| Summary: | 碩士 === 崑山科技大學 === 電腦與通訊研究所 === 101 === Three types of novel bandpass filter are presented in this study. The first type is new ultra-wideband (UWB) bandpass filter using triangle-ring multi-mode stub-loaded resonator. The filter consists of a triangle ring multi-mode resonator with stub-loaded resonator for controlling the two transmission zeros at 2.8 / 11 GHz and the asymmetric tight coupled input/output (I/O) lines. There are five resonant modes generated in the UWB passband including two odd modes and three even modes. The two transmission zeros generated by the triangle-ring MM-SLR can effectively improve the passband edge selectivity.
The second type is a new ultra-wideband (UWB) bandpass filter (BPF) with sharp roll-off and dual-notched bands. The filter consists of a triangle ring multi-mode resonator (MMR) with the stub-loaded resonator (SLR) for controlling the two transmission zeros at 2.8 / 11 GHz, the embedded open-circuited stub and the asymmetric tight coupled input/output (I/O) lines for introducing the dual notched bands at 5.2 / 6.8 GHz.
Finally, a new multilayered triple-passband bandpass filter (BPF) using embedded and stub-loaded stepped impedance resonators (SIRs) is proposed. The filter is designed to have triple-passband at 1.8, 2.4 and 3.5 GHz. The 1st and 2nd passband (1.8 / 2.4 GHz) are simultaneously generated by controlling the impedance and length ratios of the embedded SIRs (on top layer). The 3rd passband (3.5 GHz) is generated by using the stub-loaded SIR (on bottom layer). By using the embedded SIR, the even modes can be tuned within very wide frequency range and without affecting the odd modes.
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