| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 103 === In this thesis, the antennas to be applied in an ultra-wideband indoor human breathing and heartbeat sensor are proposed. In consideration of the application environments, antenna characteristics must have wide bandwidth, high gain,good radiation efficiency and directional radiation patterns. Also, since the ultra-wideband wireless communication system transmits pulse signals, the group delay of the antennas needs to be evaluated to avoid signal transmission distortions.
First, an ultra-wideband three-dimensional coupled antenna is proposed.Coupling effects between monopole antenna and parasitic elements are used to obtain wide operating bandwidth.Also, three-dimensional antenna architecture with air between the elements is applied to have good antenna radiation efficiency.Besides,a ground behind the antenna further enhances the antenna gain and achieve directional radiation patterns.
Secondly,a bow-tie 2 × 1 array antenna is proposed for cost effective solution. The broadband bow-tie dipole antenna and T-type power divider are designed to obtain good impedance matching, gain and radiated efficiency in the operating frequency band.Also, a metal reflector behind the antenna is used to obtain the higher gain and directional patterns.
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