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This paper presents a dual-resonant PIFA (Planar Inverted F-Antenna) for a wireless on-body breathing monitoring system utilizing Bluetooth. Gap-coupled, dual resonance structure is used to achieve a large band and robust operation in different environments. According to simulations, the antenna has a −10 dB impedance bandwidth of 210 MHz, and roughly 60 % radiation efficiency at the 2.4 GHz ISM band...
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