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This paper shows channel models on path loss and power delay profile for wireless body area networks. These models were derived from measured channel transfer functions by using a vector network analyzer. The path loss models were obtained for the frequency bands of 430, 611, 953, 2450 MHz, and UWB band. A power delay profile model was given only for the UWB band because typical symbol duration of...
In this paper, we evaluated the transmission gain of ultra wideband radio by using the Friispsila transmission formula. However, it is not directly applicable to ultra wideband impulse radio (UWB-IR) transmission systems. This paper presents the link budget evaluation formula in the term of transmission gain for the UWB-IR systems that takes into account the transmitted waveform, its distortion due...
In free space propagation loss is usually evaluated by using the Friis' transmission formula. However, it is not directly applicable to ultra wideband impulse radio (UWB-IR) transmission systems. This paper presents the link budget evaluation formula for UWB-IR systems that takes into account the transmission signal waveform, its distortion due to the antenna, and the receiver. Since the antennas...
In this paper, a small chip UWB antenna loaded with PPS resin mixed with metal powder was developed. The metal powder is mixed with PPS to increase the permittivity of the element. The size of the dielectric chip element is 7.4 mm X 10.1 mm X 0.94 mm, on the FR-4 substrate of the size 20 mm X 42 mm X 0.5 mm. The VSWR of the antenna is lower than 2.0 for 3.0-5.0 GHz. The frequency characteristics of...
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