| Summary: | 碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 97 === A novel broadband antenna miniaturization is presented in this thesis. The antenna is proposed for operating at whole world DTV reception band (470 MHz ~ 860 MHz).
This antenna used the 50 Ω microstip line to feed, In microstip line’s ground plane slotting let microstip line return current path increase to radiation effect. To achieve broadband structure, the proposed antenna is composed of seven resonances path in the ground plane. To achieve compact structure, the proposed antenna is use signal line and ground plane coupling induce the capacitance effect. The impedance matching and bandwidth for the presented antenna are mainly affected by sheet metal on signal line. The antenna can get omnidirectional radiation pattern in the whole frequency band. The measurement result is agree with simulation.
In order to enhance receiver receiving performance for this antenna in DTV signal receptions, the LNA is used to increase the receiving signal power intensity. Finally, the LNA be fabricated and integrated in the ground plane to prove the receiver signal power intensity by practical measurement. The designed antenna with overall size of only 20 × 20 × 0.8 mm3, and combined the LNA overall size of only 20 × 30 × 0.8 mm3.
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