Radio frequency printed circuit antenna adapting to 50 ohms impedance includes an impedance control radiant element with an inductive element adjusting the resonance

摘要

The radio frequency printed circuit antenna adapting to 50 ohms impedance has 433 and 868 MHertz frequency bands and equipment dimensions below one the wavelength at the operating frequency. A curved 50 ohm impedance radiant element is e.g. one third the wavelength and an inductive element adjusting the resonance is in series with the radiant element.