低通道負載效應之多頻低通與帶通濾波器;Multi-channel low-pass and band-pass filters with low channel loading effects

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Title:	低通道負載效應之多頻低通與帶通濾波器;Multi-channel low-pass and band-pass filters with low channel loading effects
Authors:	王祖晴;Wang, Tsu Ching
Contributors:	電機工程學系
Keywords:	多頻帶濾波器;散佈式耦合
Date:	2021-09-23
Issue Date:	2021-12-07 13:18:59 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文之多頻帶濾波器之通帶由一低通濾波器以及傳統半波長共振器所組成，帶通濾波器的每個通帶皆由一對共振器控制來增加設計自由度，並且使用散佈式耦合技術減少頻帶間的負載效應，故不需要複雜的匹配電路來設計多頻帶的電路。其中，低通濾波器除了提供範圍0至2 GHz之通帶，也增加了多頻帶間的選擇度。第一個電路當中的低通濾波器由多個步階式阻抗共振器(Stepped-impedance resonator, SIR)以串聯方式連接，在通帶內的反射損耗從0 GHz至2 GHz皆大於20 dB，且有一個近似2 GHz的3-dB截止頻率為1.96 GHz，截止帶大於20 dB的範圍從 2.3 GHz 至6.72 GHz。第二個電路中的低通濾波器則由一段傳輸線與指叉式電容組合而成，再以此為一個單位，用傳輸線串聯兩個相似的結構；第三種低通濾波器則為以一段傳輸線並聯一個晶片電容為一單位的結構所組成的低通濾波器。第二個電路在通帶內的反射損耗從0 GHz至1.82 GHz皆大於20 dB，且3-dB截止頻率為2.14 GHz，截止帶大於20 dB的範圍從 2.53 GHz 至6.73 GHz。第三種低通濾波器的3-dB通帶從0 GHz 至 1.97 GHz，通帶內的反射損耗從0 GHz 至 1.77 GHz 皆大於15 dB，截止帶大於20 dB之範圍從2.3 GHz 至 6.68 GHz。最後第四種低通濾波器則為步階式阻抗低通濾波器，在通帶內的反射損耗從0 GHz至 1.77 GHz皆大於15 dB，且3-dB截止頻率為1.99 GHz，截止帶大於20 dB的範圍從 2.74 GHz 至9.3 GHz。 ;The multi-channel low-pass and band-pass filters consisting of low-pass filter and half-wavelength resonators. Each passband of BPFs is controlled by a respective pair of resonators to increase design freedom, and the four BPFs are combined by utilizing distributed coupling technique to reduce channel-to-channel loading effect. Due to the low loading effect from distributed coupling technique, the proposed circuits can obtain many channels without the need of complicated matching network. Furthermore, the low-pass filter not only provides a passband from 0 to 2 GHz, but also increases improve in-band selectivity among multiple frequency bands. The low-pass filter in the first circuit consisting of multiple cascaded stepped-impedance resonator (SIR), This low-pass filter has a 3-dB passband from dc to 1.96 GHz. The return loss is better than 20 dB from dc to 2 GHz ,and the rejection is better than 20 dB form 2.3 GHz to 6.72 GHz. The low-pass filter in the second circuit consisting of a transmission line and a interdigital capacitor, and make it as a unit, connected two units by transmission line. The third circuit consisting of a transmission line and a lumped capacitor for a unit, also connected two units by transmission line. The second circuit has a 3-dB passband from dc to 1.82 GHz. The return loss is better than 20 dB from dc to 2.14 GHz ,and the rejection is better than 20 dB form 2.53 GHz to 6.73 GHz. The third circuit has a 3-dB passband from dc to 1.97 GHz. The return loss is better than 15 dB from dc to 1.77 GHz ,and the rejection is better than 20 dB form 2.3 GHz to 6.68 GHz. In the end, the low-pass filter in the last circuit is a Stepped-impedance low-pass filter ,and it has a 3-dB passband from dc to 1.99 GHz. The return loss is better than 15 dB from dc to 1.77 GHz ,and the rejection is better than 20 dB form 2.74 GHz to 9.3 GHz.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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