| Summary: | 碩士 === 國立成功大學 === 電機工程學系 === 104 === In our thesis, we designed a object identification system by detecting the harmonic power wich our operated frequency is 915 MHz. The whole construction is including a dual-band Yagi- Uda antenna, Arduino microcontroller, RF-DC rectifier. We also had tape out a power transmission circuit chip which include a voltage controlled oscillator (VCO) and a Class-E preamp for emulating an RF power source.
From the measurement results of object identification system, the proposed S11 of dual-band Yagi-Uda antenna are -16.438 dB and -17.385 dB at 915 MHz and 1830 MHz. The RF-DC rectifier can export an output voltage of 0.09 V to 1.31 V DC voltage from 0 dBm to 14 dBm as RF power source. The whole object identification system can get the increment voltage more than 0.17 V to identify the existence of object.
The total chip area including VCO and Class-E preamp is 2.89 mm2. As for the VCO, the output power is 1.175 dBm at 915 MHz, turing range is 231 MHz, the power consumption is 5.49 mW and the phase noise is -119.22 dBc/Hz at 1MHz frequency offset. The output power of whole chip design (VCO+Class-E preamp) is 1.91 dBm and total power consumption is 87.21 mW.
|
|---|
