| Summary: | 碩士 === 清雲科技大學 === 電機工程系所 === 97 === Merging coplanar waveguide, spiral, Hilbert curve and defected ground structure, the novel bandpass filter design is proposed in this thesis.
For Hilbert slot spiral resonator in DGS, the results with center frequency 1.90 GHz, low insertion loss -0.92 dB, higher out-of-band zero level -48.60 dB and wide band 23% are obtained. Frequency responses are dual-band for parallel line and cross line coupled structure. For Hilbert slot spiral resonator with parallel line, the results with center frequency 1.90 GHz / 3.98 GHz, low insertion loss -0.94 dB / -0.79 dB, higher out-of-band zero level -46.92 dB / -25.70 dB and wide band 24% / 13% are obtained. The filter can achieve for GSM(1.8 GHz) and PHS(1.9 GHz) applications. For Hilbert slot spiral resonator with cross line, the performance of center frequency 2.36 GHz / 6.17 GHz, lower insertion loss -0.81 dB / -0.87 dB, high out-of-band zero level -42.74 dB / -42.74 dB and wider band filters 22.8% /36.3% are achieved. The filter can be used for WLAN 802.11a/b (5 GHz / 2.4 GHz) and Bluetooth (2.4 GHz) applications.
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