# US 9,883,296 B2 · Filter to suppress harmonics for an antenna > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,883,296 B2 - Document ID: US9883296B2 - Status: Granted - Kind: B2 - Application number: 14/559,560 - Filed: 2014-12-03 - Published: 2016-06-09 - Granted: 2018-01-30 - Earliest claimed: 2014-12-03 - Assignees: Starkey Laboratories, Inc. - Applicants: Starkey Laboratories, Inc. - Inventors: Stephen Paul Flood - Web page: https://patentgrep.com/patent/US9883296B2 ## CPC - H04R 25/554: {using a wireless connection, e.g. between microphone and amplifier or using Tcoils} - H03H 7/38: Impedance-matching networks - H04R 2225/51: Aspects of antennas or their circuitry in or for hearing aids - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) ## Abstract Disclosed herein, among other things, are systems and methods for filtering to suppress harmonics for a hearing assistance device antenna. One aspect of the present subject matter includes a hearing assistance system for a wearer including a wireless radio frequency (RF) transceiver, an antenna and a filter connected between the RF transceiver and the antenna. According to various embodiments, the filter is configured to suppress harmonics for the antenna, and configured to maintain impedance and prevent inversion of impedance presented to the RF transceiver from the antenna. ## Claims ### Claim 1 A hearing assistance device, comprising: a microphone; a wireless radio frequency (RF) transceiver including antenna match circuitry; hearing assistance electronics connected to the microphone and the RF transceiver; an antenna; and a balanced low pass filter connected between the antenna match circuitry of the RF transceiver and the antenna such that the low pass filter does not impede the transceiver's ability to tune the antenna, the filter configured to suppress harmonics and attenuate generated harmonics for the antenna to prevent inversion of impedance and to provide a symmetrical impedance load presented to the RF transceiver from the antenna. ### Claim 2 (depends on 1) The device of claim 1, wherein the RF transceiver is configured to operate in a 900 MHz band. ### Claim 3 (depends on 1) The device of claim 1, wherein the RF transceiver is configured to operate using antenna tuning circuitry. ### Claim 4 (depends on 1) The device of claim 1, wherein the antenna is a resonant loop antenna. ### Claim 5 (depends on 1) The device of claim 1, wherein the filter is implemented using low temperature co-fired ceramic (LTCC) technology. ### Claim 6 (depends on 1) The device of claim 1, wherein the filter is implemented using thin film technology. ### Claim 7 (depends on 1) The device of claim 1, wherein the hearing assistance device includes a cochlear implant. ### Claim 8 (depends on 1) The device of claim 1, wherein the hearing assistance device includes a hearing aid. ### Claim 9 (depends on 8) The device of claim 8, wherein the hearing aid includes an in-the-ear (ITE) hearing aid. ### Claim 10 (depends on 8) The device of claim 8, wherein the hearing aid includes a behind-the-ear (BTE) hearing aid. ### Claim 11 (depends on 8) The device of claim 8, wherein the hearing aid includes an in-the-canal (ITC) hearing aid. ### Claim 12 (depends on 8) The device of claim 8, wherein the hearing aid includes a receiver-in-canal (RIC) hearing aid. ### Claim 13 (depends on 8) The device of claim 8, wherein the hearing aid includes a completely-in-the-canal (CIC) hearing aid. ### Claim 14 (depends on 8) The device of claim 8, wherein the hearing aid includes a receiver-in-the-ear (RITE) hearing aid. ### Claim 15 A method, comprising: providing a balanced low pass filter connected between antenna match circuitry of an RF transceiver and an antenna of a hearing assistance device including a microphone and hearing assistance electronics connected to the microphone and the RF transceiver, the filter configured to suppress harmonics and attenuate generated harmonics for the antenna to prevent inversion of impedance and to provide a symmetrical impedance load presented to the RF transceiver from the antenna, wherein the filter does not impede the transceiver's ability to tune the antenna. ### Claim 16 (depends on 15) The method of claim 15, wherein providing a balanced low pass filter includes providing a balanced low pass filter using discrete LC technology. ### Claim 17 (depends on 15) The method of claim 15, wherein the RF transceiver is configured to operate in a 900 MHz band. ### Claim 18 (depends on 15) The method of claim 15, wherein the antenna is a resonant loop antenna. ### Claim 19 (depends on 15) The method of claim 15, wherein providing the filter includes using low temperature co-fired ceramic (LTCC) technology. ### Claim 20 (depends on 15) The method of claim 15, wherein providing the filter includes using thin film technology.