned over the rectangular patterned slot and separated from the rectangular patterned slot by a substrate of the bottom structural layer. ### Claim 13 (depends on 10) The system of claim 10, wherein: a first filter channel of the dual channel polarization filter is aligned orthogonally relative to a second filter channel of the dual channel polarization filter. ### Claim 14 (depends on 10) The system of claim 10, wherein: a first filter channel of the dual channel polarization filter is coupled and/or affixed to the first or second transceiver module. ### Claim 15 (depends on 10) The system of claim 10, wherein the dual channel polarization filter structure comprises a first dual channel polarization filter structure, the device further comprising: a second dual channel polarization filter structure positioned between the second transceiver module and the first dual channel polarization filter structure and configured to filter the one or more linearly polarized communication links and/or the one or more filtered linearly polarized communication links produced by the first dual channel polarization filter. ### Claim 16 A method for forming a dual channel polarization filter structure for a wireless communication system, the method comprising: forming a first filter channel of the dual channel polarization filter structure; and forming the second filter channel of the dual channel polarization filter structure; wherein the first and second filter channels are each formed from three structural layers including at least one metalized layer disposed between the remaining two structural layers, and wherein each filter channel comprises an array of filter elements each comprising at least one metamaterial absorber arrangement. ### Claim 17 (depends on 16) The method of claim 16, wherein the forming the first filter channel comprises: patterning a top structural layer of the first filter channel to form a first array of rectangular patterned resistive strips on a front surface of the top structural layer; patterning a middle structural layer of the first filter channel to form an array of rectangular patterned slots in the at least one metalized layer of the middle structural layer; patterning a bottom structural layer of the first filter channel to form a second array of rectangular patterned resistive strips on a back surface of the bottom structural layer, wherein the bottom structural layer is patterned to form a mirror image of the patterned top structural layer; and adhering a back surface of the top structural layer to a front surface of the middle structural layer, and a front surface of the bottom structural layer to a back surface of the middle structural layer, to form the first filter channel. ### Claim 18 (depends on 16) The method of claim 16, wherein each metamaterial absorber arrangement comprises: a rectangular patterned resistive strip formed in a top structural layer of the three structural layers; and a rectangular patterned slot formed in the at least one metalized layer, wherein the rectangular patterned resistive strip formed in the top structural layer is spatially aligned over the rectangular patterned slot and separated from the rectangular patterned slot by a substrate of the top structural layer. ### Claim 19 (depends on 16) The method of claim 16, wherein each metamaterial absorber arrangement comprises: a rectangular patterned resistive strip formed in a bottom structural layer of the three structural layers; and a rectangular patterned slot formed in the at least one metalized layer, wherein the rectangular patterned resistive strip formed in the bottom structural layer is spatially aligned over the rectangular patterned slot and separated from the rectangular patterned slot by a substrate of the bottom structural layer. ### Claim 20 (depends on 16) The method of claim 16, wherein: the first filter channel of the dual channel polarization filter is aligned orthogonally relative to the second filter channel of the dual channel polarization filter.