On-Chip Single-to-Balanced Multicoupled Line Bandpass Filters With Good Selectivity

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题名:	On-Chip Single-to-Balanced Multicoupled Line Bandpass Filters With Good Selectivity
作者:	Lin,YS;You,CW;Tsai,CL
贡献者:	電機工程學系
关键词:	DESIGN
日期:	2011
上传时间:	2012-03-28 10:15:09 (UTC+8)
出版者:	國立中央大學
摘要:	In this work, on-chip single-to-balanced bandpass filters with good selectivity are proposed. The functions of bandpass filter and balun are integrated using a simple multicoupled line structure along with capacitive loadings. The use of inductor is avoided such that the proposed single-to-balanced bandpass filters can achieve very compact size when implemented on chip. They can be designed with the desired bandpass response and reference impedances through the proposed equivalent-circuit models and design equations. In addition, by introducing two cross-coupled capacitors, one tunable transmission zero can be achieved in either the lower or upper stopband to improve the selectivity. Specifically, two third-order single-to-balanced bandpass filter designs in commercial pHEMT process on 4-mil GaAs substrate with different transmission zero locations are presented. The circuit size is less than 1.02 mm x 0.86 mm for a center frequency of 5.5 GHz and a bandwidth of about 18.18%. The corresponding electrical size is only 0.054 lambda(g) x 0.045 lambda(g) at the center frequency. Good selectivity and balanced performance are demonstrated.
關聯:	IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
显示于类别:	[電機工程學系] 期刊論文

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