Wireless medical device with a complementary split ring resonator arrangement for suppression of electromagnetic interference

A medical fluid infusion device comprising:

• a housing;
• a radio frequency (RF) communication module to process RF signals associated with operation of the medical device, the RF signals having a nominal transmission frequency;
• an RF antenna associated with the RF communication module, the RF antenna integrally formed with the housing;
• a physically distinct microstrip transmission component coupled between the RF communication module and the RF antenna, the microstrip transmission component comprising:
• a dielectric substrate having an upper major surface and a lower major surface opposite the upper major surface;
• an electrically conductive signal trace formed overlying the upper major surface;
• and
• an electrically conductive ground plane formed overlying the lower major surface;
• and
• a complementary split ring resonator (CSRR) arrangement for the microstrip transmission component, the CSRR arrangement having a layout and dimensions tuned to cause the CSRR arrangement to suppress a harmonic frequency component of the nominal transmission frequency of the RF signals.

A medical device comprising:

• a housing;
• a radio frequency (RF) communication module to process RF signals associated with operation of the medical device, the RF signals having a nominal transmission frequency;
• an RF antenna associated with the RF communication module, the RF antenna integrally formed with the housing;
• a physically distinct microstrip transmission component coupled between the RF communication module and the RF antenna, the microstrip transmission component comprising:
• a dielectric substrate having an upper major surface and a lower major surface opposite the upper major surface;
• an electrically conductive signal trace formed on the upper major surface;
• and
• a layer of electrically conductive material formed on the lower major surface, the layer of electrically conductive material comprising voids formed therein to define a complementary split ring resonator (CSRR) arrangement having a layout and dimensions tuned to cause the CSRR arrangement to resonate at a harmonic frequency of the nominal transmission frequency.