標題: 利用懸浮結構抑制微波帶通濾波器二階諧波之研究
Suppression of Spurious Resonance for Microstrip Bandpass Filters Via Substrate Suspension
作者: 江孟駿
Meng-Jiun Jiang
郭仁財
Jen-Tsai Kuo
電信工程研究所
關鍵字: 二階諧波;懸浮結構;Spurious Resonance;Substrate Suspension
公開日期: 2001
摘要: 將耦合微帶線率波器的基板(Substrate)懸空可以抑制在二倍頻( )所產生的虛假響應(spurious response) 或二次諧波,我們使用全波頻域法(Full-wave spectral domain approach, SDA) 分析懸空的耦合微帶線,當基板懸空在特定某一個高度時,耦合微帶線的奇模跟偶模的相位速度,在二倍頻處完全相同,可以抑制二次諧波的假響應。本文設計並實作了三個不同規格的濾波器,為降低製作成本,在每一個濾波器中,每一個耦合段的懸空高度都是一致的,量測結果顯示,這些濾波器的二倍頻假響應都有很好的抑制效果。
The spurious response of microstrip bandpass filter at twice the passband frequency (2fo) is suppressed via substrate suspension. The suspended coupled microstrip lines are analyzed by the full-wave spectral-domain approach (SDA). It is found that for each coupled section in a suspended bandpass filter, a specific height of substrate suspension can be obtained to equalize the phase velocities of the even-mode and odd-mode, so that the spurious response at 2fo can be completely suppressed. Three filters with uniform suspension height are designed and fabricated. The measured results show good rejection levels at 2fo.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT900435076
http://hdl.handle.net/11536/68953
Appears in Collections:Thesis